Fluid coking on micro-spherical particles with acid sites on them could produce more light oils from Tahe AR.The conversion rate could increase by about 20% on the catalyst B compared to that obtained on the catalyst ...Fluid coking on micro-spherical particles with acid sites on them could produce more light oils from Tahe AR.The conversion rate could increase by about 20% on the catalyst B compared to that obtained on the catalyst A and the light oil yield could increase by about 12%.The yield of gasoline and diesel was more than 50% from Tahe AR over the catalyst B.Tests on acidity of the catalyst B by pyridine FT-IR spectrometry showed that the total acid content and the ratio of weak acid number to total acid number were higher than other catalysts.展开更多
Herein,an electrochemically driven catalyst-free nucleophilic aromatic substitution(S_(N)Ar)of electron-rich fluoroarenes with carboxylic acids as weak nucleophiles under mild conditions was reported.A series of highl...Herein,an electrochemically driven catalyst-free nucleophilic aromatic substitution(S_(N)Ar)of electron-rich fluoroarenes with carboxylic acids as weak nucleophiles under mild conditions was reported.A series of highly valuable ester derivatives were obtained in a direct and rapid way.This transformation features commercially available reagents and an exceptionally broad substrate scope with good functional group tolerance,using cheap and abundant electrodes and completed within a short reaction time.Gram-scale synthesis and complex biorelevant compounds ligation further highlighted the potential utility of the methodology.The mechanistic investigations and density functional theory(DFT)calculations verified the feasibility of the proposed pathway of this transformation.展开更多
Azo dyes have received considerable attention because of their association with various human health problems. The aim of the investigation is to determine the adsorption behavior ofazo dyes in aqueous solution on DG0...Azo dyes have received considerable attention because of their association with various human health problems. The aim of the investigation is to determine the adsorption behavior ofazo dyes in aqueous solution on DG06, GSE17200, and GSE17201 soils using C. I. Acid Red 14 （AR14） as example. The experimental results indicate that the Freundlich model expresses the adsorption isotherm better than the Langmuir model and the pseudo-second-order model achieves adsorption of AR14 on the three soils well. Based on the pseudo-second-order model, the adsorption thermodynamic of AR14 on DG06 soil have been studied and the thermodynamics parameter of AGO is determined and AGO value shows the adsorption process of AR14 on DG06 is mainly physical in nature. Furthermore, the effects of temperature, pH and salinity （NaC1） on adsorption have been investigated. The decrease in pH or the increase in salinity enhances the adsorption of AR14 by DG06, GSE17200, and GSE17201.展开更多
目的:探讨广防己提取物(RAFE)所致的大鼠慢性肾间质纤维化的作用机制。方法:用广防己提取物(200 mg.kg-1.d-1)和马兜铃酸(AA,10.0 mg.kg-1.d-1)给予大鼠间断灌胃22周,造成大鼠慢性间质纤维化模型,通过免疫组化方法观察肾小管上皮细胞转...目的:探讨广防己提取物(RAFE)所致的大鼠慢性肾间质纤维化的作用机制。方法:用广防己提取物(200 mg.kg-1.d-1)和马兜铃酸(AA,10.0 mg.kg-1.d-1)给予大鼠间断灌胃22周,造成大鼠慢性间质纤维化模型,通过免疫组化方法观察肾小管上皮细胞转分化标志性蛋白角蛋白(CK)、平滑肌肌动蛋白(α-SMA)和波形蛋白(V im entin)以及致纤维化因子-转化生长因子(TGF-β1)在大鼠肾小管间质的表达。结果:经图像分析,RAFE和AA组肾小管上皮细胞CK较对照组表达减弱,而α-SMA在肾小管上皮细胞及肾间质细胞呈弱阳性表达、V im entin表达较对照组明显增多;同时RAFE和AA组大鼠肾小管TGF-β1表达较对照组明显增多,各项指标统计学均有显著性差异。结论:RAFE参与了肾小管上皮细胞转分化,促进了大鼠慢性肾小管上皮纤维化的发生,其中TGF-β1对肾小管上皮细胞转分化起到重要作用。RAFE所致大鼠慢性肾小管上皮细胞转分化机制与AA作用相似。展开更多
文摘Fluid coking on micro-spherical particles with acid sites on them could produce more light oils from Tahe AR.The conversion rate could increase by about 20% on the catalyst B compared to that obtained on the catalyst A and the light oil yield could increase by about 12%.The yield of gasoline and diesel was more than 50% from Tahe AR over the catalyst B.Tests on acidity of the catalyst B by pyridine FT-IR spectrometry showed that the total acid content and the ratio of weak acid number to total acid number were higher than other catalysts.
