Shale oil, an important unconventional resource （Hill R J, et al, 2007, Lucas W B, 2010）, is widely developed in lacstrine basins of East-China （Li Juyuan, et al, 2014）. Having representative geology characters of...Shale oil, an important unconventional resource （Hill R J, et al, 2007, Lucas W B, 2010）, is widely developed in lacstrine basins of East-China （Li Juyuan, et al, 2014）. Having representative geology characters of laetrine basins, the Dongying Depression＇s formation and evolution history provides favorable organic material and geological conditions for shale oil generation and preservation.展开更多
湿地生态健康评价对于掌握湿地的健康状况、理解人类活动干扰对其影响及实施生态预警等有重要意义。鄱阳湖对于维持其流域甚至长江中下游的生态平衡十分重要,目前尚未建立起其较完善的生态健康评价指标体系。大型底栖无脊椎动物完整性指...湿地生态健康评价对于掌握湿地的健康状况、理解人类活动干扰对其影响及实施生态预警等有重要意义。鄱阳湖对于维持其流域甚至长江中下游的生态平衡十分重要,目前尚未建立起其较完善的生态健康评价指标体系。大型底栖无脊椎动物完整性指数(benthic macroinvertebrate-based index of biotic integrity,B-IBI)是广泛应用的湿地生态健康评价方法。基于30个采样点(7个参照点,23个受损点)的大型底栖无脊椎动物采样数据,构建鄱阳湖湿地的B-IBI指数,采用自然断点法划分非常健康、健康、一般、差和极差5个健康等级标准,据此评价湿地生态健康状况。研究表明:(1)基于B-IBI指数的鄱阳湖湿地生态健康评价结果为一般;(2)就采样点B-IBI分值而言,呈现出西部健康状况优于东部的格局,其中国家级自然保护区内状况较好,而工业区、城镇、农田及河流入湖口附近状况较差;(3)B-IBI指数与前期构建的景观发展强度指数(LDI)、栖息地环境质量指数(QHEI)以及植被完整性指数(V-IBI)具有显著相关性,表明基于不同指数的评价结果较为一致。本研究构建的B-IBI指数能为鄱阳湖湿地的生态健康评价和监测提供重要方法。展开更多
目的探讨血清miR-132及miR-183在胃癌诊断中的价值。方法选取2014年1月-2017年3月海南西部中心医院收治的96例胃癌患者(胃癌组)和45例体检正常者(对照组),采用实时定量PCR法检测两组血清miR-132及miR-183表达水平,应用ROC曲线分析miR-13...目的探讨血清miR-132及miR-183在胃癌诊断中的价值。方法选取2014年1月-2017年3月海南西部中心医院收治的96例胃癌患者(胃癌组)和45例体检正常者(对照组),采用实时定量PCR法检测两组血清miR-132及miR-183表达水平,应用ROC曲线分析miR-132及miR-183对胃癌的诊断价值。结果胃癌组与对照组的性别(男/女:65/31 vs28/17)、年龄[(62.84±10.36)岁vs(60.46±9.72)岁]差异均无统计学意义(P均>0.05)。胃癌组血清miR-132(0.64±0.08 vs0.12±0.03)及miR-183(5.13±0.34 vs 0.87±0.05)表达水平均明显高于对照组(t=11.834、t=15.627,P<0.01)。ROC曲线分析显示,血清miR-132及miR-183联合诊断胃癌的AUC(95%CI)为[0.958(0.892~0.996)],明显优于miR-132[0.864(0.805~0.926)](Z=7.638,P=0.000)和miR-183[0.904(0.845~0.967)](Z=4.926,P=0.016),其敏感度和特异度为96.2%和87.4%。Pearson相关分析显示,胃癌患者血清miR-132与miR-183呈正相关(r=0.758,P<0.01)。结论血清miR-132及miR-183在胃癌患者中明显上调,有望作为胃癌诊断的新型肿瘤标记物。展开更多
Although a large amount of hydrocarbon exists in shale,only a part of hydrocarbon is movable because of the shale oil＇s flow ability character and the adsorption between hydrocarbon and minerals,kerogen,etc.Nuclear m...Although a large amount of hydrocarbon exists in shale,only a part of hydrocarbon is movable because of the shale oil＇s flow ability character and the adsorption between hydrocarbon and minerals,kerogen,etc.Nuclear magnetic resonance（NMR）cores analysis was commonly used to measure movable oil in conventional cores（Li Tai-wei,et al,2012;Li Zhentao,2011;Xiao Qiusheng,et al,2009）.展开更多
The molecular compositions and com- pound-specific carbon isotope compositions of indi- vidual long-chain n-alkanes of atmospheric aerosols collected during two severe Asian dust episodes in Qingdao in spring of 2002 ...The molecular compositions and com- pound-specific carbon isotope compositions of indi- vidual long-chain n-alkanes of atmospheric aerosols collected during two severe Asian dust episodes in Qingdao in spring of 2002 were analyzed using gas chromatography/mass spectrometry (GC/MS) and gas chromatography/isotope ratio mass spectrometry (GC/IRMS). Typical plant wax n-alkanes (C29 and C31) had lower δ 13C values than those from anthropo- genic (engine exhaust) sources (C21―C23). The av- erage δ 13C value of plant wax n-alkane C29 in non-dust episode periods was -30.5‰ (?30.3‰― ?31.9‰), while -31.3‰ (?31.1‰―?31.5‰) in dust episode periods; for C31, it was ?31.4‰ (?31.1‰― ?33.0‰) in non-dust episode periods, and ?31.7‰ (?31.3‰―?32.6‰) in dust episode periods. Plant wax in the dust episode samples was mainly from herbaceous plants via long-range transport, while local plant wax was mainly from deciduous plants and woody plants. In North China coast, 83.3% of the plant wax in the severe dust episode samples was from C3 plants while 80.0% for the non-dust samples, indicating that plant wax transported to the north- western Pacific Ocean by airborne dust from East Asia was mainly from C3 plants. The results suggestthat the molecular and molecular-isotopic composi- tions of individual long-chain n-alkanes can, as an effective indicator, identify the terrestrial organic components in the dust from East Asia and sedi- ments in the northwest Pacific Ocean.展开更多
文摘Shale oil, an important unconventional resource （Hill R J, et al, 2007, Lucas W B, 2010）, is widely developed in lacstrine basins of East-China （Li Juyuan, et al, 2014）. Having representative geology characters of laetrine basins, the Dongying Depression＇s formation and evolution history provides favorable organic material and geological conditions for shale oil generation and preservation.
