Saturday, March 21, 2020

Style Of J. D. Salinger Essays - J. D. Salinger, Free Essays

Style Of J. D. Salinger Essays - J. D. Salinger, Free Essays Style of J. D. Salinger Many critics consider J.D. Salinger a very controversial writer, for the subject matters that he writes.. J.D. Salinger?s works were generally written during two time periods. The first time period was during World War II, and the second time period was during the 1960?s. Critics feel that the works during the 1960 time period were very inappropriate, because of the problems for which he wrote. The main characters were generally misfits of society. In most of his works, he has the protagonist of the story go on a quest for happiness. Salinger does not conform to the material happiness; the characters undergo a spiritual happiness. The characters generally start out as in bad conditions, through the end of his works they undergone changes that change them for the better. The works of J.D. Salinger show the quest for happiness through religion, loneliness, and symbolism. Salinger?s works often use religion in order to portray comfort. In Salinger?s Nine Stories Franny Glass keeps reciting the "Jesus Prayer" to cope with the suicide of her brother Seymour (Bloom in Bryfonski and Senick 69). Salinger is able to use this prayer as a means of comfort for Franny. The prayer ezds for the last hope for Franny in this situation. Franny would be lost if their was no prayer. (Bryfonski and Senick 71). Salinger shows us comfort in Catcher in the Rye. Holden Caufield, the protagonist, is very much in despair for losing his girlfriend, so Caufield reads a passage in the Bible. This helps Holden change his outlook on life (Salzberg 75). Holden was all alone at this point and had no one to turn back on, until he found the Bible (Salzberg 76). In both stories the characters had found themselves in bad situations. The characters in these works have obstacles which they must overcome in order to achieve happiness (Salzman 34). Happiness is the very subezce which all of these characters are striving for in Salinger?s works. Salinger uses religion in his works to comfort them so that they can proceed on their quest to achieve happiness. Salinger uses religion as a means for liberation. Salinger uses much of the Zen philosophy, as in the case of Nine Stories, to achieve this liberation (Madsen 93). In Nine Stories one of the characters, Seymour Glass, is portrayed as Buddha in the sense that he wants to be liberated as Buddha was in his life (Madsen 93). Seymour Glass in Nine Stories has a certain philosophy about life, it is similar to the Eightfold Path used by Buddha when achieving nirvana (French in Matuz 212). Seymour Glass is on a quest to become free from all of the suffering in his life as Buddha was from his life (French in Matuz 213). Seymour follows the Eightfold path to become liberated from suffering (Madsen 96). Seymour achieves "nirvana" by living a good life and end anything that causes suffering. Seymour is able to attain nirvana by committing suicide (Lundquist in Matuz 211). Salinger shows us that when Seymour committed suicide he let go of all of the suffering that he encountered, thus attaining the happiness he longed for (French, Salinger Revisited 132). Salinger shows liberation as an end to all suffering, thus creating happiness for the character. (French, Salinger Revisited 133). The final function of religion as a means to attain happiness was to gain peace In "The Young Lion," Salinger uses religion to gain peace through a fictitious war. In the story many of the soldiers were dying and the countries were in turmoil (Lundquist 312). The leaders in the story see a vision on the battlefield that changes them, and stops the war (Lundquist 315). Salinger shows how religion can be a force used to create happiness in a story, by creating peace (Lundquist 313). Salinger is able to use religion as a means of attaining happiness through peace. The story seemed very dismal, until religion intervened and stopped the conflict. Salinger creates happiness for the characters by stopping the conflict. In "The Stranger" Salinger creates peace through a war by using more of the Zen philosophy. Salinger?s creates a "Pact of Peace" which stops the conflict between

Wednesday, March 4, 2020

Protein and Polypeptide Structure

Protein and Polypeptide Structure There are four levels of structure found in polypeptides and proteins. The primary structure of a polypeptide protein determines its secondary, tertiary, and quaternary structures. Primary Structure The primary structure of polypeptides and proteins is the sequence of amino acids in the polypeptide chain with reference to the locations of any disulfide bonds. The primary structure may be thought of as a complete description of all of the covalent bonding in a polypeptide chain or protein. The most common way to denote a primary structure is to write the amino acid sequence using the standard three-letter abbreviations for the amino acids. For example  gly-gly-ser-ala  is the primary structure for a polypeptide composed of glycine, glycine, serine, and alanine, in that order, from the N-terminal amino acid (glycine) to the C-terminal amino acid (alanine). Secondary Structure Secondary structure is the ordered arrangement or conformation of amino acids in localized regions of a polypeptide or protein molecule. Hydrogen bonding plays an important role in stabilizing these folding patterns. The two main secondary structures are the alpha helix and the anti-parallel beta-pleated sheet. There are other periodic conformations  but the ÃŽ ±-helix and ÃŽ ²-pleated sheet are the most stable. A single polypeptide or protein may contain multiple secondary structures. An ÃŽ ±-helix is a right-handed or clockwise spiral in which each peptide bond is in the trans conformation and is planar. The amine group of each peptide bond runs generally upward and parallel to the axis of the helix; the carbonyl group points generally downward. The ÃŽ ²-pleated sheet consists of extended polypeptide chains with neighboring chains extending anti-parallel to each other. As with the ÃŽ ±-helix, each peptide bond is trans and planar. The amine and carbonyl groups of peptide bonds point toward each other and in the same plane, so hydrogen bonding can occur between adjacent polypeptide chains. The helix is stabilized by hydrogen bonding between amine and carbonyl groups of the same polypeptide chain. The pleated sheet is stabilized by hydrogen bonds between the amine groups of one chain and the carbonyl groups of an adjacent chain. Tertiary Structure The tertiary structure of a polypeptide or protein is the three-dimensional arrangement of the atoms within a single polypeptide chain. For a polypeptide consisting of a single conformational folding pattern (e.g., an alpha helix only), the secondary and tertiary structure may be one and the same. Also, for a protein composed of a single polypeptide molecule, tertiary structure is the highest level of structure that is attained. Tertiary structure is largely maintained by disulfide bonds. Disulfide bonds are formed between the side chains of cysteine by oxidation of two thiol groups (SH) to form a disulfide bond (S-S), also sometimes called a disulfide bridge. Quaternary Structure Quaternary structure is used to describe proteins composed of multiple subunits (multiple polypeptide molecules, each called a monomer). Most proteins with a molecular weight greater than 50,000 consists of two or more noncovalently-linked monomers. The arrangement of the monomers in the three-dimensional protein is the quaternary structure. The most common example used to illustrate quaternary structure is the hemoglobin protein. Hemoglobins quaternary structure is the package of its monomeric subunits. Hemoglobin is composed of four monomers. There are two ÃŽ ±-chains, each with 141 amino acids, and two ÃŽ ²-chains, each with 146 amino acids. Because there are two different subunits, hemoglobin exhibits heteroquaternary structure. If all of the monomers in a protein are identical, there is homoquaternary structure. Hydrophobic interaction is the main stabilizing force for subunits in quaternary structure. When a single monomer folds into a three-dimensional shape to expose its polar side chains to an aqueous environment and to shield its nonpolar side chains, there are still some hydrophobic sections on the exposed surface. Two or more monomers will assemble so that their exposed hydrophobic sections are in contact. More Information Do you want more information on amino acids and proteins? Here are some additional online resources on  amino acids  and  chirality of amino acids. In addition to general chemistry texts, information about protein structure can be found in texts for biochemistry, organic chemistry, general biology, genetics, and molecular biology. The biology texts usually include information about the processes of transcription and translation, through which the genetic code of an organism is used to produce proteins.