Author: William L. Duax
Publisher: Springer Science & Business Media
ISBN: 1475704267
Category : Science
Languages : en
Pages : 753
Book Description
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.
Atlas of Steroid Structure
Author: William L. Duax
Publisher: Springer Science & Business Media
ISBN: 1475704267
Category : Science
Languages : en
Pages : 753
Book Description
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.
Publisher: Springer Science & Business Media
ISBN: 1475704267
Category : Science
Languages : en
Pages : 753
Book Description
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.
Official Gazette of the United States Patent and Trademark Office
Author:
Publisher:
ISBN:
Category : Patents
Languages : en
Pages : 1178
Book Description
Publisher:
ISBN:
Category : Patents
Languages : en
Pages : 1178
Book Description
Advances in Computer Science - ASIAN 2004, Higher Level Decision Making
Author: Michael J. Maher
Publisher: Springer
ISBN: 3540305025
Category : Computers
Languages : en
Pages : 522
Book Description
Publisher: Springer
ISBN: 3540305025
Category : Computers
Languages : en
Pages : 522
Book Description
Medical Subject Headings
Author: National Library of Medicine (U.S.)
Publisher:
ISBN:
Category : Index medicus (National Library of Medicine (U.S.))
Languages : en
Pages : 386
Book Description
Publisher:
ISBN:
Category : Index medicus (National Library of Medicine (U.S.))
Languages : en
Pages : 386
Book Description
Catalog of Information on Water Data
Author:
Publisher:
ISBN:
Category : Stream measurements
Languages : en
Pages : 698
Book Description
Publisher:
ISBN:
Category : Stream measurements
Languages : en
Pages : 698
Book Description
Molecular Structures and Dimensions
Author: Olga Kennard
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 666
Book Description
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 666
Book Description
HIV Immunology and HIV SIV Vaccine Databases 2003
Author:
Publisher: DIANE Publishing
ISBN: 1428918124
Category :
Languages : en
Pages : 1346
Book Description
Publisher: DIANE Publishing
ISBN: 1428918124
Category :
Languages : en
Pages : 1346
Book Description
Cumulated Index Medicus
Author:
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 1060
Book Description
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 1060
Book Description
Medical Subject Headings
Author: National Library of Medicine (U.S.). Medical Subject Headings Section
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 474
Book Description
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 474
Book Description
Fundamental Concepts of Abstract Algebra
Author: Gertrude Ehrlich
Publisher: Courier Corporation
ISBN: 0486291863
Category : Mathematics
Languages : en
Pages : 354
Book Description
This undergraduate text presents extensive coverage of set theory, groups, rings, modules, vector spaces, and fields. It offers numerous examples, definitions, theorems, proofs, and practice exercises. 1991 edition.
Publisher: Courier Corporation
ISBN: 0486291863
Category : Mathematics
Languages : en
Pages : 354
Book Description
This undergraduate text presents extensive coverage of set theory, groups, rings, modules, vector spaces, and fields. It offers numerous examples, definitions, theorems, proofs, and practice exercises. 1991 edition.