تصاویر باکتری هاThe Spectrum of Microorganisms is Diverse
non-selective medium
Blood agar and chocolate agar, and examples of complex and non-selective environment that Any variety of bacteria are capable of growth on the environment. Non-selective medium for isolation of bacteria of unknown samples are important. When a clinical sample is injected into a non-selective medium, several types of bacterial colonies are visible.
the selective environment:
Because of the diversity of microorganisms in the sample material (eg, gastrointestinal) are stationary, the selective environment in order to eliminate (or reduce) the sample used in unrelated bacteria. Based on an element of choice environment growth inhibitor for Unwanted bacteria against bacterial pathogens is based. Examples of these include:
Sodium Zayd - against gram-positive bacteria, Gram-negative bacteria can be selected.
Bile salts: in the Enteric gram-negative bacteria And elimination of gram-negative bacteria and mucosal tissues are usually gram-positive bacteria.
Colistin and nalidixic acid to inhibit growth of Gram-negative bacteria.
Taken from medical microbiology Jawetz
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Ats bacteriology 
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