Peptides are functional active fragments of proteins which can provide nutrients needed for human growth and development,and they also have unique physiological activity characteristics relative to proteins.Bioactive ...Peptides are functional active fragments of proteins which can provide nutrients needed for human growth and development,and they also have unique physiological activity characteristics relative to proteins.Bioactive peptides contain a great deal of development potential.More specifically,food-derived bioactive peptides have the advantages of a wide variety of sources,unique structures,high efficiency and safety,so they have broad development prospects.This review provides an overview of the current advances regarding the preparation,functional characteristics,and structure–activity relationships of food-derived bioactive peptides.Moreover,the prospects for the future development and application of food-derived bioactive peptides are discussed.This review may provide a better understanding of foodderived bioactive peptides,and some constructive inspirations for further research and applications in the food industry.展开更多
This work analyzed the gamma ray attenuation effect from the self-absorption and shield attenuation per-spectively. An exact mathematical equation was given for the geometric factor of the cylindrical fissile material...This work analyzed the gamma ray attenuation effect from the self-absorption and shield attenuation per-spectively. An exact mathematical equation was given for the geometric factor of the cylindrical fissile material with dual shields. In addition, several approximation approaches suitable for real situation were discussed, especially in the radial and axial directions of the cylinders, since the G-factors have simple forms. Then the space distribution patterns of the G-factor were analyzed based on numerical result and effective ways to solve the geometric informa-tion of the cylindrical fissile material, the radii and the heights, were deduced. This method was checked and verified by numerical calculation. Because of the efficiency of the method, it is ideal for application in real situations, such as nuclear safeguards, which demands speed of detection and accuracy of geometric analysis.展开更多
High-resolution collinear fast-ion-beam-laser spectroscopy has been applied to investigate the optical isotope shifts for transition 4f^(4)5d^(6)K_(11/2)-(24445)°_(11/2) of NdⅡ.From the measured optical isotope ...High-resolution collinear fast-ion-beam-laser spectroscopy has been applied to investigate the optical isotope shifts for transition 4f^(4)5d^(6)K_(11/2)-(24445)°_(11/2) of NdⅡ.From the measured optical isotope shifts,changes in mean-square nuclear charge radiiδ(r^(2))(fm^(2))among five even-even neodymium isotopes have been deduced:(142,144)0.282,(144,146)0.242,(146,148)0.274,(148,150)0.404.The results are in good agreement with experimental data from electronic x-ray spectroscopy and combined optical and x-ray spectroscopy.展开更多
The single-electron detachment cross sections of Cu^(-) in collision with He have been measured in the range of 10-30keV by a growth rate method. The typical value of the cross section is 7.63×10-16 cm^(2) at an ...The single-electron detachment cross sections of Cu^(-) in collision with He have been measured in the range of 10-30keV by a growth rate method. The typical value of the cross section is 7.63×10-16 cm^(2) at an energy of 20 keV. The experimental uncertainty of the results is about ±8%.展开更多
The isotope shifts and hyperfine structures of seven optical transitions for all seven stable isotopes of Nd II were measured by using collinear fast-ion-beam laser spectroscopy.The nuclear parameterλwas obtained fro...The isotope shifts and hyperfine structures of seven optical transitions for all seven stable isotopes of Nd II were measured by using collinear fast-ion-beam laser spectroscopy.The nuclear parameterλwas obtained from the measured optical isotope shifts for all seven stable isotopes with improved accuracy.Theλvalues were analysed by using the Fermi distribution for the nuclear charge density.The values of δ<r^(2)>,δ<r^(4)>and δ<r^(6)>were determined.展开更多
Atomic spectra of singly ionized neodymium have been measured by collinear fast-ion-beam laser spectroscopy.The resonant spectra in the lines of 568.9,570.8,572.7,and 574.1 nm in NdH were obtained and the optical shif...Atomic spectra of singly ionized neodymium have been measured by collinear fast-ion-beam laser spectroscopy.The resonant spectra in the lines of 568.9,570.8,572.7,and 574.1 nm in NdH were obtained and the optical shifts were determined.We obtained the optical shifts of all the five even isotopes(142-150)in Nd IL The accuracy of our results was improved by one order of magnitude compared with other published results.展开更多
Stopping powers of ^(7)Li ions in silicon single crystal at 1-5 MeV in random and<111>channeling directions were determined in iransmission geometry,with the uncertainties less than 6%.The measured results were ...Stopping powers of ^(7)Li ions in silicon single crystal at 1-5 MeV in random and<111>channeling directions were determined in iransmission geometry,with the uncertainties less than 6%.The measured results were compared with the available literature results and the values of TRIM-91 and TRIM-95.展开更多
Theγresonant absorption method has been used to determine the parameters of the 11.5MeV level in ^(24)Mg.Two dips were observed beyond our expectations.They are identified as the resonant absorptions caused by the sp...Theγresonant absorption method has been used to determine the parameters of the 11.5MeV level in ^(24)Mg.Two dips were observed beyond our expectations.They are identified as the resonant absorptions caused by the splitting energy levels at 11.52MeV.The energies of the corresponding states are 11519.8±0.4keV and 11520.7±0.4keV with 22.6±3.4eV and 10.0±2.9eV total level widths respectively.The fine structure and the relevant parameters of 11.52MeV state in ^(24)Mg are given for the first time.The potential of the high resolution in the resonant absorption methodic clearly demonstrated in present paper.展开更多
基金supported by the National Natural Science Foundation of China(U1905202,31972017,and 31771922)the National Key R&D Program of China(2018YFD0901006)+2 种基金the Fujian Major Project of Provincial Science&Technology Hall,China(2020NZ010008)the Open Project of the Key Laboratory of Refrigeration and Conditioning Aquatic Products Processing,Ministry of Agriculture and Rural Affairs,China(KLRCAPP2021-03)the Quanzhou Science&Technology Project,China(2019C085R)。
文摘Peptides are functional active fragments of proteins which can provide nutrients needed for human growth and development,and they also have unique physiological activity characteristics relative to proteins.Bioactive peptides contain a great deal of development potential.More specifically,food-derived bioactive peptides have the advantages of a wide variety of sources,unique structures,high efficiency and safety,so they have broad development prospects.This review provides an overview of the current advances regarding the preparation,functional characteristics,and structure–activity relationships of food-derived bioactive peptides.Moreover,the prospects for the future development and application of food-derived bioactive peptides are discussed.This review may provide a better understanding of foodderived bioactive peptides,and some constructive inspirations for further research and applications in the food industry.
