Article Abstract:
The impact of a number of amendments on the consumption of {U-14C dimethyl sulfide in a Georgia salt marsh revealed that methylated compounds, especially dimethyl groups inhibited dimethyl sulfide consumption whereas nonmethylated substrates did not have much effect. Dimethylsulfide and dimethyl ether were among the most effective inhibitors examined. Biogenic dimethylsulfide (DMS) is an important source of sulfur to the marine troposphere and is a significant climatic role through the formation of marine tropospheric aerosol and cloud condensation nuclei (3).
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Article Abstract:
Natural estuarine bacteria can rapidly scavenge choline at the low concentrations expected to be found in estuarine and coastal waters. This was gleaned from a study of the uptake and degradation of nanomolar levels of (methyl-(super 14)C)choline in estuarine water samples and in seawater filtrate cultures. Uptake of choline exhibited Michaelis-Menten-type saturation kinetics, characteristic of enzyme-mediated transport. Some natural structural analogs and p-chloromercuribenzoate were also found to inhibit the uptake of choline.
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Article Abstract:
The formation of dimethyl sulfide (DMS) in anoxic slurries of Sphagnum peat is due to the methylation of endogenous methanethiol (MeSH). The solid-phase adsorption of MeSH leads to the supply for the biomethylation reactions. At an average rate of 40.4 nmol per liter of slurry per day the DMS is obtained with a linear time course, and it causes considerable fluxes of DMS emission to the atmosphere from Sphagnum species prevalent wetlands.
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