Sugar Power for Cell Phones Using enzymes commonly found in living cells,a new type of fuel cell produces small amounts of electricity from sugar.If the technology is able to succeed in mass production,you may some day share your sweet drinks with your cell phone. When researchers previously used enzymes in fuel cells,they had trouble keeping them active,says Shelley D.Minteer of St Louis University1.Whereas biological cells continually produce fresh enzymes,theres no mechanism in fuel cells to replace enzymes as they quickly degrade. In the new fuel Cell,tiny polymer bags of enzyme are embedded in a membrane that coats one of the electrodes.When glucose from a sugary liquid gets into a pocket,the enzyme oxidizes it,releasing electrons and protons.The electrons cross the membrane and enter a wire through which they travel to the other electrode,where they react with.oxygen in the atmosphere to produce water.The flow of electrons through the wire constitutes an electrical current that can generate power. Sugar-eating fuel cells could be an efficient way to make electricity.Sugar is easy to find. And the new fuel cells that run on it are biodegradable,so the technology wouldnt hurt the environment.The scientists are now trying to use different enzymes that will get more power from sugar.They predict that popular products may be using the new technology in as little as 3 years. A When enzymes can be commonly found in living ceils. C When the technology of a new type of fuel cell is suitable for mass production. 2. What trouble did Minteer and Klotzhach have in their research? B They had trouble keeping biological cells active. D They had trouble finding mechanism for producing enzymes. A when bags of enzyme are embedded in the new fuel cell. C when the enzyme oxidizes the glucose from a sugary liquid that goes through D when the enzyme oxidizes the sugary liquid that goes through a pocket. A Their limitless power generation capacity is amazing. C Their limited power generation capacity is the result of great efforts. 5. According to the last paragraph,what is NOT true of the new fuel cells? B The new fuel cells are environment friendly. D It will take some time before the new fuel cells can be used in popular products.
国际英语资讯:France tells Italy working alone on migration issue wont have results
国际英语资讯:Pentagon suspends planning for joint drills with S. Korea in August
国际英语资讯:AIIB, IsDB Group join forces to grow sustainable infrastructure
体坛英语资讯:Messi misses penalty as Iceland earn first World Cup point
国内英语资讯:Chinas first visa center in CEE opens in Bucharest
国际英语资讯:Brazils Supreme Court allows political satire during electoral campaign
国际英语资讯:4 dead, hundreds injured as 6.1-magnitude quake rocks western Japan
国际英语资讯:Turkeys Erdogan, his alliance win presidential, parliamentary elections
国内英语资讯:Cambodian PM Hun Sen meets senior Chinese official on bilateral ties
体坛英语资讯:Denmark beats Peru 1-0 in tough WC Group C clash
国际英语资讯:French court sentences two men to prison for killing Chinese designer
国际英语资讯:Venezuelas Diosdado Cabello sworn in as head of national legislature
国内英语资讯:Top legislature hears reports on legal deliberations
国内英语资讯:Chinas top legislature defines coastguard powers
国内英语资讯:Top legislature hears reports on 2017 final accounts, audit work
国内英语资讯:Xi meets executives of famous multinational companies
国内英语资讯:China, Nepal pledge to enhance cooperation
国内英语资讯:China to calmly face fickle U.S. attitude: official
国内英语资讯:Chinese president meets Papua New Guinea PM, calling for deepening cooperation
国际英语资讯:Spotlight: UN rights body continues with its busy session amid regrets for U.S. announcement
国际英语资讯:UN chief welcomes positive steps towards peace between Eritrea, Ethiopia
Social jet lag 社交时差
国际英语资讯:Venezuelas president warns of plot by retired military officers
国际英语资讯:Iran urges intl community to stop Saudi-led offensive in Yemen
国际英语资讯:Palestinians hold 13th anti-Israel Friday rally in eastern Gaza
国际英语资讯:UN chief urges Security Council to act with one voice on Middle East, North Africa
体坛英语资讯:VAR helps Sweden get over South Korea
体坛英语资讯:Belgium beat Panama 3-0 in World Cup Group G match
国际英语资讯:Europe must be able to defend borders: central European states
体坛英语资讯:Harry Kane hits twice to give England 2-1 win over Tunisia in World Cup Group G match
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |