Supriya N

Methyl Red Test

Methyl red test differentiates whether a test organism can undergo mixed acid fermentation or not by allocating adequate glucose. Organisms that can ferment glucose will give a positive MR test by producing a large amount of acid, while some organisms give a negative MR test. MR-test also helps to identifying and categorizing the different genera of …

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Indole Test

Indole test is a biochemical test determining and classifying the bacteria based on their tendency to decompose amino acid (Tryptophan) into a heterocyclic organic compound (Indole). It is a part of a biochemical method popularly known as the IMViC test, in which ‘I’ stands for the indole test. Indole is one of the end products …

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Bacterial Conjugation

Bacterial conjugation is a gene transfer mechanism introduced by the scientists named Lederberg and Tatum in 1946. The conjugation method was first studied in Escherichia coli. The formation of a conjugation tube is the characteristic feature of a conjugation mechanism. Besides transduction and transformation mechanisms, some bacteria passes the genetic information from a donor to …

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Mitotic Division

Mitotic division shows a pattern of cell division, where a single cell multiplies into two similar daughter cells by the segregation of newly replicated chromosomes in the nucleus. It is the intermediate phase of the cell division that activates after the G-2 interphase and ends with cytokinesis. Mitosis is a part of the M-phase cell …

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Centrifugation Method

The centrifugation method separates different components or the suspended particles from the homogenous solution through centrifugal force. A natural gravitational force can also concentrate particles but in an indefinite time. To increase particle separation efficiency, a centrifugal force function to separate particles by sedimentation property. It separates particles based on their physical properties like size, …

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Mendelian Inheritance

Mendelian inheritance is an approach that explains the traits or characters inherit from one generation to another by the discrete units or genes. “Mendelism” or  Mendelian inheritance was introduced by the Austrian monk Gregor Johann Mendel. Sir Mendel has honoured as “Father of Genetics” for his great efforts to explain the theory of inheritance that …

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SOS Repair

SOS repair or “bypass” or “Emergency” repair is one of the DNA repair mechanisms introduced in 1975 by a scientist named Miroslav Radman. SOS repair primarily recovers the DNA damage caused due to environmental stresses. It serves as a regulatory system, which comprises many complex inducer proteins that repair the damaged DNA. SOS system also …

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