Figure 1.

Whole body XRF elemental maps of D. magna exposed to either 320 μg U L^–1 UNP (upper panel) or 159 μg U L^–1 U_ref (lower panel). Calcium distribution was indicative of the carapace, while Fe and Zn indicated soft tissues (displaying fitted K fluorescent peaks). The U (fitted L fluorescent peaks) biodistribution is shown on the right. Both scans were conducted with a 5 μm step size and 200 ms dwell time. All scale bars represent 500 μm, and all elemental signal intensities are scaled logarithmically (linear scale maps with intensity scale can be found in Figure S10). Abbreviations: carapace (C), maxillary gland (Mx), nephridium (N), epipodites (Ep), chorion structures (S), hepatic ceca (Ce), midgut (M), heart (H), embryo (Eb), and ovary (Ov).