Selectivity

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Selectivity In Chemical Reactions

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Author : J.C. Whitehead
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Selectivity In Chemical Reactions written by J.C. Whitehead and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.

The aim of this Workshop on "Selectivity in Chemical Reactions" was to examine the specific preferences exhibited by simple chemical reactions with regards to reagents having particular energy states, symmetries, alignment and orientation and the resulting formation of certain products with their corresponding energies, states, alignment and polarisation. Such problems come close to the ultimate goal of reaction dynamics of being able to determine experimentally and theoretically state-to-state cross sections and stereochemical effects under well defined and characterised conditions. There are many examples of highly selective and specific processes to be found in atmospheric and combustion chemistry and the production of population inversions amongst vibrational and electronic states lies at the heart of the development of chemical laser systems. Only when we can understand the fundamental processes that underlie the selectivity in the formation of products in a chemical reaction and the specific requirements of initial states of the reagents, can we expect to be able to develop the explanatory and predictive tools necessary to apply the subject to the development of new laser systems, efficient combustion schemes and specific methods of chemical synthesis, to the control of atmospheric pollution and to all problems in which it is necessary to direct the outcome of a chemical reaction in a specific way. The brief given to the Workshop was to critically review the field, to discuss the present limitations and difficulties and to identify new directions.

Selectivity In Organic Synthesis

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Author : Robert S. Ward
language : en
Publisher: John Wiley & Sons
Release Date : 1999-05-04

Selectivity In Organic Synthesis written by Robert S. Ward and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-05-04 with Science categories.

Selectivity is an increasingly important part of organic synthesis. The whole basis of organic chemistry, and especially organic synthesis, depends upon the selectivity which can be achieved in organic reactions. This concise textbook describes the strategies which can be adopted to improve selectivity, and the reactions which have been specially designed to afford high selectivity. The aim is to illustrate the range of processes to which these principles can be applied and the high degree of selectivity which can be achieved. Selectivity in Organic Synthesis aims to provide a solid introduction to this subject, focusing on the key areas and applications.

The Selectivity Of Drugs

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Author : Adrien Albert
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

The Selectivity Of Drugs written by Adrien Albert and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.

1. 1 What is Selectivity? purpose, and crop protective agent for the A biologically-active substance is said to be second, but there is no fundamental difference selective if it strongly affects certain cells with of principle in their mode of action. out causing any change in others, even when the Drug therapy has two, fundamentally two kinds of cells are close neighbours. In living opposed divisions. The first of these strives to organisms, there are many substances, often improve the action of one of the cell's natural quite small molecules, which have been chosen agents by modifying the molecule in order to for their specificity. This choice has been made localize or intensify its action. For instance, under the strong pressure of natural selection, the solubility can be decreased to make it form unhurried by any consideration of time. Such a deposit, or a change is made so that it becomes chemical compounds operate the metabolism a poorer fit on the naturally-occurring destruc of the cells and tissues, and ensure their health, tive enzyme. Both of these devices have proved survival, and reproduction. Important among useful in therapy, e. g. with steroid hormones. the smaller of these selective molecules are Such drugs, which seek to improve on Nature vitamins, coenzymes, hormones, neurotrans by performing more desirably, are called mitters, inorganic ions, nutritional fragments, agonists.

Selectivity And Discord

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Author : Allan Franklin
language : en
Publisher: University of Pittsburgh Press
Release Date : 2002-11-17

Selectivity And Discord written by Allan Franklin and has been published by University of Pittsburgh Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-11-17 with Philosophy categories.

Selectivity and Discord addresses the fundamental question of whether there are grounds for belief in experimental results. Specifically, Allan Franklin is concerned with two problems in the use of experimental results in science: selectivity of data or analysis procedures and the resolution of discordant results.By means of detailed case studies of episodes from the history of modern physics, Franklin shows how these problems can be—and are—solved in the normal practice of science and, therefore, that experimental results may be legitimately used as a basis for scientific knowledge.

Drug Selectivity

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Author : Norbert Handler
language : en
Publisher: John Wiley & Sons
Release Date : 2018-02-27

Drug Selectivity written by Norbert Handler and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-02-27 with Medical categories.

The book "Drug Selectivity - An Evolving Concept in Medicinal Chemistry" provides a current overview and comprehensive compilation for medicinal chemists that discusses the effects of aiming for multiple targets on the entire drug development process. The result is a broad survey of current and future strategies for drug selectivity in medicinal chemistry with theoretical but also practical aspects. Different strategies are presented and evaluated, such as various design approaches, merged multiple ligands, discovery technologies and a broad range of successful examples of unselective drugs taken from all major disease areas. With its wide-ranging view of an emerging new paradigm in drug development, this handbook is of prime importance for every medicinal and pharmaceutical chemist.

