Microbiology of the food chain. Horizontal method for the enumeration of beta-glucuronidase-positive $iE$is$ic$ih$ie$ir$ii$ic$ih$ii$ia $ic$io$il$ii. Colony-count technique at 44 $0D C using membranes and 5-bromo-4-chloro-3-indolyl beta-D-glucuronide— 20 стр.