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测定卵裂球X染色体连锁基因剂量鉴别小鼠胚胎性别 被引量:2
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作者 m.monk 黄国清 《国外畜牧科技》 1989年第6期14-15,共2页
将8-细胞小鼠胚胎除丢透明带,从中取出一个卵裂球,然后测定其与X染色体连锁的次黄嘌呤磷酸核糖基转移酶(Hypoxanthinephosphoribosyl transferase,HPRT)和与常染色体连锁的腺嘌呤磷酸核糖基转移酶(Adenine phosphoribosyl transferase,A... 将8-细胞小鼠胚胎除丢透明带,从中取出一个卵裂球,然后测定其与X染色体连锁的次黄嘌呤磷酸核糖基转移酶(Hypoxanthinephosphoribosyl transferase,HPRT)和与常染色体连锁的腺嘌呤磷酸核糖基转移酶(Adenine phosphoribosyl transferase,APRT)的活性,由于在8-细胞阶段,雌性胚胎中的两条X染色体均有活性,因此,可根据HPRT活性在基因剂量上的二倍差异,得到HPRT与APRT比率的双态分布图,而鉴别出雄性和雌性胚胎(?)将几批用这种方法鉴别了性别的胚胎移植到假孕受体小鼠子宫内。结果,其中八分之七胚胎的发育与对照组去了透明带的完整胚胎的发育相一致。通过测是X连锁基因剂量鉴别胚胎性别不仅准确,而且快速,要鉴别性别的胚胎移植前不需低温保存等待鉴别结果。 展开更多
关键词 小鼠 胚胎 性别 鉴别 染色体 基因
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Search for the rare decays W^(+)→D_(s)^(+)γ and Z→D^(0)γ at LHCb 被引量:1
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作者 R.Aaij A.S.W.Abdelmotteleb +1069 位作者 C.Abellan Beteta F.Abudinén T.Ackernley B.Adeva M.Adinolfi P.Adlarson H.Afsharnia C.Agapopoulou C.A.Aidala Z.Ajaltouni S.Akar K.Akiba J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche P.Alvarez Cartelle R.Amalric S.Amato J.L.Amey Y.Amhis L.An L.Anderlini M.Andersson A.Andreianov M.Andreotti D.Andreou D.Ao F.Archilli A.Artamonov M.Artuso E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back A.Bailly-reyre P.Baladron Rodriguez V.Balagura W.Baldini J.Baptista de Souza Leite M.Barbetti R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay A.Beck M.Becker F.Bedeschi I.B.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Benane G.Bencivenni E.Ben-Haim A.Berezhnoy R.Bernet S.Bernet Andres D.Berninghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker N.V.Biesuz S.Bifani P.Billoir A.Biolchini M.Birch F.C.R.Bishop 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A search for the rare decays W^(+)→D_(s)^(+)γ and Z→D0γis performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13TeV,corresponding to an integrated luminosity... A search for the rare decays W^(+)→D_(s)^(+)γ and Z→D0γis performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13TeV,corresponding to an integrated luminosity of 2.0fb−1.No significant signal is observed for either decay mode and upper limits on their branching fractions are set using W^(+)→D_(s)^(+)γ and Z→μ+μ−decays as normalization channels.The upper limits are 6.5×10^(−4) and 2.1×10^(−3) at 95% confidence level for the W^(+)→D_(s)^(+)γ and Z→D^(0)γ decay modes,respectively.This is the first reported search for the Z→D^(0)γ decay,while the upper limit on the W+→D+sγbranching fraction improves upon the previous best limit. 展开更多
关键词 W/Z boson rare decay upper limit of branching fraction
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