A national investigation of the prevalence and diversity of thermophilic Campylobacter species in agricultural watersheds in Canada.

The occurrence and diversity of thermophilic Campylobacter species (C. jejuni, coli, and lari) were studied in water samples from four river basins located across Canada. These basins located in Quebec (Bras d'Henri), Alberta (Oldman), Ontario (South Nation), and British Columbia (Sumas) represented some of the most intensive farming areas in Canada for hog, beef cattle, dairy cattle, and poultry, respectively.

Effect of incubation temperature on the detection of thermophilic campylobacter species from freshwater beaches, nearby wastewater effluents, and bird fecal droppings.

This large-scale study compared incubation temperatures (37°C versus 42°C) to study the detection of thermophilic Campylobacter species, including Campylobacter jejuni, C. coli, and C. lari, in various surface water samples and bird fecal droppings around Hamilton Harbor, Lake Ontario.

Methylene blue derivatization then LC-MS analysis for measurement of trace levels of sulfide in aquatic samples.

The methylene blue method has been widely used for analysis of sulfide for more than 100 years. Direct measurement of methylene blue at nanomolar concentrations is impossible without a preconcentration step, however. In this study the response of LC-MS with electrospray ionization (ESI) to methylene blue was evaluated.