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
Why does cream go bad faster than butter? Some researchers think they found the answer, and it comes down to the structure of th
Why does cream go bad faster than butter? Some researchers think they found the answer, and it comes down to the structure of th
admin
2011-01-05
52
问题
Why does cream go bad faster than butter? Some researchers think they found 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 colonies 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.
The word" colonies" refers to ______。
选项
A、tiny globules
B、watery regions
C、bacteria communities
D、little compartments
答案
C
解析
colony原意为“聚居地”,这里指细菌的聚集区。
转载请注明原文地址:https://kaotiyun.com/show/cYmd777K
本试题收录于:
职称英语卫生类A级题库职称英语分类
0
职称英语卫生类A级
职称英语
相关试题推荐
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
Writeananswertooneofthequestions2-4inthispart.Writeyouranswerin120-180wordsinanappropriatestyle.2.Yourte
Youaregoingtoreadamagazinearticleaboutanartistwhopaintsflowers.Forquestions8-14,choosetheanswer(A,B,CorD
Youaregoingtoreadamagazinearticleaboutanartistwhopaintsflowers.Forquestions8-14,choosetheanswer(A,B,CorD
Youaregoingtoreadanextractfromanovel.Forquestions7-13,choosetheanswer(A,B,CorD)whichyouthinkfitsbestac
Theexaminerasksyoutotalkaboutsomethingtogetherandgivesyouadrawingtohelpyou.
Theexaminerasksyoutotalkaboutsomethingtogetherandgivesyouadrawingtohelpyou.
随机试题
试述原因和结果辩证关系的原理及其意义。
不符合散发性甲低患儿体态特点的是
A.为改善环境使之适合于保护口腔健康或使行为有利于口腔健康所采取的各种行政干预、经济支持和组织保证等措施B.属于街道居民区、乡村及社会团体与单位的活动,旨在使人们提高对口腔健康的认识,引起兴趣,产生强烈的口腔健康愿望C.致力于帮助并鼓励人们有达到健康状
A、静脉滴注541液(以第一个24小时计)2000—3000rnlB、静脉滴注54l液(以第一个24小时计)3000~4000mlC、静脉滴注541液(以第一个24小时计)4000—8000m1D、静脉滴注541液(以第一个
关于药物水解反应的叙述正确的是
煤矿特种作业人员操作资格证书的颁发管理机关是()。
改革评价方式是基础教育课程改革的目标之一,其核心价值取向是()。
下列哪一项不属于法律原则在法律适用中的作用?()
某单位2011年招聘了65名毕业生,拟分配到该单位的7个不同部门。假设行政部门分得的毕业生人数比其他部门都多,问行政部门分得的毕业生人数至少为多少名?
平均而言,今天受过教育的人的读书时间明显少于50年前受过教育的人读书时间。但是,现在每年的书籍销售册数却比50年前增加了很多。以下各项陈述都有助于解析上述现象,除了
最新回复
(
0
)