New Polyfunctional Biorationals Use to Achieve Competitive Yield of Organic Potatoes in the North-West Russian Ecosystem.

To increase the organic potato yield, it is necessary to provide the crop with sufficient nutrients and effective means of biocontrol the diseases. The research goal was to characterize the biorationals' efficacy to achieve competitive organic potatoes' yield under various weather conditions. A 4-year trial was carried out in the Leningrad region using Udacha variety potatoes.

[An Efficient Method for Genetic Certification of Bacillus subtilis strains, Prospective Producers of Biopreparations].

Genetic certification of commercial strains of bacteria antagonistic to phytopathogenic microorganisms guarantees their unequivocal identification and confirmation of safety. In Russia, unlike EU countries, genetic certification of Bacillus subtilis strains is not used. Based on the previously proposed double digestion selective label (DDSL) fingerprinting, a method for genetic identification and certification of B.

[Isolation and study of antibiotic INA-1132 (chlorothricin), produced by actinomycete strain].

Taxonomic properties of strain INA-1132 producing antibiotic INA-1132 are described. The antibiotic showed activity against grampositive bacteria and fungi. The strain was classified as belonging to the genus Streptomyces and by its taxomic characteristics is most close to S.

[Echinomycin production by Actinomadura sp. INA 654].

An actinomycete strain designated as Actinomadura sp. INA 654 was isolated from a chernozem soil sample in the Voronezh Region by the soil sample treatment with millimetric waves (EHF band). The strain produced an antibiotic complex of 2 components, named A-654-I and A-654-II.

[The activity of the phagocytic bactericidal systems in intact guinea pigs and in guinea pigs immunized against tularemia].

The activities of NADP-oxidase and glucose-6-phosphate dehydrogenase in mononuclear phagocytes and polymorphonuclear leukocytes (PML) during the phagocytosis of Francisella tularensis and the influence of immunization of on the activity of oxygen-dependent metabolism were studied. The phagocytosis of F.tularensis was found to be accompanied by a rise in the activity of NADP.

[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.

[Production of griseoviridin and etamycin by the new culture, Streptomyces albolongus].

An actinomycete strain designated as 4297 was isolated from a soil sample collected near Moscow. The strain produced a complex of two antibiotics. One of them had a broad antibacterial spectrum and, in terms of its physicochemical properties and X-ray structural evidence, was identified with griseoviridin.

[Formation of a streptothricin-group antibiotic by a Streptomyces glaucus 1136 culture].

In screening of new antibiotics a streptomycete (strain 1136) was isolated from a soil sample of Armenia. It showed no antagonistic properties in streek cultures on agarized media. When grown under submerged conditions strain 1136 produced an antibiotic active against grampositive and gramnegative bacteria.

[Polyene antibiotics stability, study of the rate of the heterogeneous destruction of the hepataene antibiotic levorin by an "accelerated aging" method and the possibility of predicting the shelf life of levorin].

The data on stability of levorin of various purity levels stored under natural conditions and under conditions of thermic rapid inactivation are presented. When the ratio of oxygen to the antibiotic was 1 mole/1 mole the kinetic inactivation curve was of a multistage character with periods of active destruction and quasistatic state. The use of thermic inactivation as a method of accelerated aging is substantiated.