In this article we will discuss about the growth curve of bacteriophage. One-step growth curve, developed by Max Delbriick and Emory Ellis (1939), marks the starting of modern bacteriophage research. In this experiment, susceptible bacterium (E. coli) is mixed with bacteriophage (T2) and is allowed for a short period to get attached with the host cells. The culture is then [...]
In this article we will discuss about the replication of virus by lytic and lysogenic cycle. Replication of Virus by Lytic Cycle: This type of cycle is seen in T-even phages (T2, T4 etc.) which attack Escherichia coli. The lytic cycle consists of five steps (Fig. 2.45): (a) Adsorption, (b) Infection (Fig. 2.44), (c) Synthesis of phage components in host [...]
In this article we will discuss about:- 1. Definition of Viruses 2. Size of Viruses 3. Shape 4. Classification 5. Types. Definition of Viruses: Virus (L. poison) is a nucleoprotein entity which is able to utilize the synthetic machinery of a living cell of another organism for its multiplication which does not involve growth and division. Even before its discovery [...]