2. CLASSIFICATION
BACTERIA
On the Basis of Shape
On the Basis of Staining
On the Basis of Action
On the Basis of Oxygen Requirement
On the Basis of pH
On the Basis of Temperature
On the Basis of Structure
On the Basis of Osmotic Pressure
OF
3. ON THE BASIS OF SHAPE
Cocci
(a) Dipplococci e.g Neisseria Gonorrhorea
(b) Streptococci e.g S.mutans
(c) Sarcina e.g Sarcina rosea
(d) Tetrad e.g Micrococcus luteus
(e) Staphylococci e.g Staphylococcus aureus..
Baccilli
(a) Dipplobacilli e.g Clostridium
(b) Coccobacilli e.g Bordtella pertusis
Vibrio e.g Vibrio cholerae
Spiral e.g Spirillus
Spirochete e.g Treponema pallidum
4. ON THE BASIS OF STAINING
Gram
positive e.g Streptococci aureus
Gram negative e.g Neisseria Gonorrhorea
ON THE BASIS OF TEMPERATURE
Psychrophiles e.g Bacillus psychrophilus
Psychrotrophs e.g Listeria monocytogenes
Mesophiles e.g E.coli
Thermophiles e.g Bacillus
stearothermophiles
Hyperthermophiles
e.g Sulpholobus
5. ON THE BASIS OF STRUCTURE
Spore
former
(a) Centre spore former e.g Bacillus careus
(b) Terminal spore former e.g Clostridium tetani
(c) Subterminal spore former e.g Clostridium
subterminal
Capsule
former
e.g Bacillus anthracis
Flagella
(a) Monotrichous e.g Pseudomona auregenosa
(b) Amphitrichous e.g
(c) Lophotrichous e.g Pseudomona flouresence
(d) Peritrichous e.g Salmonella typhi
(e) Atrichous e.g spirochas
6. ON THE BASIS OF O2 REQUIREMENT
Obligate
aerobes e.g Pseudomonas mycobacterium
Facultative anaerobes e.g E.coli
Aerotolerant anaerobes e.g streptococcus
pyrogene
Obligate
anaerobes e.g Clostridium bacteriodes
Microaerophiles e.g Campylobacter
ON THE BASIS OF pH
Acidophiles
e.g Sulpholobus
Neutrophiles
Alkalophiles
e.g Escherichia
e.g Bacillus alkalophiles
ON THE BASIS OF OSMOTIC PRESSURE
Osmotolerant
Halophiles
e.g S.aureus
e.g Helicobacter pylori
