We measured the fluorescence spectra of the whole blood, the red blood cell (RBC) and the hemoglobin using 457.9-nm Ar+ laser excitation. It was found that the fluorescence spectra of the whole blood and the RBC have ...We measured the fluorescence spectra of the whole blood, the red blood cell (RBC) and the hemoglobin using 457.9-nm Ar+ laser excitation. It was found that the fluorescence spectra of the whole blood and the RBC have much similarities in the intensity, the emission peaks and the emitting region, and abundant peaks can be found. But for the hemoglobin, fluorescence could only be found in the wavelength range 580 - 650 nm. It was concluded that in the wavelength range of 650-850 nm, the fluorescence spectra were emitted by the new fluorophores generated by the breakdown of some weak bonds on the RBC membrane, such as the C-C bond and the C-N bond. In the wavelength range of 590-650 nm, the fluorescence spectra are mainly emitted by the hemoglobin, but the hemoglobin solution of cracked RBC has a strong quencher effect on the fluorescence spectrum. The experimental result and the theoretical analysis are meaningful for the medical diagnostics and the therapy.展开更多
建立利用气相色谱热导检测器分析气体激光器用氦中氧气、氮气、一氧化碳、二氧化碳及氙气混合气体标准物质的方法。试验比较了不同极性、不同类型的色谱柱,对柱箱温度、载气流量进行了优化,最终确定以HP–PLOT/分子筛色谱柱分离氧气、...建立利用气相色谱热导检测器分析气体激光器用氦中氧气、氮气、一氧化碳、二氧化碳及氙气混合气体标准物质的方法。试验比较了不同极性、不同类型的色谱柱,对柱箱温度、载气流量进行了优化,最终确定以HP–PLOT/分子筛色谱柱分离氧气、氮气、一氧化碳、氙气,柱箱温度保持40℃,以HP–PLOT Q柱分离二氧化碳,柱箱温度保持60℃,载气流量均为2 m L/min。在混合气体标准物质量值范围内,该分析方法测定结果的相对标准偏差不大于1%(n=6),对重量法配制得标准气体进行分析比对,测量误差不大于1%。展开更多
An external-cavity diode laser (ECDL) has been used to investigate pressure-induced self-broadening as well as frequency shift of 2v3 band R9 manifold of methane. A phase sensitivity detection technology has been empl...An external-cavity diode laser (ECDL) has been used to investigate pressure-induced self-broadening as well as frequency shift of 2v3 band R9 manifold of methane. A phase sensitivity detection technology has been employed to determine the pressure induced frequency shift coefficient, however, which is obtained by line shape analyses of the recorded absorption spectrum. F1 and F2 unresolved double lines near 6105.626 cm-1 were measured as an object because they are often used to the high sensitivity detection of trace methane. The results show that the self-broadening and pressure induced frequency shift coefficients are 0.0232±0.003 and 0.0055± 0.0007 MHz/Pa, respectively.展开更多
基金This work was supported by the Science Research Fund of Department of Education, Jiangsu Province (No. 02KJB140006),
文摘We measured the fluorescence spectra of the whole blood, the red blood cell (RBC) and the hemoglobin using 457.9-nm Ar+ laser excitation. It was found that the fluorescence spectra of the whole blood and the RBC have much similarities in the intensity, the emission peaks and the emitting region, and abundant peaks can be found. But for the hemoglobin, fluorescence could only be found in the wavelength range 580 - 650 nm. It was concluded that in the wavelength range of 650-850 nm, the fluorescence spectra were emitted by the new fluorophores generated by the breakdown of some weak bonds on the RBC membrane, such as the C-C bond and the C-N bond. In the wavelength range of 590-650 nm, the fluorescence spectra are mainly emitted by the hemoglobin, but the hemoglobin solution of cracked RBC has a strong quencher effect on the fluorescence spectrum. The experimental result and the theoretical analysis are meaningful for the medical diagnostics and the therapy.
文摘建立利用气相色谱热导检测器分析气体激光器用氦中氧气、氮气、一氧化碳、二氧化碳及氙气混合气体标准物质的方法。试验比较了不同极性、不同类型的色谱柱,对柱箱温度、载气流量进行了优化,最终确定以HP–PLOT/分子筛色谱柱分离氧气、氮气、一氧化碳、氙气,柱箱温度保持40℃,以HP–PLOT Q柱分离二氧化碳,柱箱温度保持60℃,载气流量均为2 m L/min。在混合气体标准物质量值范围内,该分析方法测定结果的相对标准偏差不大于1%(n=6),对重量法配制得标准气体进行分析比对,测量误差不大于1%。
基金This work was partially supported by Excellent experts funds of development-plan council of Shanxi province and the Natural Science Funds of Shanxi province (No.20041037).
文摘An external-cavity diode laser (ECDL) has been used to investigate pressure-induced self-broadening as well as frequency shift of 2v3 band R9 manifold of methane. A phase sensitivity detection technology has been employed to determine the pressure induced frequency shift coefficient, however, which is obtained by line shape analyses of the recorded absorption spectrum. F1 and F2 unresolved double lines near 6105.626 cm-1 were measured as an object because they are often used to the high sensitivity detection of trace methane. The results show that the self-broadening and pressure induced frequency shift coefficients are 0.0232±0.003 and 0.0055± 0.0007 MHz/Pa, respectively.
