University of Washington Seminar Series: Dr. Sanjoy Som

Event Details

University of Washington Seminar Series: Dr. Sanjoy Som

Time: November 6, 2012 from 3pm to 4pm
Location: online
Website or Map: http://connect.arc.nasa.gov/u…
Event Type: online seminar
Organized By: University of Washington
Latest Activity: Nov 6, 2012

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Event Description

Tuesday, November 6th at 3:00 PM PDT

A coupled geochemical-bioenergetic model to constrain the potential for methanogenesis in serpentinizing systems.

Dr. Sanjoy Som

NASA Ames Research Center

The likely presence of liquid water in contact with olivine-bearing rocks on Mars, the detection of serpentine minerals and of methane emissions possibly consistent with serpentinization, and the observation of serpentine-associated methane-cycling communities on Earth have all led to excitement over the potential of such systems to host life on Mars, even into the present day. However, the habitability of subsurface serpentinizing systems on Mars does not necessarily follow from these qualitative observations.  In particular, while the production of H2 during serpentinization could provide methanogens with a needed substrate, the alkaline conditions and corresponding potential for carbon limitation that arise in concert are negatives against which H2 supply must be balanced.  We consider this balance via a coupled geochemical-bioenergetic model that weighs the outputs of serpentinization against the metabolic requirements of methanogenesis, in an energetic frame of reference.  

 

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What do biosignatures tell us

Started by Ken Jones in SAGANet Community Jul 11. 0 Replies

Lately there has been a lot of talk about biosignatures. I've even come across articles where they talk about using biosignatures to look for life beyond earth in the rocks here on earth by searching for biosignatures of past life in rocks. I'm just…Continue

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