Synthèse et étude des propriétés physico-chimiques de la poly-l-méthionine en solution PDF Download
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Author: A.. Belhaj-Soulami
Publisher:
ISBN:
Category :
Languages : fr
Pages : 136
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Book Description
Nous avons choisi l'étude de la polyméthionine pour plusieurs raisons : d'une part ce polymère fait l'objet de peu de recherche jusqu'à présent. D'autre part, on peut assez facilement préparer des échantillons optiquement purs, solubles dans un certain nombre de solvants transparents dans l'infrarouge ou dans l'ultraviolet lointain. Enfin ce polymère présente l'avantage de posséder une fonction thioéther, sur la chaîne latérale. Par transformation chimique de celle-ci, on peut en particulier préparer un polyion par iodométhylation par exemple. Ce polyion étant soluble dans l'eau, on voit l'intérêt que pourrait présenter l'étude physicochimique d'un tel produit en solution aqueuse. Nous commencerons par donner un aperçu de l'étude conformationnelle des homopolypeptides et des principales méthodes utilisées pour caractériser les conformations adoptées. Nous décrirons ensuite le mode de synthèse de la polyméthionine à partir du N-carboxy-anhydride de la L-méthionine. Puis nous examinerons le comportement de ce polymère dans des solvants simples par viscosimétrie, dispersion rotatoire optique, spectrométrie dans l'utraviolet lointain et absorption du rayonnement infrarouge. Nous étudierons aussi les transitions hélice-pelote dans des mélanges de solvants à l'aide de la viscosimétrie et de la dispersion rotatoire optique. Enfin nous décrirons en conclusion le comportement de la poly-L-méthionine dans un certain nombre de solvants simples ou binaires et nous mentionnerons les points qui, à notre avis, justifieraient une étude approfondie.
Author: A.. Belhaj-Soulami
Publisher:
ISBN:
Category :
Languages : fr
Pages : 136
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Book Description
Nous avons choisi l'étude de la polyméthionine pour plusieurs raisons : d'une part ce polymère fait l'objet de peu de recherche jusqu'à présent. D'autre part, on peut assez facilement préparer des échantillons optiquement purs, solubles dans un certain nombre de solvants transparents dans l'infrarouge ou dans l'ultraviolet lointain. Enfin ce polymère présente l'avantage de posséder une fonction thioéther, sur la chaîne latérale. Par transformation chimique de celle-ci, on peut en particulier préparer un polyion par iodométhylation par exemple. Ce polyion étant soluble dans l'eau, on voit l'intérêt que pourrait présenter l'étude physicochimique d'un tel produit en solution aqueuse. Nous commencerons par donner un aperçu de l'étude conformationnelle des homopolypeptides et des principales méthodes utilisées pour caractériser les conformations adoptées. Nous décrirons ensuite le mode de synthèse de la polyméthionine à partir du N-carboxy-anhydride de la L-méthionine. Puis nous examinerons le comportement de ce polymère dans des solvants simples par viscosimétrie, dispersion rotatoire optique, spectrométrie dans l'utraviolet lointain et absorption du rayonnement infrarouge. Nous étudierons aussi les transitions hélice-pelote dans des mélanges de solvants à l'aide de la viscosimétrie et de la dispersion rotatoire optique. Enfin nous décrirons en conclusion le comportement de la poly-L-méthionine dans un certain nombre de solvants simples ou binaires et nous mentionnerons les points qui, à notre avis, justifieraient une étude approfondie.
Author: Paul Lloyd-Williams
Publisher: CRC Press
ISBN: 9780849391422
Category : Medical
Languages : en
Pages : 306
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Book Description
Organic chemists working on the synthesis of natural products have long found a special challenge in the preparation of peptides and proteins. However, more reliable, more efficient synthetic preparation methods have been developed in recent years. This reference evaluates the most important synthesis methods available today, and also considers methods that show promise for future applications. This text describes the state of the art in efficient synthetic methods for the synthesis of both natural and artificial large peptide and protein molecules. Subjects include an introduction to basic topics, linear solid-phase synthesis of peptides, peptide synthesis in solution, convergent solid-phase synthesis, methods for the synthesis of branched peptides, formation of disulfide bridges, and more. The book emphasizes strategies and tactics that must be considered for the successful synthesis of peptides.
