a total of 41 pure cultures of enterobacteriaceae , comprising 32 thermotrophic and nine psychrotrophic strains , pathogens or marker organisms , were examined for numbers of colony forming units obtained at 37 degrees and 42.5 degrees c ( thermotrophs ) and 30 degrees c ( psychrotrophs ) , when surface-plated on a rich infusion agar and violet red bile agar .
C0450254
pathogens
C0029235
organisms