Why are undefined media more desirable

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Why are undefined media more desirable than defined media, especially when it is a selective or differential media? for example, eosin methylene blue agar is a selective undefined medium. Why is that formulation desirable?

Reference no: EM13149180

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Why are undefined media more desirable : Why are undefined media more desirable than defined media, especially when it is a selective or differential media? for example, eosin methylene blue agar is a selective undefined medium. Why is that formulation desirable?
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