High-quality superconducting Ca_(1-x)Na_(x)Fe_(2)As_(2)single crystals have been successfully grown by the NaAs-flux method,with sodium doping level x=0.4–0.64.The typical sizes of these crystals are more than 10 mm ...High-quality superconducting Ca_(1-x)Na_(x)Fe_(2)As_(2)single crystals have been successfully grown by the NaAs-flux method,with sodium doping level x=0.4–0.64.The typical sizes of these crystals are more than 10 mm in ab-plane and~0.1 mm along c-axis in thickness.X-ray diffraction,resistance and magnetization measurements are carried out to characterize the quality of these crystals.While no signature of magnetic phase transitions is detected in the normal state,bulk superconductivity is found for these samples,with a sharp transition at T_(c) ranging from 19.8 K(x=0.4)to 34.8 K(x=0.64).The doping dependences of the c-axis parameter and T_(c) are consistent with previous reports,suggesting a possible connection between the lattice parameters and superconductivity.展开更多
Background： The Food and Drug Administration recently announced that the use of morcellation may cause fibroids or pelvic dissemination and metastasis of uterine sarcoma; therefore, the use of morcellation is limited...Background： The Food and Drug Administration recently announced that the use of morcellation may cause fibroids or pelvic dissemination and metastasis of uterine sarcoma; therefore, the use of morcellation is limited in the USA. A large sample study is necessary to assess the proportion of uterine malignant tumors found in patients with laparoscopic myomectomy. Methods： A national multicenter study was performed in China. From 2002 to 2014, 33,723 cases were retrospectively selected. We calculated the prevalence and recorded the clinical characteristics of the patients with malignancy after morcellation application. A total of 62 cases were finally pathologically confirmed as malignant postoperatively. Additionally, the medical records of the 62 patients were analyzed in details. Results： The proportion of postoperative malignancy after morcellation application was 0.18% （62/33,723） for patients who underwent laparoscopic myomectomy. Nearly 62.9% （39/62） of patients had demonstrated blood flow signals in the uterine fibroids before surgery. And, 23 （37.1%） patients showed rapid growth at the final preoperative ultrasound. With respect to the pathological types, 38 （61.3%） patients had detectable endometrial stromal sarcoma, 13 （21.0%） had detectable uterine leiomyosarcoma, only 3 （3.2%） had detectable carcinosarcoma, and 5 （8.1%） patients with leiomyoma had an undetermined malignant potential. Conclusions： The proportion of malignancy is low after using moreellation in patients who undergo laparoscopie myomectomy. Patients with fast-growing uterine fibroids and abnormal ultrasonic tumor blood flow should be considered for malignant potential, and morcellation should be avoided.展开更多
Objective To study the effects and the appropriate concentration of insulin on the development of mouse embryos in vitro, and the effects of insulin on the development of different stages of embryos.Methods Mouse embr...Objective To study the effects and the appropriate concentration of insulin on the development of mouse embryos in vitro, and the effects of insulin on the development of different stages of embryos.Methods Mouse embryos were cultured in vitro in the mKSOM media supplemented with insulin at different concentrations and with insulin during different stages of embryos. The blastoeyst rates and the cell numbers were counted.Results Additions of insulin significantly increased the rates of blastocyst and the total cell numbers. The concentrations of 0.005 μg/ml and 0.05 μg/ml insulin caused a significant increase in the total cell numbers compared with the control and experimental groups. Addition of insulin from 2-cell to 4-cell stage or from the 4-cell to morula stage, significantly increased the blastocyst rates compared with control and experi- mental groups.Conclusion Insulin can promote the development of mouse embryos in vitro. The appropriate concentration of insulin added in mKSOM was 0.005 μg/ml and 0.05μg/ml. Exposure of embryos to insulin, beginning at the 2-cell and extending to the 4-cell stage or beginning at the 4-cell and extending to the morula stage, is important for the development of lCR mouse embryos in vitro.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant No.2018YFA0704200)the National Natural Science Foundation of China(Grant Nos.11822411 and 11961160699)+4 种基金the Strategic Priority Research Program(B)of the CAS(Grants Nos.XDB25000000 and XDB33000000)the K.C.Wong Education Foundation(Grant No.GJTD-2020-01)the Youth Innovation Promotion Association of CAS(Grant No.Y202001)the Postdoctoral Innovative Talent program(Grant No.BX2021018)the China Postdoctoral Science Foundation(Grant No.2021M700250)。
