In this article we will discuss about:- 1. Process of Lysogeny 2. Control of Lysogeny 3. Induction 4. Lysogenic Conversion 5. The Genetic Switch 6. Significance. Process of Lysogeny: Many bacteriophages (bacterial viruses) such as phage T2, T4, etc. that reproduce within host bacterial cells using a lytic cycle and finally destroy the cell are called virulent bacteriophages. But, there [...]
In this article we will discuss about:- 1. Discovery of Cyanophages 2. Morphology of Cyanophages 3. Replication. Discovery of Cyanophages: Cyanophages are the phages (Fig. 13.14) that attack cyanobacteria. Cyanophages were first discovered by Safferman and Morris (1963) from a waste stabilization pond of Indiana University (USA). The first cyanophage studied by Safferman and Morris was the cyanophage attacking Lyngbya, [...]
In this article we will discuss about the classification of bacteriophage. 1. Bacteriophages with DNA Genome: A. Genome is double-stranded DNA, generally linear. 1. Family Myoviridae: Icosahedral, isometric or elongated head with a helical rigid tail containing a contractile sheath, tail plate, tail fibres and spikes. Example: E. coli phage (coliphage) T2, T4, T6. 2. Family Styloviridae: Icosahedral, isometric head [...]