Effects of nitrate uptake on the changes of plasma membrane potential of rice roots Effects of ammonium uptake on the changes of plasma membrane potential of rice roots Primary Physiological Responses of Ammopiptanthus mongolicus Cells Induced by Methyl Jasmonate Effect of pH on nitrate uptake by rice seedlings Oxidative damage of parental drug-sensitive KB cells and multidrug resistant KBv200 cells mediated by anthraquinone derivatives