Symbiotic associations with different groups of microorganisms are discussed below: (i) Cyanobacterial Symbiosis: The term cyanobacteria is of recent origin which includes the members of cyanophyceae. They may be both heterocystous and non-heterocystous forms. Heterocyst is the site of nitrogen fixation. The non-heterocystous forms also fix nitrogen. Anabaena cycadae is associated with the coralloid roots of Cycas. It is present [...]
In this article we will discuss about the evolution of genomes in microorganisms. The prokaryotes contain a large single, circular dsDNA molecule, usually less than 5 Mb long. In addition, they may also contain plasmids. The genome is arranged into operons. A typical prokaryotic genome contains a small amount of non-coding DNA distributed throughout the sequence. For example, E.coli contains [...]
In this article we will discuss about the meaning and types of culture medium used for microorganisms. Meaning of Culture Medium: A culture medium is a solid or liquid preparation of nutrient or combination of nutrients used to grow, transport, and store microorganisms. Much of the study of microbiology depends on the ability to grow and maintain microorganisms in the [...]