Functions of capsule:
1) protect from phagocytosis, the lytic action of complements and the damage of antimicrobial agents.
2) promote adherence to other bacteria or to host tissue surface
3) form biofilm
flagellum
functions
1) Motility
2) Antigenicity (H–Ag)
3) Associated with pathogenicity
4) Differentiation for B
pilus
spore
function:
high resistance
Physiology of Bacteria (Physicochemical Properties of Bacteria)
3 Physiology of Bacteria
一、Chemical composition of B
water inorganic salts
carbohydrates proteins
lipids nucleic acids
二、physical properties of B
optical property
surface area
charged phenomenon(negative)
semi-permeability
osmotic pressure
4 Nutrition & Growth of B
一 Types of Nutrition
二 Adequate nutrients
三 Nutrient transportation of B
Condition for B growth and
multiplication
1. Right and sufficient nutrients
2. pH
3. Temperature
4. Aeration
5. Osmotic pressure
Growth and Multiplication of Bacteria
(一) Growth and multiplication of
Individual
1. binary fission
2. 20-30 min / Generation
(二) Growth and multiplication of bacterial population
1. lag phase: 1~4 h growth curve
2. logarithmic phase: 8~18h
3. stationary phase
4. decline phase
(一) Liquid medium or broth
(二) Solid agar medium
(三) Semi–solid agar medium
Usage of Bacterial culture
1.Diagnosis,prevention and treatment of infectious diseases
2.Characterization of B
3.Preparation of vaccine toxoid and other biologic products
4.Application in industry and agriculture
5.Uses for genetic engineering
6 Morphological identification and Cultivation of B
一、 Morphological Identification
Non-staining
Staining
Gram stain
Acid – fast stain