[A new metabolite with fungistatic and bacteriostatic activity, produced by strain L-30 of Flavobacterium sp].

Flavocin, an agent with fungistatic and bacteriostatic activities, was isolated from the culture of Flavobacterium sp. L-30. The data on the physico-chemical and biological properties of flavocin A, the major active component, are presented.

[The characteristics of alirin B1--the basic component of a fungicidal preparation produced by the Bacillus subtilis 10-VIZR strain].

Alirin B1, the major active component of a fungicidal complex produced by Bacillus subtilis 10-VIZR was separated. Its physico-chemical and biological properties as well as the amino acid composition were investigated. Alirin B1 was shown to differ from the polypeptide substances described in the literature.

[Askostatin--a fungicide from Streptomyces viridovulgaris].

Askostatin is a fungicide isolated from the culture of Streptomyces viridovulgaris. It was separated by the countercurrent distribution procedure into components A and B. By the mass and NMR spectra and the biological findings the components were identified with cycloheximide and isocycloheximide respectively.

[Aglycone structure of the polyene antibiotic, gannibamycin].

Functional analysis of gannibamycin, a new macrolide pentaenic antibiotic was performed. It was found that the antibiotic contained carbonyl, carboxyl group and one molecule of nitrogen and no isolated double bonds. The antibiotic did not participate in the reaction of retroaldol splitting.

[Characteristics of a new aromatic heptaenic antibiotic, flavumycin A].

The study of the products of alkaline and acid hydrolysis showed that flavumycin A included mycosamine, an aminosugar and n-aminoacetophen, an aromatic fragment. The main functional groups of the antibiotics aglicone were determined.

[New heptaene antibiotic, flavomycin, formed by Act. flavus var. geptinicus var. nov].

An actinomycetous culture LIA-0734 was isolated from a soil sample. By its morphologo-cultural properties it was close to Act. flavus and differed from the latter in the sporophores, colour of the substrate mycelium on synthetic media amd markedly pronounced antagonism with respect to yeasts and yeast-like fungi.

[Actinomyces fulvoviolaceus ver. achromogenes var. nov., a producer of the new heptaene complex, fulvomycin].

An actinomycetous culture designated as LIA-0721 was isolated from a soil sample. It was close to Act. fulvoviolaceus by its morphologo-cultural features and differed from it in production of melanoid pigments and the spectrum of carbohydrate assimilation.