metachromatic granules
(met\'ah-kro-mat\'ik)
Granules of polyphosphate in the cytoplasm of some bacteria that appear a different color when stained with a blue basic dye. They are storage reservoirs for phosphate. Sometimes called volutin granules.

Microbiology. . 2009.

Look at other dictionaries:

  • metachromatic — adjective Date: 1876 1. staining or characterized by staining in a different color or shade from what is typical < metachromatic granules in a bacterium > 2. having the capacity to stain different elements of a cell or tissue in different colors… …   New Collegiate Dictionary

  • metachromatic — Denoting cells or dyes that exhibit metachromasia. SYN: metachromophil, metachromophile. * * * meta·chro·mat·ic krō mat ik adj 1) staining or characterized by staining in a different color or shade from what is typical <metachromatic… …   Medical dictionary

  • metachromatic granule — 1. a granular cell inclusion that stains a color different from that of the dye used. 2. in certain bacteria, yeasts, yeastlike fungi, and protozoa, granules that appear red when stained with a blue dye, composed of complex polyphosphate, lipid,… …   Medical dictionary

  • volutin granules — (vo lu tin) See metachromatic granules …   Dictionary of microbiology

  • Babes-Ernst granules — Metachromatic intracellular deposits of polyphosphate found in Corynebacterium diphtheriae when the bacteria are grown on suboptimal media. Stain reddish with methylene blue or toluidine blue …   Dictionary of molecular biology

  • volutin granule — Metachromatic granules containing polyphosphate, a linear phosphate polymer found in bacteria, fungi, algae, and some higher eukaryotes that may serve as a stock of phosphate …   Dictionary of molecular biology

  • stain — 1. To discolor. 2. To color; to dye. 3. A discoloration. 4. A dye used in histologic and bacteriologic technique. 5. A procedure in which a dye or combination of dyes and reagents is used to color the constituents of cells and tissues. For… …   Medical dictionary

  • Babes-Ernst granule — Ba·bes Ernst granule bäb .esh ərn(t)st n a metachromatic granule in protoplasm called also Babes Ernst body Babès Victor (1854 1926) Romanian bacteriologist. In 1888 Babès made two important discoveries. With the German pathologist Paul Ernst he… …   Medical dictionary

  • granule — 1. A grainlike particle; a granulation; a minute discrete mass. 2. A very small pill, usually gelatin or sugar coated, containing a drug to be given in a small dose. 3. A colony of the bacterium or …   Medical dictionary

  • leukocyte — A type of cell formed in the myelopoietic, lymphoid, and reticular portions of the reticuloendothelial system in various parts of the body, and normally present in those sites and in the circulating blood (rarely in other tissues). Under various… …   Medical dictionary

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