This paper proposes a Mach Zehnder/Fabry Perot Interferometer(MZI/FPI)fiber sensor based on Single-mode Fiber(SMF)and Hollow-core Fiber(HCF),which has high sensitivity to temperature and lateral loads.The proposed dev...This paper proposes a Mach Zehnder/Fabry Perot Interferometer(MZI/FPI)fiber sensor based on Single-mode Fiber(SMF)and Hollow-core Fiber(HCF),which has high sensitivity to temperature and lateral loads.The proposed device consists of two single-mode fiber cones formed by manually controlling the fusion splicer and an air cavity formed by fusing a section of hollow-core fiber.The structure of the sensor is a double cone cascaded air cavity.At the beginning of the design,we compared the basic transmission spectra of single cone structure and double cone structure experimentally,and therefore chose to use double cone structure and air cavity cascade.Light undergoes its first reflection at the first interface between the single-mode fiber and the air cavity structure,and its second reflection at the second interface between the air cavity structure and the single-mode fiber.The two reflected light waves produced by the two reflections form FP interference,which can be used to measure lateral loads.The transmitted light is excited through the first cone,and a portion of the core mode light is excited to the cladding,while another portion of the core mode light continues to propagate in the core.The light couples at the second cone,and the cladding mode light couples back into the core,forming MZ interference with the core mode light,which can be used to measure temperature.The use of hollow-core fiber to form an air cavity has little effect on transmitted light,while avoiding the problem of crosstalk in dual parameter measurements.By designing temperature and lateral load experiments,this article verifies the sensitivity characteristics of this sensor to temperature and lateral loads.A significant redshift phenomenon was observed in the temperature experiment.A significant redshift phenomenon also occurred in the lateral load experiment.Through wavelength demodulation,the experimental results show that the wavelength sensitivity of the sensor to temperature is 56.29 pm/℃in the range of 30℃to 80℃.The wavelength sensitivity of the sensor to lateral loads is 1.123 nm/N in the range of 0~5 N.In addition,we have prepared multiple sets of fiber optic sensors with this structure and conducted repeated experiments to verify that the sensing performance of this structure of fiber optic sensors for temperature and lateral load is relatively stable.Also,the different waist diameters of cones will have a certain impact on the transmission spectrum of MZ,while the length of the air cavity will also have a certain impact on the reflection spectrum of FP.This article lists some fiber optic sensors for dual parameter measurement of temperature and lateral load.Compared with the listed sensors,the fiber optic sensor proposed in this article has better sensitivity to temperature and lateral load.And the fiber optic sensor proposed in this article has a simple manufacturing process,low production cost,and good performance,which has certain prospects in scientific research and industrial production.展开更多
目的探讨大脑中央核心区(cerebral central core,CCC)高血压性脑出血的分型方法及其对选择手术入路的指导意义,并分析内镜手术疗效。方法回顾性分析54例CCC高血压性脑出血病人的临床资料,分为外侧型(n=32)、内侧型(n=18)和混合型(n=4)...目的探讨大脑中央核心区(cerebral central core,CCC)高血压性脑出血的分型方法及其对选择手术入路的指导意义,并分析内镜手术疗效。方法回顾性分析54例CCC高血压性脑出血病人的临床资料,分为外侧型(n=32)、内侧型(n=18)和混合型(n=4)。外侧型病人采用经外侧裂-岛叶入路内镜手术,内侧型病人采用经Kocher点-侧脑室额角入路内镜手术,混合型病人采用经Kocher点外侧额中回皮质造瘘入路。结果术后24 h复查头部CT显示脑实质血肿完全和近全清除52例(96.3%),大部分清除2例(3.7%);脑脊液循环通路恢复率94.4%。术后2周GCS评分较术前明显提高(P <0.05)。随访12~60个月,无死亡病例,无新发脑积水病人。结论对CCC高血压性脑出血,神经内镜手术是一种微侵袭而有效的方法,术前根据血肿影像学特点进行分型有利于选择合适的手术入路。展开更多
习近平总书记在全国高校思想政治工作会议上指出,高校各类课程与思政课程要同向同行育人。计算机辅助药物设计(Computer-aided drug design,CADD)作为药学专业课,同时也是多学科交叉的前沿领域,其课程思政教学研究必须紧步推进。文章结...习近平总书记在全国高校思想政治工作会议上指出,高校各类课程与思政课程要同向同行育人。计算机辅助药物设计(Computer-aided drug design,CADD)作为药学专业课,同时也是多学科交叉的前沿领域,其课程思政教学研究必须紧步推进。文章结合CADD课程教学的现状,论述了在CADD课程教学中引入思政教育的必要性和可行性,并对CADD课程教学中思政元素的挖掘进行了研究探索,有效帮助学生在掌握专业知识的同时提升综合素质,有助于为我国医药领域培育更多有理想、有道德、有文化、有纪律的青年力量。展开更多
DNA double-strand breaks are repaired through either non-homologous end joining(NHEJ) or homologous recombination repair(HRR) pathway.The well-characterized regulatory mechanisms of double-strand break repair(DSBR) ar...DNA double-strand breaks are repaired through either non-homologous end joining(NHEJ) or homologous recombination repair(HRR) pathway.The well-characterized regulatory mechanisms of double-strand break repair(DSBR) are mainly found at the level of complicated repair protein interactions and modifications.Regulation of DSBR at the transcriptional level was also reported.In this study,we found that DSBR can be regulated by miR-34a at the post-transcriptional level.Specifically,miR-34a,which can be activated by DNA damages,represses DSBR activities by impairing both NHEJ and HRR pathways in cultured cells.The repression is mainly through targeting the critical DSBR promoting factor SIRT1,as ectopically expressed SIRT1 without 3'-UTR can rescue the inhibitory roles of miR-34a on DSBR.Further studies demonstrate that SIRT1 conversely represses miR-34a expression.Taken together,our data show that miR-34a is a new repressor of DSBR and the mutual inhibition between miR-34a and SIRT1 may contribute to regulation of DNA damage repair.展开更多
