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4 September 2019

Morphology of Bacteria- Microbiology notes|ICDS Supervisor Kerala PSC


Morphology of Bacteria- Microbiology notes|ICDS Supervisor Kerala PSC

Morphology of Bacteria- Microbiology
Morphology of Bacteria- Microbiology


Morphology of Bacteria 




Size: 

  • Bacteria come in a great many sizes and several shapes.
  •  Most bacteria range from 0.2 to 2.0 μm in diameter and from 2 to 8 μm in length. (an overall average size of 1 to 10 μm.) 


Shape: 



They have a few basic shapes: 

1. Spherical coccus (plural: cocci, meaning round), 

2. Rod-shaped bacillus (plural: bacilli)
3. Spiral. 

Cocci:

v

 Cocci are usually round but can be oval or elongated. 

When they divide to reproduce, they remain attached to each other.

 Classification According to Plane of Division:

 Diplococci: 

Those Cocci that remain in pairs after dividing are called diplococci.

 Streptococci:

 Those cocci that divide and remain attached in chainlike patterns are called streptococci. 

Tetrad: 

Those cocci that divide into two planes and remain in groups of four are known as tetrads. 

Sarcinae: 

Those cocci that divide in three planes and remain attached in cube like groups of eight are called sarcina.

 Staphylococci: 

Those cocci that divide in multiple planes and form grape like clusters or broad sheets are called staphylococci. 

Bacilli: 

 Bacillus are the rod like bacteria 
e.g. Bacillus anthracis

Single bacillus:
 Most bacilli appear as single rods, called single bacilli. 

Diplobacilli: 

Those bacilli which are appear in pairs after division called Diplobacilli 



Streptobacilli: 

Those bacilli that found in chains in single plane are called Streptobacilli. 

Monomorphic: 

Bacteria that maintain single shape called monomorphic or the bacteria having same shape. 

Pleomorphic: 


Some bacteria can have many shapes known as pleomorphic.

 e.g: Corynebacterium, Pyogenesis. 

-Some bacteria occur in the shape of star e.g. Stella. 
- Some bacteria occur in the shape of rectangle e.g. Haloarcula. 
- Some bacteria also appear triangular in shape.



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