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An assay (analysis) is never an isolated process, as it must be accompanied with pre- and post-analytic procedures. Both the communication order (the request to perform an assay plus related information) and the handling of the specimen itself (the collecting, documenting, transporting, and processing done before beginning the assay) are pre-analytic steps.
On the wet basis the value is the ratio of the weight of water to the total weight of the solution (1 / 5 = 20% in the example), so the moisture content is always below 100% (in the previous examples the moisture content was specified on this "moisture content wet basis"). For the moisture content dry basis the ratio of the weight of the water ...
Atlantic horseshoe crab Limulus polyphemus. Limulus amebocyte lysate (LAL) is an aqueous extract of motile blood cells from the Atlantic horseshoe crab Limulus polyphemus.LAL reacts with bacterial endotoxins such as lipopolysaccharides (LPS), which are components of the bacterial capsule, the outermost membrane of cell envelope of gram-negative bacteria.
If the measured response is binary, the assay is quantal; if not, it is quantitative. [3] A bioassay may be used to detect biological hazards or to give an assessment of the quality of a mixture. [4] A bioassay is often used to monitor water quality as well as wastewater discharges and its impact on the surroundings. [5]
Before the age of theoretical and computational chemistry, wet chemistry was the predominant form of scientific discovery in the chemical field. This is why it is sometimes referred to as classic chemistry or classical chemistry. Scientists would continuously develop techniques to improve the accuracy of wet chemistry.
A microtiter plate after an MTT assay. Increasing amounts of cells resulted in increased purple colouring. The MTT assay is a colorimetric assay for assessing cell metabolic activity. [1] [2] NAD(P)H-dependent cellular oxidoreductase enzymes may, under defined conditions, reflect the number of viable cells present.
It is less perturbative because the sample is not dried onto a surface, this drying process is often done in negative-stain TEM, and because Cryo-EM does not require contrast agent like heavy metal salts (e.g. uranyl acetate or phoshotungstic acid) which also may affect the structure of the biomolecule. Transmission electron microscopy, as a ...
Polyacrylamide gel electrophoresis (PAGE) is a technique widely used in biochemistry, forensic chemistry, genetics, molecular biology and biotechnology to separate biological macromolecules, usually proteins or nucleic acids, according to their electrophoretic mobility. Electrophoretic mobility is a function of the length, conformation, and ...