咖啡酸-o-甲基转移酶

This is Scientific Americans 60-Second Science. Im Cynthia Graber. This will just take a minute. Saliva contains many useful components: lubricants, enzymes for breaking down food and now compounds that can reveal a persons age. Thats according to a

发表于:2018-12-24 / 阅读(64) / 评论(0) 分类 Scientific American(六)月

Ever get a sour stomach after your morning coffee? Well, you might end up switching to a dark roastbecause that coffee concoction may leave you with a happier tummy. That's according to the research presented at the American Chemical Society meeting

发表于:2018-12-24 / 阅读(66) / 评论(0) 分类 Scientific American(三)月

图片1 by Mignon Fogarty This is an expanded show based on the original episode covering when to use affect with an a and when to use effect with an e. This question is from Eric on the voicemail line. I have a question for you regarding the affect

发表于:2019-01-02 / 阅读(58) / 评论(0) 分类 英语语法 Grammar Girl

AGRICULTURE REPORT - Restrictions on Methyl Bromide By Mario Ritter Broadcast: Tuesday, March 16, 2004 This is Steve Ember with the VOA Special English Agriculture Report. Graphic Image Some chemicals

发表于:2019-01-06 / 阅读(88) / 评论(0) 分类 农业与发展

On Friday afternoon a judge sentenced lawyer Mickey Mantle to 24 hours in jail for contempt. Mantle had just won a lawsuit against a man who had struck Mantles client. The client had accidentally spilled a diet soda onto the defendants new sneakers,

发表于:2019-01-16 / 阅读(62) / 评论(0) 分类 365个英语简短小故事

Science and Technology Epigenetics and stress Baby blues 科技 外因遗传与压力 新生儿蓝调曲 A mother's stress while she is pregnant can have a long-lasting effect on her children's genes 母亲孕期压力过大会对孩子的基因造成长

发表于:2019-01-26 / 阅读(58) / 评论(0) 分类 经济学人科技系列