Definition of fluorescence in US English:

fluorescence

noun

  • 1The visible or invisible radiation emitted by certain substances as a result of incident radiation of a shorter wavelength such as X-rays or ultraviolet light.

    • ‘This is because fluorescence at this wavelength is strongly absorbed by chlorophyll within the overlying cells.’
    • ‘When illuminated with violet light, the tumour emits pink fluorescence that is detected by a highly sensitive camera.’
    • ‘The cellular genes are treated with fluorescence and literally light up the gene dots on the chip.’
    • ‘The fluorescence intensity emitted by the chloroplasts is dependent on the amount of light absorbed by them.’
    • ‘By mixing different dyes, the colour of the fluorescence can be selected and hence a screen can be built up from loops of the fibres.’
    • ‘Any fluorescence under ultraviolet light may also provide clues to the identity and status of a gemstone.’
    • ‘The fluorescence is not visible because the background was subtracted in each spectrum.’
    • ‘The greenish fluorescence seen under the light is due to an ectothrix infection of hairs, in which fungal spores form a sheath on the outside of the hair.’
    • ‘The excited donor will emit fluorescence, leading to a decrease of efficiency.’
    • ‘Our own observations showed that fluorescence was visible throughout the cytoplasm.’
    • ‘A laboratory technician checked urine for ultraviolet fluorescence indicating the presence of riboflavin.’
    • ‘When a beam strikes the card, the material produces fluorescence in the visible spectrum.’
    • ‘My pupils contracted painfully from the relentless fluorescence of the lights above.’
    • ‘This is consistent with the weak dityrosine fluorescence observed under UV light.’
    • ‘The reflected fluorescence was detected via photomultipliers.’
    • ‘As pollen grains and pollen tubes emitted very strong fluorescence, the pathways of growing pollen tubes could be easily observed.’
    • ‘This fluorescence is visible even when the paper screen is at a distance of two metres from the apparatus.’
    • ‘The emitted fluorescence light from the sample surface was collected through a quartz flow cell.’
    • ‘The uralolite exhibits faint green fluorescence in shortwave ultraviolet radiation.’
    • ‘Protoplasts showing bright fluorescence were counted as viable.’
    light, brightness, gleam, glow, glint, glimmer, sparkle, twinkle, flicker, glitter, glisten, shimmer, flash, dazzle, beam, flare, glare, radiance, illumination, luminescence, luminosity, incandescence, phosphorescence
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    1. 1.1 The property of absorbing light of short wavelength and emitting light of longer wavelength.
      • ‘Other mutants displayed green fluorescence or lacked fluorescent properties.’
      • ‘At each step of the dynamics, the instantaneous fluorescence lifetime was computed.’
      • ‘Leaves were kept in darkness for 30 min before recording the fluorescence parameters.’
      • ‘To do so, it is common to gain a measure of PSII electron transport using chlorophyll fluorescence.’
      • ‘One of the main attractions of chlorophyll fluorescence is that it appears to give a measure of photosynthesis.’
      • ‘It should be noted that ultraviolet fluorescence is not unknown in gibbsite.’
      • ‘The fluorescence spectrum of rose bengal is redshifted as the polarity of the solvent decreases.’
      • ‘The abbreviations for chlorophyll fluorescence parameters and their derivation are as described previously.’
      • ‘Tryptophan fluorescence is frequently used to learn about the properties of proteins.’
      • ‘Second, it was established that cyan and green emitters can be modified so as to produce an intermediate spectrum of fluorescence.’
      • ‘Greater sensitivity can be achieved using laser activated fluorescence detectors.’
      • ‘It seemed that the uranium compounds emitted yet another kind of radiation, not X-rays and not related to fluorescence.’
      • ‘No particularly strong fluorescence of calcite, especially by comparison with glass, has been noticed.’
      • ‘The content of the fluorescence was determined using quinine fluorescence as a standard.’
      • ‘Steady-state fluorescence parameters were measured at each light level.’
      • ‘There are many familiar examples of fluorescence and phosphorescence in our daily lives.’
      • ‘In fact, tyrosine fluorescence is blue shifted relative to tryptophan fluorescence.’
      • ‘At steady state, cells were centrifuged and the fluorescence of the supernatant measured.’
      light, lighting, radiance, gleam, glitter, brilliance, glow, glare, dazzle, flash, shimmer
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Origin

Mid 19th century: from fluorspar (which fluoresces), on the pattern of opalescence.

Pronunciation