Microbial methanogenesis is a major source of the greenhouse gas methane (CH 4). It is the
final step in the anaerobic degradation of organic matter when inorganic electron acceptors …

Vegetated coastal ecosystems (VCEs; ie, mangroves, salt marshes, and seagrasses) play a
critical role in global carbon (C) cycling, storing 10× more C than temperate forests. Methane …

Over the past century a number of models have been developed to explain the vast
stratigraphic distribution of authigenic dolomite. These models include hydrogeological …

Methane is the most abundant organic chemical in Earth's atmosphere, and its concentration
is increasing with time, as a variety of independent measurements have shown …

The role of anaerobic oxidation of methane (AOM) in wetlands, the largest natural source of
atmospheric methane, is poorly constrained. Here we report rates of microbially mediated …

Biological methanogenesis plays a major role in the carbon cycle on Earth. Methanogenesis
is the terminal step in carbon flow in many anaerobic habitats, including marine and …

▪ Abstract Vitamin B12 is a complex organometallic cofactor associated with three
subfamilies of enzymes: the adenosylcobalamin-dependent isomerases, the …

Life evolved and flourished in the absence of molecular oxygen (02). As the 02 content of
the atmosphere rose to the present level of 21% beginning about two billion years ago …

1. The concentration of sulphate is low in lakes and sulphur cycling has often been
neglected in studies of organic matter diagenesis in lake sediments. The cycling of sulphur …

Mechanisms for inhibition of sulfate reduction and methane production in the zone of Fe (III)
reduction in sediments were investigated. Addition of amorphic iron (III) oxyhydroxide to …