Objective To compare the different time of administration of hCG affecting pregnancy rate of IUI. Methods A total of 189 infertile couples underwent 331 cycles of lUI with husband＇s sperm. They were separated into 3 ...Objective To compare the different time of administration of hCG affecting pregnancy rate of IUI. Methods A total of 189 infertile couples underwent 331 cycles of lUI with husband＇s sperm. They were separated into 3 groups according to the time of hCG administration in IUI： hCG 1-23 h （group A）; hCG 24-36 h （group B）; hCG 37-48 h （group C）. Results There were no statistical differences among 3 groups. None of the other relative factors, such as the female age, the different methods of ovulation and the cause of infertility, showed differences in pregnancy rate among 3 groups. Conclusion IUI can be performed any time after administration of hCG （1-48 h）.展开更多
Solid acid catalysts(SACs)have attracted continuous research interest in past years as they play a pivotal role in establishing environmentally friendly and sustainable catalytic processes for various chemical industr...Solid acid catalysts(SACs)have attracted continuous research interest in past years as they play a pivotal role in establishing environmentally friendly and sustainable catalytic processes for various chemical industries.Development of low-cost and efcient SACs applicable to diferent catalysis processes are of immense signifcance but still very challenging so far.Here,we report a new kind of SACs consisting of sulfonated carbon nanofbers that are prepared via incomplete carbonization of low-cost natural nanofbrous cellulose followed by sulphonation with sulfuric acid.Te prepared SACs feature nanofbrous network structures,high specifc surface area,and abundant sulfonate as well as hydroxyl and carboxyl groups.Remarkably,the nanofbrous SACs exhibit superior performance to the state-of-the-art SACs for a wide range of acid-catalyzed reactions,including dimerization of�-methylstyrene,esterifcation of oleic acid,and pinacol rearrangement.Te present approach holds great promise for developing new families of economic but efcient SACs based on natural precursors via scalable and sustainable protocols in the future.展开更多
文摘Objective To compare the different time of administration of hCG affecting pregnancy rate of IUI. Methods A total of 189 infertile couples underwent 331 cycles of lUI with husband＇s sperm. They were separated into 3 groups according to the time of hCG administration in IUI： hCG 1-23 h （group A）; hCG 24-36 h （group B）; hCG 37-48 h （group C）. Results There were no statistical differences among 3 groups. None of the other relative factors, such as the female age, the different methods of ovulation and the cause of infertility, showed differences in pregnancy rate among 3 groups. Conclusion IUI can be performed any time after administration of hCG （1-48 h）.
基金Shu-Hong Yu acknowledges the funding support from the National Natural Science Foundation of China(Grants 21431006,21761132008)the Foundation for Innovative Research Groups of the National Natural Science Foundation of China(Grant 21521001)+8 种基金Key Research Program of Frontier Sciences,CAS(Grant QYZDJ-SSW-SLH036)the Users with Excellence and Scientifc Research Grant of Hefei Science Center of CAS(2015HSC-UE007)Hai-Wei Liang is thankful for the support by“the Recruitment Program of Global Experts,”National Natural Science Foundation of China(Grant 21671184)the Fundamental Research Funds for the Central Universities(Grant WK2340000076)Zhen-Yu Wu acknowledges the funding support from the National Postdoctoral Program for Innovative Talents(Grant BX201600142)the China Postdoctoral Science Foundation(Grant 2017M610383)the Fundamental Research Funds for the Central Universities(Grant WK2060190077)the National Natural Science Foundation of China(Grant 21703229)This work was partially carried out at the USTC Center for Micro and Nanoscale Research and Fabrication.
文摘Solid acid catalysts(SACs)have attracted continuous research interest in past years as they play a pivotal role in establishing environmentally friendly and sustainable catalytic processes for various chemical industries.Development of low-cost and efcient SACs applicable to diferent catalysis processes are of immense signifcance but still very challenging so far.Here,we report a new kind of SACs consisting of sulfonated carbon nanofbers that are prepared via incomplete carbonization of low-cost natural nanofbrous cellulose followed by sulphonation with sulfuric acid.Te prepared SACs feature nanofbrous network structures,high specifc surface area,and abundant sulfonate as well as hydroxyl and carboxyl groups.Remarkably,the nanofbrous SACs exhibit superior performance to the state-of-the-art SACs for a wide range of acid-catalyzed reactions,including dimerization of�-methylstyrene,esterifcation of oleic acid,and pinacol rearrangement.Te present approach holds great promise for developing new families of economic but efcient SACs based on natural precursors via scalable and sustainable protocols in the future.
