Gas extraction practice has been proven for the clear majority of coal mines in China to be unfavorable using drill holes in the coal seam. Rather, mining-induced fractures in the goaf should be utilized for gas extra...Gas extraction practice has been proven for the clear majority of coal mines in China to be unfavorable using drill holes in the coal seam. Rather, mining-induced fractures in the goaf should be utilized for gas extraction. To study gas migration in mining-induced fractures, one mining face of 10 th Mine in Pingdingshan Coalmine Group in Henan, China, has been selected as the case study for this work. By establishing the mathematical model of gas migration under the influence of coal seam mining, discrete element software UDEC and Multiphysics software COMSOL are employed to model gas migration in mining-induced fractures above the goaf. The results show that as the working face advances, the goaf overburden gradually forms a mining-induced fracture network in the shape of a trapezoid, the size of which increases with the distance of coal face advance. Compared with gas migration in the overburden matrix, the gas flow in the fracture network due to mining is far greater. The largest mining-induced fracture is located at the upper end of the trapezoidal zone, which results in the largest gas flux in the network. When drilling for gas extraction in a mining-induced fracture field, the gas concentration is reduced in the whole region during the process of gas drainage, and the rate of gas concentration drops faster in the fractured zone. It is shown that with gas drainage, the gas flow velocity in the mininginduced fracture network is faster.展开更多
Hexafluoroisopropanol(HFIP)-induced sodium dodecyl sulfate/dodecyltrimethylammonium bromide(SDS/DTAB) catanionic surfactant coacervate extraction method coupled with high performance liquid chromatography(HPLC) was us...Hexafluoroisopropanol(HFIP)-induced sodium dodecyl sulfate/dodecyltrimethylammonium bromide(SDS/DTAB) catanionic surfactant coacervate extraction method coupled with high performance liquid chromatography(HPLC) was used to detect the migration of phthalates from disposable tablewares to drinking water. The concentration factors are larger than 82 and extraction recoveries over 53% for water samples spiked with 100 or 200 ng/m L phthalates. Limit of detection is in the range of 1.0–2.6 ng/m L.Good linearity with correlation coefficients larger than 0.9985 is obtained in the concentration of20–1500 or 40–3000 ng/m L. Relative recoveries are from 82.4% to 123.6% for water samples spiked with30/60, 250/500, and 1500/3000 ng/m L phthalates, respectively. Relative standard deviations(RSDs) are0.4%–7.4% for intraday precision(n = 5) and 0.6%–7.8% for interday precision(n = 3). Four of studied phthalates are found in the drinking water samples prepared from four kinds of tablewares.展开更多
Mechanisms on cancer cell migration and invasion have been major topics of cancer research and anti-cancer therapy development. Among the multiple cell signaling pathways involved in cell migration, those elicited by ...Mechanisms on cancer cell migration and invasion have been major topics of cancer research and anti-cancer therapy development. Among the multiple cell signaling pathways involved in cell migration, those elicited by transforming growth factorβ（TGF-β） have attracted tremendous attention. The TGF-βpolypeptide cytokines include four isoforms：TGF-β1, TGF-β2, TGF-β3, and TGF-β4, which are secreted mainly from cells of white blood cell lineage, such as macrophages, T cells and platelets.展开更多
