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
考研
Plants Found in Aspirin Synthesis Aspirin is among the most popular remedies used by people. It turns out some plants like i
Plants Found in Aspirin Synthesis Aspirin is among the most popular remedies used by people. It turns out some plants like i
admin
2013-05-04
80
问题
Plants Found in Aspirin Synthesis
Aspirin is among the most popular remedies used by people. It turns out some plants like it, too. Researchers at the National Center for Atmospheric Research were surprised to discover that stressed plants produce an aspirin-like chemical that can be detected in the air above the plants. The chemical may be a sort of immune response that helps protect the plants, the scientists speculated.
According to the researchers, the finding raises the possibility that farmers, forest managers and others may eventually be able to start monitoring plants for early signs of a disease, an insect infestation or other types of stress. Currently they often do not know if an ecosystem is unhealthy until there are visible indicators, such as dead leaves.
"Unlike humans, who are advised to take aspirin as a fever suppressant, plants have the ability to produce their own mix of aspirinlike chemicals, triggering the formation of proteins that boost their biochemical defenses and reduce injury," NCAR scientist Thomas Karl, the lead researcher, said in a statement. "Our measurements show that significant amounts of the chemical can be detected in the atmosphere as plants respond to drought, unseasonable temperatures or other stresses."
While researchers had known that plants in the laboratory produce a form of aspirin known as methyl salicylate, they had never looked for it in the forest. "But when they set up measuring devices in a walnut grove near Davis, California, to monitor plant emissions that can affect pollution, they discovered measurable amounts of methyl salicylate."
Previous studies have shown that plants being eaten by animals also produce chemicals that can be sensed by other plants nearby. The new findings, announced Thursday by NCAR in Boulder, Colo. , were published in the journal Biogeosciences. The research was funded by the National Science Foundation, NCAR’s sponsor.
Measuring instruments 100 feet above the ground measured methyl salicylate from plants that were stressed by a local drought and unseasonably cool nighttime temperatures followed by large daytime temperature increases. In addition to having an immune-like function, the chemical may be a means for plants to communicate to neighboring plants, warning them of the threat.
"These findings show concrete proof that plant-to-plant communication occurs on the ecosystem level," says NCAR scientist Alex Guenther, a co-author of the study. "It appears that plants have the ability to communicate through the atmosphere." Karl added, " If you have a sensitive warning signal that you can measure in the air, you can take action much sooner, such as applying pesticides. The earlier you detect that something’s going on, the more you can benefit in terms of using fewer pesticides and managing crops better."
According to this passage, humans take aspirin to______.
选项
A、suppress fever
B、release stress
C、communicate with others
D、reduce injury
答案
A
解析
事实细节题。文章开篇就提到阿司匹林是人类使用最为广泛的药物,不过具体效用出现在第三段第一句,明确说明人类服用阿司匹林的目的是治疗发烧,选[A]。而[B]“释放压力”、[C]“相互交流”和[D]“降低伤害”都是植物合成阿司匹林的作用,都不符合题干要求。
转载请注明原文地址:https://kaotiyun.com/show/lRd4777K
0
考研英语一
相关试题推荐
Shoppinghasalwaysbeensomethingofanimpulseactivity,inwhichobjectsthatcatchourfancywhilestrollingareimmediately
YouarearesidentlivinginanurbandistrictWritealettertothedirectorwhoisinchargeoftheestatemanagement,complai
Inthefollowingtext,somesentenceshavebeenremoved.ForQuestions41-45,choosethemostsuitableonefromthelist(A、B、C、
Lotsofcreaturesalreadyreproducewithoutsex.SincethebirthofLouiseBrown,thefirsttest-tubebaby,in1978,(1)_____of
Lotsofcreaturesalreadyreproducewithoutsex.SincethebirthofLouiseBrown,thefirsttest-tubebaby,in1978,(1)_____of
Theincreasingpopularityofmeditationresultsfrompeople’sneedforTheChicagomanisintroducedtoshow
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassical.In(1)_____worldduringthe
IntheUnitedStatestoday,coffeeisamorepopulardrink(1)_____tea,butteaplayed(2)_____interestingpartinthehistory
TheGreatTransformationiscausedby______.Advancingtechnologycouldpossiblymakeus______.
随机试题
男,10岁,眼睑水肿1周,加重4天伴少尿,近1天头晕、眼花、呕吐2次,2小时前抽搐1次。体检:颜面、眼睑及下肢均水肿,BP165/120mmHg。尿常规:尿蛋白(++),RBC15~20/HP,BUN5.8mmol/L。诊断为
中共中央政治局于2019年10月24日召开会议,研究坚持和完善中国特色社会主义制度、推进国家治理体系和治理能力现代化若干重大问题。中共中央总书记习近平主持会议。会议指出,坚持和完善中国特色社会主义制度、推进国家治理体系和治理能力现代化的总体目标是(
与脑膜炎球菌感染增加相关的因素有
A.阳气B.宗气C.糟粕D.精血E.营气“清阳发腠理,浊阴走五藏"中“浊阴"指的是
A、推动作用B、温煦作用C、防御作用D、固摄作用E、气化作用抵抗外邪入侵,依赖气的()
属于氨基糖苷类抗生素的有
[背景资料]某市建设一段36.8km的四车道高速公路沥青混凝土路面工程,通过公开招标,该工程由施工企业甲承包。路面单幅宽11.25m。路面结构形式为:基层为两层18cm的石灰粉煤灰稳定碎石,底基层为一层18cm的石灰粉煤灰稳定碎石;沥青混凝土面层
下列关于项目的可行性研究与贷款项目评估关系的说法,正确的有()。
下列情形中,保证人可以行使先诉抗辩权的是()。
阶级社会发展的直接动力是()
最新回复
(
0
)