2008 Vol. 25, No. 2
Display Method:
2008, 25(2): 97-106.
doi: 10.11804/NuclPhysRev.25.02.097
Abstract:
We study the gluonic content of the Pomeron through relating the Pomeron trajectory to the observed IGJPC=0+2++ isoscalar tensor mesons. Four of these mesons satisfy the spinmass relation of the Pomeron. These Pomeronian candidates may be hybrid states. One of them, the f2(2 220) meson, can have a predominant glueball component. We address the unsettled experimental situation about the width of this meson and give a theoretical lower bound for it. We also show why this meson has not been seen in p experiments.
We study the gluonic content of the Pomeron through relating the Pomeron trajectory to the observed IGJPC=0+2++ isoscalar tensor mesons. Four of these mesons satisfy the spinmass relation of the Pomeron. These Pomeronian candidates may be hybrid states. One of them, the f2(2 220) meson, can have a predominant glueball component. We address the unsettled experimental situation about the width of this meson and give a theoretical lower bound for it. We also show why this meson has not been seen in p experiments.
2008, 25(2): 107-111.
doi: 10.11804/NuclPhysRev.25.02.107
Abstract:
The continuous medium model with shell correction from Nilsson model is used to study the ground state properties of heavy nuclei (Z≥82). New parameters are obtained for the continuous medium model by fitting the experimental binding energies. The theoretical calculations for the masses and radii are in good agreements with experimental values， and the rootmeansquare deviations are about 0.8 MeV for the masses， and about 0.07 fm for the radii.
The continuous medium model with shell correction from Nilsson model is used to study the ground state properties of heavy nuclei (Z≥82). New parameters are obtained for the continuous medium model by fitting the experimental binding energies. The theoretical calculations for the masses and radii are in good agreements with experimental values， and the rootmeansquare deviations are about 0.8 MeV for the masses， and about 0.07 fm for the radii.
2008, 25(2): 112-116.
doi: 10.11804/NuclPhysRev.25.02.112
Abstract:
In the framework of relativistic mean field (RMF)theory， we use BCS approximation to calculate Ce， Gd and Yb isotopic chains with different pairing parameters. And found whether they can show shell structure are different， but other physical quantities are similar by using different kinds of pairing parameters， both can correctly reproduce the experimental binding energies， twoneutron separation energy and potential curves.
In the framework of relativistic mean field (RMF)theory， we use BCS approximation to calculate Ce， Gd and Yb isotopic chains with different pairing parameters. And found whether they can show shell structure are different， but other physical quantities are similar by using different kinds of pairing parameters， both can correctly reproduce the experimental binding energies， twoneutron separation energy and potential curves.
2008, 25(2): 117-122.
doi: 10.11804/NuclPhysRev.25.02.117
Abstract:
The ground state properties of eveneven O， Ne， Mg， Si， S， Ar， Ca and Ni isotopes were studied with the selfconsistent deformed relativistic mean field theory with NL3 parameter set. The calculated results of O and Mg isotopes were presented in detail. The calculated binding energies and the twoneutron separation energies were in good agreement with experimental values. By examining the twoneutron separation energies， it was suggested that 30O， 38Ne， 42Mg， 52Si， 54S， 60Ar， 80Ca and 98Ni are the twoneutron drip line nuclei. We also briefly discussed the possible changes of neutron magic numbers in Ca and Ni isotopes. Key words： relativistic mean field; drip line nucleus; twoneutron separation energy
The ground state properties of eveneven O， Ne， Mg， Si， S， Ar， Ca and Ni isotopes were studied with the selfconsistent deformed relativistic mean field theory with NL3 parameter set. The calculated results of O and Mg isotopes were presented in detail. The calculated binding energies and the twoneutron separation energies were in good agreement with experimental values. By examining the twoneutron separation energies， it was suggested that 30O， 38Ne， 42Mg， 52Si， 54S， 60Ar， 80Ca and 98Ni are the twoneutron drip line nuclei. We also briefly discussed the possible changes of neutron magic numbers in Ca and Ni isotopes. Key words： relativistic mean field; drip line nucleus; twoneutron separation energy
2008, 25(2): 123-128.
doi: 10.11804/NuclPhysRev.25.02.123
Abstract:
A method of studying the effect about cold yoke on the superconducting solenoid is introduced in this paper. In this method the uniform design table was used to arrange experiments. And then these experiments were executed by OPERA software package. Finally， the results were analyzed by the Stepwise Regression Analysis. An example according to the method is described and the reliability of this method is also proved.
