For achieve the optimal fermentation efficiency of an antibiotic, this paper offers the effects of changed facts on antibiotic fermentation by cylinder-plate method.

One microbiological assay method (Cylinder-plate method) for the determination of azithromycin in human plasma was developed and validated and was us.

Potencies were unitied which determined by turbidimetric method and cylinder-plate method.

Fermented antibiotic got from laboratory and bacillus peptide are used as testing objects,cup-plate method is used upon them to determine the dis-infection potency.

By using cup-plate method,the influences of the thickness,pH value of culture medium and the designation cell density on the inhi.

Determining the Activities of Nisin from Lactococcus Lactis by Oxford Plate Assay System;

The conditions of detecting Nisin activities by oxford plate assay system were studied in this paper.

In order to establish a convenient and rapid method to detect the content of biotin,the oxford plate assay system used to detect content of biotin was studied in this paper using Corynebacterium ammoniagenes,which is auxotrophic for biotin,as indicator bacteria.

Method:Turbidimetric method was used to determine Capreomycin Sulfate,compared with diffusion method.

Methods Turbidimetric method was used to determine the titer of gentamycin sulfate granules and the findings were compared with those detected by diffusion method.