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The oxidase test is a biochemical reaction that assays for the presence of cytochrome oxidase, an enzyme sometimes called indophenol oxidase. In the presence of an organism that contains the cytochrome oxidase enzyme, the reduced colorless reagent becomes an oxidized colored product .
This test also can differentiate between ketone functional groups and water-soluble carbohydrates.
Proteins are polymers of amino acids. They are complex organic compounds containing nitrogen, hydrogen, carbon and oxygen. Proteins are abundant in our everyday food e.g. egg, soya bean, pulses, fish, milk etc. The presence of proteins can be confirmed qualitatively by usign several tests, Xanthoproteic test is one of them. Due to the presence of characteristic side chains in them, certain amino acids exhibit typical color reactions that form the basis for their identification.
The catalase test is a type of biochemical test which is used to detect the production of catalase enzymes in the organism.
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).
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.
Acetoacetic acid and acetone react with an alkaline solution of sodium nitroprusside to form a purple-colored complex. This method can detect above 1-5 mg/dl of acetoacetic acid and 10-20 mg/dl of acetone. Beta-hydroxybutyrate is not detected.
Gerhardt’s test is a type of laboratory test which is performed for the qualitative detection of ketone bodies in urine.
Cross Match is a laboratory test, performed prior to a blood transfusion to determine whether donor blood is compatible (or incompatible) with recipient blood.
Reverse grouping is defined as using the reagent cells with known ABO antigens and testing the patient’s serum for ABO group antibodies.
This stain was discovered by German chemist Gustav Giemsa, that’s why its called Wright Giemsa Stain.
Wright’s stain is a modified Romanowsky stain. In hematology laboratory, it is used for the staining of peripheral blood smear, bone marrow aspirates, and urine samples.
The gelatin proteins derived from the animal connective tissue, collagen. Gelatin is produced when collagen is boiled in water. A gelatin hydrolysis test is used to detects the presence of gelatinases. Gelatinases are extracellularly secreted by some bacteria which hydrolyze or digest gelatin.
In this method, the Group B Streptococcus (CAMP test positive) is streaked in the center of sheep blood agar, and Clostridium perfringens is streaked perpendicular to it.
CAMP Test was first discovered by four researchers Christie, Atkins, Munch, and Peterson in 1944, that’s why this test is also known as Christie–Atkins–Munch-Peterson test.
ACK Lysis Buffer Preparation ACK Lysis Buffer is used to lyse red blood cells. To prepare 1L of ACK Lysis Buffer the following components are required; Component Amount Concentration NH4Cl (mw: 53.49 g/mol) 8.02 g 0.15 M KHCO3 (mw: 100.12 g/mol) 1 g 0.01 M Na2EDTA (mw: 372.24 g/mol) 37 mg 0.0001 M ACK Lysis … Read more
Tyrode’s Solution, Acidic Preparation To prepare 1L of Tyrode’s Solution, Acidic, the following components are required; Component Amount Concentration NaCl (mw: 58.44 g/mol) 8 g 0.1368 M KCl (mw: 74.55 g/mol) 200 mg 0.0027 M CaCl2•2H2O (mw: 147.01 g/mol) 240 mg 0.0016 M MgCl2•6H2O (mw: 203.3 g/mol) 100 mg 0.0005 M Glucose (mw: 180.16 g/mol) … Read more
pH Buffer solution A pH buffer or hydrogen ion buffer is defined as an aqueous solution that is composed of a mixture of a weak acid and its conjugate base, or vice versa. In addition of a small amount of strong acid or base, it shows very little changes in pH. pH buffer is mainly … Read more
Acrylamide Stock Solution Preparation Application: Acrylamide is used along with bisacrylamide to form gels used in SDS-PAGE. Acrylamide forms polyacrylamide polymers, while bisacrylamide crosslinks between polyacrylamide chains. To prepare 1L of Acrylamide Stock Solution the following components are required; Component Amount Concentration acrylamide (mw: 71.08 g/mol) 389.6 g 5.481 M bisacrylamide (mw: 154.17 g/mol) 10.4 … Read more
Chelation Medium Preparation To prepare 1L of Chelation Medium the following components are required. Component Amount Concentration NaCl (mw: 58.44 g/mol) 40.9 g 0.7 M MgCl2·6H2O (mw: 203.3 g/mol) 6.1 g 0.03 M MgSO4·7H2O (mw: 246.47 g/mol) 7.39 g 0.03 M KCl (mw: 74.55 g/mol) 1.49 g 0.02 M EGTA (mw: 380.35 g/mol) 7.6 g … Read more
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