A method of studying the effect about cold yoke on the superconducting solenoid is introduced in this paper. In this method the uniform design table was used to arrange experiments. And then these experiments were executed by OPERA software package. Finally， the results were analyzed by the Stepwise Regression Analysis. An example according to the method is described and the reliability of this method is also proved.
2008, 25(2): 129-134.
doi: 10.11804/NuclPhysRev.25.02.129
Abstract:
Shanghai Laser Electron Gamma Source (SLEGS) is a highintensity， shortpulse and compact γray source which is based on inverse Compton scattering via interaction between pulsed highpower laser beams and picosecond relativistic electron bunches. One of the attractive features of the laser Compton scattering is the easy control of polarization of the produced high energy photons that duplicates polarization of the applied laser beam. The γray with energy up to 22 MeV and intensity of 109—1011 s1 are expected to be produced by Compton backscattering of CO2 laser photons on the 3.5 GeV electrons bunches in the Shanghai Synchrotron Radiation Facility (SSRF). In this communication， we report same simulation results and the progressing status of SLEGS.
Shanghai Laser Electron Gamma Source (SLEGS) is a highintensity， shortpulse and compact γray source which is based on inverse Compton scattering via interaction between pulsed highpower laser beams and picosecond relativistic electron bunches. One of the attractive features of the laser Compton scattering is the easy control of polarization of the produced high energy photons that duplicates polarization of the applied laser beam. The γray with energy up to 22 MeV and intensity of 109—1011 s1 are expected to be produced by Compton backscattering of CO2 laser photons on the 3.5 GeV electrons bunches in the Shanghai Synchrotron Radiation Facility (SSRF). In this communication， we report same simulation results and the progressing status of SLEGS.
2008, 25(2): 135-138.
doi: 10.11804/NuclPhysRev.25.02.135
Abstract:
Proton beam behavior at the normal direction of the rear surface of the target produced from ultraintense short pulse laser irradiated Au/CH double layers targets was explored on SILEXI laser facility. With the same thickness of Au layer，the proton beam flux decreases with the increasing of CH layer thickness，and the corresponding spatial profile of proton beam shows ring， filament，and disc like distribution. The energy of proton beam was not beyond 2.75 MeV in our experiment.
Proton beam behavior at the normal direction of the rear surface of the target produced from ultraintense short pulse laser irradiated Au/CH double layers targets was explored on SILEXI laser facility. With the same thickness of Au layer，the proton beam flux decreases with the increasing of CH layer thickness，and the corresponding spatial profile of proton beam shows ring， filament，and disc like distribution. The energy of proton beam was not beyond 2.75 MeV in our experiment.
2008, 25(2): 139-143.
doi: 10.11804/NuclPhysRev.25.02.139
Abstract:
The point spread function (PSF) of a pinhole imaging system for fast neutron has been studied through MonteCarlo method. The PSFs under different conditions have been obtained and analyzed by fitting the simulating data with Gauss function. As the results show， when the excursion is little， the PSF obtained by Gauss function fitting is feasible. A baffle will reduce the error and improve the spatial resolution remarkably.
The point spread function (PSF) of a pinhole imaging system for fast neutron has been studied through MonteCarlo method. The PSFs under different conditions have been obtained and analyzed by fitting the simulating data with Gauss function. As the results show， when the excursion is little， the PSF obtained by Gauss function fitting is feasible. A baffle will reduce the error and improve the spatial resolution remarkably.
2008, 25(2): 144-147.
doi: 10.11804/NuclPhysRev.25.02.144
Abstract:
Ptype crystalline Si with (100) orientation was implanted by He ions with energy of 30 keV to a fluence of 5×1016 ions/cm2 . After implantation， pieces of these samples were subjected to thermal annealing at temperatures ranging from 600 ℃ to 1 000 ℃. The microstructures of the annealed sample surfaces were investigated by Atom Force Microscopy (AFM). It was found that the sample surfaces exhibited distinct morphological evolution with annealing temperature. The results were discussed by assuming that the near surface region contains a high ratio of He atoms to vacancies， which lead to the formation of highly pressurized He bubbles and consequently the change of sample surface via bubbles growth and helium release.
