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Extracellular polymeric substances responsible for bacterial adhesion onto solid surface (2003)

Tsuneda, Satoshi ; Aikawa, Hirotoshi ; Hayashi, Hiroshi ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

FEMS microbiology letters 223 (2003), S. 0

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ISSN: 1574-6968

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The influence of extracellular polymeric substances (EPS) on bacterial cell adhesion onto solid surfaces was investigated using 27 heterotrophic bacterial strains isolated from a wastewater treatment reactor. Cell adhesion onto glass beads was carried out by the packed-bed method and the results were discussed in terms of the amount of each EPS component produced and cell surface characteristics such as zeta potential and hydrophobicity. Protein and polysaccharides accounted for 75–89% of the EPS composition, indicating that they are the major EPS components. Among the polysaccharides, the amounts of hexose, hexosamine and ketose were relatively high in EPS-rich strains. For EPS-poor strains, the efficiency of cell adhesion onto glass beads increased as the absolute values of zeta potential decreased, suggesting that electrostatic interaction suppresses cell adhesion efficiency. On the other hand, the amounts of hexose and pentose exhibited good correlations with cell adhesiveness for EPS-rich strains, indicating that polymeric interaction due to the EPS covering on the cell surface promoted cell adhesion. It was concluded that, if the EPS amount is relatively small, cell adhesion onto solid surfaces is inhibited by electrostatic interaction, and if it is relatively large, cell adhesion is enhanced by polymeric interaction.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1016/S0378-1097(03)00399-9

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Analysis of shear layers based on the lattice gas model (1995)

Yuasa, Atsushi ; Inamuro, Takaji ; Adachi, Takeshi

Chichester : Wiley-Blackwell

International Journal for Numerical Methods in Fluids 21 (1995), S. 967-972

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ISSN: 0271-2091

Keywords: lattice gas model ; cellular automaton ; shear layer ; diffusion ; Kelvin-Helmholtz instability ; Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: The ‘two-colour lattice gas model’ is applied to the analysis of shear layers between two parallel flows with different velocities U1 and U2. Two cases, (a) U1 = 0.4, U2 = 0.2 and (b) U1 = 0.4, U2 = 0.0, are calculated and compared with the theoretical solutions. We obtain good agreement between theory and calculations in the velocity profiles of the shear layers. It is found that this model can simulate complicated physical phenomena of shear layers at the microscopic level.

Additional Material: 5 Ill.