| 3 | Applying bases for 'double control' artificial breeding of giant panda in captivity显示文摘THE giant panda is a kind of endangered rare animal,the number of which is less than onethousand at present,specially distributed in China.According to the protective scheme issuedby The International Association of Nature Protection,stock population in captivity must | Chen, DY Song, XF Duan, CW Li, MW Sun, QY Liu, H Zhang, AJ Ye, ZY Li, SC Li, GH Yu, JQ Zhang, FX Feng, WH Zhong, SL He, GX Song, YF Fei, LS | 1997 | Chinese Science Bulletin1997，42，9： | 1 |
| 6 | Subzonal insemination with primary spermatocytes in mouse显示文摘IT is well known that oocytes, in general condition, can be penetrated by sperm rather thanround spermatids. In 1993, Ogura injected round spermatid nuclei into hamster oocytes anddemonstrated that the spermatid nuclei could transform into pronuclei with DNA synthesis andthat their chromosomes mingled with oocyte chromosomes immediately. In order to avoid themechanical damage to the oocytes, an alternative method, cell-to-cell fusion, was used. Ap-proximately 20%—40% and 30% of round spermatids could be fused with oocytes by | Liu, L Sun, QY Duan, CW Liu, H Song, XF Qian, JF Chen, DY | 1997 | Chinese Science Bulletin1997，42，15： | 0 |
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