Ptype crystalline Si with (100) orientation was implanted by He ions with energy of 30 keV to a fluence of 5×1016 ions/cm2 . After implantation， pieces of these samples were subjected to thermal annealing at temperatures ranging from 600 ℃ to 1 000 ℃. The microstructures of the annealed sample surfaces were investigated by Atom Force Microscopy (AFM). It was found that the sample surfaces exhibited distinct morphological evolution with annealing temperature. The results were discussed by assuming that the near surface region contains a high ratio of He atoms to vacancies， which lead to the formation of highly pressurized He bubbles and consequently the change of sample surface via bubbles growth and helium release.
2008, 25(2): 148-153.
doi: 10.11804/NuclPhysRev.25.02.148
Abstract:
To gain a better understanding of the molecular basis of the biological effects induced by heavy ion irradiation， total proteins extracted from human hepatoma HepG2 cells that unirradiated and irradiated with an intermediateenergy carbon ion beam at 1 Gy were separated by twodimensional gel electrophoresis (2DE) with immobilized pH gradients (IPGs). The 2DE profiles were analyzed with the ImageMaster 2D software. More than 500 proteins spots were reproducibly detected on each gel and 17 were differentially expressed for the unirradiated and irradiated cells. 1 protein was expressed only in the unirradiated cells. 8 proteins were downregulated and 8 proteins were upregulated after the carbon ion irradiation. In this study， reproducible 2DE profiles were established and some differential expressed proteins were detected. These basic data are very useful for the further study of heavyion biological effect.
To gain a better understanding of the molecular basis of the biological effects induced by heavy ion irradiation， total proteins extracted from human hepatoma HepG2 cells that unirradiated and irradiated with an intermediateenergy carbon ion beam at 1 Gy were separated by twodimensional gel electrophoresis (2DE) with immobilized pH gradients (IPGs). The 2DE profiles were analyzed with the ImageMaster 2D software. More than 500 proteins spots were reproducibly detected on each gel and 17 were differentially expressed for the unirradiated and irradiated cells. 1 protein was expressed only in the unirradiated cells. 8 proteins were downregulated and 8 proteins were upregulated after the carbon ion irradiation. In this study， reproducible 2DE profiles were established and some differential expressed proteins were detected. These basic data are very useful for the further study of heavyion biological effect.
2008, 25(2): 154-159.
doi: 10.11804/NuclPhysRev.25.02.154
Abstract:
The effect of the phantom thickness on the simulation speed and efficiency of Monte Carlo (MC) codes, MCNP4c, DOSXYZnrc, DOSRZnrc and DPM, is investigated. The result shows that the increases of the simulation speed for different MC codes are distinct difference with dicreasing the phantom thickness, in which DOSXYZnrc is the most one, and DOSRZnrc is the least one. In the viewpoint of MC efficiency, DPM and DOSRZnrc have the remarkable advantages over others; and the efficiency for the thinner phantom shows the consistent advantage over the thicker one for these MC codes. In the viewpoint of MC efficiency increase, MCNP4c, DOSXYZnrc and DOSRZnrc show the same comparability, but DPM shows relatively low characteristics. The strange characteristics of DOSRZnrc in statistical uncertainty, speed increase are further investigated to find that it is due to the photon forcing VRT (variance reduction technique) implemented in it. This VRT reduces the statistical uncertainty, but it also weakens the speed advantage of the thinner phantom. However it is due to the remarkably under estimate of the variance on the interest region, the MC efficiency of DOSRZnrc is still increasing for the thinner phantom.
