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 ultrasensitive silver protein stain also detect nanograms of nucleic acids.
To remove rose petals from the bath tub, spray a cleaning agent on the stain, let it sit for a few minutes then scrub if off with a cleaning brush.
In other words, the stains are on the enamel surface of the tooth, which is the first anatomical layer of the tooth.
The use of Auramine-O stain is recommended because of its increased sensitivity and ease of interpretation compared with the ZN method.
Unlike spring and summer, fall presents homeowners with the perfect climate conditions to stain their decks.
The positive result for the presence of AFB was confirmed using ZN technique which includes strong carbol fuschin as primary stain, 20% sulphuric acid as decolorizer and 0.1% methylene blue as counter stain (7).
This present study is aimed at comparing the commonly used metachromatic stains viz., Wright-Giemsa, Toluidine blue, Methylene blue and Papanicolaou stain in the assessment of cell types of the oestrous cycle in rats.
For red wine, sprinkle salt on the affected area to absorb as much of the stain as possible.
Unlike traditional stain products, there is no brushing required--easy sp-rayon application allows homeowners to spend less time applying and more time enjoying their outdoor living space.
If the stain is oil-based, you may need to use a dry cleaning solvent.
The results for effect of concentration of stain (ug/mL) in working solution on staining score (1-5) of intact (green), partially fragmented (yellow-orange) and completely fragmented (red) DNA of sperm, are presented in Table I.