Linked Life Data

11486082

Source:http://linkedlifedata.com/resource/pubmed/id/11486082

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5531
pubmed:dateCreated
2001-8-3
pubmed:abstractText
The low O2 content of the Archean atmosphere implies that methane should have been present at levels approximately 10(2) to 10(3) parts per million volume (ppmv) (compared with 1.7 ppmv today) given a plausible biogenic source. CH4 is favored as the greenhouse gas that countered the lower luminosity of the early Sun. But abundant CH4 implies that hydrogen escapes to space (upward arrow space) orders of magnitude faster than today. Such reductant loss oxidizes the Earth. Photosynthesis splits water into O2 and H, and methanogenesis transfers the H into CH4. Hydrogen escape after CH4 photolysis, therefore, causes a net gain of oxygen [CO2 + 2H2O --> CH4 + 2O2 --> CO2 + O2 + 4H(upward arrow space)]. Expected irreversible oxidation (approximately 10(12) to 10(13) moles oxygen per year) may help explain how Earth's surface environment became irreversibly oxidized.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0036-8075
pubmed:author
pubmed:issnType
Print
pubmed:day
3
pubmed:volume
293
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
839-43
pubmed:dateRevised
2007-3-19
pubmed:meshHeading
pubmed:year
2001
pubmed:articleTitle
Biogenic methane, hydrogen escape, and the irreversible oxidation of early Earth.
pubmed:affiliation
Mail Stop 245-3, Space Science Division, NASA Ames Research Center, Moffett Field, CA 94035, USA. catling@humbabe.arc.nasa.gov
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.