The A segment of infectious pancreatic necrosis virus (IPNV)
is expressed as a polyprotein encoding three primary gene
products, VP2, NS and VP3, from a large open reading frame. The
nucleotide sequence for the A segment of the Sp isolate of IPNV
was determined. The NS protein is the putative...
Clostridium difficile is the causative agent of the majority of antibiotic associated diarrheas. C.
difficile spores are recognized as the morphotype of transmission, infection and persistence.
However, there is a lack of knowledge on how C. difficile spores interact with the host’s
epithelial surfaces. In this context, we have characterized...
Three closely related isolates belonging to the A₁ serotype of infectious pancreatic
necrosis virus (IPNV) were selected for comparison, to provide insight into the nature of
variation in the virulence of IPN viruses. Brook trout fry (Salvelinus fontinalis) were
experimentally infected with the three isolates by immersion. Cumulative mortalities over...
Previous studies of six Oregon public water supply systems revealed that greater proportions of the standard plate count (SPC) bacteria from distribution waters were multiple antibiotic resistant (MAR) compared to isolates from the corresponding source raw waters. In the present study, two of these water systems were examined further to...
Bioremediation in the vadose zone is unpredictable because of poor understanding of factors influencing microbial growth in this environment. A lab-scale experimental system was developed to examine, noninvasively, interactions between microbial growth, water flow, and solute transport in unsaturated porous media. Measurements of microbial colonization, and its impact on hydrology,...
The myxozoan parasite of salmonids, Ceratomyxa shasta, is established throughout the Klamath River, CA-OR, with high parasite densities below the series of dams and above the dams (upper basin) in the northernmost tributary, the Williamson River (WMR). Two objectives were designed to address concerns about C. shasta effects on reintroduced...
Toxin production by cyanobacterial harmful algal blooms (cyanoHABs) in freshwater systems has lasting ecological and human impacts. Nutrients, light availability, hydrology, and microbial community composition impact the frequency and intensity of toxic cyanoHABs. Climate change will exacerbate toxic cyanoHABs, making real time and predictive monitoring a vital tool for managing...