Selective toxicity is the important characteristic of antimicrobial drugs which means that any drug is selective against a particular microorganism and also selectively act on a particular site. Not all drugs can act on every site. There are many sites at which any drug acts such as cell wall, cell […]

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Bacteria can be classified into two different categories i.e. gram-positive bacteria and gram-negative bacteria. To differentiate the type of bacteria present in any collected sample there is a technique known as GRAM STAINING OR GRAM STAIN. It is sometimes also known as gram’s method. This technique is a different step […]

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WHAT IS A VIRUS?????A virus is referred as an infectious agent that can only replicate inside the living cells of an organism i.e. a virus is something which can not at all grow or replicate by its own. It always needs a living cell for its replication process. It is […]

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