In this article we will discuss about the bacteriophage typing of various serotypes. 1. Bacteriophage Typing of S. typhi: This is done by determining the sensitivity of the culture to a series of variants of a single phage, Vi-phage II, which have been adapted to the different types of typhoid bacillus. In 1938, Craigie and Yen developed the first Vi-phage-typing [...]
In this article we will discuss about:- 1. Morphology of Phage Lambda 2. DNA and Gene Organization of Phage Lambda 3. Life Cycles of Phage Lambda 4. Genetic Map of Phage Lambda 5. Choice between Lytic and Lysogenic Cycles. Morphology of Phage Lambda: Morphological structure of phage λ is given in Fig. 18.11A. The head has 20 faces. A 20- [...]
In this article we will discuss about the morphology and multiplication of T-Even phages. The dsDNA tailed phages of Caudovirales account for 95% of all the phages reported. Phages are classified by the International Committee on Taxonomy of Viruses (ICTV) according to morphology and nucleic acid as given in Table 18.1. There are three even-numbered T-phages (e.g. T2, T4 and [...]