Stonehendge :: Architecture History Art Essays

Stonehendge When you think of Stonehenge, you think of the Ancient Druid Civilization that supposedly built it, this is in fact not true. In this essay, I will show you the building of one of the most amazing art forms in history, as well as give some insight on legend. Certainly the best known of all megalithic sites, Stonehenge stands in isolation on the undulating chalk of Salisbury Plain, west of Amesbury, between the busy A303 and A344 roads. At first sight, this unique and enigmatic site appears smaller than imagined, but the tallest upright stone is 6.7m (22ft) high, with another 2.4m (8ft) below ground. The outermost element of the site is the Avenue that runs straight down a gentle slope for 530m (560yds) into Stonehenge Bottom. The Avenue consists of twin banks about 12m (40ft) apart with internal ditches, and it begins at the entrance to the earthwork enclosure. Here is the Heel Stone, a large upright unworked sarsen (hard sandstone) that lies immediately adjacent to the A344 road. It is worth noting that the nearest source of stones of the size represented by the large sarsens at Stonehenge is on the Marlborough Downs, about 30km (18mi) to the NE. One may only imagine how these stones had been moved; it only seems logical that these stones (the heaviest of which weighs about 45 tons) were transported on some type of sledge. Moving inwards from the Heel Stone is an earthwork enclosure that consists of a ditch and an interior bank, the height of which was calculated by Professor Atkinson as being about 1.8m (6ft). It is known that there were at least two entrances, the one now visible (facing NE) and one to the south. Lying within the entrance is an unworked and now recumbent sarsen stone, stained a rusty red caused by rainwater acting on iron, and known as the Slaughter Stone. Arranged around the inner edge of the earthwork bank were originally four small uprights: the Station Stones, of which two are still visible. Immediately adjacent to the bank is a ring of 56 pits, known as the Aubrey Holes, marked by circular concrete spots. The area between the inner edge of the bank and the outermost stone settings includes at least two further settings of pits: the Y and Z holes. On the central area of the site, there are the stone settings, the sophisticated arrangements that set Stonehenge apart from any other prehistoric monument in Europe.

Lupain Ng Taglamig

DETERGENT PESTICIDE DISINFFECTANT PRESERVATIVES ADDITIVES MEDICINES BLEACH PETROLEUM JELLY ALUMINUM FOIL CORN STARCH NAME. ROMELYN. VILLAMAYOR YR&SEC; IV-EDISON TEACHER; MRS. SALUDES NAME:ERICA E. VILLAMAYOR GR&SEC: VI-MALINIS TEACHER:MR:PENIDA A  detergent  is a  surfactant  or a mixture of surfactants with â€Å"cleaning properties in dilute solutions. â€Å"[1]  These substances are usually alkylbenzenesulfonates, a family of compounds that are similar to  soap  but are more soluble in  hard water, because the polar sulfonate (of detergents) is less likely than the polar carboxyl (of soap) to bind to calcium and other ions found in hard water.In most household contexts, the term  detergent  by itself refers specifically to  laundry detergent  or  dish detergent, as opposed to  hand soapor other types of cleaning agents. Detergents are commonly available as powders or concentrated solutions. Detergents, like soaps, work because they are  amph iphilic: partlyhydrophilic  (polar) and partly  hydrophobic  (non-polar). Their dual nature facilitates the mixture of hydrophobic compounds (like oil and grease) with water. Because air is not hydrophilic, detergents are also  foaming agents  to varying degrees.Pesticides  are substances or mixture of substances intended for preventing, destroying, repelling or mitigating any  pest. [1]  Pesticides are a special kind of products for crop protection. Crop protection products in general protect plants from damaging influences such as weeds, diseases or insects. A pesticide is generally a  chemical  or biological agent (such as a  virus,  bacterium,  antimicrobial  or  disinfectant) that through its effect deters, incapacitates, kills or otherwise discourages pests.Target pests can includeinsects, plant  pathogens, weeds,  molluscs,  birds,  mammals,  fish, nematodes (roundworms), and  microbes  that destroy property, cause nuisance, spread disease or are  vectors  for disease. Disinfectants  are substances that are applied to non-living objects to destroy  microorganismsthat are living on the objects. [1]  Disinfection does not necessarily kill all microorganisms, especially resistant  bacterial spores; it is less effective than  sterilisation, which is an extreme physical and/or chemical process that kills all types of life. 1]  Disinfectants are different from other  antimicrobial agents  such as  antibiotics, which destroy microorganisms within the body, and  antiseptics, which destroy microorganisms on living  tissue.Disinfectants are also different from  biocides  Ã¢â‚¬â€ the latter are intended to destroy all forms of life, not just microorganisms. Disinfectants work by destroying the cell wall of microbes or interfering with the metabolism. A  preservative  is a naturally occurring or synthetically produced substance that is added to products such as foods,pharmaceuticals, pai nts, biological samples, wood, etc. o prevent  decomposition  by  microbial  growth or by undesirable  chemicalchanges. Food additives  are substances added to food to preserve flavor or enhance its taste and appearance. Some additives have been used for centuries; for example, preserving food by  pickling  (with  vinegar),  salting, as with  bacon, preserving  sweets  or using  sulfur dioxide  as in some  wines. With the advent of processed foods in the second half of the 20th century, many more additives have been introduced, of both natural and artificial origin.Medicine  is the  applied science  or practice of the  diagnosis,  treatment, and prevention ofdisease. [1]  It encompasses a variety of  health care  practices evolved to maintain and restore  health  by the  prevention  and  treatment  of  illness  in  human beings. Contemporary medicine applies  health science,  biomedical research, and  medical te chnology  to  diagnose  and treat injury and disease, typically through  medication  orsurgery, but also through therapies as diverse as  psychotherapy,  external splints & traction,  prostheses,  biologics,  ionizing radiation  and others.Bleach  has been serialized in the Japanese manga anthology  Weekly Shonen JumpsincAugust 2001, and has been collected into 56  tankobon  volumes as of September 2012. Since its publication,  Bleach  has spawned a  media franchise  that includes ananimated  television series  that was produced by  Studio Pierrot  in Japan from 2004 to 2012, two  original video animations, four animated feature films, seven  rock musicals, and  numerous video games, as well as many types of  Bleach-related  merchandise.Petroleum jelly,  petrolatum,  white petrolatum  or  soft paraffin,  CAS number  8009-03-8, is a  semi-solid  mixture of  hydrocarbons  (with  carbon  numbers mainly higher than 25),[1]  originally promoted as a topical  ointment  for its healing properties. Its folkloric medicinal value as a â€Å"cure-all† has since been limited by better scientific understanding of appropriate and inappropriate uses (see  uses  below). However, it is recognized by the U. S. Food and Drug Administration  (FDA) as an approved  over-the-counter  (OTC)  skin  protectant, and remains widely used in  cosmetic  skin care.Aluminium foil  is  aluminium  prepared in thin  metal leaves, with a thickness less than 0. 2 millimetres (8  mils), thinner gauges down to 6  Ã‚ µm (0. 2  mils) are also commonly used. [1]  In the USA, foils are commonly gauged in  mils. Standard household foil is typically 0. 016 millimetres (0. 6  mils) thick and heavy duty household foil is typically 0. 024 millimetres (0. 9  mils). The  foil  is pliable, and can be readily bent or wrapped around objects. Thin foils are fragile and are so metimes  laminated  to other materials such asplastics  or  paper  to make them more useful.Aluminium foilsupplanted  tin foil  in the mid 20th century. Corn starch is used as a  thickening agent  in  soups  and liquid-based foods, such assauces,  gravies  and  custards  by mixing it with a cold liquid to form a paste or slurry. It is sometimes preferred over  flour  because it forms a  translucent  mixture, rather than anopaque  one. As the starch is heated, the molecular chains unravel, allowing them to collide with other starch chains to form a mesh, thickening the liquid (Starch gelatinization). Lupain Ng Taglamig Reaction Paper Ric Michael P. De Vera IV- Rizal Mr. Norie Sabayan I. A and B Arabic mathematics: forgotten brilliance? Indian  mathematics  reached Baghdad, a major early center of Islam, about ad 800. Supported by the ruling caliphs and wealthy individuals, translators in Baghdad produced Arabic versions of Greek and Indian mathematical works. The need for translations was stimulated by mathematical research in the Islamic world. Islamic mathematics also served religion in that it proved useful in dividing inheritances according to Islamic law; in predicting the time of the new moon, when the next month began; and in determining the direction to Mecca for the orientation of mosques and of daily prayers, which were delivered facing Mecca. Recent research paints a new picture of the debt that we owe to Arabic/Islamic mathematics. Certainly many of the ideas which were previously thought to have been brilliant new conceptions due to European mathematicians of the sixteenth, seventeenth and eighteenth centuries are now known to have been developed by Arabic/Islamic mathematicians around four centuries earlier. In many respects the mathematics studied today is far closer in style to that of the Arabic/Islamic contribution than to that of the Greeks. There is a widely held view that, after a brilliant period for mathematics when the Greeks laid the foundations for modern mathematics, there was a period of stagnation before the Europeans took over where the Greeks left off at the beginning of the sixteenth century. The common perception of the period of 1000 years or so between the ancient Greeks and the European Renaissance is that little happened in the world of mathematics except that some Arabic translations of Greek texts were made which preserved the Greek learning so that it was available to the Europeans at the beginning of the sixteenth century. That such views should be generally held is of no surprise. Many leading historians of mathematics have contributed to the perception by either omitting any mention of Arabic/Islamic mathematics in the historical development of the subject or with statements such as that made by Duhem in :- †¦ Arabic science only reproduced the teachings received from Greek science. Before we proceed it is worth trying to define the period that this article covers and give an overall description to cover the mathematicians who contributed. The period we cover is easy to describe: it stretches from the end of the eighth century to about the middle of the fifteenth century. Giving a description to cover the mathematicians who contributed, however, is much harder. The works and are on â€Å"Islamic mathematics†, similar to which uses the title the â€Å"Muslim contribution to mathematics†. Other authors try the description â€Å"Arabic mathematics†. However, certainly not all the mathematicians we wish to include were Muslims; some were