| 释义 |
gram-negative
gram-neg·a·tive or Gram-neg·a·tive (grăm′nĕg′ə-tĭv)adj. Of, relating to, or being a bacterium that does not retain the violet stain used in the Gram stain method.Gram-negative adj (Microbiology) designating bacteria that fail to retain the violet stain in Gram's method Gram′-neg′ative (græm)
adj. (often l.c.) (of bacteria) not retaining the violet dye when stained by Gram's method. [1905–10] gram-negative Relating to a group of bacteria that generally are resistant to the effects of antibiotics or the actions of the body's immune cells. Gram-negative bacteria have relatively thin cell walls and, when subjected to a specialized laboratory staining method, do not change color. Compare gram-positive.Thesaurus| Adj. | 1. | Gram-negative - (of bacteria) being of or relating to a bacterium that does not retain the violet stain used in Gram's methodbacteria, bacterium - (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plantsdisconfirming, negative - not indicating the presence of microorganisms or disease or a specific condition; "the HIV test was negative" |
Translationsgram-negative
gram-negative[′gram¦neg·əd·iv] (microbiology) Of bacteria, decolorizing and staining with the counterstain when treated with Gram's stain. gram-negative
gram-negative [gram-neg´ah-tiv] losing the stain or decolorized by alcohol in Gram's method of staining; see stain" >Gram stain. This is a primary characteristic of bacteria having a cell wall composed of a thin layer of peptidoglycan covered by an outer membrane of lipoprotein and lipopolysaccharide.gram-neg·a·tive (gram-neg'ă-tiv), In this expression gram begins with lowercase g but Gram stain takes an uppercase G.Refers to the inability of a type of bacterium to resist decolorization with alcohol after being treated with crystal violet. However, following decolorization, these bacteria can be readily counterstained with safranin, imparting a pink or red color to them when viewed by light microscopy. This reaction is usually an indication that the outer structure of the bacterium consists of a cytoplasmic (inner) membrane surrounded by a relatively thin peptidoglycan layer, which in turn is surrounded by an outer membrane. See: Gram stain. gram-negative or Gram-negative (grăm′nĕg′ə-tĭv)adj. Of, relating to, or being a bacterium that does not retain the violet stain used in the Gram stain method.gram-neg·a·tive (gram-neg'ă-tiv) Refers to the inability of a bacterium to resist decolorization with alcohol after being treated with Gram crystal violet. However, following decolorization, these bacteria can be readily counterstained with safranin, imparting a pink or red color to the bacterium when viewed by light microscopy.
See: Gram stainGram-negative see GRAM'S STAIN.Gram-negativeRefers to the property of many bacteria that causes them to not take up color with Gram's stain, a method which is used to identify bacteria. Gram-positive bacteria which take up the stain turn purple, while Gram-negative bacteria which do not take up the stain turn red.Mentioned in: Aminoglycosides, Campylobacteriosis, Helicobacteriosis, Hemophilus Infectionsgram-neg·a·tive (gram-neg'ă-tiv) Refers to the inability of a type of bacterium to resist decolorization with alcohol after being treated with crystal violet. AcronymsSeeGNGram-negative
Related to Gram-negative: gram-positive, gram-negative folliculitisWords related to Gram-negativeadj (of bacteria) being of or relating to a bacterium that does not retain the violet stain used in Gram's methodRelated Words- bacteria
- bacterium
- disconfirming
- negative
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