The formation of Stagnic Anthrosols is closely related to rice planting and parent materials. Six representative pedons, two from each of three Stagnic Anthrosol subgroups, Vertic Haplic-, Vertic Gleyic-, and Sulfic G...The formation of Stagnic Anthrosols is closely related to rice planting and parent materials. Six representative pedons, two from each of three Stagnic Anthrosol subgroups, Vertic Haplic-, Vertic Gleyic-, and Sulfic Gleyic-Stagnic Anthrosols, from different parent materials and soil formation processes, from Liaoning Province, China, were selected and used along with additional supporting data to assess the potential impact in each soil subgroup combination of both pedogenic and anthropogenic factors on the migration and geochemical characteristics of calcium (Ca) and magnesium (Mg) and their relations to soil particle-size composition. Results revealed that exchangeable Mg was correlated positively with clay and silt content, but negatively with sand content, suggesting that clay and silt could retain more exchangeable Mg than sand. Also, in the six pedons exchangeable Ca/Mg ratios generally decreased with depth, which was most likely due to the preferential retention of Mg below the Apl horizon and the effects of bio-cycling in rice-soil systems. The pedons with high pH had smaller exchangeable Ca/Mg ratios than those with low pH. Thus, it was concluded that exchangeable Ca/Mg ratios could be helpful in classification of Stagnic Anthrosols.展开更多
The vertical distribution of the dominant genera of plant nematodes at the depth of 0–150 cm of an aquic brown soil were studied for four land use patterns, i.e., paddy field, maize field, fallow field and woodland i...The vertical distribution of the dominant genera of plant nematodes at the depth of 0–150 cm of an aquic brown soil were studied for four land use patterns, i.e., paddy field, maize field, fallow field and woodland in the Shenyang Experimental Station of Ecology, Chi- nese Academy of Sciences in November of 2003. The results showed that the numbers of some dominant genera under different land uses decreased with the increase of soil depth. Helicotylenchus was most dominant genus under each land use type. Genera of Filenchus, Psilen- chus and Tylenchus in paddy field occurred at the depth of 0–20 cm; while Paratylenchus in fallow field and woodland, as well as Praty- lenchus in maize field presented in the deeper soil layers (0–80 cm). Significant correlations between the numbers of dominant genera of plant nematodes and soil chemical properties were found in this study. The number of Helicotylenchus under different land uses was posi- tively correlated with C/N ratio, total C, total N, total P, alkai-N, and Olsen-P. The numbers of Filenchus and Paratylenchus in paddy field, Pratylenchus in maize field and Paratylenchus in fallow field were negatively correlated with soil pH, and positively correlated with total C, total N and alkai-N. This study results showed that it is essential to sample at a certain depth according to the vertical distribution informa- tion of different genera of plant nematodes in adequately assessing the population size of plant nematodes.展开更多
At a rice wheat rotational free air CO 2 enrichment(FACE) platform, the effect of elevated atmospheric CO 2 on soil nematode communities in a farmland ecosystem was studied. Wheat plots were exposed to elevated atmosp...At a rice wheat rotational free air CO 2 enrichment(FACE) platform, the effect of elevated atmospheric CO 2 on soil nematode communities in a farmland ecosystem was studied. Wheat plots were exposed to elevated atmospheric CO 2(ambient 370 μl/L + 200 μl/L). 32 families and 40 genera of nematode were observed in soil suspensions during the study period. Under FACE treatment, the numbers of total nematodes, bacterivores and fungivores exhibited an increasing trend. Because of the seasonal variation of soil temperature and moisture, the effect of elevated atmospheric CO 2 on soil nematodes was only observed under favorable conditions. The response of nematode communities to elevated atmospheric CO 2 may indicate the change of soil food web.展开更多
A novel spatial domain method--soft morphology filter is presented for reducing the periodic noise in image processing. The simulation results are presented to demonstrate the effectiveness of the method in comparison...A novel spatial domain method--soft morphology filter is presented for reducing the periodic noise in image processing. The simulation results are presented to demonstrate the effectiveness of the method in comparison with a frequency domain method and other spatial domain filters.展开更多
This paper is to construct a “digital local, regional, region” information framework based on the technology of “SIG” and its significance and application to the regional sustainable development evaluation system....This paper is to construct a “digital local, regional, region” information framework based on the technology of “SIG” and its significance and application to the regional sustainable development evaluation system. First, the concept of the “grid computing” and “SIG” is interpreted and discussed, then the relationship between the “grid computing” and “digital region” is analyzed, and the framework of the “digital region” is put forward. Finally, the significance and application of “grid computing” to the “region sustainable development evaluation system” are discussed.展开更多
