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<p>Our next speaker in the EOAS Colloquium this Friday Sept 25 at
3:30 pm will be<br>
</p>
<p><font size="+2">Dr. Kim Popendorf </font>of the University of
Miami</p>
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<p class="MsoNormal"><font size="+2">Microbial Efficiency:<span style="mso-spacerun:yes">
</span>New ways to look at how microbes move energy and material
through the
ocean</font></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Marine microbes are responsible for large,
critical fluxes
of material on a global scale—playing a central role in
maintaining the ocean
as a global carbon sink, and generating half of the oxygen in the
atmosphere on
an annual basis.<span style="mso-spacerun:yes"> </span>The
magnitude and fate
of the ocean as a carbon sink is dependent on the efficiency of
microbial
processes: of the carbon that microbes consume, how much is
transformed into
biomass that can be passed up the food chain or exported from the
water column,
versus carbon that is respired and can ultimately return to the
atmosphere?<span style="mso-spacerun:yes"> </span>Our lab has
developed and deployed new
methods for measuring the production rates of marine microbes,
particularly
heterotrophic bacteria, and for measuring the rates of energy use
(respiration)
in diverse microbes.<span style="mso-spacerun:yes"> </span>Using
membrane phosphoplipid
turnover rates to measure bacterial production rates across the
Atlantic and Pacific
we demonstrate that heterotrophic bacteria may be growing at much
faster rates
than the standard paradigm, indicating that the microbial loop may
be recycling
material more rapidly than previously assumed.<span style="mso-spacerun:yes">
</span>Combining this with a new way to measure the rates of
energy utilization
in marine microbes—by measuring the turnover rate of adenosine
triphosphate
(ATP) in cells—we can investigate variations microbial efficiency
across
diverse environments.<span style="mso-spacerun:yes"> </span>By
measuring microbial
ATP concentrations across the South Pacific and comparing to other
measures of biomass,
community composition, and nutrient resources we provide new
insights on
microbial metabolic strategies that may underlie variations in
microbial
efficiency in the ocean.</p>
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<p class="MsoNormal">Via Zoom:</p>
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</p>
<p class="MsoNormal"><font size="+2"><a target="_blank" style="word-wrap: break-word;" href="https://fsu.zoom.us/j/96084968234">https://fsu.zoom.us/j/96084968234</a></font></p>
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<p class="MsoNormal">Please contact Dr Angie Knapp if you would like
to meet with the speaker.</p>
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