《自然》[Nature]13年4月11日出版pdf全文

nero1981

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) H  m% A) y; P  Q% Y4 Z0 XAbout the cover
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Fossil dinosaur . G8 s( X! ]6 x- Q3 x. M8 |
embryos are extremely rare, and mainly restricted to the Late Cretaceous period. 2 z- X. p0 q. Y( Y6 }
Hence the interest in a newly uncovered bone bed of Lower Jurassic sauropodomorph
% B* ^8 H: [' F3 {8 Cembryos from China, which at about 190–197 million years old is the oldest 9 m; f0 C8 F( W* i
assemblage of such bones ever found. A three-year multinational programme of   x1 n8 m- p) a0 ?" N
excavation and research has yielded a treasure trove of embryonic bones, and the " h5 f4 z  |3 b8 A+ \
oldest known evidence of organic remains. Study of bones preserved at various
& B/ Y* y" O; Z, adevelopmental stages indicates that these large dinosaurs had a short incubation
+ C" S" S. |3 p+ b2 y8 Q* ntime and flexed their muscles while still in the egg, preparing the growing $ l. G7 K; D  x* p/ ?
skeleton for life in the outside world. On the cover, a coloured thin section of ' Z$ ?0 }, }% z: l
an embryonic femur showing its internal tissues and large marrow cavity. ( ]& N  K  `; Q/ S- Q
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昕昕

世界上那些最容易的事情中，拖延时间最不费力。  

marysyq

做对的事情比把事情做对重要。  

mk990

谢谢分享了!  

大小年

支持一下吧  

剑啸寒

干细胞治疗  

xuguofeng

我卷了~~~~~~~  

abc987

皮肤干细胞

再来一天

原来是这样  

狂奔的蜗牛

很有吸引力