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科学美国人60秒 SSS 古代海洋爬行动物拥有熟悉的装备

时间:2019-12-10 06:05:47

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(单词翻译)

 

This is Scientific American — 60-Second Science. I'm Christopher Intagliata.

Long before dolphins swam the seas, their near look-alike ichthyosaurs inhabited the earth's oceans. Now scientists say these ancient seafaring reptiles1 may have ha?????d more in common with modern-day sea turtles and marine2 mammals than we knew.

Over time, a dead animal's bones can be slowly replaced by minerals, leaving behind a rocky fossil. The researchers demineralized the 180-million-year-old fossil of an ichthyosaur...leaving them with soft, flexible tissues.

"Which is kind of amazing."

Johan Lindgren, a paleontologist at Lund University in Sweden. "It turns out that the skin, is still there, with cells and cellular3 organelles. And even traces of the original biomolecular makeup4."

Those remains5 revealed that the ichthyosaur sported camouflage6 appropriate for its underwater environment—light on the bottom, darker on top—like many marine animals have today.

The researchers also found a black, glossy7 substance that was harder to identify. So they collected dead sea turtles and porpoises8 and mimicked9 fossilization by heating and squashing the creatures' skin. Which led them to realize that that the darker substance in the ichthyosaur fossil must be blubber.

"So from having blubber we can say that, to some extent the ichthyosaurs must have been warm blooded, so to say. At least to the same degree as the modern leatherback turtle."

The write-up and photos of the fossil are in the journal Nature.

There's one more intriguing10 secret contained in the remains: proteinaceous material. Which makes you wonder if you sequenced it, could you go backwards11, and reconstruct the DNA12 that coded for the proteins?

In other words: (Jurassic Park clip: "Bingo... Dino DNA!)

Of course, ichthyosaurs were not dinosaurs13, but the Jurassic Park methodology is what's important. So, could we resurrect one starting from their protein sequences?

"Yeah well, perhaps. You should never say never!"

Thanks for listening for Scientific American — 60-Second Science. I'm Christopher Intagliata.


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1 reptiles 45053265723f59bd84cf4af2b15def8e     
n.爬行动物,爬虫( reptile的名词复数 )
参考例句:
  • Snakes and crocodiles are both reptiles. 蛇和鳄鱼都是爬行动物。 来自《简明英汉词典》
  • Birds, reptiles and insects come from eggs. 鸟类、爬虫及昆虫是卵生的。 来自《现代汉英综合大词典》
2 marine 77Izo     
adj.海的;海生的;航海的;海事的;n.水兵
参考例句:
  • Marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
  • When the war broke out,he volunteered for the Marine Corps.战争爆发时,他自愿参加了海军陆战队。
3 cellular aU1yo     
adj.移动的;细胞的,由细胞组成的
参考例句:
  • She has a cellular telephone in her car.她的汽车里有一部无线通讯电话机。
  • Many people use cellular materials as sensitive elements in hygrometers.很多人用蜂窝状的材料作为测量温度的传感元件。
4 makeup 4AXxO     
n.组织;性格;化装品
参考例句:
  • Those who failed the exam take a makeup exam.这次考试不及格的人必须参加补考。
  • Do you think her beauty could makeup for her stupidity?你认为她的美丽能弥补她的愚蠢吗?
5 remains 1kMzTy     
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。
6 camouflage NsnzR     
n./v.掩饰,伪装
参考例句:
  • The white fur of the polar bear is a natural camouflage.北极熊身上的白色的浓密软毛是一种天然的伪装。
  • The animal's markings provide effective camouflage.这种动物身上的斑纹是很有效的伪装。
7 glossy nfvxx     
adj.平滑的;有光泽的
参考例句:
  • I like these glossy spots.我喜欢这些闪闪发光的花点。
  • She had glossy black hair.她长着乌黑发亮的头发。
8 porpoises 223bb3a8f6402f66c6cab07736a435ff     
n.鼠海豚( porpoise的名词复数 )
参考例句:
  • A shoal of porpoises are well on the feed. 一群海豚正在吞食。 来自辞典例句
  • In 1928 some porpoises were photographed working like beavers to push ashore a waterlogged mattress. 1928年有人把这些海豚象海狸那样把一床浸泡了水的褥垫推上岸时的情景拍摄了下来。 来自辞典例句
9 mimicked mimicked     
v.(尤指为了逗乐而)模仿( mimic的过去式和过去分词 );酷似
参考例句:
  • He mimicked her upper-class accent. 他模仿她那上流社会的腔调。 来自辞典例句
  • The boy mimicked his father's voice and set everyone off laughing. 男孩模仿他父亲的嗓音,使大家都大笑起来。 来自辞典例句
10 intriguing vqyzM1     
adj.有趣的;迷人的v.搞阴谋诡计(intrigue的现在分词);激起…的好奇心
参考例句:
  • These discoveries raise intriguing questions. 这些发现带来了非常有趣的问题。
  • It all sounds very intriguing. 这些听起来都很有趣。 来自《简明英汉词典》
11 backwards BP9ya     
adv.往回地,向原处,倒,相反,前后倒置地
参考例句:
  • He turned on the light and began to pace backwards and forwards.他打开电灯并开始走来走去。
  • All the girls fell over backwards to get the party ready.姑娘们迫不及待地为聚会做准备。
12 DNA 4u3z1l     
(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。
13 dinosaurs 87f9c39b9e3f358174d58a584c2727b4     
n.恐龙( dinosaur的名词复数 );守旧落伍的人,过时落后的东西
参考例句:
  • The brontosaurus was one of the largest of all dinosaurs. 雷龙是所有恐龙中最大的一种。 来自《简明英汉词典》
  • Dinosaurs have been extinct for millions of years. 恐龙绝种已有几百万年了。 来自《简明英汉词典》

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