Soil erosion accelerates soil degradation. Some natural soils and cultivated soils on sloping land in southern Jiangsu Province, China were chosen to study soil degradation associated with erosion. Soil erosion intens...Soil erosion accelerates soil degradation. Some natural soils and cultivated soils on sloping land in southern Jiangsu Province, China were chosen to study soil degradation associated with erosion. Soil erosion intensity was investigated using the 137Cs tracer method. Soil particle-size distribution, soil organic matter (OM), total nitrogen (TN) and total phosphorus (TP) were measured, and the effects of erosion on soil physical and chemical properties were analyzed statistically using SYSTAT8.0. Results indicated that erosion intensity of cultivated soils was greater than that of the natural soils, suggesting that cultivation increased soil loss. Erosion also led to an increase of coarser soil particle proportion, especially in natural soils. In addition, silt was the primary soil particle lost due to erosion. However, in cultivated fields, coarser soil particles over time were attributed not only to soil erosion but also to mechanical eluviation as a result of farming activities. Moreover, erosion caused a decrease in soil OM, TN and TP as well as thinning of the soil layer.展开更多
In this paper, removal of NOx(namely DeNOx) from flue gas by radical injection combined with NaOH solution(26% by weight of NaOH in water) scrubbing was investigated. The experimental results showed that the steady st...In this paper, removal of NOx(namely DeNOx) from flue gas by radical injection combined with NaOH solution(26% by weight of NaOH in water) scrubbing was investigated. The experimental results showed that the steady streamer corona occurs through adjusting the flow rate of the oxygen fed into the nozzles electrode. The vapor in the oxygen has influence on the V I characteristics of corona discharge. Both HNO 2 and HNO 3 come into being in the plasma reactor and the DeNOx efficiency in the plasma reactor is more than 60%. The overall DeNOx efficiency of the whole system reaches 81 7% when the NaOH solution scrubbing is collaborated.展开更多
At present, the higher vocational education system is constantly improving. Mechanical drawing teaching has great influence on the cultivation of professional talents. All aspects of teaching concepts and methods shou...At present, the higher vocational education system is constantly improving. Mechanical drawing teaching has great influence on the cultivation of professional talents. All aspects of teaching concepts and methods should be innovated and better combined with national talent demand, so as to better optimize the effect of teaching reform and effectively arrange all aspects of education. The reform of mechanical drawing teaching in higher vocational colleges should introduce advanced teaching techniques and concepts, strengthen teachers training, strengthen teachers strength, continuously innovate teaching contents, closely combine with current affairs in the industry, increase the employment rate of talents, and make greater contribution to the development of the country.展开更多
Background Recently, arsenic trioxide (As 2O 3) was considered as a novel anti tumor agent However, it showed severe toxicity effect on normal tissue at the same time To improve its therapeutic efficacy and de...Background Recently, arsenic trioxide (As 2O 3) was considered as a novel anti tumor agent However, it showed severe toxicity effect on normal tissue at the same time To improve its therapeutic efficacy and decrease its toxicity,we prepared arsenic trioxide loaded albuminutes immuno nanospheres [As 2O 3 (HAS NS) BDI 1] targeted with nonoclonal antibody (McAb) BDI 1 and tested its specific killing effect against bladder cancer cell Methods As 2O 3 HAS NS was prepared by chemical cross linking method Monoclonal antibody BDI 1 was purified with ammonium sulphate saltingout and chromatography Albuminutes microspheres were conjugated with McAb by SPDP cross linking method Concentration of As in As 2O 3 (HAS NS) BDI 1 and As 2O 3 HAS NS was measured by atomic fluometry method As 2O 3 (HAS NS) BDI 1 and its activity were detected by SDS PAGE reduction electrophoresis, indirect immunofluorescence test, light microscope and scanning electron microscope observation Acridine orange staining and tritiated thymidine ( 3H TdR) incorporation tests were used to indicate specific killing activity of As 2O 3 (HAS NS) BDI 1 in vitro Results In As 2O 3 (HAS NS) BDI 1 groups, we saw two protein bands in SDS PAGE reduction electrophoresis Albuminutes immuno nanospheres were rounded with clear green fluorescence by immunofluorescence test Under microscope, we observed that BIU 87 cells were covered with the As 2O 3 (HAS NS) BDI 1 and that As 2O 3 (HAS NS) BDI 1 moved with the BIU 87 cells The albuminutes immuno nanospheres were tightly junctioned with the BIU 87 cells Specific killing activity of As 2O 3 (HAS NS) BDI 1 on bladder tumor cells was observed by acridine orange staining and 3H TdR incorporation assays Conclusions As 2O 3 (HAS NS) BDI 1 might bind specifically against BIU 87 cells, thus leading to high activity of killing bladder tumor cells展开更多