The effect of the phantom thickness on the simulation speed and efficiency of Monte Carlo (MC) codes, MCNP4c, DOSXYZnrc, DOSRZnrc and DPM, is investigated. The result shows that the increases of the simulation speed for different MC codes are distinct difference with dicreasing the phantom thickness, in which DOSXYZnrc is the most one, and DOSRZnrc is the least one. In the viewpoint of MC efficiency, DPM and DOSRZnrc have the remarkable advantages over others; and the efficiency for the thinner phantom shows the consistent advantage over the thicker one for these MC codes. In the viewpoint of MC efficiency increase, MCNP4c, DOSXYZnrc and DOSRZnrc show the same comparability, but DPM shows relatively low characteristics. The strange characteristics of DOSRZnrc in statistical uncertainty, speed increase are further investigated to find that it is due to the photon forcing VRT (variance reduction technique) implemented in it. This VRT reduces the statistical uncertainty, but it also weakens the speed advantage of the thinner phantom. However it is due to the remarkably under estimate of the variance on the interest region, the MC efficiency of DOSRZnrc is still increasing for the thinner phantom.
2008, 25(2): 161-164.
doi: 10.11804/NuclPhysRev.25.02.161
Abstract:
Heavy-ion accelerator facilities for the researches on biological effects induced by heavyion at Institute of Modern Physics（IMP）， Chinese Academy of Sciences and National Laboratory of Heavyion Accelerator in Lanzhou（HLHIAL） are introduced. New progresses in modern agriculture and biological industry are presented.
Heavy-ion accelerator facilities for the researches on biological effects induced by heavyion at Institute of Modern Physics（IMP）， Chinese Academy of Sciences and National Laboratory of Heavyion Accelerator in Lanzhou（HLHIAL） are introduced. New progresses in modern agriculture and biological industry are presented.
2008, 25(2): 165-170.
doi: 10.11804/NuclPhysRev.25.02.165
Abstract:
In recent years, the intermediate energy heavy ion biology has been concerned rarely comparing to that of the lowenergy ions. In this paper, we summarized the advantage of a new mutation breeding method mediated by intermediate energy heavy ion irradiations. Meanwhile, the present state of this mutation technique in applications of the breeding in grain crops, cash crops and model plants were introduced. And the preview of the heavy ion irradiations in genetransfer, molecular marker assisted selection and spaceflight mutation breeding operations were also presented.
In recent years, the intermediate energy heavy ion biology has been concerned rarely comparing to that of the lowenergy ions. In this paper, we summarized the advantage of a new mutation breeding method mediated by intermediate energy heavy ion irradiations. Meanwhile, the present state of this mutation technique in applications of the breeding in grain crops, cash crops and model plants were introduced. And the preview of the heavy ion irradiations in genetransfer, molecular marker assisted selection and spaceflight mutation breeding operations were also presented.
2008, 25(2): 171-175.
doi: 10.11804/NuclPhysRev.25.02.171
Abstract:
The total 89 plant height mutant lines induced from rice cultivars Nipponbare and “9311” by ion beam implantation and γrays irradiation were used for analysis of the correlation between plant height and yield component. The results indicated spike length, ear grains, thousandgrain weight, stem dry weight and yield have significantly positive correlation with the plant height, while the number of productive ear has significant negative correlation with it. The correlation analysis of the plant height and yield component will help to reveal the influence of the plant height and the factors of yield component.
The total 89 plant height mutant lines induced from rice cultivars Nipponbare and “9311” by ion beam implantation and γrays irradiation were used for analysis of the correlation between plant height and yield component. The results indicated spike length, ear grains, thousandgrain weight, stem dry weight and yield have significantly positive correlation with the plant height, while the number of productive ear has significant negative correlation with it. The correlation analysis of the plant height and yield component will help to reveal the influence of the plant height and the factors of yield component.
