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Purple bacteria
Purple bacteria
or
purple photosynthetic bacteria
are
proteobacteria
that are
phototrophic
, that is, capable of producing energy through
photosynthesis
. They are pigmented with
bacteriochlorophyll
a
or
b
, together with various
carotenoids
, which give them colours ranging between purple, red, brown, and orange. They may be divided into two groups –
purple sulfur bacteria
and
purple non-sulfur bacteria
(
Rhodospirillaceae
).
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