《自然》[Nature]13年4月11日出版pdf全文

nero1981

4 z# w4 s1 d& r7 S
' H; g- W0 @2 s& K3 y ) d0 p0 I! a6 n5 n( k' k
  _" f; q4 x8 i- W6 h% z: B
About the cover
$ P. t  z. q! T1 c, v7 G0 l0 `/ h7 B$ t
Fossil dinosaur
; q+ v- D% B7 bembryos are extremely rare, and mainly restricted to the Late Cretaceous period. 8 i5 R4 C7 {3 P* X& _' |: p
Hence the interest in a newly uncovered bone bed of Lower Jurassic sauropodomorph : W& ~. [3 Q# T( R0 `+ ^( ~
embryos from China, which at about 190–197 million years old is the oldest 2 V+ f$ H' _$ z+ ^, h
assemblage of such bones ever found. A three-year multinational programme of " W0 l( b# R( e0 b
excavation and research has yielded a treasure trove of embryonic bones, and the   g  m/ {" a" S& o! C
oldest known evidence of organic remains. Study of bones preserved at various
1 L' b  G! I( Adevelopmental stages indicates that these large dinosaurs had a short incubation
- l! x3 `- F2 _' ?7 B+ ]2 @time and flexed their muscles while still in the egg, preparing the growing
  R) y  f% z2 ~) _skeleton for life in the outside world. On the cover, a coloured thin section of
; i9 A  ^- n4 p1 U1 z2 F  Y! `0 ?an embryonic femur showing its internal tissues and large marrow cavity. ( a+ L$ u/ Z) Y! H( t7 [# h0 q4 L

4 S# I* S$ F$ Z[hide][/hide]
$ f5 C5 f: z/ {2 e' N8 k' D; t8 E4 h1 l( X+ W
0 D" t7 f' D! u3 y# H# o* f

chongchong

勤奋真能造就财富吗？  

狂奔的蜗牛

不错啊! 一个字牛啊!  

dmof

挤在北京，给首都添麻烦了……  

丸子

慢慢来，呵呵  

tian2006

强人，佩服死了。呵呵，不错啊  

小丑的哭泣

支持一下吧  

leeking

感觉好像在哪里看过了，汗~  

dglove

说的真有道理啊！

lalala

皮肤干细胞