methanogenesis

Examples of methanogenesis in the following topics:

• Syntrophy and Methanogenesis

  • Methanogenesis in microbes is a form of anaerobic respiration, performed by bacteria in the domain Archaea.
  • In methanogenesis, carbon is used as the terminal electron receptor instead of oxygen.
  • These products cannot be used in methanogenesis.
  • By oxydizing them to acetate, they allow them to be used in methanogenesis.
  • The protozoans break down cellulose, releasing H2 which is then used in methanogenesis.

• Methanogenesis

  • The biochemistry of methanogenesis is relatively complex.
  • Methanogenesis also occurs in the guts of humans and other animals, especially ruminants.
  • The useful products of methanogenesis are absorbed by the gut.
  • Methanogenesis can also be beneficially exploited.
  • Acetate is broken down to methane by methanogenesis, a type of anaerobic respiration.

• Clostridial and Propionic Acid Fermentation

  • Acidogenesis is the second stage in the four stages of anaerobic digestion: hydrolysis, acidogenesis, acetogenesis, and methanogenesis.
  • Finally, methanogenesis is a biological reaction wherein acetates are converted into methane and carbon dioxide, and hydrogen is consumed.

• Archaeoglobus

  • The complete genome sequence from Archaeoglobus fulgidus reveals the presence of a complete set of genes for methanogenesis.
  • The function of these genes in A. fulgidus remains unknown, and the lack of the enzyme methyl-CoM reductase does not allow for methanogenesis to occur by a mechanism similar to that found in other methanogens.

• Control of Transcription in Archaea

  • Of the remainder of the unique proteins that have an identified function, most belong to the Euryarchaea and are involved in methanogenesis.

• Diverse Cell Forms of Methanogens

  • Only M. acetivorans and microbes in the genus Methanosarcina use all three known metabolic pathways for methanogenesis.

• Cooperation Among Microorganisms

  • The protozoans break down cellulose, releasing H2 which is then used in methanogenesis.

• Syntrophy

  • Finally, anaerobic fermentation/methanogenesis is an example of a syntrophic relationship between different groups of microorganisms.
  • Conversely, the available free energy from methanogenesis is lowered from ΔGº= -131 kJ/mol under standard conditions to ΔG' = -17 kJ/mol at 10−5 atm hydrogen.

• Archaeal Gene Regulation

  • Of the remainder of the unique proteins that have an identified function, most belong to the Euryarchaea and are involved in methanogenesis.

• Energy Conservation and Autotrophy in Archaea

  • Methanogenesis uses a range of coenzymes that are unique to these archaea, such as coenzyme M and methanofuran.