gram-positive


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Related to gram-positive: Gram-positive cocci

gram-positive

 [gram-poz´ĭ-tiv]
retaining the stain or resisting decolorization by alcohol in Gram's method of staining; see Gram stain. This is a primary characteristic of bacteria whose cell wall is composed of peptidoglycan and teichoic acids.

gram-pos·i·tive

(gram-pos'i-tiv), In this expression gram begins with lowercase g but: Gram stain.
Refers to the ability of a type of bacterium to resist decolorization with alcohol after being treated with crystal violet stain, which imparts a violet color to the bacteria when viewed by light microscopy. This reaction is usually an indication that the outer structure of the bacterium consists of a cytoplasmic membrane surrounded by a thick rigid bacterial cell wall composed of peptidoglycan. See: Gram stain.

gram-positive

/gram-pos·i·tive/ (-poz´it-iv) retaining the stain or resisting decolorization by alcohol in Gram's method of staining, a primary characteristic of bacteria whose cell wall is composed of peptidoglycan and teichoic acid.

gram-positive

or

Gram-positive

(grăm′pŏz′ĭ-tĭv)
adj.
Of, relating to, or being a bacterium that retains the violet stain used in the Gram stain method.

gram-positive

Etymology: Hans C.J. Gram; L, positivus
retaining the violet color of the stain used in Gram's method of staining microorganisms. This property is a primary method of characterizing organisms in microbiology. Some of the most common kinds of gram-positive pathogenic bacteria are Bacillus anthracis, Clostridium species, Mycobacterium leprae, Mycobacterium tuberculosis, Staphylococcus aureus, Streptococcus pneumoniae, and Streptococcus pyogenes.

gram-pos·i·tive

(gram-poz'i-tiv)
Refers to the ability of a bacterium to resist decolorization with alcohol after being treated with Gram crystal violet stain, imparting a violet color to the bacterium when viewed by light microscopy.
See: Gram stain

Gram-positive

see GRAM'S STAIN.

Gram-positive

Referring to a bacteria that takes on a purplish-black color when exposed to Gram's stain.
Mentioned in: Aminoglycosides

gram-pos·i·tive

(gram-poz'i-tiv)
Refers to the ability of a type of bacterium to resist decolorization with alcohol after being treated with crystal violet stain, which imparts a violet color to the bacteria when viewed by light microscopy.

gram-positive,

n retaining the violet color of the stain used in Gram's method of staining microorganisms. Staining property is a common method of classifying bacteria. See also Gram's stain.

gram-positive

said of bacteria that resist decolorization by alcohol in Gram's method of staining (see gram's stain) and thus retain the crystal violet-iodine complex and appear purple; a characteristic of bacteria whose cell wall is composed of a thick layer of peptidoglycan and teichoic acid.
References in periodicals archive ?
Caption: An old lab technique for differentiating bacteria as either gram-positive (left) or gram-negative (right) has been incorrectly explained for decades.
Gram-positive rods were identified by Gram's stain in all birds and by aerobic bacterial culture in 86% (18 of 21) (95% CI 72%-100%) of the birds.
The objective of this experiment was to determine the relative effectiveness of the antibiotics ampicillin and kanamycin on Gram-positive and Gram-negative bacteria.
Culture of pus from the umbilical scar grew an unidentified gram-positive bacillus (M124).
Among patients with gram-positive and gram-negative pathogens, 35% of those on linezolid died, vs.
Additional to this Phase III trial, multiple microbiology studies, both in vitro and in vivo, were presented which highlighted the potent in vitro activity of ceftobiprole against clinically relevant Gram-positive pathogens (E-0113, E-0114, C2-1143) including staphylococci recovered from bone and joint infections (E-0119) as well as from patients with endocarditis (E-0118) supporting the potential use of ceftobiprole in those high medical need areas.
The associations between acute endometritis and black-pigmented gram-negative rods, anaerobic gram-positive cocci, and BV remained significant after excluding the 41% of women infected with N.
Acticoat[R], from Smith & Nephew, is a silver-coated antimicrobial dressing that offers broad protection from more than 150 types of wound pathogens, including gram-negative and gram-positive bacteria, fungal organisms, and antibiotic-resistant bacteria such as MRSA and VRE.
Actinomycosis is a chronic suppurative infection of the cervicofacial region caused by Actinomyces species, which are anaerobic, gram-positive filamentous bacteria.
The gram-positive bacteria Streptomyces californicus and Bacillus cereus are known inhabitants of water-damaged buildings, and the gram-negative bacterium Pseudomonas fluorescens is found in many indoor and outdoor environments.

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