In this article we will discuss about Rickettsiae:- 1. Cultivation of Rickettsiae 2. Animal Inoculation of Rickettsiae 3. Laboratory Diagnosis 4. Resistance. Cultivation of Rickettsiae: All rickettsiae cannot be grown on cell free media, except R. Quintana which will grow on blood agar medium. They can be cultivated in yolk sac of chick embryo, grow on mouse fibroblast, HeLa, Hep2 [...]
In this article we will discuss about Bacteriophage:- 1. Introduction to Bacteriophage 2. Morphology of Bacteriophage 3. Life Cycle 4. Significance. Introduction to Bacteriophage: Bacteriophage (Greek phagein—to eat; bacteriophage, bacteria-cater) are viruses that infect and parasitise bacteria. They cause lysis of bacteria. They are abbreviated as phages. Twart (1915) and d'Herelle (1917) observed an invisible minute parasite of bacteria that [...]
The following points highlight the two main parts of virus particles according to Bawden and Pirie. The parts are: 1. Nucleoid 2. Capsid. Virus Particle: Part # 1. Nucleoid: It is present within the protein coat (Fig. 1). Each virus particle has only one type of nucleic acid either RNA or DNA. The viruses containing DNA are called Deoxyviruses and [...]