Selection the Calli Lines of High PAP Production from Phylacca america and Research in the Resistence of PAP to TMV

商陆抗病毒蛋白(PAP)是一种广谱的植物抗病毒蛋白.本试验以商陆叶片为外植体,在附加0.5 mg/L 2,4-D(2,4-二氯苯氧乙酸)和0.5 mg/L 6-BA(6-苄氨基嘌呤)的MS培养基上诱导愈伤组织,通过继代筛选培养获得3个稳定的愈伤组织株系:黄色系(Y-型)、粉色系(P-型)、红色系(R-型),不同株系具有不同的生长特性.Northern杂交结果证明不同株系中PAP基因转录水平有明显差异.离体烟草叶片摩擦接种实验表明,不同株系的蛋白提取液对TMV均具有显著抗性,其中黄色株系具有较明显的优势.商陆离体愈伤组织的研究为生产安全、高效的植物源抗病毒制剂提供了一定基础.PAP is a kind of broadspectrum antivirus protein.A callus induction system was developed for Phytolacca americana on MS medium supplement with 0.5 mg/L 2,4-D and 0.5 mg/L 6-BA.Three stable types specialized in morphology,color,and growth characteristics were obtained after 2-years subculture and selection: type Y was yellow-green and compact,and grew relatively slow.Type P was white pink and watery.Type R was dark red and crisp,and grew fastest.The results Northern blot also revealed the different transcription level of PAP gene in different lines.Disease challenge test of detached tobacco leaves with TMV showed that the resistance was dramatically enhanced when TMV treated by protein of different calli lines,especially type Y.The result implicated that callus culture of Phylacca america in vitro had a potential application in the production of the safe,efficiency plant viral inhibitor

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

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^