agar

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Related to Mannitol Salt Agar: blood agar, EMB agar, MacConkey agar

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 ?
aureus was identified by distinct visual appearance of colony morphology on Mannitol Salt agar. Gram-negative K.
Purification of isolated colonies was done on mannitol salt agar medium to find out different Staphylococcus species present in the sample.
Mannitol salt agar (MSA) spread plate contained 100 [micro]L/400 [micro]L of a dance studio floor sample and was incubated at 37[degrees]C for a total of 48 hours.
The MacConkey's agar count ranged from 2 x [10.sup.2] to 2.7 x [10.sup.4], and mannitol salt agar count ranged from 2 x [10.sup.2] to 1.6 x [10.sup.4] per ml (Table 1).
Most bacterial media contain 0.5% sodium chloride, but mannitol salt agar contains 7.5% sodium chloride to inhibit many common isolated bacteria.
This was then used to seed 9 cm diameter Petri dishes containing Mannitol Salt Agar (Incofar) and these dishes were incubated at 36.5 [+ or -] 1[degrees]C.
* Laboratory stock culture of Staphylococcus epidermidis ATCC 12228 (mannitol salt agar test)
Following vortex extraction in 2 ml of sterile saline, each was streaked for isolation on blood agar (growth control) and on Mannitol Salt Agar (MSA) and incubated at 37[degrees]C for 24-48 hours.
For the suitable monitoring and prevention of intrahospitable infections caused by MRSA strains, different means from culture for the detection of MRSA have been suggested, among them, Mannitol Salt agar with 6 [micron]g/mL of oxacillin.
Mannitol salt agar (MSA) was used for investigation staphylococci pathogenic types mainly Staphylococcus aureus.
Mannitol salt agar which revealed growth of golden yellowish colonies (Fig.
Prior to 2003, most clinical microbiology laboratories cultured/ screened for MRSA by inoculating non-selective Trypticase[TM] Soy Agar with 5% Sheep Blood and a selective medium such as Mannitol Salt Agar or Phenylethyl Alcohol Agar with 5% Sheep Blood (PEA).