Rapamycin (ay-22, 989), a new antifungal antibiotic i. taxonomy of the producing streptomycete and isolation of the active principle
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TLDR
From its characteristic ultraviolet absorption spectrum rapamycin can be classified as a triene and its activity is compared with that of amphotericin B, candicidin and nystatin.Abstract:
A streptomycete was isolated from an Easter Island soil sample and found to inhibit Candida albicans, Microsporum gypseum and Trichophyton granulosum. The antibiotic-producing microorganism was characterized and identified as Streptomyces hygroscopicus. The antifungal principle was extracted with organic solvent from the mycelium, isolated in crystalline form and named rapamycin. Rapamycin is mainly active against Candida albicans; minimum inhibitory concentration against ten strains ranged from 0.02 to 0.2 mug/ml. Its apparent activity against Microsporum gypseum and Trichophyton granulosum is lower because of its instability in culture media on prolonged incubation required by these fungi. No activity was observed against gram-positive and gram-negative bacteria. Acute toxicity in mice is low.read more
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References
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Journal Article
Protein Measurement with the Folin Phenol Reagent
TL;DR: Procedures are described for measuring protein in solution or after precipitation with acids or other agents, and for the determination of as little as 0.2 gamma of protein.
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Journal ArticleDOI
Methods for characterization of Streptomyces species
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Simplified, Accurate Method for Antibiotic Assay of Clinical Specimens
TL;DR: Serum specimens are tested directly rather than diluting them to a narrow range of antibiotic concentrations, possible because of a procedure for calculations that recognizes the curvilinear relationship between zone sizes and antibiotic concentrations.