compromised body in low numbers), organisms that are normally nonpathogenic can cause infection. The infectious dose will vary with the organism and the health of those infected. For example, Shigella flexneri requires the ingestion of only a few hundred organisms to cause intestinal disease. Salmonella typhi requires

The primary purpose of a buffer is to control the pH of the solu￾tion. Buffers can also play secondary roles in a system, such as controlling ionic strength or solvating species, perhaps even affect￾ing protein or nucleic acid structure or activity. Buffers are used to stabilize nucleic acids, nucleic acid–protein complexes, proteins

Molecular biologists routinely use restriction enzymes as key reagents for a variety of applications including genomic mapping, restriction fragment length polymorphism (RFLP) analysis, DNA sequencing, and a host of recombinant DNA methodologies. Few

由于国内英语教学中写作训练薄弱，大批学生只会单词，不懂语境和搭配，出现了各种可笑 的中文思维现象。我们写作教学中专门强调语感的培养，除单词记忆和句型操练之外，在此 专门选编了 300 个闪光的英文句子，涉及面很广，配有译文并用黑体标出了句子衔接的主 干框架。读者可以在阅读中仔细领会每句话表达的妙处，遣词造句的独特设计

由于国内英语教学中写作训练薄弱,大批学生只会单词,不懂语境和搭配,出现了各种可笑的中文思维现 象。我们写作教学中专门强调语感的培养,除单词记忆和句型操练之外,在此专门选编了300个闪光的英 文句子,涉及面很广,配有译文并用黑体标出了句子衔接的主干框架。读者可以在阅读中仔细领会每句话表 达的妙处,遣词造句的独特设计

一、课程的地位、性质和任务(The Status, Character and the Teaching Purpose) 《法律英语》是依据《大学英语教学大纲》对大学英语应用提高阶段在专 业英语方面的教学要求,适应中国加入世贸组织后进一步扩大对外交流形式的 需要,以培养更多既有扎实法律专业知识又精通外语的法律人才的需求,所开 设的课程

本书内容涵盖大学英语教学大纲所要求掌握的所有语法项目。语言简洁,讲解深入浅出。每一章节通过【重点提炼】、【难点聚焦】、【盲点曝光】、【考点探源】【学以致用】五个版块,将语法知识与语言实践巧妙地结合起来,是一本全面、实用的英语语法工具书

A General Outline of Professional English for the students of plant protection Course No.: B3012111 Apply The Profession: Plant Protection Course Property: Elective Course Time: 8th semester Hours: