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Content with the tag: “microbial life”
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Astrobiologists Find Evidence of Early Life on Land
Scientists with NASA’s Astrobiology Institute have discovered evidence that microbial life emerged on land between 2.6 billion and 2.7 billion years ago, much earlier than previously thought.
January 17, 2001 / Posted by: Shige Abe
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structure biogenic molecules biogeochemical cycles biogeochemistry biogeography biological biomarker biomarkers biome biomimetic synthesis biopan biosignature biosignatures biosphere biosphere-atmosphere interactions biosustaining energy bodonids boethin books borehole brine britian brown dwarfs burgess shale-type ca calcite calcite nano-fibers calcium cambrian canada canyon canyons carbon carbon-13 carbonaceous chondrite carbonate carbonate rocks carbonates carbon chemistry carbon cycle carbon dioxide carbon dioxide ice cargill salt company cassini catalysis catalytic cavity ring-down spectrometer cdna celestial mechanics celestial mechanics – methods: n-body simulations – planets and satellites: general – solar system: celestial mechanics. cells chelation chemical weathering chemin (chemical and mineralogical xrd/xrf instrument) chemoautotrophy chemolithoautotrophs chemostratigraphy chemosynthetic communities chemotrophs chile chimpanzee china chip chiral chirality chlamydomonad 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fractionation el ni�o embedded star formation enceladus encyclopedia of life endosymbiosis endourance endurance england environment environmental chemistry environments enzyme enzymes eoarchean epimerases epoxi erosion esa ethane eubacteria eukaryote eukaryote evolution eukaryotes eukaryotic-specific primers eukaryotic microbial community europa evaporation evaporite evolution evolution and environment exo-planetary systems exobiology exoplanet exoplanets exosolar planets expose express exremophiles extra-solar planets extrasolar life extrasolar planet extrasolar planets extraterrestrial extraterrestrial life extreme conditions extreme environment extreme environments extreme life extremeophiles extremephiles extremophiles faint companion farmer fe fe isotopes femtochemistry fiction fieldwork in april of 1999 in the tinto river located in the huelva district of southwestern spain fingerprint fischer-tropsch catalysis flood fluorescence in situ hybridization focus group formation routes 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interstellar medium interstellar molecules interviews in vitro evolution ionizing radiation ion microprobe iron iron –sulfides iron-sulfur enzymes iron-sulfur minerals iron concentrations iron formation iron isotope fractionation iron oxide iron oxidizers iron oxidizing bacteria iron reducers iron reduction kinetics irons-sulfur surfaces iron spectromicroscopy irradation irradiation ir spectroscopy isomerases isotope isotopes isotopic fractionation iss issol jack hills jakoba incarcerata jakoba libera jakobids jarosite journal:earth journal: journal of geophysical research journal of bacteriology journal of the american chemical society jpl jupiter kbo kbo size distribution kepler key nutrient metals kuiper belt kuiper belt objects laboratory laboratory investigation laboratory science lake lake bonney lakes landsat tm data laser laser desorption lassen lassen volcanic national park late accretion late bombardment late heavy bombardment ldn 673 left-handed lefty level of analysis lexen 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water martian analogues martian atmosphere martian channels martian dynamo martian meteorites martian oceans mass extinction mass extinctions mbcs mcmurdo dry valleys m dwarfs m dwarf stars media membranes mer mercury messenger metabolic chemistry metabolism first metagenome metagenomics metal isotope fractionation metal sulfides metamorphism meteor meteorite meteorites meteoritic organics meteors meterite meterorites methane methane cycle methanococcus methanogen methanogenesis methanogens methanopyrus methodology mexico micro-oxic environment microbes microbial microbial communities microbial community microbial community population structures microbial diversity microbial ecology microbial ecosystem microbial ecosystems microbial evolution microbial evolutionary processes. microbial geochemistry microbialite microbialites microbial life microbial mat microbial mats microbiology microgravity microlensing microorganisms microscopy mike russell miller-urey miller-urey experiments 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protocellular catalysts protoplanetary disk ps1 psi_blast psychrotolerant public pyrite pyrosequencing pyroxenes and olivine. pyruvic acid quantifying quantum quantum mechanics quartet radiation radiation chemistry radiative-transfer models radiative transfer radiative transfer model radio radioactivity radiolysis radio new york raman microscope raman spectroscopy raman spectroscopy` rdna reclinomonas americana redox redox-sensitive metals redox evolution redox processes reduction remote-sensing remote-sensing techniques remote sensing remote sensing database reptiles ribosomal gene ribosomal rna ribosomal rna phylogeny rio tinto rise of oxygen rna rna display rna world robatic robot robotic robotics robots rover rovers rrna saline salt sam (sample analysis at mars) samples satellites saturn scanning electron microscopy science (journal) scientific american (journal) seafloor weathering search for life sea surface temperature seawater second genesis second life sediment sediment-buried 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