In this article we will discuss about the four main phases of growth curve in bacteria. The phases are: 1. Lag Phase 2. Log Phase or Exponential Phase 3. Stationary Phase 4. Decline Phase. 1. Lag Phase: After inoculation into the sterile nutrient medium, the bacterium first undergoes a period of acclimatisation. At that time, necessary enzymes and intermediate [...]
In this article we will discuss about the harmful and useful activities of bacteria. Harmful Activities: Some bacteria are harmful to human affairs in different ways: a. Pathogenic Bacteria: These bacteria cause great losses to plant and animal population by causing several diseases. Some important bacterial diseases of plants and animals, including human beings is given below (Table 2.6-2.8 and [...]
The following points highlight the five methods by which reproduction in bacteria takes place. The methods are: 1. Binary Fission 2. Conidia 3. Budding 4. Cysts 5. Endospore. Method # 1. Binary Fission: In binary fission, single cell divides into two equal cells (Fig. 2.19). Initially the bacterial cell reaches a critical mass in its structure and cellular constituents. [...]