Cell-to-cell communication by chemical signals, termed quorum sensing (QS), is a common regulatory scheme in the microbial world. Pseudomonas aeruginosa¸ an opportunistic pathogen of burn wounds and cystic fibrosis lungs, uses QS to control the expression of hundreds of genes, particularly those necessary for population level benefits such as biofilm...
Social behavior leading to the production of common goods is prone to exploitation. One such behavior in Pseudomonas aeruginosa is quorum sensing (QS), by which the bacteria produce signals to regulate extracellular common goods. Exploitation comes in the form of cheaters which have a mutation in the central quorum sensing...
Cell-cell communication in bacteria is understood to facilitate the coordination of population-wide cooperative behavior in the form of concerted gene expression. The opportunistic pathogen Pseudomonas aeruginosa uses such a communication mechanism to regulate a large group of genes important to virulence strategies in this bacterium. This general mechanism of communication...
In June 1988 the Japanese agreed to liberalize their
beef market which had been protected by an import quota
system for twenty-four years. The purpose of this thesis is
to draw conclusions/implications concerning the effect of
the trade agreement (1988 Import Quota Removal Agreement)
upon Japanese beef imports and the...
Research was conducted at the Starkey Experimental Forest and
Range in northeastern Oregon to determine cattle performance, diet
quality, botanical composition of forage ingested, and production
and utilization among rest-rotation, season-long, and deferred
rotation grazing systems. The grazing season lasted from June 20 to
October 10 of each year. Cows...
Declines in Greater Sage-Grouse (Centrocercus urophasianus, hereafter sage-grouse) populations could be attributed to low chick survival, which may be influenced by the availability of food and cover at sites used by females rearing broods. Habitat attributes important to broods may vary regionally; thus, it is necessary to understand factors affecting...
The western purple martin (Progne subis arboricola) is a species of conservation concern throughout the Pacific Northwest. In western Oregon, the purple martin nests in three major ecosystem types: inland open-water, coastal, and upland forest. The availability of suitable breeding habitat is a major limiting factor for western purple martin...
Research on grief has been studied for nearly a century to understand its many facets, expressiveness, and timing. In the field of counseling, many changes in theories, models, and the lenses through which loss is responded to have been accomplished. However, one constant in the U.S. culture is that definitions...