Maki, R. P.. University of Minnesota-Duluth, rmaki@d.umn.edu
Aas, P. P.. University of Minnesota-Duluth, paas@d.umn.edu
Hicks, R. E.. University of Minnesota-Duluth, rhicks@d.umn.edu

 
EFFECT OF DIFFERENT SUSPENDED PARTICLES ON THE SURVIVAL AND VIABILITY OF SALMONELLA TYPHIMURIUM IN FRESHWATER MICROBIAL COMMUNITIES
 
Experiments were conducted in rolling tanks to determine if the presence of suspended particles affects the survival or viability of a pathogenic bacterium, Salmonella typhimurium. Water from the Duluth harbor of Lake Superior, including native microorganisms, was inoculated with Salmonella typhimurium cells (1-10 billion cells/L). One of three particle types (flocculent organic particles, clay, or silt sediment) was added to each rolling tank in a range of concentrations (0-30 mg/L). In the experiment with suspended clay sediment, the Salmonella population was less than 10% of the initial inoculum after 28 days. Salmonella cell abundances in experiments with suspended silt and flocculent organic particles decreased to <0.02% of the initial inocula within 19 days. Control tanks (no particles added) were included in each experiment. The decline in Salmonella cell numbers was similar in control and treatment tanks indicating that the presence of suspended particles had a limited effect on the persistence of total Salmonella cells. SS10 SS41 SS17 Oral
 
Day: Thursday, Feb. 4
Time: 12:15 - 12:30pm
Location: Sweeney Center
 
Code: SS10TH1215S