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(A) Coumarin 30 (C30) fluorescence (donor filter set) at 5× magnification; (B) cellulose nanofibril (CNF) fluorescence (acceptor filter set) at 5× magnificationl (C) energy transfer efficiency map at 5× magnification; (D) C30 fluorescence at 100× magnification; (E) CNF fluorescence at 100× magnification; (F) energy-transfer-efficiency map at 100× magnification [111]. (Reprinted with permission from Zammarano et al., 2011.)
