Different types of Bacterial Colony and their characteristics.pptx

Description of various types of bacterial colonies along with their characteristic morphology for identification.

1. Colony characteristics Dr R. Ralte Assoc. Professor Dept of Vety Microbiology KCVAS, Amritsar

2. Odor:  Odor according to the its smell, it’s among the following types: Sweetish Aromatic Fishy Seminal Others Consistency/texture  – Texture and consistency of the living thing is described by: Moist Dry Viscid – stick to loop Mucoid – mucus like

3. Opacity  – refers to the characteristics of the colony, such as: Transparent Translucent Opaque Iridescent - Shiny Pigmentation : Certain bacteria produce pigments. They are of the following kinds: Golden yellow (Staphylococcus aureus) Lemmon yellow (Micrococcus luteus) Prodigiosin( pink/red/ magenata ): e.g. Serratia marcescens Pyocanin (bluish-green) e.g. Pseudomonas aeruginosa Pyoverdin /fluorescein (greenish-yellow) e.g. Pseudomonas aeruginosa Pyomelanin (brown to black pigment) e.g. Pseudomonas aeruginosa Pyorubin (red) e.g. Pseudomonas aeruginosa

4. Circular, glistening, and yellow Irregular,, glistening, and white Rhizoid, veined, rough, and yellow Filamentous, rough, and white

5. Sinorhizobium meliloti Escherichia coli Pseudomonas aeruginosa Pasteurella multocida Staphylococcus aureus Streptococcus pyogenes

6. Staphylococcus aureus : large opaque, round, creamy, white to yellowish colonies displaying beta- hemolysis on blood agar Streptococcus pyogenes : small translucent colonies displaying beta- hemolysis on blood agar Streptococcus pneumoniae: small colonies with raised edges displaying alpha- hemolysis on blood agar,

7. Proteus sp : swarming behaviour on blood agar Serratia marcescens: red pigmentation: although considered characteristic of the species, only about 10% of specimens produce this pigment, Bacillus cereus: “ground-glass” colonies displaying beta- hemolysis on blood agar,

8. Factor affecting colony morphology of bacteria