Hydrate phase transition may pose risks in pipeline blockage and severe challenges for offshore natural gas hydrate pro-duction.The present work involves the development of a multiphase gas-liquid-solid vertical slug ...Hydrate phase transition may pose risks in pipeline blockage and severe challenges for offshore natural gas hydrate pro-duction.The present work involves the development of a multiphase gas-liquid-solid vertical slug flow hydrodynamic model consi-dering hydrate phase transition kinetics with heat and mass transfer behaviors.The varying gas physical properties due to pressure and temperature variations are also introduced to evaluate vertical slug flow characteristics.The proposed model is used to carry out a series of numerical simulations to examine the interactions between hydrate phase transition and vertical slug flow hydrodynamics.Furthermore,the hydrate volumetric fractions under different pressure and temperature conditions are predicted.The results reveal that hydrate formation and gas expansion cause the mixture superficial velocity,and the gas and liquid fractions,void fraction in liq-uid slug,and unit length tend to decrease.The increase in outlet pressure leads to an increased hydrate formation rate,which not only increases the hydrate volumetric fraction along the pipe but also causes the upward shift of the hydrate phase transition critical point.展开更多
目的观察β-catenin/Slug信号特异性抑制剂FH535与EMT的关系,探讨LPCAT1在调节子宫颈癌细胞侵袭、转移和生长中的作用。方法采用sh-NC和sh-LPCAT1转染Hela细胞,利用载体(Vector)组和LPCAT1过表达质粒转染SiHa细胞,将SiHa细胞分为对照组(...目的观察β-catenin/Slug信号特异性抑制剂FH535与EMT的关系,探讨LPCAT1在调节子宫颈癌细胞侵袭、转移和生长中的作用。方法采用sh-NC和sh-LPCAT1转染Hela细胞,利用载体(Vector)组和LPCAT1过表达质粒转染SiHa细胞,将SiHa细胞分为对照组(Con)、LPCAT1组、LPCAT1+FH535组和FH535组。运用CCK-8法和集落形成试验检测子宫颈癌细胞的增殖。通过伤口愈合试验和Transwell实验检测子宫颈癌细胞的转移、侵袭能力。应用Western blot分析细胞中LPCAT1、β-catenin/Slug信号通路和EMT相关蛋白的表达。结果与Vector组相比,LPCAT1组SiHa细胞的活力、集落数、迁移和侵袭细胞数均显著增加(P<0.05);与sh-NC组相比,sh-LPCAT1组Hela细胞的活力、集落数、迁移和侵袭细胞数均显著降低(P<0.05)。与LPCAT1组相比,LPCAT1+FH535组SiHa细胞中Wnt4(1.18±0.05 vs 0.80±0.06)、β-catenin(1.05±0.08 vs 0.77±0.05)、Slug(1.13±0.06 vs 0.28±0.02)、Cyclin D1(0.99±0.06 vs 0.44±0.02)、N-cadherin(0.91±0.07 vs 0.46±0.03)和vimentin(0.95±0.06 vs 0.49±0.03)表达降低(P<0.05),E-cadherin(0.44±0.03 vs 0.58±0.03)表达增加(P<0.05)。此外,与LPCAT1组相比,LPCAT1+FH535组SiHa细胞的集落数(224±15 vs 146±11)、迁移数(85±3 vs 51±4)和侵袭数(166±10 vs 90±5)均降低(P<0.05)。结论LPCAT1表达增加可能通过激活β-catenin/Slug信号通路促进子宫颈癌的转移和进展,LPCAT1的靶向治疗有望提高子宫颈癌患者的预后。展开更多
