Microbiology

Chlamydia

Chlamydia considers as the obligate parasites and sometimes refers as “Large viruses”. These are true bacteria and differ from the virus by many ways. Like bacteria, chlamydia also possesses both DNA and RNA. These multiply by binary fission, whereas viruses never do so. Chlamydia possesses bacterial cell type incorporated with peptidoglycan probably containing mumaric acid. …

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Difference Between Selective and Differential Media

The difference between selective and differential media is mainly due to the following factors: Intended use of the media: The purpose of both selective and differential media differs. A selective media only permits the development of particular organisms, while a differential media discerns one species of the organism from the other growing on the similar …

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MacConkey Agar Media

MacConkey agar media was first introduced by a scientist named Alfred Theodore MacConkey in the year 1890s. It is primarily exercised for the isolation and differentiation of the non-fastidious, gram-negative bacilli belonging to the family Enterobacteriaceae. Previously, it was first considered as “Solid differential media”. But now, it is practised as both liquid broth and …

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Pinocytosis

Pinocytosis is a kind of endocytic process. It can define as the cellular mechanism where the bilayer cell membrane invaginates to form a sac to uptake the extracellular fluids and solutes into the cytoplasm. Pinocytosis is a spontaneous endocytic process which occurs in almost all the cells. It is prevalent in eukaryotes. It also refers …

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Phagocytosis

Phagocytosis is a method of endocytosis. It can define as the cellular mechanism where the vesicles form by the invagination of the plasma membrane and cause internalization of the extracellular contents into the cell. Internalization is a process where a plasma membrane undergoes successive invagination to form membrane-bound vesicles that later detach from the cell …

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Exocytosis

Exocytosis is a means of membrane transportation that expels the intracellular material out of the cell. The transport of the substance is mediated by the vesicles that eliminate the cell debris and releases specific proteins, enzymes, hormones etc. outside the cell. It is a type of active transport mechanism that makes the use of ATP. …

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Difference Between Cell Wall and Cell Membrane

Difference between the cell wall and the cell membrane is primarily due to the differences in three factors like composition, function and permeability. Composition: The composition of cell wall mainly comprises of proteins and carbohydrates, whereas a cell or plasma membrane comprises of lipids, proteins and some amount of carbohydrate. Function: The functional role of …

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Motility Test

Motility test can consider as the biochemical or microscopic examination of an organism to check the existence of cellular-motility. By performing this test, one can differentiate between the two major groups of bacteria, namely motile and non-motile, based on their cellular movement. Few organisms are motile, whereas few are non-motile, but all the living organisms …

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Vermicomposting

Vermicomposting is one of the types of composting technique, which turns the organic debris into a humus-like product, by the use of earthworms. The compost produced by this method refers as “Vermicompost”.  The vermicompost can merely define as earthworm’s excrement, which provides essential nutrients, aeration, porosity, structure, fertility and water-holding capacity to the soil and …

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Bile Solubility Test

Bile solubility test is a biochemical test that distinguishes bile soluble and bile resistant α-haemolytic streptococci. Streptococcus pneumoniae is the only strain that emulsifies on reaction with bile solubility reagent, while the other α-haemolytic streptococci do not undergo such reaction. The reason for the dissolution of the Streptococcus pneumoniae is due to the presence of …

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