The cosmological constant is necessary to be retained in Einstein’s field equations with value depending on the mass of the source. An overview of the spring theory in astrophysics and cosmology is included in this p...The cosmological constant is necessary to be retained in Einstein’s field equations with value depending on the mass of the source. An overview of the spring theory in astrophysics and cosmology is included in this paper. In short range force, the two interacting particles are point-like vertices connected by a bosonic spring. We also suspect that electron may contain negative sterile neutrino. The self energy of a point charge is not infinite so that renormalisation is not necessary.展开更多
The feasibility of the mercaptopropyl acid modified CdTe nanoparticles synthesized in aqueous solution to the labeling of biomoleculespapain via electrostatic interaction was studied in this paper. The absorption spec...The feasibility of the mercaptopropyl acid modified CdTe nanoparticles synthesized in aqueous solution to the labeling of biomoleculespapain via electrostatic interaction was studied in this paper. The absorption spectrum of CdTe papain solution became more flat than that of CdTe nanoparticles in the wavelength range from 400 to 600 nm. While the emission peak of CdTe papain solution underwent a red shift, the intrinsic emission band width was unchanged. The TEM images of monodisperse mercaptopropyl acid stabilized CdTe nanoparticles and CdTe papain solution were compared and the effect of pH of buffer solution was studied. It was proved that the red shift of the emission peak was the result of the electrostatic interaction between CdTe nanoparticles and papain.展开更多
An ultrathin film with forth generation poly(aminoamine)(PAMAM) dendrimers (methyl quaternary ammonium salt) as polycation and poly(sodium \%p\% styrenesulfonate) (PSS) as polyainon was fabricated \%via\% sequential d...An ultrathin film with forth generation poly(aminoamine)(PAMAM) dendrimers (methyl quaternary ammonium salt) as polycation and poly(sodium \%p\% styrenesulfonate) (PSS) as polyainon was fabricated \%via\% sequential deposition. It shows that the step by step depositions carried out smoothly by monitoring with UV Vis spectrometer. The multilayer film is rather flat with a mean roughness of \{0.39 nm\} determined by AFM. The average thickness of a bilayer is \{5.0 nm\} obtained from XRD, which indicates that the dendrimers molecules were compressed and possess high flattening.展开更多
Nanomaterials have been applied as antibacterial agents by virtue of their unique functioning mechanism different from that of conventional antibiotics.Cerium oxide nanoparticles(CeO2 NPs)are important antibacterial a...Nanomaterials have been applied as antibacterial agents by virtue of their unique functioning mechanism different from that of conventional antibiotics.Cerium oxide nanoparticles(CeO2 NPs)are important antibacterial agents due to their relatively low toxicity to normal cells and their distinct antibacterial mechanism based on the reversible conversion between two valence states of Ce(III)/Ce(IV).Some studies have been conducted to explore their antibacterial activities;however,systematic research reviews on the related mechanisms and influencing factors are still quite rare.In this review,we discuss the plausible mechanisms of the antibacterial activity of CeO2 NPs,analyze different influencing factors,and summarize various research reports on antibacterial effects on E.coli and S.aureus.We also propose the potential applications and prospects,and hope to provide an in-depth understanding on the antibacterial mechanism and a better guidance to the design and applications of this promising antibacterial material in the future.展开更多
文摘The cosmological constant is necessary to be retained in Einstein’s field equations with value depending on the mass of the source. An overview of the spring theory in astrophysics and cosmology is included in this paper. In short range force, the two interacting particles are point-like vertices connected by a bosonic spring. We also suspect that electron may contain negative sterile neutrino. The self energy of a point charge is not infinite so that renormalisation is not necessary.
文摘The feasibility of the mercaptopropyl acid modified CdTe nanoparticles synthesized in aqueous solution to the labeling of biomoleculespapain via electrostatic interaction was studied in this paper. The absorption spectrum of CdTe papain solution became more flat than that of CdTe nanoparticles in the wavelength range from 400 to 600 nm. While the emission peak of CdTe papain solution underwent a red shift, the intrinsic emission band width was unchanged. The TEM images of monodisperse mercaptopropyl acid stabilized CdTe nanoparticles and CdTe papain solution were compared and the effect of pH of buffer solution was studied. It was proved that the red shift of the emission peak was the result of the electrostatic interaction between CdTe nanoparticles and papain.
文摘An ultrathin film with forth generation poly(aminoamine)(PAMAM) dendrimers (methyl quaternary ammonium salt) as polycation and poly(sodium \%p\% styrenesulfonate) (PSS) as polyainon was fabricated \%via\% sequential deposition. It shows that the step by step depositions carried out smoothly by monitoring with UV Vis spectrometer. The multilayer film is rather flat with a mean roughness of \{0.39 nm\} determined by AFM. The average thickness of a bilayer is \{5.0 nm\} obtained from XRD, which indicates that the dendrimers molecules were compressed and possess high flattening.
基金support from the National Funds for Excellent Young Scientists of China (21522106)the National Key R&D Program of China (2017YFA0208000)the 111 Project (B18030) from China
文摘Nanomaterials have been applied as antibacterial agents by virtue of their unique functioning mechanism different from that of conventional antibiotics.Cerium oxide nanoparticles(CeO2 NPs)are important antibacterial agents due to their relatively low toxicity to normal cells and their distinct antibacterial mechanism based on the reversible conversion between two valence states of Ce(III)/Ce(IV).Some studies have been conducted to explore their antibacterial activities;however,systematic research reviews on the related mechanisms and influencing factors are still quite rare.In this review,we discuss the plausible mechanisms of the antibacterial activity of CeO2 NPs,analyze different influencing factors,and summarize various research reports on antibacterial effects on E.coli and S.aureus.We also propose the potential applications and prospects,and hope to provide an in-depth understanding on the antibacterial mechanism and a better guidance to the design and applications of this promising antibacterial material in the future.
