431-439<span style="font-size:14.0pt;line-height:
115%;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">Main
characteristics of the delayed luminescence (DL) emitted in the seconds range
from biological systems is analyzed. The correlation between change in DL and
cell's organization, and similarity with some characteristics of DL from solid
state system suggest to connect DL in biological system to decay of collective
electron states formed during energy and charge transport along the macromolecular
ordered structures which form the cell. Results of a proposed soliton model are
discussed, together with some phenomenological evidence which emphasize the
possibility of using DL measurements as an intrinsic probe in biophysical
investigations.</span