<prompt> Thermatomyces is used in?Sterilization standardizationGram stainingSelective media preparationAntibiotic sensitivity  <response>: Ans. a Sterilization standardization. Ref. Ananthnarayan, Microbiology, 4th ed., 26, 29 For determining the efficiency of moist-heat sterilization Spores of bacillus stearothermophilus. For determining the efficiency of dry-heat sterilization Spores of non-toxigenic strains of C.tetani. 