stain

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stain

a dye or similar reagent, used to colour specimens for microscopic study

Stain (microbiology)

Any colored, organic compound, usually called dye, used to stain tissues, cells, cell components, or cell contents. The dye may be natural or synthetic. The object stained is called the substrate. The small size and transparency of microorganisms make them difficult to see even with the aid of a high-power microscope. Staining facilitates the observation of a substrate by introducing differences in optical density or in light absorption between the substrate and its surround or between different parts of the same substrate. In electron microscopy, and sometimes in light microscopy (as in the silver impregnation technique of staining flagella or capsules), staining is accomplished by depositing on the substrate ultraphotoscopic particles of a metal such as chromium or gold (the so-called shadowing process); or staining is done by treating the substrate with solutions of metallic compounds such as uranyl acetate or phosphotungstic acid. Stains may be classified according to their molecular structure. They may also be classified according to their chemical behavior into acid, basic, neutral, and indifferent. This classification is of more practical value to the biologist. See Medical bacteriology

Stain

A coloring liquid or dye for application to any porous material, most often wood; thinner than paint and readily absorbed by the wood so that the texture and grain of the wood is enhanced, and not concealed.

stain

[stān]
(materials)
A nonprotective coloring matter used on wood surfaces; imparts color without obscuring the wood grains.
Any colored, organic compound used to stain tissues, cells, cell components, cell contents, or other biological substrates for microscopic examination.

stain

1. A discoloration in the surface of wood, plastic, sealant, etc.
2. A colorant for enhancing wood grain during finishing.
References in periodicals archive ?
The most popular cell-permeant nucleic acid stains are DAPI and Hoechst dyes, such as Hoechst 33342 and Hoechst 33258.
ChemTone Acid Stain provides you with a beautiful, marble-like finish.
Acid stains come in a set of basic earth tones that can be formulated to produce a range of shades.
They can be used to form more variegated appearances than solvent-based acid stains.
The color palette with these products is also much broader than that available with acid stains because the color depends on the pigment formulation and not the composition of the concrete.
The Los Alamos group has used several different nucleic acid stains, including PicoGreen, POPO-3, and TOTO-1, all of which show a 600-fold or larger enhancement in fluorescence when they bind to DNA.