[Controlled search for the producers of ionophore antibiotics among Streptomycetes].

A procedure was developed for directed screening of cultures producing ionophore antibiotics among streptomycetes. The procedure is based on measuring the membrane potential generated in the presence of the Men+/nH+ = -expchanger-protonophore couple. It provided isolation of cultures producing ionophore antibiotics at the fermentation broth stage.

[Kafamycin--a new pyrrol ether antibiotic].

Cafamycin is a novel polyether antibiotic active against gram-positive bacteria. It was isolated from the culture fluid of Streptomyces sp., an organism producing the anthracycline antibiotic galtamycin.

[The antibiotic galtamycin. Its fermentation, isolation, physicochemical and biological properties].

A culture of Streptomyces sp., producing an antibiotic named galtamycin was isolated from a soil sample collected in the Gorno-Altai Autonomous Region. The antibiotic belongs to anthracyclines.

[Stability of the antibiotic formation trait of the tobramycin producer Streptomyces cremeus subsp. tobramycini].

The stability of the tobramycin-producing organism was studied by the property of the antibiotic production. The organism was stored under conditions of different exposures to light and subculture on slants. The culture was also subjected to long-term storage with various methods.