nutrient agar

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Related to nutrient agar: blood agar, MacConkey agar

nu·tri·ent a·gar

a simple solid medium containing beef extract, peptone, agar, and water; used for growing many common heterotrophic bacteria.


a dried hydrophilic, colloidal substance extracted from various species of red algae. When suspended in a liquid medium and heated to 212°F (100°C), the agar dissolves. When it is allowed to cool to 110°F (43°C) the medium becomes a solid gel. It is used in culture media for bacteria and other microorganisms, in making emulsions, and as a supporting medium for immunodiffusion and immunoelectrophoresis. Because of its bulk it is also used in medicines to promote peristalsis and relieve constipation.

birdseed agar
one containing Guizotia abyssinicia (Niger) seed and creatinine, used for growing Cryptococcus neoformans. Called also Niger agar.
bismuth sulfite agar
a special preparation used for isolation of salmonellae from food.
blood agar
a culture medium used for the growth of bacteria. Consists of agar and intact erythrocytes.
brain heart infusion agar
used for cultivating the yeast phase of dimorphic fungi.
brilliant green agar
used to cultivate salmonellae.
chocolate agar
an enriched agar for the growth of Hemophilus, some Actinobacillus, and Taylorella spp. A molten agar and blood mixture is held at 122°F (50°C) prior to pouring plates. The additional nutrients supplied are hemin and NAD.
agar diffusion test
see antimicrobial sensitivity test.
eosin-methylene blue (EMB) agar
used for the identification of Eschericha coli.
agar gel immunodiffusion test
see immunodiffusion tests.
MacConkey agar
contains bile salts, lactose and neutral red indicator for isolation of enterobacteria.
mannitol salt agar
selective for staphylococci.
milk agar
contains skim milk and used to demonstrate casein digestion.
Niger seed agar
see birdseed agar (above).
nutrient agar
the basic growth medium for bacteria, composed of beef extract and peptone.
potato dextrose agar
used in cultivating fungi; promotes sporulation and pigmentation.
Sabouraud's dextrose agar
one used for isolation of fungi. See also dermatophyte test medium.
agar sausage
see medium sausage.
xylose lysine (XLD) agar
used to differentiate Enterbacteriaceae.
References in periodicals archive ?
Samples were then washed with sterilized normal saline and bacterial count was determined by inoculating the samples on nutrient agar.
Nutrient agar medium used for strain cultivation consisted of: Peptone -5 g/L, Yeast extract -3 g/L, Sodium chloride -5 g/L, Glucose -1 g/L, Agar -18 g/, distilled water- 1000 ml and pH was adjusted to 7.
Nutrient agar medium was used to culture the suspect spoilage bacteria.
Growth in nutrient agar reveled translucent granular colonies, gram staining of transparent colonies reveled gram positive pleiomorphic rods with irregular arrangements (Fig.
Similarly water (50 L) and swab samples were also spread on nutrient agar plates.
Effect of pH on bacterial growth was tested on both nutrient agar medium and nutrient broth.
Isolates grown overnight on Nutrient Agar and were resuspended in normal saline to get inoculums with density equivalent to 0.
These bacteria were grown on nutrient agar plate and one distinct colony was selected and purified by reculturing.
Plant roots along with some soil were suspended in sterile ringer's solution and the suspension thus obtained was streaked on nutrient agar medium for bacterial growth.
Lead resistant bacteria were isolated on nutrient agar supplemented with 100 mg/l concentration of lead acetate trihydrate by the standard pour plate method.
For the preparation of nutrient agar medium, 8 g of NB and 14 g of agar were dissolved in distilled water and final volume was made up to 1L.
All urine samples were cultured on nutrient agar, blood agar, MacConkey agar and incubated at 37[degrees]C for 18-24 h.