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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.’
- 1.1The 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.’
Mid 19th century: from fluorspar (which fluoresces), on the pattern of opalescence.
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