Franklin, James

The primary U.S. producers of ground calcium carbonate are Columbia River Carbonates, ECC International, Franklin Limestone Co., Genstar Stone Products, Georgia Marble Company, J.M. Huber Corp., Calcium Carbonates Division, James River Limestone Co., Inc., OMYA Inc. 

Early diffraction photographs of such DNA fibers taken by Rosalind Franklin and Maurice Wilkins in London and interpreted by James Watson and Francis Crick in Cambridge revealed two types of DNA structures A-DNA and B-DNA. The B-DNA form is obtained when DNA is fully hydrated as it is in vivo. A-DNA is obtained under dehydrated nonphysiological conditions. Improvements in the methods for the chemical synthesis of DNA have recently made it possible to study crystals of short DNA molecules of any selected sequence. These studies have essentially confirmed the refined fiber diffraction models for A- and B-DNA and in addition have given details of small structural variations for different DNA sequences. Furthermore, a new structural form of DNA, called Z-DNA, has been discovered. 

The secondary structure of DNA is shown in Figure B. This "double helix" model was first proposed in 1953 by James Watson and Francis Crick, who used the x-ray crystallographic data of Rosalind Franklin and Maurice Wilkins. Beyond that, they were intrigued by the results of analyses that showed that in DNA the ratio of adenine to thymine molecules is almost exactly 1 1, as is the ratio of cytosine to guanine ... 

The structure of DNA was discovered by (shown left to right) Francis Crick, James Watson, Maurice Wilson, and Rosalind Franklin. 

DiYanni, Robert. One Hundred Great Essays (New York Longman, 2001) great variety, including works by Queen Elizabeth I, Benjamin Franklin, Zora Neale Hurston, James Thurber, and Amy Tan. 

Foustoukos DI, James RH, Seyfried Jr WE (2003) Lithium isotopic systematics of the Main Endeavor Field vent fluids. Northern Juan de Fuca Ridge. Geochim Cosmochim Acta 67 A101 Franklin KJ, Halliday JD, Plante LM, Symons EA (1986) Measurement of the Li-6 Li-7 isotope ratio for lithium-salts hy FT NMR-spectroscopy. J Magnet Resonance 67 162-165 Fritz SJ (1992) Measuring the ratio of aqueous diliusion coefficients between Li Ck and Li Cf by osmometry. Geochim Cosmochim Acta 56 3781-3789... 

Submitted by Lai C. Vishwakarma, Orum D. Stringer, and Franklin A. Davis. Checked by James Pribish and Edwin Vedejs. 

Submitted by Dean L. Fanelli, Joanna M. Szewczyk, Yulian Zhang, G. Venkat Reddy, David M. Burns, and Franklin A. Davis.1 Checked by James Unch and David J. Hart. 

President and Chief Executive Officer G. Franklin Lewis Senior Vice President, Operations James H. Higby... 

Michael C. Weismiller, James C. Towson, and Franklin A. Davis 154 SYNTHESIS OF (-)-D-2,10-CAMPHORSULTAM... 

Francis Crick recognized that Franklin s data implied a helical structure for B-DNA. Using helical parameters deduced from the pattern, knowing the chemical composition of DNA and the structures of DNA s molecular components, and finally, using the tantalizing observation that certain pairs of bases occur in equimolar amounts, James Watson was able to build a feasible model of B-DNA. 

James D. Watson (1928-) and Francis H. C. Crick (1916- ) publish two landmark papers in the journal Nature. The papers are entitled Molecular structure of nucleic acids a structure for deoxyribose nucleic acid and Genetic implications of the structure of deoxyribonucleic acid. Watson and Crick propose a double helical model for DNA and call attention to the genetic implications of their model. Their model is based, in part, on the x-ray crystallographic work of Rosalind Franklin (1920-1958) and the biochemical work of Erwin Chargaff (1905- ). Their model explains how the genetic material is transmitted. 

But what if you know that George Washington was the first president and Abraham Lincoln was the sixteenth president The question gets even trickier because the other two incorrect answer choices are James Buchanan, the thirteenth president, and Millard Fillmore, the fifteenth president. In other words, unless you happen to know that Franklin Pierce was the fourteenth president, it would be very difficult to figure out he is the correct answer based solely on the answer choices. 

Because Franklin and Wilkins were hardly speaking to each other, Franklin left King s College in 1953 for Birkbeck College, also in London, where she finished her DNA work and became head of the team studying tobacco mosaic virus. Franklin died of ovarian cancer on April 16, 1958, at the age of 37. see also Deoxyribonucleic Acid (DNA) Double Helix Pauling, Linus Watson, James Dewey. 

Gloriosa superba (Liliaceae) poison of Medea of Colchis 18th century gout immortalized by artists William Hogarth James Gillray victims included Benjamin Franklin,... 

The existence of specific base-pairing interactions was discovered in the course of studies directed at determining the three-dimensional structure of DNA. Maurice Wilkins and Rosalind Franklin obtained x-ray diffraction photographs of fibers of DNA (Figure 5.10). The characteristics of these diffraction patterns indicated that DNA was formed of two chains that wound in a regular helical structure. From these and other data, James Watson and Francis Crick inferred a structural model for DNA that accounted for the diffraction pattern and was also the source of some remarkable insights into the functional properties of nucleic acids (Figure 511). 

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