P01.52. Comparative study of two bioassays with stressed duckweed and yeast treated with homeopathic preparations

Methods For duckweed, growth rates of leaf area and leaf number were evaluated. For yeast, growth kinetics were determined by measuring slope, yield, and Et50 (point in time when yield was half maximum) of the sigmoid growth curve. The experiments with duckweed and yeast were performed in parallel (same day, same location and identical homeopathic preparations). After screening 17 substances, three homeopathic preparations (Arsenicum album, nosode, gibberellic acid) were chosen for repeated experimental series. Five independent experiments were conducted for each remedy with both bioassays in parallel. Potency levels used were in the range of 17x–33x for duckweed and 17x–30x for yeast. As controls, unsuccussed and succussed water were used. To examine test system stability, systematic negative control experiments were conducted over the complete experimentation period. All experiments were blinded and randomized.