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.
References in periodicals archive ?
Our data suggest that the bactericidal action of imidazoles such as isoconazole nitrate on gram-positive bacteria is based on the accumulation of reactive oxygen species, said Dr.
Gram stain procedure that Gram-positive bacteria have a thicker peptidoglycan cell wall than Gram-negative bacteria.
This new crystal structure puts us in a unique position to target multi-drug-resistant Gram-positive bacteria like MRSA, VRE and PRSP that cause life-threatening infections.
Gram-negative bacteria were the predominant cause prior to 1987; gram-positive bacteria predominated in subsequent years.
Dennis Stevens, chief of infectious diseases at the Veterans Affairs Medical Center, Boise, Idaho, said that although Zyvox is an "excellent" drug for treating resistant or sensitive gram-positive bacteria, he hopes it will be used mainly in hospitals to treat known antibiotic-resistant gram-positive infections or in cases where there is "a high index of suspicion" that a patient has an infection with a resistant organism.
coli are more readily killed and lysed by lactoperoxidase than gram-positive bacteria.
and many other non-US markets as therapy for Staphylococcus aureus bloodstream infections (bacteremia), including right-sided endocarditis, caused by methicillin-resistant Staphylococcus aureus (MRSA) and methicillin-susceptible Staphylococcus aureus (MSSA), and complicated skin infections caused by certain Gram-positive bacteria, including MRSA.
Among specific topics are regulating virulence by iron in gram-positive bacteria, uropathogenic Escherichia coli virulence and gene regulation, anthrax and iron, the regulation of vesicle formation, and regulation in response to host-derived signaling molecules.
Enterococcus faecalis - A common cause of nosocomial infection, this gram-positive bacteria can cause endocarditis, urinary tract infections, and meningitis.
Till date, doctors lacked the basic insight to prevent and cure these diseases caused by the so-called Gram-positive bacteria.
Palmitoleic acid may be useful in topical formulations for treatment of secondary gram-positive bacterial infections, as a gram-positive bacteria antimicrobial in wound dressings, and as a natural gram-positive antimicrobial preservative in skin and hair care products.
The chapter on the role of sortases on surface expression of surface proteins among gram-positive bacteria is comprehensive and well written.

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