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2002 Volume 18 Issue 8
2002, 18(08): 673-675
doi: 10.3866/PKU.WHXB20020801
Abstract:
With confocal microscopy and grating spectrograph, the absorption and fluorescence emission spectra of single Anabaena strain PCC 7120 cells have been studied in intact filaments in situ. The different spectra between vegetative cells and heterocysts...
With confocal microscopy and grating spectrograph, the absorption and fluorescence emission spectra of single Anabaena strain PCC 7120 cells have been studied in intact filaments in situ. The different spectra between vegetative cells and heterocysts...
2002, 18(08): 676-679
doi: 10.3866/PKU.WHXB20020802
Abstract:
Hydrophobicity and hydrogen bonds are main factors verning protein-protein interaction. We have developed a new method, which only uses these two characteristics to figure the properties of protein-protein interface. With this method, we can easily ...
Hydrophobicity and hydrogen bonds are main factors verning protein-protein interaction. We have developed a new method, which only uses these two characteristics to figure the properties of protein-protein interface. With this method, we can easily ...
2002, 18(08): 680-685
doi: 10.3866/PKU.WHXB20020803
Abstract:
Using grand canonical ensemble Monte Carlo method, adsorption isotherms, phase transition behaviors and structures of methane adsorbed in two pores of MCM-41, with 3.5 and 5.0 nm diameters, at 74.05 K and 300 K have been simulated. It is found that c...
Using grand canonical ensemble Monte Carlo method, adsorption isotherms, phase transition behaviors and structures of methane adsorbed in two pores of MCM-41, with 3.5 and 5.0 nm diameters, at 74.05 K and 300 K have been simulated. It is found that c...
2002, 18(08): 686-691
doi: 10.3866/PKU.WHXB20020804
Abstract:
Three kinds of naphthalene containing poly-amino-compounds with different chain length have been synthesized in this work. Their fluorescence spectra were recorded under different pH conditions and showed that the fluorescence intensity of studied co...
Three kinds of naphthalene containing poly-amino-compounds with different chain length have been synthesized in this work. Their fluorescence spectra were recorded under different pH conditions and showed that the fluorescence intensity of studied co...
2002, 18(08): 692-698
doi: 10.3866/PKU.WHXB20020805
Abstract:
Storage capacities of H2 in a kind of multi-walled carbon nanotubes (MWCNTs) and its corresponding system modified with K＋ salt were measured using volumetric method, and characteristics of adsorption and desorption of hydrogen on MWCNTs were studied...
Storage capacities of H2 in a kind of multi-walled carbon nanotubes (MWCNTs) and its corresponding system modified with K＋ salt were measured using volumetric method, and characteristics of adsorption and desorption of hydrogen on MWCNTs were studied...
2002, 18(08): 699-704
doi: 10.3866/PKU.WHXB20020806
Abstract:
To extend the recently proposed density functional theory(DFT)methodology to non-uniform non-hard sphere fluid, a new bridge functional as a function of indirect correlation function was proposed, which was based on analysis on the asymptotic behavio...
To extend the recently proposed density functional theory(DFT)methodology to non-uniform non-hard sphere fluid, a new bridge functional as a function of indirect correlation function was proposed, which was based on analysis on the asymptotic behavio...
2002, 18(08): 705-709
doi: 10.3866/PKU.WHXB20020807
Abstract:
A novel electrochemical method (RPG method) has been theoretically and experimentally developed to determine the diffusion coefficient of intercalary species within insertion-host materials on the basis of the spherical diffusion model. Theoretical r...
A novel electrochemical method (RPG method) has been theoretically and experimentally developed to determine the diffusion coefficient of intercalary species within insertion-host materials on the basis of the spherical diffusion model. Theoretical r...
2002, 18(08): 710-715
doi: 10.3866/PKU.WHXB20020808
Abstract:
The coal-petroleum coke-water slurries(CPCWS) are complex fluids. It has been known that the 1H-NMR can provide the quantitative information on the hydrophobic property of carbonaceous solid and on the microstructure and dynamics behavior about water...
The coal-petroleum coke-water slurries(CPCWS) are complex fluids. It has been known that the 1H-NMR can provide the quantitative information on the hydrophobic property of carbonaceous solid and on the microstructure and dynamics behavior about water...
2002, 18(08): 716-720
doi: 10.3866/PKU.WHXB20020809
Abstract:
The method proposed by us to carry out high accurate density functional calculations in a local region of a large system was applied to the calculation of a series of different type of molecules and the data such as Mulliken charges, bond lengths, bo...
The method proposed by us to carry out high accurate density functional calculations in a local region of a large system was applied to the calculation of a series of different type of molecules and the data such as Mulliken charges, bond lengths, bo...
2002, 18(08): 721-726
doi: 10.3866/PKU.WHXB20020810
Abstract:
The geometries of the reactants, transition state, and products of hydrogen transfer reaction CH3＋CH3NO2→CH4＋CH2NO2 have been optimized at the UMP2(full)/6-311G(d, p) level. The forward and reverse reaction potential barriers are 58.21 kJ•mol－1 and 6...
The geometries of the reactants, transition state, and products of hydrogen transfer reaction CH3＋CH3NO2→CH4＋CH2NO2 have been optimized at the UMP2(full)/6-311G(d, p) level. The forward and reverse reaction potential barriers are 58.21 kJ•mol－1 and 6...
