gram-negative bacterium
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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-negative — adjective (of bacteria) being of or relating to a bacterium that does not retain the violet stain used in Gram s method • Similar to: ↑negative, ↑disconfirming • Topics: ↑bacteria, ↑bacterium … Useful english dictionary
gram-negative — adjective (of a bacterium) that is not stained violet by Grams method Ant: gram positive … Wiktionary
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-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 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
Bacterium — A single celled microorganism which can exist either as an independent (free living) organism or as a parasite (dependent upon another organism for life). Examples include: {{}}Acidophilus, a normal inhabitant of yogurt, Chlamydia, which causes… … Medical dictionary
bacterium — noun (plural bacteria) Etymology: New Latin, from Greek baktērion staff Date: circa 1849 any of a domain (Bacteria) of prokaryotic round, spiral, or rod shaped single celled microorganisms that may lack cell walls or are gram positive or gram… … New Collegiate Dictionary
gram-positive — adjective (of a bacterium) that is stained violet by Grams method Ant: gram negative … Wiktionary
water bacterium — a gram negative bacterium capable of rapid growth in all types of water and producing pyrogenic infections, especially in immunocompromised hospital patients, occurring as a contaminant in hemodialysis fluids and in flood waters. The most common… … Medical dictionary
