Difference in reproductive activity of Eisenia between summer and winter and influence of TiO2. All tests were performed according to OECD Test Guideline No. 222  in natural soil. The figure shows some of the results as an example comparing the control vessel (control from the tests with NM-105) with test soils containing 200 mg/kg NM-105 or NM-103. The mean number of offspring per vessel and the standard deviation are presented.
Schlich et al. Environmental Sciences Europe 2012 24:5 doi:10.1186/2190-4715-24-5