近年来,疯牛病在世界范围内传播,美国食品与药品管理局( FDA)认为应该将明胶从基本安全(generally regarded as safe)名单中删除。世界上主要明胶生产国,如北美和拉美国家大都为疯牛病遗区,国内外都禁止使用这些地区的明胶生产药用胶囊。2012年中国部分地区爆发的“毒胶囊事件”更是让传统明胶胶囊的开发和生产雪上加霜...
on foam properties ，and HPMC modified foam was applied to foamed concrete.The results show that HPMC can improve the vis -cosity of foaming agent ，inhibit the flow of foam liquid and the gas overflow in bubble ，so as to improve the stability of foam ，but HPMC can reduce the foaming ...