| 单词 | agar | |||||||||||||
| 释义 | agara·garA0135800 (ā′gär′, ä′gär′) also a·gar-a·gar (ā′gär-ā′gär′, ä′gär-ä′-)agar(ˈeɪɡə)a•gar(ˈɑ gɑr, ˈæg ər)n. a·gar(ā′gär′, ä′gär′)
agarAgar(ā`gər), the same as HagarHagaror 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(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. . AgarA 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]agaragaragar[ag´ahr]a·gar(ah'gar, ā'gar),agar(ā′gär′, ä′gär′) alsoagar-agar(ā′gär-ā′gär′, ä′gär-ä′-)Agar(1) AgarA gelatinous, sulfated polysaccharide extracted primarily from Gelidium cartilagineum, Gracilaria confervoides, and related species of red algae (seaweed); it melts at ±100ºC and solidifies at ±40ºC. Herbal medicine Agar has been used as a bulk laxative, as it is highly hydrophilic. Microbiology Agar is the most commonly used support medium for bacterial and fungal culture, as nutrients, antibiotics, salts and various growth enhancers and inhibitors are easily incorporated into the media. Agar is also used as an emulsifier in foods; it cannot be digested by humans. (2) AGAR Australian Group on Antimicrobial Resistance Study. An ongoing surveillance of antimicrobial resistance in Australian teaching hospitals,which began in 1986. a·gar(ā'gahr)agarA seaweed extract, sometimes called agar-agar, much used in bacteriological laboratories because it forms a convenient gel for the suspension of nutrient culture material, such as blood or broth, on which micro-organisms can be grown in an incubator.agara complex POLYSACCHARIDE obtained from marine algae, which is widely used (in gel form) as a solidifying agent. Agar has two main components, agarose and agaropectin. Agar is used in various kinds of microbiological MEDIUM, and refined forms of agar or agarose are used in techniques such as ELECTROPHORESIS and gel filtration. In industry it is used as a gelling agent in foods such as jellies, soups and ice cream.Agar has certain properties that make it particularly valuable in MICROBIOLOGY:
Agar medium is prepared by adding agar, often before autoclaving (see AUTOCLAVE), to the nutrients etc. of the medium. Agar medium is generally contained in a PETRI DISH (plate) or test tube. The test tubes containing agar are called ‘slants’ or ‘slopes’ when they allow the medium to set at an angle. When the agar solidifies in a vertical tube it is called a ‘deep’. In a Petri dish the medium solidifies as a layer over the base of the dish. Agara·gar(ā'gahr)AGAR
agar
Synonyms for agar
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agar - any culture medium that uses agar as the gelling agent