2002, 18(08): 727-731
doi: 10.3866/PKU.WHXB20020811
Abstract:
It was reported that after the rapid formation of a gel by mixing of MMA and samarium triisopropoxide, the PMMA materials containing samarium were prepared by the in situ polymerization, the so called the non-water gel in situ polymerization. The eff...
It was reported that after the rapid formation of a gel by mixing of MMA and samarium triisopropoxide, the PMMA materials containing samarium were prepared by the in situ polymerization, the so called the non-water gel in situ polymerization. The eff...
2002, 18(08): 732-736
doi: 10.3866/PKU.WHXB20020812
Abstract:
The cyclic voltemmetry method was used to investigate the electrochemical behaviors of Y（Ⅲ）,Mg（Ⅱ）and Co（Ⅱ） in Y(NO3)3-LiClO4-DMF,Mg(ClO4)2-LiClO4-DMF and CoCl2-LiClO4-DMF systems on Pt cathode. Experimental results indicate that the electro-reduction...
The cyclic voltemmetry method was used to investigate the electrochemical behaviors of Y（Ⅲ）,Mg（Ⅱ）and Co（Ⅱ） in Y(NO3)3-LiClO4-DMF,Mg(ClO4)2-LiClO4-DMF and CoCl2-LiClO4-DMF systems on Pt cathode. Experimental results indicate that the electro-reduction...
2002, 18(08): 737-740
doi: 10.3866/PKU.WHXB20020813
Abstract:
The equilibrium geometry and potential energy curve for the ground state of molecule LaH have been calculated on several single-reference state methods of HF,B3LYP,MPn,QCISD(T) with energy-consistent relativistic effective core potential approximatio...
The equilibrium geometry and potential energy curve for the ground state of molecule LaH have been calculated on several single-reference state methods of HF,B3LYP,MPn,QCISD(T) with energy-consistent relativistic effective core potential approximatio...
2002, 18(08): 741-745
doi: 10.3866/PKU.WHXB20020814
Abstract:
Calmodulin(CaM) as a major intracellular Ca2＋ receptor, was self-assembled on Au electrode and investigated by electrochemical impedance spectroscopy(EIS). The results demonstrated that the self-assembly process of CaM could be divided into rapid and...
Calmodulin(CaM) as a major intracellular Ca2＋ receptor, was self-assembled on Au electrode and investigated by electrochemical impedance spectroscopy(EIS). The results demonstrated that the self-assembly process of CaM could be divided into rapid and...
2002, 18(08): 746-749
doi: 10.3866/PKU.WHXB20020815
Abstract:
The new mixed metal cluster (μ3-S)FeCo2(CO)7(dppfe) (2) (dppfe= Ph2PC5H4FeC5H4PPh2) has been synthesized by facile substitution reaction, in which dppfe replaces two equatorial carbonyls from two Co(CO)3 groups, respectively. IR, 1H NMR, MS and X-ray...
The new mixed metal cluster (μ3-S)FeCo2(CO)7(dppfe) (2) (dppfe= Ph2PC5H4FeC5H4PPh2) has been synthesized by facile substitution reaction, in which dppfe replaces two equatorial carbonyls from two Co(CO)3 groups, respectively. IR, 1H NMR, MS and X-ray...
2002, 18(08): 750-753
doi: 10.3866/PKU.WHXB20020816
Abstract:
Supercapacitors are playing great roles in research-and-development field of power engineering as a new energy store device. The porous carbon material developed in our laboratory exhibits perfect physical structure and properties. Its od electroche...
Supercapacitors are playing great roles in research-and-development field of power engineering as a new energy store device. The porous carbon material developed in our laboratory exhibits perfect physical structure and properties. Its od electroche...
2002, 18(08): 754-758
doi: 10.3866/PKU.WHXB20020817
Abstract:
ZnO nanoparticles were prepared by calcining the precursor, zinc carbonate hydroxide,and Pd/ZnO and Ag/ZnO composite nanoparticles with the noble metal content of 0.5％(mass fraction) were obtained by photoreduction method. The as-prepared samples w...
ZnO nanoparticles were prepared by calcining the precursor, zinc carbonate hydroxide,and Pd/ZnO and Ag/ZnO composite nanoparticles with the noble metal content of 0.5％(mass fraction) were obtained by photoreduction method. The as-prepared samples w...
Product Distribution of Conversions of Methane and Carbon Dioxide Using Dielectric Barrier Discharge
2002, 18(08): 759-763
doi: 10.3866/PKU.WHXB20020818
Abstract:
Direct conversion of methane to more useful chemicals and fuels remains a challenge for the 21st century because of the high stability of methane molecule. In this work, direct conversion of methane and carbon dioxide using dielectric barrier dischar...
Direct conversion of methane to more useful chemicals and fuels remains a challenge for the 21st century because of the high stability of methane molecule. In this work, direct conversion of methane and carbon dioxide using dielectric barrier dischar...
2002, 18(08): 764-768
doi: 10.3866/PKU.WHXB20020819
Abstract:
The cyclic voltammetry and potentiostatic electrolysis were used to investigate the preparation of Er-Ni-Co alloy films in LiClO4-DMSO system. Experimental results indicate that Er-Ni-Co alloy films containing Er from 9.21％ to 18.90％ were prepared fr...
The cyclic voltammetry and potentiostatic electrolysis were used to investigate the preparation of Er-Ni-Co alloy films in LiClO4-DMSO system. Experimental results indicate that Er-Ni-Co alloy films containing Er from 9.21％ to 18.90％ were prepared fr...
