The light curve analyses and orbital period variations for two contact binary stars,LS Del and V997 Cyg,are presented in this work which was conducted in the frame of the Binary Systems of South and North project Grou...The light curve analyses and orbital period variations for two contact binary stars,LS Del and V997 Cyg,are presented in this work which was conducted in the frame of the Binary Systems of South and North project Ground-based photometric observations were performed at two observatories in France.We used the Transiting Exoplanet Survey Satellite(TESS)data for extracting times of minima and light curve analysis of the targe systems.The O-C diagram for both systems displays a parabolic trend.LS Del and V997 Cyg’s orbital periods are increasing at rates of dP/dt=7.20×10^(-08)days yr^(-1)and dP/dt=2.54×10^(-08)days yr^(-1),respectively Therefore,it can be concluded that mass is being transferred from the less massive star to the more massive component with a rate of dM/dt=-1.96×10^(-7)M_(⊙)yr^(-1)for the LS Del system,and dM/dt=-3.83×10^(-7)M_(⊙)yr-1for V997 Cyg.The parameters of a third possible object in the system are also considered.The PHysics Of Eclipsing BinariEs Python code was used to analyze the light curves.The light curve solutions needed a cold starspot due to the asymmetry in the LS Del system’s light curve maxima.The mass ratio fill-out factor,and star temperature all indicate that both systems are contact binary types in this investigation.Two methods were applied to estimate the absolute parameters of the systems:one method relied on the parallax of Gaia DR3,and the other used a P-M relationship.The positions of the systems are also depicted on the M-L,M-R q-L_(ratio),and logM_(tot)-logJ_(0)diagrams.We recommend that further observations and investigations be done on the existence of a fourth body in this system.展开更多
del Nido液(DN液)是一种心肌保护液,不仅能在心脏外科手术时为停搏的心脏提供良好的保护作用,还能维持清晰的手术视野。但目前对DN液灌注剂量及再灌注间隔时间的评价指标国内外尚无统一标准,基于目前相关研究,本文仅对成人心肌在不同DN...del Nido液(DN液)是一种心肌保护液,不仅能在心脏外科手术时为停搏的心脏提供良好的保护作用,还能维持清晰的手术视野。但目前对DN液灌注剂量及再灌注间隔时间的评价指标国内外尚无统一标准,基于目前相关研究,本文仅对成人心肌在不同DN液灌注剂量下的心肌保护效果进行综述,以提供临床参考价值。展开更多
目的对1例血清学RHD弱阳性的患者进行RHD基因型检测。方法采用盐水法以及抗人球蛋白法鉴定RHD血型,应用抗球蛋白微柱凝胶卡进行直接抗人球蛋白试验;采用RH血型分型卡检测RHCE表型;对RHD基因的10个外显子进行PCR扩增及直接测序分析。结...目的对1例血清学RHD弱阳性的患者进行RHD基因型检测。方法采用盐水法以及抗人球蛋白法鉴定RHD血型,应用抗球蛋白微柱凝胶卡进行直接抗人球蛋白试验;采用RH血型分型卡检测RHCE表型;对RHD基因的10个外显子进行PCR扩增及直接测序分析。结果该个体血清学结果显示RHD抗原弱阳性表达,为D变异型,RHCE表型为CcEE,直接抗人球蛋白试验结果为阳性。RHD基因外显子直接测序发现其第9外显子上的第1227号碱基发生了G>A的杂合突变。同时,第3外显子上的第341号碱基发生了G>A的杂合突变,导致D抗原表达减弱。综上,该样本属RHD*weak D type 25/RHD*DEL1杂合型。结论此D变异型个体为弱D25与DEL型杂合的病例,其血清学表现为D变异型,且未检索到中国人群相关病例报道。展开更多
基金project was supported by the Scientific Research Projects Coordination Unit of Erciyes University(project number FBA-2022-11737)the TESS mission is provided by the NASA Explorer Program。
文摘The light curve analyses and orbital period variations for two contact binary stars,LS Del and V997 Cyg,are presented in this work which was conducted in the frame of the Binary Systems of South and North project Ground-based photometric observations were performed at two observatories in France.We used the Transiting Exoplanet Survey Satellite(TESS)data for extracting times of minima and light curve analysis of the targe systems.The O-C diagram for both systems displays a parabolic trend.LS Del and V997 Cyg’s orbital periods are increasing at rates of dP/dt=7.20×10^(-08)days yr^(-1)and dP/dt=2.54×10^(-08)days yr^(-1),respectively Therefore,it can be concluded that mass is being transferred from the less massive star to the more massive component with a rate of dM/dt=-1.96×10^(-7)M_(⊙)yr^(-1)for the LS Del system,and dM/dt=-3.83×10^(-7)M_(⊙)yr-1for V997 Cyg.The parameters of a third possible object in the system are also considered.The PHysics Of Eclipsing BinariEs Python code was used to analyze the light curves.The light curve solutions needed a cold starspot due to the asymmetry in the LS Del system’s light curve maxima.The mass ratio fill-out factor,and star temperature all indicate that both systems are contact binary types in this investigation.Two methods were applied to estimate the absolute parameters of the systems:one method relied on the parallax of Gaia DR3,and the other used a P-M relationship.The positions of the systems are also depicted on the M-L,M-R q-L_(ratio),and logM_(tot)-logJ_(0)diagrams.We recommend that further observations and investigations be done on the existence of a fourth body in this system.
文摘目的对1例血清学RHD弱阳性的患者进行RHD基因型检测。方法采用盐水法以及抗人球蛋白法鉴定RHD血型,应用抗球蛋白微柱凝胶卡进行直接抗人球蛋白试验;采用RH血型分型卡检测RHCE表型;对RHD基因的10个外显子进行PCR扩增及直接测序分析。结果该个体血清学结果显示RHD抗原弱阳性表达,为D变异型,RHCE表型为CcEE,直接抗人球蛋白试验结果为阳性。RHD基因外显子直接测序发现其第9外显子上的第1227号碱基发生了G>A的杂合突变。同时,第3外显子上的第341号碱基发生了G>A的杂合突变,导致D抗原表达减弱。综上,该样本属RHD*weak D type 25/RHD*DEL1杂合型。结论此D变异型个体为弱D25与DEL型杂合的病例,其血清学表现为D变异型,且未检索到中国人群相关病例报道。
