首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Putting Plants to Work Using the power of the sun is nothing new. People have had solar-powered calculators and buildings wi
Putting Plants to Work Using the power of the sun is nothing new. People have had solar-powered calculators and buildings wi
admin
2014-02-28
48
问题
Putting Plants to Work
Using the power of the sun is nothing new. People have had solar-powered calculators and buildings with solar panels(太阳能电池板)for decades. But plants are the real experts. They’ve been using sunlight as an energy source for billions of years.
Cells in the green leaves of plants work like tiny factories to convert sunlight, carbon dioxide(二氧化碳), and water into sugars and starches(淀粉), stored energy that the plants can use. This conversion process is called photosynthesis(光合作用). Unfortunately, unless you’re a plant, it’s difficult and expensive to convert sunlight into storable energy. That’s why scientists are taking a closer look at exactly how plants do it.
Some scientists are trying to get plants, or biological cells that act like plants, to work as very small photosynthesis power stations. For example, Maria Ghirardi of the National Renewable Energy Laboratory in Golden. Colo., is working with green algae(水藻). She’s trying to trick them into producing hydrogen instead of sugars when they perform photosynthesis. Once the researchers can get the algae working efficiently, the hydrogen that they produce could be used to power fuel cells in cars or to generate electricity.
The algae are grown in narrow-necked glass bottles to produce hydrogen in the lab. During photosynthesis, plants normally make sugars or starches." But under certain conditions, a lot of algae are able to use the sunlight energy not to store starch, but to make hydrogen." Ghirardi says. For example, algae will produce hydrogen in an airfree environment. It’s the oxygen in the air that prevents algae from making hydrogen most of the time.
Working in an airfree environment, however, is difficult. It’s not a practical way to produce cheap energy. But Ghirardi and her colleagues have discovered that by removing a chemical called sulfate(硫酸盐)from the environment that the algae grow in, they will make hydrogen instead of sugars, even when air is present.
Unfortunately, removing the sulfate also makes the algae’s cells work very slowly, and not much hydrogen is produced. Still, the researchers see this as a first step in their goal to produce hydrogen efficiently from algae. With more work, they may be able to speed the cells’ activity and produce larger quantities of hydrogen.
The researchers hope that algae will one day be an easy-to-use fuel source. The organisms are cheap to get and to feed, Ghirardi says, and they can grow almost anywhere: "You can grow them in a reactor, in a pond. You can grow them in the ocean. There’s a lot of flexibility in how you can use these organisms."
Scientists study how photosynthesis works because they want to
选项
A、improve the efficiency of it.
B、turn plant sugars to a new form of energy.
C、get more sugars and starches from plants.
D、make green plants a new source of energy.
答案
D
解析
根据第二段最后两句话“Unfortunately,unless you’re a plant,it’s difficult and expensive toconvert sunlight into storable energy.That’s why scientists are taking a closer look at exactly how plants do it.”以及第三段第一句“Some scientists are trying to get plants,or biological
转载请注明原文地址:https://kaotiyun.com/show/PpQd777K
本试题收录于:
职称英语理工类B级题库职称英语分类
0
职称英语理工类B级
职称英语
相关试题推荐
TheStoryofLaniFive-year-oldLanistilltakessevenmedicineswithherbreakfasteverymorning."She’sverygoodaboutit
LightNight,DarkStarsThousandsofpeoplearoundtheglobestepoutsidetogazeattheirnightsky.Onaclearnight,with
WhereHaveAlltheBeesGone?Scientistswhostudyinsectshavearealmysteryontheirhands.Allacrossthecountry,honey
WarmPeopleLikelytoKeepColdatBayStayingpositivethroughthecoldseasoncouldbeyourbestdefenseagainstgettingi
Thiskindofanimalsareonthevergeofextinction,becausesomanyarebeingkilledfortheirfur.
Apeculiarlypointedchinishismostmemorablefacialcharacteristic.
ScienceandTechnologyThereisadifferencebetweenscienceandtechnology.【B1】______Sciencehastodowithdiscoveringth
Hecannotdiscriminatebetweenagoodideaandabadone.
ScientistsDevelopWaysofDetectingHeartAttackGermanresearchershave(1)anewgenerationofdefibrillatorsandearlywarn
HumanandCultureHumanbeingsareanimals.Webreathe,eatanddigest,andreproducethesamelifeprocessescommontoal
随机试题
以下选项中与if(a==1)a++;elsea=b;语句功能不同的语句是()。
根据企业所得税法的规定,下列说法不正确的有()。
马斯洛的需要层次理论中,把哪一种需要看做最高层次的需要【】
阅读鲁迅《风波》中的一段文字,然后回答小题。七斤将破碗拿回家里,坐在门槛上吸烟;但非常忧愁,忘却了吸烟,象牙中级六尺多长湘妃竹烟管的白铜斗里的火光,渐渐发黑了。他心里但觉得事情似乎十分危急,也想想些方法,想些计划,但总是非常模糊,贯穿不得:“辫子
紫花洋地黄苷A用温和酸水解方法水解得到的糖是
关于癌痛三阶梯疗法基本原则的表述,不正确的是()。
某证券公司大楼的地下一层建筑面积为4000m2,层高为4m,设置了机械排烟和机械补风系统,高压变电室、低压配电室共用一套组合分配IG541混合气体灭火系统,系统组成示意图见下图。火灾报警控制器、气体灭火控制器安装在同层消防控制室内。消防控制室与低压配电室的
下列不能计入存货采购成本的是()。
下列法律法规中将教师视为专业人员的是()
4,6,12,30,84,()
最新回复
(
0
)