Download or read book Atlas of Steroid Structure written by William L. Duax and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 753 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Atlas of Steroid Structure written by William L. Duax and published by Springer. This book was released on 1975-10 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: The crystal structure determinations of over 235 natural and synthetic steroid molecules reported from 1945 to 1974 constitute the most detailed block of structural data on any class of biologically active molecules in existence and provide a wealth of raw material concerning molecular con formation and intermolecular interactions ideally suited to the analysis of structure-function correlations. Volumes of physiological data gener ated in studies ranging from simple dose-response characterizations to elegant examination of receptor binding sites make up the functional counterpart to this structural data reservoir. The utilization of these data for purposes of exploring biochemical reactions at the molecular level has been inhibited by lack of communication among structural chemists, bio chemists, and clinicians. The typical non-crystallographer in the fields of biochemistry and endocrinology finds it difficult to interpret structure reports. The molecular features of key importance from his point of view are often omitted, and, although atomic coordinates are usually tabulated, he may be unable to calculate the details which he needs. Structure reports on steroids have often been published in obscure journals and in some cases the paper has been extremely brief and no mention of the biological importance of the material has been made. Lack of uniformity in presen tation of data has also been an impediment to utilization of these data by non-crystallographers. Similarly, the average crystallographer has difficulty assessing data concerning biological activity.
Download or read book Atlas of Steroid Structure written by William L. Duax and published by . This book was released on 1975 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atlas of Steroid Structure written by William L. Duax and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atlas of Steroid Structure written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atlas of the Three dimensional Structure of Drugs written by J. P. Tollenaere and published by North-Holland. This book was released on 1979 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atlas of Steroid Spectra written by Walter Neudert and published by . This book was released on 1965 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Structure and Biological Activity of Steroids written by Martin Bohl and published by CRC Press. This book was released on 2018-01-18 with total page 669 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular Structure and Biological Activity of Steroids focuses on the indentification of steroid structural features that control particular biological effects. Steroid geometry plays a critical role in steroid activity; therefore, the results of X-ray crystallographic, NMR spectroscopic, and theoretical studies on structure-activity relationships form an integral part of the book. Well-established observations and proposed models are presented, summarizing knowledge of molecular features (e.g., steroid backbone structures, side-chain constitutions, substitution sites, configurations, hydrogen-bonding patterns) that can affect steroid action. The book also provides overviews about recent progress in various frontier fields of steroid research, including such areas as sex steroids, glucocorticoids, aromatase inhibitors, vitamin D metabolites, brassinosteroids, neuromuscular blocking agents, and cardiotonic steroids. Molecular Structure and Biological Activity of Steroids is a "must-have" resource for biochemists, pharmacologists, endocrinologists, biophysicists, and others actively involved in steroid research.
Download or read book Structure Based Drug Design written by P.W. Codding and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structure-Based Drug Design brings together scientists working on different aspects of the subject, demonstrating the necessary collaboration and interdisciplinary approach to this complex area. The focus is on X-ray crystallographic and computational approaches. The general aspects of these approaches are introduced in the first six articles. The remaining articles provide examples of the application of X-ray crystallography, molecular modelling, molecular dynamics, QSAR, database analysis, and homology modelling. The papers cover a wealth of interesting problems in the design of new and enhanced pharmaceuticals.
Download or read book Terpenoids and Steroids written by James R Hanson and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular areas of chemistry. For over 90 years The Royal Society of Chemistry and its predecessor, the Chemical Society, have been publishing reports charting developments in chemistry, which originally took the form of Annual Reports. However, by 1967 the whole spectrum of chemistry could no longer be contained within one volume and the series Specialist Periodical Reports was born. The Annual Reports themselves still existed but were divided into two, and subsequently three, volumes covering Inorganic, Organic and Physical Chemistry. For more general coverage of the highlights in chemistry they remain a 'must'. Since that time the SPR series has altered according to the fluctuating degree of activity in various fields of chemistry. Some titles have remained unchanged, while others have altered their emphasis along with their titles; some have been combined under a new name whereas others have had to be discontinued. The current list of Specialist Periodical Reports can be seen on the inside flap of this volume.
Download or read book Terpenoids and Steroids written by K H Overton and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular areas of chemistry. For over 90 years The Royal Society of Chemistry and its predecessor, the Chemical Society, have been publishing reports charting developments in chemistry, which originally took the form of Annual Reports. However, by 1967 the whole spectrum of chemistry could no longer be contained within one volume and the series Specialist Periodical Reports was born. The Annual Reports themselves still existed but were divided into two, and subsequently three, volumes covering Inorganic, Organic and Physical Chemistry. For more general coverage of the highlights in chemistry they remain a 'must'. Since that time the SPR series has altered according to the fluctuating degree of activity in various fields of chemistry. Some titles have remained unchanged, while others have altered their emphasis along with their titles; some have been combined under a new name whereas others have had to be discontinued. The current list of Specialist Periodical Reports can be seen on the inside flap of this volume.
