Clara Chan

Visiting Assistant Professor of Geology

Spring 2008

  • Mineralogy (GEO 202)
  • Mineralogy (GEO 202L1)
Local Phone 208-1605
E-Mail cchang@bowdoin.edu
Clara Chan Bowdoin Geology

Education

Ph. D., University of California, Berkeley
M.S., Stanford University
B. S., Stanford University

Research Interests

Geomicrobiology, biomineralization, biofilms, bioremediation, biomarkers, nano- and environmental mineralogy, environmental geochemistry

Publications:

Journal Articles

Chan, C. S., de Stasio, G., Welch, S. A., Girasole, M., Frazer, B., Nesterova, M., Fakra, S. and Banfield, J. F. Microbial polysaccharides template assembly of nanocrystal fibers. Science, 303: 1656-1658 (2004).

Banfield, J. F., Moreau, J. W., Chan, C. S., Welch, S. A. & Little, B. Mineralogical biosignatures and the search for life on Mars. Astrobiology, 1: 447-467 (2001).

Papers submitted

Chan, C. S. and Banfield, J. F. Geomicrobiology of iron oxyhydroxide-depositing microbial mats in a circumneutral pH terrestrial environment. Appl. Environ. Microbiol. (under revision)

Chan, C. S., Fakra, S., Edwards, D. C., Emerson, D. and Banfield, J. F. Iron oxyhydroxide mineralization on microbial polymers. Geochim. Cosmochim. Acta (under revision)

Emerson, D., Rentz, J. A., Lilburn, T. G., Davis, R. E., Aldrich, H.,Chan, C. S., Moyer, C. L. A novel lineage of proteobacteria involved in formation of marine Fe-oxidizing microbial mat communities. PLoS One (under revision)

Manuscripts in preparation

Chan, C. S., Emerson D. and Edwards K. J. Ultrastructure and mineralogy of Mariprofundus ferrooxydans, a marine iron-oxidizing microbe.

Jeans, C., Singer, S. W.,Chan, C. S., VerBerkmoes., N. C., Hettich, R. L., Banfield, J. F., and Thelen, M. P. Cytochrome 572, a novel iron oxidase isolated from an acidophilic microbial community.

Selected Abstracts

Invited presentations

Chan, C. S. 2006. Biomineralization of marine and terrestrial iron-oxidizing microbes. Pacific Northwest National Laboratory, November 17, 2006. invited talk.

Chan, C. S. 2006. How microbes become microfossils: a story of iron-oxidizing bacteria. University of Vermont Department of Geology seminar, October 16, 2006. invited talk.

Chan, C. S., Thelen, M., Hwang, M., and Banfield, J. F. 2005. Characterization and localization of iron-oxidizing proteins in acid mine drainage biofilms. American Geophysical Union Fall 2005 meeting, invited talk.

Chan, C. S., Fakra, S., De Stasio, G., and Banfield, J. F. 2003. Molecular mechanisms of iron oxyhydroxide biomineralization. American Geophysical Union Fall 2003 meeting, invited talk.

Chan, C. S., Nesterova, M., Welch, S. A., De Stasio, G., and Banfield, J. F. 2003. Microbial polymer templation of iron oxyhdyroxides. Stanford Synchrotron Radiation Laboratory users meeting 2003, invited talk.

Other presentations

Chan, C. S., Emerson, D., and Edwards, K. J. 2006. Biomineralogy and morphology of the marine iron-oxidizing bacterium Mariprofundus ferrooxydans. American Geophysical Union Fall 2006 meeting, talk.

Chan, C. S., Fakra, S., and Banfield, J. F. 2004. Iron oxyhydroxide mineralization by microbes in terrestrial environments. American Geophysical Union Fall 2004 meeting, poster.

Chan, C. S., Nesterova, M., Welch, S. A., De Stasio, G., and Banfield, J. F. 2003. Microbial polymer templation of iron oxyhdyroxides. Goldschmidt conference 2003, talk.

Chan, C. S. and Banfield, J. F. 2003. Roles of microbial communities and polymers in iron oxide mineralization. American Society for Microbiology 2003 General Meeting, poster.
Chan, C. S. and Banfield, J. F. 2002. Microbial communities associated with biogenic iron oxide mineralization in circumneutral pH environments. American Geophysical Union Fall 2002 meeting, poster.

Chan, C. S., Skatvold, A. M., Labrenz M., Welch S. A., and Banfield, J. F. 2001 Phylogenetic analysis of microbial populations associated with iron cycling in the Piquette Mine in Tennyson, Wisconsin. American Geophysical Union Fall 2001 meeting, poster.

Druschel, G. K.,Chan, C. S., Moreau, J., Thomsen-Ebert, T., Labrenz, M., Fowle, D., Welch, S. A., and Banfield, J. F., 2001. Biogenic precipitation of monomineralic nanocrystalline sulfides: Implications of observed and modeled processes to metal contaminant remediation and ore deposition. 2001 Goldschmidt conference.

Roberts, M.A.,Chan, C. S., Howell, D.G., Wentworth, C.M., and Jachens, R.C. 1998. 3-D geologic maps. American Association of Petroleum Geologists Annual Meeting.

Research Funding and Support

NSF Ridge 2000 postdoctoral fellowship awarded for “Linking genetics and mineralization of iron- oxidizing microbes at midocean ridges” award no. 0526285.

Cryoelectron and high resolution transmission electron microscope time (2 weeks) awarded for “Biomineralogy and ultrastructure of neutrophilic iron-oxidizing bacteria,” Environmental Molecular Sciences Laboratory, Pacific Northwest National Lab 19812.

Advanced Light Source beamtime awarded for “Microbial polymer templation of iron oxide mineralization in biofilms and biomimetic synthesis: a STXM investigation” ALS-01290.