Objective: To study the effects of allogeneic blood transfusion on polarized Th cell in gastric carcinoma patients during perioperative time. Methods: Thirty patients undergoing gastric carcinectomy were randomly divi...Objective: To study the effects of allogeneic blood transfusion on polarized Th cell in gastric carcinoma patients during perioperative time. Methods: Thirty patients undergoing gastric carcinectomy were randomly divided into three groups with 10 patients in each group: group A received no allogeneic blood; group B received leukodepleted blood; group C received allogeneic whole blood during perioperative time. The polarized rates of Th cell were measured by flow cytometry. Results: The counts of Thl in group A decreased significantly on the 2nd postoperation, but returned to the baseline levels on the 5th postoperative day. The Thl counts and Th1/Th2 ratio decreased significantly in group B and group C after blood transfusion (P<0.05). The Th2 counts increased significantly in group B and C postoperative time. On the 10th postoperative day the Th1 ,Th2 cell counts and Th1/Th2 ratio returned to preoperative level in group B, but remained low in group C. As compared with that in group A, the Th1 cell counts, Th1/Th2 ratio reduced and Th2 cell counts increased markedly in group C than in group B(P<0.05). Conclusion: Perioperative blood transfusion contributes to the immunosuppression, which is more serious after whole blood transfusion than leukodepleted blood. In perioperative period component blood transfusion is superior to whole blood transfusion. The Th cells polarized to Th2 cells may be one of the causes of immunosuppression in patients received allogeneic blood transfusion.展开更多
sST2 is one of the members of interleukin-1 receptor family. When the myocardium is excessively pulled, sST2 and ST2L competitively bind IL-33, reducing the IL-33/ST2L signal pathway, which leads to accelerated myocar...sST2 is one of the members of interleukin-1 receptor family. When the myocardium is excessively pulled, sST2 and ST2L competitively bind IL-33, reducing the IL-33/ST2L signal pathway, which leads to accelerated myocardial remodeling and ventricular dysfunction. Unlike natriuretic peptide, sST2 is almost unaffected by age, gender, race, BMI, etiology of heart failure, atrial fibrillation, anemia, kidney function and other factors. At present, sST2 has played an important role in the diagnosis, prognosis and risk stratification of heart failure. With the deepening of clinical research, the application value of sST2 in other cardiovascular diseases needs further discussion. In addition, patients with metabolic syndrome and other diseases that affect myocardial metabolism and myocardial remodeling can consider to further assess the severity of the disease by measuring the concentration of sST2 and dynamically monitoring it.展开更多
According to the rainfall data of five national meteorological observation stations in Nanchang from 1990-2019 (including 1990-1998), using statistical method, linear trend and correlation analysis, the rainstorm char...According to the rainfall data of five national meteorological observation stations in Nanchang from 1990-2019 (including 1990-1998), using statistical method, linear trend and correlation analysis, the rainstorm characteristics and trends in Nanchang in 30 years are studied, and the results show that the average annual rainfall in Nanchang gradually decreases by 1.5932 / a;the rainfall in extreme annual rainfall is concentrated, and the southeast rainfall is more than that in the northwest. The average annual rainstorm day in the city is 5.8 days, and the number of rainstorms in each station is obvious, and the frequency of rainstorms in spring and summer is the highest. The average number of annual torrential rains in the city gradually decreased with a trend of 0.0167 / a. The average monthly rainfall was highly correlated with the average number of monthly heavy rains. The beginning and end time span of the rainstorm is relatively large. Rainstorm days are mostly discontinuous and the probability of continuous rainstorm is low. Especially the probability of 3 consecutive days is lower, and there is no rainstorm weather for 4 consecutive days. Rainfall was positively correlated with the number of rainstorms. The year of extreme annual rainfall in each station is concentrated;the annual rainfall is quite different. Overall, the rainfall in the southeast is more than the northwest. Therefore, we make a detailed analysis of the data cycle and time of the rainfall trend in Nanchang in order to make professional contribution to the improvement of the value of meteorological service and provide meteorological analysis suggestions for better production and life.展开更多
The chemistry of inclusion compounds has a long history and is nowadays a subject of wide-ranging and intense study. With the awarding of the 1987 Nobel Prize in Chemistry to Donald J. Cram, Jean-Marie Lehn and Charle...The chemistry of inclusion compounds has a long history and is nowadays a subject of wide-ranging and intense study. With the awarding of the 1987 Nobel Prize in Chemistry to Donald J. Cram, Jean-Marie Lehn and Charles J. Pedersen for their fundamental work on 'host-vip' or 'supramolecular' systems, inclusion chemistry has come to the fore front in contemporary researches. Increasing varieties of novel inclusion compounds and new host molecules have been synthesized recently. The term 'crystal engineering' was coined by Schmidt to describe the rational design and control of molecular packing arrangements in the solid state, and the structural study of clathrates has contributed展开更多
基金1 Project supported by the Knowledge Innovation Program of Chinese Academy of Sciences (No. KZCX2-413-9) and theNational High Technology Research and Development Program of China (No. 2004AA246020).