Manipulation of mouse genome has merged as one of the most important approaches for studying genefunction and establishing the disease model because of the high homology between human genome and mouse genome. In this ...Manipulation of mouse genome has merged as one of the most important approaches for studying genefunction and establishing the disease model because of the high homology between human genome and mouse genome. In this study, the chemical mutagen ethylnitrosourea (ENU) was employed for inducing germ cell mutations in maleC57BL/6J mice. The first generation (G1) of the backcrossof these mutated mice, totally 3172, was screened for abnor-mal phenotypes on gross morphology, behavior, learning and memory, auditory brainstem response (ABR), electrocardio-gram (ECG), electroretinogram (ERG), flash-visual evoked potential (F-VEP), bone mineral density, and blood sugarlevel. 595 mice have been identified with specific dominantabnormalities. Fur color changes, eye defects and hearing loss occurred at the highest frequency. Abnormalities related to metabolism alteration are least frequent. Interestingly, eye defects displayed significant left-right asymmetry and sexpreference. Sex preference is also observed in mice with ab-normal bone mineral density. Among 104 G1 generation mutant mice examined for inheritability, 14 of them have been confirmed for passing abnormal phenotypes to their progenies. However, we did not observe behavior abnormali-ties of G1 mice to be inheritable, suggesting multi-gene con-trol for these complicated functions in mice. In conclusion, the generation of these mutants paves the way for under-standing molecular and cellular mechanisms of these ab-normal phenotypes, and accelerates the cloning of disease-related genes.展开更多
Removal of NOx ( DeNOx, NOx is the total of NO and NO2) from flue gas by radical injection has been investigated . The discharge characteristics were examined and the steady streamer corona was acquired by adjusting t...Removal of NOx ( DeNOx, NOx is the total of NO and NO2) from flue gas by radical injection has been investigated . The discharge characteristics were examined and the steady streamer corona was acquired by adjusting the nozzle gases properly. It was found that an increase in the voltage resulted in a decrease in the NO concentration and the concentration of the NO2 increased at low voltages but decreased as the voltage rose to a certain level. The DeNOx efficiency increased as the applied voltage rose and reached a maximum of 70% when the voltage approached the break-down voltage. The hypothetical mechanism of NOx removal suggested that the radicals formed in the discharge process converted the NO and NO2 into acidic species. The Monte Carlo method was used to calculate the rate coefficients and the productivity of the radicals, and then the concentrations of both NO and NO2 and the DeNOx efficiencies were calcu-lated with chemical kinetics. The calculated DeNOx efficien-cies were comparable with the experimental DeNOx efficien-cies at low voltages, but were lower at high voltages.展开更多
基金Project supported by the National Natural Science Foundation of China (Nos. 49831070 and 49973027).
文摘Soil erosion accelerates soil degradation. Some natural soils and cultivated soils on sloping land in southern Jiangsu Province, China were chosen to study soil degradation associated with erosion. Soil erosion intensity was investigated using the 137Cs tracer method. Soil particle-size distribution, soil organic matter (OM), total nitrogen (TN) and total phosphorus (TP) were measured, and the effects of erosion on soil physical and chemical properties were analyzed statistically using SYSTAT8.0. Results indicated that erosion intensity of cultivated soils was greater than that of the natural soils, suggesting that cultivation increased soil loss. Erosion also led to an increase of coarser soil particle proportion, especially in natural soils. In addition, silt was the primary soil particle lost due to erosion. However, in cultivated fields, coarser soil particles over time were attributed not only to soil erosion but also to mechanical eluviation as a result of farming activities. Moreover, erosion caused a decrease in soil OM, TN and TP as well as thinning of the soil layer.
文摘In this paper, removal of NOx(namely DeNOx) from flue gas by radical injection combined with NaOH solution(26% by weight of NaOH in water) scrubbing was investigated. The experimental results showed that the steady streamer corona occurs through adjusting the flow rate of the oxygen fed into the nozzles electrode. The vapor in the oxygen has influence on the V I characteristics of corona discharge. Both HNO 2 and HNO 3 come into being in the plasma reactor and the DeNOx efficiency in the plasma reactor is more than 60%. The overall DeNOx efficiency of the whole system reaches 81 7% when the NaOH solution scrubbing is collaborated.
文摘At present, the higher vocational education system is constantly improving. Mechanical drawing teaching has great influence on the cultivation of professional talents. All aspects of teaching concepts and methods should be innovated and better combined with national talent demand, so as to better optimize the effect of teaching reform and effectively arrange all aspects of education. The reform of mechanical drawing teaching in higher vocational colleges should introduce advanced teaching techniques and concepts, strengthen teachers training, strengthen teachers strength, continuously innovate teaching contents, closely combine with current affairs in the industry, increase the employment rate of talents, and make greater contribution to the development of the country.