基金Financial support from National Key R&D Program of China(2022YFA1503200)National Natural Science Foundation of China(Grant No.22371149,22188101)+2 种基金the Fundamental Research Funds for the Central Universities(No.63223015)Frontiers Science Center for New Organic Matter,Nankai University(Grant No.63181206)Nankai University are gratefully acknowledged.
文摘Herein,an electrochemically driven catalyst-free nucleophilic aromatic substitution(S_(N)Ar)of electron-rich fluoroarenes with carboxylic acids as weak nucleophiles under mild conditions was reported.A series of highly valuable ester derivatives were obtained in a direct and rapid way.This transformation features commercially available reagents and an exceptionally broad substrate scope with good functional group tolerance,using cheap and abundant electrodes and completed within a short reaction time.Gram-scale synthesis and complex biorelevant compounds ligation further highlighted the potential utility of the methodology.The mechanistic investigations and density functional theory(DFT)calculations verified the feasibility of the proposed pathway of this transformation.
文摘Azo dyes have received considerable attention because of their association with various human health problems. The aim of the investigation is to determine the adsorption behavior ofazo dyes in aqueous solution on DG06, GSE17200, and GSE17201 soils using C. I. Acid Red 14 （AR14） as example. The experimental results indicate that the Freundlich model expresses the adsorption isotherm better than the Langmuir model and the pseudo-second-order model achieves adsorption of AR14 on the three soils well. Based on the pseudo-second-order model, the adsorption thermodynamic of AR14 on DG06 soil have been studied and the thermodynamics parameter of AGO is determined and AGO value shows the adsorption process of AR14 on DG06 is mainly physical in nature. Furthermore, the effects of temperature, pH and salinity （NaC1） on adsorption have been investigated. The decrease in pH or the increase in salinity enhances the adsorption of AR14 by DG06, GSE17200, and GSE17201.
文摘目的:探讨广防己提取物(RAFE)所致的大鼠慢性肾间质纤维化的作用机制。方法:用广防己提取物(200 mg.kg-1.d-1)和马兜铃酸(AA,10.0 mg.kg-1.d-1)给予大鼠间断灌胃22周,造成大鼠慢性间质纤维化模型,通过免疫组化方法观察肾小管上皮细胞转分化标志性蛋白角蛋白(CK)、平滑肌肌动蛋白(α-SMA)和波形蛋白(V im entin)以及致纤维化因子-转化生长因子(TGF-β1)在大鼠肾小管间质的表达。结果:经图像分析,RAFE和AA组肾小管上皮细胞CK较对照组表达减弱,而α-SMA在肾小管上皮细胞及肾间质细胞呈弱阳性表达、V im entin表达较对照组明显增多;同时RAFE和AA组大鼠肾小管TGF-β1表达较对照组明显增多,各项指标统计学均有显著性差异。结论:RAFE参与了肾小管上皮细胞转分化,促进了大鼠慢性肾小管上皮纤维化的发生,其中TGF-β1对肾小管上皮细胞转分化起到重要作用。RAFE所致大鼠慢性肾小管上皮细胞转分化机制与AA作用相似。
