fluorescein

Thân thiện

A scientist adds fluorescein to a beaker of water.

Definition

1. Noun:
   • A synthetic organic compound and dye: Fluorescein is a synthetic chemical compound belonging to the xanthene dye family. It is characterized by its ability to absorb light and re-emit it as a bright, fluorescent greenish-yellow glow, especially under blue or ultraviolet light.
   • A diagnostic and tracer agent: Due to its intense fluorescence and non-toxic nature at low concentrations, it is widely used as a diagnostic tool in medicine and as a tracer in various scientific and engineering applications.

Examples of Usage

• Noun:
  • The ophthalmologist applied fluorescein eye drops to stain any scratches on the cornea.
  • Fluorescein angiography is a common test to examine blood flow in the retina.
  • Environmental scientists added fluorescein to the groundwater to trace its path through the aquifer.

Advanced Usage

• "Fluorescein isothiocyanate (FITC)": A derivative of fluorescein commonly used as a fluorescent label in biochemistry and cell biology to tag antibodies and other molecules for microscopic imaging.
  • The protein was conjugated with FITC for visualization under the fluorescence microscope.
• "Fluorescein staining": A medical procedure, particularly in ophthalmology, where fluorescein is used to highlight defects or abnormalities on the surface of the eye.
  • The fluorescein staining revealed a dendritic ulcer on the patient's cornea.

Variants and Related Words

• Fluoresce (verb): To emit light of a certain wavelength after absorbing light of a shorter wavelength. Fluorescein is named for this property.
  • The solution will fluoresce brightly under a UV lamp.
• Fluorescence (noun): The property or process of fluorescing.
  • The intense fluorescence of the dye made it easy to detect.
• Fluorescent (adjective): Having the property of fluorescence; emitting light via fluorescence.
  • The marker contained a fluorescent dye.

Synonyms

• Fluoresceine: An alternative spelling.
• Resorcinolphthalein: A systematic chemical name for fluorescein.
• Tracer dye: Describes its common functional use.

Related Phrases and Compounds

• Fluorescein angiography: A medical imaging technique using fluorescein dye and a special camera to visualize blood vessels in the eye.
• Fluorescein sodium: The water-soluble salt form commonly used in medical applications.

Học thuật

Noun

1. 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)

Từ đồng nghĩa

• fluoresceine
• fluorescent dye
• resorcinolphthalein