Bacteria methane producers

Methane production [CO2 + H2 (or simple organic compound such as acetate) - CH4 + H2O] Methane-producing bacteria... 

The methane-producing bacteria that derive their energy from the oxidation of simple organic compounds such as methanol and acetate, release large quantities of methane. They... 

Methanogenic bacteria (archaea) Produce methane as an energy source (or utilise it as a carbon source later)... 

Reactive Orange 96 Anaerobic culture of sulfate-reducing bacteria, methanogens, and fermentative bacteria Sulfate-reducing bacteria removed 95% of the dye in 40 h. Methane producing bacteria did not contribute in dye removal. Fermentative bacteria could remove only 30% of the dye in 90 h [186]... 

The same types of anaerobic bacteria that produced natural gas also produce methane today. Anaerobic bacteria are some of the oldest forms of life on earth. They evolved before the photosynthesis of green plants released large qnantities of oxygen into the atmosphere. Anaerobic bacteria break down or digest organic material in the absence of oxygen and produce biogas as a waste product. 

Seeding. This is a component of the start-up practice and consists of the addition of actively digesting material to a newly operating digester. The addition ensures that a culture of methane-producing bacteria is present for start-up. 

This strain uses the carbon-chlorine bond as an electron acceptor and molecular hydrogen as its source of electrons. A number of other anaerobic microorganisms, particularly methane-producing bacteria, also use hydrogen as an electron source, but this bacterium uses it at a lower concentration than most of its competitors. 

Methanogenic bacteria that produce methane and carbon dioxide... 

One conclusion from these comparisons is that the methane-producing bacteria, the methanogens,24 are only distantly related to most other bacteria. Methano-... 

Much interest has also been expressed in tetra-azamacrocyclic compounds, due to their role in the natural reduction of C02 to CH4 by a nickel tetrapyrrole coenzyme found in methane-producing bacteria. Tinnemans et al. used Co(II) tetra-azamacrocyclic complexes with [Ru(bpy)3]2+ as the photosensitizer and ascorbic acid as the sacrificial electron donor in aqueous C02-saturated solutions at acidic pH [33]. Whilst the TON for the total observed products of CO and H2 exceeded 500, they were formed in a ratio of 0.27 1, respectively. 

Methanopterin (20) is a folate analogue that is isolated from an archae-bacteria, Methanosarcina thermophila, and the bacteria produces methane from CO2 under anaerobic conditions [18-24]. In the methane-producing metabolic process (Scheme 2), tetrahydromethanopterin (21) is known to work as a cofactor for the reduction of the Ci unit. Here, 21 accepts a formyl group that originates from CO2 and transforms it into the formyl... 

Gunnarsson, L.A.H., and Ronnow, P.H. (1982) Inter-relationships between sulfate reducing and methane producing bacteria in coastal sediments with intense sulfide production. Mar. Biol. 69, 121-128. 

Different groups of microorganisms participate in this anaerobic conversion. First, extracellular enzymes of hydrolytic bacteria liquefy the polymenic and insoluble substances. The produced monomers are then further degraded by acid-producing bacteria to acetic acid, H2, C02 etc. These metabolites are the substrate for methane-producing bacteria. The end product, a gas mixture of 70 % methane and... 

H.A. Barker, S. Ruben and M.D. Kamen, The Reduction of Radioactive Carbon Dioxide by Methane-Producing Bacteria, Proceedings (f the National Academy of Scierwes... 

Belyayev S. S., Lein A. Y., and Ivanov M. V. (1981) Roles of methane-producing and sulfate-reducing bacteria in... 

The fermentation of carbohydrates and protein are each no doubt mediated by more than one species of bacteria, and so the assumption that this occurs in a single step is a significant simplification. However, the fermentation of hydrogen and the various fatty acids by independent species of methane producing bacteria appears to be quite realistic. 

---