2023QS最佳留学城市排名发布，伦敦连续四次蝉联榜首
6月29日，QS发布了2023全球最佳留学城市排名，对比了140个主要留学目的地，其中包括 30 个新上榜的城市。 其中，在全球十佳留学城市中，英国、德国和澳大利亚分别拥有两所，但美国没有一所高校进入TOP 10榜单。 ...
AQA A Level Chemistry复习笔记7.7.5 Anticancer Drugs
Action of Anticancer Drugs In the 1960s the drug cis-platin was discovered, which has been extremely effective in treating a number of different types cancer such as testicular, ovarian, cer...
AQA A Level Chemistry复习笔记7.7.4 DNA
DNA The nucleic acid DNA is a polynucleotide – it is made up of many nucleotides bonded together in a long chain A nucleotide is a building block consisting of a phosphate group, 2-deoxyribo...
AQA A Level Chemistry复习笔记7.7.3 Enzymes
Enzymes Enzymes are biological catalysts ‘Biological’ because they function in living systems ‘Catalysts’ because they speed up the rate of chemical reactions without being used up or change...
IBO课改后IBDP HL数学考什么？
课改后IBDP HL数学考什么？ IBO自2021年课改后，IBDP数学分为两大科目： 数学分析与方法AA（Analysis and Approaches）、 数学应用与解析AI（Application and Interpretation） AA比较偏向纯数学，AI更侧重具体应...
英国大学研究生热门专业有哪些？
英国大学的硕士课程之中包括一年制硕士，这也使得英国大学凭借着时间短的高性价比吸引着众多留学生。那么在选择留学的过程中，英国大学研究生热门专业有哪些？接下来小编带大家一起来看看吧~ 医学专业 如今疫情环...
AQA A Level Chemistry复习笔记7.7.2 Proteins
Enzymes Enzymes are biological catalysts ‘Biological’ because they function in living systems ‘Catalysts’ because they speed up the rate of chemical reactions without being used up or change...
AQA A Level Chemistry复习笔记7.7.2 Proteins
Proteins Each amino acid contains an amine (-NH2) and carboxylic acid (-COOH) group The -NH2 group of one amino acid can react with the -COOH group of another amino acid in a condensation re...
AQA A Level Chemistry复习笔记7.6.2 Biodegradability & Disposal of Polymers
Biodegradability Biodegradable polymers Both polyesters and polyamides can be broken down using hydrolysis reactions This is a major advantage over the polymers produced using alkene monomer...
AQA A Level Chemistry复习笔记7.5.5 Quaternary Ammonium Salts
Quaternary Ammonium Salts Quaternary ammonium salts are chemical analogues to ammonium chloride, NH4Cl, in which the hydrogens have been replaced by four alkyl groups They are very useful in...
AQA A Level Chemistry复习笔记7.5.4 Nucleophilic Addition–Elimination
Nucleophilic Addition–Elimination An important class of reactions that ammonia and amines undergo is nucleophilic substitution with acyl chlorides (or acid chlorides) and acid anhydrides The...
AQA A Level Chemistry复习笔记7.5.3 Nucleophilic Substitution
Nucleophilic Substitution The lone pair on the nitrogen atom in amines makes them good nucleophiles, just like ammonia When ammonia reacts with a haloalkane a nucleophilic substitution react...
