Bacteria adsorption

Molecular simulation methods can be a complement to surface complexation modeling on metal-bacteria adsorption reactions, which provides a more detailed and atomistic information of how metal cations interact with specific functional groups within bacterial cell wall. Johnson et al., (2006) applied molecular dynamics (MD) simulations to analyze equilibrium structures, coordination bond distances of metal-ligand complexes. 

Fowle DA, Fein JB (2000) Experimental measurements of the reversibility of metal-bacteria adsorption reactions. Chem Geol 168 27-36... 

A further advantage of an SCM approach is that thermodynamic parameters for adsorption reactions can be compared with the thermodynamic properties of other types of reactions, to assess correlative relations that may be used to predict the behaviour of chemical species for which experimental data are currently lacking. In Fein et al. (1997) the authors compared model results for equilibrium constants of metal-bacteria adsorption reactions, and found a strong correlative relationship between these values and corresponding equilibrium constants for metal-oxalate and metal-tiron (4,5-dihydroxy-m-benzenedisulphonic acid) aqueous... 

A bacterial suspension can be interpreted as a living colloidal system, and the initial step of adhesion involves, at a first approximation, an adsorption phenomenon that takes place between the organic macromolecules that constitute the bacteria outer shell and the carbon surface. Hence, bacteria adsorption can be explained by colloid and surface chemistry theories, which is why this section... 

Carbon SN, l macropores (cm /g) Oxygen (%) Ash (%) PUpzC Pffpzc (carbon-bacteria) Adsorption (%)... 

Alkanes collected over a 12 months period, offshore from Louisiana and Florida, were characterised by Ledet and Laseter (1974) unexpectedly, methyl branched alkanes ranging in chain length from C15 to C3S and cycloalkanes were frequently the dominant components. Possible explanations for this enrichment may be selective removal by autoxidation, preferential oxidation of n-alkanes by bacteria, adsorption onto particles, a contribution from some crude oils particularly rich in methylalkanes or a contribution from certain plants containing large quantities of 3-methyl branched alkanes (Weete et ed., 1971). 

Bisphenol-A, nonylphenol, estradiol, diethylstilbestrol, tributyltin Conductometry, potentiometry Sulfur-oxidizing bacteria Adsorption 5-200 ppb n.r. 143... 

Cr + Conductivity, potentiometry Sulfur-oxidizing bacteria Adsorption n.r. n.r. 145... 

The inhibition of Streptococcus mutans adherence to hydroxyapatite with combinations of alkyl phosphates and nonionic surfactants was tested. Seven alkyl phosphate derivatives and three nonionic surfactants were examined for their ability to inhibit the adherence of 3H-labeled cells of S. mutans to hydroxyapatite treated with buffer or parotid saliva. No compound by itself effectively hindered binding of bacteria to hydroxyapatite. A combination of certain of the alkyl phosphates, notably a disodium phosphate of 1-octadecanol, and nonionic surfactant at a 1 1 molar ratio gave a strong inhibition of S. mutans adherence. Treatment with this combination resulted in 98% reduction of adherence. Adsorption of the two types of surface-active agents alone and in combinations was studied using 14C-labeled agents. Electrophoretic measure-... 

Bacteria have been Implicated in the formation of N-nitroso compounds under a wide variety of conditions representing both vitro and vivo situations Mechanisms of participation and/or catalysis Include a) decrease of the pH of the system, b) reduction of nitrate to nitrite, c) adsorption of amine onto the cell surface or cytoplasmic membrane, d) actual enzymatic formation. The literature of the field will be reviewed and experimental evidence which tests the above mechanisms will be presented ... 

Marches JR, NJ Russel, GF White, WA House (1991) Effects of surfactant adsorption and biodegradability on the distribution of bacteria between sediments and water in a freshwater microcosm. Appl Environ Microbiol 57 2507-2513. 

A mathematical model for reservoir souring caused by the growth of sulfate-reducing bacteria is available. The model is a one-dimensional numerical transport model based on conservation equations and includes bacterial growth rates and the effect of nutrients, water mixing, transport, and adsorption of H2S in the reservoir formation. The adsorption of H2S by the roek was considered. 

Mahon (1982) measured BCFs of 1,576 and 459 in algae and plankton, respectively. Horikoshi et al. (1981) determined BCFs in several species of bacteria that ranged from 2,794 to 354,000. However, bioconcentration by the bacteria represented adsorption onto the cell surfaces of the bacteria rather than true biological uptake. 

Pure Ti02 was recently reported to be active in the disinfection of water contaminated by spores of the type Fusarium solani [142], Bacillus anthracis [143], or Cryptosporidium parvum oocysts [144], or when supported as nanocomposites on zeolite H(i for E. coli deactivation [145], and it found applications in water treatment as a replacement for chlorine. Ag-Ti02 immobilized systems were used for inactivation of bacteria, coupling the visible light response of the system and the strong bactericidal effect of Ag [146]. Silver was deposited on hydroxyapatite to form nanocomposites with a high capacity for bacterial adsorption and inactivation [147], or used for airborne bacterial remediation in indoor air [148],... 

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