Electron transfer bridge inducing polarization of nitrogen molecules for enhanced photocatalytic nitrogen fixation.

Ammonia (NH) plays a crucial role in the production of fertilizers, medicines, fibers, , which are closely relevant to the development of human society. However, the inert and nonpolar properties of NN seriously hinder artificial nitrogen fixation under mild conditions. Herein, we introduce a novel strategy to enhance the photocatalytic efficiency of N fixation through the directional polarization of N by rare earth metal atoms, which act as a local "electron transfer bridge.

[Safety toxicological evaluation of Wen Radix Codonopsis].

Objective: To evaluate the toxicological safety of Wen Radix Codonopsis.

Methods: According to the national standards of food safety(GB 15193.3-2014, GB 15193.