Biodegradation of individual and multiple chlorinated aliphatic hydrocarbons by methane-oxidizing cultures

Article Abstract:

Four methane-oxidizing cultures of 2 pure microbial strains fail to degrade fully chlorinated aliphatic hydrocarbons, such as perchlorothylene and carbon tetrachloride. The product toxicity of the hydrocarbons are cumulative and predictable when parameters related to the degradation of the individual compounds are used. The transformation capacity (T{sub C}) for each hydrocarbon and the total T(sub C) depend upon the individual T(sub C), the initial substrate concentration, and the first-order rate constant of each compound.

Analysis, Physiological aspects, Biodegradation, Oxidation, Physiological, Physiological oxidation, Aliphatic compounds, Hydrocarbons

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Evaluation of toxic effects of aeration and trichloroethylene oxidation on methanotrophic bacteria grown with different nitrogen sources

Article Abstract:

Research was conducted to examine the specific and nonspecific toxic effects of aeration and trichloroethylene (TCE) oxidation on methanotrophic bacteria grown with several nitrogen sources, namely, ammonia, nitrate and molecular nitrogen. Transformations in methane uptake rates and naphthalene oxidation rates following aeration and/or TCE oxidation were compared. Results indicate that aeration and TCE oxidation exert both specific and nonspecific toxic effects on soluble methane monooxygenase.

Nitrogen, Nitrogen fixation

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Effect of nitrogen source on growth and trichloroethylene degradation by methane-oxidizing bacteria

Article Abstract:

Research was conducted to assess nitrogen source effects on methane-oxidizing bacteria by utilizing one mixed chemostat culture and two pure strains. Effects were evaluated in relation to specific methane uptake rates, specific naphthalene oxidation rates, cellular growth and trichloroethylene (TCE) degradation ability. Results suggest the feasibility of enriching nitrogen-fixing methane oxidizers for the improvement of bioremediation in fixed-nitrogen-limited environments.

Usage, Bacterial growth, Bioremediation, Nitrogen-fixing microorganisms

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