  On applying a theorem previously derived by Wolf and Collett, we demonstrate
that partially coherent Gaussian Schell model uctuating sources (GSMS) produce
exactly the same optical forces as a fully coherent laser beam. We also show
that this kind of sources helps to control the light-matter interaction in
biological samples which are very sensitive to thermal heating induced by
higher power intensities; and hence the invasiveness of the manipulation. This
is a consequence of the fact that the same photonic force can be obtained with
a low intensity GSMS as with a high intensity laser beam.
