~3H-蛋氨酸/缬氨酸空肠喂饲在荷瘤大鼠体内的分布

目的 :观察3H 蛋氨酸 /缬氨酸空肠喂饲在荷瘤大鼠体内的分布。方法 :SD大鼠空肠造瘘 ,皮下接种Walker 2 5 6癌肉瘤 ,分A、B、C、D 4组。分别以平衡氨基酸、去蛋氨酸、平衡氨基酸、去缬氨酸空肠喂养 6d ,注入3H 蛋氨酸 /缬氨酸 7.4× 10 5Bq 0 .5 ,1,2 ,4h后测定肝、胰、小肠、肌肉、血浆及肿瘤组织的放射性强度 ,计算差示摄取比(DUR)。结果 :B组肿瘤组织 2h ,4hDUR高于A组 ,而血浆DUR各时点低于A组。D组肿瘤组织DUR各时点高于C组 ,而血浆DUR低于C组。结论 :3H 蛋氨酸 /缬氨酸在肿瘤组织摄取率高 ,去蛋氨酸 /缬氨酸空肠喂饲后 ,其摄取率更高。     

Declaration of Venice on terminal illness

The 27 October 1983 session of the World Medical Association (WMA) in Venice approved a declaration on the physician's obligations to the terminally ill. Reprinted here are the paragraphs concerning the circumstances under which treatment may be withheld and under which artificial means may be used to keep organs active for transplantation.