PTE真题阅读训练:线粒体

随着PTE考生对PTE口语和PTE听力的重视,大家口语和听力的分数得到极大提高,但是PTE阅读渐渐成为

考生们新的难题。墨尔本悉尼文波PTE特别为PTE考生们挑选了适合练习PTE阅读的文章,主题,内容,长度都与PTE阅读题中的文章相似。激活学过的词汇,更新新的词汇,提高阅读速度,全面提升自己的阅读能力。

Whenever I see my 10-year-old daughter brimming over with so much energy that she jumps up in the middle of supper to run around the table, I think to myself, “those young mitochondria.”

Mitochondria are our cells’ energy dynamos. Descended from bacteria that colonized other cells about 2 billion years, they get flaky as we age. A prominent theory of aging holds that decaying of mitochondria is a key driver of aging. While it’s not clear why our mitochondria fade as we age, evidence suggests that it leads to everything from heart failure to neurodegeneration, as well as the complete absence of zipping around the supper table.

Recent research suggests it may be possible to reverse mitochondrial decay with dietary supplements that increase cellular levels of a molecule called NAD (nicotinamide adenine dinucleotide). But caution is due: While there’s promising test-tube data and animal research regarding NAD boosters, no human clinical results on them have been published.

NAD is a linchpin of energy metabolism, among other roles, and its diminishing level with age has been implicated in mitochondrial deterioration. Supplements containing nicotinamide riboside, or NR, a precursor to NAD that’s found in trace amounts in milk, might be able to boost NAD levels. In support of that idea, half a dozen Nobel laureates and other prominent scientists are working with two small companies offering NR supplements.

brim over:n.溢满;溢出

mitochondria:n.线粒体

dynamo:n.发电机

prominent:adj.杰出的

flaky:adj. 薄片的;古里古怪的

neurodegeneration:n. 神经退行性疾病

molecule:n.分子

NAD (nicotinamide adenine dinucleotide):n.辅酶;烟酰胺腺嘌呤二核苷酸

 

linchpin:n.轮辖;关键

metabolism:n. 新陈代谢

deterioration:n. 退化;恶化

nicotinamide riboside:n. 烟酰胺核糖

precursor:n. 先驱

laureate:n. 得奖者

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