Jews, some Christians, some of other faiths. Nor were all these mathematicians Arabs, but for convenience we will call our topic â€Å"Arab mathematics†. We should emphasize that the translations into Arabic at this time were made by scientists and mathematicians such as those named above, not by language experts ignorant of mathematics, and the need for the translations was stimulated by the most advanced research of the time. It is important to realize that the translating was not done for its own sake, but was done as part of the current research effort. Of Euclid's works, the Elements, the Data, the Optics, the Phaenomena, and On Divisions were translated. Of Archimedes' works only two – Sphere and Cylinder and Measurement of the Circle – are known to have been translated, but these were sufficient to stimulate independent researches from the 9th to the 15th century. On the other hand, virtually all of Apollonius's works were translated, and of Diophantus and Menelaus one book each, the Arithmetica and the Sphaerica, respectively, were translated into Arabic. Finally, the translation of Ptolemy's Almagest furnished important astronomical material. †¦ Diocles' treatise on mirrors, Theodosius's Spherics, Pappus's work on mechanics, Ptolemy's Planisphaerium, and Hypsicles' treatises on regular polyhedra (the so-called Books XIV and XV of Euclid's Elements) †¦ Perhaps one of the most significant advances made by Arabic mathematics began at this time with the work of al-Khwarizmi, namely the beginnings of algebra. It is important to understand just how significant this new idea was. It was a revolutionary ove away from the Greek concept of mathematics which was essentially geometry. Algebra was a unifying theory which allowed rational numbers, irrational numbers, geometrical magnitudes, etc. , to all is treated as â€Å"algebraic objects†. It gave mathematics a whole new development path so much broader in concept to that which had existed before, and provided a vehicle for future development of the subject. Another important aspect of the introduction of algebraic ideas was that it allowed mathematics to be applied to itself in a way which had not happened before. Al-Khwarizmi's successors undertook a systematic application of arithmetic to algebra, algebra to arithmetic, both to trigonometry, algebra to the Euclidean theory of numbers, algebra to geometry, and geometry to algebra. This was how the creation of polynomial algebra, combinatorial analysis, and numerical analysis, the numerical solution of equations, the new elementary theory of numbers, and the geometric construction of equations arose. Let us follow the development of algebra for a moment and look at al-Khwarizmi's successors. About forty years after al-Khwarizmi is the work of al-Mahani (born 820), who conceived the idea of reducing geometrical problems such as duplicating the cube to problems in algebra. Abu Kamil (born 850) forms an important link in the development of algebra between al-Khwarizmi and al-Karaji. Despite not using symbols, but writing powers of x in words, he had begun to understand what we would write in symbols as xn. xm = xm+n. Let us remark that symbols did not appear in Arabic mathematics until much later. Ibn al-Banna and al-Qalasadi used symbols in the 15th century and, although we do not know exactly when their use began, we know that symbols were used at least a century before this. Al-Karaji (born 953) is seen by many as the first person to completely free algebra from geometrical operations and to replace them with the arithmetical type of operations which are at the core of algebra today. He was first to define the monomials x, x2, x3, †¦ and 1/x, 1/x2, 1/x3, †¦ and to give rules for products of any two of these. He started a school of algebra which flourished for several hundreds of years. Al-Samawal, nearly 200 years later, was an important member of al-Karaji's school. Al-Samawal (born 1130) was the first to give the new topic of algebra a precise description when he wrote that it was concerned:- †¦ with operating on unknowns using all the arithmetical tools, in the same way as the arithmetician operates on the known. Omar Khayyam (born 1048) gave a complete classification of cubic equations with geometric solutions found by means of intersecting conic sections. Khayyam also wrote that he hoped to give a full description of the algebraic solution of cubic equations in a later work . If the opportunity arises and I can succeed, I shall give all these fourteen forms with all their branches and cases, and how to distinguish whatever is possible or impossible so that a paper, containing elements which are greatly useful in this art will be prepared. Sharaf al-Din al-Tusi (born 1135), although almost exactly the same age as al-Samawal, does not follow the general development that came through al-Karaji's school of algebra but rather follows Khayyam's application of algebra to geometry. He wrote a treatise on cubic equations. .. represents an essential contribution to another algebra which aimed to study curves by means of equations, thus inaugurating the beginning of algebraic geometry. Let us give other examples of the development of Arabic mathematics. Returning to the House of Wisdom in Baghdad in the 9th century, one mathematician who was educated there by the Banu Musa brothers was Thabit ibn Qurra (born 836). He made many contributions to mathematics, but let u s consider for the moment consider his contributions to number theory. He discovered a beautiful theorem which allowed pairs of amicable numbers to be found, that is two numbers such that each is the sum of the proper divisors of the other. Al-Baghdadi (born 980) looked at a slight variant of Thabit ibn Qurra's theorem, while al-Haytham (born 965) seems to have been the first to attempt to classify all even perfect numbers (numbers equal to the sum of their proper divisors) as those of the form 2k-1(2k – 1) where 2k – 1 is prime. Al-Haytham, is also the first person that we know to state Wilson's theorem, namely that if p is prime then 1+ (p-1)! is divisible by p. It is unclear whether he knew how to prove this result. It is called Wilson's theorem because of a comment made by Waring in 1770 that John Wilson had noticed the result. There is no evidence that John Wilson knew how to prove it and most certainly Waring did not. Lagrange gave the first proof in 1771 and it should be noticed that it is more than 750 years after al-Haytham before number theory surpasses this achievement of Arabic mathematics. Continuing the story of amicable numbers, from which we have taken a diversion, it is worth noting that they play a large role in Arabic mathematics. Al-Farisi (born 1260) gave a new proof of Thabit ibn Qurra's theorem, introducing important new ideas concerning factorisation and combinatorial methods. He also gave the pair of amicable numbers 17296, 18416 which have been attributed to Euler, but we know that these were known earlier than al-Farisi, perhaps even by Thabit ibn Qurra himself. Although outside our time range for Arabic mathematics in this article, it is worth noting that in the 17th century the Arabic mathematician Mohammed Baqir Yazdi gave the pair of amicable number 9,363,584 and 9,437,056 still many years before Euler's contribution. C. Arabian Mathematics/ Islamic Mathematics In  the  9th  century  Arab mathematician al-Khwarizmi wrote a systematic introduction to algebra, Kitab al-jabr w’al Muqabalah (Book of Restoring and Balancing). The English word algebra comes from al-jabr in the treatise’s title. Al-Khwarizmi’s algebra was founded on Brahmagupta’s work, which he duly credited, and showed the influence of Babylonian and Greek mathematics as well. A 12th-century Latin translation of al-Khwarizmi’s treatise was crucial for the later development of algebra in Europe. Al-Khwarizmi’s name is the source of the word algorithm. By  the  year  900  the  acquisition of past mathematics was complete, and Muslim scholars began to build on what they had acquired. Alhazen, an outstanding Arab scientist of the late 900s and early 1000s, produced algebraic solutions of quadratic and cubic equations. Al-Karaji in the 10th and early 11th century completed the algebra of polynomials (mathematical expressions that are the sum of a number of terms) of al-Khwarizmi. He included polynomials with an infinite number of terms. Later  scholars,  including 12th-century Persian mathematician Omar Khayyam, solved certain cubic equations geometrically by using conic sections. Arab astronomers contributed the tangent and cotangent to trigonometry. Geometers such as Ibrahim ibn Sinan in the 10th century continued Archimedes’s investigations of areas and volumes, and Kamal al-Din and others applied the theory of conic sections to solve problems in optics. Astronomer Nasir al-Din al-Tusi created the mathematical disciplines of plane and spherical trigonometry in the 13th century and was the first to treat trigonometry separately from astronomy. Finally, a number of Muslim mathematicians made important discoveries in the theory of numbers, while others explained a ariety of numerical methods for solving equations. Many  of  the  ancient  Greek works on mathematics were preserved during the middle Ages through Arabic translations and commentaries. Europe acquired much of this learning during the 12th century, when Greek and Arabic works were translated into Latin, then the written language of educated Europeans. These Arabic works, together with the Greek classics, were responsible for the growth of mathematics in the West during the late middle Ages. Microsoft  ® Encarta  ® 2009.  © 1993-2008 Microsoft Corporation. All rights reserved. D. Origin of the Word Algebra The word algebra is a Latin variant of the Arabic word al-jabr. This came from the title of a book, Hidab al-jabr wal-muqubala, written in Baghdad about 825 A. D. by the Arab mathematician Mohammed ibn-Musa al-Khowarizmi. The words jabr (JAH-ber) and muqubalah (moo-KAH-ba-lah) were used by al-Khowarizmi to designate two basic operations in solving equations. Jabr was to transpose subtracted terms to the other side of the equation. Muqubalah was to cancel like terms on opposite sides of the equation. In fact, the title has been translated to mean â€Å"science of restoration (or reunion) and opposition† or â€Å"science of transposition and cancellation† and â€Å"The Book of Completion and Cancellation† or â€Å"The Book of Restoration and Balancing. † Jabr is used in the step where x – 2 = 12 becomes x = 14. The left-side of the first equation, where x is lessened by 2, is â€Å"restored† or â€Å"completed† back to x in the second equation. Muqabalah takes us from x + y = y + 7 to x = 7 by â€Å"cancelling† or â€Å"balancing† the two sides of the equation. Eventually the muqabalah was left behind, and this type of math became known as algebra in many languages. It is interesting to note that the word al-jabr used non-mathematically made its way into Europe through the Moors of Spain. There an algebrista is a bonesetter, or â€Å"restorer† of bones. A barber of medieval times called himself an algebrista since barbers often did bone-setting and bloodletting on the side. Hence the red and white striped barber poles of today. II. Insights The Arabian contributions to Mathematics are much used around the world. Their Mathematics shows a perfect way to represent numbers and problems, in a way to make it clearer and easier to understand. They have discovered many things about mathematics and formulated many formulas that are widely used