This oscillation may be represented in the case of acridine and fluorescein as This theory brings the property of fluorescence into relation with that of colour; the forms which cause fluorescence being the coloured modifications: ortho-quinonoid in the case of acridine, paraquinonoid in the case of fluorescein.
Unlike resorcin it does not give a fluorescein with phthalic anhydride.
a-pyrone condenses with the benzene ring to form coumarin and isocoumarin; benzo-'y-pyrone constitutes the nucleus of several vegetable colouring matters (chrysin, fisetin, quercetin, &c., which are derivatives of flavone or phenyl benzo-y-pyrone); dibenzo--ypyrone is known as xanthone; related to this substance are fluorane (and fluorescein), fluorone, fluorime, pyronine, &c. The pyridine ring condenses with the benzene ring to form quinoline and isoquinoline; acridine and phenanthridine are dibenzo-pyridines; naphthalene gives rise to a-and /3-naphthoquinolines and the anthrapyridines; anthracene gives anthraquinoline; while two pyridine nuclei connected by an intermediate benzene nucleus give the phenanthrolines.
This tautomerism may be of a twofold nature :-(I) it may involve the mere oscillation of linkages, as in acridine; or (2) it may involve the oscillation of atoms, as in fluorescein.
One defect a fluorescein angiogram test may reveal are abnormal blood vessels which leak blood into the surrounding tissues.
A special form of angiography used by eye doctors is called fluorescein angiography.
A subset of patients also had fluorescein angiography performed every 6 months.
aspheric designs, principles of fitting, fluorescein patterns, photorefractive surgery, diabetes and red eye.
Control of transglutaminase activity in human keratinocytes by using the newly developed fluorescein cadaverine incorporation technique.
capillary, the view of the choroidal vessels and retinal capillaries is soon obscured by the rapid leakage of fluorescein from the choroidal vasculature.
fluorescein used were in nearly all cases adequate.
fluorescein angiography performed every 6 months.
fluorescein angiogram is carried out.
fluorescein dye, ICG dye does not cause urine or skin discolouration.
fluorescein angiogram test may reveal are abnormal blood vessels which leak blood into the surrounding tissues.
FFA is done with black and white retinal photography using the contrast dye, sodium fluorescein, injected into the blood.
Diffuse or focal leakage can be identified by fundus fluorescein angiography (FFA ).
fundus fluorescein angiography (FFA ).
The acid (and anhydride) are largely used in the colour industry (see Fluorescein; Phenol Phthalein) .
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