102A Morrill Science Center IVN
Oceanography, University of Washington, 1996
James F. Holden, Ph.D.
Department of Microbiology
418 Morrill Science Center IVN
University of Massachusetts
639 North Pleasant Street
Amherst, MA 01003-9298
My laboratory conducts theoretical, experimental, and field observational research to quantitatively model microbial activity operating at diverse spatial and temporal scales. We study how individual species and microbial communities respond and adapt to environmental shifts to predict biological diversity and ecosystem dynamics. We are organismal physiologists who employ modern biological tools to link genotypes, phenotypes, and functional responses to integrate cellular behavior within and among organisms. We employ experimental and mathematical methods to investigate the underlying principles of metabolic pathways that then lead to emerging behaviors.
Our model systems are anaerobic thermophiles and hot subsurface environments, especially those at deep-sea hydrothermal vents. Below are descriptions of our current projects.
Rates and constraints:
We model how nutrients and energy sources define the limits of growth for various thermophiles and the impact of subseafloor life on marine biogeochemistry.
We model how interspecies cooperation and competition affects cell growth down to the gene expression level.
We examine microbial respiration of iron oxides and use spectroscopic techniques to identify biosignatures in nature and correlate those with host rock and fluid chemistry compositions.
We are exploring the feasibility of using hyperthermophilic heterotrophs to treat agricultural waste and produce hydrogen as a bioenergy product.
Physiology and ecology of hyperthermophilic archaea; Geomicrobiology of geothermal environments