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PubMedDate not supplied

[Analysis of the trace contaminants in the atmosphere formed by the life-support environment of the closed system of man-higher plants-lower plants-microorganisms].

Trace contaminants in the air of a biological life support system which was continuously complicated were examined. Air samples were taken by cooled traps and analyzed by gas chromatography. Changes in the air of the biological life support system as a function of its structure were compared using Hamming distance and composition similarity measures. Matrices of the measures were obtained and a graph whose structure corresponded to changes in the biological life support system was constructed. During prolonged experiments trace contaminants remained relatively stable and changed when a mineralization component was attached. It is concluded that the composition and variations in the organic components of the atmosphere can be used as an integral indicator of the function of the biological life support system as a whole.

Air Pollutants↗
PubMed2000

A New Biosynthetic Pathway to Alkaloids in Plants: Acetogenic Isoquinolines We thank Dr. D. Marek and Dr. D. Moskau (Bruker AG, Fällanden, Switzerland), who made the cryoprobe technique available to us, Prof. L. Aké Assi (Centre National de Floristique, Abidjan Ivory Coast) for a long and fruitful collaboration on Dioncophyllaceae and Ancistrocladaceae plants, and Dr. D. Scheutzow (Universität Würzburg) for valuable advice. This work was supported by the Deutsche Forschungsgemeinschaft (SFB 251 and Graduiertenkolleg "NMR in vivo und in vitro"), by the Fonds der Chemischen Industrie, and by the Max-Buchner-Stiftung.

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Journal Article↗
PubMed1986

Possible mechanism of steroid action of the plant herb extracts glycyrrhizin, glycyrrhetinic acid, and paeoniflorin: inhibition by plant herb extracts of steroid protein binding in the rabbit.

To assess the action of some components of herbal medicine, glycyrrhizin, glycyrrhetinic acid, and paeoniflorin, on steroids, their binding to several classes of intracellular and serum steroid-binding proteins were studied in the rabbit. The affinity (inhibitor constant) for binding of dihydrotestosterone-sex hormone binding globulin in the serum (dissociation constant of 2.0 nmol/L for dihydrotestosterone) was approximately 520 nmol/L, and that for the binding of cortisol-corticosteroid-binding globulin in the serum (dissociation constant of 2.0 nmol/L for cortisol) was approximately 10 mumol/L. In the uterine cytosol, the inhibitor constant value for estradiol receptor binding (dissociation constant of 1.0 nmol/L) was 0.9 mumol/L, and these compounds did not influence progestin receptor binding (dissociation constant of 1.4 nmol/L). The inhibitor constant values for glucocorticoid receptor binding (dissociation constant of 1.0 nmol/L) in the liver cytosol were 3.0 nmol/L for paeoniflorin, 2.0 nmol/L for glycyrrhizin, and 1.7 nmol/L for glycyrrhetinic acid, and those for mineralocorticoid receptor binding (dissociation constant = 1.1 nmol/L) in the kidney cytosol were 3.5 nmol/L for paeoniflorin and glycyrrhetinic acid and 3.0 nmol/L for glycyrrhizin. These results suggest that herbal extracts such as the above compounds influence steroid effects by glucocorticoid and mineralocorticoid receptors and to a lesser extent by estrogen receptors or serum sex hormone-binding globulin and corticosteroid-binding globulin.

Animals↗