Methanogenic species

Example 15 in connection with studies on thermal stability of proteins and nucleic acids of the methanogen species the cyclodiphospho-D-glycerate (CDPG) has been synthesized by Priestley from n-butyl-D-glycerate employing dibenzyl diisopropylphosphoroamidite (BnO)2PNiPr2 reagent [43]. 

Fynn, G.H. and Whitmore, T.N., Colonization of polyurethane reticulated foam biomass support particle by methanogen species, Biotechnol. Lett. 1982. vol. 4, no. 9, pp. 577-582. 

Nemati investigated the inhibiting effect of ferrous iron on the rate of oxidation in a bioreactor packed with a polyurethane foam. Fynn and Whitmore investigated the ability of methanogen species to colonize reticulated polyurethane foam in a continuous culture system. Electron micrographs confirmed that two methanogen species colonized the matrix. The methane output was superior to a liquid culture control. 

Almost all methanogen species can grow on H2+CO2 carrying out autotrophic cell carbon biosynthesis [183]. Due to simplicity of the catabolites, C02-reduction to methane has been extensively used as a model system to study the biochemistry of methanogenesis. Most of this work has used M. thermoautotrophicum, and to a lesser extent, M. barkeri. 

Several methanogenic species have been described that use ethanol, propanol and 2-propanol, 2-butanol and cyclopentanol as electron donors for CO2 reduction to... 

About 26% of methanogenic species can use methylated substrates other than acetate, such as methanol, methylated amines, and methylated sulfur compounds (Hippe et al., 1979 Kiene, 1991b). Because the process does not require an external electron acceptor, methylotrophy is a type of fermentation. The contribution of these organisms to CH4 production in natural ecosystems appears to be minor, but they may contribute substantially to the metabolism of methylated sulfur compounds. Scholten et al. (2003) provided thermodynamic constraints on the feasibility of such reactions. 

In a survey of five methanogenic species drawn from a wide range of phylogenetic and physiological types, all the hydrogenotrophs... 

Volatile Acids Kinetics. In evaluating the methane fermentation kinetics of the three volatile acids chosen for study, it was necessary to consider the process biochemistry and stoichiometry. According to Barker (19), acetic acid is fermented to methane and carbon dioxide in a single step while both propionic and butyric acids are fermented in two steps. In the first step these acids are fermented to acetic acid and methane by species of methanogenic bacteria. The resulting acetic acid is then fermented by different methanogenic species to methane and carbon dioxide. The stoichiometry of these fermentations is shown by the following equations (19). 

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