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请根据短文的内容,回答题。 Sugar Power for Cell PhonesUsing enzymes commonly found in living

请根据短文的内容,回答题。

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.<br>

In fuel cells, chemical reactions generate electrical currents. The process usually relies on precious metals, such as platinum. In living cells, enzymes perform. a similar job, breaking down sugars to obtain electrons and produce energy.<br>

When researchers previously used enzymes in fuel cells, they had trouble keeping them active,says Shelley D. Minteer of St LouisUniversity. Whereas biological cells continually produce fresh enzymes, there&39;s no mechanism in fuel cells to replace enzymes as they quickly degrade.<br>

Minteer and Tamara Klotzbach, also of St LouisUniversity, have now developed polymers that wrap around an enzyme and preserve it in a microscopic pocket. "We tailor these pockets to provide the ideal microenvironment for the enzyme," Minteer says. The polymers keep the enzyme active for months instead of days.<br>

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.<br>

So far, the new fuel cells don&39;t produce much power, but the fact that they work at all is exciting, says Paul Kenis, a chemical engineer at the University of Illinois at Urhana-Champaign.<br>

"Just getting it to work," Kenis says, "is a major accomplishment."<br>

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 wouldn&39;t hurt the environment.<br>

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.<

According to the first paragraph, when can we share our sweet drinks with our cell phones? 查看材料

A.When enzymes can be commonly found in living cells

B.When the technology of producing a new type of fuel cell appears

C.When the technology of a new type of fuel cell is suitable for mass production

D.When the technology of mass producing cell phones appears

提问人:网友deguozou 发布时间:2022-01-07
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第1题
根据下面短文内容,回答题。 The Tough Grass that Sweetens Our Lives 第46题___

根据下面短文内容,回答题。

The Tough Grass that Sweetens Our Lives

第46题___________ 查看材料

A.Eventually, a commercial plant was developed which was 5 percent sweeter than before,but also much stronger and less likely to die from disease.

B.One major gene has been identified by Dr Angelique D"Hont and her team in Montpelier,France.

C.Sugar cane is now much more vigorous and the supply of sugar is therefore more guaranteed.

D.Since the 1960s, scientists have been analyzing the mysteries of the sugar cane"s genetic code.

E.The majority of the world"s sugar now comes from this particular commercial species.

F.Unfortunately, however, the plant started to become weaker and more prone to disease.

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第2题
请根据短文内容,回答题。 The Tough Grass that Sweetens Our LivesSugar cane was once a wild

请根据短文内容,回答题。

The Tough Grass that Sweetens Our Lives

Sugar cane was once a wild grass that grew in New Guinea and was used by local people for roofing their houses and fencing their gardens. Gradually a different variety evolved which contained sucrose (蔗糖) and was chewed on for its sweet taste. Over time, sugar cane became a highly valuable commercial plant, grown throughout the world. __________ (46)<br>

Sugar became a vital ingredient in all kinds of things, from confectionery (糖果点心 ) to medicine, and, as the demand for sugar grew, the industry became larger and more profitable.<br>

__________ (47) Many crops withered(枯萎)and died, despite growers&39; attempts to save them, and there were fears that the health of the plant would continue to deteriorate.<br>

In the 1960s, scientists working in Barbodos looked for ways to make the commercial species stronger and more able to resist disease. They experimented with breeding programmes, mixing genes from the more delicate, commercial type. __________(48) This sugar cane is not yet ready to be sold commercially, but when this happens, it is expected to be incredibly profitable for the industry.<br>

__________(49) Brazil, which produces one quarter of the world&39;s sugar, has coordinated an international project under Professor Paulo Arrudo of the Universidade Estaudual de Campinas in Sao Paulo. Teams of experts have worked with him to discover more about which parts of the genetic structure of the plant are important for the production of sugar and its overall health.<br>

Despite all the research, however, we still do not fully understand how the genes function in sugar cane __________ (50) This gene is particularly exciting because it makes the plant resistant to rust, a disease which probably originated in India, but is now capable of infecting sugar cane across the world. Scientist believes they will eventually be able to grow a plant which cannot be destroyed by rust.

第46题___________ 查看材料

A.Eventually, a commercial plant was developed which was 5 percent sweeter than before,but also much stronger and less likely to die from disease.

B.One major gene has been identified by Dr Angelique D"Hont and her team in Montpelier,France.

C.Sugar cane is now much more vigorous and the supply of sugar is therefore more guaranteed.

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F.Unfortunately, however, the plant started to become weaker and more prone to disease.

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第3题
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Child Consultants

____________ 查看材料

A.sentence

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C.answer

D.question

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第4题
根据下面短文内容,回答题。 Across the Desert The Sahara Desert is not fit f

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第5题
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Kicking the Habit

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B.Wrong

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第6题
根据下面短文内容,回答题。 The Value of Tears The word "film" in Paragraph 1

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The Value of Tears

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A.door

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第7题
根据下面短文内容,回答题。 Approaches to Understanding Intelligences What i

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C.The development of intelligence tests.

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第8题
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The Storyteller

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第9题
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第10题
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"Lucky" Lord Lucan——Alive or Dead ?

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