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 ?
Blot the stain with cold water and mild detergent, then rinse.
With this background, this study was aimed to assess the utility of Leishman stain for diagnosis of HD.
The PPG Timeless Stain transparent product lineup delivers advanced penetrating oil technology that works its way deep into the wood to beautify and protect from the inside out.
For other stains, like foundation or lipstick, or even sweat stains, simply pour enough detergent to cover the stain and spread the detergent with the pre-treat cap.
The objective of this study was to detect and confirm the presence of acid fast bacilli in lymph node biopsies using routine Ziehl Neelsen stain, Kinyoun stain and fluorescence staining and also to determine the best, rapid and more cost effective technique of staining for the detection of acid fast bacilli.
The right product applied the wrong way can only make the stain worse.
Five slides prepare for each stain of different concentration.
I find alcohol or spirit stains helpful when I want greater penetration of the stain and a darker or stronger stain effect.
Three smear was stained by routine Ziehl-Neelsen method and other by fluorescence stain Auramine-Rhodamine and PAP (Papanicolaou) stain.
Sugar soap will shift nicotine stains TEN years ago I had a concrete drive laid and had Qterracotta colour integrated into the concrete.
Dyes are typically used when the look of an acid-based stain is desired, but a water-based nonreactive product is preferred, because it can be difficult to create a variegated, highly translucent appearance with the nonreactive acrylic stains.