In this article we will discuss about the classification of pili. Mainly pili are of two types: (a) Common pili which act to adhere the cell to surfaces, and (b) Sex pili which join the other bacterial cell for transfer of genome. Ottow (1975) has classified the pili into the following six groups: Group 1: Fimbriae of this group act [...]
In this article we will discuss about the Chargaff-equivalence rule for DNA. By 1948, a chemist Erwin Chargaff started using paper chromatography to analyse the base composition of DNA from a number of studies. In 1950, Chargaff discovered that in the DNA of different types of organisms the total amount of purines is equal to the total amount of pyrimidines [...]
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 [...]