gram-positive

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Related to Gram positive bacteria: Gram negative bacteria

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 ?
In completed pre-clinical studies BB-83698 has shown high potency against a range of gram positive bacteria, including several drug-resistant strains.
Quorex Pharmaceuticals has demonstrated that its proprietary compounds dramatically inhibit virulence factor production in both Gram negative and Gram positive bacteria and in drug resistant strains of bacteria, in vitro.
OTC BB:NUTX) has developed the proprietary BaCCine(TM) Lactococcus lactis BT5100 that is designed to reduce the ability of food poisoning gram positive bacteria, like Listeria monocytogenes, to grow and cause infection.