一、核酸及蛋白质常用数据 1.核苷三磷酸的物理常数 摩尔溶液(pH70)中λmax时的最大吸

水质一酸度的测定一酸碱指示剂滴定法(碱标准溶液滴定法) 地表水中,由于溶入CO2或由于机械、选矿、电镀、农药、印染、化工等行业排放的含 酸废水的进入,致使水体的pH值降低。由于酸的腐蚀性,破坏了鱼类及其他水生生物和农 作物的正常生活及生长条件,造成鱼类及农作物等死亡。因此,酸度是衡量水体变化的一项 重要指标

3.3.1根据所培养微生物的微生物类群来分①细菌培养基②放线菌培养基③霉菌培养基3细菌培养基营养肉汤( nutrient broth):牛肉膏3g;蛋白胨5g;水1000 ml ph7.2~7.4放线菌培养基高氏1号:

一、化学动力学基础 二、底物浓度对酶反应速率的影响 三、酶的抑制作用 四、温度对酶反应的影响 五、pH对酶反应的影响 六、激活剂对酶反应的影响

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

Fresh fish products are usually more perishable than most other foodstuffs due to their high aw, neutral pH, and presence of autolytic enzymes. The spoilage of fish and shellfish results from changes caused by oxidation of lipids, reactions due to activities of the fishes'own enzymes, and the metabolic activities of microorganisms (Ashie et al., 1996). The rate of deterioration is highly temperature dependent and can be inhibited by the use of low storage

As we know from the definition, intelligent or smart packaging monitors and gives information about the quality of the packed food. According to Huis in't give Veld (1996) the changes taking place in the fresh food product can be categorised as (i) microbiological growth and metabolism resulting in pH- changes, formation of toxic compounds off-odours, gas and slime formation

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

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)