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The
standard
work
for
the
classification
of
bacteria
is
Bergey's
Manual
of
Determinative
Bacteriology. The
eighth
edition
published
in
1974
(Eds.
R.
E.
Buchanan
and
N.
E.
Gibbons)
shows
a
much
modified
organisation
from
the
seventh
edition.
The
seventh
edition
of
the
manual
classifies
bacteria
in
the
form
of
a
complete
hierarchy.
The
eighth
edition
groups
the
bacteria
into19
sections
on
the
basis
of
structure,
genetic
data
and
biochemical,
nutritional,
staining
and
ecological
characteristics.
This
change
in
approach
in
the
identification
and
classification
of
bacteria
is
due
to
the
application
of
three
sets
of
experimental
observational
approaches
(I)
light
microscopic
observations
and
staining
methods
have
been
employed
to
observe
the
behaviour
of
the
nucleus
(2)
The
electron
microscope
has
been
used
to
extend
the
study
of
Comparative
cytology
to
the
ultra
structural
level
of
the
ceIl
(3)
Biochemical
and
biophysical
techniques
have
been
employed
to
further
clarify
the
features
of
cellular
organisation..
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