[QSB-postdocs] Fwd: [Enviro-lunch] Fwd: Thursday 10/25: Marjorie Schulz

[Miriam Barlow]

---------- Forwarded message ---------
From: Nathaniel Bogie <nbogie at ucmerced.edu>
Date: Mon, Nov 26, 2018 at 6:42 PM
Subject: [Enviro-lunch] Fwd: Thursday 10/25: Marjorie Schulz
To: enviro-lunch at lists.ucmerced.edu <enviro-lunch at lists.ucmerced.edu>


Hello Everyone,

We were able to reschedule Marjorie Schulz's talk for *this Thursday, Nov.
29*, 12-1pm in Room SE2-302.


Looking deep to understand SOM-mineral relationships: Rhizospheres and
Biofilms

[image: image.png]

Soil organic matter (SOM) in deep (>30 cm) soil is microbially processed.
Integration of microbial carbon into a long-term carbon pool is not well
understood but known to be related to associations with short range ordered
(SRO) minerals and/or soil aggregates. However, there remains a significant
knowledge gap; we do not yet understand the processes occurring at the
microbe-mineral interface. Soil microbial processes have been studied
mostly through bulk measurements such as soil respiration and enzymatic
assays. Where the microbes inhabit and interact with soil minerals is not
well established. Scanning electron microscopy (SEM) images demonstrate
that SOM mineral interfaces are commonly microbial biofilms and their
remnants illustrating the importance of biofilm production in generating
SOM. These images also show that fungi and biofilms weather primary mineral
grains, that soil organo-cutans are biofilms, and that biologic
precipitation of SRO minerals occurs in biofilms, likely co-precipitating
with organic compounds. This work shows how SEM can be used without
extensive sample preparation to image SOM.

Jorie has a BA in geology from Knox College and an MS in geology from
University of Missouri. She has worked at the USGS since 1987, first in the
branch of Marine Geology with a project studying Fe-Mn crusts. She
transferred to National Research Program of the Water Division in 1990 to
work with Art White on mineral dissolution rates. This project used soil
chronosequences to studying long term dissolution rates of primary
minerals. The work in soil chronosequences has continued to the present
giving Jorie an appreciation of the effect of time. She is currently a lead
scientist on a project titled, Biogeochemistry of soils: carbon/water/rock
interaction in the critical zone.


When: 11/29 Thursday, 12pm – 1pm



Where: SE2-302



Coffee will be provided, please bring your own mugs.



We look forward to seeing you,



Nate & Jing



Organizers for Fall 2018: Nate Bogie and Jing Yan

Faculty coordinator: Asmeret Asefaw Berhe

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-- 
Miriam Barlow
Founding Faculty and Professor
Chair, Quantitative and Systems Biology
University of California, Merced

209.228.4174
miriam.barlow at gmail.com
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