| 释义 |
fluoresceinenUK
fluo·res·ce·in F0206200 (flo͝o-rĕs′ē-ĭn, flô-, flō-)n. An orange-red compound, C20H12O5, that exhibits intense fluorescence in alkaline solution and is used in medicine for diagnostic purposes, in oceanography as a tracer, and as a textile dye.fluorescein (ˌflʊəˈrɛsɪɪn) or fluoresceinen (Elements & Compounds) an orange-red crystalline compound that in aqueous solution exhibits a greenish-yellow fluorescence in reflected light and is reddish-orange in transmitted light: used as a marker in sea water and as an indicator. Formula: C20H12O5fluo•res•ce•in (flʊˈrɛs i ɪn, flɔ-, floʊ-)
n. a red crystalline compound, C20H12O5, that in alkaline solutions produces an intense green fluorescence: used as a tracer and in dyes. [1875–80] Thesaurus| Noun | 1. | fluorescein - a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed)fluoresceine, fluorescent dye, resorcinolphthaleinsolution - a homogeneous mixture of two or more substances; frequently (but not necessarily) a liquid solution; "he used a solution of peroxide and water"absorption indicator - an indicator used in reactions that involve precipitationdye, dyestuff - a usually soluble substance for staining or coloring e.g. fabrics or hairbromeosin, eosin - a red fluorescent dye resulting from the action of bromine on fluorescein; used in cosmetics and as a biological stain for studying cell structures |
TranslationsFluoresceinenUK
fluorescein[‚flu̇′re·sē·ən] (organic chemistry) C20H12O5 A yellowish to red powder, melts and decomposes at 290°C, insoluble in water, benzene, and chloroform, soluble in glacial acetic acid, boiling alcohol, ether, dilute acids, and dilute alkali; used in medicine, in oceanography as a marker in sea water, and in textiles to dye silk and wool. Fluorescein a dye; yellow crystals. Fluorescein is poorly soluble in water; it dissolves better in alcohols and dilute alkalies. Decomposition occurs at the melting point, 314°–316°C. In aqueous solutions, fluorescein exists as a 1:1 mixture of the benzoid (I) and quinoid forms and has a strong yellow-green fluorescence (hence the name). Its structural form is 
Fluorescein belongs to a group of triarylmethane (xanthene) dyes. It colors silk and wool yellow but is not used in the textile industry because of poor colorfastness. It is used to trace the course of underground waters. Its disodium salt (uranine) is a component of fluorescing mixtures, and its isothiocyanate derivatives are used as biological stains for identifying antigens and antibodies. Some halogen-substituted fluoresceins, such as eosins, also have practical value. Fluorescein is produced by the condensation of phthalic anhydride with resorcinol. fluoresceinenUK
fluorescein [floo͡-res´ēn] a fluorescing dye; the sodium salt is used as a contrast medium in retinal angiography and as a diagnostic aid for revealing corneal lesions and fitting contact lenses.fluor·es·ce·in (flōr-es'ē-in), [C.I. 45350] An orange-red crystalline powder that yields a bright green fluorescence in solution and is reduced to fluorescin; a nontoxic, water-soluble indicator used diagnostically to trace water flow. Synonym(s): resorcinol phthalic anhydride, resorcinolphthaleinfluorescein (flo͝o-rĕs′ē-ĭn, flô-, flō-)n. An orange-red compound, C20H12O5, that exhibits intense fluorescence in alkaline solution and is used in medicine for diagnostic purposes, in oceanography as a tracer, and as a textile dye.fluor·es·ce·in (flōr-es'ē-in) [C.I. 45350] An orange-red crystalline powder that yields a bright green fluorescence in solution, and is reduced to fluorescin; a nontoxic, water-soluble indicator used diagnostically to trace water flow and to visualize corneal abrasions or ulcers. fluorescein A green dye that fluoresces bright yellow in blue or ultraviolet light. It is used to tag (label) and thus show up ANTIBODIES in tissues. It is also much used by eye specialists (ophthalmologists) to show up ulcers on the cornea and to delineate for photography the blood vessels of the retina. For the latter purpose, the due is injected rapidly into the bloodstream (fluorescein angiography). The drug is on the WHO official list. Brand names are fluorescein, Minims fluorescein, Minims lignocaine (lidocaine, a local anaesthetic) and fluorescein, and Minims proxymetacaine (a local anaesthetic) and fluorescein.
Fluorescein A brand name for FLUORESCEIN.FluoresceinA fluorescent chemical used to examine the cornea.Mentioned in: Corneal UlcersfluoresceinA fluorescent, weak dibasic acid with a molecular weight of 376 whose sodium salt is used in dilute solution as a dye in the fitting of contact lenses, in the detection of corneal abrasions, etc. It is a yellowish-red compound, which fluoresces a brilliant yellow-green under ultraviolet or blue illumination (Fig. F7). Syn. sodium fluorescein. See fluorexon; Burton lamp; Wood's light; rose bengal; staining; break-up time test; fluorescein test. " > Fig. F7 Fluorescein on the corneal surface staining A, an abraded area, and B, some damaged epithelial cellsfluor·es·ce·in (flōr-es'ē-in) Nontoxic, water-soluble indicator used diagnostically to trace water flow and visualize corneal abrasions. fluoresceinenUK
Related to fluorescein: fluorescein isothiocyanate, Fluorescein sodiumSynonyms for fluoresceinnoun a yellow dye that is visible even when highly dilutedSynonyms- fluoresceine
- fluorescent dye
- resorcinolphthalein
Related Words- solution
- absorption indicator
- dye
- dyestuff
- bromeosin
- eosin
|