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The duckweed Lemna minor L. clone St was used to investigate the effect of 10 heavy metals under the standardised test conditions of the ISO protocol 20079. By using growth rates derived from frond number (FN), fresh weight (FW), dry weight (DW), chlorophyll and carotenoid (Car) contents, concentration-response curves for all heavy metals and all growth(More)
Cobalt (Co2+) inhibits vegetative growth of Lemna minor gradually from 1 μM to 100 μM. Fronds accumulated up to 21 mg Co2+ g(-1) dry weight at 10 μM external Co2+ indicating hyperaccumulation. Interestingly, accumulation of Co2+ did not decrease the iron (Fe) content in fronds, highlighting L. minor as a suitable system for studying effects of Co2+(More)
Fronds of the duckweed Lemna minor L. clone St form colonies of different sizes on the basis of stipes connecting mother and daughter fronds for some time after the development of daughter fronds. All the metals (AsO(4)(3-), AsO(2)(-), Cd(2+), CrO(4)(2-), Co(2+), Cu(2+), Ni(2+), Hg(2+), Tl(+) and Zn(2+)) and one non-metal (SeO(4)(2-), SeO(3)(2-)) tested(More)
Lemna minor L. (duckweed) forms colonies through vegetative propagation because mother fronds remain connected for some time with their daughter fronds by stipes. The colony size is controlled by abscission of stipes at a specific preformed abscission zone. Application of silver ions (Ag(+) ) enhances the rate of frond abscission, thus resulting in smaller(More)
Hazard assessment often needs to compare inhibition values of different test species and different test durations. But the three different methods to calculate inhibition in growth inhibition tests (final biomass, growth rate, area under the growth curve) may lead to very different and sometimes contradicting numerical sensitivities of the test species.(More)
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