( ( ( Fluorescence : ) ( ( ( The property ) ( of ( certain materials ) ) ) ( to ( ( ( absorb ( radiation ( of ( ( ( ( certain wavelengths ) , ) ( usually ultraviolet ) ) , ) ) ) ) and ) ( ( re-emit ( the radiation ) ) ( as light ) ) ) ) ) ) . )
(ROOT (NP (NP (NNP Fluorescence)) (: :) (NP (NP (DT The) (NN property)) (PP (IN of) (NP (JJ certain) (NNS materials))) (S (VP (TO to) (VP (VP (VB absorb) (NP (NP (NN radiation)) (PP (IN of) (NP (NP (JJ certain) (NNS wavelengths)) (, ,) (NP (RB usually) (NN ultraviolet)) (, ,))))) (CC and) (VP (VB re-emit) (NP (DT the) (NN radiation)) (PP (IN as) (NP (NN light)))))))) (. .)))
Fluorescence : The property of certain materials to absorb radiation of certain wavelengths, usually ultraviolet, and re-emit the radiation as light.
(ROOT (S (NP (DT The) (JJ light-producing) (NN process) (NN fluorescence)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN substance)) (VP (VP (VBZ absorbs) (NP (JJ shorter-wavelength) (JJ ultraviolet) (NN light))) (CC and) (VP (ADVP (RB then)) (VBZ gives) (PRT (RP off)) (NP (NP (DT the) (NN energy)) (PP (IN as) (NP (JJ visible) (NN light))))))))) (. .)))