today. I learned from this research that Arabs mathematics started when Indian mathematics reached Baghdad and translated it into Arabic. They improved and studied Mathematics and formulated many things. They become more famous when they discovered Algebra and improved it. Many Arabian mathematicians became famous because of their contributions on Mathematics. Many ancient Greeks works on mathematics were preserved through Arabic translations and commentaries. I am enlightened about the origin of what are we studying now in Mathematics. Now I know that majority of our lessons in mathematics came from Arabians not from Greeks. I also learned that many mathematicians contributed on different branches and techniques on mathematics and it take so much time for them to explore and improve mathematics. Lupain Ng Taglamig Reaction Paper Ric Michael P. De Vera IV- Rizal Mr. Norie Sabayan I. A and B Arabic mathematics: forgotten brilliance? Indian  mathematics  reached Baghdad, a major early center of Islam, about ad 800. Supported by the ruling caliphs and wealthy individuals, translators in Baghdad produced Arabic versions of Greek and Indian mathematical works. The need for translations was stimulated by mathematical research in the Islamic world. Islamic mathematics also served religion in that it proved useful in dividing inheritances according to Islamic law; in predicting the time of the new moon, when the next month began; and in determining the direction to Mecca for the orientation of mosques and of daily prayers, which were delivered facing Mecca. Recent research paints a new picture of the debt that we owe to Arabic/Islamic mathematics. Certainly many of the ideas which were previously thought to have been brilliant new conceptions due to European mathematicians of the sixteenth, seventeenth and eighteenth centuries are now known to have been developed by Arabic/Islamic mathematicians around four centuries earlier. In many respects the mathematics studied today is far closer in style to that of the Arabic/Islamic contribution than to that of the Greeks. There is a widely held view that, after a brilliant period for mathematics when the Greeks laid the foundations for modern mathematics, there was a period of stagnation before the Europeans took over where the Greeks left off at the beginning of the sixteenth century. The common perception of the period of 1000 years or so between the ancient Greeks and the European Renaissance is that little happened in the world of mathematics except that some Arabic translations of Greek texts were made which preserved the Greek learning so that it was available to the Europeans at the beginning of the sixteenth century. That such views should be generally held is of no surprise. Many leading historians of mathematics have contributed to the perception by either omitting any mention of Arabic/Islamic mathematics in the historical development of the subject or with statements such as that made by Duhem in :- †¦ Arabic science only reproduced the teachings received from Greek science. Before we proceed it is worth trying to define the period that this article covers and give an overall description to cover the mathematicians who contributed. The period we cover is easy to describe: it stretches from the end of the eighth century to about the middle of the fifteenth century. Giving a description to cover the mathematicians who contributed, however, is much harder. The works and are on â€Å"Islamic mathematics†, similar to which uses the title the â€Å"Muslim contribution to mathematics†. Other authors try the description â€Å"Arabic mathematics†. However, certainly not all the mathematicians we wish to include were Muslims; some were Jews, some Christians, some of other faiths. Nor were all these mathematicians Arabs, but for convenience we will call our topic â€Å"Arab mathematics†. We should emphasize that the translations into Arabic at this time were made by scientists and mathematicians such as those named above, not by language experts ignorant of mathematics, and the need for the translations was stimulated by the most advanced research of the time. It is important to realize that the translating was not done for its own sake, but was done as part of the current research effort. Of Euclid's works, the Elements, the Data, the Optics, the Phaenomena, and On Divisions were translated. Of Archimedes' works only two – Sphere and Cylinder and Measurement of the Circle – are known to have been translated, but these were sufficient to stimulate independent researches from the 9th to the 15th century. On the other hand, virtually all of Apollonius's works were translated, and of Diophantus and Menelaus one book each, the Arithmetica and the Sphaerica, respectively, were translated into Arabic. Finally, the translation of Ptolemy's Almagest furnished important astronomical material. †¦ Diocles' treatise on mirrors, Theodosius's Spherics, Pappus's work on mechanics, Ptolemy's Planisphaerium, and Hypsicles' treatises on regular polyhedra (the so-called Books XIV and XV of Euclid's Elements) †¦ Perhaps one of the most significant advances made by Arabic mathematics began at this time with the work of al-Khwarizmi, namely the beginnings of algebra. It is important to understand just how significant this new idea was. It was a revolutionary ove away from the Greek concept of mathematics which was essentially geometry. Algebra was a unifying theory which allowed rational numbers, irrational numbers, geometrical magnitudes, etc. , to all is treated as â€Å"algebraic objects†. It gave mathematics a whole new development path so much broader in concept to that which had existed before, and provided a vehicle for future development of the subject. Another important aspect of the introduction of algebraic ideas was that it allowed mathematics to be applied to itself in a way which had not happened before. Al-Khwarizmi's successors undertook a systematic application of arithmetic to algebra, algebra to arithmetic, both to trigonometry, algebra to the Euclidean theory of numbers, algebra to geometry, and geometry to algebra. This was how the creation of polynomial algebra, combinatorial analysis, and numerical analysis, the numerical solution of equations, the new elementary theory of numbers, and the geometric construction of equations arose. Let us follow the development of algebra for a moment and look at al-Khwarizmi's successors. About forty years after al-Khwarizmi is the work of al-Mahani (born 820), who conceived the idea of reducing geometrical problems such as duplicating the cube to problems in algebra. Abu Kamil (born 850) forms an important link in the development of algebra between al-Khwarizmi and al-Karaji. Despite not using symbols, but writing powers of x in words, he had begun to understand what we would write in symbols as xn. xm = xm+n. Let us remark that symbols did not appear in Arabic mathematics until much later. Ibn al-Banna and al-Qalasadi used symbols in the 15th century and, although we do not know exactly when their use began, we know that symbols were used at least a century before this. Al-Karaji (born 953) is seen by many as the first person to completely free algebra from geometrical operations and to replace them with the arithmetical type of operations which are at the core of algebra today. He was first to define the monomials x, x2, x3, †¦ and 1/x, 1/x2, 1/x3, †¦ and to give rules for products of any two of these. He started a school of algebra which flourished for several hundreds of years. Al-Samawal, nearly 200 years later, was an important member of al-Karaji's school. Al-Samawal (born 1130) was the first to give the new topic of algebra a precise description when he wrote that it was concerned:- †¦ with operating on unknowns using all the arithmetical tools, in the same way as the arithmetician operates on the known. Omar Khayyam (born 1048) gave a complete classification of cubic equations with geometric solutions found by means of intersecting conic sections. Khayyam also wrote that he hoped to give a full description of the algebraic solution of cubic equations in a later work . If the opportunity arises and I can succeed, I shall give all these fourteen forms with all their branches and cases, and how to distinguish whatever is possible or impossible so that a paper, containing elements which are greatly useful in this art will be prepared. Sharaf al-Din al-Tusi (born 1135), although almost exactly the same age as al-Samawal, does not follow the general development that came through al-Karaji's school of algebra but rather follows Khayyam's application of algebra to geometry. He wrote a treatise on cubic equations. .. represents an essential contribution to another algebra which aimed to study curves by means of equations, thus inaugurating the beginning of algebraic geometry. Let us give other examples of the development of Arabic mathematics. Returning to the House of Wisdom in Baghdad in the 9th century, one mathematician who was educated there by the Banu Musa brothers was Thabit ibn Qurra (born 836). He made many contributions to mathematics, but let u s consider for the moment consider his contributions to number theory. He discovered a beautiful theorem which allowed pairs of amicable numbers to be found, that is two numbers such that each is the sum of the proper divisors of the other. Al-Baghdadi (born 980) looked at a slight variant of Thabit ibn Qurra's theorem, while al-Haytham (born 965) seems to have been the first to attempt to classify all even perfect numbers (numbers equal to the sum of their proper divisors) as those of the form 2k-1(2k – 1) where 2k – 1 is prime. Al-Haytham, is also the first person that we know to state Wilson's theorem, namely that if p is prime then 1+ (p-1)! is divisible by p. It is unclear whether he knew how to prove this result. It is called Wilson's theorem because of a comment made by Waring in 1770 that John Wilson had noticed the result. There is no evidence that John Wilson knew how to prove it and most certainly Waring did not. Lagrange gave the first proof in 1771 and it should be noticed that it is more than 750 years after al-Haytham before number theory surpasses this achievement of Arabic mathematics. Continuing the story of amicable numbers, from which we have taken a diversion, it is worth noting that they play a large role in Arabic mathematics. Al-Farisi (born 1260) gave a new proof of Thabit ibn Qurra's theorem, introducing important new ideas concerning factorisation and combinatorial methods. He also gave the pair of amicable numbers 17296, 18416 which have been attributed to Euler, but we know that these were known earlier than al-Farisi, perhaps even by Thabit ibn Qurra himself. Although outside our time range for Arabic mathematics in this article, it is worth noting that in the 17th century the Arabic mathematician Mohammed Baqir Yazdi gave the pair of amicable number 9,363,584 and 9,437,056 still many years before Euler's contribution. C. Arabian Mathematics/ Islamic Mathematics In  the  9th  century  Arab mathematician al-Khwarizmi wrote a systematic introduction to algebra, Kitab al-jabr w’al Muqabalah (Book of Restoring and Balancing). The English word algebra comes from al-jabr in the treatise’s title. Al-Khwarizmi’s algebra was founded on Brahmagupta’s work, which he duly credited, and showed the influence of Babylonian and Greek mathematics as well. A 12th-century Latin translation of al-Khwarizmi’s treatise was crucial for the later development of algebra in Europe. Al-Khwarizmi’s