[The effect of methylated cyclodextrin on pertussis toxin accumulation in a Bordetella pertussis culture in a bioreactor]. / Vliianie metilirovannogo tsiklodekstrina na nakoplenie kokliushnogo toksina v kul'ture Bordetella pertussis v bioreaktore.

The results obtained in the study of the influence methylated cyclodextrin (beta CD) on the growth of B. pertussis and the accumulation of pertussis toxin in the course of submerged batch cultivation in a bioreactor are presented. As demonstrated by these results, the presence of beta CD in the culture medium in a dose of 0.1 ml/l in the growth deceleration phase causes a tenfold increase in the synthesis of pertussis toxin by microbial cells in comparison with conditions characterized by the absence of beta CD. It cannot by ruled out that beta CD may act as a stressor which influences the synthesis of pertussis toxin, protector protein making it possible for the microbe to survive under new conditions.

[The isolation amd study of lipopolysaccharide from Klebsiella pneumoniae vaccinal strain 204]. / Vydelenie i izuchenie lipopolisakharida Klebsiella pneumoniae vaktsinnogo shtamma 204.

K. pneumoniae lipopolysaccharide (LPS) was isolated from biomass grown under the conditions of controlled multicycle and continuous cultivation. A considerable yield of LPS containing the minimal amount of protein and nucleic acid admixtures was obtained from biomass grown by continuous cultivation with the concentration of glucose in the medium equal to 20 g/l and the content of dissolved oxygen at a level of 0% of complete saturation. Erythrocyte diagnosticum prepared on the basis of this LPS was found to have a sensitizing dose of 100 micrograms per ml of solid erythrocytic precipitate and high specificity, studied in the passive hemagglutination test with the use of rabbit sera.

[The effect of the processes of Klebsiella pneumoniae cultivation on the antigenic activity of vaccinal preparations for peroral use]. / Vliianie protsessov kul'tivirovaniia Klebsiella pneumoniae na antigennuiu aktivnost' vaktsinnykh preparatov dlia peroral'nogo primeneniia.

Whole-cell preparations, obtained from the microbial mass of K. pneumoniae grown by batch and continuous cultivation at a dilution rate of 0.24 and 0.41 hr-1 and used in animal experiments for oral administration, were shown to have different serological activity. The preparation obtained from biomass grown by continuous cultivation at a dilution rate of 0.41 hr-1 proved to be most active regarding the level of hemagglutinating antibodies to K. pneumoniae LPS. At the same time the 360-fold rise of the level of anti-LPS antibodies in rabbit immune sera was observed. On day 258 oral revaccination was made; after that the twofold rise of the level of anti-LPS antibodies in the sera of the animals was observed. These antibody levels exceeded 40-fold those registered before primary immunization, and sufficiently high antibody levels were retained for 4 more months (the term of observation).

[The effect of the conditions of the controlled cultivation of Neisseria meningitidis on the lipopolysaccharide yield]. / Vliianie uslovii upravliaemogo kul'tivirovaniia Neisseria meningitidis na vykhod lipopolisakharida.

The preparations of lipopolysaccharide (LPS) were obtained from N.meningitidis cells grown in synthetic nutrient medium in a fermenter. Different N.meningitidis strains, groups A, B, C, were found to give different yield of the preparation of LPS: the maximum yield was obtained from N.meningitidis cells C 133 and the minimum yield, from N.meningitidis cells B 125. The comparison of group B strains 125 and 150 showed that the former gave a higher yield of LPS. The influence of the phase of growth on the yield of the preparation of LPS obtained from N.meningitidis cells 125 was shown to be manifested under the conditions of oxygen excess; in the exponential phase the highest yield of the preparation was observed. Oxygen dissolved in the medium was found to influence the yield of the preparation of LPS: with the same content of glucose in the medium the yield of LPS was higher under the conditions of the limited concentration of oxygen; with the same concentration of oxygen in the medium the yield of LPS increased with the increase of the concentration of glucose.

[The antibody response of animals to a corpuscular meningococcal group-B preparation with different methods of immunization]. / Antitel'nyi otvet zhivotnykh na korpuskuliarnyi meningokokkovyi serogruppy B preparat pri razlichnykh metodakh immunizatsii.

As revealed in animal experiments, the formation of antibodies to group-B N. meningitidis antigens (group-specific polysaccharide, lipopolysaccharide and outer membrane proteins) in response to administration of meningococcal corpuscular preparations depends on the method of administration, the dose, and the number of administrations. In the sera of rabbits, immunized orally, antibodies to all three antigens in sufficiently high titers have been detected.