目的探究E-钙黏蛋白(E-cadherin)、wnt-1诱导分泌蛋白2(wnt-1 inducible secreted protein-2,WISP2)和Slug蛋白与食管胃交界腺癌(adenocarcinoma of the esophagogastric junction,AEG)临床病理因素及预后的关系。方法选取2021年1月至2...目的探究E-钙黏蛋白(E-cadherin)、wnt-1诱导分泌蛋白2(wnt-1 inducible secreted protein-2,WISP2)和Slug蛋白与食管胃交界腺癌(adenocarcinoma of the esophagogastric junction,AEG)临床病理因素及预后的关系。方法选取2021年1月至2022年3月在本院胃肠外科行手术治疗的114例AEG确诊患者,术中留取其癌灶组织与癌旁组织,通过免疫组化染色检测组织中E-cadherin、WISP2、Slug蛋白的表达情况,分析上述指标表达与AEG病理因素的关系,绘制KM曲线探究不同E-cadherin、WISP2、Slug蛋白表达患者的预后情况。结果癌灶组织E-cadherin、WISP2蛋白表达阳性率均低于癌旁组织(P<0.05),但其Slug蛋白表达阳性率高于癌旁组织(P<0.05)。在E-cadherin表达阳性率上,年龄≥50岁患者低于<50岁患者(P<0.05);TNM分期Ⅲ期患者低于Ⅰ~Ⅱ期患者(P<0.05);浸润深度>1/2患者低于≤1/2患者(P<0.05)。在WISP2表达阳性率上,高分化患者低于低、中分化患者(P<0.05);浸润深度>1/2患者低于≤1/2患者(P<0.05)。在Slug蛋白表达阳性率上,高分化高于低、中分化患者(P<0.05);浸润深度>1/2患者高于≤1/2患者(P<0.05);淋巴结转移患者高于无淋巴结转移患者(P<0.05)。Slug蛋白均分别与E-cadherin、WISP2呈负相关(r=-0.301、-0.289,P<0.05)。E-cadherin表达阳性组、阴性组生存时间分别为为(19.71±0.84)个月、(15.85±1.02)个月,阳性组生存时间长于阴性组(P<0.05)。WISP2表达阳性组、阴性组生存时间分别为(19.84±0.83)个月、(18.52±1.82)个月,阳性组生存时间长于阴性组(P<0.05)。Slug表达阳性组、阴性组生存时间分别为为(16.06±0.93)个月、(19.66±0.92)个月,阳性组生存时间短于阴性组(P<0.05)。结论E-cadherin、WISP2、Slug蛋白在AEG患者中异常表达,其表达与AEG的发生、转移以及侵袭等病理因素相关,可作为临床预测AEG患者预后的潜在指标。展开更多
The liquid slug length distribution is crucial for designing the downstream processing system with mul-tiphase pipeline. Experiments were conducted in a 133m long horizontal test loop. The measurements were per-formed...The liquid slug length distribution is crucial for designing the downstream processing system with mul-tiphase pipeline. Experiments were conducted in a 133m long horizontal test loop. The measurements were per-formed by conductivity probes to determine the liquid slug length distribution. The data covered both the slug and plug flow regimes. From experimental results, the mean liquid slug lengths were relatively insensitive to gas and liquid flow rates in the higher mixture velocity range. But in the lower mixture velocity range, the mean liquid slug length decreased and then increased with mixture velocity. It shows that the development length of slug flow was longer than x/D=1157. A slug tracking model was adapted to study the evolution of liquid slug length distribution in a horizontal pipeline. In the present model, the wake effect of elongated bubble and the pressure drop due to accel-eration are taken into account and random slug lengths are introduced at the entrance. The results of the model are compared with the measured slug length distributions of slug flow regime. It shows that the predicted mean and maximum slug lengths are in agreement with the experimental data at x/D=1157 and the form of the slug length distributions is also predicted well by the model.展开更多
