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 [...]
The following components of deoxyribonucleotide (DNA) have been described: 1. A Five Carbon Ring 2. Nitrogenous Base 3. A Phosphate Group. 1. A Five Carbon Ring: Deoxyribose is a pentose sugar consisting of five carbon atoms. The first and fourth carbon atoms of this sugar combine with one oxygen atom and form a ring. The fifth atom (5') forms –CH2 [...]
In this article we will discuss about the meaning and functions of capsule. Meaning of Capsule: Some of the bacterial cells are surrounded by the extracellular polymeric substances (EPS) which are commonly called capsule or glycocalyx. It forms an envelope around the cell wall and can be observed under light microscope after special staining technique (Fig.4.2). The presence of capsule [...]