STUDIES ON THE CHEMICAL CONSTITUENTS OF ARISTOLOCHIA TUBIFLORA DUNN Studies on the Constituents of Aristolochia mollissima Hance Amides from Peperomia tetraphylla Injury in renal proximal tubular epithelial cells Induced by aristololactam I Studies on solid phase extraction method of aristolochic acids and aristololactams in rat urine Observation of penetration,distribution and accumulation in human renal proximal tubular epithelial cells by aristololactam-Ⅰ