文摘High-quality superconducting Ca_(1-x)Na_(x)Fe_(2)As_(2)single crystals have been successfully grown by the NaAs-flux method,with sodium doping level x=0.4–0.64.The typical sizes of these crystals are more than 10 mm in ab-plane and~0.1 mm along c-axis in thickness.X-ray diffraction,resistance and magnetization measurements are carried out to characterize the quality of these crystals.While no signature of magnetic phase transitions is detected in the normal state,bulk superconductivity is found for these samples,with a sharp transition at T_(c) ranging from 19.8 K(x=0.4)to 34.8 K(x=0.64).The doping dependences of the c-axis parameter and T_(c) are consistent with previous reports,suggesting a possible connection between the lattice parameters and superconductivity.
文摘Background： The Food and Drug Administration recently announced that the use of morcellation may cause fibroids or pelvic dissemination and metastasis of uterine sarcoma; therefore, the use of morcellation is limited in the USA. A large sample study is necessary to assess the proportion of uterine malignant tumors found in patients with laparoscopic myomectomy. Methods： A national multicenter study was performed in China. From 2002 to 2014, 33,723 cases were retrospectively selected. We calculated the prevalence and recorded the clinical characteristics of the patients with malignancy after morcellation application. A total of 62 cases were finally pathologically confirmed as malignant postoperatively. Additionally, the medical records of the 62 patients were analyzed in details. Results： The proportion of postoperative malignancy after morcellation application was 0.18% （62/33,723） for patients who underwent laparoscopic myomectomy. Nearly 62.9% （39/62） of patients had demonstrated blood flow signals in the uterine fibroids before surgery. And, 23 （37.1%） patients showed rapid growth at the final preoperative ultrasound. With respect to the pathological types, 38 （61.3%） patients had detectable endometrial stromal sarcoma, 13 （21.0%） had detectable uterine leiomyosarcoma, only 3 （3.2%） had detectable carcinosarcoma, and 5 （8.1%） patients with leiomyoma had an undetermined malignant potential. Conclusions： The proportion of malignancy is low after using moreellation in patients who undergo laparoscopie myomectomy. Patients with fast-growing uterine fibroids and abnormal ultrasonic tumor blood flow should be considered for malignant potential, and morcellation should be avoided.
文摘Objective To study the effects and the appropriate concentration of insulin on the development of mouse embryos in vitro, and the effects of insulin on the development of different stages of embryos.Methods Mouse embryos were cultured in vitro in the mKSOM media supplemented with insulin at different concentrations and with insulin during different stages of embryos. The blastoeyst rates and the cell numbers were counted.Results Additions of insulin significantly increased the rates of blastocyst and the total cell numbers. The concentrations of 0.005 μg/ml and 0.05 μg/ml insulin caused a significant increase in the total cell numbers compared with the control and experimental groups. Addition of insulin from 2-cell to 4-cell stage or from the 4-cell to morula stage, significantly increased the blastocyst rates compared with control and experi- mental groups.Conclusion Insulin can promote the development of mouse embryos in vitro. The appropriate concentration of insulin added in mKSOM was 0.005 μg/ml and 0.05μg/ml. Exposure of embryos to insulin, beginning at the 2-cell and extending to the 4-cell stage or beginning at the 4-cell and extending to the morula stage, is important for the development of lCR mouse embryos in vitro.
