Music of the Century Essay Example For Students

Music of the Century Essay He studied with Guard and others at the Paris Conservatoire and as prizewinner went to Rome, though more important Impressions came from his visits to Bayreuth and from hearing Javanese music in Paris. Debussy and Impressionism The Impressionist style of painting developed in the late 19th century in France. Although the Impressionist movement did not exclusively consist of French artists, it did start in France and the French painters are among the most well-known. Several earlier artistic movements, such as Classicism and Realism, influenced the Impressionist painters. In 1855, a World Fair was held in Paris, and art was given significant attention. This contributed to Paris reputation as the center of the art world and the place to be for aspiring painters, such as the group that would come to be known as the Impressionists. Impressionism is a style borrowed from painting which creates an illusion of light and atmosphere by using colors side by side instead of blending them. The artist avoids realism in favor of conveying impressions. Nocturnes Achilles-Claude Debussy, 1862-1918, Nocturnes. Completed December 15, 1899 (at 3 a. . , according to an inscription on the manuscript), first performance October 27, 1901, in Paris. Scored for 3 flutes, 2 oboes, English horn, 2 clarinets, 3 bassoons, 4 horns, 3 trumpets, 3 trombones, tuba, cymbals, snare drums, tympani, 2 harps, female chorus, and strings. 3 Shorts Composition of NOCTURNES 1 . Engages- (Clouds) Debussy pictures the sky with slow and melancholy passages of clouds. The warmth of Engages recalls a summer love affair. . Fetes- (Festivals) is a restrained yet Joyous celebration, the sort that generates lifelong memories without ever disturbing the neighbors. . Sirens- (Sirens) builds on a simple two-note motives to seduce the listeners into Debussy river, Just as dangerously as the mythological beauties who have lured innumerable sailors to their doom over the centuries. Music of the 20th Century By Princesses Bell Bartok (1881-1945), a Hungarian, is considered a famous progressive modern musical composer, a great pianist, teacher and researcher. He was one of the leaders of Hungarian nationalism and made use of the Hungarian folk tunes in his music. Just like Stravinsky, he was one of the composers who belonged to the movement of Neo-classicism: a return to the simplicity of Classicism and combining of modern sound with classic form. His style is characterized by rhythms which are percussive and intricate because of the influence of the Hungarian dance patterns. He used polymath, which means using two or more different rhythms played at the same time. In some of his compositions like Six Dances in Bulgarian Rhythm, no. , you will notice the irregular grouping of beats. Polytonally, which is the simultaneous combination of two or more tonalities in a composition, can also be found in Brooks compositions. Antonio Moline and Impressionism Dry. Antonio Moline (1894-1980) was one of the 20th century composers who wrote art music. He was considered the Claude Debussy of the Philippines because he was the first to introduce several important devices, technically characteristics of impressionism in music. One of Millions popularly known, compositions is Hatchings. Another composition of Moline is Dancing Fool. In this composition, he made use of the whole tone scale and used it as a descriptive device. Schoenberg and Expressionism Arnold Schoenberg (1874-1951) Austrian composer, Schoenberg development of the twelve-tone method of imposition was a turning point in the 20th century music. He was a self taught musician. Another philosophy of art which affected the music of the 20th century is expressionism. It is a style which seeks to express emotion with exaggerations rather than represent the physical world. The followers of the movement believe that this world is full of tension, and people are irrational, rebellious and scared to be alone. Expressionism Many of the 20th music reflects an artistic movement called expressionism, which stress intense and subjective emotion. Painters, writers, and composers explored inner feelings rather than depicting outward appearances. The expressionists Arnold Schoenberg was known for the radical sound of his music. In this song cycle, Peppier Linear, he made use of different style of singing which is called Springtime. .u1d1f9a8e3156b54ec3b1dbe081c207d9 , .u1d1f9a8e3156b54ec3b1dbe081c207d9 .postImageUrl , .u1d1f9a8e3156b54ec3b1dbe081c207d9 .centered-text-area { min-height: 80px; position: relative; } .u1d1f9a8e3156b54ec3b1dbe081c207d9 , .u1d1f9a8e3156b54ec3b1dbe081c207d9:hover , .u1d1f9a8e3156b54ec3b1dbe081c207d9:visited , .u1d1f9a8e3156b54ec3b1dbe081c207d9:active { border:0!important; } .u1d1f9a8e3156b54ec3b1dbe081c207d9 .clearfix:after { content: ""; display: table; clear: both; } .u1d1f9a8e3156b54ec3b1dbe081c207d9 { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u1d1f9a8e3156b54ec3b1dbe081c207d9:active , .u1d1f9a8e3156b54ec3b1dbe081c207d9:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u1d1f9a8e3156b54ec3b1dbe081c207d9 .centered-text-area { width: 100%; position: relative ; } .u1d1f9a8e3156b54ec3b1dbe081c207d9 .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u1d1f9a8e3156b54ec3b1dbe081c207d9 .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u1d1f9a8e3156b54ec3b1dbe081c207d9 .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u1d1f9a8e3156b54ec3b1dbe081c207d9:hover .ctaButton { background-color: #34495E!important; } .u1d1f9a8e3156b54ec3b1dbe081c207d9 .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u1d1f9a8e3156b54ec3b1dbe081c207d9 .u1d1f9a8e3156b54ec3b1dbe081c207d9-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u1d1f9a8e3156b54ec3b1dbe081c207d9:after { content: ""; display: block; clear: both; } READ: River Flows in You Musical Analysis EssayPeppier Linear calls for unusual style of vocal performance halfway between speaking and singing. Springtime Literally it means speech voice. It is a manner of performing a song which sounds half-sung and half-spoken. Millimeter is identified, by the time signature, a fractional symbol in which the numerator specifies the number of beats per bar, and he denominator specifies the relative note value assigned to one beat. Syncopation (Accent) the suppression of an expected rhythmic accent by the continuation of an accented tone that begins Just before it. The Music of Stravinsky Igor Stravinsky (1882-1971) A Russian composer, later of French (1934) and American nationality. Stravinsky was regarded as the worlds greatest composer. His once revolutionary works were modern classics. Like Debussy and Schoenberg, Stravinsky a composer from Russia, was also one of the 20th century composers who established new trends in music, instead of Just sing the new trends in his music, he combined the traditional and modern trends. Electronic Music Music that requires knowledge or use of electronic devices to produce or manipulate sounds during its composition and performances. With the advancement in technology, many composers are experimenting new sound sources such as electronic, environmental and other non-tonal sound. Traditional instruments are used but in different way. Even computers, cassette tape recorders, and synthesizers are used. Concrete Music Music created by reworking natural sounds recorded on discs or tapes. Filipino Contemporary Composer Anchor Bollard (1893-1934)- Our foremost Kinsman composer also showed the elements of modernism in his music. This is heard in his Cinderella Overture and Assassinate for Strings Dry. Lucre Silage (1918-)- Neo-classicist. The music of Silage is unique in which she was able to combine the music of the east and west. This is shown in her Toccata (1958) were she made used of the piano, clarinet, oboe calculating and tiara. The Guillotining is very prominent in her Concert music in our country. When he was in France, he Joined the Music Concrete movement. An example of his work is Most of Macadams composition aka use of a large number of people and the environment.

