以丙烯酸酯为主要原料,通过种子乳液聚合法合成了乳液型纸塑复合胶粘剂。讨论了单体的选择 与配比、引发剂、pH值调节剂、乳化剂用量、聚合时间等因素对聚合反应及纸塑复合胶性能的影响

8.1酶的化学性质和作用特点 8.2酶的命名和分类 8.3酶的作用机制 8.4温度和PH对酶促反应的影响 8.5酶浓度和底物浓度对酶促反应的影响 8.6抑制剂和激活剂对酶促反应的影响 8.7食品加工中的重要的酶 8.8固定化酶

Modified atmosphere packaged (MAP )prepared fresh produce provides substrates and environmental conditions conducive to the survival and growth of microorganisms. Minimal processing treatments such as peeling and slicing disrupt surface tissues, expose cytoplasm and provide a potentially richer source of nutrients than intact produce(Brackett 1994; Barry-Ryan and O'Beirne, 1998, 2000). This, combined with high Aw and either close to neutral (vegetables) or low acid (many fruits) tissue pH, facilitate microbial growth (Beuchat, 1996)

1.试将下述化学反应设计成电池 (1)AgCl(s)=Ag+(aAg+)+Cl-(ac-) (2)AgCl(s)+I-(ar-)=AgI()+Cl-(acr-) (3)H2(pH2)+HgO(s)=Hg()+H2O() (4)Fe2+(aFe2+)+Ag+(+)=Fe3+(aFe3+)+Ag(s)

1、醋酸菌分离培养基:1%酵母膏,1%葡萄糖,pH4.5,琼脂2%,0.1MPa灭菌20分 钟。干热灭菌CaCO3。6个250ml三角瓶,各装10ml培养基。使用前分别加入3%无水乙 醇和2%CaCO3

一、填空题(每空0.5分,共10分) 1.植物组织培养按培养的方式分为培养和培养。 2.1960年,英国学者 Cocking用分离原生质体成功,从而创新原生质体的培养技术。 3.大多数植物组织培养的适宜温度范围是,培养基的PH值范围是

一、物质 1、固体 2、液体 3、气体 4、有机化学 5、无机化学

a淀粉酶食用酶的提取:发酵液350U/mL加入先溶好的Na2PO4,CaCl2各1-2%,调pH6.5加热至65℃,立即冷却至室温压滤

It is beyond the scope of this class to understand the following. If only one equilibration is in effect, the pH of the solution is determined by one Henderson-Hasselbalch equation

3.3酸碱溶液[H+]的计算 全面考虑、分清主次、合理取舍、近似计算 物料平衡电荷平衡*质子条件