gram-positive

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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.
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