基金This research project is supported by the Institute of Applied Physics and Computational Mathematics of Chinathe Foundation of Wang-Dao Scholar Program of Fudan University.
文摘This work analyzed the gamma ray attenuation effect from the self-absorption and shield attenuation per-spectively. An exact mathematical equation was given for the geometric factor of the cylindrical fissile material with dual shields. In addition, several approximation approaches suitable for real situation were discussed, especially in the radial and axial directions of the cylinders, since the G-factors have simple forms. Then the space distribution patterns of the G-factor were analyzed based on numerical result and effective ways to solve the geometric informa-tion of the cylindrical fissile material, the radii and the heights, were deduced. This method was checked and verified by numerical calculation. Because of the efficiency of the method, it is ideal for application in real situations, such as nuclear safeguards, which demands speed of detection and accuracy of geometric analysis.
基金Supported by the National Climbing Project of Chinathe National Natural Science Foundation of China under Grant No.19774016the Doctoral Research Funds of the State Education Commission of China under Grant No.9424626。
文摘High-resolution collinear fast-ion-beam-laser spectroscopy has been applied to investigate the optical isotope shifts for transition 4f^(4)5d^(6)K_(11/2)-(24445)°_(11/2) of NdⅡ.From the measured optical isotope shifts,changes in mean-square nuclear charge radiiδ(r^(2))(fm^(2))among five even-even neodymium isotopes have been deduced:(142,144)0.282,(144,146)0.242,(146,148)0.274,(148,150)0.404.The results are in good agreement with experimental data from electronic x-ray spectroscopy and combined optical and x-ray spectroscopy.
基金Supported by the National Natural Science Foundation of China under Grant No.19874015。
文摘The single-electron detachment cross sections of Cu^(-) in collision with He have been measured in the range of 10-30keV by a growth rate method. The typical value of the cross section is 7.63×10-16 cm^(2) at an energy of 20 keV. The experimental uncertainty of the results is about ±8%.
基金Supported by the National Natural Science Foundation of China under Grant No.19984015.
文摘The isotope shifts and hyperfine structures of seven optical transitions for all seven stable isotopes of Nd II were measured by using collinear fast-ion-beam laser spectroscopy.The nuclear parameterλwas obtained from the measured optical isotope shifts for all seven stable isotopes with improved accuracy.Theλvalues were analysed by using the Fermi distribution for the nuclear charge density.The values of δ<r^(2)>,δ<r^(4)>and δ<r^(6)>were determined.
基金Supported by the National Natural Science Foundation of China under Grant No.19774016.
文摘Atomic spectra of singly ionized neodymium have been measured by collinear fast-ion-beam laser spectroscopy.The resonant spectra in the lines of 568.9,570.8,572.7,and 574.1 nm in NdH were obtained and the optical shifts were determined.We obtained the optical shifts of all the five even isotopes(142-150)in Nd IL The accuracy of our results was improved by one order of magnitude compared with other published results.
文摘Stopping powers of ^(7)Li ions in silicon single crystal at 1-5 MeV in random and<111>channeling directions were determined in iransmission geometry,with the uncertainties less than 6%.The measured results were compared with the available literature results and the values of TRIM-91 and TRIM-95.
基金supported by the Science Fund of the Chinese Academy of Sciences。
文摘Theγresonant absorption method has been used to determine the parameters of the 11.5MeV level in ^(24)Mg.Two dips were observed beyond our expectations.They are identified as the resonant absorptions caused by the splitting energy levels at 11.52MeV.The energies of the corresponding states are 11519.8±0.4keV and 11520.7±0.4keV with 22.6±3.4eV and 10.0±2.9eV total level widths respectively.The fine structure and the relevant parameters of 11.52MeV state in ^(24)Mg are given for the first time.The potential of the high resolution in the resonant absorption methodic clearly demonstrated in present paper.
