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Gram staining

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  • 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

  • Gram staining — A technique to distinguish between two major bacterial groups, based on whether or not their cell wall retains the Gram stain. Gram positive bacteria are stained dark purple, while Gram negative bacteria are only faintly coloured. Stain retention …   Glossary of Biotechnology

  • Gram staining — noun Grams method of distinguishing the two main groups of bacteria …   Wiktionary

  • Staining — is an auxiliary technique used in microscopy to enhance contrast in the microscopic image.In biochemistry it involves adding a class specific (DNA, proteins, lipids, carbohydrates) dye to a substrate to qualify or quantify the presence of a… …   Wikipedia

  • Gram-positive bacteria — Gram positive bacteria, stained purple, of both the bacillus (“rod shaped”) and coccus (spherical) forms.  A few Gram negative bacteria are also present, stained pink.  Numbered ticks are eleven (11) microns apart. Gram positive… …   Wikipedia

  • 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 (disambiguation) — Gram is a unit of measurement of mass. Otherwise, gram may refer to: gram, the Greek based suffix meaning drawing or representation. Contents 1 Places 2 People …   Wikipedia

  • Gram-negative bacteria — Microscopic image of Gram negative Pseudomonas aeruginosa bacteria (pink red rods). Gram negative bacteria are bacteria that do not retain crystal violet dye in the Gram staining protocol.[1] In a Gram …   Wikipedia

  • Gram stain — The Danish bacteriologist J.M.C. Gram (1853 1938) devised a method of staining bacteria using a dye called crystal (gentian) violet. Gram s method helps distinguish between different types of bacteria. The gram staining characteristics of… …   Medical dictionary

  • Gram's method — noun a staining technique, using a sequence of crystal violet, iodine and safranine, used to differentiate bacteria into two large groups of species Syn: Gram staining …   Wiktionary