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
63
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
BIGFOOTTherearesomepeoplewhobelieveintheexistenceexistenceofBigfoot,EXISTa【C1】______ape-likecreatu
BIGFOOTTherearesomepeoplewhobelieveintheexistenceexistenceofBigfoot,EXISTa【C1】______ape-likecreatu
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
Youaregoingtoreadamagazinearticleaboutanartistwhopaintsflowers.Forquestions8-14,choosetheanswer(A,B,CorD
Youmustanswerthisquestion.1.SomeBritishpeoplearecomingtoyourareaandyouhavebeenaskedtohelporganisethegroup
Youmustanswerthisquestion.1.YourEnglishfriend,Bill,isatravelwriterandherecentlyvisitedatownwhichyouknowwe
ANEWCRUISESHIPOneofthebiggestpassengershipsinhistory,theIslandPrincess,carriespeopleoncruisesaroundtheCa
ANEWCRUISESHIPOneofthebiggestpassengershipsinhistory,theIslandPrincess,carriespeopleoncruisesaroundtheCa
ANEWCRUISESHIPOneofthebiggestpassengershipsinhistory,theIslandPrincess,carriespeopleoncruisesaroundtheCa
Theexaminerasksyoutotalkaboutsomethingtogetherandgivesyouadrawingtohelpyou.
随机试题
下列关于即期利率与远期利率的说法,不正确的是()。
某医学院骨科医生给聋哑患者做腰椎手术,术中需要患者反馈感受。因患者不会手语并不识字,医生使用了手绘的腰椎疼痛区域分布图及疼痛表达图形,与患者进行十几次“对话”,顺畅准确。这种沟通方式
32岁经产妇,孕38+2周,临产3小时,检查:宫缩强,宫口开大4cm,自然破膜并出现烦躁、呛咳、呼吸困难、发绀,血压60/30mmHg。最先考虑
影响需求价格弹性的因素有()
关于企业承包方式的选择,下列说法错误的是( )。
下列利用数理统计指标来衡量风险大小的说法,不正确的有()。
从所给四个选项中,选择最合适的一个填人问号处,使之呈现一定的规律性:
2015年广西全面铺开推行政府部门()制度工作,加快形成权界清晰、分工合理、权责一致、运行高效、法治保障的政府职能体系。
计算并填写下表。
针对PowerPoint幻灯片中图片对象的操作,描述错误的是()。
最新回复
(
0
)