I study geomicrobiology, in particular the interactions between microbes and minerals. My research focuses on microbial mineralization, including characterizing mineral phase, morphology, and reactivity, as well as investigating the roles microbes play in precipitation and crystallization processes. I take a multidisciplinary approach, combining geochemical field characterization and sampling, molecular biology, biochemistry, culturing and a wide variety of microscopy and spectroscopy techniques.
Department of Geological Sciences
Biosignatures of Fe-Oxidizing Microbes - Microbial Fe oxidation occurs in low oxygen, Fe-rich redox gradient environments, where abiotic oxidation rates are slow. We hypothesize that Fe-oxidizing microbes (FeOM) play important roles in these gradient environments where they fix carbon and precipitate reactive Fe minerals. Read More
Microbe-S(0) interactions - We are working with a model S-oxidizing phototroph,Chlorobaculum tepidum, in collaboration with Tom Hanson, funded by the UDRF Strategic initiatives program and NSF. Read More
B.S., Geological and Environmental Sciences, Stanford University, 1997
M.S., Civil and Environmental Engineering, Stanford University, 1998
Ph.D., Earth and Planetary Science, University of California, Berkeley, 2006
Kato, S., Ohkuma, M., Powell, D. H., Krepski, S. T., Oshima, K., Hattori, M., Shapiro, N., Woyke, T., and Chan, C. S. (2015) Comparative genomic insights into ecophysiology of neutrophilic, microaerophilic iron oxidizing bacteria, Frontiers in Microbiology, doi: 10.3389/fmicb.2015.01265.
Hanson, T. E., Bonsu, E., Tuerk, A., Marnocha, C. L., and Chan, C.S. (2015) Chlorobaculum tepidum growth on biogenic S(0) as the sole photosynthetic electron donor, Env. Microbiol., doi: 10.1111/1462-2920.12995.
McAllister, S. M., Barnett, J. M., Heiss, J. W., Findlay, A. J., MacDonald, D. J., Dow, C. L., Luther, III, G. W., Michael, H. A., and Chan, C. S. (2015) Dynamic hydrologic and biogeochemical processes drive microbially enhanced iron and sulfur cycling within the intertidal mixing zone of a beach aquifer, Limnol. Oceanogr., 60, 329-345.
MacDonald, D. J., Findlay, A.J., McAllister, S. M., Barnett, J. M., Hredzak-Showalter, P., Krepski, S. T., Cone, S. G., Scott, J., Bennett, S. K., Chan, C. S., Emerson, D., Luther, G. W. (2014) Using in situ voltammetry as a tool to search for iron oxidizing bacteria: from fresh water wetlands to hydrothermal vent sites, Env. Sci. Process. Impact, 16, 2117-2126.
Geomicrobiology, biomineralization, biofilms, biosignatures, nano-and environmental mineralogy, environmental geochemistry.