Incorporating low-dimensionalization technologies effectively tackle the challenge of inadequate long-term stability in hybrid halide perovskites,however their wide bandgap and strong quantum well confinement remain s...Incorporating low-dimensionalization technologies effectively tackle the challenge of inadequate long-term stability in hybrid halide perovskites,however their wide bandgap and strong quantum well confinement remain substantial obstacle for various optoelectronic applications.Addressing these issues without compromising longterm stability has emerged as a pivotal focus in materials science,in particular exploring the effects of the functional groups within spacer cations.Our simulations reveal that the robustπ-πstacking interactions involving PEA^(+)and the strong hydrogen bonding interactions between PEA^(+)and MX^(4-)_(6)contribute to narrowing the electronic bandgap in 2D monolayer PEA_(2)MX_(4)(e.g.2D monolayer PEA_(2)SnI_(4):1.34 eV)for reasonable visible-light absorption while simultaneously ensuring their favorable long-term stability.Moreover,the delocalized orbitals and relatively high dielectric constants in PEA^(+),attributed to the conjugated benzene ring,has been observed to weaken the potential barrier,exciton binding effect and quantum well confinement in 2D monolayer PEA2MX4,thus facilitating photogenerated electron-hole separations and out-of-plane carrier transport.The impact of spacer cations on the optoelectronic and transport properties of 2D monolayer perovskites highlights the critical role of meticulously chosen and well-designed spacer cations,especially functional groups,in shaping their photophysical properties and ensuring long-term stability even under extremely operating conditions.展开更多
This present study investigated the ability of various soy protein hydrolysates (SPHs) in binding calcium. It was demonstrated that the amount of Ca-bound depended greatly on the SPHs obtained using different protease...This present study investigated the ability of various soy protein hydrolysates (SPHs) in binding calcium. It was demonstrated that the amount of Ca-bound depended greatly on the SPHs obtained using different proteases, which included: neutrase, flavourzyme, protease M and pepsin. The maximum level of Ca-bound (66.9 mg/g) occurred when protease M was used to hydrolyze soy protein. Peptide fragments exhibiting high Ca-binding capacity had molecular weights of either 14.4 or 8–9 kDa. The level of Ca-bound increased linearly with the increment of carboxyl content in SPHs, and further deamidation on SPHs from protease M improved Ca-binding of the hydrolysate.展开更多
Thermodynamic data were determined for the reversible binding of O 2 to two compounds of dicobalt(II) di(meso tetra phenyl)porphyrin derivatives with different lengths of diamidoaliphatic bridge (abbreviated to Co ...Thermodynamic data were determined for the reversible binding of O 2 to two compounds of dicobalt(II) di(meso tetra phenyl)porphyrin derivatives with different lengths of diamidoaliphatic bridge (abbreviated to Co 2PP 8 and Co 2PP 4) in N,N dimethylformamide at room temperature. The partial pressure of dioxygen necessary for half oxygenation ( P 1/2 ) and Hill coefficient ( n ) at 298 K were determined as follows: P 1/2 =54.2 kPa, n =2.0 for Co 2PP 8 and P 1/2 =6.8 kPa, n =1.8 for Co 2PP 4,respectively. The rate equations of reversible oxygen binding by Co 2PP 8 were determined and the reaction path was proposed. The results of thermodynamic and kinetic studies indicate that there exists strong cooperative effect during oxygenation of the compounds. The ESR observation reveals that the dioxygen complexes formed in the solutions are of superoxo (Co O - 2) type.展开更多
Objective To investigate the effects of insulin-like growth factor binding protein 7(IGFBP7)on the proliferation,cell cycle of gastric cancer cell and the expression of cynlin D1,cyclin-dependent kinase(CDK)4,and to o...Objective To investigate the effects of insulin-like growth factor binding protein 7(IGFBP7)on the proliferation,cell cycle of gastric cancer cell and the expression of cynlin D1,cyclin-dependent kinase(CDK)4,and to observe the effects of IGFBP7 on the growth of gastric tumor xenografts in nude mice.Methods The MKN-28cell line was interfered by small interfere ribonucleic acid(siRNA)(interfered group),and blank control group,展开更多
