agar

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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 ?
The analysis of the data obtained from Nutrient agar with CLED, MacConkey's agar, HiCrome UTI agar for the detection of dependence of tables 4.at 5% level of significance were tested.
Characteristics of E.coli on different agar media Name of the media Characteristics Nutrient agar Opaque, smooth, flat, moist, white color colonies.
The problem of urine culture has been addressed by the introduction of chromogenic agar (CA) medium which is commercially available for two decades.
saprophyticus produces white colonies.14 Certain identification tests like the catalase oxidase and indole production can be done directly from the colonies on HiCrome UTI agar and antibiotic sensitivity testing without subculturing onto another basic medium is also possible.15
Even with such advantages, sheep blood is still the most ideal for blood enriched agar. Many researchers reported disadvantages of using human blood such as variation in hemolysis production due to old red cells present resulting to misidentification, production of larger zones during antibiotic susceptibility testing, lack of characteristic morphology, and the difficulty of discerning where the growth began (Russell et al., 2006; Changsri et al.
It appears to be Gram- positive cocci in clusters, white, creamy, raised growth on blood-enriched agar, coagulase negative, and DNase negative.
Agars told of Australian chartered accountants with some understanding of Eastern European culture going to serve in offices in that area.
Agars said, "There has been a very strong dialogue between the accounting professions in mainland China and Hong Kong.
coli produced colonies with typical high metallic sheen on EMB agar and blue-green colonies on Hicrome E.
The isolates with high metallic sheen isolated from EMB agar exhibited 6 different types of IMViC reactions (Table 3).
CHROMagar[TM] StrepB (Fort Richard Laboratories, Auckland) is a selective agar that inhibits most bacteria and allows for differentiation of GBS, which produces a mauve colour (Fig 1).
Diverse hemolytic activity was demonstrated by the 72 bacilli on different blood agar plates.