Defense Mechs In Lit Essay Example For Students

Defense Mechs In Lit Essay Who hasnt been hurt if their life? A loved one passing away, a lover tearing at the heart, a rejection of something desired. Everyone has certain stresses in which they have to deal with and react to. As the burden of the stress mounts, certain levels of anxiety arise. How do humans behave in the depths of this anxiety? People have developed varied counter measures called defense mechanisms in an attempt to confront their issues. Many of the theories behind defense mechanisms commenced with the work of Sigmund Freud. Freud believed that a conflict existed between the id, ego and the superego. This accounted for the anxieties within human existence. Freud stated that individuals use these mechanisms subconsciously, and that it is normal and acceptable to do so. Yet a metaphorical line can be drawn. A line where if crossed can be damaging to ones psyche. It may cause the individual not to deal with the situation or problem, but rather to repress them. Thus damaging the individual or th ose around him further. The repressor does not deal with his feeling directly. He hides them. Directs them using the mechanism. I will examine the use of defense mechanisms in the context of two works explored in class. These are the movie The Fisher King and David Hwangs M. Butterfly. Both of the lead characters in each of these works use defense mechanisms to mask certain pains that have caused conflict. There are parallels and differences in the comparison of the two. The days coming to an end. Youve finished work and want some down time to unwind. So you get the wife and head out to eat. Sit down and relax for what should be an enjoyable evening. Yet, your serenity is obliterated, destroyed with the explosion of a gun. Parrys world is destroyed by the death of his wife in the Fisher King. He is committed to an asylum. When he leaves and enters the world again, his vision of reality is blurred. Parry develops a number of defense mechanisms in order to combat the war in his mind. Parry initially forms what is known as repression. This is the most commonly found defense mechanism. It is simply a repression of the memory. Basically, in essence, forgetting The repression of the memory is not permanent, however, as it is stored in the subconscious and can inflict the subject at any time. The stored memories can often times be violent to the subject and can lead to a blacking out period in which the subject will awaken with no memory. Parry endured what seemingly was a classic case of repression. He would not think of his wife in a normal sense. He did not look back at fond memories or at the time they had together. He simply tried to forget her. And when memories resurfaced, he displayed classic examples of repression. The violent outburst followed by a period of time where the memory would again be repressed until the next emotional upheaval. But perhaps the more intriguing defense mechanism employed by Parry is that of fantasy. Everyone has fantasies. But Parry creates a world, a fantastical vision of knights and demons and the Holy Grail. Within the movie this plays very well as allusions and metaphors can be played off Parry dementia. The actual memory of his wifes passing is that of a red fiery knight, coming to strike Parry. To hurt him. To destroy his world. There is a certain level of intimacy one achieves with the member of the opposite sex. Could it be possible to be that intimate for a number of years and not to realize a shocking truth? A reality that while one might not want to grasp has to be visibly apparent. I am referring to M Butterfly. An adaptation of a play by David Hwang. Gallimard simply does not comprehend that Song is male. He sees her as the epitome of feminism. Whilst all the while, she is obtaining secrets that will later condemn him. .u7b0b398e0bdab0663f7f8ef02ec5b15b , .u7b0b398e0bdab0663f7f8ef02ec5b15b .postImageUrl , .u7b0b398e0bdab0663f7f8ef02ec5b15b .centered-text-area { min-height: 80px; position: relative; } .u7b0b398e0bdab0663f7f8ef02ec5b15b , .u7b0b398e0bdab0663f7f8ef02ec5b15b:hover , .u7b0b398e0bdab0663f7f8ef02ec5b15b:visited , .u7b0b398e0bdab0663f7f8ef02ec5b15b:active { border:0!important; } .u7b0b398e0bdab0663f7f8ef02ec5b15b .clearfix:after { content: ""; display: table; clear: both; } .u7b0b398e0bdab0663f7f8ef02ec5b15b { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u7b0b398e0bdab0663f7f8ef02ec5b15b:active , .u7b0b398e0bdab0663f7f8ef02ec5b15b:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u7b0b398e0bdab0663f7f8ef02ec5b15b .centered-text-area { width: 100%; position: relative ; } .u7b0b398e0bdab0663f7f8ef02ec5b15b .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u7b0b398e0bdab0663f7f8ef02ec5b15b .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u7b0b398e0bdab0663f7f8ef02ec5b15b .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u7b0b398e0bdab0663f7f8ef02ec5b15b:hover .ctaButton { background-color: #34495E!important; } .u7b0b398e0bdab0663f7f8ef02ec5b15b .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u7b0b398e0bdab0663f7f8ef02ec5b15b .u7b0b398e0bdab0663f7f8ef02ec5b15b-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u7b0b398e0bdab0663f7f8ef02ec5b15b:after { content: ""; display: block; clear: both; } READ: Pastoralism EssayGallimard displays a variety of defense mechanisms. But these are encountered for reasons polar to Parry. While Parry mechanisms were designed to mask an event of the past, Gallimard uses his to hide the truths of the present. I also theorize that Gallimard used his defense mechanism to hide the actuality that he was homosexual (I read something to the effect in a magazine article where the actual subject of the play admitted as much) Gallimard presents a classic case of what Freud coined denial. The subject does not want to accept the realities of a situation, so rather he just pretends they do not exist. Gallimard simply is in denial that his precious fl ower could be anything but female. He is a man; she is a woman, a submissive concubine to him. Actions taken within the beginning of the work where Song gives Gallimard her shame plays right into this deception. It gives Gallimard a masculine feeling of superiority. Gallimard also shows distinct signs of rationalization. This mechanism allows the subject to find excuses for their behavior. Gallimard is the man. He has been with his Song on numerous occasions. He rationalizes that she is the epitome of feminism. Submissive, Loving, the perfect feminine specimen. Even his culture subscribed to the domineering position of a man over his concubine. This cultural hegemony displayed the east as womanly, thus increasing his rationalization of the belief of Song being a woman. On a second level, one could subscribe to the belief that, in fact, Gallimard was homosexual, and used his defense mechanisms to cloak this reality. He could have created Song as a quasi fantasy. The ideal of a woman in a body of a man. He would not have to consider the ideal of himself being homosexual while at the same time having been allowed to be one. Many parallels can be drawn between the defense mechanisms of each of these characters. Both are trying to hide an undesirable characteristic. Both create a world for themselves that is unlike reality. Song becomes the feminine character whom is not what as she appears. She is Gallimard fantasy of what a woman should be. Parry simply creates a total fantasy world where much is not as it appears. Parry lives within a land of Knights and Holy Grails. Each of the characters seems to have differing motives for their defense mechanisms. Parry has memories. These memories haunt and torment him. He wants to hide these memories. Ergo, he represses these memories in order not to dwell on the pain. Gallimard is denying something in the present. He does not want to see Song for what she is. He uses the mechanism of denial either to disguise the appearanc e of his loved one as male, or just maybe to deny the actuality that he might differ from the cultural norms of the time. Each of us has hidden pains, worries or torments. Probably each of us uses certain defense mechanisms in order to combat these. Yet, when one cannot decipher realities from fantasy the mechanism become counter productive. In Gallimards case he passes on secrets to his love. Only to learn of her deceit at his fall. The fantasy is the rationale behind the delving of the secrets. The fantasy leads to his jailing. While the Fisher King concludes with the typical Hollywood ending, Parrys mechanisms still cause danger to himself throughout the movie. The fantasy world in which he lives in does not deal with the feelings that live deep inside him. The torment is still there. It is just not apparent. He is seen as the crazy bum. He is a man in pain

