本文通过扩展的改进多参数指数型(the extended improved multiparameter exponential-type,EIMPET)势能模型,结合实验光谱数据,研究了H_(2)和HD分子的热力学性质.首先利用解析势能曲线计算得到分子的振转能级,其次结合量子统计系综理...本文通过扩展的改进多参数指数型(the extended improved multiparameter exponential-type,EIMPET)势能模型,结合实验光谱数据,研究了H_(2)和HD分子的热力学性质.首先利用解析势能曲线计算得到分子的振转能级,其次结合量子统计系综理论计算了分子在100—6000 K温度下的配分函数、摩尔热容、摩尔熵、摩尔焓以及约化摩尔吉布斯自由能.计算结果与美国国家标准与技术研究所(National Institute of Standards and Technology,NIST)数据库中的数据具有良好的一致性.本文的理论方法可用于预测某些气态物质的热力学性质.展开更多
[目的]水稻Hd1(Heading date 1)在不同遗传背景的品种中存在多种单体型,利用CRISPR/Cas9基因编辑技术创制hd1突变体探究其对抽穗期的调控,解析Hd1单体型的功能特性。[方法]在Hd1的CDS设计靶位点,构建敲除载体,利用农杆菌介导法转入受体...[目的]水稻Hd1(Heading date 1)在不同遗传背景的品种中存在多种单体型,利用CRISPR/Cas9基因编辑技术创制hd1突变体探究其对抽穗期的调控,解析Hd1单体型的功能特性。[方法]在Hd1的CDS设计靶位点,构建敲除载体,利用农杆菌介导法转入受体品种龙粳11(LJ11)和松粳2(SJ2)中。测序鉴定转基因植株突变类型,与对照同时种植调查抽穗期,qRT-PCR检测突变体中成花素基因Hd3a和RFT1的表达量。[结果]Hd1的编码区在LJ11背景下第30个碱基后面插入G,在SJ2背景下第31个碱基后面插入T,获得纯合突变体hd1(LJ11)和hd1(SJ2),相较于野生型,hd1(LJ11)延迟了水稻开花,Hd3a和RFT1的表达量下降,而hd1(SJ2)提早了水稻开花伴随着Hd3a和RFT1的表达量上升。[结论]hd1(LJ11)延迟抽穗6.1 d,hd1(SJ2)提早开花2.8 d,说明两种遗传背景下Hd1发挥功能存在差异性,调控抽穗期具有背景依赖性。展开更多
A series of sulfided PtMo/ γ Al 2O 3 catalysts[ w (Mo)=9.0%] with different contents of Pt were characterized by using low temperature FTIR spectroscopy of adsorbed CO, while their HDS activity was investigated with ...A series of sulfided PtMo/ γ Al 2O 3 catalysts[ w (Mo)=9.0%] with different contents of Pt were characterized by using low temperature FTIR spectroscopy of adsorbed CO, while their HDS activity was investigated with thiophene as a model substrate. Experimentally, it was found that no existence of the bands related to the surface complexes of Al 3+ ←CO and Pt 0←CO→Pt 0 was observed at 77 K and that the rate of the thiophene HDS reaction(573 K) is well linearly proportional to the area of the Pt 0←CO band at 2 093 cm -1 with a higher extrapolated HDS rate compared to that of sulfided Mo/ γ Al 2O 3 catalyst at the zero content of platinum. On the basis of the results here, the conclusion may be made that the active monolayer phase of Pt Mo S may be formed over sulfided PtMo/ γ Al 2O 3 catalysts during the sulfidation process and that both Mo 2+ and Pt 0 sites for CO adsorption should be the active reaction centers of thiophene HDS.展开更多
La(Ⅲ) was quantitatively adsorbed by macroporous weak acid resin (HD-2) in the medium of pH=6.16. The statically saturated sorption capacity is 231 mg·g -1(resin). 3.0 mol·L -1 HCl can be used as an eluant....La(Ⅲ) was quantitatively adsorbed by macroporous weak acid resin (HD-2) in the medium of pH=6.16. The statically saturated sorption capacity is 231 mg·g -1(resin). 3.0 mol·L -1 HCl can be used as an eluant. The elution percentage is 100%. The sorption rate constant is k_ 298=3.04×10 -5 s -1. The apparent sorption activation energy of HD-2 for La(Ⅲ) is 31.2 kJ·mol -1. The sorption behavior of HD-2 for La(Ⅲ) obeys the Freundlich isotherm. The adsorption parameters of thermodynamic are ΔH=9.56 kJ·mol -1, ΔS=35.7 J·mol -1·K -1, ΔG=-1.08 kJ·mol -1, respectively.展开更多
文摘本文通过扩展的改进多参数指数型(the extended improved multiparameter exponential-type,EIMPET)势能模型,结合实验光谱数据,研究了H_(2)和HD分子的热力学性质.首先利用解析势能曲线计算得到分子的振转能级,其次结合量子统计系综理论计算了分子在100—6000 K温度下的配分函数、摩尔热容、摩尔熵、摩尔焓以及约化摩尔吉布斯自由能.计算结果与美国国家标准与技术研究所(National Institute of Standards and Technology,NIST)数据库中的数据具有良好的一致性.本文的理论方法可用于预测某些气态物质的热力学性质.