文摘The formation of Stagnic Anthrosols is closely related to rice planting and parent materials. Six representative pedons, two from each of three Stagnic Anthrosol subgroups, Vertic Haplic-, Vertic Gleyic-, and Sulfic Gleyic-Stagnic Anthrosols, from different parent materials and soil formation processes, from Liaoning Province, China, were selected and used along with additional supporting data to assess the potential impact in each soil subgroup combination of both pedogenic and anthropogenic factors on the migration and geochemical characteristics of calcium (Ca) and magnesium (Mg) and their relations to soil particle-size composition. Results revealed that exchangeable Mg was correlated positively with clay and silt content, but negatively with sand content, suggesting that clay and silt could retain more exchangeable Mg than sand. Also, in the six pedons exchangeable Ca/Mg ratios generally decreased with depth, which was most likely due to the preferential retention of Mg below the Apl horizon and the effects of bio-cycling in rice-soil systems. The pedons with high pH had smaller exchangeable Ca/Mg ratios than those with low pH. Thus, it was concluded that exchangeable Ca/Mg ratios could be helpful in classification of Stagnic Anthrosols.
文摘The vertical distribution of the dominant genera of plant nematodes at the depth of 0–150 cm of an aquic brown soil were studied for four land use patterns, i.e., paddy field, maize field, fallow field and woodland in the Shenyang Experimental Station of Ecology, Chi- nese Academy of Sciences in November of 2003. The results showed that the numbers of some dominant genera under different land uses decreased with the increase of soil depth. Helicotylenchus was most dominant genus under each land use type. Genera of Filenchus, Psilen- chus and Tylenchus in paddy field occurred at the depth of 0–20 cm; while Paratylenchus in fallow field and woodland, as well as Praty- lenchus in maize field presented in the deeper soil layers (0–80 cm). Significant correlations between the numbers of dominant genera of plant nematodes and soil chemical properties were found in this study. The number of Helicotylenchus under different land uses was posi- tively correlated with C/N ratio, total C, total N, total P, alkai-N, and Olsen-P. The numbers of Filenchus and Paratylenchus in paddy field, Pratylenchus in maize field and Paratylenchus in fallow field were negatively correlated with soil pH, and positively correlated with total C, total N and alkai-N. This study results showed that it is essential to sample at a certain depth according to the vertical distribution informa- tion of different genera of plant nematodes in adequately assessing the population size of plant nematodes.
文摘At a rice wheat rotational free air CO 2 enrichment(FACE) platform, the effect of elevated atmospheric CO 2 on soil nematode communities in a farmland ecosystem was studied. Wheat plots were exposed to elevated atmospheric CO 2(ambient 370 μl/L + 200 μl/L). 32 families and 40 genera of nematode were observed in soil suspensions during the study period. Under FACE treatment, the numbers of total nematodes, bacterivores and fungivores exhibited an increasing trend. Because of the seasonal variation of soil temperature and moisture, the effect of elevated atmospheric CO 2 on soil nematodes was only observed under favorable conditions. The response of nematode communities to elevated atmospheric CO 2 may indicate the change of soil food web.
基金Supported by the National Natural Science Foundation of China (No.60373084)
文摘A novel spatial domain method--soft morphology filter is presented for reducing the periodic noise in image processing. The simulation results are presented to demonstrate the effectiveness of the method in comparison with a frequency domain method and other spatial domain filters.
文摘This paper is to construct a “digital local, regional, region” information framework based on the technology of “SIG” and its significance and application to the regional sustainable development evaluation system. First, the concept of the “grid computing” and “SIG” is interpreted and discussed, then the relationship between the “grid computing” and “digital region” is analyzed, and the framework of the “digital region” is put forward. Finally, the significance and application of “grid computing” to the “region sustainable development evaluation system” are discussed.
