Answer Posted / sonia
in some cases usually nonpathogenic bacteria tend to
overgrow the pathogenic ones, in such cases , substances
which have a stimulating effect on the bacteria to be grown
or an inhibitory effect on those to be suppressed are
incorporated in the medium. if such substances are added to
a liquid medium the result is an absolute increase in the
numbers of wanted organisms relative to the other bacteria.
such media are called enrichment media..
eg. tetrathionate broth.
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