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Brian Eddie
I am a working on my M.S. in Microbiology, after graduating from ASU in 2005. My thesis will involve a molecular survey of the dominant microorganisms within sea ice. Using DGGE, I will examine the changes in microbial communities between locations around Barrow, AK, and between levels within the ice. This work will also help in understanding carbon cycling processes within the sea ice by getting a better understanding of the organisms that are there. I have also recently finished up a project examining the effects of salinity and temperature on the growth rate of a green alga that was isolated from sea ice of the coast of Barrow. This Chlamydomonas isolate was able to grow at -5°C, and at salinities ranging from freshwater to three times ocean salinity. This summer, I will be collaborating with a researcher at NASA's Jet Propulsion Lab, to determine the effects of a jet exhaust on biological signatures within ice. This work will hopefully be of benefit to designing landers to some of the icy moons in the solar system, by determining the extent and depth of the impacted layer when the landing thrusters are fired near extremely cold ice in a vacuum.
Eddie, B J, Krembs, C. and Neuer, S. 2007. Growth response to temperature and salinity of psychrophilic, halotolerant Chalmydomonas sp ARC isolated from Chukchi sea ice. Marine Ecology Progress Series, submitted.