**apologies for duplicate postings**

Dear Colleagues,

AGU abstracts are due this Thursday at 1659 PST.

We hope you will consider submitting to our session B29 - From cells to
cycles: the impacts of microbially mediated redox reactions on modern and
paleo global biogeochemistry.  If you have any questions regarding the
session please feel free to email either of the conveners listed below.

Invited presentations at this session will be given by:
James Farquhar (U Maryland College Park)
Peter Girguis (Harvard)
Linda Kalnejais (U New Hampshire)
Daniel Sigman (Princeton)

Also, just a reminder that student travel scholarships are available.  For
more info, see:
http://www.agu.org/meetings/fm07/?content=outreach

Best regards!

Sasha Turchyn ([log in to unmask])
John Moreau ([log in to unmask])

Session Description:
Microbially mediated redox reactions govern the ultimate fate of carbon in
the oceans, determining whether organic matter becomes sequestered into
marine sediments or transformed into carbon dioxide or methane. On short
time scales, microbial processes thus significantly impact the marine
carbon budget. Over longer time scales these processes influence the redox
state of the ocean, the behavior of various elemental cycles, and
atmospheric oxygen. Understanding the connections between marine microbial
metabolisms, coupled redox cycles, and organic matter degradation pathways
thus yields important insights into modern carbon burial as well as the
paleo-record of climate and ocean chemistry variability. Recent analytical
advancements in this area include the use of sensitive isotope tracers
(e.g. ?56Fe, ?33S) and new high-resolution techniques (e.g. NanoSIMS) to
explore microbial biochemical pathways, and to quantify the impact of
biological redox reactions on both global ocean chemistry and local
sediment dynamics. This session will bring together researchers who
explore microbially mediated redox-related biogeochemical processes with
those who study the far-reaching impacts of these processes on global
ocean and paleo-biogeochemical signatures.