name is the source of the word algorithm. By  the  year  900  the  acquisition of past mathematics was complete, and Muslim scholars began to build on what they had acquired. Alhazen, an outstanding Arab scientist of the late 900s and early 1000s, produced algebraic solutions of quadratic and cubic equations. Al-Karaji in the 10th and early 11th century completed the algebra of polynomials (mathematical expressions that are the sum of a number of terms) of al-Khwarizmi. He included polynomials with an infinite number of terms. Later  scholars,  including 12th-century Persian mathematician Omar Khayyam, solved certain cubic equations geometrically by using conic sections. Arab astronomers contributed the tangent and cotangent to trigonometry. Geometers such as Ibrahim ibn Sinan in the 10th century continued Archimedes’s investigations of areas and volumes, and Kamal al-Din and others applied the theory of conic sections to solve problems in optics. Astronomer Nasir al-Din al-Tusi created the mathematical disciplines of plane and spherical trigonometry in the 13th century and was the first to treat trigonometry separately from astronomy. Finally, a number of Muslim mathematicians made important discoveries in the theory of numbers, while others explained a ariety of numerical methods for solving equations. Many  of  the  ancient  Greek works on mathematics were preserved during the middle Ages through Arabic translations and commentaries. Europe acquired much of this learning during the 12th century, when Greek and Arabic works were translated into Latin, then the written language of educated Europeans. These Arabic works, together with the Greek classics, were responsible for the growth of mathematics in the West during the late middle Ages. Microsoft  ® Encarta  ® 2009.  © 1993-2008 Microsoft Corporation. All rights reserved. D. Origin of the Word Algebra The word algebra is a Latin variant of the Arabic word al-jabr. This came from the title of a book, Hidab al-jabr wal-muqubala, written in Baghdad about 825 A. D. by the Arab mathematician Mohammed ibn-Musa al-Khowarizmi. The words jabr (JAH-ber) and muqubalah (moo-KAH-ba-lah) were used by al-Khowarizmi to designate two basic operations in solving equations. Jabr was to transpose subtracted terms to the other side of the equation. Muqubalah was to cancel like terms on opposite sides of the equation. In fact, the title has been translated to mean â€Å"science of restoration (or reunion) and opposition† or â€Å"science of transposition and cancellation† and â€Å"The Book of Completion and Cancellation† or â€Å"The Book of Restoration and Balancing. † Jabr is used in the step where x – 2 = 12 becomes x = 14. The left-side of the first equation, where x is lessened by 2, is â€Å"restored† or â€Å"completed† back to x in the second equation. Muqabalah takes us from x + y = y + 7 to x = 7 by â€Å"cancelling† or â€Å"balancing† the two sides of the equation. Eventually the muqabalah was left behind, and this type of math became known as algebra in many languages. It is interesting to note that the word al-jabr used non-mathematically made its way into Europe through the Moors of Spain. There an algebrista is a bonesetter, or â€Å"restorer† of bones. A barber of medieval times called himself an algebrista since barbers often did bone-setting and bloodletting on the side. Hence the red and white striped barber poles of today. II. Insights The Arabian contributions to Mathematics are much used around the world. Their Mathematics shows a perfect way to represent numbers and problems, in a way to make it clearer and easier to understand. They have discovered many things about mathematics and formulated many formulas that are widely used today. I learned from this research that Arabs mathematics started when Indian mathematics reached Baghdad and translated it into Arabic. They improved and studied Mathematics and formulated many things. They become more famous when they discovered Algebra and improved it. Many Arabian mathematicians became famous because of their contributions on Mathematics. Many ancient Greeks works on mathematics were preserved through Arabic translations and commentaries. I am enlightened about the origin of what are we studying now in Mathematics. Now I know that majority of our lessons in mathematics came from Arabians not from Greeks. I also learned that many mathematicians contributed on different branches and techniques on mathematics and it take so much time for them to explore and improve mathematics.

Happiness for Our Life

HAPPINESS for OUR LIFE WHAT IS HAPPINESS: Happiness is thought of as the good life, freedom from suffering, flourishing, well-being, joy, prosperity, and pleasure. Are you truly happy? Do you even know what it means to be happy and what it takes to achieve happiness? These are important questions for anyone who is seeking happiness to ask themselves. I live my life to maintain my own happiness while trying my best to not cause unhappiness to anyone else. If you want to be happy you need to understand that you can be happy and that you should be happy.Many people make the mistake of believing that they don’t deserve happiness and accept their unhappy state as their destiny. The truth of the matter is that happiness, like anything else in life, needs to be nurtured. Two Faced I Smile When I’m Happy, I Smile more When I’m Sad FEW TIPS TO FOLLOW TO CREATE HAPPINESS IN OUR LIFE: 1. Understand what it is that will make you happy. Everyone has unique requirements for at taining happiness and what makes one person happy may be very different from what makes someone else happy. Revel in your individuality and do not worry about whether or not your desires are comparable to those of your peers. . Make a plan for attaining goals that you believe will make you happy. Your mood will very likely increase as your pursue your goal because you will feel better about yourself for going after something you value. 3. Surround yourself with happy people. It is easy to begin to think negatively when you are surrounded by people who think that way. Conversely, if you are around people who are happy their emotional state will be infectious. 4. When something goes wrong try to figure out a solution instead of wallowing in self pity.Truly happy people don’t allow setbacks to affect their mood because they know that with a little thought they can turn the circumstances back to their favor. 5. Spend a few minutes each day thinking about the things that make you happy. These few minutes will give you the opportunity to focus on the positive things in your life and will lead you to continued happiness. 6. It’s also important to take some time each day to do something nice for yourself. Whether you treat yourself to lunch, take a long, relaxing bath or simply spend a few extra minutes on your appearance you will be subconsciously putting yourself in a better mood. . Finding the humor in situations can also lead to happiness. While there are times that require you to be serious, when it is appropriate, find a way to make light of a situation that would otherwise make you unhappy. 8. Maintaining your health is another way to achieve happiness. Being overweight or not eating nutritious foods can have a negative effect on your mood. Additionally, exercise has been known to release endorphins that give you a feeling of happiness. 9. Finally, it is important to understand that you deserve happiness.Those who believe that they are not worthy of happiness may subconsciously sabotage their efforts to achieve happiness. If necessary, tell yourself each day that you deserve to be happy and remind yourself what steps you will take to achieve the happiness you desire. Happiness is hard to define but most people are aware of whether they are happy or not. Many people believe that happiness is a form of luck and that some people are destined to be happy while others are destined to be unhappy. The tips in this article are small but meaningful steps that you can take each day to lead you to true happiness. Happiness for Our Life HAPPINESS for OUR LIFE WHAT IS HAPPINESS: Happiness is thought of as the good life, freedom from suffering, flourishing, well-being, joy, prosperity, and pleasure. Are you truly happy? Do you even know what it means to be happy and what it takes to achieve happiness? These are important questions for anyone who is seeking happiness to ask themselves. I live my life to maintain my own happiness while trying my best to not cause unhappiness to anyone else. If you want to be happy you need to understand that you can be happy and that you should be happy.Many people make the mistake of believing that they don’t deserve happiness and accept their unhappy state as their destiny. The truth of the matter is that happiness, like anything else in life, needs to be nurtured. Two Faced I Smile When I’m Happy, I Smile more When I’m Sad FEW TIPS TO FOLLOW TO CREATE HAPPINESS IN OUR LIFE: 1. Understand what it is that will make you happy. Everyone has unique requirements for at taining happiness and what makes one person happy may be very different from what makes someone else happy. Revel in your individuality and do not worry about whether or not your desires are comparable to those of your peers. . Make a plan for attaining goals that you believe will make you happy. Your mood will very likely increase as your pursue your goal because you will feel better about yourself for going after something you value. 3. Surround yourself with happy people. It is easy to begin to think negatively when you are surrounded by people who think that way. Conversely, if you are around people who are happy their emotional state will be infectious. 4. When something goes wrong try to figure out a solution instead of wallowing in self pity.Truly happy people don’t allow setbacks to affect their mood because they know that with a little thought they can turn the circumstances back to their favor. 5. Spend a few minutes each day thinking about the things that make you happy. These few minutes will give you the opportunity to focus on the positive things in your life and will lead you to continued happiness. 6. It’s also important to take some time each day to do something nice for yourself. Whether you treat yourself to lunch, take a long, relaxing bath or simply spend a few extra minutes on your appearance you will be subconsciously putting yourself in a better mood. . Finding the humor in situations can also lead to happiness. While there are times that require you to be serious, when it is appropriate, find a way to make light of a situation that would otherwise make you unhappy. 8. Maintaining your health is another way to achieve happiness. Being overweight or not eating nutritious foods can have a negative effect on your mood. Additionally, exercise has been known to release endorphins that give you a feeling of happiness. 9. Finally, it is important to understand that you deserve happiness.Those who believe that they are not worthy of happiness may subconsciously sabotage their efforts to achieve happiness. If necessary, tell yourself each day that you deserve to be happy and remind yourself what steps you will take to achieve the happiness you desire. Happiness is hard to define but most people are aware of whether they are happy or not. Many people believe that happiness is a form of luck and that some people are destined to be happy while others are destined to be unhappy. The tips in this article are small but meaningful steps that you can take each day to lead you to true happiness.

