Download Spirillaceae

Spirillaceae
Bacteria:
Spirochaetes
Family :
Spirochaetaceae
Leptospiraceae
Spirillaceae
Species:
Treponema
Borrelia
Leptospira
Spirillum
What is spirillacea?
• rigid spirally curved elongate bacteria
• Spirillaceae is a family of bacteria Spirochaetes
• It has been described as a member of
Nitrosomonadales ,in Betaproteobacteria
Spiral shape
of Spirillaceae
• Domain : Bacteria
• Phylum : Protobacteria
• Class : Betaprotobacteria
• Order : Nitrosomonadales
• Family : Spirillaceae
• Genera : spirillum
Characteristics
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•
•
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Type : Gram negative bacteria
Shape : long, helically coiled (spiral-shaped) cells
Nature : chemoheterotrophic
Lengths : between 5 and 250 µm and diameters
around 0.1-0.6 µm
• Special : Differ from other bacteria by the
location of the flagella / axial fillament which
located between the bacterial inner membrane
and outer membrane in periplasmic space.
Cont’d
• Mobility : Effect of the flagella cause a twisting
motion which allows the spirochaete to move
about.
• Reproduction : a spirochaete will undergo
asexual transverse binary fission.
• Others : Most spirochaetes are free-living
and anaerobic
gram- stained
spirochaetes
Various screw bacteria
a) Borrelia,
b) Treponema,
c) Leptospira
a) Spirillum undulata
b) Spirillum rubrum
c) Spirillum volutans
d) Vibrio cholerae
In studying movement
of bacteria the
student should not
confuse it with
"Brownian
movement", the
trembling of minute
objects when highly
magnified. This is
likely due to a
molecular
bombardment.
Disease
• Spirillum minus and Streptobacillus
moniliformis arespecies of Spirillum.
• Spirillum minus cause rat-bite fever
Rat Bite
Fever ??
illness caused by bacteria transmitted
by rodents, rats, in most cases, which is
passed from rodent to human via the
rodent's urine or mucous secretions.
Effects of Rat-Bite fever
Trouble maker!!