In this article we will discuss about the definition and locomotion of Flagella. Definition of Flagella: The motile bacterium may possess a flagellum (plural flagella). The flagellum is hair like helical and surface appendages emerging from the cell wall. It is of 20-30 nm in diameter and 15 µm long. It provides various types of motility to the bacterial cell. [...]
The structure of bacterial flagella have been described by Simon (1978), Doestsch and Sjoblad (1980) and Ferris and Beveridge (1985). A flagellum consists of three basic parts, the basal body, hook and filament (Fig. 4.3). (a) Basal body: M. L. De Pamphilis and J. Alder (1971) isolated the basal body of a flagellum of E. coli and B. subtilis and [...]
In this article we will discuss about the morphology of microbial cell. Size and Shape of Microbial Cell: The size, shape and arrangement of microbial cells vary with species to which they belong. Bacteria are of about 0.1 to 60 × 6 µm in size. However, there is variation in dimension of bacilli (5 × 0.4-0.7 µm), pseudomonads (0.4-0.7 µm [...]