目的:鉴定0-36-40-44 h大鼠短间隔连续部分肝切除(0- 36-40-44 h SISPH)中与肝再生有关的基因,并分析他们在肝再生中的表达动态和作用. 方法:从0-36-40-44h SISPH再生肝消减cDNA文库中筛选与肝再生有关的基因,用基因芯片技术分析其在肝...目的:鉴定0-36-40-44 h大鼠短间隔连续部分肝切除(0- 36-40-44 h SISPH)中与肝再生有关的基因,并分析他们在肝再生中的表达动态和作用. 方法:从0-36-40-44h SISPH再生肝消减cDNA文库中筛选与肝再生有关的基因,用基因芯片技术分析其在肝再生中的表达动态,并用GeneMath软件对有关基因进行聚类分析. 结果:用基因芯片技术分析的551个与肝再生有关基因中, 157个基因至少在肝再生的—个时间点表达变化达2倍以上,其中,上调表达的基因有87个,下调表达的基因有70个;157个基因中的71个属未报道的基因,86个为已报道基因,但在此之前尚不清楚他们与肝再生有关;聚类分析和统计学分析表明,0-36-40-44 h SISPH的基因表达模式分为6类,即早期诱导,中期诱导,晚期诱导,早期抑制,中期抑制,晚期抑制.与PH相比,38个基因在0-36-40-44 h SISPH中特异性表达,119个基因在这两个模型中表达趋势相同,但在各时间点的表达丰度不同. 结论:0-36-40-44 h SISPH中,上调和下调表达的基因数目相差不大;晚期表达的基因多于早期表达的基因,远多于中期表达的基因;表达幅度小的基因(2-5倍)多于表达幅度大的基因.展开更多
The regulation of heat shock transcription factor to heat shock protein expression and the newest knowledge about the effect of heat shock protein on aging,immune response and the balance of cell survival and apoptosi...The regulation of heat shock transcription factor to heat shock protein expression and the newest knowledge about the effect of heat shock protein on aging,immune response and the balance of cell survival and apoptosis are summarized in the paper.展开更多
We investigated the structural evolution and elecfronic properties of ConC3-/0 and ConC4-/0 （n=1-4） clusters by using mass-selected photoelectron spectroscopy and density functional theory calculations. The adiabati...We investigated the structural evolution and elecfronic properties of ConC3-/0 and ConC4-/0 （n=1-4） clusters by using mass-selected photoelectron spectroscopy and density functional theory calculations. The adiabatic and vertical detachment energies of CO1-4C3- and COl-4C4- were obtained from their photoelectron spectra. By comparing the theoretical results with the experimental data, the global minimum structures were determined. The results indicate that the carbon atoms of ConC3-/0 and ConC4-/0 （n=1-4） are separated from each other gradually with increasing number of cobalt atoms but a C2 unit still remains at n=4. It is interesting that the Co2C3- and Co2C4- anions have planar structures whereas the neutral Co2C3 and Co2C4 have linear structures with the Co atoms at two ends. The Co3C3- anion has a planar structure with a Co2C2 four-membered ring and a Co3C four-membered ring sharing a Co-Co bond, while the neutral Co3C3 is a three-dimensional structure with a C2 unit and a C atom connecting to two faces of the Co3 triangle.展开更多
Transition metal carbides have been shown to exhibit good catalytic performance that depends on their compositions and morphologies,and understanding such catalytic properties requires knowledge of their precise geome...Transition metal carbides have been shown to exhibit good catalytic performance that depends on their compositions and morphologies,and understanding such catalytic properties requires knowledge of their precise geometry,determination of which is challenging,particularly for clusters formed by multiple elements.In this study,we investigate the geometries and electronic structures of binary V_(n)C_(3)-(n=1-6)clusters and their neutrals using photoelectron spectroscopy and theoretical calculations based on density functional theory.The adiabatic detachment energies of V_(n)C_(3)-,or equally,the electron affinities of V_(n)C_(3),have been determined from the measured photoelectron spectra.Theoretical calculations reveal that the carbon atoms become separate when the number of V atoms increases in the clusters,i.e.,the C-C interactions present in small clusters are replaced by V-C and/or V-V interactions in larger ones.We further explore the composition dependent formation of cubic or cube-like structures in 8-atom VnCm(n+m=8)clusters.展开更多
