[目的]研究不同的胚龄、移植季节以及胚胎数量对转人乳铁蛋白基因（hLF）体细胞克隆山羊生产效率的影响.[方法]用奶山羊的转hLF基因成纤维细胞为供体细胞生产克隆胚胎,并以不同的胚龄、胚胎数量,在不同的季节移植给同期的受体山羊.[结果...[目的]研究不同的胚龄、移植季节以及胚胎数量对转人乳铁蛋白基因（hLF）体细胞克隆山羊生产效率的影响.[方法]用奶山羊的转hLF基因成纤维细胞为供体细胞生产克隆胚胎,并以不同的胚龄、胚胎数量,在不同的季节移植给同期的受体山羊.[结果]移植1细胞期和2-8细胞期胚胎受体羊的妊娠率（分别是17.95%和28.57%）、产羔率（分别是12.82%和14.29%）显著高于移植桑椹胚、囊胚的受体羊（3.70%和0,P〈0.05）;转hLF基因克隆胚胎在秋季移植效率最高,虽然秋季和春季受体羊妊娠率（分别是19.57%和18.18%）与冬季（10.34%）差异不显著,但秋季受体羊产羔率（13.04%）显著高于冬季（1.72%,P〈0.05）;虽然移植10-20枚克隆胚胎的受体羊妊娠率（18.18%）显著高于移植5-9枚胚胎的受体羊（7.89%）,但是由于其流产率高,两者产羔率差异并不显著（7.89% vs 6.36%,P〉0.05）.[结论]转基因克隆山羊胚胎移植试验的最适季节是秋季,最好移植激活后体外培养2 d内的胚胎.展开更多
Phylogenetic diversity of Form I and Form II ribulose1, 5-bisphosphate carboxylase/oxygenase (RubisCO) largesubunit (rbcL) genes in the inshore and offshore areas of the East China Sea were investigated. Two new prime...Phylogenetic diversity of Form I and Form II ribulose1, 5-bisphosphate carboxylase/oxygenase (RubisCO) largesubunit (rbcL) genes in the inshore and offshore areas of the East China Sea were investigated. Two new primer setswere designed for amplifying partial sequences of rbcL genes from Proteobacteria. Four rbcL gene clone libraries wereconstructed by amplification and cloning of approximately 640~800 bp sequences of bacterioplankton populations.The method of screening library by denaturing gradient gel electrophoresis (DGGE) was introduced. The resultsshow that the diversity of Form I is higher in offshore waters with higher salinity and lower productivity, while thatof Form II is higher at the inshore station where salinity is lower and productivity is higher. Several clusters ofsequences obtained are deeply rooted and show low similarity (60%~78%) to the known rbcL in existing databases.The degree of diversity of rbcL genes is directly related to environmental variables, including temperature, salinity,pH, dissolved oxygen, etc. These results indicate that rbcL gene can be used as an effective indicator for geneticdiversity and population variability of bacterioplankton with the ability of carbon dioxide fixation in the sea.展开更多
文摘[目的]研究不同的胚龄、移植季节以及胚胎数量对转人乳铁蛋白基因（hLF）体细胞克隆山羊生产效率的影响.[方法]用奶山羊的转hLF基因成纤维细胞为供体细胞生产克隆胚胎,并以不同的胚龄、胚胎数量,在不同的季节移植给同期的受体山羊.[结果]移植1细胞期和2-8细胞期胚胎受体羊的妊娠率（分别是17.95%和28.57%）、产羔率（分别是12.82%和14.29%）显著高于移植桑椹胚、囊胚的受体羊（3.70%和0,P〈0.05）;转hLF基因克隆胚胎在秋季移植效率最高,虽然秋季和春季受体羊妊娠率（分别是19.57%和18.18%）与冬季（10.34%）差异不显著,但秋季受体羊产羔率（13.04%）显著高于冬季（1.72%,P〈0.05）;虽然移植10-20枚克隆胚胎的受体羊妊娠率（18.18%）显著高于移植5-9枚胚胎的受体羊（7.89%）,但是由于其流产率高,两者产羔率差异并不显著（7.89% vs 6.36%,P〉0.05）.[结论]转基因克隆山羊胚胎移植试验的最适季节是秋季,最好移植激活后体外培养2 d内的胚胎.
基金This work was supported by the National Natural Science Foundation of China(NSFC)under project contract Nos 40232021,40176037 and 30170189the Ministry of Science and Technology of China(MOST)under project contract Nos 2003AA635160,2003DF000040,G2000078500 and,2001CB409700.
文摘Phylogenetic diversity of Form I and Form II ribulose1, 5-bisphosphate carboxylase/oxygenase (RubisCO) largesubunit (rbcL) genes in the inshore and offshore areas of the East China Sea were investigated. Two new primer setswere designed for amplifying partial sequences of rbcL genes from Proteobacteria. Four rbcL gene clone libraries wereconstructed by amplification and cloning of approximately 640~800 bp sequences of bacterioplankton populations.The method of screening library by denaturing gradient gel electrophoresis (DGGE) was introduced. The resultsshow that the diversity of Form I is higher in offshore waters with higher salinity and lower productivity, while thatof Form II is higher at the inshore station where salinity is lower and productivity is higher. Several clusters ofsequences obtained are deeply rooted and show low similarity (60%~78%) to the known rbcL in existing databases.The degree of diversity of rbcL genes is directly related to environmental variables, including temperature, salinity,pH, dissolved oxygen, etc. These results indicate that rbcL gene can be used as an effective indicator for geneticdiversity and population variability of bacterioplankton with the ability of carbon dioxide fixation in the sea.
