16-17 DNA history Notes (2)
... are located on chromosomes, the two components of chromosomes— DNA and protein —became candidates for the genetic material • The key factor in determining the genetic material was choosing appropriate experimental organisms • The role of DNA in heredity was first discovered by studying bacteria and ...
... are located on chromosomes, the two components of chromosomes— DNA and protein —became candidates for the genetic material • The key factor in determining the genetic material was choosing appropriate experimental organisms • The role of DNA in heredity was first discovered by studying bacteria and ...
Recombinant DNA and gene cloning To use an unique feature(s) of
... Recombinant DNA and gene cloning To use an unique feature(s) of your gene/gene product to isolate the DNA fragment containing your gene from a library of DNA fragments. Difficulty in isolating genes (needle in a long line of connected needles): A gene is a small part of a large DNA (0.01% of an aver ...
... Recombinant DNA and gene cloning To use an unique feature(s) of your gene/gene product to isolate the DNA fragment containing your gene from a library of DNA fragments. Difficulty in isolating genes (needle in a long line of connected needles): A gene is a small part of a large DNA (0.01% of an aver ...
DNA Cornell notes
... How did Rosalind Franklin used x-ray diffraction to create pictures of DNA’s molecular Franklin contribute to the structure discovery of the DNA structure? Who discovered the James Watson and Frances Crick determined the structure of DNA in structure of DNA? 1953 using their data and the work of p ...
... How did Rosalind Franklin used x-ray diffraction to create pictures of DNA’s molecular Franklin contribute to the structure discovery of the DNA structure? Who discovered the James Watson and Frances Crick determined the structure of DNA in structure of DNA? 1953 using their data and the work of p ...
Laser Light Scattering
... • The correlation time tc is a measure of the time needed to diffuse a characteristic distance in solution – this distance is defined by the wavelength of light, the scattering angle and the optical properties of the solvent – ranges from 40 to 400 nm in typical systems • Values of tc can range from ...
... • The correlation time tc is a measure of the time needed to diffuse a characteristic distance in solution – this distance is defined by the wavelength of light, the scattering angle and the optical properties of the solvent – ranges from 40 to 400 nm in typical systems • Values of tc can range from ...
Maurice Wilkins
Maurice Hugh Frederick Wilkins CBE FRS (15 December 1916 – 5 October 2004) was a New Zealand-born English physicist and molecular biologist, and Nobel Laureate whose research contributed to the scientific understanding of phosphorescence, isotope separation, optical microscopy and X-ray diffraction, and to the development of radar. He is best known for his work at King's College, London on the structure of DNA which falls into three distinct phases. The first was in 1948–50 where his initial studies produced the first clear X-ray images of DNA which he presented at a conference in Naples in 1951 attended by James Watson. During the second phase of work (1951–52) he produced clear ""B form"" ""X"" shaped images from squid sperm which he sent to James Watson and Francis Crick causing Watson to write ""Wilkins... has obtained extremely excellent X-ray diffraction photographs""[of DNA]. Throughout this period Wilkins was consistent in his belief that DNA was helical even when Rosalind Franklin expressed strong views to the contrary.In 1953 Franklin instructed Raymond Gosling to give Wilkins, without condition, a high quality image of ""B"" form DNA which she had unexpectedly produced months earlier but had “put it aside” to concentrate on other work. Wilkins, having checked that he was free to personally use the photograph to confirm his earlier results, showed it to Watson without the consent of Rosalind Franklin. This image, along with the knowledge that Linus Pauling had published an incorrect structure of DNA, “mobilised” Watson to restart model building efforts with Crick. Important contributions and data from Wilkins, Franklin (obtained via Max Perutz) and colleagues in Cambridge enabled Watson and Crick to propose a double-helix model for DNA. The third and longest phase of Wilkins' work on DNA took place from 1953 onwards. Here Wilkins led a major project at King's College, London, to test, verify and make significant corrections to the DNA model proposed by Watson and Crick and to study the structure of RNA. Wilkins, Crick and Watson were awarded the 1962 Nobel Prize for Physiology or Medicine, ""for their discoveries concerning the molecular structure of nucleic acids and its significance for information transfer in living material.""