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The nutrition medium prepared by manual work is called culture media in microbiology, which is to help microorganisms to develop, breed and accumulate metabolites. The medium in microbiology usually includes water, nitrogen source, mineral salt with micro elements, carbon source, growth factor with vitamin, amino acid, basic group, antibiotics, pigments, hormone and serum and many more.

"Performance Characteristics of Contact Agar Medium 5x5 1. It is widely used in environmental sanitation, apparatus, sedimentation bacteria and hand colony inspection. 2. It can be used directly after opening, no need to prepare medium which saves time and effort. 3. The medium area is 24 cm². It is divided into several small cells which are easy to count."