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"The overall objective of our research program is to understand how and
why microorganisms and geological media (rocks, minerals,
nanoparticles, and water) interact and how we can use their mutual
interactions to understand a range of geological and microbial
processes on Earth and to benefit our society."
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Description of Research
Dr. Dong's research is focused on the following broad areas: 1)
nanoscale investigations of clay mineral-microbe interactions and
implications for microbial ecology and organic matter maturation and
petroleum migration in sedimentary basins; 2) effect of nanoparticles
(minerals, colloids, both synthetic and natural) on microbial survival
and metabolic functions; 3) nanoparticles of viruses transport in
groundwater and their removal via filtration; 4) environmental
bioremediation of heavy metals and radionuclides using bacteria and
clay nano-particles. We employ a number of geological, mineralogical,
geochemical, and microbiological (both molecular and cultivation based)
tools to study these processes. Among these, transmission electron
microscopy (TEM) and environmental cell TEM, and electron energy loss
spectroscopy (EELS), are essential tools to directly image
nanoparticle-microbe interactions at a high spatial resolution. We also
employ analytical electron microscopy and EELS to create maps of
chemical elements as well as oxidation states of heavy metals.
Undergraduate researcher's roles in your lab
Undergraduate students assist graduate students to carry out research
projects. In addition, they make presentations at national and
international conferences. They either lead or participate (as a
co-author) in peer-reviewed publications.
Graduate student's role in your lab
Graduate students are primary work force in my lab, carrying our NSF-,
DOE, PRF-funded research projects on a day-to-day basis. They present
their research results at national and international meetings and
publish in peer-reviewed journals as lead authors.
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| Presentations |
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Ye, Q., Jiang, H., Ji, S., Dong, H., and Zhang, C. (2006) Survey of
archaeal diversity in sediments of Qinghai Lake, China and implications
for paleoclimate change. AGU Fall meeting, San Francisco, CA, December,
2006.
Jaisi, D.P., Dong, H., Heald, S., Fredrickson, J.K., and Plymale, A.E.
(2006) Influence of competitive electron acceptors during reduction and
effective immobilization of technetium by reduced nontronite. AGU Fall
meeting, San Francisco, CA, December, 2006.
Mailloux, B.J., Van Geen A., Zhang, Y., Stute, M., Datta, S., Horneman,
A., Mislowack, B.J., Dong, H., Freyer, G., and Assaf-Anid N. (2006)
Linking bacterial activity and diversity in the shallow aquifers of
Bangladesh. Geological Society of America Abstracts with Programs, Vol.
38, No. 7, p. 29
Dong, H., Rech, J.A., Jiang, H., Sun, H., and Buck, B.J. (2006)
Endolithic cyanobacteria in soil sulfates from hyperarid environments
on Earth. Geological Society of America Abstracts with Programs, Vol.
38, No. 7, p. 521.
Dong, H. (Invited, Pardee lecture, GSA, 2006) Geomicrobiology in
extreme environments: linking geological processes with microbial
activities. Geological Society of America Abstracts with Programs, Vol.
38, No. 7, p. 390
Jaisi, D.P., Dong, H., Fredrickson, J.K., and Plymale, A.E. (2006)
Reactivity of Fe(II) associated with biologically and chemically
reduced nontronite to technetium reduction. Geological Society of
America Abstracts with Programs, Vol. 38, No. 7, p. 44
Bishop, M.E., Jaisi, D.P., and Dong, H. (2006) Bioavailability of
Fe(III) in loess sediments. GSA Abstracts with Programs, Vol. 38, No.
7, p. 138.
Zhang, C., Campbell, B., Liu, X., Shao, Z., Wang, F., Xiao, X., and
Dong, H. (2006) Geochemical and Microbiological Characterization of
Microbial Communities Mediating Carbon Cycle in Mid-Ocean, Western
Pacific Geophysical Meeting, Beijing, July 24-27, 2006.
Zhang, G., Dong, H., Jiang, H., Hedlund, B.P., and Xie, Z. (2006) Iron
redox cycling in the deep subsurface. Western Pacific Geophysical
Meeting, Beijing, July 24-27, 2006.
Wu, N., Dong, H., Suess, E., Jiang, H., Ye, Y., Zhang, C., Rowe, H.,
and Huang, Y. (2006) Mineralogical Features and C-O Isotope Composition
of Methane-derived Carbonate Build-up Found in the Northeastern South
China Sea, Western Pacific Geophysical Meeting, Beijing, July 24-27,
2006.
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| Funding |
$100.000 Grant from the State of Ohio
Nanomaterials in our Environment
$100.000 Grant from the State of Ohio
Nanomaterials in our Environment
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| Publications |
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Zhang, G., Dong, H., Jiang, H., Xu, Z. and Eberl D. (2006) Unique
microbial community in drilling fluid from Chinese Continental
Scientific Deep Drilling. Geomicrobiology Journal, 23, 499-514.
Jiang, H., Dong, H., Zhang, G., Yu, B., Chapman, L.R., and Fields, M.W.
(2006) Microbial diversity in water and sediment of Lake Chaka: an
inland hyersaline lake in Northwestern China. Applied and
Environmental Microbiology, 72(6), 3832-3845.
Dong, H., Scheibe, T.D., Johnson, W.P., Monkman, C.M. and Fuller, M.E.
(2006) Change in collision efficiency with distance in bacterial
transport experiments. Ground Water, 44(3), 415-429
Dong, H., Zhang, G., Jiang, H., Yu, B., Chapman, L.R., Lucas, C.R., and
Fields, M.W. (2006) Microbial diversity in sediments of saline Qinghai
Lake, China: linking geochemical controls to Microbial Ecology.
Microbial Ecology, 51(1), 65-82.
Seabaugh, J.L., Dong, H., Kukkadapu, R.K., Eberl, D., Morton, J.P., and
Kim, J.W. (2006) Microbial reduction of Fe(III) in the Fithian and
Muloorina illites: contrasting extents and rates of bioreduction.
Clays & Clay Minerals, 54(1), 67-79.
Jaisi, D.P., Dong, H., Kim, J.W., He, Z., and Morton, J.P. (2006)
Particle aggregation kinetics during microbial reduction of Fe(III) in
nontronite. Clays & Clay Minerals, in press.
Jaisi, D.P., Kukkadapu, R.K., Eberl, D.D., and Dong, H. (2005) Control
of Fe(III) site occupancy on the extent and rate of microbial Fe(III)
reduction in nontronite. Geochimica et Cosmochimica Acta, 69(23),
5429-5440.
Zhang, G., Dong, H., Xu, Z., Zhao, D., and Zhang, C. (2005) Bacterial
diversity in ultra-high pressure rocks and fluids from the Chinese
Continental Scientific Drilling in China. Applied and Environmental
Microbiology, 71(6), 3213-3227.
Kim, J.W.^, Dong, H.^, Seabaugh, J., Newell, S.W., and Eberl, D.D.
(2004) Role of Microbes in the Smectite to Illite Reaction. Science,
303, 830-832. ^: equal contribution.
Dong, H., Kostka, J.E., and Kim, J.W. (2003) Microscopic evidence for
microbial dissolution of smectite. Clays and Clay Minerals, 51(5)
502-512.
Dong, H., Kukkadapu, R.K., Fredrickson, J.K., Zachara, J.M., Kennedy,
D.W. and Kostandarithes, H.M. (2003) Microbial reduction of structural
Fe(III) in illite and goethite, Environmental Science and Technology,
37(7), 1268-1276.
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