Study of Juliets Charachter in Shakespeares, Romeo and Juliet Essay Example

Study of Juliets Charachter in Shakespeares, Romeo and Juliet Essay Romeo and Juliet is a tragic play created by the well-known writer: William Shakespeare. He was a play wright and poet born in Stratford-upon-Avon on April 23rd. Shakespeare was born in 1564 and died in 1616. He had 4 children, twins, Suzanna and Judith, and a son, Hamnet. The dramas Shakespeare devised were mainly comedies happy endings, tragedies tragedy and death or histories historic interpretations of peoples lifestyles. His exquisite plays were set in the Globe theatre, but it was later burnt to the ground by puritans; they were thought to have burnt down the Globe theatre because they objected to the singing and music that Shakespeare encouraged his actors to perform. Some of the well-known plays William wrote were, Hamlet, Tempest, Macbeth, A Mid Summer Nights Dream, and of course the legendary Romeo and Juliet. In my essay, I will be focusing on Romeo and Juliet, it is a tragedy with two lovers that intend to marry, but fatally there crude plans are deformed by the war between the Capulets and the Montagues. They were two families that hated each other for a reason forgotten, but because it was carried on throughout there lives, the two oppositions decided to continue the inevitable frenzy. I will concentrate on the ways in which Juliet portrays every aspect of her personality. At the beginning of the play Juliet is perceived to be a quiet, well-mannered daughter of Lady Capulet. She lives with her parents in a mansion and was brought up by a very outspoken Nurse. In the play the Nurse has an excellent relationship with Juliet as she brought her up and treated her like her own daughter. The Nurse is a very sincere woman that worries for Juliet throughout the catastrophic story. We will write a custom essay sample on Study of Juliets Charachter in Shakespeares, Romeo and Juliet specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Study of Juliets Charachter in Shakespeares, Romeo and Juliet specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Study of Juliets Charachter in Shakespeares, Romeo and Juliet specifically for you FOR ONLY $16.38 $13.9/page Hire Writer Her parents, Lord Capulet and Lady Capulet are not very close mitten with Juliet and in one part of the play; Juliets mother actually can not recall her daughters age. The Nurse and Juliet have a very close bond so whenever Juliet needs someone to talk to she turns to her Nurse. She is dependable on her parents guidance, as that is the only time she can engage with them in conversation, and she respects and values her mother and father very well. As the play progresses, Juliet becomes more independent and doesnt rely on her parentage to supply her with right decisions, she begins to think for herself and fend for herself. This leads to the young Capulet transforming into a respectable young lady. Juliet appears to be rather perceptive. In Act One, Scene three, when Lady Capulet is talking to her daughter about the near future, she seems to be lacking directness. Juliets mother is passionate about her daughter marrying yet she avoids the suggestion at first. Before she asserts her wishes, the young Capulet states, It is an honour I dream not of when asked about marriage. Juliet seems to second guess her mothers intentions she realises the true purpose of Lady Capulets visit. And so she explains her point of view, discreetly, by seeming quite unmoved by wedlock. In this scene, Juliet and Lady Capulet do not seem to be very close. This is showed incredibly well. Juliet is in her room, when she is called upon by her mother. Lady Capulet comes to see her daughter to ask her about the social status of matrimony. Juliet curiously says How now, who callsthis suggests that Juliet doesnt get muchvisits. Juliet has a very diverse relationship with her mother to that of the Nurse; they have no maternal bonding or connection that a normal mother and daughter would usually have. We know this because when the Nurse says Your mother Juliet responds very formally and replied: Madam, I am here, what is your will? This response shows Juliet feels she has to put on a mask to cover any impolite or inaccurate gestures in speaking to her mother; and from this line we are given the indication that there is no affection between the two relatives. The relationship is very distant because when the Nurse asks Lady Capulet how old Juliet is she does not know. Even tho ugh they are not very close, Juliet respects and values the views of her mother, because she is open minded when she is asked about nuptials. A sense of fairness, along with a polite approach, is demonstrated by Juliet. As a way of Juliet meeting her suitor, Paris, Lady Capulet has organised a ball for this to happen. The young Capulet has a duty to introduce herself to the bachelor. Juliet responds by saying, Ill look to like, if looking liking more Firstly, Juliet is following her mothers will. In agreeing to do this, she is respectful of her parents. Secondly, Juliet is fair because she is not closed to the opportunity provided, in other words, she is an open minded young lady. Throughout Act One Scene Three, Juliet is seen to be both clever and deceitful. When the Nurse is talking too much Juliet shoes a completely different side to her polite, well-mannered usual profile. While the nurse is showing her enthusiasm on the topic, she is interrupted when Juliet says And stint thou too, I pray thee, Nurse, say I. Juliet shows how intelligent she can be by disguising the disrespectful way she spoke to her Nurse to spare her feelings by saying I pray thee This also shows how deceitful young Juliet can be because she successfully manages to alter the perception of her impolite behaviour towards her guardian. The way Juliet reacts to different situations changes repeatedly right through this scene. At this time and moment Juliet is demonstrating her respect and loyalty towards her mother. Lady Capulet is sceptical until Juliet says, Your consent gives strength to make it fly when asked about meeting Paris. Juliet does not make her own decisions and is dependant on her parents. I know this because she says she will only try and like him because her parents want her to. She doesnt argue with her mother, she immediately says yes, without hesitating, this shows that Juliet can be easily manipulated. Juliet can be seen to be both immature and open minded. When Juliet is questioned about getting married to a man she has never met, she is open to the suggestion. She says Ill look to like, if looking liking move. In other words, she will look at him and see if she likes him and if she admires his appearance, she might give Paris a chance. She is amateur because she is going to judge Paris on his physical appearance. The way in which Juliet is open minded is because she says to her mother that she is willing to participate in the party and see if the bachelor lives up to the expectations that the Nurse described to her. The party begins, but soon enough gate crashers arrive, the Montagues, Juliet sees Romeo and he catches her attention. She falls for him because he is wearing a mask, and she is intrigued. When Juliet converses in chatter with Romeo for the first time, she seems to be pious, quick-witted and loyal. Romeo and Juliet are in the Capulets hall in the mansion and they meet for the first time. When Romeo suggests, O then, dear saint, let lips do what hands do: They pray grant thou, lest faith turn to despair. Juliet reacts quickly with an excellent alibi, saying: Saints do not move though for prayers sake. She defends herself with religion showing she does not want to take her infatuation any further, staying faithful to her parents wishes. Clever Juliet uses excuses rapidly as a barrier separating herself from Romeo, whereas in Act One Scene Three, she was slow understanding things. Now, she knows she must listen to Romeo and reply quickly; to ensure nothing happens between them and to continue to be true to her mothers dream; thus explaining her fast, well-informed justifications. Juliet reveals the inconsiderate, doubtful part of her nature. Romeo and Juliet show their fondness of each other by kissing. Romeo kisses Juliet after Juliet was protesting why they should not kiss. After they share their first kiss, Juliet says, Then have my lips, the sin that they have taken. The kiss between the two lovers is described by Juliet as a