Microbial mats and Earth's Early Biosphere - David Des Marais (SETI Talk...
Μετάδοση με ζωντανή ροή στις 17 Σεπ 2013
SETI Talks archive: http://seti.org/talks
Photosynthetic
microbial mats are complete microbial ecosystems that can construct
laminated "miniature reefs" called stromatolites. Their fossilized
equivalents are among the oldest most abundant evidence of early life.
Dr. Des Marais and his colleagues have studied cyanobacterial mats in an
arid coastal environment at the Exportadora de Sal, S.A. (ESSA) salt
works, Guerrero Negro, Baja California Sur, Mexico. He will show how the
mats' oxygenated zone reflects a dynamic balance between vigorous
photosynthetic O2 production and O2 consumption by diverse
sulfide-oxidizing and heterotrophic bacteria.
Anoxygenic
phototrophs and sulfate-reducing bacteria are quantitatively important
consumers of dissolved organic matter. He will show how several
previously unknown rRNS gene sequences of bacteria and eukarya were
identified, indicating that these mats can extend our understanding of
the diversity and early evolution of benthic microbial communities. He
continues to catalog the diversity of lipid biosignatures, whose fossil
equivalents can record the diversity of ancient microbial ecosystems.
Photosynthetic
microbial mats are complete microbial ecosystems that can construct
laminated "miniature reefs" called stromatolites. Their fossilized
equivalents are among the oldest most abundant evidence of early life.
Dr. Des Marais and his colleagues have studied cyanobacterial mats in an
arid coastal environment at the Exportadora de Sal, S.A. (ESSA) salt
works, Guerrero Negro, Baja California Sur, Mexico. He will show how the
mats' oxygenated zone reflects a dynamic balance between vigorous
photosynthetic O2 production and O2 consumption by diverse
sulfide-oxidizing and heterotrophic bacteria.
Anoxygenic
phototrophs and sulfate-reducing bacteria are quantitatively important
consumers of dissolved organic matter. He will show how several
previously unknown rRNS gene sequences of bacteria and eukarya were
identified, indicating that these mats can extend our understanding of
the diversity and early evolution of benthic microbial communities. He
continues to catalog the diversity of lipid biosignatures, whose fossil
equivalents can record the diversity of ancient microbial ecosystems.
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