目的:探讨枸橼酸咖啡因联合肺表面活性物质(PS)对新生儿呼吸窘迫综合征(NRDS)患儿肺功能及血清氨基末端脑钠肽前体(amino-terminal pro-brain natriuretic peptide,NT-ProBNP)、白介素-6(inter-leukin-6,IL-6)水平的关联。方法:选2019年...目的:探讨枸橼酸咖啡因联合肺表面活性物质(PS)对新生儿呼吸窘迫综合征(NRDS)患儿肺功能及血清氨基末端脑钠肽前体(amino-terminal pro-brain natriuretic peptide,NT-ProBNP)、白介素-6(inter-leukin-6,IL-6)水平的关联。方法:选2019年7月至2020年7月在我院接受治疗的NRDS患儿80例按随机数字表余数法分为观察组与对照组,每组各40例。对照组予以PS治疗,观察组在对照组基础上加用枸橼酸咖啡因。比较两组临床疗效、肺功能指标、血清NT-proBNP和IL-6水平以及并发症发生率。结果:治疗后,观察组总有效率显著高于对照组(P<0.05)。治疗后观察组达峰时间比(ratio of time to peak tidal expiratory flow and total expiratory time,TPEF/TE)、达峰容积比(ratio of expiratory volume at peak tidal expiratory flow and total expiratory volume,VPEF/VE)及每千克体重潮气量(Tidal volume/kg,VT/kg)指标升高幅度显著高于对照组(P<0.05)。治疗后观察组NT-proBNP、IL-6水平降低幅度显著高于对照组(P<0.05)。与对照组比较,观察组并发症发生率显著降低(P<0.05)。结论:枸橼酸咖啡因联合PS治疗NRDS患儿临床疗效显著,与NRDS患儿肺功能提高、血清NT-proBNP、IL-6水平调节相关,可有效避免并发症发生。展开更多
Citrate-reduced silver nanoparticles (Ag-NPs) are used extensively for surface-enhanced Raman scattering (SERS) studies, but are typically found to aggregate using an aggregation agent. This study is aimed at developi...Citrate-reduced silver nanoparticles (Ag-NPs) are used extensively for surface-enhanced Raman scattering (SERS) studies, but are typically found to aggregate using an aggregation agent. This study is aimed at developing a simple, stable, and reproducible aggregated method for Ag-NPs without any aggregation agents in aqueous solutions. The aggregation is induced by the process of centrifugation, water washing and ultrasonication. A mechanism based on the nonuniform distribution of capping ligands is proposed to account for the aggregated structure formation. UV-Vis-NIR extinction spectra and TEM allowed us to identify the existence of Ag-NPs aggregation. Further, due to the polydisperse mixture of Ag-NPs (20~65 nm) used in the present work, Ag-NPs are aggregated closely, which contribute to the observation of low-concentration SERS from the residual citrate layer or even the single-molecule SERS of R6Gon aggregation. After the evaporation of droplet of Ag-NPs aggregation on the Si substrate, citrate or R6Gcould also be detected but with marked redor blue-shifts.展开更多
文摘目的:探讨枸橼酸咖啡因联合肺表面活性物质(PS)对新生儿呼吸窘迫综合征(NRDS)患儿肺功能及血清氨基末端脑钠肽前体(amino-terminal pro-brain natriuretic peptide,NT-ProBNP)、白介素-6(inter-leukin-6,IL-6)水平的关联。方法:选2019年7月至2020年7月在我院接受治疗的NRDS患儿80例按随机数字表余数法分为观察组与对照组,每组各40例。对照组予以PS治疗,观察组在对照组基础上加用枸橼酸咖啡因。比较两组临床疗效、肺功能指标、血清NT-proBNP和IL-6水平以及并发症发生率。结果:治疗后,观察组总有效率显著高于对照组(P<0.05)。治疗后观察组达峰时间比(ratio of time to peak tidal expiratory flow and total expiratory time,TPEF/TE)、达峰容积比(ratio of expiratory volume at peak tidal expiratory flow and total expiratory volume,VPEF/VE)及每千克体重潮气量(Tidal volume/kg,VT/kg)指标升高幅度显著高于对照组(P<0.05)。治疗后观察组NT-proBNP、IL-6水平降低幅度显著高于对照组(P<0.05)。与对照组比较,观察组并发症发生率显著降低(P<0.05)。结论:枸橼酸咖啡因联合PS治疗NRDS患儿临床疗效显著,与NRDS患儿肺功能提高、血清NT-proBNP、IL-6水平调节相关,可有效避免并发症发生。
文摘Citrate-reduced silver nanoparticles (Ag-NPs) are used extensively for surface-enhanced Raman scattering (SERS) studies, but are typically found to aggregate using an aggregation agent. This study is aimed at developing a simple, stable, and reproducible aggregated method for Ag-NPs without any aggregation agents in aqueous solutions. The aggregation is induced by the process of centrifugation, water washing and ultrasonication. A mechanism based on the nonuniform distribution of capping ligands is proposed to account for the aggregated structure formation. UV-Vis-NIR extinction spectra and TEM allowed us to identify the existence of Ag-NPs aggregation. Further, due to the polydisperse mixture of Ag-NPs (20~65 nm) used in the present work, Ag-NPs are aggregated closely, which contribute to the observation of low-concentration SERS from the residual citrate layer or even the single-molecule SERS of R6Gon aggregation. After the evaporation of droplet of Ag-NPs aggregation on the Si substrate, citrate or R6Gcould also be detected but with marked redor blue-shifts.
基金supported by the National Natural Science Foundation of China(No.31871049)the National Undergraduates Innovation and Entrepreneurship Training Program of China(No.201811065012)。