Research progress in roles of gut microbiota and bile acid metabolism in development and progression of NAFLD

随着肥胖及代谢综合征的流行,非酒精性脂肪性肝病的患病率逐年递增,在该病的发生和发展过程中,肠道菌群和胆汁酸代谢均发挥重要作用。讨论了肠道菌群和胆汁酸代谢之间的关系,重点强调了肠道菌群、胆汁酸和胆汁酸受体在非酒精性脂肪性肝病发生发展的过程中所起到的作用。With the prevalence of obesity and metabolic syndrome,the incidence of nonalcoholic fatty liver disease(NAFLD) is increasing year by year.Studies have uncovered the important roles of gut microbiota and bile acid metabolism in the development and progression of NAFLD.The roles of gut microbiota,as well bile acid and bile acid receptors,in the development and progression of NAFLD are highlighted.艾滋病和病毒性肝炎等重大传染病防治国家科技重大专项(2012ZX10002004-011); 天津市科技计划项目(13RCGFSY19200

Optimization of Synthesizing Aza[60]fullerene

氮杂富勒烯是目前唯一得到较为广泛研究的杂富勒烯,但较低的合成产率成为了制约其深入研究的主要障碍.本研究对比了氮杂[60]富勒烯的Wudl、gAn、HIrSCH等3种合成方法,并对Wudl法的影响因素进行了系统研究,经工艺优化,显著地抑制了从C60到羰基内酰胺中间产物合成过程中的副产物的生成,基于回收原料C60的羰基内酰胺中间产物产率达63.9%,氮杂[60]富勒烯的总产率由11.3%提高到20.9%,且过量C60可高效回收并直接使用.本研究基于对影响氮杂[60]富勒烯合成产率的因素的深入探讨,提出的工艺较Wudl法降低了氮杂[60]富勒烯的制备成本,为进一步探索氮杂富勒烯的性质规律和应用前景创造了有利条件.The azafullerenes are the only known heterofullerenes that have been investigated widely,typically exemplified by aza[60]fullerene,in which one or more carbons are substituted by nitrogen atom(s)in C60 cage.Extensive attention has been paid owing to its unique structure and reactive activities,but its in-depth study and application are restricted by its low yield.This paper summarized the research background and recent progress of azafullerenes,compared the three synthetic methods(Gan′s method,Hirsch′s method and Wudl′s method)for aza[60]fullerene dimer,and focused on optimizing the Wudl′s method systematically.Especially,the by-products in the conversion process from C60 to fulleroid had been inhibited efficiently.The yield of fulleroid had increased to63.9% based on recycling C60.The total yield of aza[60]fullerene had increased from 11.3%to 20.9%,and the excess C60 could be isolated and used again.This optimization reduced the cost of preparing aza[60]fullerene,and made the aza[60]fullerenes more easily available compared with Wudl′s method,which would create opportunities for probing more interesting nature and important application in the future study of azafullerenes.国家重点基础研究发展计划(973计划)(2014CB845601); 国家自然科学基金海峡联合基金项目(20131004

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^

Prediction of Energy Resolution in the JUNO Experiment

International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies