sheath bacteria and endospore-forming rods and cocci

1. SHEATH BACTERIA AND ENDOSPORE
FORMING RODS AND COCCI
SUBMITTED TO: SUBMITTED BY:
Dr. Neha Batra Aparajita Sharma
MSc Biotech
Sem 1

2. Sheathed Protobacteria
• Sheathed bacteria are
filamentous Betaproteobacteria
in which flagellated swarmer cells
form within a long tube or
sheath.
• Common in freshwater habitats,
rich in organic matter such as
polluted streams; typically found
in flowing water.
• In habitats in which reduced iron
or manganese is present, the
sheaths may become coated with
with ferric hydroxide or
manganese oxide.

3. • Two major genera:
Sphaerotilus and Leptothrix.
Sphaerotilus natans:
• chain of rod shaped cells
enclosed in a sheath.
• The cells within the sheath
divide by binary fission; new
cells pushed out at the end
synthesize new sheath
material.

6. Leptothrix:
Leptothrix bacteria are
known to be capable of
oxidizing both iron(II) and
manganese(II),unlike
other sheathed bacteria.

7. Endospore forming bacteria
• A number of gram-positive bacteria can
form a special resistant, dormant structure
called an endospore.
• Clostridium (rods), Sporosarcina (cocci).
• Extraordinarily resistant to heat, UV
radiation, gamma radiation, chemical
disinfectants, dessication.

10. THANK YOU