Based on the assay of the total content and available content of the trace nutrient elements and the soil pH and organic matter of the soil samples,the characteristic of the available content of the trace nutrient ele...Based on the assay of the total content and available content of the trace nutrient elements and the soil pH and organic matter of the soil samples,the characteristic of the available content of the trace nutrient elements and their affecting factors are studied. The results show that the available B in western Jilin is in a middle level,the content in Nong'an is higher than that in the others; the available Mn is extremely abundant; the available Cu in Nong'an is obviously higher than other areas,and the content in Da'an differs greatly; the available Zn is in a middle level; the severe shortage of available Mo differs between different areas; and the available Fe is extremely abundant. The available Mn,Cu and Fe have significantly positive correlation with their total content; the available B has significantly positive correlation with pH,and Zn has obviously negative correlation with pH; the available Mn and Fe had significantly positive correlation with soil organic matter.展开更多
Aiming at the shortage of sufficient continuous parameters for using models to estimate farmland soil organic carbon(SOC) content, an acquisition method of factors influencing farmland SOC and an estimation method of ...Aiming at the shortage of sufficient continuous parameters for using models to estimate farmland soil organic carbon(SOC) content, an acquisition method of factors influencing farmland SOC and an estimation method of farmland SOC content with Internet of Things(IOT) are proposed in this paper. The IOT sensing device and transmission network were established in a wheat demonstration base in Yanzhou Distict of Jining City, Shandong Province, China to acquire data in real time. Using real-time data and statistics data, the dynamic changes of SOC content between October 2012 and June 2015 was simulated in the experimental area with SOC dynamic simulation model. In order to verify the estimation results, potassium dichromate external heating method was applied for measuring the SOC content. The results show that: 1) The estimated value matches the measured value in the lab very well. So the method is feasible in this paper. 2) There is a clear dynamic variation in the SOC content at 0.2 m soil depth in different growing periods of wheat. The content reached the highest level during the sowing period, and is lowest in the flowering period. 3) The SOC content at 0.2 m soil depth varies in accordance with the amount of returned straw. The larger the amount of returned straw is, the higher the SOC content.展开更多
Transcription factors（TFs）play critical roles in the development of the nervous system,but the transcriptional regulatory mechanisms of these genes are poorly understood.Here we analyzed 5-kb of the 5＇ flanking gen...Transcription factors（TFs）play critical roles in the development of the nervous system,but the transcriptional regulatory mechanisms of these genes are poorly understood.Here we analyzed 5-kb of the 5＇ flanking genomic DNA sequences of 41 TF genes involved in neuronal development.The results showed that the TF genes tend to have higher GC contents in the proximal region and most of the TF genes have at least one proximal GC-rich（GC content60%）promoter with a CpG island.The promoter distribution analysis showed that the GC-poor promoters were sporadically distributed within the 5-kb flanking genomic sequence（FGS）;however,more than half（37 of 70）of the GC-rich promoters were located in the proximal region between nucleotides—1 and—500.Luciferase assays showed that partial GC-rich promoters increased gene expression in SH-SY5Y cells and that CpG methylation repressed the promoter activity.This study suggests a potential general mechanism for regulation of TF expression.展开更多
The surface vapor content has a close correlation with the generation of precipitation. Based on the atmospheric circulation data and surface vapor content data from 37 weather stations across the Tarim Basin dur- ing...The surface vapor content has a close correlation with the generation of precipitation. Based on the atmospheric circulation data and surface vapor content data from 37 weather stations across the Tarim Basin dur- ing 1961-2010, the paper analyzed the vapor variation trend, period, abrupt changes and their causes. The results show that the increase trend of surface vapor content over the Tarim Basin mostly conforms with the average trend coefficient of 0.48. There were 3 centers displaying a trend of high vapor increase and 3 centers displaying a low vapor increase. These centers were distributed in strips and blocks across the basin from northeast to southwest. Notable inter-decadal variations in annual and seasonal vapor contents occurred in the Tarim Basin during the 50 years of the study period, with more vapor after the mid-1980s and less vapor in the 1960s and the 1970s. The significant increase in vapor content in the 50 year period occurred mostly in the 1980s and the 1990s. The in- creasing trend across the four seasons was strongest in summer, reaching 0.43, and weakest in spring. Great variations existed between the spring trend and the annual, summer, autumn and winter trends. During the 50-year study period, there are distinguishable periods of 4-6 years and 8-10 years in which the annual and seasonal vapor contents varied alternately between low and high concentrations. The annual vapor content and that of the four individual seasons all changed abruptly in about the mid-1980s （a〈0.05）. The west wind circulation, Tibetan Plateau circulation and the annual mean temperatures of the Tarim Basin are the main factors that influenced the surface vapor content over the study area, of which the Tibetan Plateau circulation may be the most important one.展开更多
