Αποτελέσματα Αναζήτησης
1 Φεβ 2018 · Rosalind Franklin used X-ray diffraction to determine the structure of DNA molecules. One of her best X-ray pictures is numbered Photo 51 and is shown in Fig. 1 (a). This photo was instrumental to J. D. Watson and F. Crick in deducing the double-helix model of DNA.
This diffraction photo of hydrated sodium thymonucleate (DNA) provided crucial evidence supporting the double helix DNA structure proposed by James Watson and Francis Crick (Cavendish Laboratory, Cambridge University) based on published chemical clues and a physical molecular model they constructed.
1 Οκτ 2019 · While replicating the X-ray diffraction on DNA molecules is out of the reach of many laboratories, the use of this simplified model (spring + laser) allows us to explore the diffraction technique and to obtain the dimensional parameters of the helix with a rather good approximation.
X-ray diffraction and X-ray scattering. Involves the elastic scattering of X -rays. Diffraction is primarily used for structure determination. How are atoms or molecules arranged? What is the crystal structure? Scattering uses differences in electron density and looks at larger structures. X-rays are part of the electromagnetic spectrum
1 Μαΐ 2007 · A step-by-step method of teaching the X-ray diffraction analysis of DNA using the approach employed by James Watson, Francis Crick, Maurice Wilkins, Rosalind Franklin, and Raymond Gosling at an upper undergraduate and graduate level is described.
25 Ιαν 2017 · Biological crystallography, the main method of structural biology, which is the branch of biology that studies the structure and spatial organization in biological macromolecules, is based on the study of X-ray diffraction by crystals of macromolecules.
X-ray diffraction is a popular technique to discover the structures of organic molecules such as proteins (Session 31) and, most famously, DNA (Session 32), as well as inorganic crystals.