基金ThisstudywassupportedbyNationalYouthNatureScienceFoundationofChina (No 3 0 2 0 0 2 84)
文摘Background Recently, arsenic trioxide (As 2O 3) was considered as a novel anti tumor agent However, it showed severe toxicity effect on normal tissue at the same time To improve its therapeutic efficacy and decrease its toxicity,we prepared arsenic trioxide loaded albuminutes immuno nanospheres [As 2O 3 (HAS NS) BDI 1] targeted with nonoclonal antibody (McAb) BDI 1 and tested its specific killing effect against bladder cancer cell Methods As 2O 3 HAS NS was prepared by chemical cross linking method Monoclonal antibody BDI 1 was purified with ammonium sulphate saltingout and chromatography Albuminutes microspheres were conjugated with McAb by SPDP cross linking method Concentration of As in As 2O 3 (HAS NS) BDI 1 and As 2O 3 HAS NS was measured by atomic fluometry method As 2O 3 (HAS NS) BDI 1 and its activity were detected by SDS PAGE reduction electrophoresis, indirect immunofluorescence test, light microscope and scanning electron microscope observation Acridine orange staining and tritiated thymidine ( 3H TdR) incorporation tests were used to indicate specific killing activity of As 2O 3 (HAS NS) BDI 1 in vitro Results In As 2O 3 (HAS NS) BDI 1 groups, we saw two protein bands in SDS PAGE reduction electrophoresis Albuminutes immuno nanospheres were rounded with clear green fluorescence by immunofluorescence test Under microscope, we observed that BIU 87 cells were covered with the As 2O 3 (HAS NS) BDI 1 and that As 2O 3 (HAS NS) BDI 1 moved with the BIU 87 cells The albuminutes immuno nanospheres were tightly junctioned with the BIU 87 cells Specific killing activity of As 2O 3 (HAS NS) BDI 1 on bladder tumor cells was observed by acridine orange staining and 3H TdR incorporation assays Conclusions As 2O 3 (HAS NS) BDI 1 might bind specifically against BIU 87 cells, thus leading to high activity of killing bladder tumor cells
基金supported by the State“863”High-Tech Project and the National Gongguan Project
文摘Manipulation of mouse genome has merged as one of the most important approaches for studying genefunction and establishing the disease model because of the high homology between human genome and mouse genome. In this study, the chemical mutagen ethylnitrosourea (ENU) was employed for inducing germ cell mutations in maleC57BL/6J mice. The first generation (G1) of the backcrossof these mutated mice, totally 3172, was screened for abnor-mal phenotypes on gross morphology, behavior, learning and memory, auditory brainstem response (ABR), electrocardio-gram (ECG), electroretinogram (ERG), flash-visual evoked potential (F-VEP), bone mineral density, and blood sugarlevel. 595 mice have been identified with specific dominantabnormalities. Fur color changes, eye defects and hearing loss occurred at the highest frequency. Abnormalities related to metabolism alteration are least frequent. Interestingly, eye defects displayed significant left-right asymmetry and sexpreference. Sex preference is also observed in mice with ab-normal bone mineral density. Among 104 G1 generation mutant mice examined for inheritability, 14 of them have been confirmed for passing abnormal phenotypes to their progenies. However, we did not observe behavior abnormali-ties of G1 mice to be inheritable, suggesting multi-gene con-trol for these complicated functions in mice. In conclusion, the generation of these mutants paves the way for under-standing molecular and cellular mechanisms of these ab-normal phenotypes, and accelerates the cloning of disease-related genes.
文摘Removal of NOx ( DeNOx, NOx is the total of NO and NO2) from flue gas by radical injection has been investigated . The discharge characteristics were examined and the steady streamer corona was acquired by adjusting the nozzle gases properly. It was found that an increase in the voltage resulted in a decrease in the NO concentration and the concentration of the NO2 increased at low voltages but decreased as the voltage rose to a certain level. The DeNOx efficiency increased as the applied voltage rose and reached a maximum of 70% when the voltage approached the break-down voltage. The hypothetical mechanism of NOx removal suggested that the radicals formed in the discharge process converted the NO and NO2 into acidic species. The Monte Carlo method was used to calculate the rate coefficients and the productivity of the radicals, and then the concentrations of both NO and NO2 and the DeNOx efficiencies were calcu-lated with chemical kinetics. The calculated DeNOx efficien-cies were comparable with the experimental DeNOx efficien-cies at low voltages, but were lower at high voltages.
