FIG. 4.

Quantification of the time-resolved fluorescence parameters for the four groups. (a) The mean value of the average lifetime from 360 to 600 nm, (b) average lifetime at 400/40 nm, (c) slow decay constant τ₂ at 400/40 nm, and (d) fractional contribution of the slow decay component A₂. The letters above the bars were used to show the groups with significant difference. For example, in (a), the average lifetime over all wavelength of the control group (labeled as A) was significantly different than the average lifetime of the collagenase group (labeled as B; p<0.05). There was no significant difference for groups labeled with same letters. Such as in (a), no significant difference was observed for the average lifetime between the control group (labeled as A) and the ribose group (labeled as AB). Color images available online at www.liebertonline.com/tec