Based on the geochemical,seismic,logging and drilling data,the Fuyu reservoirs of the Lower Cretaceous Quantou Formation in northern Songliao Basin are systematically studied in terms of the geological characteristics...Based on the geochemical,seismic,logging and drilling data,the Fuyu reservoirs of the Lower Cretaceous Quantou Formation in northern Songliao Basin are systematically studied in terms of the geological characteristics,the tight oil enrichment model and its major controlling factors.First,the Quantou Formation is overlaid by high-quality source rocks of the Upper Cretaceous Qingshankou Formation,with the development of nose structure around sag and the broad and continuous distribution of sand bodies.The reservoirs are tight on the whole.Second,the configuration of multiple elements,such as high-quality source rocks,reservoir rocks,fault,overpressure and structure,controls the tight oil enrichment in the Fuyu reservoirs.The source-reservoir combination controls the tight oil distribution pattern.The pressure difference between source and reservoir drives the charging of tight oil.The fault-sandbody transport system determines the migration and accumulation of oil and gas.The positive structure is the favorable place for tight oil enrichment,and the fault-horst zone is the key part of syncline area for tight oil exploration.Third,based on the source-reservoir relationship,transport mode,accumulation dynamics and other elements,three tight oil enrichment models are recognized in the Fuyu reservoirs:(1)vertical or lateral migration of hydrocarbon from source rocks to adjacent reservoir rocks,that is,driven by overpressure,hydrocarbon generated is migrated vertically or laterally to and accumulates in the adjacent reservoir rocks;(2)transport of hydrocarbon through faults between separated source and reservoirs,that is,driven by overpressure,hydrocarbon migrates downward through faults to the sandbodies that are separated from the source rocks;and(3)migration of hydrocarbon through faults and sandbodies between separated source and reservoirs,that is,driven by overpressure,hydrocarbon migrates downwards through faults to the reservoir rocks that are separated from the source rocks,and then migrates laterally through sandbodies.Fourth,the differences in oil source conditions,charging drive,fault distribution,sandbody and reservoir physical properties cause the differential enrichment of tight oil in the Fuyu reservoirs.Comprehensive analysis suggests that the Fuyu reservoir in the Qijia-Gulong Sag has good conditions for tight oil enrichment and has been less explored,and it is an important new zone for tight oil exploration in the future.展开更多
目的探究血清miR-135b和miR-145在未破裂颅内动脉瘤(unruptured intracranial aneurysm,UIA)患者中的表达水平及临床价值。方法选取2018年5月~2020年3月邯郸市第一医院神外三科收治的102例UIA患者作为研究组,另选同期健康体检者95例作...目的探究血清miR-135b和miR-145在未破裂颅内动脉瘤(unruptured intracranial aneurysm,UIA)患者中的表达水平及临床价值。方法选取2018年5月~2020年3月邯郸市第一医院神外三科收治的102例UIA患者作为研究组,另选同期健康体检者95例作为对照组,同时收集受试者一般资料进行比较。实时荧光聚合酶链反应(qRT-PCR)法检测血清中miR-135b和miR-145表达水平;ROC曲线分析血清miR-135b和miR-145对UIA的诊断价值;Logistic回归分析UIA形成的影响因素。结果研究组中高血压(62.75%)、高血脂(60.00%)、吸烟史(64.76%)、饮酒史(70.59%)患者所占比例高于对照组(46.72%,44.21%,47.37%,53.68%),差异均有统计学意义(χ^(2)=5.361,4.986,6.139,5.993,均P<0.05);研究组患者血清miR-135b(0.79±0.20)表达水平低于对照组(1.03±0.27),血清miR-145水平(1.28±0.24)高于对照组(0.99±0.22),差异均有统计学意义(t=7.122,8.821,均P<0.05);与动脉瘤个数为1及动脉瘤直径<7mm的患者相比,动脉瘤个数≥2及动脉瘤直径≥7mm的患者血清中miR-135b表达水平(0.68±0.18 vs 0.84±0.21,0.71±0.17mm vs 0.85±0.22mm)降低,miR-145水平(1.37±0.31mm vs 1.24±0.21mm,1.37±0.30mm vs 1.21±0.19mm)升高,差异均有统计学意义(t=2.472~3.689,均P<0.05);血清miR-135b,miR-145以及二者联合诊断UIA的曲线下面积(AUC)分别为0.788,0.836和0.907,二者联合的诊断效能优于其各自单独检测(Z=4.236,3.226,均P<0.05);Logistic回归分析结果显示,高血压(OR=1.326,95%CI=1.044~1.684)、吸烟史(OR=1.457,95%CI=1.077~1.970)、饮酒史(OR=1.879,95%CI=1.113~3.171)、血清miR-135b水平<0.94(OR=0.758,95%CI=0.612~0.939)、血清miR-145水平≥1.22(OR=1.433,95%CI=1.113~1.845)均是UIA的影响因素(均P<0.05)。结论UIA患者血清miR-135b水平下调,miR-145水平上调,二者与UIA的形成和发展存在相关性,且二者联合检测对UIA形成的诊断效能较高。展开更多
Objective The Hailar Basin is situated in the northwestern margin of the Jiamusi-Mongolia Block.It was a continent marginal basin to the south of the Mongolia-Okhotsk Ocean during the Jurassic and Cretaceous.The basem...Objective The Hailar Basin is situated in the northwestern margin of the Jiamusi-Mongolia Block.It was a continent marginal basin to the south of the Mongolia-Okhotsk Ocean during the Jurassic and Cretaceous.The basement of the basin is a late Paleozoic marine deposit.The filling of the basin is characterized by terrestrial volcanic rocks。展开更多