2008, 25(2): 176-181.
doi: 10.11804/NuclPhysRev.25.02.176
Abstract:
In order to study biological effects of heavy ion irradiation on maize inbred lines， the agronomic traits and photosynthetic rates were investigated from M1 to M3 of maize seeds irradiated with 12C6+ and 36Ar18+ ions．The results showed that the germination rate and planting percent of maize seeds irradiated were decrease as dosage increasing of heavy ion irradiation. Different physiological status of seeds had disparate sensibility to heavy-ion irradiation and the suitable dosage of 12C6+ ion irradiation was 20—25 Gy for dry maize seeds. The leaf type of the plant happened visible changes in M1 generation. The plant height， spike position， spike number per plant， anther color of staminate，grain texture，spike row，grain weight and resistance had changes in M2 generation. Among them occurred some beneficial mutations that include degrading of plant height and spike position height， multispike at same position in the plant， increasing of pike row and grain change of grain texture from powder seed to hard seed，resistance to rust disease and red leaf disease and so on. The frequency of beneficial mutation was 7.0％—17.9％. Those beneficial mutations could be stably inherited and mutant plants with high photosynthetic efficiency emerged in M3 generation. The study above showed that heavy ion irradiation is a high performance means for improvement germplasm of maize.
In order to study biological effects of heavy ion irradiation on maize inbred lines， the agronomic traits and photosynthetic rates were investigated from M1 to M3 of maize seeds irradiated with 12C6+ and 36Ar18+ ions．The results showed that the germination rate and planting percent of maize seeds irradiated were decrease as dosage increasing of heavy ion irradiation. Different physiological status of seeds had disparate sensibility to heavy-ion irradiation and the suitable dosage of 12C6+ ion irradiation was 20—25 Gy for dry maize seeds. The leaf type of the plant happened visible changes in M1 generation. The plant height， spike position， spike number per plant， anther color of staminate，grain texture，spike row，grain weight and resistance had changes in M2 generation. Among them occurred some beneficial mutations that include degrading of plant height and spike position height， multispike at same position in the plant， increasing of pike row and grain change of grain texture from powder seed to hard seed，resistance to rust disease and red leaf disease and so on. The frequency of beneficial mutation was 7.0％—17.9％. Those beneficial mutations could be stably inherited and mutant plants with high photosynthetic efficiency emerged in M3 generation. The study above showed that heavy ion irradiation is a high performance means for improvement germplasm of maize.
2008, 25(2): 182-186.
doi: 10.11804/NuclPhysRev.25.02.182
Abstract:
Crops of Brassica napus L.， Linum usitatissmum L.， Allium fistulosum L. and Lens culinaris Medic. were irradiated by 80 MeV/u 12C6+ ion beams with doses of 30， 90 and 180 Gy. The germination rates and heights of seedlings of M1 and M2 generation of these four plants were studied. The results indicated that germination rates and average heights of the B. napus and L. usitatissmum were improved by appropriate dose treatment， while great suppression was found in the irradiated groups of the A. fistulosum. As far as the L. Culinaris was concerned， little differences was observed on M1 germination rate， but the 90 Gy irradiation was favorable to growth of plant. The treatments with 30， 90 and 180 Gy were inferior to contrast one on M2 germination rate of the four species. Seedlings of M2 generation of the B. napus， L. sitatissmum and L. culinaris under 30 Gy grew better than the other groups， while the best performance of the A. fistulosum was shown by the control group.
Crops of Brassica napus L.， Linum usitatissmum L.， Allium fistulosum L. and Lens culinaris Medic. were irradiated by 80 MeV/u 12C6+ ion beams with doses of 30， 90 and 180 Gy. The germination rates and heights of seedlings of M1 and M2 generation of these four plants were studied. The results indicated that germination rates and average heights of the B. napus and L. usitatissmum were improved by appropriate dose treatment， while great suppression was found in the irradiated groups of the A. fistulosum. As far as the L. Culinaris was concerned， little differences was observed on M1 germination rate， but the 90 Gy irradiation was favorable to growth of plant. The treatments with 30， 90 and 180 Gy were inferior to contrast one on M2 germination rate of the four species. Seedlings of M2 generation of the B. napus， L. sitatissmum and L. culinaris under 30 Gy grew better than the other groups， while the best performance of the A. fistulosum was shown by the control group.
2008, 25(2): 187-190.
doi: 10.11804/NuclPhysRev.25.02.187
Abstract:
The effect of 55 MeV／u 40Ar17+ irradiation with different doses on hybrid seeds and microtubers of potatoes were studied from year 2000 to 2005. The results showed that the yields of potatoes irradiated by heavy ions grew significantly. This new mutation method combining cross breeding technique with heavy ion irradiation is more effective， which could not only increase the yield of potatoes， but also improve their quality. The optimal mutagenic dose was 60 Gy to microtubers of potatoes， 60—120 Gy to hybrid seeds， respectively. Finally， several new lines which have higher yield and better qualities were obtained through multigeneration screening from the offspring of irradiated potatoes.