Slug initiation and subsequem evolution along a 5.0 cm ID, 16m long horizomal pipe are experimentally studied. The transient characteristics of interfacial structures are described by using simultaneous measuremeres o...Slug initiation and subsequem evolution along a 5.0 cm ID, 16m long horizomal pipe are experimentally studied. The transient characteristics of interfacial structures are described by using simultaneous measuremeres of the liquid height at multiple locations along the pipe. Various effects of superficial gas and liquid velocities and pressure oscillation on the slug initiation and evolution along the pipe are illustrated. It is found that the slug is initiated by a deterministic orocess with reolenishmem and deoletion of liquid near the inlet for the superficial gas velocity USG〈3.0m·s^-1 and by a stochastic process with wave coalescence along the pipe for USG〉3.0m·s^-1.The evolution of the slugs is strongly attected by superhclal gas and liquid veloclties for USG〈3.0m·s^-1 but weakly affected by the superficial gas velocity for USG〉3.0 m·s . The suppression of pressure oscillation at the pipe inlet significantly delays the onset of slugging, with slugs forming postponed further downstream. The slug frequency at the outlet is, however, not affected by the variation in the pressure oscillation.展开更多
目的研究血管内皮生长因子C(VEGF-C)促子宫颈癌细胞侵袭能力的影响,探讨Slug在其中的作用及相关信号转导途径。方法体外培养宫颈癌细胞株Si Ha细胞,观察VEGF-C对ERK1/2磷酸化及Slug蛋白表达的影响;转染Slug si RNA后,采用transwell侵袭...目的研究血管内皮生长因子C(VEGF-C)促子宫颈癌细胞侵袭能力的影响,探讨Slug在其中的作用及相关信号转导途径。方法体外培养宫颈癌细胞株Si Ha细胞,观察VEGF-C对ERK1/2磷酸化及Slug蛋白表达的影响;转染Slug si RNA后,采用transwell侵袭小室法观察其对宫颈癌细胞株增殖和侵袭的影响。结果 VEGF-C(100 ng/m L)处理Si Ha细胞12、24、48 h后,均能促进Slug蛋白表达,其表达幅度分别为(162.4±6.8)%、(202.8±9.4)%、(236.6±15.5)%,与对照组比较,差异均有统计学意义(P<0.05)。同时,VEGF-C处理后可促进ERK1/2蛋白磷酸化,表达幅度分别为(162.6±20.4)%、(197.8±25.6)%、(152.3±14.6)%,与对照组比较,差异均有统计学意义(P<0.05)。转染ERK1/2 si RNA可显著抑制VEGF-C促Slug表达的效应。Si Ha细胞转染特异性Slug si RNA 48 h后,VEGF-C促细胞侵袭的能力明显减弱。结论 VEGF-C可能通过激活ERK1/2,上调Slug蛋白表达,促进宫颈癌侵袭能力及其恶性进展。展开更多
目的:研究Slug与食管癌侵袭转移间的关系及其调控机制。方法:分别将构建好的pc DNA 3.1-Slug和miR-140通过Lip 2000转染到Eca-109中,以pc DNA 3.1和Lip 2000空转作为对照组,显微镜下观察转染前后细胞的形态变化,检测细胞中E-钙黏素、N-...目的:研究Slug与食管癌侵袭转移间的关系及其调控机制。方法:分别将构建好的pc DNA 3.1-Slug和miR-140通过Lip 2000转染到Eca-109中,以pc DNA 3.1和Lip 2000空转作为对照组,显微镜下观察转染前后细胞的形态变化,检测细胞中E-钙黏素、N-钙黏蛋白和波形蛋白的表达情况变化,另外使用穿透小室法检测细胞的侵袭能力在转染前后的变化情况。结果:转染pc DNA 3.1-Slug和miR-140到Eca-109中后细胞变得细长。转染pc DNA 3.1-Slug的Eca-109中E-钙黏素表达下调,N-钙黏蛋白和波形蛋白表达上调,细胞穿透基质胶的数量明显增多。转染miR-140的Eca-109中E-钙黏素表达上调,N-钙黏蛋白和波形蛋白表达下调,细胞穿透基质胶的数量明显减少。在食管癌细胞中miR-140和Slug的表达呈负相关(r=-0.96)。结论:转录因子Slug能够提高食管癌上皮细胞的间质转化能力和侵袭能力,而miR-140是通过调控Slug来调节食管癌细胞侵袭性的。展开更多
基金supported by the National Natural Science Foundation of China(No.52301355)the Natu-ral Science Foundation of Qingdao Municipality(No.23-2-1-108-zyyd-jch)the China University of Petroleum(East China)Independent Innovation Research Project(Science and Engineering)-Leading Talent Cultivation Fund(No.24CX07001A).
