Technology
Analytical and separative procedures in which molecules, particularly proteins or nucleic acids, are separated by their different electrophoretic mobilities in a hydrated gel. The gel suppresses convective mixing of the fluid phase through which the electrophoresis takes place and contributes molecular sieving. For proteins, commonly carried out in the presence of the anionic detergent sodium dodecylsulphate (SDS). SDS denatures proteins so that noncovalently associating sub unit polypeptides migrate independently and by binding to the proteins confers a net negative charge roughly proportional to the chain weight.
Diagnostic Methods
Technology
A method for amplifying a DNA base sequence using multiple rounds of heat denaturation of the DNA and annealing of oligonucleotide primers complementary to flanking regions in the presence of a heat-stable polymerase. This results in duplication of the targeted DNA region. Newly synthesized DNA strands can subsequently serve as additional templates for the same primer sequences, so that successive rounds of primer annealing, strand elongation, and dissociation produce rapid and highly specific amplification of the desired sequence. PCR also can be used to detect the existence of the defined sequence in a DNA sample.
Diagnostic Methods
Technology
An electroanalytical technique in which the electrical potential of a solution is measured to determine the composition of the sample, by comparing the constant potential of the reference electrode with the actual potential of the indicator electrode.
Diagnostic Methods
Company
Promega Corporation is an IVD supplier based in United States, with a source-linked product portfolio. Molecular Diagnostics. Coverage spans Molecular Assays, Instruments | Gastrointestinal.
Manufacturer
Technology
The process of determining the sequence of amino acids within a protein molecule.
Diagnostic Methods
Technology
Pulsed-field gel electrophoresis (PFGE) is a method used to separate proteins or high molecular weight linear DNA fragments that are greater than 50 kilobases (kb) in size. Fragments are separated by pulsing an electrical field across an agarose gel rather than applying the constant field used in conventional electrophoresis.
Diagnostic Methods
Technology
A DNA sequencing method that uses a "sequencing by synthesis" strategy. The strand complementary to a template is synthesized a single base at a time through the sequential addition of individual solutions of each base. Incorporation of a base into the growing strand generates free pyrophosphate that is detected as light, as generated by a luciferase-catalyzed reaction.
Diagnostic Methods
Company
QIAGEN N.V. is an IVD supplier based in Germany, with a source-linked product portfolio. Molecular Assays. Coverage spans Molecular Assays | qPCR | STI, Respiratory.
Manufacturer
Technology
Quantitative PCR: a method to measure very small amounts of RNA transcripts as cDNA targets. There are two strategies currently used, one is called Competitive RTPCR and the other is called Real-Time PCR.
Diagnostic Methods
Company
QuidelOrtho Corporation is an IVD supplier based in United States, with a source-linked product portfolio. Molecular Assays. Coverage spans Molecular Assays | qPCR | STI.
Manufacturer
Technology
A quantitative technique used to detect and estimate the concentration of an antigen by measuring the diameter of the ring of precipitation (precipitin ring), which is formed as a result of the interaction of the antigen and an antibody at optimal concentration.
Diagnostic Methods
Technology
Radioimmunoassay (RIA) is an immunological technique, which quantitatively determines antigen and antibody concentrations, using a radioactively labeled substance (radioligand), either directly or indirectly.
Diagnostic Methods
