Fortschritte der Chemie organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products / Progrès Dans La Chimie Des Substances Organiques Naturelles PDF Download
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Author:
Publisher: Springer Science & Business Media
ISBN: 3709171792
Category : Science
Languages : de
Pages : 426
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Book Description
Author:
Publisher: Springer Science & Business Media
ISBN: 3709171792
Category : Science
Languages : de
Pages : 426
Get Book Here
Book Description
Author:
Publisher: Springer-Verlag
ISBN: 3709171458
Category : Science
Languages : de
Pages : 380
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Book Description
Author: P. R. Ashurst
Publisher: Springer
ISBN: 9783709181669
Category : Science
Languages : en
Pages : 350
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Mit Beiträgen zahlreicher Fachwissenschaftler
Author:
Publisher: Springer Science & Business Media
ISBN: 3709180147
Category : Science
Languages : de
Pages : 469
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Book Description
The properties of proteins are determined not only by the sequence of amino-acid residues in the polypeptide chains, but also by the con figuration of the chains-the way in which the chains are coiled or folded. It is probable that denaturation, the loss of some of the specific properties of a native protein, may in many cases be the result simply of a change in configuration of the polypeptide chains, without any change whatever in the sequence of amino-acid residues. During the past few years great progress has been made in the attack on the determination of the sequence of amino-acid residues in the poly peptide chains of proteins, through the work of SANGER and his collabora tors (Io9, IIO) and of other investigators. There has also been significant progress in the attack on the problem of the configuration of polypeptide chains, largely through the application of the X-ray diffraction technique.
Author:
Publisher: Springer Science & Business Media
ISBN: 3709171563
Category : Science
Languages : de
Pages : 429
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Author:
Publisher: Springer Science & Business Media
ISBN: 3709181437
Category : Science
Languages : de
Pages : 486
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During the past three decades the organic chemist has become in creasingly used to take advantage of more and more complex instrumenta tion and physical measurements in lieu of laborious, time-consuming and often ambiguous chemical transformations. Mass spectrometry is perhaps the most recent, most complex and most expensive addition to this field. In view of the astonishingly quick acceptance of nuclear magnetic reso nance by the organic chemist it is, in retrospect, surprising that he has neglected mass spectrometry for such a long time. This can be explained, in part, by the complexity of the instrumentation and some technical shortcomings of the earlier commercially available instruments but, to an even greater extent, it reflects also the prejudices against a technique that was originally mainly used for quantitative gas analysis. The usefulness of mass spectrometry as a qualitative technique in organic chemistry rather than a tool for quantitative analysis was more and more recognized towards the end of the last decade. A rather spectacular development followed during the intervening few years to the point that now any reasonably well equipped modern organic laboratory is supplied with, or at least has access to, one or more mass spectrometers suitable for work on organic compounds. Within the realm of organic chemistry the technique has become much more important, if not indispensable, for the natural products chemist while its application to synthetic problems is much less pro nounced.
Author:
Publisher: Springer Science & Business Media
ISBN: 3709171695
Category : Science
Languages : de
Pages : 547
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Author: 3Island Press
Publisher:
ISBN: 9783709181652
Category :
Languages : en
Pages : 368
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Author:
Publisher: Springer Science & Business Media
ISBN: 3709171660
Category : Science
Languages : de
Pages : 561
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Substances belonging to this group of organic compounds are wi,lely distributed in Nature, being found in plants, both higher and lower fungi and, upto the present time, in one animal source, sheep wool-fat. For a long time no real differentiation was possible between the tetra- and penta cyclic triterpenes and the sterols. Then the two latter became disting uishable by their selenium. ·dehydrogenation products, i. e. , picene and naphthalene derivatives from the pentacyclic triterpenes and DIELS' hydrocarbon from the sterols. It is now apparent that those compounds yielding predominantly I: 2: 8-trimethylphenanthrene on dehydro genation represent yet another class, and this property is regarded as typical of the tetracyclic triterpenes. The group contains both C and C 30 3l compounds and, although the latter fall outside RUZICKA'S strict definition of triterpenes (I42), it seems desirable to permit this deviation. Members with thirty-two carbon atoms may well be discovered in due course. In a most· valuable account of the triterpenes written in I949, JEGER. (II3) was able to summarize all that was known about the tetra cyclic group in a very small compass. Most of the work discussed in the present article has been published during the last five years and in that time the structures of some twenty compounds have been elucidated. Of outstanding importance is the revelation of close structural relation ships tQ the steroids, and the presence of C and C side-chains, skeletally 8 9 identical with those of cholesterol and ergosterol.
Author:
Publisher: Springer
ISBN: 9783211805770
Category : Science
Languages : de
Pages : 420
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Book Description
