A method for calculating bacterial deposition coefficients using the fraction of bacteria recovered from laboratory columns

Article Abstract:

An analytical solution to a nondimensional transport equation involving bacterial depositor was used to find out if a practical relationship exists between the deposition coefficient and the easily identified fractional recovery of bacteria. Bacterial deposition coefficients from column experiments were gathered by solely measuring the total affluent and effluent number of bacteria. The fraction of bacteria recovered and the dimensionless deposition coefficient were observed to have a nonlinear relationship, which was adequately reflected by experimental data. Overall, the simple fractional recovery of bacteria may be used to secure an exact value for the dimensionless deposition coefficient.

Waste Management and Remediation Services, Water Pollution, Biological transport

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Method for in situ study of bacterial activity in aquifers

Article Abstract:

An in situ method based on the use of a multilayer sampler equipped with dialysis cells offers an effective approach to measure bacterial activity at the microscale level. Application of the approach to investigate atrazine degradation by Pseudomonas sp. strain ADP in contaminated groundwater showed that bacterial does not lose its degradation ability despite contact with contaminated groundwater. The method is highly recommended for the analysis of other bacterial strains.

Aquifers

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Dissolution and reduction of magnetite by bacteria

Article Abstract:

Marine and freshwater strains of the bacterium Shewanella putrefaciens exhibited higher magnetite reduction rates when coupled to carbon metabolism than over no carbon controls. The bacteria reduced more than 10 times the amount of magnetite in media containing formate or lactate as electron donors, suggesting that magnetite reduction is coupled to electron transport. The samples also reduced magnetite, converting the iron oxide to soluble iron, in shorter time.

Oxidation, Physiological, Physiological oxidation, Marine sediments, Magnetite

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