sin. Significantly, this shows Juliet thinks the kiss stole a portion of her purity, making her less holy. Calling the kiss a sin makes Juliet appear inconsiderate of other peoples feelings. Romeo could have been hurt by the way Juliet expressed the kiss. The young Capulet feels guilty about what she has done. She believes she has made mistake by choosing to kiss Romeo. Yet she still kisses him again. The challenging character can be very doubtful at times, but still goes ahead with any problems she has to face. In Act one Scene five, Lady Capulets outgoing daughter, Juliet, is seen to be demanding -like her mother- disloyal and immature. The Nurse and Juliet are standing by the door watching the eager guests departing as the party is over. The gathering that was supposed to being Paris and Juliet together, but was the ending of the possibility, as Juliet met her star crossd lover. Juliet eagerly states Go ask his name. If he be married. My grave is like to be my wedding bed. She inherited her bossy, demanding behaviour from her mother. She sends the Nurse away, as if it is the Nurses duty to carry out all the jobs Juliet wants to be done. Juliet tries to act like her mother, although she unsuccessfully mirrors her mothers personality. The immaturity of her frame of mind shines through as she explains that she will die unmarried. This shows Juliet is desperate to find a partner so that she will not die unmarried. Whereas in Act one Scene three Juliet exclaimed marriage as an honour I dream not of. She has changed her mind again, and is also being disloyal to her mothers wishes by instructing the Nurse to ask his name. Again she is acting in the opposite way that she carried herself in Act one Scene three. In Act one Scene three, Juliet was respectful of her mothers wishes and was open minded to look to like, if looking liking move. You begin to recognise that Juliet is naà ¯Ã‚ ¿Ã‚ ½ve and desperate throughout this scene. Juliet is standing by the door with the Nurse; the Nurse tells Juliet finds out that her true love is a Montague, her worst enemy. When Juliet finds out that Romeo is the son of her greatest enemy, she is saddened by the horrific idea and says, My only love sprung from my only hate. Too early seen unknown, and known too late. This gives me the impression that Juliet can be very naà ¯Ã‚ ¿Ã‚ ½ve, because her family enforce the idea that she should hate the Montagues, and that is the only reason she hates them. Showing she is just a follower of what the majority of people are doing. She looks like she is desperate at the fact that she feels fooled and devastated for Romeos true identity. Without questioning the Nurse she believes what has come out of her mouth straight away. Juliet now believes that she does not stand a chose of being with her soul mate. During the whole of Act One Scene three Juliet was loyal to her parentage, respectful and was very dependant on her parent. When she had to make decisions she turned to her parents to help her decide. She acted her age, thirteen. Her upbringing was by the Nurse so she was more close to her Nurse than her mother. In Act One Scene Five, we begin to see a more mature Juliet that made her own decisions. In this Scene Juliet had changed incredibly, she made her own choices and did not rely on her parents for anything. She is more demanding towards to the Nurse and others around her. In Act One Scene Three Juliet winces at the word marriage, now she is ready to have a relationship and even get married. I believe Juliet shows her real personality in Act One Scene Five because she is not relying on anyone anymore so she can express her views freely, whereas in Act One Scene three Juliet kept her self to her self and was depended on her Mother and Father.

Writing a College Board AP Lit Sample Essay

Writing a College Board AP Lit Sample EssayWriting a college board AP Lit sample essay is not a hard thing to do. But, it is not the easiest.In writing an AP Lit essay you must pay special attention to the details. And remember, they are the things that will help determine whether or not you get a credit or a failing grade. In order to learn about the information that you need, the first thing you should do is to research the subject matter.First of all, you don't need to know all of the answers to the essay's questions. As long as you have an idea of the kind of questions they are going to ask you are in a good position. It would be good if you had an idea of what the college is looking for. In addition, you should know why they are asking the questions.This is the time to really think about what your reasons are for the type of essay you want to write and how your knowledge and background will help you answer the questions. If you have no idea how to answer the questions then you w ill not be able to write a good college board AP Lit sample essay.Second, you will also need to consider what kind of college board AP Lit sample essay you will be asked to write. Some college boards have specific AP Lit essay questions. Others are going to ask you to write on a variety of topics.Knowing what the type of essays they are writing will help you see which ones are going to be very specific to the work they are looking for. You will need to prepare yourself to write on subjects that interest you. If you know the type of essay they are looking for, then you will be prepared to answer their questions.When you have an idea of the kind of material that you need to think about, the second thing you should do is to plan ahead. You will want to write a college board AP Lit sample essay that you can really get excited about so that when the time comes to write the essay, you will be ready to do it.The next thing you should do to prepare for writing a college board AP Lit sample essay is to get plenty of practice. You should spend some time doing a number of different essays. Be sure to take the time to be able to answer a question.

Assessing the Endodermal Differentiation of Humans Essay Example

Assessing the Endodermal Differentiation of Humans Essay Example Assessing the Endodermal Differentiation of Humans Essay Assessing the Endodermal Differentiation of Humans Essay Stem cells are the promise of new skylines in the field of medical specialty with wholly new attacks into how adult male looks at diseases and their remedy and besides promises some penetration and apprehension of cells and cell rhythms. When sperm and ovary cells come together, they form the fertilized ovum, which has the possible to go the full being. This fertilized ovum undergoes farther divisions and becomes blastocyst ( 32 cell phase ) and so the gastrulocyte ( 64 cell phase ) 90 yearss into gestation. It is at this phase that the cells differentiate and make up ones mind their destinies. The cells harvested from these phases are known as Human Embryonic root cells. ( 1 Evans and Kaufman,1981 ; 2Martin et al.1981 ) together with their developmental potency in vivo, ES cells besides show the capacity to organize differentiated cell types in civilization ( 3 Keller 1995 ; 4Smith 2001 ) . These have the potency of going any type of cell in human organic structure. Some of these cells merely proliferate and do non distinguish, therefore staying unchanged throughout the lifetime of a human being, and assisting in regeneration, and replacing of dead cells and fix of damaged tissues. The two most important inquiries addressed by the scientists today are, The ability of root cells to proliferate for periods more than a twelvemonth without undergoing distinction in research lab conditions, The assorted factors involved in ordinance of root cell proliferation and distinction and ego reclamation. Stemness The cells can be classified as root cells by their unique belongingss which are jointly called as stemness of a cell. They include the followers: They are unspecialized, which means that they lack specific programming taking them to developing into a specific line of descent and therefore hold the capableness to go any signifier of cell. This means that they can retroflex themselves umteen figure of times without undergoing distinction into any specific signifier of cell and can proliferate in the beings for old ages together. This is the premier cause for ego renewacan assist us understand the basic mechanisms indies and can besides check the grounds behind dysfunctioning of cells in instances like malignant neoplastic disease. foremost found in mouse ( Bradley et al. 1984 ) when they were induced into host blastodermic vessicles, they generated all types of cells. With this it was besides proved that they can be used to bring forth assorted difffentiated