The Lattice Gas Automation （LGA） method, which is improved by introducing a reflection coefficient for the border between phases to show its effect on current path, is used in this paper to simulate the current flow...The Lattice Gas Automation （LGA） method, which is improved by introducing a reflection coefficient for the border between phases to show its effect on current path, is used in this paper to simulate the current flow in digital rock for investigating the effects of clay content and clay distribution types on the relationship between formation factor（F） and rock porosity（φ）. The digital rock model is constructed by simulating a natural deposit of matrix particles with different shapes and radius. Based on the simulation results, it was found that both dispersed clay and laminated clay can lead to a non-Archie relationship of F-φ. The non-Archie effect of laminated clay on the F-φ relationship was more significant than that of dispersed clay. Moreover, a realistic model is developed in this work for quantitatively describing the effect of clay content （Denoted as Vsh） on parameters a and m. These study results have further demonstrated the validity of LGA in study of electrical transport properties at a pore scale.展开更多
基于一测多评法建立同时测定栀子、山茱萸、胡黄连、玄参4种药材中莫诺苷、栀子苷、马钱苷、胡黄连苷Ⅱ、胡黄连苷Ⅰ和哈巴俄苷6个环烯醚萜苷类成分的含量测定方法。采用超高效液相色谱-四极杆/静电场轨道阱高分辨质谱(UPLC-Q-Exactive ...基于一测多评法建立同时测定栀子、山茱萸、胡黄连、玄参4种药材中莫诺苷、栀子苷、马钱苷、胡黄连苷Ⅱ、胡黄连苷Ⅰ和哈巴俄苷6个环烯醚萜苷类成分的含量测定方法。采用超高效液相色谱-四极杆/静电场轨道阱高分辨质谱(UPLC-Q-Exactive Orbitrap-MS)技术确定栀子等4种药材中各环烯醚萜苷类成分的专属性;采用高效液相色谱(HPLC)法,以栀子苷为内参照物,采用多点校正法,计算得莫诺苷、马钱苷、胡黄连苷Ⅱ、胡黄连苷Ⅰ、哈巴俄苷5个待测组分的相对校正因子,建立一测多评(quantitative analysis of multi-components by single-marker,QAMS)含量测定方法,并与外标法(external standard method,ESM)实测值进行比较。通过多点校正法计算得到莫诺苷、马钱苷、胡黄连苷Ⅱ、胡黄连苷Ⅰ、哈巴俄苷的相对校正因子分别为0.8948、1.0968、1.2849、1.7008、1.4051,QAMS与ESM测定值无显著差异,相对标准偏差小于1.0%。基于一测多评法建立了一种同时测定栀子中栀子苷、山茱萸中莫诺苷和马钱苷、胡黄连中胡黄连苷Ⅱ和胡黄连苷Ⅰ以及玄参中哈巴俄苷6个环烯醚萜苷类成分的含量测定方法,该方法准确、可行,可用于栀子、山茱萸、胡黄连、玄参药材的质量评价,并为其他药材质量评价提供参考。展开更多
Comprehensive quantitative evaluation of shale gas content and the controlling factors in different occurrence states is of great significance for accurately assessing gas-bearing capacity and providing effective well...Comprehensive quantitative evaluation of shale gas content and the controlling factors in different occurrence states is of great significance for accurately assessing gas-bearing capacity and providing effective well-production strategies. A total of 122 core samples from well JY-A in the Fuling shale gas field were studied to reveal the characteristics of S_1 l shale,15 of which were selected to further predict the shale gas content in different occurrence states, which are dependent on geological factors in the thermal evolution process. Geological parameters were researched by a number of laboratory programs, and the factors influential in controlling shale gas content were extracted by both PCA and GRA methods and prediction models were confirmed by the BE method using SPSS software. Results reveal that the adsorbed gas content is mainly controlled by TOC, Ro, SSA, PD and pyrite content, and the free gas content is mainly controlled by S_2, quartz content, gas saturation and formation pressure for S_1 l in well JY-A. Three methods, including the on-site gas desorption method, the empirical formula method, and the multiple regression analysis method were used in combination to evaluate the shale gas capacity of well JY-A, all of which show that the overall shale gas content of well JY-A is in the range of 2.0–5.0 m^3/t and that the free gas ratio is about 50%, lower than that of well JY-1. Cause analysis further confirms the tectonics and preservation conditions of S_1 l in the geological processes, especially the influence of eastern boundary faults on well JY-A, as the fundamental reasons for the differences in shale gas enrichment in the Jiaoshiba area.展开更多
基金Supported by a Sub-project "Ecological Geochemical Survey of Oil Crop (sunflower) Producing Area in Western Jilin" of the Project of China Geological Survey and Jilin Provincial Government " Agricul-tural Geological Survey of Jilin Province"~~
文摘Based on the assay of the total content and available content of the trace nutrient elements and the soil pH and organic matter of the soil samples,the characteristic of the available content of the trace nutrient elements and their affecting factors are studied. The results show that the available B in western Jilin is in a middle level,the content in Nong'an is higher than that in the others; the available Mn is extremely abundant; the available Cu in Nong'an is obviously higher than other areas,and the content in Da'an differs greatly; the available Zn is in a middle level; the severe shortage of available Mo differs between different areas; and the available Fe is extremely abundant. The available Mn,Cu and Fe have significantly positive correlation with their total content; the available B has significantly positive correlation with pH,and Zn has obviously negative correlation with pH; the available Mn and Fe had significantly positive correlation with soil organic matter.
