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We investigated the effects of exogenous 5-aminolaevulinate and kryptopyrrole, separately and together, on the porphyrin synthesis of Bacillus subtilis 168. It was confirmed that 5-aminolaevulinate increases the porphyrin content of the culture fluid in the way previously described. In comparison with the basic activity of the bacteria, kryptopyrrole(More)
Four benzo[a]phenothiazines were investigated for their effects on antibody-dependent cellular cytotoxicity (ADCC) and natural killer (NK) cell and blast transformation of human peripheral blood mononuclear cells (PBM). Benzo[a]phenothiazines dose-dependently suppressed the nitrogen-stimulated T cell proliferation. The suppressive effect of non(More)
Numerous porphyrin auxotrophic mutants have been isolated from the 168 trpC2 strain of Bacillus subtilis by selection with streptomycin. Some of them could be supplemented with ALA while the majority grew only in the presence of haemin. Among the latter strains, the syntropism test allowed to distinguish two groups different in phenotype, viz., feeders(More)
Three genes hemE, hemF, hemG taking part in the porphyrin biosynthesis of Bacillus subtilis were mapped by two- and tree-factor transduction crosses. The gene hemE determines uroporphyrinogen decarboxylase (EC the gene hemF coproporyphyrinogen oxidase (EC and the gene hemG, ferrochelatase (EC 4.99. 1.1) enzymes. The loci hemE, hemF, hemG,(More)
Two genes (hemB, hemC) taking part in the porphyrin biosynthesis of Bacillus subtilis were mapped. The gene hemB determines δ-aminolaevulinic acid dehydrase, and the gene hemC prophobilinogen deaminase. The transductants from the experiments were grouped by routine replica plating, and the genotypes of certain recombinant classes were determined by the(More)
The potential neuroleptic-like effect of ampullosporin A, a new peptaibol, isolated from the fungus Sepedonium ampullosporum HKI-0053, was characterized using specific behavioural models and methods. Ampullosporin A (amp) disrupted the retrieval of a well-trained conditioned reaction and normalized the behavioural effects of subchronic ketamine treatment in(More)
Fc receptor-blocking activity, based on the EA rosetting inhibition of anti-Rh(D) gamma-globulin preparations, was determined during biological analyses. After sample purification by means of precipitation with a low concentration of ammonium sulphate, fractions were obtained containing anti-D activity and Fc receptor-blocking activity separately. Fc(More)
delta 9-Tetrahydrocannabinol, cannabidiol, cannabidiolic acid, tetrahydrocannabidiolic acid, cannabispirol, acetylcannabispirol, cannabispirone, and cannabispirenone in a low concentration did not affect the adhesion of Escherichia coli on cultured HEp-2 cells. Cannabinoids at 10(-6) M increased the chemiluminescence of human polymorphonuclear leukocytes,(More)