1. Soluble root exudates are notoriously difficult to collect in non-hydroponic systems because they are released in a narrow zone around roots and are rapidly assimilated by rhizosphere microbes. This has substantially limited our understanding of their rates of release and chemical composition in situ , and by extension, their ecological significance. 2.… (More)
The biologically active properties of many nanomaterials, coupled with their rapidly expanding production and use, has generated concern that certain types of nanoparticles could have unintended impacts when released into natural ecosystems. In the present study, the authors report the results of an experiment in which they grew three common species of… (More)
We examined how TiO 2 nanoparticles (nTiO 2) impact the growth and metabolism of three species of freshwater green algae (Scenedesmus quadricauda, Chlamydomonas moewusii, and Chlo-rella vulgaris) that are widespread throughout North America. We exposed laboratory cultures to five initial concentrations of nTiO 2 (0, 50, 100, 200, and 300 ppm) and measured… (More)
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