Download - Factors influencing growth of Microorganism
Colonization: Repeating microcolonies [ bacterial cells multiplication biomass ]
Factors essential for growth of microorganisms
Requirement of anaerobic and aerobic environment Temperature. pH. Nutrient source.
Intrageneric : same species of bacteria
Intergeneric : different species of bacteria
NOTE :
factors can help bacterial adherence
Bacterial factors-Capsule and slime layer .
-Pili or Fimbriae-Lipotechoic acid-Cell wall protein.
- Glucans polymers are used byS mutans to adhere on teeth surface.
Salivary constituents
Glycoprotein and calciumions in human saliva play a role in aggregation of streptococci
Factors inhibiting bacterial adherence
1 -Host factors-Lysozymes Lactoperoxidase-
-Lactoferrin
Salivary factors Mechanical washing -Buffering capacity (pH6.7) -Salivary S-IgA-
Bacterial factors.-Bacterial enzymes as proteinase.
-Organic acids.-Hydrogen peroxide -Bacteriocins
Homotypic adherence : is attachment of the same type of bacterial cells
Heterotypic adherence: is attachment of different types of bacterial cells
DONE BY:
GHADEER HASSAN