摘要：The objective of steganography is to hide message securely in cover objects for secret *** to design a secure steganographic algorithm is still major challenge in this re-search *** this letter,developing secure steganography is formulated as solving a constrained IP(Integer Programming) problem,which takes the relative entropy of cover and stego distributions as the objective ***,a novel method is introduced based on BPSO(Binary Particle Swarm Optimization) for achieving the optimal solution of this programming *** results show that the proposed method can achieve excellent performance on preserving neighboring co-occurrence features for JPEG steganography.

摘要：流感病毒和新型冠状病毒(SARS-CoV-2)是近年来频繁引发呼吸道疾病的主要病原,其引起的黏膜免疫应答对于病毒的控制和清除至关重要.目前对于SARS-CoV-2感染后肺部黏膜免疫应答的具体调控机制及其与流感感染的区别尚不清楚我们通过原位杂交-多重免疫荧光染色技术及空间转录组学揭示了流感病毒和SARS-CoV-2感染过程中局部免疫应答的动态变化过程,并发现相比于流感病毒感染,SARS-CoV-2感染早期肺部黏膜会更加快速地形成诱导性支气管相关淋巴组织(iBALT)结构并活化B1细胞产生较高水平IgM和IgA,可能在抗病毒感染及iBALT的形成中发挥重要作用.同时,SARS-CoV-2及表达其S蛋白的假病毒感染均能够促进小鼠和人的B1细胞的活化.将表达S蛋白的腺病毒疫苗AdC7-S对小鼠进行免疫后,可以成功诱导出包含B1细胞的iBALT,并在病毒感染中发挥保护作用.本研究揭示了呼吸道病毒引起的肺脏黏膜免疫动态应答过程,并阐明了SARS-CoV-2感染早期B1细胞的活化特点及免疫保护作用,为揭示新发呼吸道传染病的保护性应答机制及疫苗设计提供了理论基础.

摘要：The preliminary assessment of progeny test in a seed orchard of Eucalyptus globulus *** at Yipinglang State Farm of Yunnan Province in China was *** trial was composed of 21 replications,with 2 trees on each plot,15 plots in each incomplete block,and 18 incomplete blocks in each replication,laid out in a α-design of 270 open-pollinated *** families were of three categories (natural populations,local land race and seed orchard).They were further subdivided into 11 *** data from an assessment of growth,stem form and other characteristics of the young trees after being planted 2 years were *** are as follows:the different categories differed significantly in their growth,with the families from seed orchards being the *** also differed significantly in their *** families from the regions of Westem Victoria,Eastern Victoria and all three seed orchards were better than *** tamilies from Yunnan had the best frost tolerant and its survival was the *** growth,stem form and fungal tolerance,the families from Yunnan were similar to that from Southern Tasmania and Eastem ***-tree plots were strongly recommended over singletree plot designs for large-scale progeny trials.

摘要：自2019年12月新型冠状病毒肺炎(Coronavirus Disease 2019, COVID-19)暴发以来,已有大量相关临床研究完成注册或已启动。然而,不同研究间临床结局指标存在显著的异质性,同时一些不关键的指标会造成研究资源的浪费。本研究旨在构建COVID-19临床试验核心结局指标集(core outcome set, COS),为相关临床研究方案设计、开展和证据转化提供参考。本研究的实施参照《有效性试验核心结局指标(COMET)手册》(1.0版),研究组成员包括呼吸系统和危重医学、中医学、循证医学、临床药理学、统计学专家以及医学杂志编辑等。通过检索临床试验注册网站(***和***)中COVID-19相关临床研究方案,提取方案中的结局指标,形成指标池。78个COVID-19临床试验方案纳入研究,收集结局指标259个,合并规范后确定132个结局指标,涉及7个指标域。经遴选,形成了包括58个结局指标在内的初始指标清单。经过两轮德尔菲调查和一轮共识会议,最终确立针对COVID-19不同临床分型的核心指标集(COS-COVID)。COS-COVID包括1个轻型指标(病毒核酸检测转阴时间)、4个普通型指标(住院时间、复合事件发生率、临床症状积分和病毒核酸检测转阴时间)、5个重型指标(复合事件发生率、住院时间、PaO2/FiO2、机械通气时间和病毒核酸检测转阴时间)、1个危重型指标(全因死亡率)及1个康复期指标(肺功能)。COS-COVID作为目前临床评价COVID-19干预效果最具临床价值及操作性的指标集合,对证据评估和决策具有重要意义。随着对疾病认知的不断深入和COS-COVID应用的反馈,课题组将对本核心指标集进行进一步完善并更新。