A series of both unsupported and coal‐supported iron–oxygen compounds with gradual changes in microstructure were synthesized by a precipitation‐oxidation process at 20 to 70°*** relationship between the micro...
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A series of both unsupported and coal‐supported iron–oxygen compounds with gradual changes in microstructure were synthesized by a precipitation‐oxidation process at 20 to 70°*** relationship between the microstructures and catalytic activities of these precursors during direct coal liquefaction was *** results show that the microstructure could be controlled through adjusting the synthesis temperature during the precipitation‐oxidation procedure,and that compounds synthesized at lower temperatures exhibit higher catalytic *** a result of their higher proportions ofγ‐FeOOH orα‐FeOOH crystalline phases,the unsupported iron–oxygen compounds synthesized at 20–30°C,which also had high specific surface areas and moisture levels,generate oil yields 4.5%–4.6%higher than those obtained with precursors synthesized at 70°*** was also determined that higher oil yields were obtained when the catalytically‐active phase formed by the precursors during liquefaction(pyrrhotite,Fe1-xS)had smaller *** coal added as a carrier was found to efficiently disperse the active precursors,which in turn significantly improved the catalytic activity during coal liquefaction.
In pancreatic ductal adenocarcinoma (PDAC), stromal cells and matrix proteins form a dense physical barrier that, while preventing the outward spread of tumor cells, also limits the penetration of drugs and CD8+ T cel...
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In pancreatic ductal adenocarcinoma (PDAC), stromal cells and matrix proteins form a dense physical barrier that, while preventing the outward spread of tumor cells, also limits the penetration of drugs and CD8+ T cells inward. Additionally, the overactivated TGF-beta/SMAD signaling pathway further promotes matrix proliferation and immune suppression. Therefore, crossing the stromal barrier while preserving the integrity of the stroma, releasing drugs intratumorally, remodeling the stroma, and activating the immune system is a promising drug delivery strategy. In this work, a type of enamine N-oxides modified nanoparticle was prepared, with stearic acid-modified gemcitabine prodrug (GemC18) and pSMAD2/3 inhibitor galunisertib encapsulated. The peripheral enamine N-oxides can trigger transcytosis and then respond to hypoxia and acidic microenvironments, turning the surface charge of the nanoparticles to a positive charge and enhancing penetration. The released galunisertib inhibits the TGF-beta/SMAD signaling pathway, reshapes the matrix, activates antitumor immunity, and combines with gemcitabine (Gem) to kill tumor cells.
目的:系统评价玉屏风散加减辅助治疗过敏性鼻炎的疗效和安全性,为临床提供循证参考。方法:计算机检索万方数据库、中文科技期刊数据库、中国期刊全文数据库、中国生物医学文献数据库、Cochrane图书馆、EMBase、Pub Med,收集玉屏风散加减联合化学药(试验组)对比单纯化学药(对照组)治疗过敏性鼻炎的随机对照试验,提取资料并按照Cochrane系统评价员手册5.1.0评价纳入研究质量,采用Rev Man 5.2统计软件进行Meta分析。结果:共纳入15项RCT,合计1 366例患者。Meta分析结果显示,试验组患者总有效率[OR=3.95,95%CI(2.80,5.58),P<0.001]显著高于对照组,复发率[OR=0.37,95%CI(0.22,0.63),P<0.001]和不良反应发生率[OR=0.15,95%CI(0.06,0.35),P<0.001]显著低于对照组,差异均有统计学意义。结论:玉屏风散加减辅助治疗过敏性鼻炎疗效较好,可以降低复发率,安全性亦较好。
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