文摘目的:鉴定0-36-40-44 h大鼠短间隔连续部分肝切除(0- 36-40-44 h SISPH)中与肝再生有关的基因,并分析他们在肝再生中的表达动态和作用. 方法:从0-36-40-44h SISPH再生肝消减cDNA文库中筛选与肝再生有关的基因,用基因芯片技术分析其在肝再生中的表达动态,并用GeneMath软件对有关基因进行聚类分析. 结果:用基因芯片技术分析的551个与肝再生有关基因中, 157个基因至少在肝再生的—个时间点表达变化达2倍以上,其中,上调表达的基因有87个,下调表达的基因有70个;157个基因中的71个属未报道的基因,86个为已报道基因,但在此之前尚不清楚他们与肝再生有关;聚类分析和统计学分析表明,0-36-40-44 h SISPH的基因表达模式分为6类,即早期诱导,中期诱导,晚期诱导,早期抑制,中期抑制,晚期抑制.与PH相比,38个基因在0-36-40-44 h SISPH中特异性表达,119个基因在这两个模型中表达趋势相同,但在各时间点的表达丰度不同. 结论:0-36-40-44 h SISPH中,上调和下调表达的基因数目相差不大;晚期表达的基因多于早期表达的基因,远多于中期表达的基因;表达幅度小的基因(2-5倍)多于表达幅度大的基因.
文摘The regulation of heat shock transcription factor to heat shock protein expression and the newest knowledge about the effect of heat shock protein on aging,immune response and the balance of cell survival and apoptosis are summarized in the paper.
文摘We investigated the structural evolution and elecfronic properties of ConC3-/0 and ConC4-/0 （n=1-4） clusters by using mass-selected photoelectron spectroscopy and density functional theory calculations. The adiabatic and vertical detachment energies of CO1-4C3- and COl-4C4- were obtained from their photoelectron spectra. By comparing the theoretical results with the experimental data, the global minimum structures were determined. The results indicate that the carbon atoms of ConC3-/0 and ConC4-/0 （n=1-4） are separated from each other gradually with increasing number of cobalt atoms but a C2 unit still remains at n=4. It is interesting that the Co2C3- and Co2C4- anions have planar structures whereas the neutral Co2C3 and Co2C4 have linear structures with the Co atoms at two ends. The Co3C3- anion has a planar structure with a Co2C2 four-membered ring and a Co3C four-membered ring sharing a Co-Co bond, while the neutral Co3C3 is a three-dimensional structure with a C2 unit and a C atom connecting to two faces of the Co3 triangle.
基金the Doctoral Start-up Funding of Zhengzhou University of Light Industry(No.2017BSJJ030)Henan Province Science Fund for Excellent Young Scholars(No.202300410494)+4 种基金the Beijing Municipal Science and Technology Commission(No.Z191100007219009)for supportsthe VSC(Flemish Supercomputer Center),funded by the Research Foundation-Flanders(FWO)the Flemish Government-department EWIthe support of Xi’an Jiaotong University via the“Young Talent Support Plan”the“Fundamental Research Funds for Central Universities”。
文摘Transition metal carbides have been shown to exhibit good catalytic performance that depends on their compositions and morphologies,and understanding such catalytic properties requires knowledge of their precise geometry,determination of which is challenging,particularly for clusters formed by multiple elements.In this study,we investigate the geometries and electronic structures of binary V_(n)C_(3)-(n=1-6)clusters and their neutrals using photoelectron spectroscopy and theoretical calculations based on density functional theory.The adiabatic detachment energies of V_(n)C_(3)-,or equally,the electron affinities of V_(n)C_(3),have been determined from the measured photoelectron spectra.Theoretical calculations reveal that the carbon atoms become separate when the number of V atoms increases in the clusters,i.e.,the C-C interactions present in small clusters are replaced by V-C and/or V-V interactions in larger ones.We further explore the composition dependent formation of cubic or cube-like structures in 8-atom VnCm(n+m=8)clusters.
