某些物种不会随时间而衰老-凯发k8官网

某些物种不会随时间而衰老

文章来源：未知文章作者：enread 发布时间：2013-12-09 05:09 字体： [ ]　

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in our youth we are strong and healthy and then we weaken and die -- that's probably how most would describe what aging is all about. but, in nature, the phenomenon of aging shows an unexpected diversity of patterns and is altogether rather strange, conclude researchers from the university of southern denmark. not all species weaken and become more likely to die as they age. some species get stronger and less likely to die with age, while others are not ¹ by age at all. increasing weakness with age is not a law of nature.

researchers from the university of southern denmark have studied aging in 46 very different species including mammals, plants, ² and ³（藻类）, and they surprisingly find that there is a huge diversity in how different organisms age. some become weaker with age -- this applies to e.g. humans, other mammals, and birds; others become stronger with age -- this applies to e.g. tortoises and certain trees, and others become neither weaker nor stronger -- this applies to e.g. ⁴, a freshwater polyp（珊瑚虫，水螅虫）.

"many people, including scientists, tend to think that aging is ⁵ and occurs in all organisms on earth as it does for humans: that every species becomes weaker with age and more likely to die. but that is not the case," says ⁶ biologist and assistant professor owen jones from the max-planck odense center at the university of southern denmark .

he is the lead author of an article on the subject in the scientific journal nature. other authors are from the max planck institute for demographic research in rostock, germany, the university of queensland in australia, university of amsterdam in holland and elsewhere.

owen jones and his colleagues studied aging in species ranging from oak trees, nematodes（线虫）, ⁷（狒狒） and lice to seaweed and lions. the species included 11 mammals, 12 other vertebrates, 10 ⁸, 12 plants and one algae.

"the diversity of mortality and fertility patterns in these organisms surprised us, and there is clearly a need for more research before we ⁹ understand the evolutionary causes of aging and become better able to address problems of aging in humans," says owen jones.

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收听单词发音

1
adj.不自然的，假装的
参考例句：
she showed an affected interest in our subject.她假装对我们的课题感到兴趣。 his manners are affected.他的态度不自然。

2
n.真菌，霉菌
参考例句：
students practice to apply the study of genetics to multicellular plants and fungi.学生们练习把基因学应用到多细胞植物和真菌中。 the lawn was covered with fungi.草地上到处都是蘑菇。

3
n.水藻，海藻
参考例句：
most algae live in water.多数藻类生长在水中。 algae grow and spread quickly in the lake.湖中水藻滋蔓。

4
n.水螅；难于根除的祸患
参考例句：
let's knock down those hydras and drive them to the sea!让我们铲除祸根，把他们赶到大海去！ we may be facing a hydra that defies any easy solution.我们也许正面临一个无法轻易解决的难题。

5
adj.不可避免的，必然发生的
参考例句：
mary was wearing her inevitable large hat.玛丽戴着她总是戴的那顶大帽子。 the defeat had inevitable consequences for british policy.战败对英国政策不可避免地产生了影响。

6
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。

7
n.狒狒( baboon的名词复数 )
参考例句：
baboons could break branches and leaders. 狒狒会折断侧枝和顶梢。来自辞典例句 and as nonprimates, they provoke fewer ethical and safety-related concerns than chimps or baboons. 而且作为非灵长类，就不会产生像用黑猩猩或狒狒那样的伦理和安全方面的顾虑。来自英汉非文学 - 生命科学 - 医学的第四次革命

8
n.无脊椎动物( invertebrate的名词复数 )
参考例句：
insects and worms are all invertebrates. 昆虫和蠕虫都是无脊椎动物。来自辞典例句 in the earthworm and many other invertebrates, these excretory structures are called nephridia. 在蚯蚓和许多其它无脊椎动物中，这些排泄结构称为肾管。来自辞典例句

9
adv.完全地，全部地，彻底地；充分地
参考例句：
the doctor asked me to breathe in,then to breathe out fully.医生让我先吸气，然后全部呼出。 they soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。