硝基化合物是指分子中含有硝基(-NO2的化合物,可以看作是烃分子中的氢原子被硝基取代后得到的化合物,常用RNO2或ArNO2表示。 1.分类 (1)根据烃基不同可分为:脂肪族硝基化合物rnO2和芳香族硝基化合物arNO2 (2)根据硝基的数目可分为:一硝基化合物和多硝基化合物

一.糖酶与消化: a-淀粉酶:唾液淀粉酶(水解a-1,4-糖苷键) 淀粉酶 胰淀粉酶 (a-d-g)n-淀粉酶:水解G非还原端(大麦麦芽) 支链淀粉酶:水解a-1,6-糖苷键 多糖酶纤维素酶(B-D-G)n:除牛等动物外,一般动物无此酶

1.实验过程中常遇到的两类数字 (1)数目:如测定次数;倍数;系数;分数 (2)测量值或计算值。数据的位数与测定准确度有关

(1)可疑数据的取舍——过失误差的判断方法:Q检验法;格鲁布斯( Grubbs)检验法。确定某个数据是否可用。 (2)分析方法的准确性———系统误差的判断显著性检验:利用统计学的方法,检验被处理的数据是否存在统计上的显著性差异

§9-1 原电池和电极电势 §9-2 电极电势的应用 §9-3 电动势和自由能的关系

1-1试以千卡/摩尔为单位,计算相应于以下各值的能 量:(a)240毫微米,(b)480毫微米,(c)6.1微米,(d12.2 微米,(e)1700厘米1,()3400厘米一和(g)34,000厘米-1 解:若以千卡/摩尔为单位,则能量可按如下简单公式计 算

(1)大多数有色金属矿物都是以硫化物形态存于自然界中。例如铜、铅、锌、镍、钴、汞、钼等金属多为硫化物。此外,稀散金属的锢,锗,镓、铊等常与铅锌硫化物共生,铂族金属又常与镍钴共生。因此一般的硫化矿都是多金属复杂矿,具有综合利用的价值。 (2)硫化矿冶金过程的复杂性:主要原因是硫化物不能直接用碳把金属还原出来,因此硫化物的冶炼途径,必须根据硫化矿石的物理化学特性及成分来选择

1. Lipids encompass a large and diverse group of organic compounds 1.1 Lipids are broadly defined as biological molecules that are soluble in organic solvents. 1.1.1 Lipids are usually extracted from biological materials by nonpolar solvents like ether, chloroform(氯仿), benzene(苯). 1.2 The biological functions of lipids are diverse. 1.2.1 Certain lipids(e.g., triacylglycerols(三脂酰甘油), commonly called fats) serve as efficient reserves for the storage of energy

1. Hemoglobin is a multisubunit allosteric rotein that carries 02 in erythrocyte. 1.1 Hemoglobin is a well-studied and well-understood protein. 1.1.1 It was one of the first proteins to have its molecular mass accurately determined. 1.1.2 The first protein to be characterized by ultracentrifuge. 1.1.3 The first protein to be associated with a specific physiological function

1. Carbohydrates are aldehyde or ketone compounds with multiple hydroxyl groups or substances that can yield such compounds on hydrolysis(p. 293) 1.1 Carbohydrates are the most abundant biomolecules on earth and have multiple roles in all forms of life. 1.1.1 Carbohydrates serve as energy stores (e.g., starch in plants, glycogen in animals), fuels (e.g., glucose), and metabolic intermediates (e.., ATP, many coenzymes)