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 translocation and transmission of virus. Translocation of Virus: Viruses move from one cell to the neighbouring plant cell through plasmodesmata. During movement, they multiply in most cells. Initially they infect parenchyma cells where they multiply and then pass in the neighbouring cells. In leaf parenchyma cells, the virus moves approximately 1 mm [...]
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 [...]