首页
登录
职称英语
Why does cream go bad faster than butter? Some researchers think they have th
Why does cream go bad faster than butter? Some researchers think they have th
游客
2024-09-27
31
管理
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 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 buried deep in the sea of fat. Trapped in this way, individual colonies cannot spread and rapidly nm out of nutrients. They also slowly poison themselves with their waste products. "In butter, you get a serf-limiting system which stops the bacteria growing," says Brocklehurst.
The researchers already working with food companies keen to see if their products can be made resistant to bacterial attack flux)ugh 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. [br] 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 butut
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
根据第一段中第二句的后半部分“a finding...could help rid some processed foods of chemical preservatives",就可知答案为A 。
转载请注明原文地址:https://tihaiku.com/zcyy/3776577.html
相关试题推荐
Whydoescreamgobadfasterthanbutter?Someresearchersthinktheyhaveth
Whyaresomebabymilkcompanyaccused?[originaltext]Medicalresearchersha
ThenewLenovolaptopwiththebutterflykeyboardandthebuilt-inFAXmodemis
______enoughtimeandmoney,theresearcherswouldhavebeenabletodiscovermo
Linguisticresearchershavegraduallycometounderstandhowandwhysomany
Linguisticresearchershavegraduallycometounderstandhowandwhysomany
Linguisticresearchershavegraduallycometounderstandhowandwhysomany
Linguisticresearchershavegraduallycometounderstandhowandwhysomany
Linguisticresearchershavegraduallycometounderstandhowandwhysomany
Linguisticresearchershavegraduallycometounderstandhowandwhysomany
随机试题
A.{λ|λ∈R} B.{λ|λ∈R,λ≠-1} C.{λ|λ∈
三种可重复的基本颌位是A.牙尖交错位,侧方接触位,息止位 B.牙尖交错位,后退
试述早期妊娠的辅助诊断方法。
患者,男性,34岁,高热,右上腹疼痛5天,B超提示肝脓肿,曾有胆道感染病史。此患
下列各项中,不符合内部牵制的要求的是()。A、出纳人员管票据 B、出纳人员
A.鹿茸B.人参C.甘草D.白术E.淫羊藿可治疗阿狄森病的药物是
至少在中文世界,将儒家传统定性为一种“人文主义”,已经成为学界的_____,而视
中间业务相比于传统业务而言,具有的特点有()A:不运用或不直接运用银行的自有资金
下列各项中,属于管理层通过凌驾于控制之上实施舞弊的手段的有()。A.不恰当地调
利用水泥、沥青等胶结材料,将松散的废物胶结包裹起来,减少有害物质从废物中向外迁移
最新回复
(
0
)