The effect of 55 MeV／u 40Ar17+ irradiation with different doses on hybrid seeds and microtubers of potatoes were studied from year 2000 to 2005. The results showed that the yields of potatoes irradiated by heavy ions grew significantly. This new mutation method combining cross breeding technique with heavy ion irradiation is more effective， which could not only increase the yield of potatoes， but also improve their quality. The optimal mutagenic dose was 60 Gy to microtubers of potatoes， 60—120 Gy to hybrid seeds， respectively. Finally， several new lines which have higher yield and better qualities were obtained through multigeneration screening from the offspring of irradiated potatoes.
2008, 25(2): 191-195.
doi: 10.11804/NuclPhysRev.25.02.191
Abstract:
The somatic homologous recombination was frequently used to evaluate genome stability because it can result in DNA changes， such as rearrangement， deletion and duplication. In this paper， we used Arabidopsis thaliana transgenic for GUS recombination substrate (R2L100 and R3L66) to study the genomic instability induced by low energy ion and α particle characteristic of shortpenetrating properties. The dry seeds of R3L66 line were irradiated by 30 keV Argon ion， the Homologous Recombination Frequency (HRF) had a significant increase at dose range of 500×1013—3 000×1013 ions/cm2. The highest level of HRF was 2.42fold over the control. The 3.3 MeV α particles were used to radiate 4dayold seedlings of R2L100 line. The HRFs had a dosedependent increase at dose of 1—10 Gy， and a dosedependent decrease at 10—100 Gy. The highest level of HRF induced by α particle was 1.9fold over control at the dose of 10 Gy. These results indicate that shortpenetrating irradiation can effectively trigger the plant genomic instability at the level of plant. The local irradiation on the roots of R2L100 by α particle resulted in a 2.5fold increase of HRF in nonirradiated aerial plant，which indicates that a signal of genomic instability generated by α particle radiation can systemically travel in whole plant. It is possible that the genome instability induced by lowenergy ion is a major part of its mutagenic mechanism.
The somatic homologous recombination was frequently used to evaluate genome stability because it can result in DNA changes， such as rearrangement， deletion and duplication. In this paper， we used Arabidopsis thaliana transgenic for GUS recombination substrate (R2L100 and R3L66) to study the genomic instability induced by low energy ion and α particle characteristic of shortpenetrating properties. The dry seeds of R3L66 line were irradiated by 30 keV Argon ion， the Homologous Recombination Frequency (HRF) had a significant increase at dose range of 500×1013—3 000×1013 ions/cm2. The highest level of HRF was 2.42fold over the control. The 3.3 MeV α particles were used to radiate 4dayold seedlings of R2L100 line. The HRFs had a dosedependent increase at dose of 1—10 Gy， and a dosedependent decrease at 10—100 Gy. The highest level of HRF induced by α particle was 1.9fold over control at the dose of 10 Gy. These results indicate that shortpenetrating irradiation can effectively trigger the plant genomic instability at the level of plant. The local irradiation on the roots of R2L100 by α particle resulted in a 2.5fold increase of HRF in nonirradiated aerial plant，which indicates that a signal of genomic instability generated by α particle radiation can systemically travel in whole plant. It is possible that the genome instability induced by lowenergy ion is a major part of its mutagenic mechanism.