Chondrogenesis Of Adult Stem Cells Health And Social Care Essay

1.0 IntroductionDegenerative gristle diseases, such as degenerative arthritis ( OA ) , affect 1000000s of people worldwide and therefore have tremendous societal and economic effects. Osteoarthritis is characterized by progressive devastation of articular gristle and finally the full articulation, associated with variable grades of local redness, motional hurting, puffiness of the damaged tissue and thickener of the articulations. The internal fix capacity of articular gristle is hapless due to several alone features of the tissue, including slow turnover of gristle collagen, deficiency of vascularisation and the low figure of root cells that could lend to the fix. In mature articular gristle, chondrocytes have small intrinsic potency for fix. Repair may happen by an extrinsic mechanism, which depends on mesenchymal stromal cells ( MSCs ) in next connective tissue. Several intervention options have been used for gristle fix in gristle lesions, including soft tissue trades, and chondrocyte and osteochondral organ transplant. However these methods are limited by the hapless handiness of suited donor tissue and the hazard of infection and implant failure associated w ith entire joint replacings [ 14 ] . These restrictions are the driving force behind much research into cell-based methods for efficaciously handling diseased or damaged gristle [ 15 ] . Tissue technology has been defined as â€Å" an interdisciplinary field that applies the rules of technology and the life sciences toward the development of biological replacements that restore, maintain, or better tissue map † [ 14 ] ) . Tissue technology schemes by and large involve the undermentioned phases: ( 1 ) designation and isolation of a suited beginning of cells ; ( 2 ) industry of a device to either carry or encapsulate the cells ; ( 3 ) uniform seeding of cells onto or into the device and appropriate civilization ; and ( 4 ) in vivo nidation of the engineered concept ( Figure-1 [ 16 ] ) . Figure-1: Conventional representation of a tissue technology scheme: ( A ) isolation of an appropriate cell population ; ( B ) fiction of a scaffold ; ( C ) seeding of cells into scaffold and in vitro civilization of cell-scaffold concept ; and ( D ) nidation of tissue engineered device. The field of tissue technology has opened up new possibilities for fix and regeneration of gristle by uniting cells, biomaterial scaffolds, and bioactive signals [ 1, 2 ] . Mesenchymal cells ( MSCs ) offer a promising beginning due to its ability to proliferate extensively and distinguish into multiple cell line of descents in vitro and in vivo, including chondrocytes, bone-forming cells and adipocytes [ 6 ] . MSCs are present in a assortment of grownup tissues, such as bone marrow and adipose tissue. Adult root cells derived from adipose tissue ( adipose-derived root cells, ASCs ) [ 3,4 ] and bone marrow ( bone marrow-derived mesenchymal root cells, BMSCs ) [ 5,6 ] have shown important chondrogenic potency for such a tissue technology attack [ 7-10 ] . The BMSCs or human bone marrow stromal root cells can be cultured, expanded and so transplanted into the injured site or, after seeding on molded polymer scaffolds, placed back in the patient to bring forth appropriate tissue concepts. It is a instead clip overwhelming process for the patients and the research lab employees. Besides, these BMSCs have a low cell figure upon reaping so they need to be expanded and so transplanted to the injured site or seeded on/in a polymer scaffold. The procedure takes much clip as besides the clip it requires in the research lab, the patients need to be operated twice, first to roll up the BMSCs and-or stabilise the defect and so to put the scaffold or transfer the BMSCs. Adipose tissue might be a promising alternate beginning of root cells that could hold far-reaching effects on several Fieldss including gristle tissue technology. It is really good known that root cells derived from adipose tissue are capable to distinguish into adipocytes, chondrocytes, bone-forming cells and myoblasts, like Mesenchymal Stem Cells ( MSCs ) . ASCs have attracted involvement due to ease of isolation process and comparative copiousness handiness of cells as compared to BMSCs [ 11, 12 ] . Large figure of ASCs in adipose tissue makes them an ideal campaigner for so called â€Å" one measure surgical process † for the intervention of osteo chondral defects [ 13 ] . Chondrogenic distinction of these cells may be induced by specii ¬?c cytokines, growing factors [ 22 ] , biophysical stimulation such as hydrostatic force per unit area, hyperosmolarity, hypoxia and proviso of a suited three-dimensional ( 3-D ) environment. In this literature describe the focal point is on methods used for bring oning adipose derived root cells and bone marrow derived root cells into the chondrogenic line of descent and besides to know apart initiation methods between adipose derived root cells and bone marrow derived root cells. This leads to treatments on ( 1 ) rudimentss of gristle tissue technology and the usage of root cells ( 2 ) features and biological facets of BMSCs ( 3 ) features and biological facets of root cells derived from adipose tissue ( 4 ) difference between these two root cells, ( 5 ) Factors used for bring oning adipose root cells in to chondrogenic line of descent2.0 Cartilage2.1 Cartilage biological scienceCartilage is a an avascular, aneural and alymphatic connective tissue nowadays in many sites of the craniate organic structure, including the jointing articulations between castanetss, rib coop, ear, nose, bronchial tubings and intervertebral phonograph record. Cartilage is classified in three s ubtypes based on its morphology and the composing of the extracellular matrix ( ECM ) asA hyaloid gristle, elastic cartilageA andA fibro-cartilage. Out of the three subtypes hyaloid gristle is rich in collagen type II and proteoglycan and it is found in between articulations. Besides it is the lone gristle subtype that can prolong mechanical strain. Articular gristle, which is present at the jointing surfaces of castanetss within synovial articulations, is formed from hyaloid gristle. The location of articular gristle within the articulatio genus articulation is shown in Figure 2. Articular gristle forms a lasting bed with a thickness of 0.5 to 7.0mm at the surface cut downing clash between the castanetss and administering tonss across the full articulation surface [ 89 ] . The one disadvantage of gristle is that unlike other type of tissues, foods are non supplied by blood vass alternatively diffuse through the matrix and gristle is repaired at a slower rate than other connective t issues. This is due to the deficiency of the three-step lesion mending procedure nowadays in other tissues ; i.e. redness, proliferation and tissue remodeling. Chondrogenesis is the procedure by which gristle is formed from condensed mesenchymal connectiveA tissue, which differentiates intoA chondrocytesA and secretes the molecules that form the extracellular matrix. The procedure begins with the collection and condensation of loose mesenchyme. Early in foetal development, the greater portion of the skeleton is cartilaginous. ThisA temporaryA gristle is bit by bit replaced by bone ( Endochondral ossification ) , a procedure that ends at pubescence. In contrast, the gristle in the articulations remains unossified during the whole of life and is, hence, A permanent. Factors such as the bone morphogenetic proteins ( BMPs ) are known to play critical functions in the compression of mesenchymal cells and the defining of the condensation [ 17 ] . As discussed before, onceA damaged gristle has limited fix capablenesss sinceA chondrocytesA are bound inA blank, they can non migrate to damaged countries. Fig-2 Location of articular gristle within the articulatio genus articulation ( adapted from Drury and Shipley 1998 ) .2.2 Cartilage tissue technologyAs gristle healing is limited, there exists a turning demand for cell based schemes for gristle fix. The quickly rising field of tissue technology holds great promise for the coevals of functional tissue replacements, including gristle, by technology tissue constructsA in vitroA for subsequent implantationA in vivo. The basic rule is to use a biocompatible, structurally and automatically sound scaffold that is seeded with an appropriate cell beginning, and is loaded with bioactive molecules to advance cellular distinction and/or ripening. Although advancement has been made late in technology gristle of assorted forms and sizes for decorative intents [ 18 ] , the challenges of technology a weight-bearing tissue, such as articular gristle that consists of multiphasic cellular architecture, are important. Articular gristle provides its ain peculiar challenges for tissue technology. Though its construction appears simple and contains merely one cell type, it has a complex and extremely organized extracellular matrix ( ECM ) . The physical belongingss of articular gristle depend on the construction and organisation of the supermolecules in the ECM. The construction of collagen gives it impressive tensile belongingss, which is utile to bring forth a tissue that is non merely strong in tenseness but besides immune to compaction. This is achieved by make fulling the interfibrillar matrix with a really high content of proteoglycan, chiefly aggrecanA [ 19, 20 ] . The challenge for gristle tissue technology is to bring forth gristle