Essay On Bacterial Growth

1379 Words6 Pages
BACTERIAL GROWTH Growth of Bacteria is the orderly increase of all the chemical constituents of the bacteria. Multiplication is the result of growth. Death of bacteria is the irreversible loss of ability to reproduce. Bacteria are composed of carbohydrates , proteins, water, lipids and trace elements. Factors effect on bacterial Growth : (1) Environmental factors affecting growth, and (2) Sources of metabolic energy. Classification of Bacteria 1-According to shape: Bacteria are generally classified by many methods. The simplest and oldest method is by shape. The four principal categories are:  Bacilli (singular: Bacillus), rod-shaped bacteria; the most numerous of all types. They include coccobacilli and streptobacilli.  Cocci (singular: Coccus), spherical bacteria. This group is divided into bacteria that occur in pairs, such as the diplococci; in clusters, such as the staphylococci; and in chains, such as the streptococci.  Spirilla (singular: Spirillum), spiral-shaped bacteria; the least numerous type.  the vibrios (S-shaped or comma-shaped bacteria). The other methods of…show more content…
It is ideally spatially unstructured and temporally structured. The bacterial culture is incubated in a closed vessel with a single batch of medium. In some experimental regimes, some of the bacterial culture is periodically removed and added to fresh sterile medium. In the extreme case, this leads to the continual renewal of the nutrients. This is a chemostat, also known as continuous culture. It is ideally spatially unstructured and temporally unstructured, in a steady state defined by the rates of nutrient supply and bacterial growth. In comparison to batch culture, bacteria are maintained in exponential growth phase, and the growth rate of the bacteria is known. Related devices include turbidostats and
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