Parasporal Crystal Stain – Principle, Procedure, Result
Production of parasporal crystals is a unique ability (among Bacillus species) of Bacillus thuringiensis. This stain is a means of rapid identification of the species.
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Western Blot – Steps, Principle, Result, Applications
In molecular biology Western blotting is a rapid and sensitive assay for detection and characterization of proteins. This technique exploits the inherent specificity of antigen-antibody interaction to identify specific antigens by polyclonal or monoclonal antibodies.
Widal Test – Principle, Procedure, Result, Advantages, Limitation
The Widal test is an agglutination test that determines any antibodies present in the patient’s serum that are generated against the causal agents of the enteric febrile illness (Salmonella Typhi, and Salmonella paratyphi B, A as well as C).
Counter Current Immunoelectrophoresis – Principle, Procedure, Result.
Counter current immunoelectrophoresis is a modification of immunoelectrophoresis in which antigen and antibody migrate towards opposite directions and form a visible white precipitate in the area between the wells.
Rocket Immunoelectrophoresis – Definition, Principle, Procedure, Result, Application
Rocket Immunoelectrophoresis (RIEP) also known as electro-immuno diffusion is a simple, quick and reproducible method for determining the concentration of antigen (Ag) in an unknown sample.
Coagulase Test – Principle, Procedure, Application, Result.
It is a type of biochemical test, which is used to differentiate Staphylococcus aureus from coagulase-negative staphylococci. S.aureus produces two forms of coagulase (i.e., bound coagulase and free coagulase).
Spread Plate Method – Procedure, Principle, Purpose, Result.
Spread Plate Method in microbiology The spread plate method is used to isolate individual colonies from a diluted sample of mix population. Different methods have been developed for the isolation of microorganisms from a mixture sample but among them Spread plate culture method is the most widely used technique in laboratory. An ideal spread plate … Read more
Pour Plate Method – Principle, Procedure, Objective, Result, Advantages
The pour Plate Method technique was created in the laboratory by Robert Koch and is still widely used in the laboratory since his time. This technique is appropriate for Microaerophilic, facultative, or anaerobic microorganisms. It is straightforward to use, requires fewer resources, and is simple and cost-effective. However, it requires the specimen to be placed … Read more
Nitrate Reduction Test – Procedure, Principle, Result
What is Nitrate Reduction Test? Purpose of Nitrate Reduction Test Principle of Nitrate Reduction Test Reactions of Nitrate Reduction Test Use of Zinc powder Use of A Durham tube Requirements Composition of Nitrate broth (medium) Ingredients Gms / Litre Peptic digest of animal tissue 5.000 Meat extract 3.000 Potassium nitrate 1.000 Sodium chloride 30.000 Final … Read more
Restriction Digest – Protocol, Principle, result
The restriction enzymes cleave the DNA molecule at a specific site or specific nucleotide sequence, is known as recognition sequences or Restriction sites.