文摘Hydrate phase transition may pose risks in pipeline blockage and severe challenges for offshore natural gas hydrate pro-duction.The present work involves the development of a multiphase gas-liquid-solid vertical slug flow hydrodynamic model consi-dering hydrate phase transition kinetics with heat and mass transfer behaviors.The varying gas physical properties due to pressure and temperature variations are also introduced to evaluate vertical slug flow characteristics.The proposed model is used to carry out a series of numerical simulations to examine the interactions between hydrate phase transition and vertical slug flow hydrodynamics.Furthermore,the hydrate volumetric fractions under different pressure and temperature conditions are predicted.The results reveal that hydrate formation and gas expansion cause the mixture superficial velocity,and the gas and liquid fractions,void fraction in liq-uid slug,and unit length tend to decrease.The increase in outlet pressure leads to an increased hydrate formation rate,which not only increases the hydrate volumetric fraction along the pipe but also causes the upward shift of the hydrate phase transition critical point.
文摘目的观察β-catenin/Slug信号特异性抑制剂FH535与EMT的关系,探讨LPCAT1在调节子宫颈癌细胞侵袭、转移和生长中的作用。方法采用sh-NC和sh-LPCAT1转染Hela细胞,利用载体(Vector)组和LPCAT1过表达质粒转染SiHa细胞,将SiHa细胞分为对照组(Con)、LPCAT1组、LPCAT1+FH535组和FH535组。运用CCK-8法和集落形成试验检测子宫颈癌细胞的增殖。通过伤口愈合试验和Transwell实验检测子宫颈癌细胞的转移、侵袭能力。应用Western blot分析细胞中LPCAT1、β-catenin/Slug信号通路和EMT相关蛋白的表达。结果与Vector组相比,LPCAT1组SiHa细胞的活力、集落数、迁移和侵袭细胞数均显著增加(P<0.05);与sh-NC组相比,sh-LPCAT1组Hela细胞的活力、集落数、迁移和侵袭细胞数均显著降低(P<0.05)。与LPCAT1组相比,LPCAT1+FH535组SiHa细胞中Wnt4(1.18±0.05 vs 0.80±0.06)、β-catenin(1.05±0.08 vs 0.77±0.05)、Slug(1.13±0.06 vs 0.28±0.02)、Cyclin D1(0.99±0.06 vs 0.44±0.02)、N-cadherin(0.91±0.07 vs 0.46±0.03)和vimentin(0.95±0.06 vs 0.49±0.03)表达降低(P<0.05),E-cadherin(0.44±0.03 vs 0.58±0.03)表达增加(P<0.05)。此外,与LPCAT1组相比,LPCAT1+FH535组SiHa细胞的集落数(224±15 vs 146±11)、迁移数(85±3 vs 51±4)和侵袭数(166±10 vs 90±5)均降低(P<0.05)。结论LPCAT1表达增加可能通过激活β-catenin/Slug信号通路促进子宫颈癌的转移和进展,LPCAT1的靶向治疗有望提高子宫颈癌患者的预后。
文摘目的探究E-钙黏蛋白(E-cadherin)、wnt-1诱导分泌蛋白2(wnt-1 inducible secreted protein-2,WISP2)和Slug蛋白与食管胃交界腺癌(adenocarcinoma of the esophagogastric junction,AEG)临床病理因素及预后的关系。方法选取2021年1月至2022年3月在本院胃肠外科行手术治疗的114例AEG确诊患者,术中留取其癌灶组织与癌旁组织,通过免疫组化染色检测组织中E-cadherin、WISP2、Slug蛋白的表达情况,分析上述指标表达与AEG病理因素的关系,绘制KM曲线探究不同E-cadherin、WISP2、Slug蛋白表达患者的预后情况。结果癌灶组织E-cadherin、WISP2蛋白表达阳性率均低于癌旁组织(P<0.05),但其Slug蛋白表达阳性率高于癌旁组织(P<0.05)。在E-cadherin表达阳性率上,年龄≥50岁患者低于<50岁患者(P<0.05);TNM分期Ⅲ期患者低于Ⅰ~Ⅱ期患者(P<0.05);浸润深度>1/2患者低于≤1/2患者(P<0.05)。在WISP2表达阳性率上,高分化患者低于低、中分化患者(P<0.05);浸润深度>1/2患者低于≤1/2患者(P<0.05)。在Slug蛋白表达阳性率上,高分化高于低、中分化患者(P<0.05);浸润深度>1/2患者高于≤1/2患者(P<0.05);淋巴结转移患者高于无淋巴结转移患者(P<0.05)。Slug蛋白均分别与E-cadherin、WISP2呈负相关(r=-0.301、-0.289,P<0.05)。E-cadherin表达阳性组、阴性组生存时间分别为为(19.71±0.84)个月、(15.85±1.02)个月,阳性组生存时间长于阴性组(P<0.05)。WISP2表达阳性组、阴性组生存时间分别为(19.84±0.83)个月、(18.52±1.82)个月,阳性组生存时间长于阴性组(P<0.05)。Slug表达阳性组、阴性组生存时间分别为为(16.06±0.93)个月、(19.66±0.92)个月,阳性组生存时间短于阴性组(P<0.05)。结论E-cadherin、WISP2、Slug蛋白在AEG患者中异常表达,其表达与AEG的发生、转移以及侵袭等病理因素相关,可作为临床预测AEG患者预后的潜在指标。
基金Supported by the National Natural Science Foundation of China (No.50536020 and 50323001).