Author: Edward R.(Ted) Farnworth
Publisher: CRC Press
ISBN: 020300972X
Category : Technology & Engineering
Languages : en
Pages : 408
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Book Description
Fermented foods have been an important part of the human diet in many cultures for many centuries. Modern research, especially on the immune system, is revealing how these foods and their active ingredients impact human health. Handbook of Fermented Functional Foods presents the latest data on fermented food products, their production processes, an
Author: A. Bairati
Publisher: Springer Science & Business Media
ISBN: 146847636X
Category : Science
Languages : en
Pages : 582
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Book Description
Knowledge in the field of the biology of the extracellular matrix, and in particular of collagen, has made considerable progress over the last ten years, especially in mammals, birds and ln man with respect to very important applied medical aspects. Basic knowledge in the animal kingdom overall has increased more slowly and haphazardly. We, therefore, considered it useful to organize a meeting specifically devoted to the study of the invertebrate and lower vertebrate collagens. The NATO Scientific Division financed an Advanced Research Workshop aimed at bringing together experts qualified in collagen biology (with morphological, biochemical and genetic specialization) with researchers who are currently studying collagenous tissues of invertebrates and lower vertebrates. The Medical-Biology Committee of the CNR-Rome and the University of Milan also supplied interest and support for the organization of this Meeting. The format of the workshop consisted in: 1) main lectures on the most recent aspects of collagen biology; 2) minireviews on the current knowledge of collagenous tissues in the various invertebrate phyla and in fish; 3) contributed papers on particular aspects of research in specific fields; 4) workshops on the methodology of studying collagen. As we had intended, the Workshop gave a comprehensive overview of acquired knowledge and of the present state of research actlvlty. It permitted wide interdisciplinary discussion, enabling collabora tions to be established and new research themes to be chosen. This volume contains the text of all the contributions presented at the Meeting, including posters.
Author: International Atomic Energy Agency
Publisher:
ISBN:
Category : Medical
Languages : en
Pages : 632
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Book Description
Soil-plant animal relations regarding minerals; Trace elements in animal nutrition; Trace elements in animal nutrition; Calcium; Phosphorus and magnesium metabolism; Protein (nitrogen) metabolism - ruminants; Protein (nitrogen) metabolism - non-ruminants; Nuclear techniques in the control of parasitic infections; Animal endocrinology with special emphasis on radioimmunoassays.
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1336
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Book Description
Author: Douglas G. Hayes
Publisher: Elsevier
ISBN: 0128127066
Category : Science
Languages : en
Pages : 544
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Book Description
Biobased Surfactants: Synthesis, Properties, and Applications, Second Edition, covers biosurfactant synthesis and applications and demonstrates how to reduce manufacturing and purification costs, impurities, and by-products. Fully updated, this book covers surfactants in biomedical applications, detergents, personal care, food, pharmaceuticals, cosmetics, and nanotechnology. It reflects on the latest developments in biobased surfactant science and provides case scenarios to guide readers in efficient and effective biobased surfactant application, along with strategies for research into new applications. This book is written from a biorefinery-based perspective by an international team of experts and acts as a key text for researchers and practitioners involved in the synthesis, utilization, and development of biobased surfactants. Describes new and emerging biobased surfactants and their synthesis and development Showcases an interdisciplinary approach to the topic, featuring applications to chemistry, biotechnology, biomedicine, and other areas Presents the entire lifecycle of biobased surfactants in detail
Author: Jean Swings
Publisher: Springer Science & Business Media
ISBN: 9401115265
Category : Technology & Engineering
Languages : en
Pages : 408
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Book Description
Xanthomonas is a bacterial plant pathogen which infects a wide range of crops worldwide. This book presents an overview of the host plants and the diseases caused by the pathogen on different crops.
Author: Alessandra Zambonelli
Publisher: Springer
ISBN: 331931436X
Category : Science
Languages : en
Pages : 431
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Book Description
This book focuses on the taxonomic diversity of the genus Tuber as economically important truffles. In contributions by internationally respected scientists, it examines truffle systematics, interactions with abiotic and biotic environments, strategies for spore dispersal, and molecular processes in truffles. Topics discussed include: evolutionary theories and phylogeny of Tuber species from Asia, Europe and North-America; the influence of climate on the natural distribution of Tuber species and fruiting body production, soil characteristics and vegetation in natural habitats; tools for tracing truffles in soil, host diversity, truffle inhabiting fungi and truffle-associated bacteria; and the relationships of small mammals and wild boars with truffles, as well as the smell of truffles.This book offers a valuable reference guide for all researchers working in the fields of mycology, ecology and the soil sciences, and will also be useful for farmers and foresters interested in truffle cultivation worldwide.
Author: Philip R. Ashurst
Publisher: Springer Science & Business Media
ISBN: 1461311195
Category : Technology & Engineering
Languages : en
Pages : 418
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Book Description
The issue of food authenticity is not new. For centuries unscrupulous farmers and traders have attempted to 'extend', or othewise alter, their products to maximise revenues. In recent years the subject has reached new prominence and there even have been situations where food authenticity has featured as a newspaper headline in various countries. Food legislation covering the definition, and in some cases composition, of various commodities has been in place in developed countries for many years and paradoxically it is the legislative trend away from emphasis on composition and more on accurate and truthfullabeliing that has been one driving force for the authenticity issue. Another, and many would speculate as the more potent, driving force is the move towards fewer and larger supermarket chains in many countries. Such trading companies with their images of quality products, buying power and commercial standing, exercise considerable commercial power which has been claimed as a significant source of financial pressure on food prices and food commodity product quality. For whatever reason, recent food authenticity issues have become news and consumers, the media and enforcement authorities are showing more interest than ever before in the subject.