tissue with suited construction and propertiesA ex vivo, which can be implanted into articulations to supply a natural fix that with clip, will go incorporate with the patient ‘s tissues. There have been a figure of successful attacks to weave applied scientist gristle, including the usage of natural and man-made biomaterial scaffolds, allogeneic and autologous beginnings of mature chondrocytes and chondroprogenitor cells, biophysical cues such as hydrostatic force per unit area, hyperosmolarity, hypoxia, chondroinductive growing factors, such as the transforming growing factor-I?s ( TGF-I?s ) , and combinations thereof. Some of the current progresss in cartilage tissue technology are highlighted here.3.0 Characterization and biological facets of Adipose root cells and bone marrow root cells3.1 Bone marrow-derived root cells ( BMSCs )Bone marrow contains three types of root cells, haematopoietic root cells, m esenchymal root cells and endothelial root cells. Hematopoietic root cells give rise to the three categories of blood cells that are found in the circulation white blood cellsA ( leucocytes ) , A ruddy blood cells ( red blood cells ) , andA plateletsA ( platelets ) . Mesenchymal root cellsA are found arrayed around the cardinal fistula in the bone marrow. They have the capableness to distinguish intoA bone-forming cells, chondrocytes, A myocytes, and many other types of cells. Stem cells obtained from bone marrow are found in the stroma of the marrow. These cells are typically obtained from bone marrow aspirates from marrow graft givers. When cultured in vitro, bone marrow root cells exhibit a fibroblast-like morphology. Marrow stromal cells have been studied and certain cell surface markers have been identified which are utile in cell choice and finding of readying of marrow root cell populations [ 21 ] . In add-on to their ability to distinguish into multiple cell line of descents, the usage of bone marrow root cells offer a beginning of cells that is isolated and expanded in vitro. Bone marrow-derived root cells were isolated and described for the i ¬?rst clip by Friedenstein and Owen at the University of Oxford, UK, in the 1960s, followed by intensive work on the survey of the belongingss of these cells [ 23-29 ] . They took bone marrow and incubated for 4 hours in fictile civilization dishes and removed the non-adherent cells. A heterogonous population of cells was retrieved, with some adherent cells exhibiting a spindle form ; besides, they multiplied quickly in vitro, organizing distinguishable settlements called colony-forming unit i ¬?broblasts ( CFU-Fs ) . Finally, these cells were successfully isolated from several mammals, including worlds [ 30,31 ] . In add-on, the CFU-Fs were found to hold multi-potent, therefore connoting that they have stem cell belongingss [ 29,32 ] . These cells differentiated into multiple mesenchymal cell line of descents in vitro, including bone [ 33 ] , ligament [ 34 ] , adipose [ 33 ] , gristle [ 35,36 ] and musculus [ 3 7 ] . Similarly, following the organ transplant of CFU-Fs in vivo, they formed little sedimentations of bone, gristle or fat [ 37-39 ] . This was further supported the multi-potent potency of CFU-Fs. Similar cells have been isolated from different mesenchymal tissues, including synovial [ 40 ] , sinews [ 41 ] , skeletal musculuss [ 42 ] and adipose tissue [ 43,44 ] . BMSCs are normally isolated from the mononucleate bed of bone marrow after separation by denseness gradient centrifugation. These mononucleate cells are cultured in media incorporating 10-15 % foetal calf or autologous serum [ 45 ] . The BMSCs adhere to the tissue civilization plastic, go forthing little adherent i ¬?broblast-like cells. Thereafter, the cells divide and proliferate quickly. For in vitro chondrogenic distinction MSCs are needed to be kept in high denseness 3-D environment. This can be attained by aggregating the cells in mircomass pellets or as suspension in alginate. Different man-made or biological scaffolds like agarose, collagen suspensions, fibrin gels and biopolymers can be used [ 46-48 ] . Alginate bead civilization is an first-class tool for chondrogenic distinction surveies in vitro. Alginate is a additive polyose which is soluble in aqueous solutions and cells can be homogenously suspended in it. It is cross-linked in presence of Ca or other bivalent ions to organize a polymerized hydrogel. Importantly, it can be easy resolubilized by a chelating agent ethylenediaminetetraacetate ( EDTA ) to divide cells from the ECM [ 49 ] . Chondrogenic distinction is a complicated procedure necessitating good defined conditions, hence, external foetal calf serum ( FCS ) usually used for proliferation of MSCs has to be substituted by defined medium addendum, like widely used ITSa„? . ITSa„? contains insulin, beta globulin, selenious acid and linoleic acid suspended in solution of bovine serum albumen. Insulin as a endocrine addendum is necessary for endurance of cells as it is involved in fatty acid and animal starch synthesis. Transferrin is an iron-binding protein for endocrines and foods, hence, it is critical for in vitro cell growing and selenious acid is a cofactor for glutathione peroxidase necessary for cell membrane unity. Linoleic acid is an built-in constituent of chondrogenic medium, like many unsaturated fatty acids it is an built-in membrane constituent and of import for cell growing. It is non a specific chondrogenic distinction factor but in combination with Tgf-? has profound stimulatory consequence on chondrogenesis. Tgf-? entirely and in combination with Decadron enhance chondrogenesis [ 50,51 ] . The chondrogenic medium has to be enriched with proline because this amino acid is found in really high concen trations in extracellular matrices. Pro-x-gly-pro sequence motive appears really often in collagens where ten is normally a impersonal amino acid. Ascorbic acid is required as an negatron giver, therefore it contributes collagen synthesis by moving as a carbon monoxide factor for lysine proline hydroxylation necessity for the formation of typical-triple coiling collagen constructions [ 52 ] . As all the needed conditions are met MSCs start to lose their fibroblast like features and get down showing chondrocyte particular ECM which can be monitored by look of chondrogenic markers. Several other methods are used to assist distinguish MSCs into osteocytes, adipocytes, myocytes or tenocytes in vitro. Bone marrow aspirates are still being used though there are major restraints. The chief restraints in utilizing BMSCs are: heterogenous population of the cells, painful process to roll up the bone marrow and the population of MSCs nowadays in bone marrow is really low ( 0.001-0.01 % or about 1 MSC per 105 disciple stromal cells ) [ 53 ] . Besides MSCs needs to be expanded in vitro for a longer period of clip before adequate cells are present for seeding the scaffold or organ transplant [ 53 ] . These restraints favours the statement for placing new beginnings as feasible options to cram marrow, but farther surveies in clinically relevant animate being theoretical accounts are needed to better qualify the comparative – in our case- chondrogenic potency. One of these options might lie in the usage of root cells derived from adipose tissue.3.2 Adipose tissue-derived root cellsIn order to utilize adipose tissue for the usage of tissue technology, the composing of this tissue needs to be analyzed foremost. Adipose tissue is specialized connective tissue that maps as the major storage site for fat in the signifier of triglycerides. In grownup mammals, the major majority of adipose tissue is a loose association of lipid-filled cells, which are held in a model of collagen fibres. Adipose tissue, better known as fat is composed of blood cells, endothelial cells, pericytes, fibroblasts, adipose precursor cells, and adipocytes [ 54, 55 ] . Fat is divided into two types ( I ) br own adipose tissue ( BAT ) and white adipose tissue ( WAT ) . The morphology and map of brown fat cells are distinguishable from white adipocytes. The map of BAT is to interpret energy into heat production [ 56 ] . Phenotypically, brown fat cells are rich in chondriosome and accumulate lipoids in multiple little droplets [ 57 ] . The tissue what is normally recognized as â€Å" the fat † , which is besides the larger proportion of the organic structure fat, consists of WAT. Mature adipocytes of WAT are cells with one big lipid droplet and really small cytol with the karyon located at fringe of the cell [ 54 ] . This morphology is described as the signet pealing signifier and the cell may be termed a univacuolar adipocyte. White adipose tissue serves three maps: heat insularity, mechanical shock absorber, and most significantly, a beginning of energy [ 55 ] ( Fig 1 ) Figure 1a†Ã¢â‚¬Å¡ White fat cell and brown fat cell. Note the individual big lipid vacuole in the white fat cell and the legion smaller lipid vacuoles in the brown fat cell. LV: lipid vacuole ; M: chondriosome ; N: karyon. Artwork courtesy of Dr. John Horwitz, U.C. Davis. The white fat cells range in size from 25 to 200 micrometers. Mitochondrions are found preponderantly in the thicker part of the cytoplasmatic rim near the karyon. The big lipid droplet does non look to incorporate any intracellular cell organs. A brown fat cell may make a diameter of 60 micrometers and the lipid droplet within the cell may make 25 micrometers in diameter. The brown colour of this tissue is derived from the cells ‘ rich