what is the principal of urea hydrolysis test?
what is the principal of sugar utilization test?
what is the principal of methyl red test?
what is the principal of standard plate count technique?
what is the principal of starch hydrolysis test?
what is the principal of presumptive test?
what is the principal of voges proskauer test?
what is the principal of gelatin hydrolysis test?
what is the principal of indole test?
what is the principal of citrate utilization test?