目的:探讨心脏死亡供体器官捐献(donation after cardiac death,DCD)来源角膜植片术后排斥反应与角膜内皮细胞的相关性。方法:用角膜内皮显微镜对心脏死亡供体来源角膜植片行穿透性角膜移植术后发生排斥反应的28例28眼角膜植片分别于术...目的:探讨心脏死亡供体器官捐献(donation after cardiac death,DCD)来源角膜植片术后排斥反应与角膜内皮细胞的相关性。方法:用角膜内皮显微镜对心脏死亡供体来源角膜植片行穿透性角膜移植术后发生排斥反应的28例28眼角膜植片分别于术后<1、2~3、4~6、7~12mo行角膜内皮镜检查。结果:28例患者术后<1、2~3、4~6、7~12mo的角膜内皮细胞变异系数分别为38.23%、49.56%、57.18%、65.04%;角膜内皮细胞密度分别为2071.15±311.47、1771.33±348.18、1626.59±353.92、1553.14±307.31个/mm2;角膜内皮细胞变异系数与排斥反应呈正相关关系(r=0.95,P<0.05);术后角膜内皮细胞密度与排斥反应呈负相关关系(r=-0.93,P<0.05)。结论:DCD穿透性角膜移植术后发生排斥反应时有角膜内皮细胞变异系数逐步增高,角膜内皮细胞密度逐步降低的趋势;角膜内皮细胞变异系数、角膜内皮细胞密度可作为早期检测术后排斥反应的指标。展开更多
A new amidoxime-functionalized ultrahigh molecular weight polyethylene fibrous adsorbent(UHMWPEg-PAO) was used for the recovery of Au(III) from acid aqueous solution.The maximum experimental absorption capacity of UHM...A new amidoxime-functionalized ultrahigh molecular weight polyethylene fibrous adsorbent(UHMWPEg-PAO) was used for the recovery of Au(III) from acid aqueous solution.The maximum experimental absorption capacity of UHMWPE-g-PAO fiber was found to be approximately 220.0 mg·g^-1.Au adsorption on UHMWPE-g-PAO was characterized by synchrotron radiation-based microcomputed tomography(SR-μ-CT),transmission electron microscopy(TEM),X-ray absorption near-edge structure spectroscopy(XANES) and synchrotron radiation-based Fourier transform infrared microspectroscopy(SR-FTIR).The SR-μ-CT and TEM results showed the distribution features of gold particles on the fiber.The mechanism of Au(III) recovery from aqueous solutions by UHMWPE-g-PAO was based on the adsorbed Au(III) ions,which were reduced to metallic zero-valent gold(Au(0)) by amino groups(-NH2) in the amidoxime(AO)groups during the adsorption process,as confirmed by highresolution TEM(HRTEM) and XANES analyses.X-ray diffraction(XRD) results indicated that the incineration ashes contained metallic zero-valent gold.In conclusion,this amidoxime-functionalized fibrous adsorbent is a promising material for recovering gold from aqueous solution.展开更多
Electroreduction of CO_(2)(CO_(2) RR)to value-added chemicals offers a promising approach to balance the global carbon emission,but still remains a signifi-cantchallengeduetohighoverpotential,lowfaradaic efficiency,an...Electroreduction of CO_(2)(CO_(2) RR)to value-added chemicals offers a promising approach to balance the global carbon emission,but still remains a signifi-cantchallengeduetohighoverpotential,lowfaradaic efficiency,and poor selectivity of electrocatalysts systems.展开更多
文摘目的:探讨心脏死亡供体器官捐献(donation after cardiac death,DCD)来源角膜植片术后排斥反应与角膜内皮细胞的相关性。方法:用角膜内皮显微镜对心脏死亡供体来源角膜植片行穿透性角膜移植术后发生排斥反应的28例28眼角膜植片分别于术后<1、2~3、4~6、7~12mo行角膜内皮镜检查。结果:28例患者术后<1、2~3、4~6、7~12mo的角膜内皮细胞变异系数分别为38.23%、49.56%、57.18%、65.04%;角膜内皮细胞密度分别为2071.15±311.47、1771.33±348.18、1626.59±353.92、1553.14±307.31个/mm2;角膜内皮细胞变异系数与排斥反应呈正相关关系(r=0.95,P<0.05);术后角膜内皮细胞密度与排斥反应呈负相关关系(r=-0.93,P<0.05)。结论:DCD穿透性角膜移植术后发生排斥反应时有角膜内皮细胞变异系数逐步增高,角膜内皮细胞密度逐步降低的趋势;角膜内皮细胞变异系数、角膜内皮细胞密度可作为早期检测术后排斥反应的指标。
基金financially supported by the National Natural Science Foundation of China(Nos.21677116,91543118,11775289 and 11275256)
文摘A new amidoxime-functionalized ultrahigh molecular weight polyethylene fibrous adsorbent(UHMWPEg-PAO) was used for the recovery of Au(III) from acid aqueous solution.The maximum experimental absorption capacity of UHMWPE-g-PAO fiber was found to be approximately 220.0 mg·g^-1.Au adsorption on UHMWPE-g-PAO was characterized by synchrotron radiation-based microcomputed tomography(SR-μ-CT),transmission electron microscopy(TEM),X-ray absorption near-edge structure spectroscopy(XANES) and synchrotron radiation-based Fourier transform infrared microspectroscopy(SR-FTIR).The SR-μ-CT and TEM results showed the distribution features of gold particles on the fiber.The mechanism of Au(III) recovery from aqueous solutions by UHMWPE-g-PAO was based on the adsorbed Au(III) ions,which were reduced to metallic zero-valent gold(Au(0)) by amino groups(-NH2) in the amidoxime(AO)groups during the adsorption process,as confirmed by highresolution TEM(HRTEM) and XANES analyses.X-ray diffraction(XRD) results indicated that the incineration ashes contained metallic zero-valent gold.In conclusion,this amidoxime-functionalized fibrous adsorbent is a promising material for recovering gold from aqueous solution.
基金We acknowledge the financial support received from the National Key Research and Development Program of China(2018YFA0208600 and 2017YFA0700100)Key Research Program of Frontier Science,CAS(QYZDJ-SSW-SLH045)+2 种基金Strategic Priority Research Program of the Chinese Academy of Sciences(XDB20000000)NSFC(21671188,21871263 and 21520102001)Youth Innovation Promotion Association,CAS(2014265).
文摘Electroreduction of CO_(2)(CO_(2) RR)to value-added chemicals offers a promising approach to balance the global carbon emission,but still remains a signifi-cantchallengeduetohighoverpotential,lowfaradaic efficiency,and poor selectivity of electrocatalysts systems.