Selective
media
Selective
media contain
specific
chemicals
which
do
not
affect
the
growth
of
the
bacterium
to
be
isolated
but
discourage
the
growth
of
other
bacteria
in
the
mixture.
For
example,
addition
of
sodium
azide
at
specific
concentration
into
media
selectively
isolates
lactic
acid
bacterium.
There
are
many
other
selective
agents
used
as
dyes
(for
brucellas),
cetrimide
(for
Pseudomonas
aeruginosa),
tetrazolium
(for
halophytic
bacteria),
bile
salts,
antibiotics
etc.
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