title: Upper electron-excited states in bioluminescence: experimental indication.
abstract: The involvement of upper electron-excited states in bacterial bioluminescence process was studied with excitation energy-accepting molecules. The fluorescent aromatic compounds, anthracene and 1.4-bis(5-phenyloxazol-2-yl)benzene, were chosen. Energies of their lowest excited singlet states are higher than the energy of the analogous state of the bioluminescence emitter; their absorption spectra and bioluminescence do not overlap. Hence, the excitation of these molecules by singlet-singlet energy transfer or by light absorption is excluded. Sensitized fluorescence of these compounds in the bioluminescence systems has been recorded, indicating the activity of upper electron-excited states in the bioluminescent process.
authors.affiliation: Institute of Biophysics, Krasnoyarsk 660036, Russia. na_qdr@hotmail.com
authors.forename: N S
authors.initials: NS
authors.lastname: Kudryasheva
authors.forename: E V
authors.initials: EV
authors.lastname: Nemtseva
authors.forename: Y P
authors.initials: YP
authors.lastname: Meshalkin
authors.forename: A G
authors.initials: AG
authors.lastname: Sizykh
mesh_terms: D000873:Anthracenes / Q000737:chemistry; D004583:Electrons; D004735:Energy Transfer; D008163:Luminescent Measurements; D010080:Oxazoles / Q000737:chemistry; D010776:Photobacterium / Q000201:enzymology*; D013050:Spectrometry, Fluorescence
chemical_list: D000873:Anthracenes; D010080:Oxazoles; C028380:POPOP; C034020:anthracene