Agarases are hydrolytic enzymes that act on the hydrolysis of agar and have a broad range of applications in food,cosmetics and pharmaceutical industries. In this study, a glycerol feeding strategy based on induction ...Agarases are hydrolytic enzymes that act on the hydrolysis of agar and have a broad range of applications in food,cosmetics and pharmaceutical industries. In this study, a glycerol feeding strategy based on induction mode optimization for high cell density and β-agarase production was established, which could effectively control acetate yield. First, exponential feeding strategy of glycerol with different overall specific growth rates（μ） was applied in the pre-induction phase. The results showed that the low μ（μ=0.2） was suggested to be the optimal for cell growth and β-agarase production. Second, the effects of induction temperature and the inducer concentration on cell growth and β-agarase production were investigated in the post-induction phase. When induced by isopropyl-β-d-thiogalactoside（IPTG）, the strategy of 0.8 mmol/L IPTG induction at 20℃ was found to be optimal for β-agarase production. When cultivation was induced by continuous lactose feeding strategy of 1.0 g/（L·h）, the β-agarase activity reached 112.5 U/mL, which represented the highest β-agarase production to date.Furthermore, the β-agarase was capable of degrading G. lemaneiformis powder directly to produce neoagarooligosaccharide, and the hydrolysates were neoagarotetraose（NA4） and neoagarohexaose（NA6）. The overall research may be useful for the industrial production and application of β-agarase.展开更多
基金Supported by the PetroChina Science and Technology Major Project(2016E0201)。
文摘Based on the geochemical,seismic,logging and drilling data,the Fuyu reservoirs of the Lower Cretaceous Quantou Formation in northern Songliao Basin are systematically studied in terms of the geological characteristics,the tight oil enrichment model and its major controlling factors.First,the Quantou Formation is overlaid by high-quality source rocks of the Upper Cretaceous Qingshankou Formation,with the development of nose structure around sag and the broad and continuous distribution of sand bodies.The reservoirs are tight on the whole.Second,the configuration of multiple elements,such as high-quality source rocks,reservoir rocks,fault,overpressure and structure,controls the tight oil enrichment in the Fuyu reservoirs.The source-reservoir combination controls the tight oil distribution pattern.The pressure difference between source and reservoir drives the charging of tight oil.The fault-sandbody transport system determines the migration and accumulation of oil and gas.The positive structure is the favorable place for tight oil enrichment,and the fault-horst zone is the key part of syncline area for tight oil exploration.Third,based on the source-reservoir relationship,transport mode,accumulation dynamics and other elements,three tight oil enrichment models are recognized in the Fuyu reservoirs:(1)vertical or lateral migration of hydrocarbon from source rocks to adjacent reservoir rocks,that is,driven by overpressure,hydrocarbon generated is migrated vertically or laterally to and accumulates in the adjacent reservoir rocks;(2)transport of hydrocarbon through faults between separated source and reservoirs,that is,driven by overpressure,hydrocarbon migrates downward through faults to the sandbodies that are separated from the source rocks;and(3)migration of hydrocarbon through faults and sandbodies between separated source and reservoirs,that is,driven by overpressure,hydrocarbon migrates downwards through faults to the reservoir rocks that are separated from the source rocks,and then migrates laterally through sandbodies.Fourth,the differences in oil source conditions,charging drive,fault distribution,sandbody and reservoir physical properties cause the differential enrichment of tight oil in the Fuyu reservoirs.Comprehensive analysis suggests that the Fuyu reservoir in the Qijia-Gulong Sag has good conditions for tight oil enrichment and has been less explored,and it is an important new zone for tight oil exploration in the future.
