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 (flo͝o-rĕs′ē-ĭn, flô-, flō-)
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.


(ˌflʊəˈrɛsɪɪn) or


(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: C20H12O5


(flʊˈrɛs i ɪn, flɔ-, floʊ-)

a red crystalline compound, C20H12O5, that in alkaline solutions produces an intense green fluorescence: used as a tracer and in dyes.
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Noun1.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)
solution - 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 precipitation
dye, dyestuff - a usually soluble substance for staining or coloring e.g. fabrics or hair
bromeosin, 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


n fluoresceina
References in periodicals archive ?
Also on display will be the low cost Lux family of miniature digital fluorometers optimized to monitor Chlorophyll a, Turbidity, Hydrocarbon, Gelbstoffe, Phycoerythrin Cyanobacteria, Phycocyanin Cyanobacteria and many tracer dyes including Rhodamine & Fluorescein.
In the study, fluorescein (5 mg/ml) was administered topically in 54 human subjects undergoing screening colonoscopy.
Direct immunofluorescence assay (IFA) with fluorescein isothiocyanate-conjugated anti-Francisella serum (BulBioNCIPD) was used to detect F.
The sensor probes of the CYP2C9*2 and CYP2C9*3 alleles were labeled with fluorescein at the 3' end, and the anchor probes were coupled with LightCycler Red 640 (CYP2C9*2) or LightCycler Red 705 (CYP2C9*3) at the 5' end (see Table 1).
For example, due to the existence of multiple forms of fluorescein, the apparent quantum yield of fluorescein changes from 0.
Similarly, a test being developed at the Medical College of Pennsylvania in Philadelphia exposes cultured dog kidney cells to a suspected toxin, then looks for increased permeability to a fluorescein dye due to membrane damage.
Fluorescein eye drops may also be used to determine tear production.
Optometrists and contact lens fitters in routine practice frequently use sodium fluorescein for clinical assessment.
Physicians from Klinikum rechts der Isar in Munich, Germany presented results from a preclinical study that investigated the optimal timing for use of Cellvizio(R) GI imaging with intravenous fluorescein in a pig model in a poster (Abstract PS-W-22).
A fluorescein angiograph of the retina showed knobby hyperfluorescence of the retinal arterioles with minimal leakage, as well as some spots of leakage at the level of the retinal pigment epithelium.
Single-labeled fluorescein probes were designed complementary to the wild-type p53 sequence.
The normalized (relative to the maximum absorption) molecular extinction coefficient of fluorescein is shown in Fig.