基金Under the auspices of National High-tech R&D Program of China(No.2013AA102301)National Natural Science Foundation of China(No.71503148)
文摘Aiming at the shortage of sufficient continuous parameters for using models to estimate farmland soil organic carbon(SOC) content, an acquisition method of factors influencing farmland SOC and an estimation method of farmland SOC content with Internet of Things(IOT) are proposed in this paper. The IOT sensing device and transmission network were established in a wheat demonstration base in Yanzhou Distict of Jining City, Shandong Province, China to acquire data in real time. Using real-time data and statistics data, the dynamic changes of SOC content between October 2012 and June 2015 was simulated in the experimental area with SOC dynamic simulation model. In order to verify the estimation results, potassium dichromate external heating method was applied for measuring the SOC content. The results show that: 1) The estimated value matches the measured value in the lab very well. So the method is feasible in this paper. 2) There is a clear dynamic variation in the SOC content at 0.2 m soil depth in different growing periods of wheat. The content reached the highest level during the sowing period, and is lowest in the flowering period. 3) The SOC content at 0.2 m soil depth varies in accordance with the amount of returned straw. The larger the amount of returned straw is, the higher the SOC content.
基金supported by the National Natural Science Foundation of China (Nos. 31070928, 30600198, 30870876 and 81000558)the Guangzhou Scholar Project (Nos. 10A011G and 10A012G)the Scientific Research of Guangzhou Municipal Colleges and Universities (No. 10A211).
文摘Transcription factors（TFs）play critical roles in the development of the nervous system,but the transcriptional regulatory mechanisms of these genes are poorly understood.Here we analyzed 5-kb of the 5＇ flanking genomic DNA sequences of 41 TF genes involved in neuronal development.The results showed that the TF genes tend to have higher GC contents in the proximal region and most of the TF genes have at least one proximal GC-rich（GC content60%）promoter with a CpG island.The promoter distribution analysis showed that the GC-poor promoters were sporadically distributed within the 5-kb flanking genomic sequence（FGS）;however,more than half（37 of 70）of the GC-rich promoters were located in the proximal region between nucleotides—1 and—500.Luciferase assays showed that partial GC-rich promoters increased gene expression in SH-SY5Y cells and that CpG methylation repressed the promoter activity.This study suggests a potential general mechanism for regulation of TF expression.
基金supported by the National Natural Science Foundation of China (40975097)National Basic Research Program of China (2010CB951001)the Special Fund for Public Welfare Industry (Meteorology) (GYHY201006012)
文摘The surface vapor content has a close correlation with the generation of precipitation. Based on the atmospheric circulation data and surface vapor content data from 37 weather stations across the Tarim Basin dur- ing 1961-2010, the paper analyzed the vapor variation trend, period, abrupt changes and their causes. The results show that the increase trend of surface vapor content over the Tarim Basin mostly conforms with the average trend coefficient of 0.48. There were 3 centers displaying a trend of high vapor increase and 3 centers displaying a low vapor increase. These centers were distributed in strips and blocks across the basin from northeast to southwest. Notable inter-decadal variations in annual and seasonal vapor contents occurred in the Tarim Basin during the 50 years of the study period, with more vapor after the mid-1980s and less vapor in the 1960s and the 1970s. The significant increase in vapor content in the 50 year period occurred mostly in the 1980s and the 1990s. The in- creasing trend across the four seasons was strongest in summer, reaching 0.43, and weakest in spring. Great variations existed between the spring trend and the annual, summer, autumn and winter trends. During the 50-year study period, there are distinguishable periods of 4-6 years and 8-10 years in which the annual and seasonal vapor contents varied alternately between low and high concentrations. The annual vapor content and that of the four individual seasons all changed abruptly in about the mid-1980s （a〈0.05）. The west wind circulation, Tibetan Plateau circulation and the annual mean temperatures of the Tarim Basin are the main factors that influenced the surface vapor content over the study area, of which the Tibetan Plateau circulation may be the most important one.
