Size exclusion chromatograms recorded at 250 nm (Fig. 1.) show the molecular weight distributions of
organic molecules in the filtered (0.20 μm) aqueous phase after five weeks of fungal growth in media where
U(VI) had been added as the nitrate. Under the present analytical conditions the calibration range is 1.2 kD to
60 kD which corresponds to a retention time window of 5.6 to 12.5 minutes. Molecules with sizes outside of
the calibration range are denoted by their retention times although this particular column separates reasonably