Download or read book Steroid Analysis written by Hugh L. J. Makin and published by Springer Science & Business Media. This book was released on 2010-06-04 with total page 1240 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of this handbook concentrates on the analysis of steroids in biological fluids. It offers analysis of low levels of steroid analytes in biological fluids. This new edition also provides an extra chapter on pharmaceutical aspects of steroid analysis. Coverage details spectroscopic and other methods, including UV and IR absorption spectroscopy, NMR spectroscopy, mass spectrometry, X-ray diffraction, chromatography and immunoassay of steroids.
Download or read book National Library of Medicine Current Catalog written by National Library of Medicine (U.S.) and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: First multi-year cumulation covers six years: 1965-70.
Download or read book Structure Correlation written by Hans-Beat Bürgi and published by John Wiley & Sons. This book was released on 2008-07-11 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book leaves the conventional view of chemical structures far behind: it demonstrates how a wealth of valuable, but hitherto unused information can be extracted from available structural data. For example, a single structure determination does not reveal much about a reaction pathway, but a sufficiently large number of comparable structures does. Finding the 'right' question is as important as is the intelligent use of crystallographic databases. Contributions by F.H. Allen, T.L. Blundell, I.D. Brown, H.B. Bürgi, J.D. Dunitz, L. Leiserowitz and others, authoritatively discuss the structure correlation method as well as illustrative results in detail, covering such apparently unrelated subjects as * Bond strength relations in soldis * Crystal structure prediction * Reaction pathways of organic molecules * Ligand/receptor interactions and enzyme mechanisms This book will be useful to the academic and industrial reader alike. It offers both fundamental aspects and diverse applications of what will surely become a powerful branch of structural chemistry.
Download or read book Hormones and the Fetus written by J. R. Pasqualini and published by Elsevier. This book was released on 2013-10-22 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume One of Hormones and the Fetus contained a generalization of the role of hormones during fetal life. In this second volume, the main topics focus on hormonal binding to fetal and maternal plasma proteins, amniotic fluid and placenta; the presence of hormone receptors in the fetal compartment; and the mechanism of action of various hormones in different target tissues of the fetus and placenta. This up-to-date information is of major importance in the study of hormonal activity in fetal life, and the biological effect of hormones through the receptor. The mechanism of fetal sexual differentiation, in which hormones play an important role, is extensively covered.
Download or read book Terpenoids and Steroids written by Chemical Society (Great Britain) and published by Royal Society of Chemistry. This book was released on 1974 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular areas of chemistry. For over 90 years The Royal Society of Chemistry and its predecessor, the Chemical Society, have been publishing reports charting developments in chemistry, which originally took the form of Annual Reports. However, by 1967 the whole spectrum of chemistry could no longer be contained within one volume and the series Specialist Periodical Reports was born. The Annual Reports themselves still existed but were divided into two, and subsequently three, volumes covering Inorganic, Organic and Physical Chemistry. For more general coverage of the highlights in chemistry they remain a 'must'. Since that time the SPR series has altered according to the fluctuating degree of activity in various fields of chemistry. Some titles have remained unchanged, while others have altered their emphasis along with their titles; some have been combined under a new name whereas others have had to be discontinued. The current list of Specialist Periodical Reports can be seen on the inside flap of this volume.
Download or read book Topics in Stereochemistry written by Norman L. Allinger and published by John Wiley & Sons. This book was released on 2009-09-17 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This seminal series, first edited by Ernest Eliel, responsible for some of the major advances in stereochemistry and the winner of the ACS Priestley Medal in 1996, provides coverage of the major developments of the field of stereochemistry. The scope of this series is broadly defined to encompass all fields of chemical and biological sciences that are founded on molecular and supramolecular interactions. Insofar as chemical, physical, and biological properties are determined by molecular shape and structure, the importance of stereochemistry is fundamental to and consequential for all natural sciences. Topics in Stereochemistry serves as a multidisciplinary series that enriches all of chemistry. Aimed at advanced students, university professors and teachers as well as researchers in pharmaceutical, agricultural, biotechnological, polymer, materials, and fine chemical industries, Topics in Stereochemistry publishes definitive and scholarly reviews in stereochemistry and has long been recognized as the gold standard reference work in this field. Covering the effect of chirality on all aspects of molecular interaction from the fundamental physical chemical properties of molecules and their molecular physics to the application of chirality in new areas such as its applications in materials science, Topics in Stereochemistry explores a wide variety of properties, both physical and chemical of isomers with a view to their applications in a number of disciplines from biochemistry to materials science.
