The following points highlight the top six ways by which cell division occurs in bacteria. (a) The circular double stranded DNA molecule (nucleus) during replication gets separated into two strands of DNA and form new complimentary strand resulting in two identical double stranded DNA molecules, which are distributed into two daughter cells (Fig. 1). (b) A transverse septun grows across [...]
Principles of Genetic Recombination (With Diagram)! Principle # 1. Transformation: In this process only a limited amount of DNA is transferred from one strain of bacterium into the other in solution. It was first observed by Griffith (1928) in Pneumococcus pneumoniae (then called Diplococcus). Evidence for this was obtained in the following experiment by him: The Pneumococcus bacteria has both [...]
In this article we will discuss about the physical, chemical and physiochemical techniques of sterilization in bacteria. Physical Methods of Sterilization: (i) Sun-Light: Ultraviolet rays present in the sun-light are responsible for spontaneous sterilization in natural conditions. In tropical countries the sun light is more effective in killing bacteria due to combination of ultraviolet rays and heat. By killing bacteria [...]