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Biochemistry & molecular biology Biochemistry & molecular biology1952 With the discovery of gas chromatography, a new analytical method was available that is widely used in organic elemental analysis - can you help me do my homework , in environmental and drug analysis. The invention of zone melting made it possible to bring metals and semi-metals to a purity of 99.9999999%. It was only through this process that silicon could be produced with a purity suitable for the construction of microchips. LINUS PAULING (1901-1994) and ROBERT B. COREY (1897-1971) discovered the α-helix and β-sheet structure as typical structural elements - online chemistry problem solver - of proteins during their investigations of chemical bonds by means of X-ray structure analysis. The English chemist ALEXANDER ROBERT TODD (1907-1997) recognized the construction principle of nucleotides and the way they are linked to form nucleic acids. The US detonated the first hydrogen bomb on Eniwetok Atoll in the Pacific . It was about 700 times as powerful as the Hiroshima atomic bomb. The 1 km wide and 5 km long atoll was completely destroyed by the 65 t heavy bomb.1953 Through simulation experiments, STANLEY LLOYD MILLER (1930-2007) and SIDNEY W. FOX confirmed that the primordial atmosphere of the earth consisted of ammonia, methane, hydrogen and water. They demonstrated that thunderstorms and high temperatures could produce amino acids and proteins from them and coined the term chemical evolution.The American JAMES DEWEY WATSON (* 1928) and the Briton FRANCIS HARRY COMPTON CRICK (1916-2004) discovered the molecular double helix structure of DNA.This proposed structure was confirmed by the New Zealander MAURICE HUGH FREDERICK WILKINS (1916-2004) by X-ray structure analysis - online college homework help . The immediate prerequisite and basis for this discovery was provided by the first X-ray diffraction studies of the DNA that the English biochemist ROSALIND FRANKLIN (1920-1958) had previously carried out.Based on their observations, WATSON and CRICK suspected that the genetic information is contained in the DNA as a sequence of bases whose pairing occurs in a complementary manner during replication. Then the genetic information is used to determine the amino acid sequence of the proteins, using a sequence of three bases per amino acid (triplet code). CRICK also designed a model for protein biosynthesis that contained an "adapter" between DNA and amino acids (adapter hypothesis) and described the direction of the flow of information from DNA to protein. It is still considered to be the central dogma of genetics today .See also:Physics: EnergyBiochemistry, molecular biologyPolitics as a subjectAn example of design patternsFamous math theorems
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