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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