文摘The liquid slug length distribution is crucial for designing the downstream processing system with mul-tiphase pipeline. Experiments were conducted in a 133m long horizontal test loop. The measurements were per-formed by conductivity probes to determine the liquid slug length distribution. The data covered both the slug and plug flow regimes. From experimental results, the mean liquid slug lengths were relatively insensitive to gas and liquid flow rates in the higher mixture velocity range. But in the lower mixture velocity range, the mean liquid slug length decreased and then increased with mixture velocity. It shows that the development length of slug flow was longer than x/D=1157. A slug tracking model was adapted to study the evolution of liquid slug length distribution in a horizontal pipeline. In the present model, the wake effect of elongated bubble and the pressure drop due to accel-eration are taken into account and random slug lengths are introduced at the entrance. The results of the model are compared with the measured slug length distributions of slug flow regime. It shows that the predicted mean and maximum slug lengths are in agreement with the experimental data at x/D=1157 and the form of the slug length distributions is also predicted well by the model.
基金Supported by the National Natural Science Foundation of China （50521604） and the State Key Development Program for Basic Research of China （2007CB029804）.
文摘Slug initiation and subsequem evolution along a 5.0 cm ID, 16m long horizomal pipe are experimentally studied. The transient characteristics of interfacial structures are described by using simultaneous measuremeres of the liquid height at multiple locations along the pipe. Various effects of superficial gas and liquid velocities and pressure oscillation on the slug initiation and evolution along the pipe are illustrated. It is found that the slug is initiated by a deterministic orocess with reolenishmem and deoletion of liquid near the inlet for the superficial gas velocity USG〈3.0m·s^-1 and by a stochastic process with wave coalescence along the pipe for USG〉3.0m·s^-1.The evolution of the slugs is strongly attected by superhclal gas and liquid veloclties for USG〈3.0m·s^-1 but weakly affected by the superficial gas velocity for USG〉3.0 m·s . The suppression of pressure oscillation at the pipe inlet significantly delays the onset of slugging, with slugs forming postponed further downstream. The slug frequency at the outlet is, however, not affected by the variation in the pressure oscillation.
文摘目的:研究Slug与食管癌侵袭转移间的关系及其调控机制。方法:分别将构建好的pc DNA 3.1-Slug和miR-140通过Lip 2000转染到Eca-109中,以pc DNA 3.1和Lip 2000空转作为对照组,显微镜下观察转染前后细胞的形态变化,检测细胞中E-钙黏素、N-钙黏蛋白和波形蛋白的表达情况变化,另外使用穿透小室法检测细胞的侵袭能力在转染前后的变化情况。结果:转染pc DNA 3.1-Slug和miR-140到Eca-109中后细胞变得细长。转染pc DNA 3.1-Slug的Eca-109中E-钙黏素表达下调,N-钙黏蛋白和波形蛋白表达上调,细胞穿透基质胶的数量明显增多。转染miR-140的Eca-109中E-钙黏素表达上调,N-钙黏蛋白和波形蛋白表达下调,细胞穿透基质胶的数量明显减少。在食管癌细胞中miR-140和Slug的表达呈负相关(r=-0.96)。结论:转录因子Slug能够提高食管癌上皮细胞的间质转化能力和侵袭能力,而miR-140是通过调控Slug来调节食管癌细胞侵袭性的。
