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Encyclopedia > Hydrogen cycle

For the nuclear fusion process producing helium from hydrogen see Proton-proton chain reaction Overveiw of the proton-proton chain. ...

Hydrogen is one of the constituents of water. It recycles as in other biogeochemical cycles. It is actively involved with the other cycles like the carbon cycle, nitrogen cycle and sulfur cycle as well. Image File history File links Information. ... General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... Impact from a water drop causes an upward rebound jet surrounded by circular capillary waves. ... In ecology, a biogeochemical cycle is a circuit where a nutrient moves back and forth between both biotic and abiotic components of ecosystems. ... The carbon cycle is the biogeochemical cycle by which carbon is exchanged between the biosphere, geosphere, hydrosphere,and atmosphere of the Earth (other astronomical objects may have similar carbon cycles, but nothing is yet known about them). ... Schematic representation of the flow of Nitrogen through the environment. ... Wikipedia does not have an article with this exact name. ...


Anaerobic fermentation of organic substances to carbon dioxide and methane is a collaborative effort involving many different biochemical reactions, processes and species of microorganisms. One of these many processes that occur is termed "interspecies hydrogen transfer". This process has been described as integral to the symbiosis between certain methane-producing bacteria (methanogens) and nonmethanogenic anaerobes. In this symbiosis, the nonmethanogenic anaerobes degrade the organic substance and produce -among other things- molecular hydrogen (H2). This hydrogen is then taken up by methanogens and converted to methane via methanogenesis. One important characteristic of interspecies hydrogen transfer is that the H2 concentration in the microbial environment is very low. Maintaining a low hydrogen concentration is important because the anaerobic fermentative process become increasingly thermodynamically unfavorable as the partial pressure of hydrogen increases. Look up Fermentation in Wiktionary, the free dictionary. ... Carbon dioxide is a chemical compound composed of one carbon and two oxygen atoms, and is in a gaseous state in the atmosphere of the Earth. ... Methane is a chemical compound with the molecular formula CH4. ... A microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye). ... Meat Ants harvest Leaf Hoppers for their honey dew. ... Methanogens are archaea that produce methane as a metabolic byproduct. ... Methanogenesis is the formation of methane by microbes. ...


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References

1. "Microbiology and Biochemistry of Strict Anaerobes Involved in Interspecies Hydrogen Transfer" by Jean-Pierre BĂ©laich; Mireille Bruschi; Jean-Louis Garcia; Federation of European Microbiological Societies. Published Nov 1990. ISBN 0306435179


2. [1] F.A.M. de Bok, C.M. Plugge, and A.J.M. Stams; "Interspecies eletron transfer in methanogenic proprionate degrading consortia". Water Research 38 (2004): 1368-1375


3. [2] A.J.M. Stams et al., "Exocellular electron transfer in anaerobic microbial communities", Environmental Microbiology, 8 (2006):371-382

Biogeochemical cycles
Carbon cycle - Hydrogen cycle - Nitrogen cycle
Oxygen cycle - Phosphorus cycle - Sulfur cycle - Water cycle
This ecology-related article is a stub. You can help Wikipedia by expanding it.

  Results from FactBites:
 
Hydrogen - Wikipedia, the free encyclopedia (2555 words)
Hydrogen (Latin: hydrogenium, from Greek: hydro: water, genes: forming) is a chemical element in the periodic table that has the symbol H and atomic number 1.
Deuterium, an isotope of hydrogen (hydrogen-2), is used in nuclear fission applications as a moderator to slow neutrons, and in nuclear fusion reactions.
Hydrogen can be prepared in several different ways: steam on heated carbon, hydrocarbon decomposition with heat, reaction of a strong base in an aqueous solution with aluminium, water electrolysis, or displacement from acids with certain metals.
  More results at FactBites »

 
 

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