Microorganisms
Classification
Based
on
Oxyen
Requirements -
Although
oxygen
is
found
as
a
cellular
component,
most
organisms
Need
molecular
oxygen
for
respiration.
In
these
organisms,
oxygen
serves
as
the
terminal
electron
acceptor
and
such
organisms
are
referred
to
as "obligate
aerobes",
Example.
Nitrobacter.
As
opposed
to
this,
there
are
organisms
which
do
not
use
molecular
oxygen
as
terminal
electron
acceptor
although
oxygen
is
a
component
of
their
cellular
material.
In
fact,
molecular
oxygen
is
toxic
to
these
organisms
and
these
are,
called
as "obligate
anaerobes",
e.g.
clostridia.
In
these
organisms
nitrate,
sulphate
or
organic
compounds
serve
as
electron
acceptors
Index >> Growth of Microorganism >> Microorganisms Classification Based on Oxyen Requirements
Some
microorganisms
can
also
grow
either
in
the
presence
or
absence
of
molecular
oxygen
and
these
are
termed
as
facultative
anaerobes,
e.g.
E.
coli.
Some,
of
these
have
a
fermentative
energy
yielding
metabolism
but
are
not
sensitive
to
the
presence
of
molecular
oxygen,
while
others
can
shift
from
a
respiratory
to
a,
fermentative
metabolism
depending
upon
the
presence
or
absence
of
oxygen. |
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