Studies on chemical constituents from stem bark of Trewia nudiflora TISSUE CULTURE OF TREWIA NUDIFLORA Antibacterial Activities of Neolignans Isolated from the Seed Endotheliums of Trewia nudiflora MAYTANSINOIDS FROM THE SEEDS OF TREWIA NUDIFLORA TREWIA NUDIFLORA L.----A RAW MATERIAL PLANT CONTAINING HIGHER MAYTANSINOIDS FR0M CHINA Structural Determination of Fatty Acid Components in the Seed Oils of Five Species of Euphorbiaceae ANTIFEEDANT EFFECT OF MAYTANSINOIDS FROM THE SEEDS OF TREWIA NUDIFLORA ON INSECT PESTS The Research on the Influence of Trewia nudiflora Seed Chemical Components on Its Endophyte