2008, 25(2): 196-200.
doi: 10.11804/NuclPhysRev.25.02.196
Abstract:
Angelica sinensis（Oliv）Diels new strain DGA200002 was selected successfully by Institute of Modern Physics， Chinese Academy of Sciences， Dryland Farming Research and Extension Center of Dingxi Prefecture， etc. According to the program of new strain selection， this new strain was selected for several years after the dry seeds of Gansu Angelica sinensis（Oliv）Diels 9001 was irradiated by ions of 55 MeV/u 40Ar+15. During the period of year 2005—2007， region experiments of Angelica sinensis（Oliv）Diels new strain DGA200002 were developed in Minxian， Weiyuan， Zhangxian and Longxi etc. Average yield of the fresh DGA200002 Angelica was 10 621.5 kg/hm2， and 15.0% production was increased more than control (for 1 386.0 kg/hm2 of 9001).The growth stage of the DGA200002 was 790 d， and it has deep purple stem and yellowwhite root. The quality analysis results are as follows: total ash content is 4.2% and acidfast ash content is 0.4%， 16% and 33.3% better than control， respectively; the lixivium is 61.4%， i.e., 4.4% more than the standard of Pharmacopoeia of People’s Republic of China (2005 edition); the ferulic acid content is 0.148%， i.e., 2.96 times ligher than the standard. All these results showed that the quality of the DGA200002 was better significantly than both control and the standard. It can be grown appropriately at the high， cold and dankness regions at the altitude of 2 000—2 600 m and with a annual precipitation of 500—600 mm.
Angelica sinensis（Oliv）Diels new strain DGA200002 was selected successfully by Institute of Modern Physics， Chinese Academy of Sciences， Dryland Farming Research and Extension Center of Dingxi Prefecture， etc. According to the program of new strain selection， this new strain was selected for several years after the dry seeds of Gansu Angelica sinensis（Oliv）Diels 9001 was irradiated by ions of 55 MeV/u 40Ar+15. During the period of year 2005—2007， region experiments of Angelica sinensis（Oliv）Diels new strain DGA200002 were developed in Minxian， Weiyuan， Zhangxian and Longxi etc. Average yield of the fresh DGA200002 Angelica was 10 621.5 kg/hm2， and 15.0% production was increased more than control (for 1 386.0 kg/hm2 of 9001).The growth stage of the DGA200002 was 790 d， and it has deep purple stem and yellowwhite root. The quality analysis results are as follows: total ash content is 4.2% and acidfast ash content is 0.4%， 16% and 33.3% better than control， respectively; the lixivium is 61.4%， i.e., 4.4% more than the standard of Pharmacopoeia of People’s Republic of China (2005 edition); the ferulic acid content is 0.148%， i.e., 2.96 times ligher than the standard. All these results showed that the quality of the DGA200002 was better significantly than both control and the standard. It can be grown appropriately at the high， cold and dankness regions at the altitude of 2 000—2 600 m and with a annual precipitation of 500—600 mm.
2008, 25(2): 201-203.
doi: 10.11804/NuclPhysRev.25.02.201
Abstract:
The new angelica cultivar, “DGA200002”, was selected from “Mingui No.1” after irradiated by heavy ions on its dry seeds. “DGA200002” exhibits potent disease resistance and higher yield compared to “Mingui No.1”. In this study, their phenotypes, quality and random amplified polymorphic DNA(RAPD) were analyzed, and this basic work is expected to be helpful to the coming new cultivar breeding.
The new angelica cultivar, “DGA200002”, was selected from “Mingui No.1” after irradiated by heavy ions on its dry seeds. “DGA200002” exhibits potent disease resistance and higher yield compared to “Mingui No.1”. In this study, their phenotypes, quality and random amplified polymorphic DNA(RAPD) were analyzed, and this basic work is expected to be helpful to the coming new cultivar breeding.
2008, 25(2): 204-207.
doi: 10.11804/NuclPhysRev.25.02.204
Abstract:
As a substitute for food supplies， sweet sorghum juice with high grade has demonstrated outstanding advantage in fermentation. To obtain the optimized fermentation conditions， the growth， the biomass of bread yeast cultured in sweet sorghum juice and total residual sugar were investigated in the paper. The fermentation was performed and optimized in a 10—100 l bioreactor. The results show that the application of sweet sorghum juice in bread yeast production is very potential.
As a substitute for food supplies， sweet sorghum juice with high grade has demonstrated outstanding advantage in fermentation. To obtain the optimized fermentation conditions， the growth， the biomass of bread yeast cultured in sweet sorghum juice and total residual sugar were investigated in the paper. The fermentation was performed and optimized in a 10—100 l bioreactor. The results show that the application of sweet sorghum juice in bread yeast production is very potential.
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