基金supported by the National Natural Science Foundation of China(projects No.41074103 and 50404001)the National Key Fundamental R & D Project(Grant No.2007CB209601)
文摘The Lattice Gas Automation （LGA） method, which is improved by introducing a reflection coefficient for the border between phases to show its effect on current path, is used in this paper to simulate the current flow in digital rock for investigating the effects of clay content and clay distribution types on the relationship between formation factor（F） and rock porosity（φ）. The digital rock model is constructed by simulating a natural deposit of matrix particles with different shapes and radius. Based on the simulation results, it was found that both dispersed clay and laminated clay can lead to a non-Archie relationship of F-φ. The non-Archie effect of laminated clay on the F-φ relationship was more significant than that of dispersed clay. Moreover, a realistic model is developed in this work for quantitatively describing the effect of clay content （Denoted as Vsh） on parameters a and m. These study results have further demonstrated the validity of LGA in study of electrical transport properties at a pore scale.
文摘基于一测多评法建立同时测定栀子、山茱萸、胡黄连、玄参4种药材中莫诺苷、栀子苷、马钱苷、胡黄连苷Ⅱ、胡黄连苷Ⅰ和哈巴俄苷6个环烯醚萜苷类成分的含量测定方法。采用超高效液相色谱-四极杆/静电场轨道阱高分辨质谱(UPLC-Q-Exactive Orbitrap-MS)技术确定栀子等4种药材中各环烯醚萜苷类成分的专属性;采用高效液相色谱(HPLC)法,以栀子苷为内参照物,采用多点校正法,计算得莫诺苷、马钱苷、胡黄连苷Ⅱ、胡黄连苷Ⅰ、哈巴俄苷5个待测组分的相对校正因子,建立一测多评(quantitative analysis of multi-components by single-marker,QAMS)含量测定方法,并与外标法(external standard method,ESM)实测值进行比较。通过多点校正法计算得到莫诺苷、马钱苷、胡黄连苷Ⅱ、胡黄连苷Ⅰ、哈巴俄苷的相对校正因子分别为0.8948、1.0968、1.2849、1.7008、1.4051,QAMS与ESM测定值无显著差异,相对标准偏差小于1.0%。基于一测多评法建立了一种同时测定栀子中栀子苷、山茱萸中莫诺苷和马钱苷、胡黄连中胡黄连苷Ⅱ和胡黄连苷Ⅰ以及玄参中哈巴俄苷6个环烯醚萜苷类成分的含量测定方法,该方法准确、可行,可用于栀子、山茱萸、胡黄连、玄参药材的质量评价,并为其他药材质量评价提供参考。
基金financially supported by the Natural Science Foundation of China (NSFC Grant 41572106)+1 种基金the National Science and Technology Major Project "The enrichment conditions, evaluation technology and application of shale gas in the Sichuan Basin and its periphery" (Item No. 2017ZX05035002-006)State Key Laboratory of oil and gas resources and exploration, Chinese University of Petroleum-Beijing
文摘Comprehensive quantitative evaluation of shale gas content and the controlling factors in different occurrence states is of great significance for accurately assessing gas-bearing capacity and providing effective well-production strategies. A total of 122 core samples from well JY-A in the Fuling shale gas field were studied to reveal the characteristics of S_1 l shale,15 of which were selected to further predict the shale gas content in different occurrence states, which are dependent on geological factors in the thermal evolution process. Geological parameters were researched by a number of laboratory programs, and the factors influential in controlling shale gas content were extracted by both PCA and GRA methods and prediction models were confirmed by the BE method using SPSS software. Results reveal that the adsorbed gas content is mainly controlled by TOC, Ro, SSA, PD and pyrite content, and the free gas content is mainly controlled by S_2, quartz content, gas saturation and formation pressure for S_1 l in well JY-A. Three methods, including the on-site gas desorption method, the empirical formula method, and the multiple regression analysis method were used in combination to evaluate the shale gas capacity of well JY-A, all of which show that the overall shale gas content of well JY-A is in the range of 2.0–5.0 m^3/t and that the free gas ratio is about 50%, lower than that of well JY-1. Cause analysis further confirms the tectonics and preservation conditions of S_1 l in the geological processes, especially the influence of eastern boundary faults on well JY-A, as the fundamental reasons for the differences in shale gas enrichment in the Jiaoshiba area.