文摘目的探究血清miR-135b和miR-145在未破裂颅内动脉瘤(unruptured intracranial aneurysm,UIA)患者中的表达水平及临床价值。方法选取2018年5月~2020年3月邯郸市第一医院神外三科收治的102例UIA患者作为研究组,另选同期健康体检者95例作为对照组,同时收集受试者一般资料进行比较。实时荧光聚合酶链反应(qRT-PCR)法检测血清中miR-135b和miR-145表达水平;ROC曲线分析血清miR-135b和miR-145对UIA的诊断价值;Logistic回归分析UIA形成的影响因素。结果研究组中高血压(62.75%)、高血脂(60.00%)、吸烟史(64.76%)、饮酒史(70.59%)患者所占比例高于对照组(46.72%,44.21%,47.37%,53.68%),差异均有统计学意义(χ^(2)=5.361,4.986,6.139,5.993,均P<0.05);研究组患者血清miR-135b(0.79±0.20)表达水平低于对照组(1.03±0.27),血清miR-145水平(1.28±0.24)高于对照组(0.99±0.22),差异均有统计学意义(t=7.122,8.821,均P<0.05);与动脉瘤个数为1及动脉瘤直径<7mm的患者相比,动脉瘤个数≥2及动脉瘤直径≥7mm的患者血清中miR-135b表达水平(0.68±0.18 vs 0.84±0.21,0.71±0.17mm vs 0.85±0.22mm)降低,miR-145水平(1.37±0.31mm vs 1.24±0.21mm,1.37±0.30mm vs 1.21±0.19mm)升高,差异均有统计学意义(t=2.472~3.689,均P<0.05);血清miR-135b,miR-145以及二者联合诊断UIA的曲线下面积(AUC)分别为0.788,0.836和0.907,二者联合的诊断效能优于其各自单独检测(Z=4.236,3.226,均P<0.05);Logistic回归分析结果显示,高血压(OR=1.326,95%CI=1.044~1.684)、吸烟史(OR=1.457,95%CI=1.077~1.970)、饮酒史(OR=1.879,95%CI=1.113~3.171)、血清miR-135b水平<0.94(OR=0.758,95%CI=0.612~0.939)、血清miR-145水平≥1.22(OR=1.433,95%CI=1.113~1.845)均是UIA的影响因素(均P<0.05)。结论UIA患者血清miR-135b水平下调,miR-145水平上调,二者与UIA的形成和发展存在相关性,且二者联合检测对UIA形成的诊断效能较高。
基金supported by the National Natural Science Foundation of China(grant Nos.31670215,31270277)。
文摘Objective The Hailar Basin is situated in the northwestern margin of the Jiamusi-Mongolia Block.It was a continent marginal basin to the south of the Mongolia-Okhotsk Ocean during the Jurassic and Cretaceous.The basement of the basin is a late Paleozoic marine deposit.The filling of the basin is characterized by terrestrial volcanic rocks。
基金The Public Science and Technology Research Funds Projects of Ocean under contract No.201505026the Fujian Province Natural Science Foundation under contract Nos 2016J01160 and 2017N0015the Scientific Research Foundation of Third Institute of Oceanography,SOA under contract No.2016038
文摘Agarases are hydrolytic enzymes that act on the hydrolysis of agar and have a broad range of applications in food,cosmetics and pharmaceutical industries. In this study, a glycerol feeding strategy based on induction mode optimization for high cell density and β-agarase production was established, which could effectively control acetate yield. First, exponential feeding strategy of glycerol with different overall specific growth rates（μ） was applied in the pre-induction phase. The results showed that the low μ（μ=0.2） was suggested to be the optimal for cell growth and β-agarase production. Second, the effects of induction temperature and the inducer concentration on cell growth and β-agarase production were investigated in the post-induction phase. When induced by isopropyl-β-d-thiogalactoside（IPTG）, the strategy of 0.8 mmol/L IPTG induction at 20℃ was found to be optimal for β-agarase production. When cultivation was induced by continuous lactose feeding strategy of 1.0 g/（L·h）, the β-agarase activity reached 112.5 U/mL, which represented the highest β-agarase production to date.Furthermore, the β-agarase was capable of degrading G. lemaneiformis powder directly to produce neoagarooligosaccharide, and the hydrolysates were neoagarotetraose（NA4） and neoagarohexaose（NA6）. The overall research may be useful for the industrial production and application of β-agarase.
