Library Faculty/Staff Scholarship and Research
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Item On the phagocytosis in vitro of strains of Yersinia pseudotuberculosis after treatment with certain detergents and lipid solvents(Bulgarian Academy of Sciences, 1976) Baykousheva, S.; Veljanov, D.Reproduced from SciFinder with permission from the Chemical Abstracts Service. The addn. of Na lauryl sulfate [151-21-3] or petroleum ether to Y. pseudotuberculosis grown in a medium contg. 10% glycerol at 28° (conditions under which V and W antigens are not synthesized) significantly increased the phagocytosis of the bacterial cells by rabbit blood. The addn. of Na periodate or trypsin [9002-07-7] produced variable degrees of phagocytosis dependent on the virulence of the strains tested. The role of lipid synthesis in the restoration of phagocytosis at 28° is discussed.Item Some biological properties of bacterial lipids(1977) Baykousheva, S; Veljanov, DItem Effect of some chemical agents on biological membranes(1977) Baykousheva, SItem Further studies on the metabolic changes in strains of Salmonella typhimurium and Yersinia pseudotuberculosis after treatment with some detergents and lipid solvents(1977) Veljanov, D; Radoucheva, T; Baykousheva, S; Kussovski, VReproduced from SciFinder, with permission from the Chemical Abstracts Service. Incubation of S. typhimurium and Y. pseudotuberculosis in 30% petroleum ether at 37° inhibited respiration more than did 0.01-0.03% Na lauryl sulfate [151-21-3]. After a 72-h incubation in 10% glycerol [56-81-5] the respiration level returned to, or approached normal. Petroleum ether also inhibited dehydrogenase [9035-82-9] activity and glycolysis more than did Na lauryl sulfate. Incubation in glycerol also reversed this inhibition. Na lauryl sulfate completely and irreversibly inhibited phosphatase [9013-05-2] at pH 5.4 and 8.0. Petroleum ether inhibited phosphatase at pH 5.4 in Y. pseudotuberculosis and at pH 8.0 in S. typhimurium.Item Studies on the ultrastructure of Yersinia pseudotuberculosis after treatment with some detergents and solvents(Gustav Fischer Verlag, Stuttgart, 1977) Cherepova, Nadja; Baykousheva, Svetla; Veljanov, DThe ultrastructural changes in 3 strains Yersinia pseudotuberculosis with different virulence after treatment with sodium lauryl sulfate (SLS) and petroleum ether were studied. The ultrafine sections after treatment with SLS show heavy destructive changes, concerning the cell wall, the cytoplasmic membrane and the inner structure of the cell. It was established that the same cells Y. pseudotuberculosis after cultivation on a medium with glycerol show a tendency to recover their ultrastructure. The cells treated with petroleum ether did not exhibit any notable ultrastructural changes.Item Glucose isomerase(1979) Baykousheva, SItem New concepts about phagocytosis(Bulgarian Academy of Sciences, 1979) Baykousheva, SvetlaItem Bacterial toxins and pathogenesis(1980) Baykousheva, SItem Lipid composition of bacterial and stable L forms of Escherichia coli W 1655 F+(1980) Baykousheva, S; Ivanova, E; Gumpert, J; Toshkov, AItem Bacterial membranes(1980) Baykousheva, SItem Bacterial cell wall and pathogenicity(1980) Baykousheva, SItem New methods of enzyme immobilization(1981) Baykousheva, S; Naidenov, SItem Fatty acid composition of lipids of Escherichia coli W 1655 F+ and its stable protoplast type L-form(1982) Gumpert, J.; Schade, W.; Krebs, D.; Baykousheva, S.; Ivanova, E.; Toshkov, A.The comparative fatty acid analysis of extractable and non-extractable lipids of Escherichia coli W 1655 F+ and its stable protoplast type L-form shows quantitative as well as qualitative differences. From 10 different fatty acids obtained, 16:0, 17:0 and 18:0 were present at about the same quantities in the lipid fractions of the bacterial and L-form. The absence of larger amounts of 12:0, 14:0, and 14:beta-hydroxy fatty acids in the non-extractable L-form lipids reflects the loss of the cell wall in L-form cells. The 16:1 fatty acid was found in L-form lipids, only. This qualitative difference and the 2-3 times higher content of 18:1 in L-form lipids and the 7 times lower content of cyc-19:0 in extractable lipids of the L-form may be interpreted as alterations characteristic of the changed composition of the cytoplasmic membrane in the L-form cells.Item Microbiological transformation of heavy metals in nature(1982) Naidenov, S; Baykousheva, SItem From the cord-factor of mycobacteria to the synthetic immunostimulants(Bulgarian Academy of Sciences, 1983) Baykousheva, SvetlaItem Юджийн Гарфийлд и науката за информацията (Eugene Garfield and information science)(1983) Байкушева, Светла; Baykoucheva, SvetlaAnalysis of the contributions made by Eugene Garfield to information science.Item A Binational Project for the Preservation and Control of Censored Magazines from the Allied Occupation of Japan at the University of Maryland(Council on East Asian Libraries and the Association for Asian Studies, Inc., 1983-06) Shulman, Frank Joseph; Okuizumi, EizaburoItem Specificities in the phospholipid and fatty acid composition of the stable protoplast type L-form of Escherichia coli B(1984) Gumpert, J.; Schade, W.; Krebs, B.; Baykousheva, S.; Ivanova, E.; Toshkov, A.The stable protoplast type L-form cells of E. coli B are twice richer in the extractable lipids than in the parent form. No qualitative differences in the phospholipid and fatty acid composition were found. However, the quantity of C14:0, C17:Δ, and C18:0 differ considerably. Unsaturated fatty acids are prevalent in the L-form cells.Item Electron-microscopic demonstration of the localization of adenosinetriphosphatase in Bacillus subtilis(1984) Cherepova, N.; Baykousheva, S.; Ilieva, K.Histochemical studies and electron microscopy of Bacillus subtilis revealed the presence of ATPase in various subcellular fractions. The enzyme was preferentially localized in mesosomes, cytoplasmic membrane, periplasmic space, and cell wall.Item Ultrastructure of Bacillus subtilis 168 treated with cerulenin(1985) Cherepova, Nadja; Baykousheva, Svetla; Ilieva, Konstantina