Using the enhancer GAL4/UAS expressionsystem, short-term memory traces of aversive and appetitive olfactory conditioninghave been assigned to output synapses of subsets of intrinsic neurons of themushroom bodies.
After finishing the purification, theactivity of the isolated compound was then studied.
We or I 是动名词 finishing 形式上的主语，同主句的主语 activity 不一致.
宜改为: Afterpurification was finished, the activity of the isolated compound was thenstudied.
或: After finishing the purification, we studied the activity of the isolated compound.
Treated with the new drug, the bloodcholesterol levels of participants were lowered by an average of 30%.
宜改为: Treated with the new drug, participants showed an average of 30% decrease in theirblood cholesterol levels.
The iron concentration was determined usingthe Fenton reaction method.
The iron concentration 同 using the Fenton reaction method 关系上不一致.
宜改为: The ironconcentration was determined by the Fenton reaction method.
或: Wedetermined the iron concentration using the Fenton reaction method.
When measuring the atmospheric level ofcarbon dioxide, air samples from a remote place, such as an island, ispreferred.
宜改为: When theatmospheric level of carbon dioxide is measured, air samples from a remoteplace, such as an island, is preferred.
To further investigate the potential roleof biking in causing infertility, an expanded population of biking athletes wassurveyed.
不定式短语的形式主语是 we or I ，同主句主语 population 不一致.
宜改为: To further investigate the potential role of biking in causing infertility, wesurveyed an expanded population of biking athletes.
To confirm the diagnosis, blood test wasordered.
宜改为: Toconfirm the diagnosis, the doctor ordered blood test.
Inhibition of Acid B on xanthine oxidasewas also reported.
Inhibition of 后面应紧跟 xanthine oxidase , 而不是 Acid B, 隔开后句子就很难读.
宜改为：Inhibition of xanthine oxidase by Acid B was also reported.
The chelating activities for ferrous ion ofthe Acid B were assessed.
The chelating activities 后面应紧跟 Acid B , 而不是ferrous ion.
宜改为：The chelating activities of the Acid B for ferrous ion were assessed.
Reducing power represents the electrondonating capacity, which may serve as a significant indicator of potentialantioxidant activity.
用 which 开头的修饰句, 是要修饰 reducing power , 而不是修饰 electron donating capacity , 所以要紧跟在reducing power 后面.
宜改为： Reducing power, which may serve as a significant indicator of potential antioxidant activity, represents the electron donating capacity. 或: Reducing power represents theelectron donating capacity. It may serve as a significant indicator ofpotential antioxidant activity.
Lincomycin , one of the lincosamideantimicrobial agents which was first isolated more than fifty years ago , isused as a major antibiotic for the treatment of diseases caused by mostGram-positive bacteria.
宜改为：Lincomycin is one of the lincosamide antimicrobial agents which were firstisolated more than fifty years ago. It is used as a major antibiotic for thetreatment of diseases caused by most Gram-positive bacteria.
科技写作中经?；嵊妹世醋魑稳荽适褂?，如 room temperature, university researchers。当用一个名词来修饰另一个名词时，意义一般都很清楚 . 但当三个名词放在一起，或两个名词前再加一个形容词时，就要小心 . 有的情况下 , 3 个或 3 个以上的名词放在一起，表达的意思很清楚，也是一种很简洁的表达方式 . 如: bloodwhite cell number, prostate cancer patient,BeijingUniversitymedical school student.但有时会有多种讲法 . Top university researchers 可以是 researchers of (only) top university 也可以是 (all) university researchers who are top。多个名词排在一起，即使表达明确，也给拥挤的感觉 . 应避免使用多个名词的修饰方式。最好的办法是用介词或其它方式来把他 们分开 , 以便清楚表达它们的修饰关系。多个名词罗列的情况经常发生，下面多举一些例子.
He wrote the quality control groupreports.
宜改为：He wrote the reports of the quality control group.The patient showed chronic liver diseasesymptoms.
宜改为：The patient showed symptoms of chronic liver disease.The human brain oxygen level is quite high.
宜改为：Theoxygen level in human brain is quite high.Their specific inhibition producing effectson fat containing food intake were assessed.