cell types in civilization by ( Keller 1995 ; Smith 2001 ) . From so on there has been a batch of attempt to standardise assorted protocols and better the efficiency of distinction. Further when hEScs were isolated for the first clip in 1998, ( Thomson et al. 1998 ) a batch of hope was generated on the practicalities of hESC based therapies. Depending on their varied abilities stemcells can be classified into the followers: Totipotent root cells: these can distinguish into any type of cell in the human organic structure. Pluripotent root cells: these are derived from totipotent root cells and after several yearss, can distinguish into any type of cell except for totipotent root cells. Multipotent root cells: these descend from pluripotent root cells and can distinguish into many cell lines within a specific type of tissue. Unipotent root cells: these are the posterities of multipotent root cells and can give rise to a individual cell type. Benefits of Stem Cells Stem cells are presently used to handle malignant neoplastic diseases such as leukemia. You may be familiar with the construct of bone marrow grafts, which have been used for decennaries now to supply a healthy beginning of cells in the organic structure. Other diseases that stem cells may assist include Parkinson s disease, Stroke, Spinal cord hurts, Retinal diseases, Alzheimer s disease, and Type I diabetes Human embryologic root cells are highly powerful interms of their curative value, since they are derived from early blastodermic vessicle phase and have the possible to be differentiated into 220 different cell types. As assorted techniques have been found to better the present techniques and their efficiencies by bettering the figure of attendant differentiated cells and diminishing the figure of contaminations, the hope on usage of stemcells is bettering. There are a batch of ethical contentions environing the usage of root cells, their maintainance and deducing them from embryos, together with immune rejection which is a major concern addressed by the scientists. The processs have to be standardised and the efficiency has to be increased. Stem cells can potentially in the hereafter be extensively used in conditions like malignant neoplastic disease, and birth defects ensuing from dysfunctional cell reproduction and specialization. Lack of public credence and proper authorities policies to back up human embryologic root cell research is another hindrance for more research work in the field. Figure 1 demoing the 10 to 12 twenty-four hours embryo phases, phases in which the blastosphere and gastrula phases are shown in which the endodermal differention occurs Clinical Importance The assorted line of descents developed from the entoderm in an embryo are as follows: Figure 2 Shows the representation of assorted variety meats developed as end point to endodermal distinction in mouse Picture adopted from Stem Book Endodermal distinction in vivo Formation of unequivocal entoderm in the gastrulation stage of embryogenesis The endodermal precursors present in the epiblast move to the anterior crude run. ( Figure 2 ) The Definitive entoderm cells move from the crude run and acquire integrated into the splanchnic entoderm which finally leads to most of the extraembryonic tissues. Surveies show that different cells are mobilised by their neighbors in the procedure of endodermal gastrulation. Figure 3 Gastrulation phase The distinction of assorted endodermal line of descents and extraembryonic entoderm by the endodermal primogenitors in mouse. The figure shows the mouse embryo at 4.5 twenty-four hours phase. The three major beds of the embryo -primitive entoderm, inner cell mass and trophectoderm undergo gastrulation and the procedure initiates the crude run, motion of the epiblast cells and coevals of assorted excess embryologic beds. The endodermal specification is still non clearly understood. In mouse it was found that crude run has to be initiated for the endodermal distinction. to happen. ( Kimura et al. , 2006 ) But in more crude species, endodermal distinction occurs before gastrulation. Endoderm derived functions Invivo The most clinically important of all endodermal derived functions, ? cells and hepatocytes are the most focussed in the root cell biological research of the past two decennaries for the obvious grounds of really high clinical importance. These in vitro engineered cells can be possible remedies of Type I Diabetes and liver disease. There are assorted cistrons which have been used to tag endodermal derived functions Foxa2, Gata4, Sox17, ? foetoprotein, albumen, Pdx1 and insulin. These markers are besides found in the splanchnic entoderm line of descents, which are really the extraembryonic entoderms, but are derived from the same primogenitors. Therefore due to most of these signals being present in both, it s difficult to distinguish them at the cheque point times as to whether they would distinguish into the endodermal signifiers or to the splanchnic entoderm signifiers. But there are some exclusions like the nanog, GATA-4, GATA-6 which play a major function in the distinction, which need to be justly regulated as per some surveies. Absence of Nanog and overexpression of GATA factors would take to formation of Visceral Endoderm. ( Mitsui et al. 2003, Fujikura et Al. 2002 ) . This fact makes distinction of hESCs into unequivocal entoderm tricky and calls for farther probes to understand the molecular mechanisms involved. There is another built-in job, which is that there are no specific factors which can can entirely distinguish the unequivocal entoderm. But, the scientists have been successful in bring forthing endodermal tissues. These include pancreatic islet cells ( Colman 2004 ; Stoffel et Al. 2004 ) , hepatocytes ( Hamazaki et al. 2001 ; Jones et Al. 2002 ; Yamada et Al. 2002a ) , thyrocytes ( Lin et al. 2003 ) , lung ( Ali et al. 2002 ) , and enteric cells ( Yamada et al. 2002 ) . Molecular mechanisms of endodermal distinction Assorted signalling tracts involved The cistron regulative mechanisms involved in the endodermal distinction have been dissipated in Xenopus, ( Davidson et al. , 2002 ; Davidson et al. , 2002 ; Loose and Patient, 2004 ) and zebrafish Stainier, 2002 The TGF?s Nodal, Gdf1 and Gdf3 are endoderm inducers in craniates Henry et al. , 1996 ) did surveies which showed that Vg1 and/or Xnr s are endogenous endoderm inducers. They used the negative activin receptor to barricade Activin, Vg1, and nodal-related proteins. Further surveies ( Agius et al.,2000 ; Dougan et al. , 2003 ; Schier et al. , 1997 ; Thisse et al. , 2000 ) proved that nodal signalling plays a polar function in endodermal and mesoblastic cell destinies. Another survey shows that the endodermal tissue is lost in embryos by the mutants in Nodal proteolytic activation site or Smad 2 and 3 signals are reduced. ( Ben-Haim et al. , 2006 ; Dunn et al. , 2004 ; Liu et al. , 2004 ; Lowe et al. , 2001 ; Norris et al. , 2002 ) . Lefty 2 is known to be involved downstream of Nodal moving as a represser, since higher concentrations of Lefty2 leads to excess endodemal formation. Further downstream GDf1 or 3 is involved in go throughing on the Nodal activity as they form heterodimers and signal at broader scopes. ( Tanaka et al. , 2007 ) Positive feedback mechanism of Canonical Wnt tract, GATA factors and Nodal signalling Nodal and ? catenin are straight involved in formation of the crude run. ( Conlon et al. , 1994 ; Huelsken et al. , 2000 ) . Many Wnt cistrons are found to be expressed in blastosphere and gastrula phases. ( Kemp et al. , 2005 ) . Wnt 3 is known to be expressed in Visceral entoderm and proximal epiblast in the gastrula. Both these signals activate each other. ( Ben-Haim et al. , 2006 ) These signals interact with each other locally, i.e Nodal stimulates Wnt locally in anterior crude run cells. The other factors involved in this tract are FoxH1 which binds at the FAST binding site nowadays in Nodal regulative part ( Hoodless et al. , 2001 ; Norris et al. , 2002 ; Yamamoto et al. , 2001 ) . Another protein which is involved in the procedure is Cripto which interacts straight with Nodal and Alk4. Another survey shows that Cripto bints to Wnt11 and activates A ; szlig ; -catenin ( Tao et al. , 2005 ) . The endodermal distinction is influenced by two different positive feedback loops one after another. A mathematical theoretical account generated shows that the cell choses either mesoblastic or mesendodermal destinies depending on the clip it and it s precursors are exposed to Nodal signalling, than really the concentration of Nodal as shown in old surveies. This is in footings with the