In this study, rose-like nickel oxide （NiO） nanoparticles with diameters of 400-500 nm are prepared on ITO glass substrates by simple electrodeposition in NiSO46H20 solution at room temperature followed by oxidation...In this study, rose-like nickel oxide （NiO） nanoparticles with diameters of 400-500 nm are prepared on ITO glass substrates by simple electrodeposition in NiSO46H20 solution at room temperature followed by oxidation in air. Scanning electron microscopy, x-ray diffraction and a transmission electron microscope are used for analyses of the NiO nanoparticles. The ethanol gas sensitivity of these nanoparticles is studied. The results indicate that the rose-like NiO nanoparticles could be used for the fabrication of ethanol gas sensors to monitor the low concentration of ethanol gas in air. Furthermore, at 5 ppm, the NiO nanorose-based sensors show a high response to ethanol （Rg/Ra = 8.4）.展开更多
The development of efficient and stable non-noble metal-based electrocatalysts for the oxygen evolution reaction （OER） is one of the essential challenges for the upcoming hydrogen economy. Herein, three-dimensional ...The development of efficient and stable non-noble metal-based electrocatalysts for the oxygen evolution reaction （OER） is one of the essential challenges for the upcoming hydrogen economy. Herein, three-dimensional （3D） mesoporous nickel iron selenide with rose-like microsphere architecture was directly grown on Ni foam via a successive two-step hydrotherrnal method. The unique 3D mesoporous rose-like morphology leads to a higher number of active sites as well as fast mass and electron transport through the entire electrode, and facilitates the release of 02 bubbles formed during the OER catalysis. As a result, the synthesized Ni0.76Fe0.24Se exhibits superior OER performances, with an ultralow overpotential of 197 mV needed to produce a current density of 10 mA.cm-2 in 1 M KOH, outperforming all transition metal selenide OER catalysts reported to date.展开更多
以自育月季品种"花仙子"和7个现代月季品种为试材,对Ty1-copia类逆转座子的RNaseH-LTR序列进行克隆与分析。根据Ty1-copia类逆转座子Rnase H 3'端具有保守结构域这一特点,对RNaseH-LTR序列进行克隆,共分离出7条RNaseH-LT...以自育月季品种"花仙子"和7个现代月季品种为试材,对Ty1-copia类逆转座子的RNaseH-LTR序列进行克隆与分析。根据Ty1-copia类逆转座子Rnase H 3'端具有保守结构域这一特点,对RNaseH-LTR序列进行克隆,共分离出7条RNaseH-LTR序列。分析显示7条序列同源性范围在7.7%~56.3%;序列内存在TATA-box和CAAT-box启动元件及多种逆境胁迫相关调控元件;RNaseH-LTR序列在长度和碱基组成上都存在着高度的异质性,而且每条序列都存在终止密码子突变,说明终止密码子突变可能是造成Ty1-copia类逆转座子RNaseH-LTR异质性的原因之一。展开更多
基金Supported by the Natural Science Foundation of Gansu Province under Grant No 1107RJZA090the Foundation of State Key Library of Functional Materials for Informatics of Shanghai Institute of Microsystem and Information Technologythe National Natural Science Foundation of China under Grant No 61204106
文摘In this study, rose-like nickel oxide （NiO） nanoparticles with diameters of 400-500 nm are prepared on ITO glass substrates by simple electrodeposition in NiSO46H20 solution at room temperature followed by oxidation in air. Scanning electron microscopy, x-ray diffraction and a transmission electron microscope are used for analyses of the NiO nanoparticles. The ethanol gas sensitivity of these nanoparticles is studied. The results indicate that the rose-like NiO nanoparticles could be used for the fabrication of ethanol gas sensors to monitor the low concentration of ethanol gas in air. Furthermore, at 5 ppm, the NiO nanorose-based sensors show a high response to ethanol （Rg/Ra = 8.4）.
基金This work was financially supported by the National Natural Science Foundation of China （Nos. 21571145 and 21633008）, the Fundamental Research Funds for the Central Universities and Large-scale Instrument and Equipment Sharing Foundation of Wuhan University.
文摘The development of efficient and stable non-noble metal-based electrocatalysts for the oxygen evolution reaction （OER） is one of the essential challenges for the upcoming hydrogen economy. Herein, three-dimensional （3D） mesoporous nickel iron selenide with rose-like microsphere architecture was directly grown on Ni foam via a successive two-step hydrotherrnal method. The unique 3D mesoporous rose-like morphology leads to a higher number of active sites as well as fast mass and electron transport through the entire electrode, and facilitates the release of 02 bubbles formed during the OER catalysis. As a result, the synthesized Ni0.76Fe0.24Se exhibits superior OER performances, with an ultralow overpotential of 197 mV needed to produce a current density of 10 mA.cm-2 in 1 M KOH, outperforming all transition metal selenide OER catalysts reported to date.
文摘以自育月季品种"花仙子"和7个现代月季品种为试材,对Ty1-copia类逆转座子的RNaseH-LTR序列进行克隆与分析。根据Ty1-copia类逆转座子Rnase H 3'端具有保守结构域这一特点,对RNaseH-LTR序列进行克隆,共分离出7条RNaseH-LTR序列。分析显示7条序列同源性范围在7.7%~56.3%;序列内存在TATA-box和CAAT-box启动元件及多种逆境胁迫相关调控元件;RNaseH-LTR序列在长度和碱基组成上都存在着高度的异质性,而且每条序列都存在终止密码子突变,说明终止密码子突变可能是造成Ty1-copia类逆转座子RNaseH-LTR异质性的原因之一。
