Like all other foods of plant or animal origin, milk contains several indigenous enzymes which are constituents of the milk as secreted. The principal constituents of milk (lactose, lipids and proteins) can be modified by exogenous enzymes, added to induce specific changes. Exogenous en- zymes may also be used to analyse for certain constituents in milk. In addition, milk and most dairy products

Vitamins are organic chemicals required by the body in trace amounts but which cannot be synthesized by the body. The vitamins required for growth and maintenance of health differ between species; compounds regarded as vitamins for one species may be synthesized at adequate rates by other species. For example, only primates and the guinea-pig require ascorbic acid (vitamin C; section 6.4) from their diet; other species possess the enzyme gluconolactone oxidase which is necessary for the synthesis of vitamin C from D-glucose or D-galactose

4.7.I Occurrence and microheterogeneity B-Lactoglobulin is a major protein in bovine milk, representing about 50% of total whey protein and 12% of the total protein of milk. It was among the first proteins to be crystallized, and since crystallizability was long considered to be a good criterion of homogeneity, B-Ig, which is a typical

The stability, or instability, of the milk fat emulsion is very significant with respect to many physical and chemical characteristics of milk and dairy products. The stability of the emulsion depends strongly on the integrity of

Lactose is the principal carbohydrate in the milks of all mammals; non mammalian sources are very rare. Milk contains only trace amounts of other sugars, including glucose(50 mg\), fructose, glucosamine, galac- tosamine, neuraminic acid and neutral and acidic oligosaccharides The concentration of lactose in milk varies widely between species(Table 2.1). The lactose content of cows'milk varies with the breed of cow

一、 General properties 1.其电负性(electronegativity)仅次于氟(4.0)、氧(3.5) 2.N的三重键键能大于P、C的三重键键能: N=N 945kJ mol-l, P=P 481kJ-mol-l, -C=C-8355kJmol-l;

1990年6月25日国际劳工组织通过。本公约在国际劳工公约系列中称为“第170号公约” 中国劳动部于1992年8月27日提交国务院批准。 国际劳工组织大会: 经国际劳工局理事会召集,于1990年6月7日在日内瓦举行其第七十七届会议,并 注意到有关的国际劳工公约和建议书,特别是,1971年本公约和建议书,1974年职业癌 病公约和建议书,1977年工作环境(空气污染、噪音和震动)公约和建议书

§6-1 氧化─ 还原反应 §6-2 电极电势 §6-3 氧化－还原平衡和还原电位的应用

§5-1 溶度积 §5-2 沉淀—溶解平衡的移动 §5-3 多种沉淀之间的平衡

一、 General Properties 1.根据σ键的数目,碳可釆取sp、sp2、sp3杂化,其最大配位数为4 2.由于碳—碳单键的键能特别大,所以C一C键非常稳定,具有形成均键( homochains)的倾向