巨噬细胞移动抑制因子诱导血管生成相关基因的表达

【目的】研究巨噬细胞移动抑制因子（MIF）对人血管内皮细胞表达血管生成相关基因的诱导作用。【方法】通过亚克隆，构建原核表达质粒pET22b-MIF，并转化人工程菌B121（DE3）。用Ni-亲合柱分离纯化BL21（DE3）中经IPTG诱导表达的重组MIF。用巨噬细胞移动抑制试验鉴定复性的重组MIF的活性。分别用0、30、60、120ng／mL的重组MIF处理人血管内皮细胞12h，通过Real-time定量PCR检测人血管内皮细胞中VEGF165、FGFR3、MMP9、TGF-α、PDGF-α的mRNA表达。用体外血管生成试验检测重组MIF诱导人血管内皮细胞的成管腔作用。[结果]正确构建了重组质粒pET22b-MIF。经IPTG诱导，在大肠杆菌中以包涵体形式表达出重组MIF。复性的重组MIF对巨噬细胞移动的抑制水平达30％（P＜0.05）。重组MIF能特异地诱导HVECs中VEGF165、FGFR3、MMP9、TGF-α、PDGF-α表达，并能特异地诱导人血管内皮细胞形成管腔结构。【结论】在大肠杆菌中成功表达出MIF，MIF能特异地诱导人血管内皮细胞中血管生成相关基因的表达

Extending Atomic-resolution Electrochemical Scanning Tunneling Microscopy Studies to Polycrystalline Electrode SurFaces

Electrochemical Scanning TUnneling Microscopy (ECSTM) has been extended to characterizc polycrystalline silver electrode surFaces in iodide solution.Potential-dependcnt ordered and disordered structures of the silver electrode as well as the iodine adsorption layer have been obscrved to coexist on polycrystalline silver electrode surFaces, For the First time.A very special column arrangement of the iodine adsorption layer, similar to the so called "ndssing row" type of structure has been obseryed.Some columns of the iodine adsorption layer roll over From one place to another along with the time and changing potential.A proposed model has been given to better describe the structure.The highly corrugated and loose surFace structure of the polycrystalline surFace are responsible For this special phenomenon.固体表面物理化学国家重点实验室和国家自然科学基

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

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^