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