半边旗二萜类化合物5F对人翼状胬肉成纤维细胞结缔组织生长因子表达和胶原合成的影响

[目的]观察半边旗二萜类化合物5F（5F）对体外培养的人翼状胬肉成纤维细胞（HPF）增殖和胶原合成及结缔组织生长因子（CTGF）表达的影响.[方法]利用手术切除的人翼状胬肉组织进行原代细胞培养,即得到HPF.将不同质量不同浓度（0、8、32、128）μg/mL的5F作用于HPF 24 h,通过噻唑蓝比色法（MTT）检测5F对细胞增殖的作用;用逆转录聚合酶链反应（RT-PCR）和蛋白质印迹（Western blot）检测5F对细胞中CTGFmRNA及蛋白表达水平的影响;用化学比色法检测5F对细胞胶原蛋白含量的影响.[结果]在HPF中加入不同质量浓度（0、8、32、128）μg/mL的5F作用24 h,各组剂量的5F均可以明显抑制HPF的增殖（P＜0.01）,其半数抑制率（IC50）为32.12μg/mL.在8～128μg/mL的剂量范围内,5F能显著地下调CTGF mRNA（0.69±0.05,0.38±0.06,0.19±0.04,与对照组0.82±0.09比较,P＜0.05或P＜0.01）和CTGF蛋白（82.34±5.16,31.46±4.98,23.28±2.65,与对照组98.12±7.20比较,P＜0.05或P＜0.01）的表达水平,能显著地降低胶原蛋白的含量（13.95±1.49,12.53±0.51,5.89±0.80,与对照组16.19±1.02比较,P＜0.05或P＜0.01）,且均有明显的剂量-效应关系.[结论]半边旗二萜类化合物5F能显著地抑制体外培养的HPF的增殖和胶原蛋白的含量,使细胞的CTGF mRNA及蛋白表达明显下调,并且呈显著的量效关系,表明半边旗5F具有体外抗纤维化作用,这为寻找有效治疗HPF的药物提供了新的思路

Chemical constituents and cytotoxicity assay research in small polar substances from Vitis thunbergii var. taiwaniana

该文对小叶山葡萄地上部分化学成分进行了研究,运用硅胶柱色谱,OdS中低压柱色谱,SEPHAdEX lH-20凝胶柱色谱,分析型和制备型HPlC从小叶山葡萄60%乙醇提取物大孔树脂95%乙醇-水洗脱部位分离得到12个化合物,利用高分辨质谱,核磁共振等波谱手段鉴定其结构分别为:(1)bETulInIC ACId,(2)2,2,2'-bIS(4-HydrOXyPHEnyl)PrOPAnE bIS(2,3-EPOXyPrOPyl)ETHEr,(3)ErIOdICTyOl,(4)TrAnS-ε-VInIfErIn,(5)(+)-CIS-ε-VInIfErIn,(6)kObOPHEnOl A,(7)AMPElOPSIn A,(8)nEPAlEnHEnOl,(9)CIS-MIyAbEnOl C,(10)CIS-VITISIn b,(11)CIS-gnETIn H和(12)(+)-HOPEAPHEnOl。化合物2,5,6,8,9,10,11均为首次从为葡萄属中分离得到的化合物,化合物3,7,12为首次从小叶山葡萄中分离得到的化合物。在作用浓度为50μMOl·l-1下,化合物6,7和11对MCf-7(乳腺癌细胞株)具有较明显的体外生长抑制作用,其抑制率分别为66.58%,57.16%,52.84%。This article studied the chemical constituents from the aerial part of Vitis thunbergii var.taiwaniana.The 60% ethanol extract was eluted with 95% ethanol though HP-20 macroporous adsorption resin column.12 compounds,including( 1) betulinic acid,( 2) 2,2,2'-bis( 4-hydroxyphenyl) propane bis( 2,3-epoxypropyl) ether,( 3) eriodictyol,( 4) trans-ε-viniferin,( 5)( +)-cis-ε-viniferin,( 6) kobophenol A,( 7) ampelopsin A,( 8) nepalensinol B,( 9) cis-miyabenol C,( 10) cis-vitisin B,( 11) cis-gnetin H and( 12)( +)-hopeaphenol,were separated by using normal phase silica gel,ODS,Sephdadex LH-20 column chromatographies and semi-preparative or preparative HPLC.Compounds 2,5,6,8,9,10,11 were separated from the genus Vitis for the first time and compounds 3,7,12 were separated from Vitis thunbergii var.taiwaniana for the first time.At a concentration of 50 μmol·L-1,compound6,7 and 11 showed strong cytotoxicity against MCF-7 cell lines with the inhibition rate of 66.58%,57.16%,52.84%,respectively.国家自然科学基金青年基金项目(81202419

GaAs/AlGaAs二维电子气（2DEG）散射机理研究

采用三角阱近似,计算了GaAs/AlGaAs二维电子气(2DEG)电子只占据基态子带时,由极性光学声子、声学形变势、声学压电势、远程电离杂质、本底电离杂质合金无序以及界面粗糙等七种主要的散射机制决定的电子迁移率与温度、2DEG浓度、本底电离杂质浓度、以及界面不平整度等的关系。理论计算结果与实验符合很好

高电子迁移率GaAs/AlxGa（1-x）As二维电子气（2DEG）异质结结构参数优化研究

采用三角阱近似,考虑了GaAs/Al_xGa_(1-x)As二维电子气(2DEG)异质结中七种主要的散射机制,计算了2DEG电子迁移率与隔离层厚度(d)和Al组分(x)的关系,对GaAs/Al_xGa_(1-x)As异质结的结构参数进行了优化分析。就作者所知,该文首次计算了2DEG电子迁移率与Al组分x的关系,得到了与实验规律一致的结果

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements