Fluorescence intermittency in blinking quantum dots: renewal or slow   modulation?
  We study time series produced by the blinking quantum dots, by means of an aging experiment, and we examine the results of this experiment in the light of two distinct approaches to complexity, renewal and slow modulation. We find that the renewal approach fits the result of the aging experiment, while the slow modulation perspective does not. We make also an attempt at establishing the existence of an intermediate condition. 
Simone Bianco, Paolo Grigolini and Paolo Paradisi