Atlas of Steroid Structure

Language: English

Published by Springer, Springer Jun 2012, 2012

1475704283 / 9781475704280

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This item is printed on demand - Print on Demand Titel. Neuware -model. In general, the mean atomic positions and the geometrical parameters calculated from them are more accurate if the more sophisticated anisotropic model has been used for the thermal motion during structure refinement. Low temperature data collection also results in more accurately determined structures. By decreasing the temperature at which data is collected, the intensities and number of data observed is increased. Since hydrogen atoms have only a single electron, they scatter X-rays very weakly, and they can be observed experimentally only if the data are of good quality. Finally, in the absence of systematic errors in data collection or refinement, tae greater the number of observed data relative to the number of independent atoms, the better the atomic resolution will be. Table 1 is a summary of the information used in assessing the reliability of a structure. Neutron diffraction is the result of interaction of atomic nuclei with a neutron beam. The intensi ty of the diffracted beam is not proportional to atomic number. Hydrogen, deuterium, carbon, oxygen and nitrogen scatter neutrons with almost equal intensity. In addition, hydrogen and deuterium scatter out of phase so that they can be distinguished wita high precision. 20-Methyl-5-pregnene-3S,20-diol (PR104N) is the only steroid which has been the subject of a neutron diffraction study. The study was undertaken to examine the stereospecificity of Grignard addition using deuterated reagent. Data were collected at 123°K.Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 764 pp. Englisch.…

Seller Inventory # 9781475704280

Title
Atlas of Steroid Structure
Author
William L. Duax
Publisher
Springer, Springer Jun 2012
Publication year
2012
Condition
Neu
Binding
Taschenbuch
Language
English
ISBN 10
1475704283
ISBN 13
9781475704280
Item weight
1,826 grams
Dimensions
279x210x41 mm

buchversandmimpf2000

Emtmannsberg, BAYE, Germany

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