SSS 2008-09-16
时间：2019-01-08 作者：英语课 分类：Scientific American(九)月
This is Scientific American's 60-Second Science. I'm Cynthia Graber . This will just take a minute.
There’s a traditional bowl in Korea that locals say makes food safer. And they might be right. The bowl is made of almost 80 percent copper 1. Copper ions can escape into the food. That’s a good thing, according to a presentation at the Society for General Microbiology's autumn meeting. Korean scientists showed that copper ions can destroy bacteria in raw fish and shellfish.
The researchers were concerned about a specific seafood 2 bacteria called Vibrio. It causes about 12 percent of food poisoning cases in Korea. The scientists placed a brass 3 plate—brass is a copper alloy—at the bottom of a fish tank. Copper ions diffused 4 into the water. The bacteria absorb the copper from the water. They die and fall from fish gills and flesh to the bottom of the tank. They’re even flushed out of fish organs. After almost two days, the copper had destroyed 99.99 percent of the Vibrio bacteria in those living fish and shellfish. The scientists recommend placing a brass plate in all tanks that contain fish destined 5 for consumption – and, of course, that Koreans keep using traditional kitchenware.
Thanks for the minute for Scientific American's 60-Second Science. I'm Cynthia Graber .
- The students are asked to prove the purity of copper.要求学生们检验铜的纯度。
- Copper is a good medium for the conduction of heat and electricity.铜是热和电的良导体。
- There's an excellent seafood restaurant near here.离这儿不远有家非常不错的海鲜馆。
- Shrimps are a popular type of seafood.小虾是比较普遍的一种海味。
- Many of the workers play in the factory's brass band.许多工人都在工厂铜管乐队中演奏。
- Brass is formed by the fusion of copper and zinc.黄铜是通过铜和锌的熔合而成的。
- A drop of milk diffused in the water. 一滴牛奶在水中扩散开来。
- Gases and liquids diffused. 气体和液体慢慢混合了。