agar

(redirected from nutrient agar)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to nutrient agar: blood agar, MacConkey agar

agar

(ä`gär, ā`–, ăg`är), product obtained from several species of red algae, or seaweedseaweed,
name commonly used for the multicellular marine algae. Simpler forms, consisting of one cell (e.g., the diatom) or of a few cells, are not generally called seaweeds; these tiny plants help to make up plankton.
..... Click the link for more information.
, chiefly from the Ceylon, or Jaffna, moss (Gracilaria lichenoides) and species of Gelidium, harvested in eastern Asia and California. Chemically, agar is a polymer made up of subunits of the sugar galactose; it is a component of the algae's cell walls. Dissolved in boiling water and cooled, agar becomes gelatinous; its chief uses are as a culture medium (particularly for bacteria) and as a laxative, but it serves also as a thickening for soups and sauces, in jellies and ice cream, in cosmetics, for clarifying beverages, and for sizing fabrics. See also RhodophytaRhodophyta
, phylum (division) of the kingdom Protista consisting of the photosynthetic organisms commonly known as red algae. Most of the world's seaweeds belong to this group.
..... Click the link for more information.
.

Agar

(ā`gər), the same as HagarHagar
or Agar
, according to the Book of Genesis, servant of Abraham's wife Sarah and mother of his eldest son, Ishmael. She and her son were sent out into the wilderness because of Sarah's jealousy. An angel aided her there.
..... Click the link for more information.
.

Agar

A major constituent of the cell walls of certain red algae, especially members of the families Gelidiaceae and Gracilariaceae. Extracted for its gelling properties, it is one of three algal polysaccharides of major economic importance, the others being alginate and carrageenan. Agar is composed of two similar fractions, agarose and agaropectin, in which the basic unit is galactose, linked alternately α-1,3-( d -galactose) and β-1,4-(α- l -galactose).

Agar is prepared by boiling the algae in water, after which the filtered solution is cooled, purified, and dried. It is an amorphous, translucent material that is packaged in granules, flakes, bricks, or sheets. One of its chief uses is as a gelling agent in media for culturing microorganisms. It is also used in making confections, as an emulsifier in cosmetics and food products, as a sizing agent, as an inert carrier of drugs in medicine, and as a laxative. See Culture

agar

[′äg·ər]
(materials)
A gelatinous product extracted from certain red algae and used chiefly as a gelling agent in culture media.

agar

a complex gelatinous carbohydrate obtained from seaweeds, esp those of the genus Gelidium, used as a culture medium for bacteria, a laxative, in food such as ice cream as a thickening agent (E406), etc.
References in periodicals archive ?
The plates containing the nutrient agar were allowed to stay overnight while that of potato dextrose agar was incubated for 3 days.
The method measured how many times (out of 10) the inoculated components can transfer viable cells to a nutrient agar plate.
This new version Nutrient Agar is formulated according to ISO 6579:2002, ISO 10273:2003 and ISO 16654:2001, and is tested in accordance with ISO/TS 11133-2:2003.
Isolated colonies were then subcultured onto a MacConkey agar plate and a nutrient agar slant, and identified using the Enterotube II system (BD Diagnostics, Sparks, MD), according to the manufacturer's specifications.
Serratia marcescens ATCC 14756 was grown on nutrient agar (NA), tryptone agar, and tryptic soy agar (TSA) (Difco) plates at 25[degrees]C and then a "lawn of growth" was inoculated to NA and TSA plates supplemented with one sugar (10% by weight/volume addition of glucose, sucrose, lactose, or sorbitol to traditional media) and incubated at 25[degrees]C, 30[degrees]C and 37[degrees]C for 24 hours.
The readymade nutrient agar medium (23 g) was suspended in distilled water (1000 ml) and heated up to boiling until it dissolved completely.
The sample was transferred to a nutrient agar plate, streaked, and incubated at 60 [degrees] C (140 [degrees] F) for approximately 12 hours.
All bacterial strains were maintained on Nutrient Agar plates or in Nutrient Broth (Difco).
The medium contains 4-methyl umbelliferyl-[beta]-D-glucuronide or "MUG" with nutrient agar (NA).
magnifying glass * 3 petri dishes with nutrient agar
Turbid samples are examined either by plating out the deposit or through direct addition of nutrient agar.
All tests were conducted using Tryptic Soy Agar (TSA), a world standard nutrient agar for bacterial detection.