gram-negative

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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.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.Gram-negative - (of bacteria) being of or relating to a bacterium that does not retain the violet stain used in Gram's method
bacteria, 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 plants
disconfirming, negative - not indicating the presence of microorganisms or disease or a specific condition; "the HIV test was negative"
Translations

gram-neg·a·tive

n. gram-negativo, resultado de la aplicacion del método de Gram de decoloración de una bacteria o tejido por medio de alcohol.

Gram-negative

adj Gram negativo
References in periodicals archive ?
coli virulence factors include the surface component 'adhesin' and a variety of iron sequestration systems.11 Pathogens of urinary tract include other Gram-negative bacilli such as Klebsiella spp.
Amongst the positive cocci Staphylococcus showed maximum resistance to Cephalosporins (96.9%) followed by AZM (93.9%) and AMC (72.7%).The Gram-negative bacilli showed resistance ranging from 15.7% to 76.5%.
Our results showed that Gram-negative bacilli were least susceptible to amoxicillin-clavulanic acid (2.94.3%).
aeruginosa CAP should be suspected in any patient who has environmental risk factors and has Gram-negative bacilli seen on the Gram stain of the sputum sample, and who presents with pneumonia with overwhelming sepsis.
Among them 38 Gram-Positive Cocci (GPC) and 63 Gram-Negative Bacilli (GNB).
Dokdonella koreensis is a Gram-negative bacilli that was first isolated from the soil and has been reported previously in patients with catheter-related bloodstream infections.
A few gram-negative bacilli were seen in guinea pig tissues, but these were believed to be normal flora or contaminants.
It is concluded that non-fermenting Gram-negative bacilli isolated from different clinical specimens should not be ignored and identified by using standard methods so as to institute appropriate and timely anti-biotic coverage.
Such findings justify the prescription of this antibiotic in infections by gram-negative bacilli. Accordingly, the low bacterial sensitivity to tobramycin was expected, since the majority of the strains isolated here were gram-positive.
For Gram-negative bacilli ampicillin, cefixime, ceftriaxone, cotrimoxazole, ciprofloxacin, ofloxacin, gentamicin, amikacin, amoxicillin-clavulanic acid, cefoperazone-sulbactam, piperacillin-tazobactam, and Imipenem were used.

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