Microbial Polysaccharides
Mostrando 13-24 de 39 artigos, teses e dissertações.
-
13. Avaliação da produção de exopolissacarideo insoluvel por duas linhagens de Agrobacterium sp
Some bacteria of Agrobacterium genus isolated from soil samples and not pathogenic produce two extracellular polysaccharides: an acid and soluble succinoglycan and curdlan gum, an insoluble and neutral polymer. The last one, which received the approval of the FDA - Food and Drug Administration - USA - in 1996, is usually used in food industry because of its
Publicado em: 2002
-
14. Potencial cariogenico "in vitro" de estreptococos grupo mutans da cavidade bucal e seu significado em relação a carie dentaria
In order to analyze the cariogenic potential of some group mutans streptococci species, isolated and in association, by formation of "in vitro" bacterial plaque, production of extracellular polysaccharides and acid production capacity, strains of those microorganisms belonging to the microbial collection of Microbiology and Immunology Laboratory, Dental Scho
Publicado em: 1998
-
15. Characterization of metal-binding bioflocculants produced by the cyanobacterial component of mixed microbial mats.
Mixed-species microbial mats that were dominated by the cyanobacterium Oscillatoria sp. and contained heterotrophic and purple autotrophic bacteria were constructed for specific bioremediation applications. When the mats were challenged with metals, production and secretion of metal-binding extracellular polysaccharide bioflocculants were observed. The conce
-
16. Structural and antigenic types of cell wall polysaccharides from viridans group streptococci with receptors for oral actinomyces and streptococcal lectins.
Lectin-mediated interactions between oral viridans group streptococci and actinomyces may play an important role in microbial colonization of the tooth surface. The presence of two host-like motifs, either GalNAc beta1-->3Gal (Gn) or Gal beta1-->3GalNAc (G), in the cell wall polysaccharides of five streptococcal strains accounts for the lactose-sensitive coa
-
17. Sulfated Polysaccharide-Directed Recruitment of Mammalian Host Proteins: a Novel Strategy in Microbial Pathogenesis
Fundamental to the virulence of microbial pathogens is their capacity for adaptation and survival within variable, and often hostile, environments encountered in the host. We describe a novel, extragenomic mechanism of surface modulation which may amplify the adaptive and pathogenic potential of numerous bacterial species, including Staphylococcus, Yersinia,
American Society for Microbiology.
-
18. Bacteriocin Production and Susceptibility Among Strains of Streptococcus mutans Grown in the Presence of Sucrose
Whereas the bacteriocin activity of eight strains of Streptococcus mutans was unaffected by growth in the presence of sucrose, such a medium rendered five S. mutans and one S. salivarius indicator strains unsusceptible to the bacteriocins. In contrast, the susceptibility of three S. faecalis and one S. pyogenes strains was unaltered when these indicators wer
-
19. Soluble beta-glucan polysaccharide binding to the lectin site of neutrophil or natural killer cell complement receptor type 3 (CD11b/CD18) generates a primed state of the receptor capable of mediating cytotoxicity of iC3b-opsonized target cells.
When phagocyte CR3 binds to iC3b on bacteria or yeast, phagocytosis and degranulation are triggered because of simultaneous recognition of iC3b via a CD11b I-domain binding site and specific microbial polysaccharides via a lectin site located COOH-terminal to the I-domain. By contrast, when phagocyte or natural killer (NK) cell CR3 adheres to iC3b on erythro
-
20. Increased Levels of Markers of Microbial Exposure in Homes with Indoor Storage of Organic Household Waste
As part of environmental management policies in Europe, separate collection of organic household waste and nonorganic household waste has become increasingly common. As waste is often stored indoors, this policy might increase microbial exposure in the home environment. In this study we evaluated the association between indoor storage of organic waste and le
American Society for Microbiology.
-
21. Susceptibility and Resistance of Several Fungi to Microbial Lysis1
Potgieter, H. J. (Cornell University, Ithaca, N.Y.), and M. Alexander. Susceptibility and resistance of several fungi to microbial lysis. J. Bacteriol. 91:1526–1532. 1966.—Strains of Streptomyces, Nocardia, and Pseudomonas capable of lysing hyphae of Fusarium solani or Neurospora crassa were obtained by selective culture, but attempts to isolate an organ
-
22. Specific binding of a fungal glucan phytoalexin elicitor to membrane fractions from soybean Glycine max
Treatment of soybean tissues with elicitors results in the production of phytoalexins, one of a number of inducible plant defense reactions against microbial infections. The present study uses a β-1,3-[3H]glucan elicitor fraction from Phytophthora megasperma f. sp. glycinea, a fungal pathogen of soybean, to identify putative elicitor targets in soybean tiss
-
23. Promiscuity in ligand-binding: The three-dimensional structure of a Piromyces carbohydrate-binding module, CBM29-2, in complex with cello- and mannohexaose
Carbohydrate–protein recognition is central to many biological processes. Enzymes that act on polysaccharide substrates frequently contain noncatalytic domains, “carbohydrate-binding modules” (CBMs), that target the enzyme to the appropriate substrate. CBMs that recognize specific plant structural polysaccharides are often able to accommodate both the
National Academy of Sciences.
-
24. Biological impact on mineral dissolution: Application of the lichen model to understanding mineral weathering in the rhizosphere
Microorganisms modify rates and mechanisms of chemical and physical weathering and clay growth, thus playing fundamental roles in soil and sediment formation. Because processes in soils are inherently complex and difficult to study, we employ a model based on the lichen–mineral system to identify the fundamental interactions. Fixed carbon released by
The National Academy of Sciences.