Responses of methanotrophic activity in soils and cultures to water stress

Article Abstract:

The rate of utilization of atmospheric methane by methanotrophic soils decreases with a decrease in the soil water content and water potential. Water stress in soils with low water content and gas transport in soils with high water content decrease methanotrophic activity. The highest rate of methane utilization occurs in soils with 25% water content and -0.2 MPa water potential. The addition of ionic or nonionic solutes to the soils decreases methane uptake more than the addition of sodium or potassium chloride.

Analysis, Environmental aspects, Observations, Microbial metabolism, Soil microbiology, Water

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Effects of ammonium and non-ammonium salt additions on methane oxidation by Methylosinus trichosporium OB3b and Maine forest soils

Article Abstract:

A study was conducted to assess the influence of ammonium and non-ammonium salts on methane oxidation by Methylosinus trichosporium. Culture responses were assayed at low headspace methane concentrations and low to modest salt concentrations. Results indicated that inhibition of methane consumption by non-ammonium salts is attributable to ion-exchange reactions. Also, the disparity in the extent of inhibition among ammonium salts is due partly to the effects of anions on ammonium exchange.

Oxidation, Physiological, Physiological oxidation, Ammonium, Oxidizing agents

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Methanol promotes atmospheric methane oxidation by methanotrophic cultures and soils

Article Abstract:

Methanol or other nonmethane substrates may promote atmospheric methane oxidation in situ. This was concluded after two methanotrophic bacteria, Methylobacter albus BG8 and Methylosinus trichosporium OB3b, oxidized methane during batch growth on methanol. While methane consumption was rapidly and significantly decreased when washed cell suspensions were incubated without methanol in the presence of atmospheric methane, methanotrophic activity was stimulated after methanol addition.

Oxidation-reduction reaction, Oxidation-reduction reactions, Methanol

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