Gram method

noun
a staining technique used to classify bacteria; bacteria are stained with gentian violet and then treated with Gram's solution; after being decolorized with alcohol and treated with safranine and washed in water, those that retain the gentian violet are Gram-positive and those that do not retain it are Gram-negative
Hypernyms: ↑staining

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noun

Useful english dictionary. 2012.

Look at other dictionaries:

  • Gram method — Gram stain an empirical staining procedure in which microorganisms are stained with crystal violet, treated with 1:15 dilution of strong iodine solution, decolorized with ethanol or ethanol acetone, and counterstained with a contrasting dye,… …   Medical dictionary

  • Gram method — see Stains and Staining Methods, under stain …   Medical dictionary

  • Gram method stain solution — (gram) [Hans Christian Joachim Gram, Danish physician, 1853–1938] see Stains and Staining Methods, under stain, and see gram negative and gram positive …   Medical dictionary

  • Gram-negative — bacteria lose the crystal violet stain (and take the color of the red counterstain) in Gram s method of staining. This is characteristic of bacteria that have a cell wall composed of a thin layer of a particular substance (called peptidoglycan).… …   Medical dictionary

  • Gram-positive — bacteria retain the color of the crystal violet stain in the Gram stain. This is characteristic of bacteria that have a cell wall composed of a thick layer of a particular substance (called peptidologlycan). The Gram positive bacteria include… …   Medical dictionary

  • Gram's method — n. Biol. a method of differentiating bacteria by staining with a dye, then attempting to remove the dye with a solvent, for purposes of identification. Phrases and idioms: Gram positive (or negative) (of bacteria) that do (or do not) retain the… …   Useful english dictionary

  • Gram stain — noun a staining technique used to classify bacteria; bacteria are stained with gentian violet and then treated with Gram s solution; after being decolorized with alcohol and treated with safranine and washed in water, those that retain the… …   Useful english dictionary

  • Gram's stain — noun a staining technique used to classify bacteria; bacteria are stained with gentian violet and then treated with Gram s solution; after being decolorized with alcohol and treated with safranine and washed in water, those that retain the… …   Useful english dictionary

  • Gram's procedure — noun a staining technique used to classify bacteria; bacteria are stained with gentian violet and then treated with Gram s solution; after being decolorized with alcohol and treated with safranine and washed in water, those that retain the… …   Useful english dictionary

  • Gram staining — (or Gram s method) is an empirical method of differentiating bacterial species into two large groups (Gram positive and Gram negative) based on the chemical and physical properties of their cell walls.cite book | last = Bergey | first = David H.… …   Wikipedia

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