| http://www.w3.org/ns/prov#value | - Environmental engineers refer to a stand of poplar trees as a self-assembling, solar-powered, pump-and-treat system to remove solvents such as TCE. By metabolizing available nutrients in toxic substances, these plants convert the substances to less toxic metabolites, and also stimulate the degradation of organic chemicals in the rhizo-sphere by the release of root exudates, explains Steven Roc
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