◆ SpookStack

Results - Heat Stability at 70°C Mean values of the plate counts i the standard deviation were plotted on semi-log graph paper. "Best Fit" regression lines were drawn. The regression lines were not calculated via computer with a statistical program. They were drawn "by eye."! The time in minutes required for 50% inactivation of each preparation at 70°C was determined on the graphs. Maximum and minimum inactivation times were also determined by graphing regression lines within the standard deviation points. Strain 50% Inactivation times in minutes {Z0991 Average Maximum Minimum Dugway - 1152 1848 804 SPS 022.266 - 1384 2076 1050 488 - 353 450 283 462 - 162 186 153 Although SPS 022.266 preparation appeared to be approximately 20% more heat stable than the Dugway spores at 70°C, this difference was not statistically significant. With 95% con
dence, it can be stated that the "Dugway Ames" spore preparation was different from the 488 and "462 Ames" spore preparations with respect to the heat stability test. With 95% confidence, it can also be stated that the SPS 022.266 preparation was different from the 488 and 462 spore preparations with respect to the heat stability test. Name/Date - Name/Date - 3