Taking poplar 741 mediated by Agrobacterium rhizogenes as material,an examination was made concerning the survival of agrobacterium in transgenic plants during the process of transplanting and subculturing on the nutrient medium.

Using a SR source of BEPC and the X-ray diffractometer, the study of multilayers and semiconductor superlattice structure, as well as the measurements of residual stress relaxation anddistribution around the ceramic-metal (Si3N4/Steel) interface have been developed.