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4,877 Result(s)
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Chapter
Some Current Concepts of the Chemical Nature of Antigens and Antibodies
The basic principles of immunological phenomena have developed to a point where antigen-antibody reactions are an integral part of fundamental biochemistry and an important tool for the physical chemist. This ...
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Current Theories on the Origin of Life
To modern scientists, the origin of life seems one of the most difficult of all problems. This was not always so. From classic Greek times until the middle of the 19th century it was generally accepted that li...
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Article
Studies in the field of depsipeptides LI. Mass-spectrometric study of cyclotetradepsipeptides of regular structure
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The mass-spectrometric behavior of various cyclotetradepsipeptides of regular structure has shown that the CO
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Article
The glycosides ofEleutherococcus senticoccus Max. I. Isolation and some properties of eleutherosides B and E
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From the roots of prickly eleutherococcus (Eleutherococcus senticoccus Max.) we have isolated a physiological...
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Article
The glycosides ofApocynum androsaemifolium L. II. The structure of apobioside
The roots of the plantApocynum androsaemifolium L. contain a new steroid diglycoside, apobioside, which has the structure cannogenin-(3)-β-D-cymaropyranoside-(4)-β-D-glucopyranoside.
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Article
Reduction of some D-homosteroids with an aromatic a ring by alkali metals under the conditions of the birch reaction. I
In the Birch reduction of steroid compounds with a phenylbutadiene grou**, i.e., the ketal of 3-methoxy-Δ1, 3, 5(10), 8, 14-D-homoestrapentaen-17a-one (III), the corresponding ketone (IIIa), and 3-methoxy-Δ1, 3...
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Article
The structure of the alkaloid renardine. III. Structure of dihydrodesoxyotonecine
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N-methyl-N-(β-carboxyethyl)-γ-amino-α-methylbutyric acid is a product of oxidative degradation of dihydrodeso...
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Article
The flavonoids of the cruciferae I; robinin and zhealin from the fruit ofCheiranthus allionii
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The triglycoside robinin and a new diglycoside, zhealin, have been isolated from the fruit ofCheiranthus alli...
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Article
Glycosides from ginseng roots IV. Isolation of new glycosides from ginseng
1. New glycosides — panaxosides C, D, E, and F — have been isolated from the root of ginseng by partition chromatography.
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Article
The saponin ofAcanthophyllum gypsophiloides
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Article
Reduction of some D-homosteroids with an aromatic a ring with alkali metals under the conditions of Birch's reaction. II.
1. The reduction of 3-methoxy-D-homoestra-1, 3, 5(10), 8-tetraen-17aβ-ol (IV) with alkali metals in the presence of ammonium chloride or alcohol gives, in addition to 8β, 9α-dihydro derivatives, the 8α, 9α and...
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Article
Elucidation of the composition of pastinacin and isolation of sphondin
A preparation of pastinacin has been separated by preparative chromatography on acidic alumina into three isomeric monomethylfurocoumarin components, bergaptene, sphondin, and xanthotoxin. Their ratio in the p...
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Article
Synthesis and study of the properties of 6-O-(α-L-aspartyl)-D-glucose
1. The carbodiimide method has been used for the first time for the synthesis of aminoacyl derivatives of glucose with aspartic acid.
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Article
Substrate specificity of microbiological conversions of steroids by means ofActinomyces albus ATCC 3006
In a comparison of the substrate specificity of the action of a culture ofActinomyces albus 3006 and a cell-free preparation obtained from the mycelium ofA. albus 3006, it was found that the spectrum of the actio...
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Article
Variants of the complete synthesis of d,l-19-nortestosterone, d,l-19-norandrost-4-ene-3, 17-dione, and their stereoisomers
The complete synthesis of d,l-19-nortestosterone (I) and its 8-iso- and 9, 10-iso- stereoisomers, and also the synthesis of d,l-19-norandrosten-4-ene-3, 17-dione (VI) and its 9, 10-iso-stereoisomer (IX), has been...
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Article
Diterpene hydrocarbons of the resin ofPinus sibirica R. Mayr.
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Article
Glycosides from ginseng roots. VI. Structure of the carbohydrate chain of panaxoside A
The structure of the carbohydrate part of panaxoside A has been established by methylation with subsequent hydrolysis and identification of the methylated monosaccharides.
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Article
Cardenolides of the pods ofOrnithogalum magnum Krasch. et Schischk
Steroid glycosides of the cardenolide group have been found inOrnithogalum magnum.
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Article
Variants of the complete synthesis of d,l-estrone from 1-vinyl-6-methoxytetralol and 2-methylcyclopentane-1,3-dione
Various routes for the synthesis of the methyl ether of d,l-estrone (XI) and of d,l-estrone itself (XIII) have been investigated. The best results were obtained by synthesis according to the route IV → V → VI → I...
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Article
The fatty acid composition of the phospholipids of cottonseed oil
1. The phospholipids of cottonseed oil contain ten fatty acids.