This study investigated the role of three rangeland species viz.Agropyron trichophorum,Medicago sativa,and Lolium prenne on mitigating of effects of a freeze-thaw(FT)cycle on runoff generation and soil loss from small...This study investigated the role of three rangeland species viz.Agropyron trichophorum,Medicago sativa,and Lolium prenne on mitigating of effects of a freeze-thaw(FT)cycle on runoff generation and soil loss from small experimental plots.Small plots(0.5×0.5m)were prepared in three replicates for control(i.e.,under a FT cycle only)and treatments(i.e.,individually planted with the study species and subject to a FT cycle).The treated plots were then placed at a slope of 20%and subjected to simulated rainfall with intensity of 70 mm h-1 and 30 min duration.The results of the study showed a significant effect(P<0.05)of the plants on controlling runoff and soil loss after a FT cycle.Also,the detrimental effects of the FT cycle due to performance of ice lenses and formation of an active melting layer in the soil surface were ameliorated by the presence of litter on the soil and root-binding effect of the plants.Time to runoff increased by 54,111 and 10%,runoff volume decreased by 27,68 and 0.4%and soil loss changed by-34,-62,and+6.5%in the plots planted with A.trichophorum,L.prenne and M.sativa,respectively.The results of the current study indicated that L.prenne had the maximum benefit on reducing runoff and soil loss from the plots undergoing a FT cycle.展开更多
The diffusion kinetics of a molecular probe-rhodamine B-in ternary aqueous solutions containing poly(vinyl alcohol),glycerol,and surfactants was investigated using fluorescence correlation spectroscopy and dynamic lig...The diffusion kinetics of a molecular probe-rhodamine B-in ternary aqueous solutions containing poly(vinyl alcohol),glycerol,and surfactants was investigated using fluorescence correlation spectroscopy and dynamic light scattering.We show that the diffusion characteristics of rhodamine B in such complex systems is determined by a synergistic effect of molecular crowding and intermolecular interactions between chemical species.The presence of glycerol has no noticeable impact on rhodamine B diffusion at low concentration,but significantly slows down the diffiision of rhodamine B above 3.9%(w/v)due to a dominating steric inhibition effect.Furthermore,introducing surfactants(cationic/nonionic/anionic)to the system results in a decreased diffusion coefficient of the molecular probe.In solutions containing nonionic surfactant,this can be explained by an increased crowding effect.For ternary poly(vinyl alcohol)solutions containing cationic or anionic surfactant,surfactant-polymer and surfactant-rhodamine B interactions alongside the crowding effect of the molecules slow down the overall diffiisivity of rhodamine B.The results advance our insight of molecular migration in a broad range of industrial complex formulations that incorporate multiple compounds,and highlight the importance of selecting the appropriate additives and surfactants in formulated products.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.22103012,22173104)Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(FJOEL,Grant No.2021ZR109)the Future-prospective and Stride-across Programs of Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences(Grant No.CXZX-2022-GH02)。
文摘Incorporating low-dimensionalization technologies effectively tackle the challenge of inadequate long-term stability in hybrid halide perovskites,however their wide bandgap and strong quantum well confinement remain substantial obstacle for various optoelectronic applications.Addressing these issues without compromising longterm stability has emerged as a pivotal focus in materials science,in particular exploring the effects of the functional groups within spacer cations.Our simulations reveal that the robustπ-πstacking interactions involving PEA^(+)and the strong hydrogen bonding interactions between PEA^(+)and MX^(4-)_(6)contribute to narrowing the electronic bandgap in 2D monolayer PEA_(2)MX_(4)(e.g.2D monolayer PEA_(2)SnI_(4):1.34 eV)for reasonable visible-light absorption while simultaneously ensuring their favorable long-term stability.Moreover,the delocalized orbitals and relatively high dielectric constants in PEA^(+),attributed to the conjugated benzene ring,has been observed to weaken the potential barrier,exciton binding effect and quantum well confinement in 2D monolayer PEA2MX4,thus facilitating photogenerated electron-hole separations and out-of-plane carrier transport.The impact of spacer cations on the optoelectronic and transport properties of 2D monolayer perovskites highlights the critical role of meticulously chosen and well-designed spacer cations,especially functional groups,in shaping their photophysical properties and ensuring long-term stability even under extremely operating conditions.
文摘This present study investigated the ability of various soy protein hydrolysates (SPHs) in binding calcium. It was demonstrated that the amount of Ca-bound depended greatly on the SPHs obtained using different proteases, which included: neutrase, flavourzyme, protease M and pepsin. The maximum level of Ca-bound (66.9 mg/g) occurred when protease M was used to hydrolyze soy protein. Peptide fragments exhibiting high Ca-binding capacity had molecular weights of either 14.4 or 8–9 kDa. The level of Ca-bound increased linearly with the increment of carboxyl content in SPHs, and further deamidation on SPHs from protease M improved Ca-binding of the hydrolysate.
