DI-3-n-butylphthalide is used to treat mild and moderate acute ischemic stroke.However,the precise underlying mechanism requires further investigation.In this study,we investigated the molecular mechanism of DI-3-n-bu...DI-3-n-butylphthalide is used to treat mild and moderate acute ischemic stroke.However,the precise underlying mechanism requires further investigation.In this study,we investigated the molecular mechanism of DI-3-n-butylphthalide action by various means.We used hydrogen peroxide to induce injury to PC12cells and RAW264.7 cells to mimic neuronal oxidative stress injury in stroke in vitro and examined the effects of DI-3-n-butylphthalide.We found that DI-3-nbutylphthalide pretreatment markedly inhibited the reduction in viability and reactive oxygen species production in PC12 cells caused by hydrogen peroxide and inhibited cell apoptosis.Furthermore,DI-3-n-butylphthalide pretreatment inhibited the expression of the pro-apoptotic genes Bax and Bnip3.DI-3-nbutylphthalide also promoted ubiquitination and degradation of hypoxia inducible factor 1α,the key transcription factor that regulates Bax and Bnip3 genes.These findings suggest that DI-3-n-butylphthalide exhibits a neuroprotective effect on stroke by promoting hypoxia inducible factor-1α ubiquitination and degradation and inhibiting cell apoptosis.展开更多
Axial and torsional impact drilling technology is used to improve the drilling efficiency of hard rock formation in the deep underground.Still,the corresponding theory is not mature,and there are few correlative resea...Axial and torsional impact drilling technology is used to improve the drilling efficiency of hard rock formation in the deep underground.Still,the corresponding theory is not mature,and there are few correlative research reports on the rock-breaking mechanism of axial and torsional coupled impact drilling tools.Considering the influence of the impact hammer geometry and movement on the dynamic load parameters(i.e.,wavelength,amplitude,frequency,and phase difference),a numerical model that includes a hard formation and single polycrystalline diamond compact cutter was established.The Riedel-Hiermaier-Thoma model,which considers the dynamic damage and strength behavior of rocks,was adopted to analyze the rock damage under axial and torsional impact loads.The numerical simu-lation results were verified by the experimental results.It was found that compared with conventional drilling,the penetration depths of axial,torsional,and axial-torsional coupled impact drilling increased by 31.3%,5.6%,and 34.7%,respectively.Increasing the wavelength and amplitude of the axial impact stress wave improved the penetration depth.When the bit rotation speed remained unchanged,increasing the frequency in the axial and circumferential directions had little effect on the penetration depth.However,as the frequency increased,the cutting surface became increasingly smooth,which reduced the occurrence of bit vibration.When the phase difference between the axial and circumfer-ential stress waves was 25%,the penetration depth significantly increased.In addition,the bit vibration problem can be effectively reduced.Finally,the adjustment of engineering and tool structure parameters is proposed to optimize the efficiency of the axial-torsional coupled impact drilling tool.展开更多
目的探讨炎症指标及肿瘤标志物联合检测对肺癌远处转移的预测价值。方法选取河北医科大学第四医院肺癌患者133例作为研究组,根据转移情况分为转移组、未转移组,检测外周血中性粒细胞/淋巴细胞比值(NLR)、细胞因子及肿瘤标志物,筛选肺癌...目的探讨炎症指标及肿瘤标志物联合检测对肺癌远处转移的预测价值。方法选取河北医科大学第四医院肺癌患者133例作为研究组,根据转移情况分为转移组、未转移组,检测外周血中性粒细胞/淋巴细胞比值(NLR)、细胞因子及肿瘤标志物,筛选肺癌远处转移的危险因素,以Logistic回归分析构建模型,采用受试者工作特征(ROC)曲线分析评估该模型对肺癌远处转移的预测效能,并以河北医科大学第一医院98例肺癌患者作为验证组进行验证。结果转移组NLR、白细胞介素(IL)-8、癌胚抗原(CEA)、细胞角蛋白19片段(CYFRA21-1)、神经元特异性烯醇化酶(NSE)水平均明显高于未转移组,差异有统计学意义(P<0.05);多因素Logistic回归分析结果显示,IL-8(OR=1.008,P=0.014)、CYFRA21-1(OR=1.067,P=0.035)水平升高是预测肺癌远处转移的独立危险因素,联合二者建立的风险预测模型为Logit(P)=-2.217+0.008 X IL-8+0.081 X CYFRA21-1,对预测肺癌远处转移有良好的效能,在研究组、验证组中曲线下面积分别为0.820和0.744,灵敏度分别为91.2%和80.0%,准确率分别为78.9%和72.4%。结论IL-8、CYFRA21-1水平升高是肺癌远处转移的独立危险因素,二者联合构建的风险预测模型预测肺癌远处转移具有良好的性能。展开更多
Organic rich dark shale of Q Formation can be found in many areas(e.g.,in the North of S Basin).The shale target stratum is easy to hydrate and often undergoes spallation.Therefore,centering the casing in the horizont...Organic rich dark shale of Q Formation can be found in many areas(e.g.,in the North of S Basin).The shale target stratum is easy to hydrate and often undergoes spallation.Therefore,centering the casing in the horizontal section of the irregular borehole is relatively difficult.Similarly,achieving a good cementflushing efficiency under complex borehole conditions is a complex task.Through technologies such as centralizer,efficient preflushing,multi-stageflushing and ductile cement slurry,better performances can be achieved.In this study,it is shown that the cementing rate in the DY2H horizontal section is 97.8%,which is more than 34%higher than that of adjacent wells.This cementing matching technology for sidetracking horizontal wells can be used to improve the cementing quality of continental shale and provides a reference for future applications in thisfield.展开更多
文摘DI-3-n-butylphthalide is used to treat mild and moderate acute ischemic stroke.However,the precise underlying mechanism requires further investigation.In this study,we investigated the molecular mechanism of DI-3-n-butylphthalide action by various means.We used hydrogen peroxide to induce injury to PC12cells and RAW264.7 cells to mimic neuronal oxidative stress injury in stroke in vitro and examined the effects of DI-3-n-butylphthalide.We found that DI-3-nbutylphthalide pretreatment markedly inhibited the reduction in viability and reactive oxygen species production in PC12 cells caused by hydrogen peroxide and inhibited cell apoptosis.Furthermore,DI-3-n-butylphthalide pretreatment inhibited the expression of the pro-apoptotic genes Bax and Bnip3.DI-3-nbutylphthalide also promoted ubiquitination and degradation of hypoxia inducible factor 1α,the key transcription factor that regulates Bax and Bnip3 genes.These findings suggest that DI-3-n-butylphthalide exhibits a neuroprotective effect on stroke by promoting hypoxia inducible factor-1α ubiquitination and degradation and inhibiting cell apoptosis.
