This report is about the first record of non-avian dinosaur eggs in the Hefei Basin,Anhui Province,China.Based on the combination of elongated egg body,linear ridges on the outer surface and two structure layer,the eg...This report is about the first record of non-avian dinosaur eggs in the Hefei Basin,Anhui Province,China.Based on the combination of elongated egg body,linear ridges on the outer surface and two structure layer,the eggs can be referred to Elongatoolithidae.The gradual boundary between the cone and the column layers as well as the relative thin eggshell(less than 1 mm)indicates its affinity within Elongatoolithus.The eggs are identified as Elongatoolithus oosp.,as they were severely compressed and experienced erosion on both inner and outer surfaces.The discovery of egg fossil in the Hefei Basin offers evidence for stratum comparison in this region and supplements the diversity of egg fossils in Anhui.Meanwhile,this discovery also enriches the paleogeographic distribution of elongatoolithids.展开更多
The binding energy spectra and the momentum distributions of the valence orbitals of iso-butane, also known as methylpropane (CH_(3)CH(CH_(3))CH_(3)), are studied by using a high resolution binary (e, 2e) electron mom...The binding energy spectra and the momentum distributions of the valence orbitals of iso-butane, also known as methylpropane (CH_(3)CH(CH_(3))CH_(3)), are studied by using a high resolution binary (e, 2e) electron momentum spectrometer, at an impact energy of 1200eV plus the binding energy (8-32eV) with symmetric non-coplanar kinematics. Binding energy spectra of the valence shell are obtained at a coincidence energy resolution of 0.95 eV in full width at halfmaximum. The experimental momentum profiles of the inner valence orbitals are obtained and compared with the theoretical momentum distributions calculated by using Hartree-Fock and density functional theory methods with the basis sets 6-31G and 6-311++G**. The pole strengths of the inner orbitals are estimated and the final correlation effects are discussed.展开更多
We design and synthesize a series of novel silicon(IV)phthalocyanines(SiPcs,1a,2a,1b,and 2b)axially conjugated with arginine or arginine-containing oligopeptides(Arg-Arg,Cys-Arg,Cys-Arg-Arg)through ester or ether link...We design and synthesize a series of novel silicon(IV)phthalocyanines(SiPcs,1a,2a,1b,and 2b)axially conjugated with arginine or arginine-containing oligopeptides(Arg-Arg,Cys-Arg,Cys-Arg-Arg)through ester or ether linkers to demonstrate the effects of substituents and coupling ways on the spectral behaviors and photodynamic activities.The ester-linked SiPcs(1a and 2a)show slight red-shift,higher fluorescence emission and singlet oxygen generation compared to the ether-linked analogues(1b and 2b)due to the stronger electron-withdrawing ability of the ester group,suggesting that electronic effect of the linkers plays an important role in their spectral properties.The introduction of arginine could effectively reduce the aggregation of phthalocyanine in aqueous solutions.With higher cellular uptake and plasma membrane localization ability,1b and 2b exhibit significantly higher photocytotoxicity against both HepG2 and Hela cells.Moreover,the in vivo fluorescence imaging suggests that 2b is the most specific toward H22 tumor-bearing ICR mice,and it shows efficient tumor growth inhibition with the tumor inhibition rate up to 93%.Thus,this work would provide a new reference for the development of phthalocyanine-based photosensitizers.展开更多
文摘This report is about the first record of non-avian dinosaur eggs in the Hefei Basin,Anhui Province,China.Based on the combination of elongated egg body,linear ridges on the outer surface and two structure layer,the eggs can be referred to Elongatoolithidae.The gradual boundary between the cone and the column layers as well as the relative thin eggshell(less than 1 mm)indicates its affinity within Elongatoolithus.The eggs are identified as Elongatoolithus oosp.,as they were severely compressed and experienced erosion on both inner and outer surfaces.The discovery of egg fossil in the Hefei Basin offers evidence for stratum comparison in this region and supplements the diversity of egg fossils in Anhui.Meanwhile,this discovery also enriches the paleogeographic distribution of elongatoolithids.
基金Supported by the NationalNatural Science Foundation of China under Grant Nos.19774037 and 19854002the foundation of Cao Guangbiao High-Tech Development of Tsinghua University.
文摘The binding energy spectra and the momentum distributions of the valence orbitals of iso-butane, also known as methylpropane (CH_(3)CH(CH_(3))CH_(3)), are studied by using a high resolution binary (e, 2e) electron momentum spectrometer, at an impact energy of 1200eV plus the binding energy (8-32eV) with symmetric non-coplanar kinematics. Binding energy spectra of the valence shell are obtained at a coincidence energy resolution of 0.95 eV in full width at halfmaximum. The experimental momentum profiles of the inner valence orbitals are obtained and compared with the theoretical momentum distributions calculated by using Hartree-Fock and density functional theory methods with the basis sets 6-31G and 6-311++G**. The pole strengths of the inner orbitals are estimated and the final correlation effects are discussed.
基金Supported by the Marine High-Tech Programs of Fujian Province,China(No.2016–14)the Regional Marine Economic Innovation and Development Demonstration Project of Fujian(No.2012FJ14)the National Natural Science Foundation of China(Nos.21301031,U1705282,and 21473033)。
文摘We design and synthesize a series of novel silicon(IV)phthalocyanines(SiPcs,1a,2a,1b,and 2b)axially conjugated with arginine or arginine-containing oligopeptides(Arg-Arg,Cys-Arg,Cys-Arg-Arg)through ester or ether linkers to demonstrate the effects of substituents and coupling ways on the spectral behaviors and photodynamic activities.The ester-linked SiPcs(1a and 2a)show slight red-shift,higher fluorescence emission and singlet oxygen generation compared to the ether-linked analogues(1b and 2b)due to the stronger electron-withdrawing ability of the ester group,suggesting that electronic effect of the linkers plays an important role in their spectral properties.The introduction of arginine could effectively reduce the aggregation of phthalocyanine in aqueous solutions.With higher cellular uptake and plasma membrane localization ability,1b and 2b exhibit significantly higher photocytotoxicity against both HepG2 and Hela cells.Moreover,the in vivo fluorescence imaging suggests that 2b is the most specific toward H22 tumor-bearing ICR mice,and it shows efficient tumor growth inhibition with the tumor inhibition rate up to 93%.Thus,this work would provide a new reference for the development of phthalocyanine-based photosensitizers.