Selectivity In Catalysis

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Author : Mark E. Davis
language : en
Publisher:
Release Date : 1993

Selectivity In Catalysis written by Mark E. Davis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with SCIENCE categories.

Discusses recent research and provides tutorial chapters on enhancing selectivity in catalysis through stereoselectivity, reaction pathway control, shape selectivity, and alloys and clusters. Presents an interdisciplinary approach to increasing selectivity in homogeneous and heterogeneous catalysis research. Includes an overview chapter that discusses the current state of the field and offers a perspective on future directions.

Organolithiums

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Author : Jonathan Clayden
language : en
Publisher: Elsevier
Release Date : 2002-07-12

Organolithiums written by Jonathan Clayden and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-07-12 with Science categories.

Organolithiums: Selectivity for Synthesis.

Selectivity And Detectability Optimizations In Hplc

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Author : Satinder Ahuja
language : en
Publisher: John Wiley & Sons
Release Date : 1989-06-06

Selectivity And Detectability Optimizations In Hplc written by Satinder Ahuja and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989-06-06 with Science categories.

High Performance Liquid Chromatography Edited by Phyllis Brown and Richard Hartwick This contributed volume is designed to consolidate the basic theories of chromatography along with the more exciting developments in the field. This monograph addresses some questions that concern researchers in separation science, including: what is the current state of the art in liquid chromatography; has the development of liquid chromatography plateaued; if so, what new methods will take its place or complement it; and if not, where will the new frontiers be and what direction will liquid chromatography take? 1989 (0 471-84506-X) 688 pp. Quantitative Structure-Chromatographic Retention Relationships R. Kaliszan Written by a pioneer in the field, this book extends and updates research on quantitative structure retention relationships by consolidating and critically reviewing the extensive literature on the subject, while also providing the basic theoretical and practical information required in all investigations involving chromatography, analytical chemistry, biochemistry, and pharmaceutical research. Among the topics covered are the nature of chromatographic interactions, molecular interpretation of distribution processes in chromatography, topological indices as retention descriptors, and multiparameter structure-chromatographic retention relationships. 1987 (0 471-85983-4) 303 pp. Detectors for Liquid Chromatography Edited by Edward S. Yeung With its singular coverage of this fast-growing field, Detectors for Liquid Chromatography presents the state of the art in this subject area. It offers a comprehensive examination of the basic principles behind the detector response, instrumentation, and selected applications for comparison and evaluation of potential. Specifically, topics given in-depth coverage include polarimetric, indirect absorbance, refractive index detectors, absorption detectors for HPLC, FTIR and fluorometric detection, detection based on electrical and electromechanical measurements, and mass spectroscopy as an on-line detector for HPLC. 1986 (0 471-82169-1) 366 pp.

Pesticide Selectivity Health And The Environment

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Author : Bill Carlile
language : en
Publisher: Cambridge University Press
Release Date : 2006-09-28

Pesticide Selectivity Health And The Environment written by Bill Carlile and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-09-28 with Science categories.

The re-evaluation of many compounds for their long-term toxicity to humans and the environment has resulted in extensive reforms of the pesticide industry. This book explores the actions of pesticides and their effects on non-target organisms, the environment and human health. In addition to the chemical and biological actions of pesticides, the volume covers the regulatory framework within which manufacturers of compounds function, and the influence that pressure groups and the media have on the industry.

Manual On Estimation Of Selectivity For Gillnet And Longline Gears In Abundance Surveys

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Author : Holger Hovgêrd
language : en
Publisher: Food & Agriculture Org.
Release Date : 2008-04-29

Manual On Estimation Of Selectivity For Gillnet And Longline Gears In Abundance Surveys written by Holger Hovgêrd and has been published by Food & Agriculture Org. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-04-29 with Technology & Engineering categories.

This manual defines methods for estimating selectivity of gillnet and longline gears, with particular reference to the use of these gears in abundance surveys. The manual illustrates how gear design, the basic concepts of size selection and fish morphometric data can be used to model selectivity. Statistical estimation methods are described in detail, and examples given of their application in spreadsheets. The efficient use of these gears in abundance and research surveys is also discussed. Although the manual concentrates on gillnets and longlines, the methods given are general enough to be relevant to any research involving gear selectivity