A novel technique was developed for the preparation of Cu-15 wt pct Cr composite with high strength and conductivity.The composite powders with refined microst
目的 探讨囊性纤维跨膜转运调节物(cystic fibrosis transmembrane conductance regulator, CFTR)基因在中国人先天性单侧输精管缺如(congenital unilateral absence of the vas deferens, CUAVD)患者中的突变频率及热点.方法 应用聚合酶链反应-单链构象多态(PCR-SSCP)、银染技术及PCR产物