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Home > Category Index for Science Quotations > Category Index M > Category: Molecular Structure

Molecular Structure Quotes (8 quotes)

Conclusion: Big helix in several chains, phosphates on outside, phosphate-phosphate inter-helical bonds disrupted by water. Phosphate links available to proteins.
Underlined in typewritten lecture notes, with handwritten annotations, as report (7 Feb 1952) on 'Colloquium November 1951'. As given in Anne Sayre, Rosalind Franklin and DNA (1975), 128.
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One of the most striking evidences of the reliability of the organic chemist's methods of determining molecular structure is the fact that he has never been able to derive satisfactory structures for supposed molecules which are in fact nonexistent.
Physical Organic Chemistry; Reaction Rates, Equilibria, and Mechanisms (1940),38.
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One reason which has led the organic chemist to avert his mind from the problems of Biochemistry is the obsession that the really significant happenings in the animal body are concerned in the main with substances of such high molecular weight and consequent vagueness of molecular structure as to make their reactions impossible of study by his available and accurate methods. There remains, I find, pretty widely spread, the feeling—due to earlier biological teaching—that, apart from substances which are obviously excreta, all the simpler products which can be found in cells or tissues are as a class mere objects, already too remote from the fundamental biochemical events to have much significance. So far from this being the case, recent progress points in the clearest way to the fact that the molecules with which a most important and significant part of the chemical dynamics of living tissues is concerned are of a comparatively simple character.
In 'The Dynamic Side of Biochemistry', Address (11 Sep 1913) in Report on the 83rd Meeting of the British Association for the Advancement of Science (1914), 657-8.
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The ingenuity and effective logic that enabled chemists to determine complex molecular structures from the number of isomers, the reactivity of the molecule and of its fragments, the freezing point, the empirical formula, the molecular weight, etc., is one of the outstanding triumphs of the human mind.
'Trends in Chemistry', Chemical Engineering News, 7 Jan 1963, 5.
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The nucleic acids, as constituents of living organisms, are comparable In importance to proteins. There is evidence that they are Involved In the processes of cell division and growth, that they participate In the transmission of hereditary characters, and that they are important constituents of viruses. An understanding of the molecular structure of the nucleic acids should be of value In the effort to understand the fundamental phenomena of life.
[Co-author with American chemist, B. Corey (1897-1971)]
'A Proposed Structure for the Nucleic Acids', Proceedings of the National Academy of Sciences (1953), 39, 84.
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The results suggest a helical structure (which must be very closely packed) containing probably 2, 3 or 4 coaxial nucleic acid chains per helical unit and having the phosphate groups near the outside.
Official Report, submitted in Feb 1952. In Anne Sayre, Rosalind Franklin and DNA (2000), 126.
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We wish to discuss a structure for the salt of deoxyribose nucleic acid. (D.N.A.). This structure has novel features which are of considerable biological interest. [Co-author with Francis Crick]
From James Watson and Francis Crick, 'Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid', Nature (25 Apr 1953), 171, No. 4356, 737. (Note: in W.F. Bynum and Roy Porter (eds.), Oxford Dictionary of Scientific Quotations (2005), 226, this quote is listed under Rosalind Elsie Franklin and cited, incorrectly, as from “Rosalind Franklin and R. G. Gosling, 'Molecular Structures of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid', Nature, 1953, 171, 737.” However, the actual Franklin and Gosling article in that issue, is on pp.740-741, and titled 'Molecular Configuration in Sodium Thymonucleate'.)
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While the biological properties of deoxypentose nucleic acid suggest a molecular structure containing great complexity, X-ray diffraction studies described here … show the basic molecular configuration has great simplicity. [Co-author with A.R. Stokes, H.R. Wilson. Thanks include to “… our colleagues R.E. Franklin, R.G. Gosling … for discussion.”]
From 'Molecular Structure of Deoxypentose Nucleic Acids', Nature (25 Apr 1953), 171, No. 4356, 738. (Note: in W.F. Bynum and Roy Porter (eds.), Oxford Dictionary of Scientific Quotations (2005), 226, this quote is listed under Rosalind Elsie Franklin and cited, incorrectly, as from “Rosalind Franklin and R. G. Gosling, 'Molecular Structures of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid', Nature, 1953, 171, 741.” However, the Franklin and Gosling article on p.741 is the second of two pages titled 'Molecular Configuration in Sodium Thymonucleate'.)
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Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
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