英文科技论文写作中经常使用的标点符号有逗号，句号和分号.冒号和问号使用的情况很少，而惊叹号几乎就不会被使用.现在分号使用的也逐渐减少,一般用句号取代.一篇论文中只是使用逗号和句号也是正常的.句号的使用比较明确,下面主要对逗号的使用作一些说明.逗号虽然很小，但要表达清楚你要传达的信息却离不开它.比如下面的例子，没有逗号时句子不好读.加逗号后,逗号放在不同的地方,意思完全不同 .
Although it was incubated at 50 o C for 24 hours no reaction occurred.
Although it was incubated at 50 o C for 24 hours, no reaction occurred.
Although it was incubated at 50 o C, for 24 hours no reaction occurred.
逗号是用来分开两个独立的句子，下面的句子是可以的 .
Ethanol is used to replace gasoline, and it is produced from corn.
下面的句子就不合适 , 因为逗号后面不是一个完整的句子 .
Ethanol is used to replace gasoline, and is produced from corn.
当一个长的语句出现在句子的前面时， 要用逗号分开 . 若语句不长 , 不需 要停顿， 也可以不用逗号 .
During the process of solvent removal, some crystalline solid was formed.
During the process precipitate was formed.