Biogeochemistry Group
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Overview
As of October 2011 the former separate entities of the Biogeochemistry, Mathematical Modeling and Nutrient Groups are completely merged together into one ‘Biogeochemistry Group’. Research in the newly merged Biogeochemistry Group continues to focus on microbiological and geochemical processes that control nutrient and element cycling in the marine environment. Researchers use a combination of newly developed geochemical, microbiological and molecular techniques to study the environmental regulation of these processes, and their effects on the global biogeochemical cycles.
Current News
The Cryptic Sulfur Cycle
Former Biogeochemitry Group member and doctoral student Lars Holmkvist recently published a paper in Geochemica et Cosmochimica Acta (v75, p3581-3599) titled: A cryptic sulfur cycle driven by iron in the methane zone of marine sediment (Aarhus Bay, Denmark).
With 
Bo Barker Joergensen (MPI for Marine Microbiology, Bremen & Centre for Geomicrobiology, Aarhus) and 
Tim Ferdelman, Holmkvist shows how the combination of well-established sulfur–iron–carbon reactions may lead to the deep formation of sulfate and drive a cryptic sulfur cycle. The iron-rich post-glacial sediments underlying Holocene marine mud stimulate the strong sub-surface sulfide reoxidation observed in Aarhus Bay.
Lars is now working as a research scientist at the Danish Technological Institute, Life Sciences Division.
Recently in ISME
In the September issue, group members Rachel Foster, Marcel Kuypers, Tomas Vagner, and Niculina Musat along with collaborators Ryan Paerl and Jonathan Zehr from the University of California, Santa Cruz published their article "Nitrogen fixation and transfer in open ocean diatom–cyanobacterial symbioses".
Read this Open Access article online.
In the October issue, former group member Marlene Jensen, along with her co-authors from the Max Planck Institute for Marine Microbiology, the University of Aarhus, the Institute of Coastal Research (Geesthacht, Germany), the University of Hamburg and Radbound University Nijmegen published their article "Intensive nitrogen loss over the Omani Shelf due to anammox coupled with dissimilatory nitrite reduction to ammonium".
Read this article online (subscription required).