文摘Objective: To study the effects of allogeneic blood transfusion on polarized Th cell in gastric carcinoma patients during perioperative time. Methods: Thirty patients undergoing gastric carcinectomy were randomly divided into three groups with 10 patients in each group: group A received no allogeneic blood; group B received leukodepleted blood; group C received allogeneic whole blood during perioperative time. The polarized rates of Th cell were measured by flow cytometry. Results: The counts of Thl in group A decreased significantly on the 2nd postoperation, but returned to the baseline levels on the 5th postoperative day. The Thl counts and Th1/Th2 ratio decreased significantly in group B and group C after blood transfusion (P<0.05). The Th2 counts increased significantly in group B and C postoperative time. On the 10th postoperative day the Th1 ,Th2 cell counts and Th1/Th2 ratio returned to preoperative level in group B, but remained low in group C. As compared with that in group A, the Th1 cell counts, Th1/Th2 ratio reduced and Th2 cell counts increased markedly in group C than in group B(P<0.05). Conclusion: Perioperative blood transfusion contributes to the immunosuppression, which is more serious after whole blood transfusion than leukodepleted blood. In perioperative period component blood transfusion is superior to whole blood transfusion. The Th cells polarized to Th2 cells may be one of the causes of immunosuppression in patients received allogeneic blood transfusion.
文摘sST2 is one of the members of interleukin-1 receptor family. When the myocardium is excessively pulled, sST2 and ST2L competitively bind IL-33, reducing the IL-33/ST2L signal pathway, which leads to accelerated myocardial remodeling and ventricular dysfunction. Unlike natriuretic peptide, sST2 is almost unaffected by age, gender, race, BMI, etiology of heart failure, atrial fibrillation, anemia, kidney function and other factors. At present, sST2 has played an important role in the diagnosis, prognosis and risk stratification of heart failure. With the deepening of clinical research, the application value of sST2 in other cardiovascular diseases needs further discussion. In addition, patients with metabolic syndrome and other diseases that affect myocardial metabolism and myocardial remodeling can consider to further assess the severity of the disease by measuring the concentration of sST2 and dynamically monitoring it.
文摘According to the rainfall data of five national meteorological observation stations in Nanchang from 1990-2019 (including 1990-1998), using statistical method, linear trend and correlation analysis, the rainstorm characteristics and trends in Nanchang in 30 years are studied, and the results show that the average annual rainfall in Nanchang gradually decreases by 1.5932 / a;the rainfall in extreme annual rainfall is concentrated, and the southeast rainfall is more than that in the northwest. The average annual rainstorm day in the city is 5.8 days, and the number of rainstorms in each station is obvious, and the frequency of rainstorms in spring and summer is the highest. The average number of annual torrential rains in the city gradually decreased with a trend of 0.0167 / a. The average monthly rainfall was highly correlated with the average number of monthly heavy rains. The beginning and end time span of the rainstorm is relatively large. Rainstorm days are mostly discontinuous and the probability of continuous rainstorm is low. Especially the probability of 3 consecutive days is lower, and there is no rainstorm weather for 4 consecutive days. Rainfall was positively correlated with the number of rainstorms. The year of extreme annual rainfall in each station is concentrated;the annual rainfall is quite different. Overall, the rainfall in the southeast is more than the northwest. Therefore, we make a detailed analysis of the data cycle and time of the rainfall trend in Nanchang in order to make professional contribution to the improvement of the value of meteorological service and provide meteorological analysis suggestions for better production and life.
基金This work was supported by the National Natural Science Foundation of China (Grant No. 29973005) and we are grateful to Hong Kong Research Grants Council Earmarked Grant (CUHK 456/95P) for supporting this research work.
文摘The chemistry of inclusion compounds has a long history and is nowadays a subject of wide-ranging and intense study. With the awarding of the 1987 Nobel Prize in Chemistry to Donald J. Cram, Jean-Marie Lehn and Charles J. Pedersen for their fundamental work on 'host-vip' or 'supramolecular' systems, inclusion chemistry has come to the fore front in contemporary researches. Increasing varieties of novel inclusion compounds and new host molecules have been synthesized recently. The term 'crystal engineering' was coined by Schmidt to describe the rational design and control of molecular packing arrangements in the solid state, and the structural study of clathrates has contributed
