Progress in the chemistry of organic natural products
Author: W. Herz
Publisher: Springer Verlag
Published: 1986-02-01
Total Pages: 285
ISBN-13: 9780387818863
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Author: W. Herz
Publisher: Springer Verlag
Published: 1986-02-01
Total Pages: 285
ISBN-13: 9780387818863
DOWNLOAD EBOOKAuthor: E. Fattorusso
Publisher: Springer Science & Business Media
Published: 1997-09-30
Total Pages: 354
ISBN-13: 9783211828793
DOWNLOAD EBOOKThe volumes of this classic series, now referred to simply as "Zechmeister” after its founder, L. Zechmeister, have appeared under the Springer Imprint ever since the series’ inauguration in 1938. The volumes contain contributions on various topics related to the origin, distribution, chemistry, synthesis, biochemistry, function or use of various classes of naturally occurring substances ranging from small molecules to biopolymers. Each contribution is written by a recognized authority in his field and provides a comprehensive and up-to-date review of the topic in question. Addressed to biologists, technologists, and chemists alike, the series can be used by the expert as a source of information and literature citations and by the non-expert as a means of orientation in a rapidly developing discipline.
Author: A. Douglas Kinghorn
Publisher: Springer Science & Business Media
Published: 2010-03-03
Total Pages: 185
ISBN-13: 3211996613
DOWNLOAD EBOOKResin glycosides are part of a very extensive family of secondary metabolites known as glycolipids or lipo-oligosaccharides and are constituents of complex resins (glycoresins) (1) unique to the morning glory family, Convolvulaceae (2). These active principles are responsible for the drastic purgative action of all the important Convolvulaceous species used in traditional medicine throughout the world since ancient times. Several commercial purgative crude drugs can be prepared from the roots of different species of Mexican morning glories. Their incorporation as therapeutic agents in Europe is an outstanding example of the assimilation of botanical drugs from the Americas as substitutes for traditional Old World remedies (3). Even though phytochemical investigations on the constituents of these drugs were initiated during the second half of the nineteenth century, the structure of their active ingredients still remains poorly known for some examples of these purgative roots. During the last two decades, the higher resolution c- abilities of modern analytical isolation techniques used in conjunction with pow- ful spectroscopic methods have facilitated the elucidation of the active principles of these relevant herbal products. This chapter describes the ethnobotanical information associated with the p- gative morning glory species and how traditional usages were instrumental in plant selection for chemical studies. The advantages and limitations of available analy- cal techniques for the isolation, puri?cation, and structure characterization of the individual constituents of these complex glycoconjugates are also discussed.
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Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 426
ISBN-13: 3709171792
DOWNLOAD EBOOKAuthor: R. D. H. Murray
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 683
ISBN-13: 370916172X
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Publisher: Springer-Verlag
Published: 2013-03-07
Total Pages: 380
ISBN-13: 3709171458
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Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 547
ISBN-13: 3709171695
DOWNLOAD EBOOKAuthor: T. Fukai
Publisher:
Published: 1998
Total Pages: 162
ISBN-13:
DOWNLOAD EBOOKAuthor: M. Glasenapp-Breiling
Publisher: Springer
Published: 2012-07-04
Total Pages: 253
ISBN-13: 9783709161616
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Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 469
ISBN-13: 3709180147
DOWNLOAD EBOOKThe 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.