fluorescence

/fluorescence/

Thân thiện

A scientist observes the fluorescence of a mineral sample under ultraviolet light.

Definition

1. Noun:
   • The emission of light by a substance that has absorbed light or other electromagnetic radiation of a different wavelength: Fluorescence is a physical process where a material absorbs light (often invisible ultraviolet light) and then immediately re-emits light at a longer, usually visible, wavelength. The emitted light stops almost as soon as the exciting radiation is removed.

Examples of Usage

• Noun:
  • The bright fluorescence of the mineral under UV light made it easy to identify.
  • Scientists use the property of fluorescence in biological staining to visualize cell structures.
  • The jellyfish's green fluorescence is caused by a protein called green fluorescent protein (GFP).

Advanced Usage

• "Fluorescence microscopy": A technique that uses fluorescence to generate an image, allowing scientists to see specific components within a cell.

  • Fluorescence microscopy revealed the location of the virus within the tissue.

• "Fluorescence quenching": A process that decreases the fluorescence intensity of a substance.

  • The addition of the chemical caused fluorescence quenching, indicating a molecular interaction.

Variants and Related Words

• Fluoresce (verb): To exhibit or produce fluorescence.

  • Certain dyes fluoresce brightly when exposed to blue light.

• Fluorescent (adjective):

  • Having the property of fluorescence.

    • The fluorescent dye was injected into the bloodstream.
  • (Commonly) Referring to a lamp that produces light via fluorescence.

    • The office was lit by fluorescent lights.

• Fluorophore (noun): A component of a molecule that causes it to fluoresce.

  • The researcher attached a fluorophore to the antibody to track its movement.

Synonyms

• Luminescence: A broader term for the emission of light not resulting from heat, which includes fluorescence and phosphorescence.
• Glow: A general, non-technical term for emitting light, often used informally to describe fluorescence.

Related Phrases and Compounds

• Fluorescence in situ hybridization (FISH): A laboratory technique used to detect and localize specific DNA sequences on chromosomes.
• Fluorescence resonance energy transfer (FRET): A mechanism describing energy transfer between two light-sensitive molecules.
• X-ray fluorescence: The emission of characteristic "secondary" X-rays from a material that has been excited by high-energy X-rays.

Học thuật

Noun

1. light emitted during absorption of radiation of some other (invisible) wavelength