宜改为：Theirspecific effects of inhibition on the intake of fat containing food were assessed.The present investigation evaluated variousspecific drug sample combinations.
宜改为：Thepresent investigation evaluated various combinations of specific drug samples
Penicillin, not stable in water , wasdeveloped during WWII.
The supernatant was collected andconcentrated in vacuum to evaporate the solvent.
Concentrate 就是 evaporate the solvent ，后面的 to evaporate the solvent 是多余的.类似的把一些词的含义再次重复说明是最容易出现的多余用词.类似的 8PM in the evening, blue in color, small in size, in vivo animal models, in vitro cell cultures 都有多余用词的情况。
The results of activities of tested compoundswere listed in Table 1.
Impact 当冲击，碰撞讲 . 如 “ Western popular culture has a huge impact on Asian society ”. 自然科学不同参数的相互影响一般不用 impact 来描写 , 用 affect 或 influence 更合适.
Agree to, agree with
Agree to 是同意 , giving consent. “I agree to a biopsy test”. Agree with 是一致, in accord. “The results agreewith our previous observation”.
Alternate 是交替的，轮流的 . Alternative 是另外的，选择的.
And 是一个非常有用的字 . 它是一个最被经常用到的连接词, 可以连接类似的词 , 词组或句子 . 用 and 连接的词 , 词组或句子是相关联但又各自独立的 . 当排列三个以上的词时，最后的一个词之前加 and . 其它的词后都加逗号.
Pollution in the river affected thepopulation of different animals, such as fishes, birds, and turtles.
Pollution in the river affected thepopulation of different animals, such as fishes, birds and turtles.
一般认为 and 之前加逗号是美国写法，不加逗号是英国写法.
用 and 连接句子时，若两个句子都很简单，中间可以不加逗号.
One liter of water was added and thesolution was left at 4 o C overnight.
One liter of water was added, and thesolution was left at 4 o C overnight.
The assay was carried out by heating thesample in boiling water for two hours, and the volume of the assay solution waskept constant by adding water.
用 and 来开始一个句子也是可以的 . and 起到对一些相关和并列的描述来连接的作用.
AIDS drugs are effective to control thereplication of HIV, but they cannot cure AIDS. And a vaccine for AIDS is stillelusive. Therefore, education and prevention are the most effective weaponsagainst AIDS for now.
用 and 连接两个独立的句子时 , 可以在 and 之前加逗号，也可以不加逗号 . 但连接一个不完整的句子时 , 不能用逗号分开.
The sample was added to the testingsolution, and allowed to react in a water bath at37℃for 10 min.
宜改为：Thesample was added to the testing solution and allowed to react in a water bath at 37℃ for 10 min.
There is increasing interest in naturalantioxidant products for use as medicines and food additives. Vitamin C,vitamin E and carotenoids are some of these widely used natural antioxidants .Reactive oxygen species (ROS) including superpxide anion radical, hydroxyl radicaland hydrogen peroxide, are generated under physiological and pathologicalstresses in human body.
这个例子中，第一句和第二句都与 natural antioxidant有关，但第三句出现了reactive oxygen species,同前面的内容没什么关系,这时第三句同前面的传承上出现了断离.下面的改动中加了个连接句子，把 natural antioxidant 和 reactive oxygen species 连接了起来. There is increasing interestin natural antioxidant products for use as medicines and food additives.Vitamin C, vitamin E and carotenoids are some of these widely used naturalantioxidants . Antioxidants played an important role in lowering oxidativestresses caused by reactive oxygen species (ROS). ROS including superpxideanion radical, hydroxyl radical and hydrogen peroxide are generated underphysiological and pathological stresses in human body.
从一个状况到另一个不相关的状况时，经常用in addition to 的句子衔接.
Oxygenases catalyze the incorporation of amolecule of oxygen (O 2 ) into the substrate. They catalyze the initial andrate-limiting step of L - Trp catabolism in the kynurenine ( Kyn ) pathway.……….. In addition to its role as a L - Trp-catabolizing enzyme, IDO is involvedin the immuno -regulating system………