Acta Microbiologica Bulgarica最新文献

The preliminary application of the preparation Oxadiarrhot has no effect on the progress and the result of bacterial and mixed (bacterial-viral) infections. In animals treated with the preparation antigen-reactive and antibody-productive cells show insignificant decrease in number. There is no essential influence of the preparation on the mononuclear phagocytes system--the alveolar macrophages and polymorphonuclears do not change their functions.

The mixed microbial culture 189 possesses high biodegradation capacity against dimethylterepthalate (DMT)--a basic substance in polyester fibres production and an environmental pollutant. The process of its degradation was followed and the effect of some external factors (pH, concentration, accompanying substrates) on the growth of the association was shown.

Virulence and susceptibility to phagocytosis of Pseudomonas pseudomallei R- and S-forms for ground squirrels were studied. The alveolar macrophages and blood leucocytes (polymorphonuclear and mononuclear) was used. S-forms survived and multiplied intracellularly more actively in alveolar macrophages than R-forms and their virulence was considerably higher.

The kinetics of gluconic acid biosynthesis of the strain Aspergillus niger 13-73 by submerged cultivation in a medium containing 26% glucose was investigated. The maximum amount of the product was obtained at minimum biomass growth. The yield of the product compared to the theoretical one was 95% and the fermentation period was 42 hours. The results regarding the limitation theory are discussed.

We have found out that one-year-old carps are extremely sensitive to ichthiomycin in concentrations between 25-125 micrograms/dm3. This fact permitted the use of biological methods for determination of ichthiomycin concentrations in cultural medium of Streptomyces levoris 1107 or crude preparations of the antibiotic.

The synergistic effect shown by the combination of a natural product, polyphenolic complex (PC) isolated from Geranium sanguineum L., and rimantadine (R) in vitro and in ovo [7], encouraged us to continue these studies by in vivo testing. A marked protective effect in experimental influenza virus A (H3N2) infection in mice was found when PC was applied nasally (i.n.) (1.0 mg/kg) only once 6 h before infection in combination with R applied orally in concentration 10.5 and 2.5 mg/kg 2h before and 2.24 and 48 h after viral inoculation (PI = 72.55%, 55% and 57.8% respectively).

By a radiometric method using C14 labelled amino acid mixture it was established that the Streptococcus pyogenes A49 L-forms cells invade tissue cultures MK and F in a similar degree as parent bacterium cells. The L-form cells are not able to enter the HeLa and Pulmo tissue culture cells but the parent bacterium cells produce well expressed peak of isotope take-up at the 8th hour of the observation.

The microbial association 189 was isolated from soil treated with dimethylterephthalate (DMT) for a long time. The dynamics of its growth, respectively the degradation of the terephthalate ester known as an environmental pollutant has been studied.

It was established that the stable E. coli WF+ L-form cytoplasmic membranes (CM) increase the antibody response in rabbit during experimental hyperimmunization with cells of Streptococcus pyogenes A49 and Proteus mirabilis D52. Using the skin-induration test and the reaction for aggregation of macrophages in presence of homologous antigens it was established that CM increase the cell-mediated immunity of guinea-pigs to protein antigens of the same bacterial strains.

Studies were carried out on the virucidal and antiviral effects of Melissa officinalis L. extracts (M1, M3, M3 and M4) with respect to Herpes simplex virus type 1 (HSV-1). Virucidal effect was registered within 3 and 6 hours of treatment using M4 administered in MTC. The remaining extracts inactivate the virus at the 12th and 24th hour. No significant values of inhibiting activity of M1, M2, and M3 on the same virus in vitro or in vivo were demonstrated. The presence of caffeic, rosmarinic and ferulic acids was demonstrated by thin-layer chromatography. Their role in the antiviral activity of M. officinalis L. is discussed.