vascularization and dumbly jammed chondriosomes. These chondriosomes vary in size and may be round, egg-shaped, or filiform in form [ 56,57 ] .3.3 Biological facets of ASCs in vivo and in vitroThe exact beginning of the adipocyte, the chief cells of adipose tissue, is still non to the full understood. The earliest phase in adipocyte distinction is pluripotent root cells which give rise to mesenchymal precursor cells [ 58 ] . These pluripotent root cells are the adipose-derived grownup root ( ASCs ) cells. These ASCs are capable to distinguish in to the chondrogenic, osteogenic, and adipogenic line of descents, neural cells and clamber [ 58 ] . ASCs, besides called processed lipoaspirate cells ( PLA cells ) , are considered a separate cell population within the adipose tissue [ 4 ] . The capacity of ASCs to distinguish into several tissues suggests the presence of a root cell population within adipose tissue, it can non be ruled out though the presence of pluripotent cells from other beginnings, like marrow-derived MSCs from peripheral blood, or dedifferentiation of mature adipocytes will ensue in the coevals of pluripotent cells. However, the presence of MSCs in peripheral blood is non likely. The sum of MSCs in bone marrow is low, i1 MSC per 105 stromal cells [ 6,53 ] and the sum of MSCs in peripheral blood is even lower. One major advantage of ASCs is that it can be isolated from many fat terminals within the organic structure by minimally invasive suction lipectomy and by subsequent enzymatic digestion of adipose tissue [ 4 ] . Besides deficit of autologous donor tissue is, in the instance of adipose tissue, really improbable in most persons. ASCs are located in the stromal-vascular fraction ( SVF ) of the host adipose tissue. Adipose tissues are normally harvested by resection or suction lipectomy and later digested with collagenase type I. Once the stromal-vascular multitudes are isolated, they are cultured in lineage-specific civilization media. For chondrocyte distinction the cells are cultured in DMEM supplemented with FBS, insulin, transforming growing factor ( TGF ) , ascorbate and Decadron at suited concentrations. ASCs are able to defy freeze/thaw direction without any apparent impact on the growing characteristic. However, when adipose tissue is harvested from the organic structure the surgical processs used have some impact on the subsequent growing profile of ASC. Ultrasound-assisted suction lipectomy consequences in a lower frequence of proliferating ASC, every bit good as a longer population duplicating clip of ASC, compared with pure resection and puffy resection. Phenotypic markers are non affected by ultr asound intervention [ 59 ] . Guilak et Al. showed that ASCs ringers derived from lipoaspirates can distinguish along two or more of the adipogenic, osteogenic, chondrogenic and neuron-like cells [ 60 ] . These findings coupled with the fact that ASCs can undergo several population doublings while retaining their distinction capablenesss, supports the hypothesis that ASCs are a type of multi-potent grownup root cells [ 60, 61 ] . In vitro, distinction of ASCs cells can be induced by the supplementation of endocrines and substrates to the growing medium. Some illustrations are: Glucocorticoids ( corticosterone, hydrocortisone, dexamethason, and cortisol ) , phosphodiesterase inhibitors ( IBMX, forskolin ) , peroxisome proliferator-activated receptor ( PPAR I? ) ligands ( adipogenic distinction ) , indomethacin, fibrates ( Atromid-S, bezafibrate, and fenofibrate ) , insulin, and liothyronine. Besides growing factors have been found to modulate distinction, like basic FGF, EGF, PDGF, TGF I? , and TNF [ 44 ] . An illustration of lineage-specific distinction induced by media supplementation is demonstrated by Zuk et Al. [ 44 ] . The experimental and clinical grounds shows that ASCs are an equal alternate beginning for regenerative medical specialty peculiarly because it can be maintained in vitro for drawn-out periods of clip with stable population doublings and low aging degrees [ 4 ] . Although the bone marrow is a dependable beginning of root cells, its crop is an invasive process and the figure of stray cells can be low and age dependant. Pittenger et Al. [ 6 ] showed that merely 0.01-0.001 % of mononucleate cells isolated from the bone marrow lead to colony-forming units. On the other manus, adipose tissue can give big sums of root cells and can be obtained in copiousness. As such, ASCs open legion and promising positions for regenerative therapies.4.0 Factors impacting chondrogenesis4.1 Consequence of Growth factors on chondrogenesisThe usage of cytokines and growing factors is really of import for the development of a defined civilization environment for directing the chondrogenic distinction of root cells. Indeed, legion cytokines and growing factors have been implicated in chondrogenesis. As the procedure of chondrogenesis is so closely related with osteogenesis, many of the cytokines and growing factors that promote chondrogenic distinction are besides some what involved in osteogenic distinction [ 62, 63 ] . Hence, the challenge is to happen an optimized elusive combination of these assorted cytokines and growing factors that would assist in distinction specifically toward the chondrogenic line of descent. Among the most powerful inducers of chondrogenic distinction are members of the transforming growing factor beta ( TGF-I? ) household. Besides the assorted iso-forms of TGF-I? [ 64,66-67 ] and bone morphogenetic protein ( BMP ) [ 65,68 ] , other members of the TGF-I? ace household include activin [ 69 ] , osteogenic protein-1 [ 70 ] , and growing distinction factor 5 ( GDF-5 ) [ 71 ] are used. The effects of cytokines of the TGF-I? ace household on chondrogenic distinction are transduced through two major intracellular signaling tracts, SMAD household of signaling molecules [ 72 ] and involves mitogen-activated protein kinase ( MAPK ) signaling [ 73 ] . Interestingly, both signaling Cascadess are activated by the same TGF-I? receptor composite. Barry et al demonstrated that TGF-I? 2 and TGF-I? 3 iso-forms have stronger chondrogenic potency than TGF-I?1 [ 78 ] . Kim et Al showed that combinations of greater doses of presently known growing factors, TGF-I? 2 and IGF-I, lead to a chondr ogenesis from ASCs comparable to that observed with BMSCs [ 79 ] . Another household of cytokines that plays an of import function in chondrogenesis is comprised of assorted iso-forms of fibroblast growing factor ( FGF ) . The effects of FGF on chondrogenic distinction are transduced chiefly through MAPK signaling [ 74 ] . This leads to increased look of the written text factor Sox9, which is the maestro regulator of chondrogenesis. Besides the TGF-I? and FGF household of cytokines, insulin like growing factor-1 ( IGF-1 ) [ 75-77 ] has besides been shown to hold effects on chondrogenic distinction.4.2 Effect of biomaterial scaffolds ( biologic, biochemical and biomechanical belongingss ) on ChondrogenesisA broad scope of scaffolds have been used in gristle tissue technology surveies. Cartilage regeneration utilizing scaffolds involves seeding extremely porous biodegradable scaffolds with donor cells and/or growing factors. After seeding the scaffolds with the giver cells and/or grow ing factors, these scaffolds are implanted. Cells attached to the scaffold, so retroflex, distinguish into chondrogenic cells and form into normal healthy bone as the scaffold degrades. These scaffolds may be categorized with regard to the types of stuff used ( natural or man-made, degradable or non-degradable ) , the geometry of the scaffold ( gels, hempen meshes or porous sponges ) and their construction ( entire porousness, pore size, connectivity and distribution ; [ 103 ] . It is important that a tissue technology scaffold is fabricated from a stuff that is biocompatible, allows fond regard of cells, ECM secernment and tissue formation without the initiation of an inflammatory or toxic response [ 104 ] . In order for cells to be able to infiltrate the construction uniformly, it should incorporate a big figure of interrelated pores [ 105 ] . The size of the pores is of import to the infiltration and fond regard of the cells, for chondrocytes an optimal pore size of between 100 a nd 200I?m has been suggested [ 104 ] . The scaffold must besides be permeable, to let diffusion of foods into the matrix and the remotion of metabolic and degradation byproducts from it. Finally, it is of import that the scaffold has mechanical belongingss that allow it to defy nidation and the tonss experienced in vivo Many natural stuffs have been used because of their similarity with gristle ECM constituents, for illustration hyaluronan and collagen [ 106 ] . Other natural stuffs used in gristle tissue technology surveies include agarose, alginate and chitosan. Natural polymers are advantageous in tissue technology applications as they can undergo cell-specific interactions. The usage of natural stuffs, nevertheless, is limited by the big fluctuation between batches, the deficiency of big supplies for commercial usage and as they are frequently derived from non-human tissue they carry the hazard of reassigning pathogens [ 107 ] . Man-made polymers are frequently used in penchant to natural stuffs as it is possible to mass-produce polymers with custom-designed belongingss. Poly ( lactic acid ) ( PLA ) , poly ( glycolic acid ) ( PGA ) and co-polymers of PLA and PGA ( PLGA ) are normally used in tissue technology surveies