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 have the answer, and it comes down to the structure of the
Why does cream go bad faster than butter? Some researchers think they have the answer, and it comes down to the structure of the
admin
2015-01-15
24
问题
Why does cream go bad faster than butter? Some researchers think they have 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(密封舱)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 significance of Brocklehurst’s research is that______.
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
依据是文章第一段的内容。
转载请注明原文地址:https://kaotiyun.com/show/iehi777K
0
在职申硕(同等学力)英语
相关试题推荐
What’syourearliestchildhoodmemory?Canyourememberlearningtowalk?Ortalk?Thefirsttimeyou【C1】______thunderorwatche
Revengeisoneofthosethingsthateveryoneenjoys.Peopledon’tliketotalkaboutit,though.Justthesame,thereisnothing
Whatdoestheauthorthinkofthewords"civilization"and"culture"?Accordingtotheauthortheword"civilization"originall
JohnGrishamwasbornonFebruary2,1955,inJonesboro,Arkansas,intheUSA.Hisfatherwasaconstructionworkerandmovedhi
X-raysarealsocalledRontgenrays______thediscovererwhofirstputthemtouse.
Confucius—astatesman,scholar,and(educator)of(greatskill)andreputation-isgenerallyheldtobeChina’s(greatest)andmo
BenMickle,MattEdwards,andKshipraBhawalkarlookedasthoughtheyhadjustemergedfromaminorautowreck.ThemembersofD
BenMickle,MattEdwards,andKshipraBhawalkarlookedasthoughtheyhadjustemergedfromaminorautowreck.ThemembersofD
Anytroopofwildanimalsshouldbeapproachedwarily.
(Allof)theplantsnow(raised)onfarms(havebeen)developedfromplants(oncegrew)wild.
随机试题
我国最早在现代意义上使用“课程”这一术语的教育家是_______。
成年人门脉高压继发食管胃底静脉破裂大出血后,最易导致的严重并发症是
下列选项中,哪种氨基酸能转变为儿茶酚胺
风袭经络所致太阳经头痛的治疗配穴处方应选
根据国有资产法律制度的规定,国有金融企业可以对相关的资产不进行资产评估,下列不属于此类情形的是()。
(2012年真题)简述民事法律行为的含义和特征。
进度安排的常用图形描述方法有Gantt图和PERT图。Gantt图不能清晰地描述(18);PERT图可以给出哪些任务完成后才能开始另一些任务。下图所示的PERT图中,事件6的最晚开始时刻是(19)。(18)
Wherearethespeakers?
English______inidioms,andsodoesChinese.
Thebiosphereisthenamebiologistsgivetothesortofskinonthesurfaceofthisplanetthatisinhabitablebylivingorgani
最新回复
(
0
)