新品种异育银鲫“中科3号”简介

<正>2008年的雪灾造成了一定数量的亲鱼和鱼种的死亡,使今年的苗种供给压力很大。为在特殊时期发展我省渔业生产,调整好水产产品结构,同时结合今年湖北省水产局推荐的十大品种宣传工作,现对异育银鲫"中科3号"予以简要介绍

两种绿藻辅助饲喂对克氏原螯虾生理活性的影响

以克氏原螯虾为研究对象,测定了在正常投喂人工颗粒饲料的基础上辅助添加小球藻、刚毛藻饲喂克氏原螯虾的生理活性。结果表明:试验期间添加小球藻(1.0×10^6—1.0×10^7 cells·L^-1)、刚毛藻(0.06—0.08 g·L^-1)对克氏原螯虾的生长与存活率均无显著影响(P>0.05),但肌肉超氧化物歧化酶(SOD)和肝胰脏酸性磷酸酶(ACP)的活性显著降低(P<0.05);机体的血细胞密度显著增加(P<0.05),外骨骼和肌肉中虾青素的含量极显著增加(P<0.01);单独添加刚毛藻肌肉虾青素含量也显著提高(P<0.05),血清、肝胰脏和肌肉碱性磷酸酶(AKP)的活性极显著提高(P<0.01),肝胰脏酸性磷酸酶的活性极显著降低(P<0.01)。摄食小球藻和刚毛藻对于克氏原螯虾的抗逆活性和免疫能力具有促进作用,养殖水体中适度添加小球藻和刚毛藻有助于克氏原螯虾的健康与活力

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

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^