Some important information on hydrocarbon generation, inclusion and migration inhighly-matured carbonates of lower Palaeozoic age from the Ordos Basin and Tarim Basin has been analyzed by a newly-combined laser-induce...Some important information on hydrocarbon generation, inclusion and migration inhighly-matured carbonates of lower Palaeozoic age from the Ordos Basin and Tarim Basin has been analyzed by a newly-combined laser-induced fluorescence microscope (LFM) designed by our laboratory. The following information has been obtained from the lower Ordovician lamellar carbonates with equivalent vitrinite reflectance (Ro) as high as 1.6%-1.7% and residual TOC of 0.14%-0.35% from the Ordos Basin: wide occurrences of oil and source macerals with strong fluorescence, including G.Prisca alginite, lamalginite, telalginite and algae-detrinite; fluorescing asphalt among mineral crystals; some groundmass and spheroid-like reservoir bitumen with high maturation levels in the pores of dolomites. Various kinds of fluorescing organic inclusions and asphalt have been found in the carbonates, calcareous shales and silt-shales with high maturation levels from the Cambrian-Ordovician strata in the Tarim Basin. All this helps us find展开更多
With the support of the National Natural Science Foundation of China,two original studies by the research group led by Prof.Gu Lin(谷林)and Prof.Zhang Qinghua(张庆华)from the Institute of Physics,Chinese Academy of Sc...With the support of the National Natural Science Foundation of China,two original studies by the research group led by Prof.Gu Lin(谷林)and Prof.Zhang Qinghua(张庆华)from the Institute of Physics,Chinese Academy of Sciences demonstrate the in-situ atomic-scale electrically induced展开更多
目的探讨抑制细胞迁移诱导蛋白(CEMIP)对缺氧复氧诱导的心脏微循环内皮细胞(CMEC)铁死亡的作用及其机制。方法分离培养原代大鼠CMEC,并分为正常组和缺氧复氧组(H/R组)。根据是否应用腺病毒下调CEMIP表达,进一步分为转染对照病毒+缺氧复...目的探讨抑制细胞迁移诱导蛋白(CEMIP)对缺氧复氧诱导的心脏微循环内皮细胞(CMEC)铁死亡的作用及其机制。方法分离培养原代大鼠CMEC,并分为正常组和缺氧复氧组(H/R组)。根据是否应用腺病毒下调CEMIP表达,进一步分为转染对照病毒+缺氧复氧组(sh-con+H/R组)和转染CEMIP下调病毒+缺氧复氧组(sh CEMIP+H/R组)。运用RNA测序技术筛选正常组与H/R组差异基因。采用CCK8法和Transwell法检测细胞的增殖和迁移能力,铁含量测定试剂盒检测铁离子含量,Hoechst 33342/PI双荧光染色检测CMEC的死亡,采用q PCR检测PTGS2 m RNA,免疫蛋白印记法检测CEMIP和SLC7A11蛋白的水平。结果RNA测序分析显示H/R组中CEMIP升高显著。与正常组比较,H/R组CMEC中CEMIP升高,增殖和迁移能力降低,同时细胞死亡增加,活性铁的含量、PTGS2 m RNA升高、SLC7A11蛋白降低(P<0.05)。此外,sh CEMIP+H/R组CMEC增殖、迁移能力和SLC7A11蛋白水平低于sh-con+H/R组,而活性铁含量、PTGS2水平高于sh-con+H/R组(P<0.05)。结论在缺氧复氧过程中,CEMIP可能靶向调控SLC7A11的表达来缓解CMEC的铁死亡。展开更多
基金financially supported by the National Key Research and Development Program (No. 2016YFC0801402)the National Natural Science Foundation of China (No. 51374236)Chongqing Research Program of Basic Research and Frontier Technology of China (No. cstc2015jcyj BX0076)
文摘Gas extraction practice has been proven for the clear majority of coal mines in China to be unfavorable using drill holes in the coal seam. Rather, mining-induced fractures in the goaf should be utilized for gas extraction. To study gas migration in mining-induced fractures, one mining face of 10 th Mine in Pingdingshan Coalmine Group in Henan, China, has been selected as the case study for this work. By establishing the mathematical model of gas migration under the influence of coal seam mining, discrete element software UDEC and Multiphysics software COMSOL are employed to model gas migration in mining-induced fractures above the goaf. The results show that as the working face advances, the goaf overburden gradually forms a mining-induced fracture network in the shape of a trapezoid, the size of which increases with the distance of coal face advance. Compared with gas migration in the overburden matrix, the gas flow in the fracture network due to mining is far greater. The largest mining-induced fracture is located at the upper end of the trapezoidal zone, which results in the largest gas flux in the network. When drilling for gas extraction in a mining-induced fracture field, the gas concentration is reduced in the whole region during the process of gas drainage, and the rate of gas concentration drops faster in the fractured zone. It is shown that with gas drainage, the gas flow velocity in the mininginduced fracture network is faster.