基金supported by the National Natural Science Foundation of China(52004013,U1762211).
文摘Axial and torsional impact drilling technology is used to improve the drilling efficiency of hard rock formation in the deep underground.Still,the corresponding theory is not mature,and there are few correlative research reports on the rock-breaking mechanism of axial and torsional coupled impact drilling tools.Considering the influence of the impact hammer geometry and movement on the dynamic load parameters(i.e.,wavelength,amplitude,frequency,and phase difference),a numerical model that includes a hard formation and single polycrystalline diamond compact cutter was established.The Riedel-Hiermaier-Thoma model,which considers the dynamic damage and strength behavior of rocks,was adopted to analyze the rock damage under axial and torsional impact loads.The numerical simu-lation results were verified by the experimental results.It was found that compared with conventional drilling,the penetration depths of axial,torsional,and axial-torsional coupled impact drilling increased by 31.3%,5.6%,and 34.7%,respectively.Increasing the wavelength and amplitude of the axial impact stress wave improved the penetration depth.When the bit rotation speed remained unchanged,increasing the frequency in the axial and circumferential directions had little effect on the penetration depth.However,as the frequency increased,the cutting surface became increasingly smooth,which reduced the occurrence of bit vibration.When the phase difference between the axial and circumfer-ential stress waves was 25%,the penetration depth significantly increased.In addition,the bit vibration problem can be effectively reduced.Finally,the adjustment of engineering and tool structure parameters is proposed to optimize the efficiency of the axial-torsional coupled impact drilling tool.
文摘目的探讨炎症指标及肿瘤标志物联合检测对肺癌远处转移的预测价值。方法选取河北医科大学第四医院肺癌患者133例作为研究组,根据转移情况分为转移组、未转移组,检测外周血中性粒细胞/淋巴细胞比值(NLR)、细胞因子及肿瘤标志物,筛选肺癌远处转移的危险因素,以Logistic回归分析构建模型,采用受试者工作特征(ROC)曲线分析评估该模型对肺癌远处转移的预测效能,并以河北医科大学第一医院98例肺癌患者作为验证组进行验证。结果转移组NLR、白细胞介素(IL)-8、癌胚抗原(CEA)、细胞角蛋白19片段(CYFRA21-1)、神经元特异性烯醇化酶(NSE)水平均明显高于未转移组,差异有统计学意义(P<0.05);多因素Logistic回归分析结果显示,IL-8(OR=1.008,P=0.014)、CYFRA21-1(OR=1.067,P=0.035)水平升高是预测肺癌远处转移的独立危险因素,联合二者建立的风险预测模型为Logit(P)=-2.217+0.008 X IL-8+0.081 X CYFRA21-1,对预测肺癌远处转移有良好的效能,在研究组、验证组中曲线下面积分别为0.820和0.744,灵敏度分别为91.2%和80.0%,准确率分别为78.9%和72.4%。结论IL-8、CYFRA21-1水平升高是肺癌远处转移的独立危险因素,二者联合构建的风险预测模型预测肺癌远处转移具有良好的性能。
基金funded by the CNPC Science and Technology Department Project(2021ZZ10-03)。
文摘Organic rich dark shale of Q Formation can be found in many areas(e.g.,in the North of S Basin).The shale target stratum is easy to hydrate and often undergoes spallation.Therefore,centering the casing in the horizontal section of the irregular borehole is relatively difficult.Similarly,achieving a good cementflushing efficiency under complex borehole conditions is a complex task.Through technologies such as centralizer,efficient preflushing,multi-stageflushing and ductile cement slurry,better performances can be achieved.In this study,it is shown that the cementing rate in the DY2H horizontal section is 97.8%,which is more than 34%higher than that of adjacent wells.This cementing matching technology for sidetracking horizontal wells can be used to improve the cementing quality of continental shale and provides a reference for future applications in thisfield.
