Figure 1From: Effect of TiO2 nanoparticles in the earthworm reproduction testNumber of offspring per control vessel in the reproduction test with E. andrei. All tests were performed according to OECD Test Guideline No. 222 [2] in natural soil. The figure shows the mean number of juveniles in the control vessels (containing the natural soil RefeSol 01A) and the standard deviation in tests starting at different times of the year. Results with the same letters are not statistically different.Back to article page