When iron levels are low, the opportunistic pathogen Pseudomonas aeruginosa secretes the high-affinity iron-binding siderophore pyoverdine. The cognate ferripyoverdine receptor, FpvA, has gained attention as the most divergent gene in the organism’s genome, showing substantial evidence of positive selection. S-type pyocins, bacteriocins with specificity to Pseudomonads, enter cells through FpvA...
The purpose of this project is to study which methyl-accepting chemotaxis proteins (MCPs) are related to chemotaxis of Vibrio cholerae. 44 MCP mutant strains were tested in seven different chemoattractants and the resulting swarm circle size was compared to that of C6706 lac-Z wildtype. Several genes were identified that resulted...
Full Text:
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Chemotaxis of Vibrio cholerae
*RochelleGlover, *Evan Dishion, Dr. Claudia Häse
The purpose of this project is to study which methyl-accepting chemotaxis proteins (MCPs) are related to chemotaxis of Vibrio cholerae. 44 MCP mutant strains were tested in seven different chemoattractants and the resulting swarm circle size was compared to that of C6706 lac-Z wildtype. Several genes were identified that resulted...
Full Text:
): 193-201
Chemotaxis of Vibrio cholerae
*RochelleGlover, *Evan Dishion, Dr. Claudia Häse
Häse Lab
Pseudomonas aeruginosa is an environmental bacterium which
opportunistically infects humans. Commonly residing in irondepleted
environments, P. aeruginosa uses iron-chelating
molecules called siderophores to scavenge iron from its
environment. The most prevalent siderophore used by P.
aeruginosa is known as pyoverdine. After the cell synthesizes and
secretes pyoverdine, the molecule binds...
The purpose of this project is to study which methyl-accepting chemotaxis proteins (MCPs) are related to chemotaxis of Vibrio cholerae. 44 MCP mutant strains were tested in seven different chemoattractants and the resulting swarm circle size was compared to that of C6706 lac-Z wildtype. Several genes were identified that resulted...
Nutritional ecology of unhunted and sympatric populations of
Roosevelt elk, Cervus elaphus roosevelti, and Columbian black-tailed
deer, Odocoileus hemionus columbianus, was investigated in old-growth
forests of the Hoh Valley in Olympic National Park, Washington, from
September 1979 to November 1981. Seasonal diets of both cervids
generally were comprised of common...
Black bears (Ursus americanus) in western Oregon and Washington peel bark from conifers in early spring to forage on the sugar-rich phloem and cambial tissues. This provides important energy at a time when similarly attractive forage is scarce. Bears often damage Douglas-fir (Pseudotsuga menziesii) trees in stands that are intensively...
The Gulf of Aqaba, northern Red Sea, is an ideal natural laboratory for studying the
impact of atmospheric dry deposition of iron to the ocean surface. We have measured
atmospheric iron deposition weekly for 18 months, and dissolved and total dissolvable
iron concentrations in the stratified summer (August) and well-mixed...
Pseudomonas aeruginosa is a ubiquitous gram-negative bacterium that is capable of causing infections in people who are immune compromised. The bacterium can live in a variety of environments due to the variety of virulence factors it can produce. It is well adapted to living in iron-stringent conditions because it can...