2015考研英语阅读压力和老化

　　Stress and ageing A question of attitude

　　压力和老化 一个态度问题

　　The link between chronic stress and a marker of old age is being disentangled

　　科学家发现了长期压力与一个衰老标志间的联系

　　TELOMERES are to chromosomes what plastic caps are to shoelacesthey stop them frayingat the ends.

　　端粒之于染色体，如同塑料帽之于鞋带它们阻止了其末端的磨损。

　　Unlike shoelaces, though, chromosomes replicate themselves from time to time as the cellsthey are in divide.

　　和鞋带不同的是，随着它们所在细胞的分裂，染色体可以不断进行复制。

　　This shortens the telomere and, after 50-70 such divisions ,

　　这种复制过程使端粒不断缩短，并且，在经过50到70次的细胞分裂后，

　　a chromosome can grow no shorter and the cell it is in can divide no more.

　　染色体的缩短达到极限，细胞分裂活动也从此终止。

　　That provides a backstop against cancer. The rapidly dividing cells in a tumour soon hit theHayflick limit and the process is brought to a screeching halt.

　　这一机制有助于对抗癌症。快速分裂的细胞不久就会到达其海弗利克界限，使得该过程能够急刹车。这是个好现象。

　　Which is a good thing. The bad thing is that reaching the limit is one of the markers of oldage.

　　不利之处则是，细胞到达复制次数的极限是老化的标志之一。

　　You do not want it to happen too quickly, particularly in tissues that have to do a lot ofdividing in order to work properly, such as those in the immune system.

　　人们不想让这个过程发生的太快，尤其对于那些需要不断分裂才能够得以正常运作的组织而言，例如免疫系统组织。

　　It has been known for some time that chronic stress causes premature shortening of the telomeres.

　　人们已经得知，长期的压力可以使端粒的缩短提前发生。

　　What has not been clear is whether this is a one-way trip, with each stressful period turningthe telomeric ratchet irreversibly.

　　然而人们对于该过程是否单向进行尚不明确。

　　This week, though, at a meeting of the American Association for Cancer Research in Orlando,Florida, a group of researchers led by Edward Nelson of the University of California, Irvine,showed that it isn t.

　　然而，本周在美国癌症研究学会于佛罗里达州奥兰多召开的会议上，加州大学尔文分校由爱德华?尼尔森领导的研究团队发现，这一过程是可逆的。

　　Their research suggests that stress management not only stops telomeres from shortening,it actually promotes their repair.

　　他们指出，抗压力训练不仅可以组织端粒缩短，也可以促进其修复。

　　Dr Nelson drew this welcome conclusion from a previous study that measured the impactof telephone counselling on women who had been treated for cervical cancer.

　　尼尔森博士通过对接受宫颈癌治疗的妇女电话咨询影响作用的研究，得出了这一可喜的结论。

　　The study found that such counselling worked, both mentally and physically.

　　他们之前的研究发现，咨询在心理和生理上都产生了作用。

　　Women who had been counselled reported that the quality of their lives had improved,compared with those of a control group who had not been counselled.

　　接受咨询的妇女报告其生活质量得到提高。

　　They also showed improvements in the strength of their immune systems.

　　她们还显示出免疫系统功能的增强。

　　Given those benefits, Dr Nelson wondered if he could find others, and he re-examined theparticipants samples to look at the lengths of the telomeres in their white blood cells .

　　由于咨询的上述益处，尼尔森博士想知道该研究是否能有更多的发现。他重新检查了被试的血液样本，试图获得白细胞端粒长度的信息。

　　What he found surprised him. Not only did counselling stop telomere shrinkage, it actuallypromoted telomere growth.

　　研究发现令他十分惊讶：咨询不仅阻止了端粒的缩短，同时促进了端粒的生长。

　　Those women for whom counselling had worked had longer telomeres at the end than they did at the beginning.

　　那些报告咨询产生效果的妇女其咨询后的端粒长度大于咨询前。

　　Their Hayflick countdowns were being reset.

　　她们的海弗利克倒计时得到了重新的设置。

　　A single such result must, of course, be treated with caution.

　　当然，我们应该谨慎看待单个研究的结论。

　　But another study reported at the meeting, by Elizabeth Blackburn of the University ofCalifornia, San Francisco , gave some support.

　　但该会议上另一个来自加州大学旧金山分校伊丽莎白?布莱克本的报告也给出了一些支持证据。

　　This showed that exercise has a similar effect to counselling on the telomeres of the stressed.

　　她们发现锻炼和咨询对压力个体的端粒有相似的作用。

　　If Dr Nelson s work is successfully replicated, it will shine more light on the ill-understoodrelationship between the health of the mind and the health of the body.

　　如果尼尔森博士的研究得到成功的重复，将会为理解神秘复杂的身心健康关系点燃新的希望。

　　For, as he points out, nothing actually changed in the lives of the women in question.

　　就像他所指出的那样，这些妇女的生活没有任何变化。

　　They still had cancer, albeit under treatment, and they were still under stress. Nothing, thatis, except their attitude.

　　尽管接受治疗，她们仍身患癌症，并处于压力之中。唯一改变的，就是她们的态度。