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
Is that Folgers coffee in your cup or Maxwell House? Now you no longer have to rely on your nose to tell. Researchers have devel
Is that Folgers coffee in your cup or Maxwell House? Now you no longer have to rely on your nose to tell. Researchers have devel
admin
2018-01-28
62
问题
Is that Folgers coffee in your cup or Maxwell House? Now you no longer have to rely on your nose to tell. Researchers have developed an analyzer that can distinguish between 10 commercial brands of coffee and can even tell apart coffee beans roasted at various temperatures for different times. The advance could help growers determine within minutes whether a particular batch of coffee is just as good as the previous one or whether it’s undrinkable.
Researchers have been trying for years to come up with a simple way to analyze coffee. But it’s no easy task. The challenge is that the pleasant smell of roasted coffee beans consists of more than 1,000 compounds that change with roasting temperatures and time. Traditional methods of chemical analysis generally have difficulty distinguishing between compounds that are very similar to one another. And "electronic noses," an array of dyes, and other devices that change color or chemical properties when they react with certain molecules suffer from the same drawback.
Over the past decade, chemist Kenneth Suslick and colleagues at the University of Illinois, Urbana-Champaign, have refined the electronic nose approach. In the new study, they used dyes that interact strongly with other chemicals, making them more specific. They then put drops of 36 dyes on a polymer (聚合物) film the size of a nickel. The colors in the dyes belonged to a range of chemical classes, including pH indicators and molecules that change color with certain chemical vapors.
The device produced a pattern of colors as each coffee’s mixture of volatile (易蒸发的) compounds interacted with the dyes. When the investigators pumped vapors from various coffees including Starbucks, Sumatra Roast and Folgers Grande Supreme Decaf-over the arrays, all generated unique color patterns, like a molecular "fingerprint," they report this month in Analytical Chemistry.
The array doesn’t give any information about the individual compounds in the smell. "The important thing is that we can easily tell the difference between different roastings and coffees," notes Suslick. And that should help growers quickly and cheaply analyze problems with coffee, such as burnt flavors, during their initial screening process, says food scientist Felix Escher at the Swiss Federal Institute of Technology Zurich.
The applications for the kind of device created by Suslick’s team go beyond coffee, says chemist Pavel Anzenbacher at Bowling Green State University in Ohio. Similar arrays, he notes, could be used in everything from detecting explosives to spotting contaminants (污染物) in water.
The coffee analyzer developed by researchers is most probably intended for ______.
选项
A、consumers
B、cafeterias
C、coffee plantations
D、coffee wholesalers
答案
C
解析
原文该句中的The advance指的就是该段前一句提到的analyzer,可见该句表明分析器是为growers(种植者)设计的,选项中只有C“咖啡种植园”与之相关,因此本题应选C。
转载请注明原文地址:https://kaotiyun.com/show/uET7777K
0
大学英语六级
相关试题推荐
Theideaofusingyourdishwashertocookamealhasbeenaroundsincethe’80s.It’sbeenusedtocook【C1】______mainlyfish.Th
GetEnoughSleep—orElse!Agoodnight’ssleepismoreimportanttoyourhealththanyoumayrealize.[A]MeganJoneskne
Sevenyearsago,whenIwasvisitingGermany,Imetwithanofficialwhoexplainedtomethatthecountryhadaperfectsolution
Womenwhodrankthreeormorecupsofcoffeeadaywere30percentlesslikelytohavememorydeclineatage65thanwhosewhod
A、Takingadvantageofraresunshine.B、Puttingupwithannoyingbears.C、Havingaccesstonutritiousfood.D、Protectingthemselv
A、Returnthebikesbacktothesamepick-uppoint.B、Usethebikeforashortorlongtrip.C、Swipetheirordinarytravelcards
Inthethrillingprogressiveyearsoftheearly20thcentury,fewthingsweremoreattractivethanthepromiseofscientifickno
A、Onlymotherscantakethepaidparentalleave.B、Noparentalleavecanbetakenafterthechildis8.C、Onlyfamiliesoftwow
A、Heconductslarge-scaletests.B、Hewritesbooksaboutchildren.C、Heteachesattheuniversity.D、Herecommendsbabysitters.
随机试题
有关排卵,以下哪项是错误的
雌二醇地塞米松
治疗痈初期的代表方剂是
韩女士,60岁,跌倒致右股骨颈骨折,现给予持续皮牵引处理。该患者最易发生的并发症是
李春与杜某系夫妻,二人同住甲市城关区无线电厂家属楼,但在老家乙市郊区有房6间,由其长子李明居住。2008年李春夫妇遇车祸双亡。老人的长女李梅已出嫁,住甲市。老人的次子李可(17岁)于2010年考上乙市的某大学,因该大学离李明住处近,李可便要求李明之妻张丽将
利害关系人申请诉前证据保全的,申请人应当提供担保。不提供担保的,裁定驳回申请。人民法院接受申请后,必须在()小时内作出裁定;裁定采取保全措施的,应当立即开始执行。
税收立法程序是税收立法活动中必须遵循的法定步骤,目前我国税收立法程序经过的主要阶段有()。(2016年)
下列哪项是实验病理学的研究方法?()
保持事务的原子性是数据库管理系统中哪一个部件的责任?
【T1】Whatwouldyoudoifyouwereafifthgraderfacingahugehomeworkloadeverynight,andyoufoundbutthattherewasamac
最新回复
(
0
)