Colony counter is an instrument used in microbiology laboratory for counting microbial colonies grown on agar plate. It is used for bacteria, yeast, fungi and other microorganisms. It counts the number of Colony Forming Units (CFU) present on the plate. Each colony is considered as formed from one viable microbial cell or group of cells. … Read more
Two pan analytical balance is a classical weighing instrument used for measuring mass of an object. It is also called equal arm analytical balance because both arms of the beam are equal in length. It works on the principle of first class lever. The beam is supported at the centre on a sharp knife-edge. This … Read more
Single pan mechanical balance is a precise weighing instrument used for measuring mass of a sample. It is also called unequal arm mechanical balance because the two arms of the beam are not equal in length. It works on the law of moments or lever principle. The balance has a horizontal beam which rests on … Read more
Triple beam balance is a mechanical instrument used for measuring the mass of an object. It does not need electricity. So it can be used in ordinary laboratory and classroom. It measures mass, not weight. So the reading is not changed by local gravity like weight. The mass is measured by balancing the object with … Read more
Analytical balance is a sensitive laboratory instrument used for measuring very small mass with high accuracy. It is commonly used in chemistry, biology, pharmaceutical and research laboratory. It can measure mass up to 0.1 mg or 0.01 mg level. So it is used when accurate weighing of sample is needed. Small change in air, dust … Read more
Reversed-Phase Chromatography (RPC) is a type of liquid chromatography used for separation and analysis of compounds. It separates molecules mainly according to their hydrophobic nature. In this method the stationary phase is non-polar. The stationary phase is usually silica gel attached with hydrophobic alkyl chains. Common phases are C18 and C8. The mobile phase is … Read more
Liquid Chromatography is a separation technique used to separate, identify and measure the components of a liquid mixture. It is used in analytical chemistry for the analysis of complex samples. In this technique, the sample is passed through a column with the help of a liquid solvent. The liquid solvent is called mobile phase. The … Read more
Hydrophobic Interaction Chromatography (HIC) is a chromatographic technique used for separation and purification of proteins, peptides, enzymes and monoclonal antibodies. It separates molecules according to their surface hydrophobic nature. In this method the stationary phase has hydrophobic groups attached to it. These groups may be phenyl, butyl, octyl or other alkyl groups. These groups bind … Read more
Flash chromatography is a rapid preparative chromatographic technique used for separation and purification of mixture of organic compounds. It separates compounds mainly on the basis of their polarity and their different interaction with stationary phase and mobile phase. It is a modified form of column chromatography. In normal column chromatography, the solvent moves slowly by … Read more
Two-Dimensional Immunoelectrophoresis is a technique used for the analysis and quantitation of mixture of proteins or antigens in a complex sample. It is also called Crossed Immunoelectrophoresis (CIE). It is mostly used for serum, tissue extract, microbial homogenate and other biological sample. In this technique the separation is done in two directions. In the first … Read more
