Definition of fluorescence in English:

fluorescence

noun

  • 1[mass noun] The visible or invisible radiation produced from certain substances as a result of incident radiation of a shorter wavelength such as X-rays or ultraviolet light.

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

Origin

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

Pronunciation:

fluorescence

/flɔːˈrɛs(ə)ns//flʊəˈrɛs(ə)ns/