HR: 08:00h
AN: B11A-01 INVITED     [PDF]
TI: Molecular Biogeochemistry of Manganese
AU: * Sposito, G
EM: gsposito@nature.berkeley.edu
AF: Division of Ecosystem Sciences, MC 3110, University of California, Berkeley, CA 94720-3110 United States
AU: Tebo, B M
EM: btebo@ucsd.edu
AF: Marine Biology Research Divison and Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, CA 92093-0202 United States
AU: Bargar, J
EM: bargar@ssrl.slac.stanford.edu
AF: Stanford synchrotron Radiation Laboratory, Stanford Linear Accelerator Center, P. O. Box 4349, Stanford, CA 94309 United States
AU: Spiro, T G
EM: spiro@princeton.edu
AF: Department of Chemistry, Princeton University, Princeton, NJ 08544 United States
AU: Villalobos, M
EM: marvilla@igiris.igeograf.unam.mx
AF: LAFQA, Grupo de Bioquimica Ambiental, Instituto de Geografia, UNAM, Circuito Exterior, Ciudad Universitaria, Mexico, Coyoacan, DF 04510 Mexico
AB: Molecular biogeochemistry is an emerging subfield of biogeosciences that has as its primary goal the elucidation of fundamental mechanisms for key surficial processes that determine ecosystem structure and function. The distinguishing feature of this new subfield is the application of molecular techniques, drawn from chemistry, physics, and microbiology, in order to characterize natural samples exhibiting significant heterogeneity and complexity. This approach is necessarily multidisciplinary in scope and multifaceted in execution. In this presentation an ongoing collaborative research project among the authors will be described to exemplify the kinds of issues and operational strategies that seem generic to any endeavor designed to establish the molecular mechanisms of biogeochemical phenomena. The topic to be addressed is the biogeochemistry of manganese, with emphasis on the pathways of bacterially-mediated oxidation of aqueous Mn(II), the structural chemistry of biogenic Mn(III,IV) oxides, and the metal sorption reactions these oxides engage. The dynamic interplay among microbiology, wet chemistry, spectroscopy, and ab initio molecular modeling in our studies will also be highlighted.
UR: http://mnbiooxides.ucsd.edu
DE: 0400 Biogeosciences
DE: 1615 Biogeochemical processes (4805)
DE: 3954 X ray, neutron, and electron spectroscopy and diffraction
DE: 4803 Bacteria
DE: 4851 Oxidation/reduction reactions
SC: Biogeosciences [B]
MN: 2003 Fall Meeting