metachromasia


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metachromasia

 [met″ah-kro-ma´zhah]
1. failure to stain true with a given stain.
2. the different coloration of different tissues produced by the same stain.
3. change of color produced by staining. adj., adj metachromat´ic.

met·a·chro·ma·si·a

(met'ă-krō-mā'zē-ă),
1. The condition in which a cell or tissue component takes on a color different from the dye solution with which it is stained. Synonym(s): metachromatism (2)
2. A change in the characteristic color of certain basic thiazine dyes, such as toluidine blue, when the dye molecules are bound in proximate array to tissue polyanionic polymers, such as glycosaminoglycans.
[meta- + G. chrōma, color]

metachromasia

/meta·chro·ma·sia/ (-kro-ma´zhah)
1. failure to stain true with a given stain.
2. the different coloration of different tissues produced by the same stain.
3. change of color produced by staining.

metachromasia

[-krōmā′zhē·ə]
Etymology: Gk, meta, beyond, chroma, color
a tissue-staining phenomenon in which cells being examined acquire a color other than that of the dye used. Cartilage cells, for example, may appear red after being stained with a blue dye. The cause is an interaction between the dye molecules and the acidic radicals of the tissue cells. Also called metachromism.

metachromasia

The property of a tissue, due to the presence of sulfated polysaccharides and sialic acid mucins, which causes it to stain differently from the surrounding structures and from the colours used in the dye.

met·a·chro·ma·si·a

(met'ă-krō-mā'zē-ă)
1. The condition in which a cell or tissue component takes on a color different from the dye solution with which it is stained.
Synonym(s): metachromatism (2) .
2. A change in the characteristic color of certain basic thiazine dyes, such as toluidine blue, when the dye molecules are bound to tissue polyanionic polymers.
[meta- + G. chrōma, color]

metachromasia

The variations in colour produced in different parts of a tissue when stained with a single dye.

metachromasia

1. failure to stain true with a given stain.
2. the different coloration of different tissues produced by the same stain.
3. change of color produced by staining.
References in periodicals archive ?
This finding shows that other specific factors beyond polymer charge density, such as sulfate groups, are required for metachromasia in the presence of DMB.
One concludes that malathion has a direct cytotoxic effect causing coiling of the tail, with increase of metachromasia of the chromatin of the spermatozoa and altering the sperm count.
For observations of general morphology (with a light microscope) and for studies of metachromasia, cells were fixed in 10% formalin in FSW and stained with 1:5000 methylene blue.
The electrophoretic profile also showed similar mobility of both polysulfated on gel, in which M I exhibited a single band; therefore, it was a homogeneous crude SPs extract in charge density than that obtained from the M II which revealed a polydisperse crude SPs extract and weak metachromasia, suggesting a low sulfate content in the sample (RODRIGUES et al.
l]), corroborating thus its metachromasia, when verified by electrophoresis (Figure 3).
All fractions indicated a relatively low carbohydrate concentration, but with the highest metachromasia verified for fraction eluted with 1.