基金National Natural Science Foundation of China(Nos.6207509,U2001601,61975084)the Jiangsu Provincial Key Research and Development Program(Nos.BE2022079,BE2022055-2)。
文摘This paper proposes a Mach Zehnder/Fabry Perot Interferometer(MZI/FPI)fiber sensor based on Single-mode Fiber(SMF)and Hollow-core Fiber(HCF),which has high sensitivity to temperature and lateral loads.The proposed device consists of two single-mode fiber cones formed by manually controlling the fusion splicer and an air cavity formed by fusing a section of hollow-core fiber.The structure of the sensor is a double cone cascaded air cavity.At the beginning of the design,we compared the basic transmission spectra of single cone structure and double cone structure experimentally,and therefore chose to use double cone structure and air cavity cascade.Light undergoes its first reflection at the first interface between the single-mode fiber and the air cavity structure,and its second reflection at the second interface between the air cavity structure and the single-mode fiber.The two reflected light waves produced by the two reflections form FP interference,which can be used to measure lateral loads.The transmitted light is excited through the first cone,and a portion of the core mode light is excited to the cladding,while another portion of the core mode light continues to propagate in the core.The light couples at the second cone,and the cladding mode light couples back into the core,forming MZ interference with the core mode light,which can be used to measure temperature.The use of hollow-core fiber to form an air cavity has little effect on transmitted light,while avoiding the problem of crosstalk in dual parameter measurements.By designing temperature and lateral load experiments,this article verifies the sensitivity characteristics of this sensor to temperature and lateral loads.A significant redshift phenomenon was observed in the temperature experiment.A significant redshift phenomenon also occurred in the lateral load experiment.Through wavelength demodulation,the experimental results show that the wavelength sensitivity of the sensor to temperature is 56.29 pm/℃in the range of 30℃to 80℃.The wavelength sensitivity of the sensor to lateral loads is 1.123 nm/N in the range of 0~5 N.In addition,we have prepared multiple sets of fiber optic sensors with this structure and conducted repeated experiments to verify that the sensing performance of this structure of fiber optic sensors for temperature and lateral load is relatively stable.Also,the different waist diameters of cones will have a certain impact on the transmission spectrum of MZ,while the length of the air cavity will also have a certain impact on the reflection spectrum of FP.This article lists some fiber optic sensors for dual parameter measurement of temperature and lateral load.Compared with the listed sensors,the fiber optic sensor proposed in this article has better sensitivity to temperature and lateral load.And the fiber optic sensor proposed in this article has a simple manufacturing process,low production cost,and good performance,which has certain prospects in scientific research and industrial production.
文摘目的探讨大脑中央核心区(cerebral central core,CCC)高血压性脑出血的分型方法及其对选择手术入路的指导意义,并分析内镜手术疗效。方法回顾性分析54例CCC高血压性脑出血病人的临床资料,分为外侧型(n=32)、内侧型(n=18)和混合型(n=4)。外侧型病人采用经外侧裂-岛叶入路内镜手术,内侧型病人采用经Kocher点-侧脑室额角入路内镜手术,混合型病人采用经Kocher点外侧额中回皮质造瘘入路。结果术后24 h复查头部CT显示脑实质血肿完全和近全清除52例(96.3%),大部分清除2例(3.7%);脑脊液循环通路恢复率94.4%。术后2周GCS评分较术前明显提高(P <0.05)。随访12~60个月,无死亡病例,无新发脑积水病人。结论对CCC高血压性脑出血,神经内镜手术是一种微侵袭而有效的方法,术前根据血肿影像学特点进行分型有利于选择合适的手术入路。
文摘习近平总书记在全国高校思想政治工作会议上指出,高校各类课程与思政课程要同向同行育人。计算机辅助药物设计(Computer-aided drug design,CADD)作为药学专业课,同时也是多学科交叉的前沿领域,其课程思政教学研究必须紧步推进。文章结合CADD课程教学的现状,论述了在CADD课程教学中引入思政教育的必要性和可行性,并对CADD课程教学中思政元素的挖掘进行了研究探索,有效帮助学生在掌握专业知识的同时提升综合素质,有助于为我国医药领域培育更多有理想、有道德、有文化、有纪律的青年力量。
基金supported by the National Basic Research Program of China (2011CB965203)the National Natural Science Foundation of China (31030026 and 31021091)
文摘DNA double-strand breaks are repaired through either non-homologous end joining(NHEJ) or homologous recombination repair(HRR) pathway.The well-characterized regulatory mechanisms of double-strand break repair(DSBR) are mainly found at the level of complicated repair protein interactions and modifications.Regulation of DSBR at the transcriptional level was also reported.In this study,we found that DSBR can be regulated by miR-34a at the post-transcriptional level.Specifically,miR-34a,which can be activated by DNA damages,represses DSBR activities by impairing both NHEJ and HRR pathways in cultured cells.The repression is mainly through targeting the critical DSBR promoting factor SIRT1,as ectopically expressed SIRT1 without 3'-UTR can rescue the inhibitory roles of miR-34a on DSBR.Further studies demonstrate that SIRT1 conversely represses miR-34a expression.Taken together,our data show that miR-34a is a new repressor of DSBR and the mutual inhibition between miR-34a and SIRT1 may contribute to regulation of DNA damage repair.
