agar

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Related to Agar gel: Agarose gel

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.
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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.
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, 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.
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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 ?
On each 100 mm plate three each of commercial paper disks and agar gel disks containing equal antimicrobial content were applied on each half portion of plate.
Potency of agar gel stock was tested by repeating the test every 15 days.
The results were comparable and difference between agar gel disk and paper disk zone diameter was minimal and much less than the permitted deviation.
Repeated freezing thawing of agar gel stock for about 20 times during the shelf life study showed full potency retention till the end of fifth month for all the tested antibiotics except imipenem which had a shelf life of 23 days.
Agar gel disks prepared rigorously contain almost exact amount of drug in each 10 [micro]l drop thus eliminating the need to permit overfill and under fill.
The need for certification by a national authority, as is required for paper disk, could be eliminated as it would be possible to prepare agar gel stock in house and monitor quality through internal and external quality assurance programme.
Extraction of [alpha]2M from CyI rat serum by agar gel electrophoresis, followed by a fractionation on the Sephadex G-100 column eliminated most of the rat serum proteins, but two that contaminated the [alpha]2M preparation.
The injection of purified [alpha]2M of agar gel origin also led to the increased peak parasitaemia compared to the SI control (12% [+ or -] SD compared to 7% [+ or -] SD).
57) demonstrated in 1965 that quantitative immunodiffusion in agar gel was related to the square of the precipitin ring diameter, Kohn adopted their technique to CA membranes.
Retrospectively, the first-stage RT-PCR amplification products from the positive samples were examined by agar gel electrophoresis and ethidium bromide staining; two produced a faint band corresponding to the first-stage product of 445 bp (data not shown).