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
Why does cream go bad faster than butter? Some researchers think they find the answer, and it comes down to the structure of the
Why does cream go bad faster than butter? Some researchers think they find the answer, and it comes down to the structure of the
admin
2009-05-24
105
问题
Why does cream go bad faster than butter? Some researchers think they find the answer, and it comes down to the structure of the food, not its chemical composition—a finding that could help rid some processed foods of chemical preservatives.
Cream and butter contain pretty much the same substances, so why cream should sour much faster has been a mystery. Both are emulsions—tiny globules(小球) of one liquid evenly distributed throughout another. "The difference lies in what’s in the globules and what’s in the surrounding liquid", says Brocklehurst, who led the investigation. In cream, fatty globules drift about in a sea of water. In butter, globules of a watery solution are locked away in a sea of fat. The bacteria which make the food go bad prefer to live in the watery regions of the mixture. "This means that in cream, the bacteria are free to grow throughout the mixture", he says.
When the situation is reversed, the bacteria are locked away in compartments(密封仓) buried deep in the sea of fat. Trapped in this way, individual colonies cannot spread and rapidly run out of nutrients. They also slowly poison themselves with their waste products. "In butter, you get a self-limiting system which stops the bacteria growing", says Brocklehurst. The researchers are already working with food companies keen to see if their products can be made resistant to bacterial attack through alterations to the food’s structure. Brocklehurst believes it will be possible to make the emulsions used in salad cream, for instance, more like that in butter. The key will be to do this while keeping the salad cream liquid and not turning it into a solid lump.
选项
A、it suggested a way to keep some foods fresh without preservatives
B、it discovered tiny globules in both cream and butter
C、it revealed the secret of how bacteria multiply in cream and butter
D、it found that cream and butter share the same chemical composition
答案
A
解析
依据是文章第一段第三行的内容。
转载请注明原文地址:https://kaotiyun.com/show/bLYi777K
本试题收录于:
GCT工程硕士(英语)题库专业硕士分类
0
GCT工程硕士(英语)
专业硕士
相关试题推荐
下列选项中,应当以单位犯罪处罚的有()。
遗嘱继承适用的条件包括()。
根据我国刑法规定,对于连续犯追诉期限的起算,是从()。
民事法律行为是合法行为,因此,民事法律行为的基本要素是()。
Theproblemwiththereadingcourseasmentionedinthefirstparagraphisthat______.Theteachingofreadingwillbesuccess
IntheefforttofireaCivilServiceemployee,hisorhermanagermayhavetospendup$100,000oftaxmoneytodoso.
A:Youhavenodifficultyfindingtheanswertothequestion?B:______.
Ifyouwanttolookupawordinadictionary,whichfloorwouldyougoto?______.Outofofficehours,ifyouhavequestions
Wehavebeentoldthatundernocircumstances______thetelephoneintheofficeforpersonalaffairs.
Susan:I’mgoingtothecinemathisevening.Gordon:______?Susan:It’saWestern:"CowboyComesHome".
随机试题
津贴
A.一级结构B.二级结构C.三级结构D.四级结构E.五级结构蛋白质分子各亚基间的空间排布属于
某企业2019年年末资产总额为5000万元,负债总额为1766万元,则该企业2019年年末的权益乘数为()。
在项目建议书批准阶段或之前,各银行可以对符合贷款条件的项目出具贷款意向书,一般没有权限限制。()
面对消极腐败的东西,我们一定要提高警惕,做到见微知著、防微杜渐,从哲学上看是()。
物权从效力范围上看属于()。
在明朝,由刑部、大理寺和督察院组成的联合审判制度被称为()
InanOctober2008report,theCenterforDiseaseControlplacedtheU.S.29thininfantmortality.tiedwithSlovakiaandPola
树是结点的集合,它的根结点的数目是()。
Folktoysarethosewhosedesignshavepasseddownthroughthegenerations,madebyhandandnotinfactories.【C1】______manufact
最新回复
(
0
)