fact that Nodal plays a polar function in dorso-ventral axis specification. The GATA factors There have been many written text factors identified which act downstream to assorted signal proteins straight responsible in endodermal distinction. Most GATA household members act downstream to Nodal. There are the forkhead written text factors, or the FoxA household of proteins which take forward the signals from the GATAs. Out of the GATA household of proteins, GATA 4 and 6 are known to play of import function in entoderm and mesendodermal formation, whereas GATA5 is non greatly conducive as tested in a smasher mice experimentation. ( Reiter et al. , 1999 ) . These cistrons besides activate functional factors involved in grownup endodermal tissues like hepatic atomic factor 4/HNF4, stomachic H+/K+ ATPase, etc. Figure 4 Interactions between assorted signalling tracts involved in Endodermal distinction Forkhead factors ( Class FoxA ) and their function in endodermal distinction FoxA2 is known to be active in the early gastrula stage and is seen to be positive for bow and midgut parts. FoxA1 and FoxA3 are involved in endodermal distinction, but their absence merely decreases the per centum of endodermal development doing them non-compulsory factors. ( Ang et al. , 1993 ; Dufort et al. , 1998 ; Sasaki and Hogan, 1993 ; Weinstein et al. , 1994 ) . These factors are known to be regulated by T- boxes and Tcfs ( Davidson et al. , 2002 ) . Sox17 It is known to be expressed in Visceral entoderm and subsequently spreads to the excess embryologic VE. It besides expresses itself in Definitive entoderm. ( Kanai-Azuma et al. , 2002 ) Some surveies utilizing boosters show that TGF?s modulate Sox17 ( Howard et al. , 2007 ) Sox17 straight activates the endodermal cistrons HNF1? , FoxA1, FoxA2 and Endodermin, partly by the interactive interactions with ?-catenin ( Ahmed et al. , 2004 ; Sinner et al. , 2004 ) . The other endodermal cistrons are regulated by Mixer or by the interacting Mixer and Sox17 twosomes. ( Sinner et al. , 2006 ) Mix household It is chiefly expressed in the external beds of endoderm/mesoderm, and is capable of bring oning entoderm in specific. Mixl1 and BIx1/Mix4 induce the entoderm. ( Henry and Melton, 1998, Tada et al. , 1998 ) . It is by and large found to be present in splanchnic entoderm and in nascent crude run, and is absent in unequivocal entoderm. But another survey shows that overexpression of Mixl1 can do inordinate endodermal formation ( Hart et al. , 2002 ) . They are known to adhere to SMAD2/4 dimers in the activin antiphonal part. ( Howell et al. , 1999 ) . Differentiation of extraembryonic entoderm line of descents It is of import to analyze and analyze the excess embryonic line of descents since they are really similar to the unequivocal entoderms, and are driven by same Cascadess of factors and come from same primogenitors. Crude entoderm is known to be coming from the inner cell mass Weber et al. , 1999 and some other cells get attached to the base membrane of the inner cell mass and so go the splanchnic entoderm, some differentiate into the mesenchyme and are known as the parietal entoderm. Most of this is understood by the invivo analysis and by embryologic root cell distinction experiments. Crude entoderm Inner cell mass has assorted line of descents in itself and different type of cells can be identified by the assorted cell surface markers. Once the epiblast is formed with the crude entoderm there are a few phenotypic alterations which can be recognised ( Gerbe et al. , 2008 ; Plusa et al. , 2008 ) . Generally Pou5f1 is used to bring on crude entoderm and is noticed invivo in really high concentrations in the blastodermic vessicle phase. ( Niwa et al. , 2000 ) . The XT between assorted signals is evident in the inner cell mass in the blastodermic vessicle phase. Grb2, Fgf4 receptor 2 and Fgf4 is a demand for crude entoderm formation. In the embryoid organic structures, insilico some Fgf receptors prevent this formation. And these are regulated by the GATA factors, Gata6, and Gata4 Li et al. , 2004. These act downstream to the Fgfs and Fgfs are known repressers of Nanog. Hamazaki and Terada, 2003. The activation mechanism of Fgf is unknown but occurs in the inner cell mass. The crude entoderm besides comprises of the extraembryonic endodermal cells. Kunath et al. , 2005. There have been many cistrons identified specific to the crude entoderm. The cistron look analysis have identified the crude entoderm specific factors. But these surveies are done on civilizations developed on mouse embryologic fibroblasts and farther surveies have to be done to guarantee MEF derived factors do non back up these cistron look forms. Parietal entoderm Differentiation further from crude entoderm to either splanchnic or parietal entoderm is non to the full escavated. This procedure happens at E 6.5 7.5. ( Gardner, 1982 ) . The acceptance of parietal endodermal destiny is due to a composite cascade which is to the full non known, but in presence of host blastodermic vessicles, the splanchnic endodermal cells and crude endodermal cells undergo distinction to organize parietal entoderm. Exvivo surveies show that parietal entoderm is induced when GATA4 and GATA6 are over expressed. ( Fujikura et al. , 2002 ) . Sox7 acts downstream and induces the GATA factor. Parathyroid hormone-related peptide ( PTHrP ) produced by trophoblast cells and induces mesenchymal passage in crude entoderm. Veltmaat et al. , 2000 Visceral entoderm The distinction into the splanchnic entoderm is influenced by assorted written text factors, HNF4 Duncan et al. , 1997. It is expressed in the crude entoderm ( twenty-four hours 4.5 to 5.25 ) . Upstream to HNF4 is the BMP2 or the BMP4 and the activin receptor. With these HNF1? and Foxa2 are besides involved in the cascade of signals. ( Barbacci et al. , 1999 ) . Gata factors are besides portion of the cascade which includes GATA4 and GATA6 ( Morrisey et al. , 1998 ) . These factors are besides known to be modulating unequivocal entoderm and therefore are of significance. The assorted interactions between these factors are unknown and merely the assorted factors which may be responsible for distinction into peculiar line of descent are understood through the cistron look analysis. The mechanism of control of the cascade still remains a mystifier. The anterior splanchnic endodermal formation happens due to co look of HNF1? and Transthyretin. ( Torres-Padilla et al. , 2007 ) . ?-fetoprotein and Ihh are other factors which regulate splanchnic endoderm formation. Nodal is besides shown to be expressed by splanchnic entoderm. ( Mesnard et al. , 2006 ) . It acts as a downstream regulator for all the above mentioned factors. Wnt 3 is known to be expressed in the posterior part. Kimura et al. , 2000. Both Wnt 3 and Foxa2 with the Otx2 booster act downstream to HNF4 and besides act as negative feedback inhibitors of the Nodal tract, which leads to the posterior part transforming into the crude run. ( Perea-Gomez et al. , 2002 ) . Endodermal distinction in silico Introduction By add-on of assorted distinction factors, human embryologic root cells differentiate into the three source beds, entoderm, mesoblast and the exoderm. ( Keller 1995 ; Smith 2001 ) .By the initiation of BMP4, hESCs bend to tropoblast line of descents. ( Xu et Al. 2002 ) . There are three established methods to enduce endodermal distinction. Figure 5 Showing the three available schemes for distinction of embryologic root cells. Picture taken from They are as follows: The first method involves hESCs organizing embryoid organic structures ( Keller 1995 ) . This allows culturing in three dimentional scaffolds, but regular monitoring of cells and assorted factors produced by them is tough. Thus this method can non be used in experiments to find the molecular mechanisms of root cells, but with better monitoring and usage of bioprocess control methods, this can be applied in regenerative medical specialty to develop whole variety meats. The 2nd method by and large used is direct culturing on stromal cells. ( Nakano et al.1994 ) .This method provides all growing factors specific to the the specific stromal cell line used. But certain factors produced by these stromal cells can suppress the growing of hESCs and when choosing the cell line, it has to be ensured that there are minimum cell-cell interactions and it doesnt impact the involvements of the experiment concerned. Third method involves culturing hESCs on extracellular matrix proteins. ( Nishikawa et al. 1998 ) .This method gives an advantage that all the factors added are good known, and their functions in distinction is good