as they have Food and Drug Administration ( FDA ) blessing for usage within the human organic structure. Ideally a scaffold that is to be implanted into the human organic structure should be biodegradable ) and the debasement merchandises should be non-toxic [ 104 ] .4.3 Effect of hypoxia on chondrogenesisOxygen lack within gristle tissues induces a hypoxic province which affects chondrocyte map. Cells exposed to hypoxia respond in many ways by impacting cistron look, distinction, and programmed cell death [ 91 ] . Transcription factor HIF-1I ± is considered as a survival factor for bring oning in hypoxic environments which inhibits proliferation but increases ECM production in mesenchymal ro ot cells ( MSCs ) and chondrocytes [ 92, 93 ] . Conditional omission of the cistron encoding HIF-1I ± in chondrocytes consequences in programmed cell death in hypoxic countries [ 92 ] and besides well reduces the chondrogenic possible [ 94 ] , proposing that hypoxia-induced up-regulation HIF-1I ± supports chondrogenic committedness. HIF-2I ± has besides been shown to command hypoxia enhanced chondrogenesis through both SOX9 dependant and independent signaling tracts [ 95 ] . Thus, hypoxia enhances the chondrogenic potency of mesenchymal cell populations during the development phase and under diseased conditions.4.4 Effect of hydrostatic force per unit area on chondrogenesisHydrostatic force per unit area has been proved to hold positive consequence on gristle in a figure of surveies [ 80 ] as exposure to increased hydrostatic force per unit area coincide with increased gristle thickness in vivo [ 81,82 ] . Cartilage is a extremely hydrous tissue, represent 70 % to 80 % H2O per moisture weight. Cartilage cells located in articular articulations experience hydrostatic force per unit area during periods of lading. The synovial fluid within the joint capsule transmits force per unit area to the H2O trapped within the gristle matrix, bring forthing a unvarying burden on chondrocytes in the tissue. The attractive force of negatively charged proteoglycan molecules within gristle causes its high H2O content, making a matrix that is composed chiefly of interstitial fluid. The swelling force per unit area of the proteoglycans is balanced by the tenseness of the collagen web, leting the tissue to swell significantly but still be a comparatively stiff stuff. High H2O content in the tissue plays a major function in the ability of the tissue to defy big compressive forces. Cartilage is incompressible under physiological degrees of hydrostatic force per unit area ( 7-10 MPa ) , ensuing in minimum tissue distortion [ 83-85 ] . Loading in this mode is comparatively safe for the structural unity of the tissue because it is a pure hydrostatic force per unit area that does non stretch or shear the tissue matrix. When gristle is loaded, the force is transmitted throughout the tissue, the fluid stage ab initio supports the applied burden, because H2O is trapped within the solid matrix of the tissue because of its low permeableness. The alteration in force per unit area from within the matrix finally forces fluid out of the tissue and into the synovial pit. The opposition that the fluid experiences as it leaves the matrix helps disperse energy and allows for a gradual softening of the tissue. This procedure efficaciously cushions the daze of a sudden burden without damaging the cells or extracellular matrix. The force per unit area that is produced by the tight fluid Acts of the Apostless uniformly on the chondrocytes within the matrix. This interstitial force per unit area, which for diarthrodial articulations ranges between 7 and 10 MPa during normal a ctivities [ 83,84 ] , is applied sporadically to the cells when walking, running, or switching weight while standing. Research workers emulated the mechanical stimulation in the research lab to engineer a higher quality gristle tissue [ 85-87 ] . The continuance and magnitude of hydrostatic lading vary widely as demonstrated by different surveies. Smith and associates exposed high-density chondrocyte monolayers to 10 MPa at 1Hz for 4h a twenty-four hours and obtained an addition of 65 % in GAG synthesis [ 88 ] . In another experiment utilizing the same lading regimen on cell monolayers, Smith and associates obtained a 9-fold addition in type II collagen messenger RNA and a 20-fold addition in aggrecan messenger RNA [ 89 ] . In a 3-dimensional experiment by Carver and Heath, concentrations of sulfated proteoglycans in civilized scaffolds were found to be twice every bit high as in controls after utilizing a 3.5-MPa, intermittent force ( 5/15 s on/off for 20 min every 4 H ) [ 90 ] . T hese consequences show that hydrostatic force per unit area is of import to chondrogenesis, particularly when cells are grown in a 3-dimensional environment.4.5 Effect of hyperosmolarity on chondrogenesisDuring mechanical burden, flow of H2O out of joint gristle will take to increase in osmotic force per unit area within the tissue. This indicates that osmotic force per unit area may positively act upon chondrogenesis. Osmotic force per unit area within the tissues additions due to the keeping of the extremely anionic proteoglycan and the necessary cationic counter ions and the osmotic force per unit area around the chondrocyte is changed straight by the burden on the tissue. Assorted surveies conducted to look into the effects of osmolarity on chondrocyte ECM synthesis shown that chondrocyte proteoglycan synthesis can be decreased through the application of hyper- or hypo-osmotic conditions [ 98,100,101 ] . Besides a survey conducted late explained that application of dynamic hypo- osmotic emphasiss resulted in increased look of gristle ECM cistrons [ 96 ] . The survey besides showed an addition in glycosaminoglycan synthesis by articular chondrocytes under hyperosmotic conditions [ 97 ] over 24h civilizations. It besides showed the demand for p38 mitogen-activated protein kinase ( MAPK ) signaling, a transduction pathway known to be regulated by osmolarity in many beings [ 99 ] . Besides Wouter et Al. in his recent survey demonstrated that the application of hyperosmolarity and hypoxia in combination, is able to bring on chondrogenesis in ASCs to the same degree as initiation with transforming growing factor I?1 [ 102 ] .5.0 Conclusion and future waiesThe usage of MSCs in gristle tissue technology applications is a powerful ( new ) tool in the development of clinical schemes for fix of site-specific gristle defects and will assist to handle assorted gristle upsets. Currently bone marrow aspirates are still considered to be the most accessible and enriched beginning of MSCs [ 6 ] . However, the sum of cells at initial crop are limited in bone marrow aspirations, which makes bone marrow non an optimum beginning of MSC [ 4,16 ] . Furthermore, the process of aggregation of bone marrow aspirates is a painful process and therefore other beginnings are preferred. As such adipose tissues have been identified as a beginning from which adequate chondrogenic primogenito r cells can be obtained at initial crop for research lab and clinical usage. It besides provides us an advantage of insulating adequate cells in a short sum of clip during tissue civilization enlargement. Adipose Stem Cells ( ASCs ) have the similar distinction potency, morphology, phenotype and cistron look as MSCs, as demonstrated by several surveies and are considered as a better beginning of multi-lineage mesoblastic root cells for tissue technology in regard to their copiousness and handiness [ 6,43 ] . In decision, we know that there are multiple root cell reservoirs available for gristle TE research and clinical applications ; we should see utilizing the reservoir that is ( I ) available in a big volume with limited morbidity of the environing tissue upon crop ; and ( two ) accessible without or with the lowest sum of hurting. Furthermore the reservoir should ( iii ) clasp cells which are capable of distinction into chondrocytes, produce gristle seeded on biomaterial like scaffolds and ( four ) can be detected by simple research lab methods. In my sentiment adipose tissue provides us menus better in comparing in all the above characteristics. However, to go on to take advantage of ASCs for gristle tissue technology and its applications we require a complete apprehension of how the care and distinction of ASCs are regulated both in vivo and in vitro. Though it is considered to hold greater possible and can be developed as a suited option to cram marrow, farther surveies in clinically relevant animate being theoretical accounts are needed for better proof. Besides regulative issues and safety facets should be addressed exhaustively in presymptomatic and clinical scenes. Standardization of protocols and sooner automated devices for isolation of ASCs need to be pursued with a proper set of surface markers to verify the presence of the right ASCs cells within the primary cell isolate. Future developments in biomaterial for scaffolds and bioreactor design for cell civilization will take without uncertainty to new vehicles for the bringing of ASCs to cartilage defect sites. Besides the development of optimum conditions such as h ypoxia and appropriate biophysical cues, hydrostatic force per unit area and hyperosmolarity for in vitro cultivation can further increase the chondrogenic committedness and the ability of these cells to intercede the coevals of de novo gristle tissue.

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