大学英语教学中导入文化背景知识的探讨

一段时间以来，我们的大学英语教学以语言形式为主，而忽视了英美国家文化知识的导入，结果导致了学生不能灵活得体地运用语言。本文结合自己的教学实践，通过阐述文化和语言的关系，文化知识对英语教学的作用，说明文化导入在英语教学中的重要性，进而从教与学两方面去探索如何在英语教学中隔人文化，提高英语教学水平。     

Insertion Mutagenesis of Trichoderma atroviride by Restriction Enzyme-mediated DNA integration

The integration of transforming DNA mediat-ed by the in vivo action of restriction enzymes(RE-MI) was first described in yeast. Insertion mutage-nesis by REMI is a method that is being used togenerate mutations whose molecular basis can beeasily identified. REMI mutagenesis has a majoradvantage over classical mutagenesis in that themutants are marked with a molecular tag by themutagenic event. REMI has been described inmany organisms including the filamentous fungi,and its technology ha…