understood. This besides avoids any cell-cell interactions. The choice of assorted excess cellular matrix proteins is really of import and depends on which end point cell line needs to be generated by the experiment. These proteins, their concentrations, and clip of exposure influences the type of cell lines generated and their endurance and maintainance. There are assorted factorswhich demand to be considered before choosing a peculiar method as the distinction protocol. The initial cell lines of hESCs used for distinction, The concluding line of descents desired, The selction schemes should take to high grades of distinction rates, The schemes should be expandible for many coevalss of cells lines, and repeatable without much alteration in distinction efficiency. The end point cell lines must be stable, and should expose appropriate maps specific for the cells and must besides be stable in the transplanted animate being theoretical accounts. The assorted protocols available and the efficiency degrees have been reviewed by Smith 2001. Out of all the above challenges, keeping the root cells for many coevalss and increasing the efficiency of distinction are the most boring 1s. There has been non a great trade of advancement in hESCs, but work on mouse theoretical accounts are really positive ( Pera and Trounson 2004, Schuldiner et Al. 2000 ) . Endodermal distinction through Activin or Nodal The distinction of Embryonic root cells into the entoderm is really self-generated but the efficiency is really low. ( Itskovitz-Eldor et al. , 2000 ) . The assorted experimentations done in early 2000 s to distinguish the clinically important line of descents did non take to any success, but helped in better apprehension of assorted underlying molecular mechanisms of endodermal distinction. ( Hamazaki and Terada, 2003 ; Jones et al. , 2002 ; Blyszczuk et al. , 2003 ; Vincent et al. , 2006 ; Yamada et al. , 2002 ; Yamada et al. , 2002 ) . Nodal is one of the premier signals required for endodermal distinction of hESCs. ( Gadue et al. , 2006 ; McLean et al. , 2007 ) . Since Nodal distinction work has been really recent and non really cost effectual, activin has been used as a addendum in early experiments with low serum, ( DAmour et al. , 2005 ) . Most civilizations generated have been on monolayers. ( DAmour et al. , 2005 ; Yasunaga et al. , 2005 ) . Efficiency of this method is known to depend on the root cell lines used. Lower concentrations of serum bounds the phosphotidyl inositol 3 kinase activity as shown by McLean et al. , 2007. The survey besides shows that MEF conditioned medium can besides supplement for Nodal. About 25 100ng/ml of activin gives 50-60 % endodermal tissues ( Gadue et al. , 2006 ) , but in lower concentrations would bring forth skeletal cells ( Kubo et al. , 2004 ) . The surveies besides showed effects of the sum of exposure and it takes about 6 yearss for markers like Sox17 and Hex to look a nd about 5 yearss for hematopoietic primogenitors to look ( Yasunaga et al. , 2005 ) . In a latest survey Achromycins are used to bring on Nodal supported endodermal distinction ( Takenaga et al. , 2007 ) . This new system is known to be more efficient than the activin driven system. But the ground behind this alteration in efficiency is non clearly understood since both have about similar mechanisms of action, except for for their station translational processing. Pancreatic development from ES cells There are two constituted protocols for distinction of pancreatic islet cells from hESCs. 1.The first one involves reassigning EBs from serum to a serum free media. Lumelsky et Al. ( 2001, and so trating with FGF and other factors. These cells produced insulin, glucagon and somatostatin. Although the concentrations were low and the cells formed bunchs. But this method was non consistent invivo and did non give positive consequences in mice theoretical accounts. After this, the protocol has seen assorted alterations. Some of them are, usage of Pax 4 written text factor Blyszczuk et Al. 2003, Pdx1 Miyazaki et Al. 2004, suppression of phosphoinositide 3-kinase by LY294002 ( Hori et al. 2002. After these interventions the end point differentiated cells the cells performed better in the mouse theoretical accounts to handle hyperglycaemic conditions. There are two nonallelic insulin cistrons, insulin I and insulin II ( Melloul et al. 2002 ) . While insulin I is expressed by -cells, insulin II is by and large expressed in the yolk pouch and developing encephalon in add-on to the pancreas ( Deltour et al. 1993 ; Devaskar et Al. 1993 ; Giddings et Al. 1994 ) . Since these modified civilizations contained neural cells, it can be explained that this lead to the remedy of hyperglycaemic provinces, and this was confirmed by the survey of Sipione et Al. ( 2004 Another survey besides shows that these pancreatic islet like cells absorb insulin into bunchs and within themselves and let go of them during programmed cell death. Rajagopal et Al. 2003 In a ulterior survey activin, exendin -4 and nicitinamide were used to bring forth pancreatic islet like cells which expressed Insulin I with high efficiency. Ku et Al. ( 2004 2. The 2nd attack for the coevals of islet-like constructions is based on development in heterogenous populations derived from hESCs after intervention with serum. ( Kahan et al. 2003This method like the old 1 has really low efficiency but has positive consequences. The attendant cells display most features of the pancreatic islet cells like look of insulin and hundred peptide but in farinaceous signifiers. Again these cells were non capable of supplying insulin for long footings to handle hyperglycaemic phases. A farther survey into this showed that Pdx1 is expressed in early phases of pancreatic development. ( Murtaugh and Melton 2003 ) . The survey besides showed that the organ is dpecified by the gut entoderm. The civilizations was established in G418 + media and were injected into hyperglycemic mouse theoretical accounts for 12 hebdomads and after 12 hebdomads the cell were seen to lose their functionality. Treatment with retanoic acid did non take to pancreatic cells but were endodermal which was proved by a cistron look survey. There have been contaminations in big graduated tables, particularly of the splanchnic entoderm line of descent, and even these cells are known to show pdx1. ( McGrath and Palis 1997 ) . This can be used as a selective marker to take for the differentiated cells. The experiments have besides been done on hESCs and like the mouse cell lines the efficiency is really low. ( Assady et Al. 2001 ) . Hepatocyte development from ES cells Hamazaki et al.,2001have generated a multistep protocol that includes specific growing factors in different phases of distinction taking to the hepatocyte like cells in the civilizations. A farther survey shows that they produce albumens. ( Chinzei et al. 2002 ) . These attendant cells were treated with 2-acetylaminofluorene in order to avoid proliferation of hepatocytes and were tested invivo in mice. Although really low figure, albumin bring forthing cells were detected about 4 hebdomads after injection. One of the surveies identifies cytochrome P450 as a liver specific cistron and this can be used as a distinction marker. Jones et Al. ( 2002 ) . It is besides found that it is non expressed in splanchnic entoderm. Another survey uses indocyanine green ( ICG ) as a marker of hepatocyte development in ES distinction civilizations. Yamada et Al. ( 2002a ) ICG-positive cells in civilizations could be separated easy as heatocyte like cells. This has been possible in human civilizations besides. ( Rambhatla et al. 2003 ) . To bring forth these cells, the civilizations were treated with Na butyrate, a process that killed important Numberss of the distinguishing population. The cells that survived this intervention gave rise to a population that displayed many characteristics of hepatocytes. Although the attack is assuring and consequences in the development of hepatocyte-like cells, the physiological relevancy of the Na butyrate intervention is ill-defined and can non be used in invivo experiments. The old research work in distinguishing hESCs shows some positive consequences and besides repeat the fact that the cells with features of pancreatic -cells and hepatocytes can be generated in helium cell distinction civilizations and the efficiency can be improved merely when extremely enriched primogenitors are accessible and different methodological analysiss for their coevals are defined and are tested in carnal theoretical accounts of diabetes and liver failure for long periods of clip. Molecular features