title: Spectra of the formaldehyde-induced ultraweak luminescence from yeast cells.
abstract: An increase in the intensity and distinct spectral changes of ultraweak luminescence from the yeast Saccharomyces cerevisiae were measured when the metabolism of cells was drastically altered. A small emission peak and a red emission band 680-850 nm appeared when air-dried cells were imbibed in water. Lethal concentrations of HCHO (0.01%-10%) elicited a 2500 fold increase of the emission intensity and distinct spectral alterations. A transient 500-580 nm emission appeared in the initial phase of interaction. Then a gradually increasing long-lasting red emission band centered around 620 nm predominated in the total spectral range covering 470-850 nm. These emissions were not correlated with minor changes in fluorescence emission and excitation spectra originating from tryptophan, flavins, and unidentified emitters.
authors.affiliation: Institute of Physics and Informatics, Pedagogical University, Krakow, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Godlewski
authors.forename: Z
authors.initials: Z
authors.lastname: Rajfur
authors.forename: J
authors.initials: J
authors.lastname: Sławiński
authors.forename: M
authors.initials: M
authors.lastname: Kobayashi
authors.forename: M
authors.initials: M
authors.lastname: Usa
authors.forename: H
authors.initials: H
authors.lastname: Inaba
mesh_terms: D005557:Formaldehyde / Q000494:pharmacology*; D007700:Kinetics; D008163:Luminescent Measurements; D012441:Saccharomyces cerevisiae / Q000187:drug effects* / Q000378:metabolism; D013050:Spectrometry, Fluorescence
chemical_list: D005557:Formaldehyde