文摘湿地生态健康评价对于掌握湿地的健康状况、理解人类活动干扰对其影响及实施生态预警等有重要意义。鄱阳湖对于维持其流域甚至长江中下游的生态平衡十分重要,目前尚未建立起其较完善的生态健康评价指标体系。大型底栖无脊椎动物完整性指数(benthic macroinvertebrate-based index of biotic integrity,B-IBI)是广泛应用的湿地生态健康评价方法。基于30个采样点(7个参照点,23个受损点)的大型底栖无脊椎动物采样数据,构建鄱阳湖湿地的B-IBI指数,采用自然断点法划分非常健康、健康、一般、差和极差5个健康等级标准,据此评价湿地生态健康状况。研究表明:(1)基于B-IBI指数的鄱阳湖湿地生态健康评价结果为一般;(2)就采样点B-IBI分值而言,呈现出西部健康状况优于东部的格局,其中国家级自然保护区内状况较好,而工业区、城镇、农田及河流入湖口附近状况较差;(3)B-IBI指数与前期构建的景观发展强度指数(LDI)、栖息地环境质量指数(QHEI)以及植被完整性指数(V-IBI)具有显著相关性,表明基于不同指数的评价结果较为一致。本研究构建的B-IBI指数能为鄱阳湖湿地的生态健康评价和监测提供重要方法。
文摘目的探讨血清miR-132及miR-183在胃癌诊断中的价值。方法选取2014年1月-2017年3月海南西部中心医院收治的96例胃癌患者(胃癌组)和45例体检正常者(对照组),采用实时定量PCR法检测两组血清miR-132及miR-183表达水平,应用ROC曲线分析miR-132及miR-183对胃癌的诊断价值。结果胃癌组与对照组的性别(男/女:65/31 vs28/17)、年龄[(62.84±10.36)岁vs(60.46±9.72)岁]差异均无统计学意义(P均>0.05)。胃癌组血清miR-132(0.64±0.08 vs0.12±0.03)及miR-183(5.13±0.34 vs 0.87±0.05)表达水平均明显高于对照组(t=11.834、t=15.627,P<0.01)。ROC曲线分析显示,血清miR-132及miR-183联合诊断胃癌的AUC(95%CI)为[0.958(0.892~0.996)],明显优于miR-132[0.864(0.805~0.926)](Z=7.638,P=0.000)和miR-183[0.904(0.845~0.967)](Z=4.926,P=0.016),其敏感度和特异度为96.2%和87.4%。Pearson相关分析显示,胃癌患者血清miR-132与miR-183呈正相关(r=0.758,P<0.01)。结论血清miR-132及miR-183在胃癌患者中明显上调,有望作为胃癌诊断的新型肿瘤标记物。
文摘Although a large amount of hydrocarbon exists in shale,only a part of hydrocarbon is movable because of the shale oil＇s flow ability character and the adsorption between hydrocarbon and minerals,kerogen,etc.Nuclear magnetic resonance（NMR）cores analysis was commonly used to measure movable oil in conventional cores（Li Tai-wei,et al,2012;Li Zhentao,2011;Xiao Qiusheng,et al,2009）.
基金This work was supported by the National Natural Science Foundation of China （Grant Nos： 40276016, 90211022）.
文摘The molecular compositions and com- pound-specific carbon isotope compositions of indi- vidual long-chain n-alkanes of atmospheric aerosols collected during two severe Asian dust episodes in Qingdao in spring of 2002 were analyzed using gas chromatography/mass spectrometry (GC/MS) and gas chromatography/isotope ratio mass spectrometry (GC/IRMS). Typical plant wax n-alkanes (C29 and C31) had lower δ 13C values than those from anthropo- genic (engine exhaust) sources (C21―C23). The av- erage δ 13C value of plant wax n-alkane C29 in non-dust episode periods was -30.5‰ (?30.3‰― ?31.9‰), while -31.3‰ (?31.1‰―?31.5‰) in dust episode periods; for C31, it was ?31.4‰ (?31.1‰― ?33.0‰) in non-dust episode periods, and ?31.7‰ (?31.3‰―?32.6‰) in dust episode periods. Plant wax in the dust episode samples was mainly from herbaceous plants via long-range transport, while local plant wax was mainly from deciduous plants and woody plants. In North China coast, 83.3% of the plant wax in the severe dust episode samples was from C3 plants while 80.0% for the non-dust samples, indicating that plant wax transported to the north- western Pacific Ocean by airborne dust from East Asia was mainly from C3 plants. The results suggestthat the molecular and molecular-isotopic composi- tions of individual long-chain n-alkanes can, as an effective indicator, identify the terrestrial organic components in the dust from East Asia and sedi- ments in the northwest Pacific Ocean.