which define Definitive entoderm Foxa2 and Sox17 are known to be expressed in most signifiers of line of descents of unequivocal entoderm as mentioned earlier. This is in add-on to assorted markers specific to assorted line of descents like Brachyury, Goosecoid, Lhx1, MixL1, PDGFR? and Wnt3a ( DAmour et al. , 2005 ; Gadue et al. , 2006 ; Kubo et al. , 2004 ; Yasunaga et al. , 2005 ) . Cxcr4 is known to be portion of the signalling cascade involved ( Yasunaga et al. , 2005 ) . Eomesendoderm is found to move upstream of Mixl1 in endodermal distinction. ( Izumi et al. , 2007 ) . There have been assorted RNA profiling and micro array analysis of assorted cistrons off late to understand this cascade wholly so that in can be reproduced in the research labs. Applications hESCs can be used as tools to understand basic inquiries in developmental biological science and can be used to work out assorted complex medical inquiries. These cells can specifically be used to understand cell destiny specifications, for illustration, the antero-posterior committedness of the unequivocal entoderm cells. They can besides be used as beginning for endodermal cells for biochemical or immunochemical assaies. The hESCs can besides be used to organize three dimentional scaffolds of peculiar endodermal tissues of involvement to analyze endodermal organ diseases. Endoderm regionalization and morphogenesis Assorted marker proteins identified show differed forms from entoderm to organ development. The place of the assorted endodermal primogenitors in the crude run shows their ulterior antero-posterior ( AP ) and medio-lateral place ( Franklin et al. , 2008 ; Lawson et al. , 1986 ; Tam et al. , 2004 ) . The entoderm at this phase can be divided into anterior and posterior countries. Homeo box cistrons are known to be expressed inhESCs ( Hesx1 ) ( Thomas and Beddington, 1996 ) are found merely in the anterior entoderm. It is besides found that anterior entoderm in the early phase with posterior mesoblasts induces posterior cistrons in the entoderm ( Wells and Melton, 2000 ) . The organ formation is driven by extra local signals together with the cascade of signalling which drives the endodermal distinction. Some of the escavated 1s are as follows: Fgf2 is found to be necessary for the development of liver and lungs which is produced by the cardiac anlage. Deutsch et al. , 2001, Serls et al. , 2005. Another factor found to bring on liver development is the BMP4 Rossi et al. , 2001. Another Fgf factor, Fgf10 is shown to play a function in assorted organ development including pancreas, cecum, lungs and tummy secretory organs ( Bhushan et al. , 2001 ; Burns et al. , 2004 ; Nyeng et al. , 2007 ; Sekine et al. , 1999 ) . It is frequently seen that modeling the endodermal cells derived from hESCs is really tough. Some old surveies show that activin goaded distinction coupled with little concentrations of the BMP and FGF ( Gouon-Evans et al. , 2006 ) . Retinoic acid and Fgf10 in absence of Shh leads to pancreatic development. ( DAmour et al. , 2006 ; Kroon et al. , 2008 ) . After distinction for twosome of times or at each transition, all these factors have to be looked for and it must be ensured that it is consistent through out the transitions. Applications of endodermal distinction Can be used to bring forth whole variety meats by utilizing root ce

Hans Hofmann in the Abstract and Nature Essay Example | Topics and Well Written Essays - 2750 words

Hans Hofmann in the Abstract and Nature - Essay Example The main concept behind abstract art is based on the idea that art is not static, but rather interactive with its audience and the political and social ideas of the audience's present as well as the symbols inherent in the particular forms used within the artwork. By reducing the recognizable forms, therefore, it becomes possible for the artist to attain a more pure expression in his or her creation. Jean-Francois Lyotard argues that avant-garde art uses experimental innovations in technique and structure to attempt "to make visible that there is something which can be conceived and which can neither be seen nor made visible" (Lyotard, 1997: 78). As an abstract artist, Hofmann was known as a synthesist because he brought together traditional methods and avant-garde concepts concerning the nature of painting, largely based on the works of Modern painters Cezanne, Kandinsky and Picasso's Synthetic Cubism. Because teaching dominated much of his creative life, his art was often critically measured against his theories. With his European sensibilities and his newly adopted American spirit, it needs to be remembered that Hofmann's work exemplifies a fusion of multiple aspects of 20th century art. A look into his biography reveals the development of his ideas regarding nature and abstraction while a glimpse into his career reveals how his teaching reflected this conceptual development. Biography Hans Hofmann was born in 1880 near Munich, Germany in a small city called Weissenburg, Bavaria. Growing up, he was surrounded by images of the past as his city still retained many remains of its ancient Roman past and of the countryside, with the closest large city being Ingolstadt more than 30 miles away. While this doesn't seem that far away to a modern audience accustomed to the use of cars to drive to the city every day from far off suburbs, Hoffman grew up in a time when the automobile was just springing to life. The first practical working horseless carriage was created in 1889 in Germany by Gottlieb Daimler and Wilhelm Maybach, when Hofmann was already 9 years old (Ament, 2005). It is possible that Hofmann had a chance to experience some of the technologies that were being developed in association with the automobile, however, because his father moved the family to Munich when Hofmann was just 6 when he took a job working for the government. "Hofmann developed an interest in m athematics, science, music and art at a very early age. When he was sixteen, his father helped him obtain a job with the Bavarian government as the assistant to the director of public works. During this time, Hofmann further developed his technical knowledge of mathematics, even inventing and patenting an electromagnetic comptometer" ("Hans Hofmann", 2007). Despite this, Hofmann's interest in art was superior to his interest in mathematics and, when his father died in the late 1800s, Hofmann decided to pursue this interest in greater detail. By 1898, Hofmann was studying art at the Mortiz Heymann's art school in Munich, where he came into contact with

Analysis between eBay and Amazon.com Research Proposal

Analysis between eBay and Amazon.com - Research Proposal Example at these goods not only include books, clothes, electronics, machinery, tickets or vehicles but also the daily groceries almost completely erasing the need to go to a superstore (Borade, 2008). The massive development of the ecommerce sector owes full credit to the two giants, eBay Inc. and Amazon.com; two of the first Internet shopping companies. These websites sell all kinds of products including vehicles, equipment, machinery, clothing, toys, gadgets, computers, and books. They not only sell products directly to customers but also act as intermediates for companies such as IBM or Bed Bath & Beyond, and third parties who sell their products through these websites. Moreover, they are also affiliated with other companies; for instance, eBay is affiliated with PayPal, a global money transfer organization (History of Ecommerce, 2004). Although both eBay and Amazon are online shopping companies, their business models are quite different from each other. This is due to the fact that they were based on entirely different concepts. At the time Amazon was created, it was simply an online bookstore. Precisely speaking, the company used to sell books owned by itself. And with the passage of time, Amazon increased the variety of products sold on the website, which initially included CDs, mp3 players, and other electronic gadgets. On the other hand, eBay was initiated as an online auction company as well as a shopping website for all kinds of goods, ranging from clothes to electronics. EBay did not auction or sell products owned by itself but rather acted as an intermediary for various companies or random sellers to sell their products through the eBay website (Online Auction, 2005). However, due to the current financial crisis both companies have changed their course of action in order to survive in the Internet shopping industry. Amazon has started inviting small-scale sellers to list their products in the website, just like eBay. Meanwhile, eBay has started fixed price