文摘Thermodynamic data were determined for the reversible binding of O 2 to two compounds of dicobalt(II) di(meso tetra phenyl)porphyrin derivatives with different lengths of diamidoaliphatic bridge (abbreviated to Co 2PP 8 and Co 2PP 4) in N,N dimethylformamide at room temperature. The partial pressure of dioxygen necessary for half oxygenation ( P 1/2 ) and Hill coefficient ( n ) at 298 K were determined as follows: P 1/2 =54.2 kPa, n =2.0 for Co 2PP 8 and P 1/2 =6.8 kPa, n =1.8 for Co 2PP 4,respectively. The rate equations of reversible oxygen binding by Co 2PP 8 were determined and the reaction path was proposed. The results of thermodynamic and kinetic studies indicate that there exists strong cooperative effect during oxygenation of the compounds. The ESR observation reveals that the dioxygen complexes formed in the solutions are of superoxo (Co O - 2) type.
文摘Objective To investigate the effects of insulin-like growth factor binding protein 7(IGFBP7)on the proliferation,cell cycle of gastric cancer cell and the expression of cynlin D1,cyclin-dependent kinase(CDK)4,and to observe the effects of IGFBP7 on the growth of gastric tumor xenografts in nude mice.Methods The MKN-28cell line was interfered by small interfere ribonucleic acid(siRNA)(interfered group),and blank control group,
基金The present research has been prepared based on the facilities provided by Tarbiat Modares University,IranThe partial support of the Agrohydrology Research Group of Tarbiat Modares University(grant No.IG-39713)
文摘This study investigated the role of three rangeland species viz.Agropyron trichophorum,Medicago sativa,and Lolium prenne on mitigating of effects of a freeze-thaw(FT)cycle on runoff generation and soil loss from small experimental plots.Small plots(0.5×0.5m)were prepared in three replicates for control(i.e.,under a FT cycle only)and treatments(i.e.,individually planted with the study species and subject to a FT cycle).The treated plots were then placed at a slope of 20%and subjected to simulated rainfall with intensity of 70 mm h-1 and 30 min duration.The results of the study showed a significant effect(P<0.05)of the plants on controlling runoff and soil loss after a FT cycle.Also,the detrimental effects of the FT cycle due to performance of ice lenses and formation of an active melting layer in the soil surface were ameliorated by the presence of litter on the soil and root-binding effect of the plants.Time to runoff increased by 54,111 and 10%,runoff volume decreased by 27,68 and 0.4%and soil loss changed by-34,-62,and+6.5%in the plots planted with A.trichophorum,L.prenne and M.sativa,respectively.The results of the current study indicated that L.prenne had the maximum benefit on reducing runoff and soil loss from the plots undergoing a FT cycle.
基金School of Chemical Engineering,University of Birmingham,and Engineering&Physical Science Research Council(EPSRC)with grant number EP/P007864/1ZJZ acknowledges an Industrial Fellowship with P&G,funded by the Royal Academy of Engineering(IF2021\100).
文摘The diffusion kinetics of a molecular probe-rhodamine B-in ternary aqueous solutions containing poly(vinyl alcohol),glycerol,and surfactants was investigated using fluorescence correlation spectroscopy and dynamic light scattering.We show that the diffusion characteristics of rhodamine B in such complex systems is determined by a synergistic effect of molecular crowding and intermolecular interactions between chemical species.The presence of glycerol has no noticeable impact on rhodamine B diffusion at low concentration,but significantly slows down the diffiision of rhodamine B above 3.9%(w/v)due to a dominating steric inhibition effect.Furthermore,introducing surfactants(cationic/nonionic/anionic)to the system results in a decreased diffusion coefficient of the molecular probe.In solutions containing nonionic surfactant,this can be explained by an increased crowding effect.For ternary poly(vinyl alcohol)solutions containing cationic or anionic surfactant,surfactant-polymer and surfactant-rhodamine B interactions alongside the crowding effect of the molecules slow down the overall diffiisivity of rhodamine B.The results advance our insight of molecular migration in a broad range of industrial complex formulations that incorporate multiple compounds,and highlight the importance of selecting the appropriate additives and surfactants in formulated products.
