In this article we will discuss about nutrition and growth in bacteria. Nutrition in Bacteria: Bacteria are devoid of chlorophyll and they perform heterotrophic mode of nutrition. However, there is a small group of bacteria which are autotrophic: 1. Autotrophic Bacteria: They can synthesise carbohydrate .food from CO2 like that of chlorophyll containing plants. They are of two types: Photosynthetic [...]
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 cell structure of bacteria with the help of diagrams. A bacterial cell (Fig. 2.5) shows a typical prokaryotic structure. The cytoplasm is enclosed by three layers, the outermost slime or capsule, the middle cell wall and inner cell membrane. The major cytoplasmic contents are nucleoid, plasmid, ribosome, mesosome etc., and the cell [...]