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 ?
aeruginosa: No Petri-plate of MacConkey agar expressed gram-negative CFU.
pertussis colonies did not grow on common laboratory media such as MacConkey agar and blood agar and were distinguished from other Bordetella species by oxidase- and catalase-positive but urease- and nitrate-nega-tive reactions.
The culture media used included nutrient agar, MacConkey agar and chocolate agar.
coli O157:H7 should be cultured using MacConkey agar because this particular strain does not ferment sorbitol.
At predetermined intervals, 25-gram samples were withdrawn, blended with 225 ml of diluent, and enumerated onto a culture medium of 1% L-Rhamnose MacConkey agar (RMAC).
Following the morphological studies of bacterial colonies and cells, the biochemical properties of unknown bacteria were explored through their growth and colony color on two selective and differential media, MacConkey agar and mannitol salt agar, and the results of the oxidase test.
Microbiology specialist Lab M, has added a modified MacConkey Agar to its range of dehydrated culture media.
Comparison of different phenotypic tests for detection of MBL producing isolates Phenotypic test Number of MBL positive isolates (n=21) Modified Hodge test on Mueller Hinton Agar 15 Modified Hodge test on MacConkey Agar 19 Combined Ceftazidime + EDTA 8 disc test Imipenem + EDTA 20 Double disc synergy test 20 EDTA-Imipenem microbiological assay 20 Extended EDTA Ceftazidime 12 disc synergy Imipenem 20 test Meropenem 18 n, number of screen positive isolates tested
In the Compared Pathology Laboratory for Wild Animals (Lapcom) of the Department of Pathology of the Faculty of Veterinary Medicine and Animal Science (FMVZ), University of São Paulo (USP), São Paulo State, Brazil, the organ was opened in a sterile manner and swabs of the mucosa were seeded in MacConkey Agar (Difco[R]) and XLT4 Agar (Difco[R]) and kept in microbiological oven at 37[grados]C under aerobiosis for 24 hours.
c\oli, Harlequin SMACBCIG (Sorbitol MacConkey Agar with BCIG) helps reduce .false-positive.
100 [micro]l of the diluted sample was plated on STAA agar, Plate Count Agar, Sorbitol MacConkey agar, Violet Red Bile Glucose agar, APT agar and the PS agar.