有些动物为何能更长寿-凯发k8官网

有些动物为何能更长寿

文章来源：未知文章作者：enread 发布时间：2012-03-30 03:17 字体： [ ]　

(单词翻译:双击或拖选)

scientists at the university of liverpool have developed a new method to detect proteins associated with ¹, which helps further our understanding into why some animals live longer than others. the team looked at the genome of more than 30 mammalian（哺乳类） species to identify proteins that evolve in connection with the longevity of a species. they found that a protein, important in responding to ² damage, evolves and mutates in a non-random way in species that are longer-lived, suggesting that it is changing for a specific purpose. they found a similar pattern in proteins associated with ³, ⁴（胆固醇） and pathways involved in the recycling of proteins.

findings show that if certain proteins are being selected by evolution to change in long-lived mammals like humans and elephants, then it is possible that these species have ⁵ pathways that repair ⁶ damage, compared to shorter-lived animals, such as mice.

the study, led by dr joao pedro magalhaes and ⁷ student, yang li, is the first to show ⁸ patterns in biological repair systems in long-lived animals and could, in the future, be used to help develop anti-aging ⁹ by identifying proteins in long-lived species that better respond to, for example, dna damage. proteins associated with the ¹⁰ of damaged proteins, a process that has been connected to aging, were also linked with the evolution of longevity in mammals.

dr magalhaes, from the university's institute of integrative biology, said: "the ¹¹ basis for longevity differences between species ¹² a major puzzle of biology. a mouse lives less than five years and yet humans can live to over 100 for example. if we can identify the proteins that allow some species to live longer than others we could use this knowledge to improve human health and slow the aging process.

"we developed a method to detect proteins whose molecular evolution correlates with longevity of a species. the proteins we detected changed in a particular pattern, suggesting that evolution of these proteins was not by accident, but rather by design to cope with the biological processes impacted by aging, such as dna damage. the results suggest that long-lived animals were able to optimise bodily repair which will help them ¹³ off the aging process."

the research is published in the american aging association's journal, age.

点击

收听单词发音

1
n.长命；长寿
参考例句：
good habits promote longevity.良好的习惯能增长寿命。 human longevity runs in families.人类的长寿具有家族遗传性。

2
(缩)deoxyribonucleic acid 脱氧核糖核酸
参考例句：
dna is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。 gene mutations are alterations in the dna code.基因突变是指dna密码的改变。

3
n.新陈代谢
参考例句：
after years of dieting,carol's metabolism was completely out of whack.经过数年的节食，卡罗尔的新陈代谢完全紊乱了。 all living matter undergoes a process of metabolism.生物都有新陈代谢。

4
n.（u）胆固醇
参考例句：
there is cholesterol in the cell of body.人体细胞里有胆固醇。 they are determining the serum-protein and cholesterol levels.他们正在测定血清蛋白和胆固醇的浓度。

5
adj.最佳化的，（使）最优化的v.使最优化，使尽可能有效( optimize的过去式和过去分词 )
参考例句：
we are often asked whether consumer web sites should be optimized for beginners or intermediates. 我们常常被问到这样的问题：消费类网站究竟应该为新手而优化，还是应该为中间用户而优化？来自about face 3交互设计精髓 google advertising optimized sequence, greatly increasing the advertising effect. 优化了google广告位排列顺序，大大增加了广告效果。来自互联网

6
adj.分子的；克分子的
参考例句：
the research will provide direct insight into molecular mechanisms.这项研究将使人能够直接地了解分子的机理。 for the pressure to become zero, molecular bombardment must cease.当压强趋近于零时，分子的碰撞就停止了。

7
adj.大学毕业后的，大学研究院的；n.研究生
参考例句：
i didn't put down that i had postgraduate degree.我没有写上我有硕士学位。 after college,mary hopes to do postgraduate work in law school.大学毕业后，玛丽想在法学院从事研究工作。

8
adj.进化的；演化的，演变的；[生]进化论的
参考例句：
life has its own evolutionary process.生命有其自身的进化过程。 these are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。

9
n.介入，干涉，干预( intervention的名词复数 )
参考例句：
economic analysis of government interventions deserves detailed discussion. 政府对经济的干预应该给予充分的论述。来自辞典例句 the judge's frequent interventions made a mockery of justice. 法官的屡屡干预是对正义的践踏。来自互联网

10
n.降级；低落；退化；陵削；降解；衰变
参考例句：
there are serious problems of land degradation in some arid zones.在一些干旱地带存在严重的土地退化问题。 gambling is always coupled with degradation.赌博总是与堕落相联系。

11
adj.遗传的，遗传学的
参考例句：
it's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。 each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。

12
n.剩余物，残留物；遗体，遗迹
参考例句：
he ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。 the remains of the meal were fed to the dog.残羹剩饭喂狗了。

13
v.照料（自己），（自己）谋生，挡开，避开
参考例句：
i've had to fend for myself since i was 14.我从十四岁时起就不得不照料自己。 he raised his arm up to fend branches from his eyes.他举手将树枝从他眼前挡开。