Fibronectin Binding and Cell Surface Hydrophobicity Contribute to Adherence Properties of Group B Streptococci

1996 ◽  
Vol 285 (1) ◽  
pp. 35-43 ◽  
Author(s):  
Lutz Thomas Zabel ◽  
Andreas Neuer ◽  
Birgit Manncke
Keyword(s):  
Cell Surface ◽  
Cell Surface Hydrophobicity ◽  
Surface Hydrophobicity ◽  
Group B Streptococci ◽  
Fibronectin Binding ◽  
Group B

scholarly journals Sialic acid content and surface hydrophobicity of group B streptococci

1993 ◽  
Vol 110 (1) ◽  
pp. 87-94 ◽  
Author(s):  
L. A. Teixeira ◽  
A. M. S. Figueiredo ◽  
B. T. Ferreira ◽  
V. M. L. Alves ◽  
P. E. Nagao ◽  
...  
Keyword(s):  
Sialic Acid ◽  
Cell Surface ◽  
Acid Content ◽  
Cell Surface Hydrophobicity ◽  
Surface Hydrophobicity ◽  
Gas Liquid Chromatography ◽  
Group B Streptococci ◽  
Sialic Acid Content ◽  
Asymptomatic Patients ◽  
Group B

SUMMARYThe sialic acid content and the cell-surface hydrophobicity index of 40 group B streptococci (GBS) strains were assessed. GBS isolated from invasive infections (virulent strains) presented an increased level of sialic acid content (1.4%) when compared with GBS isolated from asymptomatic patients (0.53%). Treatment of GBS strain 85634 with neuraminidase resulted in a decrease (about 25%) in the net negative surface charge as assessed by cell electrophoresis. This finding suggests that sialic acid residues are important anionogenic groups exposed on GBS cell surface.N-acetylneuraminic acid was the only sialic acid derivative characterized in the strain 85634 as evaluated by gas-liquid chromatography. GBS from different serotypes presented a hydrophobic index mean value of 0.9. Even though the sialic acid contributed effectively to the negative charge on GBS cell surface, no difference was observed in the hydrophobic index when virulent and avirulent strains were compared.

scholarly journals Cell surface hydrophobicity and adherence of a strain of group B streptococci during the post-antibiotic effect of penicillin

2008 ◽  
Vol 50 (4) ◽  
pp. 203-207 ◽  
Author(s):  
Ângela Maria Mendes Araújo ◽  
Ivi Cristina Menezes de Oliveira ◽  
Marcos Corrêa de Mattos ◽  
Leslie C. Benchetrit
Keyword(s):  
Cell Surface ◽  
Cell Surface Hydrophobicity ◽  
Surface Hydrophobicity ◽  
Bacterial Adherence ◽  
Group B Streptococci ◽  
Bacterial Physiology ◽  
Antibiotic Effect ◽  
Buccal Epithelial Cells ◽  
Group B

The minimum inhibitory concentration and post-antibiotic effects of an antimicrobial agent are parameters to be taken into consideration when determining its dosage schedules. The in vitro post-antibiotic effects on cell surface hydrophobicity and bacterial adherence were examined in one strain of group B streptococci. Exposure of the microorganism for 2 h at 37 °C to 1 x MIC of penicillin induced a PAE of 1.1 h. The cell surface charge of the Streptococcus was altered significantly during the post-antibiotic phase as shown by its ability to bind to xylene: hydrophobicity was decreased. Bacterial adherence to human buccal epithelial cells was also reduced. The results of the present investigation indicate that studies designed to determine therapeutic regimens should evaluate the clinical significance of aspects of bacterial physiology during the post-antibiotic period.

Autecology of scum producing bacteria

1998 ◽  
Vol 37 (4-5) ◽  
pp. 527-530 ◽  
Author(s):  
Hilde Lemmer ◽  
George Lind ◽  
Margit Schade ◽  
Birgit Ziegelmayer
Keyword(s):  
Wastewater Treatment ◽  
Cell Surface ◽  
Wastewater Treatment Plants ◽  
Cell Surface Hydrophobicity ◽  
Surface Hydrophobicity ◽  
Residence Times ◽  
Loading Conditions ◽  
Emulsifying Activity ◽  
Substrate Preferences

Non-filamentous hydrophobic scum bacteria were isolated from scumming wastewater treatment plants (WWTP) by means of adhesion to hydrocarbons. They were characterized with respect to taxonomy, substrate preferences, cell surface hydrophobicity, and emulsification capability. Their role during flotation events is discussed. Rhodococci are selected by hydrolysable substrates and contribute to flotation both by cell surface hydrophobicity and emulsifying activity at long mean cell residence times (MCRT). Saprophytic Acinetobacter strains are able to promote flotation by hydrophobicity and producing emulsifying agents under conditions when hydrophobic substrates are predominant. Hydrogenophaga and Acidovorax species as well as members of the Cytophaga/Flavobacterium group are prone to proliferate under low loading conditions and contribute to flotation mainly by emulsification.

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