文摘[目的]水稻Hd1(Heading date 1)在不同遗传背景的品种中存在多种单体型,利用CRISPR/Cas9基因编辑技术创制hd1突变体探究其对抽穗期的调控,解析Hd1单体型的功能特性。[方法]在Hd1的CDS设计靶位点,构建敲除载体,利用农杆菌介导法转入受体品种龙粳11(LJ11)和松粳2(SJ2)中。测序鉴定转基因植株突变类型,与对照同时种植调查抽穗期,qRT-PCR检测突变体中成花素基因Hd3a和RFT1的表达量。[结果]Hd1的编码区在LJ11背景下第30个碱基后面插入G,在SJ2背景下第31个碱基后面插入T,获得纯合突变体hd1(LJ11)和hd1(SJ2),相较于野生型,hd1(LJ11)延迟了水稻开花,Hd3a和RFT1的表达量下降,而hd1(SJ2)提早了水稻开花伴随着Hd3a和RFT1的表达量上升。[结论]hd1(LJ11)延迟抽穗6.1 d,hd1(SJ2)提早开花2.8 d,说明两种遗传背景下Hd1发挥功能存在差异性,调控抽穗期具有背景依赖性。
文摘A series of sulfided PtMo/ γ Al 2O 3 catalysts[ w (Mo)=9.0%] with different contents of Pt were characterized by using low temperature FTIR spectroscopy of adsorbed CO, while their HDS activity was investigated with thiophene as a model substrate. Experimentally, it was found that no existence of the bands related to the surface complexes of Al 3+ ←CO and Pt 0←CO→Pt 0 was observed at 77 K and that the rate of the thiophene HDS reaction(573 K) is well linearly proportional to the area of the Pt 0←CO band at 2 093 cm -1 with a higher extrapolated HDS rate compared to that of sulfided Mo/ γ Al 2O 3 catalyst at the zero content of platinum. On the basis of the results here, the conclusion may be made that the active monolayer phase of Pt Mo S may be formed over sulfided PtMo/ γ Al 2O 3 catalysts during the sulfidation process and that both Mo 2+ and Pt 0 sites for CO adsorption should be the active reaction centers of thiophene HDS.
文摘La(Ⅲ) was quantitatively adsorbed by macroporous weak acid resin (HD-2) in the medium of pH=6.16. The statically saturated sorption capacity is 231 mg·g -1(resin). 3.0 mol·L -1 HCl can be used as an eluant. The elution percentage is 100%. The sorption rate constant is k_ 298=3.04×10 -5 s -1. The apparent sorption activation energy of HD-2 for La(Ⅲ) is 31.2 kJ·mol -1. The sorption behavior of HD-2 for La(Ⅲ) obeys the Freundlich isotherm. The adsorption parameters of thermodynamic are ΔH=9.56 kJ·mol -1, ΔS=35.7 J·mol -1·K -1, ΔG=-1.08 kJ·mol -1, respectively.
