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
76
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."
Which of the following can be the best title for this passage?
选项
A、The Way Plants Protect Themselves
B、Differences Between Human and Plants
C、Stressed Plants Produce Aspirin-like Chemical
D、Communication Between Plants
答案
C
解析
主旨大意题。本文主要介绍了科学家的新发现.即植物可以自身合成类似阿司匹林的化学物质以实现自我保护,据此可知[C]为最合适的标题。植物的自我防御有多种方式,自身合成类似阿司匹林的化学物质只是其中之一,故[A]并非本文主要论题;本文主要是介绍植物的特征,与人之间的关系基本没有涉及,排除[B];[D]只是植物合成阿司匹林的作用之一,不能全面反映文章的整体内容,也可排除。
转载请注明原文地址:https://kaotiyun.com/show/vRd4777K
0
考研英语一
相关试题推荐
YouarearesidentlivinginanurbandistrictWritealettertothedirectorwhoisinchargeoftheestatemanagement,complai
Inthefollowingtext,somesentenceshavebeenremoved.ForQuestions41-45,choosethemostsuitableonefromthelist(A、B、C、
Oneofthemostfashionabletreatmentsfordisease,genetherapy,hassofarmadelittleheadwayintacklingoneofthemostmod
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassical.In(1)_____worldduringthe
Whatdoesthefirstsentenceofthepassagemean?DespitethevastpopularityofE-mail,therearestillpeoplewhodon’tthink
TheGreatTransformationiscausedby______.Todayitisimpossibleforpeopletobuildaremarkablenewcivilizationbecause__
Accordingtothetext,theteachershortageissomethingFromthetextwecanconcludethattheauthor
TherecentGenomeWarsweresymbolicofThecriticalthingfacingthescientistsisto
TherecentGenomeWarsweresymbolicofTheword"thaw"(Para.4)mostprobablymeans
(46)TelevisionhastransformedpoliticsintheUnitedStatesbychangingthewayinwhichinformationisdistributed,byalterin
随机试题
男,40岁,急性肠梗阻2天,伴呕吐频繁、乏力、口渴、尿少、口唇干燥、眼窝下陷、皮肤弹性差,脉搏116次/分钟。化验:Hb163g/L,血细胞比容0.55,血清钠140mmol/L,血清钾4mmol/L。治疗措施应是
男性,45岁,因骨盆骨折住院。X线检查发现多部位溶骨性病变。实验室检查:骨髓浆细胞占25%,红细胞沉降率50mm/h,血红蛋白为80g/L,尿本周蛋白阳性,血清蛋白电泳呈现M蛋白,血清免疫球蛋白含量IgG8g/L、IgA12g/L、IgM0.
A.贫血重而出血轻B.贫血与出血相一致C.贫血轻而出血重D.有贫血而无出血E.无贫血而有皮下出血31.缺铁性贫血特发性血小板减少性紫癜
喷砂抛光机器的气源压力范围是
2011年7月11日,A市升湖区法院受理了黎明丽(女)诉张成功(男)离婚案。7月13日,升湖区法院向张成功送达了起诉状副本。7月18日,张成功向升湖区法院提交了答辩状,未对案件的管辖权提出异议。8月2日,张成功向升湖区法院提出管辖权异议申请,称其与黎明丽已
国家重要景区的详细规划,由()。
为保证会计工作正常进行和会计信息的质量,对会计工作人为假设的基本前提有()。
C集团公司正面临着一项困难的供应商抉择——复印机租赁合同的竞争者有5家,5家公司给出的报价相差不大,集团公司以前也并没有与任何一家有过合作关系。如果签订的采购合同不公平,日后势必出现一些消极的影响,不利于集团公司的采购业务。公司必须权衡许多问题,并承诺在3
设,若,则该幂级数的收敛半径等于__________.
设某种零件的长度L~N(18,4).从一大批这种零件中随机取出10件,求这10件中长度在16~22之间的零件数X的概率分布.数学期望和方差.
最新回复
(
0
)