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Methodologies used for the isolation, identification, detection, and quantitation of chemical substances.

The use of engineered small molecules to manipulate the activity of specific cells within living organisms, typically. Chemogenetic techniques are of…

The use of statistical and mathematical methods to analyze chemical observations and phenomena, such as epidemiological analysis of spectroscopically…

A plain radiographic examination of the chest used to evaluate lungs, pleura, heart size, and thoracic structures.

An imaging test of the BILIARY TRACT in which a contrast dye (RADIOPAQUE MEDIA) is injected into the BILE DUCT and x-ray pictures are taken.

Fiberoptic endoscopy designed for duodenal observation and cannulation of VATER'S AMPULLA, in order to visualize the pancreatic and biliary duct syst…

Non-invasive diagnostic technique for visualizing the PANCREATIC DUCTS and BILE DUCTS without the use of injected CONTRAST MEDIA or x-ray. MRI scans …

Radiography of the gallbladder after ingestion of a contrast medium.

A method for diagnosis of fetal diseases by sampling the cells of the placental chorionic villi for DNA analysis, presence of bacteria, concentration…

A technique for identifying specific DNA sequences that are bound, in vivo, to proteins of interest. It involves formaldehyde fixation of CHROMATIN t…

A technique for identifying the BINDING SITES on nucleic acid sequences that are associated with binding proteins.

Techniques used to separate mixtures of substances based on differences in the relative affinities of the substances for mobile and stationary phases…

A chromatographic technique that utilizes the ability of biological molecules, often ANTIBODIES, to bind to certain ligands specifically and reversib…

A method of gel filtration chromatography using agarose, the non-ionic component of agar, for the separation of compounds with molecular weights up t…

A type of ion exchange chromatography using diethylaminoethyl cellulose (DEAE-CELLULOSE) as a positively charged resin. (From McGraw-Hill Dictionary …

Fractionation of a vaporized sample as a consequence of partition between a mobile gaseous phase and a stationary phase held in a column. Two types a…

Chromatography on non-ionic gels without regard to the mechanism of solute discrimination.

Liquid chromatographic techniques which feature high inlet pressures, high sensitivity, and high speed.

Separation technique in which the stationary phase consists of ion exchange resins. The resins contain loosely held small ions that easily exchange p…

Chromatographic techniques in which the mobile phase is a liquid.

A hybrid separation technique combining both chromatographic and electrophoretic separation principles. While the method was invented to separate neu…

An analytical technique for resolution of a chemical mixture into its component compounds. Compounds are separated on an adsorbent paper (stationary …

A chromatography technique in which the stationary phase is composed of a non-polar substance with a polar mobile phase, in contrast to normal-phase …

A CHROMATOGRAPHY method using supercritical fluid, usually carbon dioxide under very high pressure (around 73 atmospheres or 1070 psi at room tempera…

Chromatography on thin layers of adsorbents rather than in columns. The adsorbent can be alumina, silica gel, silicates, charcoals, or cellulose. (Mc…

A technique for causing a targeted loss of molecular function from REACTIVE OXYGEN SPECIES that are formed by the illumination of dyes placed in the …

Staining of bands, or chromosome segments, allowing the precise identification of individual chromosomes or parts of chromosomes. Applications includ…

Any method used for determining the location of and relative distances between genes on a chromosome.

A technique for visualizing CHROMOSOME ABERRATIONS using fluorescently labeled DNA probes which are hybridized to chromosomal DNA. Multiple fluorochr…

The shortest duration of an electrical stimulus where the threshold amplitude is twice the rheobase - the minimum required for eliciting an ACTION PO…