基金the National Natural Science Foundation of China(Grant no.81373045)the Provincial Natural Science Foundation of Hubei of China(Grant no.2015CFA139)
文摘Hexafluoroisopropanol(HFIP)-induced sodium dodecyl sulfate/dodecyltrimethylammonium bromide(SDS/DTAB) catanionic surfactant coacervate extraction method coupled with high performance liquid chromatography(HPLC) was used to detect the migration of phthalates from disposable tablewares to drinking water. The concentration factors are larger than 82 and extraction recoveries over 53% for water samples spiked with 100 or 200 ng/m L phthalates. Limit of detection is in the range of 1.0–2.6 ng/m L.Good linearity with correlation coefficients larger than 0.9985 is obtained in the concentration of20–1500 or 40–3000 ng/m L. Relative recoveries are from 82.4% to 123.6% for water samples spiked with30/60, 250/500, and 1500/3000 ng/m L phthalates, respectively. Relative standard deviations(RSDs) are0.4%–7.4% for intraday precision(n = 5) and 0.6%–7.8% for interday precision(n = 3). Four of studied phthalates are found in the drinking water samples prepared from four kinds of tablewares.
文摘Mechanisms on cancer cell migration and invasion have been major topics of cancer research and anti-cancer therapy development. Among the multiple cell signaling pathways involved in cell migration, those elicited by transforming growth factorβ（TGF-β） have attracted tremendous attention. The TGF-βpolypeptide cytokines include four isoforms：TGF-β1, TGF-β2, TGF-β3, and TGF-β4, which are secreted mainly from cells of white blood cell lineage, such as macrophages, T cells and platelets.
文摘Some important information on hydrocarbon generation, inclusion and migration inhighly-matured carbonates of lower Palaeozoic age from the Ordos Basin and Tarim Basin has been analyzed by a newly-combined laser-induced fluorescence microscope (LFM) designed by our laboratory. The following information has been obtained from the lower Ordovician lamellar carbonates with equivalent vitrinite reflectance (Ro) as high as 1.6%-1.7% and residual TOC of 0.14%-0.35% from the Ordos Basin: wide occurrences of oil and source macerals with strong fluorescence, including G.Prisca alginite, lamalginite, telalginite and algae-detrinite; fluorescing asphalt among mineral crystals; some groundmass and spheroid-like reservoir bitumen with high maturation levels in the pores of dolomites. Various kinds of fluorescing organic inclusions and asphalt have been found in the carbonates, calcareous shales and silt-shales with high maturation levels from the Cambrian-Ordovician strata in the Tarim Basin. All this helps us find
文摘With the support of the National Natural Science Foundation of China,two original studies by the research group led by Prof.Gu Lin(谷林)and Prof.Zhang Qinghua(张庆华)from the Institute of Physics,Chinese Academy of Sciences demonstrate the in-situ atomic-scale electrically induced
文摘目的探讨抑制细胞迁移诱导蛋白(CEMIP)对缺氧复氧诱导的心脏微循环内皮细胞(CMEC)铁死亡的作用及其机制。方法分离培养原代大鼠CMEC,并分为正常组和缺氧复氧组(H/R组)。根据是否应用腺病毒下调CEMIP表达,进一步分为转染对照病毒+缺氧复氧组(sh-con+H/R组)和转染CEMIP下调病毒+缺氧复氧组(sh CEMIP+H/R组)。运用RNA测序技术筛选正常组与H/R组差异基因。采用CCK8法和Transwell法检测细胞的增殖和迁移能力,铁含量测定试剂盒检测铁离子含量,Hoechst 33342/PI双荧光染色检测CMEC的死亡,采用q PCR检测PTGS2 m RNA,免疫蛋白印记法检测CEMIP和SLC7A11蛋白的水平。结果RNA测序分析显示H/R组中CEMIP升高显著。与正常组比较,H/R组CMEC中CEMIP升高,增殖和迁移能力降低,同时细胞死亡增加,活性铁的含量、PTGS2 m RNA升高、SLC7A11蛋白降低(P<0.05)。此外,sh CEMIP+H/R组CMEC增殖、迁移能力和SLC7A11蛋白水平低于sh-con+H/R组,而活性铁含量、PTGS2水平高于sh-con+H/R组(P<0.05)。结论在缺氧复氧过程中,CEMIP可能靶向调控SLC7A11的表达来缓解CMEC的铁死亡。
