differential stain


Also found in: Dictionary, Thesaurus, Legal, Encyclopedia, Wikipedia.
Related to differential stain: special stain

stain

 [stān]
1. a substance used to impart color to tissues or cells, to facilitate microscopic study and identification.
2. an area of discoloration of the skin.
acid-fast stain a staining procedure for demonstrating acid-fast microorganisms.
differential stain one that facilitates differentiation of various elements in a specimen.
endogenous stain an intrinsic stain acquired during tooth development.
exogenous stain an intrinsic stain acquired after a tooth has erupted.
extrinsic stain a stain that can be removed from a tooth surface by polishing.
Giemsa stain a solution containing azure II-eosin, azure II-glycerin, and methanol; used for staining protozoan parasites such as Plasmodium and Trypanosoma, for Chlamydia, for differential staining of blood smears, and for viral inclusion bodies. Stained elements appear pink to purple to blue.
Gram stain a staining procedure in which bacteria are stained with crystal violet, treated with strong iodine solution, decolorized with ethanol or ethanol-acetone, and counterstained with a contrasting dye; those retaining the stain are called gram-positive, and those losing the stain but staining with the counterstain are called gram-negative.
hematoxylin and eosin stain a mixture of hematoxylin in distilled water and aqueous eosin solution, employed universally for routine examination of tissues.
intrinsic stain a stain that is within the enamel of a tooth and cannot be removed by polishing.
metachromatic stain one that produces in certain elements a color different from that of the stain itself.
nuclear stain one that selectively stains cell nuclei, generally a basic stain.
port-wine stain a persistent dark red to purple nevus flammeus that grows proportionately with the affected child and is usually found on the face. Initially it is macular, but the surface may develop angiomatous overgrowths with time. Port-wine stains often occur in association with other congenital abnormalities.
supravital stain a stain introduced in living tissue or cells that have been removed from the body.
tumor stain an area of increased density in a radiograph, due to collection of contrast material in distorted and abnormal vessels, prominent in the capillary and venous phases of arteriography, and presumed to indicate neoplasm.
vital stain a stain introduced into the living organism, and taken up selectively by various tissue or cellular elements.
Wright's stain a mixture of eosin and methylene blue, used for demonstrating blood cells and malarial parasites.

con·trast stain

a dye used to color one portion of a tissue or cell that remained unaffected when the other part was stained by a dye of different color.
Synonym(s): differential stain

differential stain

In bacteriology, a stain such as Gram stain that enables one to distinguish different types of bacteria.
See also: stain

stain

1. a substance used to impart color to tissues or cells, to facilitate microscopic study and identification.
2. an area of discoloration of the skin.

acid stain
a stain in which the coloring agent is in the acid radical.
basic stain
a stain in which the coloring agent is in the basic radical.
carbol fuschin stain
used to stain some gram-negative bacteria, including Campylobacter fetus.
Castaneda's stain
a technique for demonstrating chlamydial elementary bodies, using formol blue and safranine.
Diene's stain
one containing methylene blue, maltose and azure II, used for staining mycoplasmal microcolonies.
differential stain
one which facilitates differentiation of various elements in a specimen.
hematoxylin and eosin stain
a staining method employed universally for routine histological examination of tissue sections.
India ink stain
used to demonstrate capsules on Cryptococcus neoformans and some bacterial species.
lambing stain
staining of the breech and back of the udder of a ewe caused by the passage of the fetal fluids and then the lochia. Used as a guide to whether or not the ewe has lambed and perhaps lost her lamb.
Macchiavello stain
a basic fuscin solution for staining chlamydial elementary bodies.
metachromatic stain
one that produces in certain elements color different from that of the stain itself.
methanamine silver stain
stains fungal elements in tissue a dark brown.
new methylene blue stain
a metachromatic dye used for staining blood, vaginal smears, and tissue samples for cytological examination. Particularly useful in demonstrating reticulocytes.
Newman's stain
used on smears of milk for demonstrating organisms in mastitis.
nigrosin stain
an aniline dye used in wet mounts to demonstrate capsules, especially with cryptococcusneoformans.
nuclear stain
one that selectively stains cell nuclei, generally a basic stain.
ophthalmic stain
used in the diagnosis of diseases of the eye, e.g. fluorescein and rose bengal dyes.
supravital stain
a stain introduced in living tissue or cells that have been removed from the body.
tumor stain
an area of increased density in a radiograph, due to collection of contrast material in distorted and abnormal vessels, prominent in the capillary and venous phases of arteriography, and presumed to indicate neoplasm.
vital stain
a stain introduced into the living organism, and taken up selectively by various tissue or cellular elements. Often used to determine the live/dead cell ratio in a cell population.
Wright's stain
a mixture of eosin and methylene blue, used for demonstrating blood cells.
Ziehl-Neelsen stain
one of carbol fuchsin counterstained with methylene blue; used to demonstrate acid-fast organisms, especially Mycobacterium spp., in smears and tissues. A modified method using mild acid to decolorize is used for staining Brucella spp. and Nocardia asteroides. See also acid-fast.
Full browser ?