Five new monoterpenoid glycosides named ligurobustosides E (1), F (2), I (3), J (4) and K (5) were isolated from the leaves of Ligustrum robustum. Their structures were established by spectroscopic and chemical methods.
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 N...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展开更多
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 nucle...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展开更多
文摘Five new monoterpenoid glycosides named ligurobustosides E (1), F (2), I (3), J (4) and K (5) were isolated from the leaves of Ligustrum robustum. Their structures were established by spectroscopic and chemical methods.
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
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
