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The reference genome of seed hemp(Cannabis sativa)provides new insights into fatty acid and vitamin E synthesis

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Plant Communications 2024年第1期5卷 12-15页

作者： Huawei Wei Zuqing Yang Sylvain Niyitanga Aifen Tao Jiantang Xu Pingping Fang Lihui lin Liemei Zhang Jianmin Qi Ray Ming Liwu Zhang Key Laboratory of Ministry of Education for Genetic Breeding and Multiple Utilization of Crops/Key Laboratory of Ministry of Agriculture and Rural Affairs for Biological Breeding of Fujian and Taiwan Crops Fujian Agriculture and Forestry UniversityFuzhou 350002China Fujian Public Platform for Germplasm Resources of Bast Fiber Crops/Fujian Provincial Key Laboratory of Crop Breeding by Design Fujian Agriculture and Forestry UniversityFuzhou 350002China Center for Genomics and Biotechnology Fujian Agriculture and Forestry UniversityFuzhou 350002China

Dear Editor,hemp(Cannabis sativa L.)(2n=20)is an annual herb of the Cannabaceae family,mostly dioecious and occasionally monoecious(Van et al.,2011;Long et al.,2017).A major source of food,textiles,and oilseed,it is believed to have originated in central Asia and spread rapidly throughout Asia and Europe(Andre et al.,2016;Braich et al.,2019;Gao et al.,2020).Depending on its usage and cannabinoid content,cannabis is classified as fiber type(hemp or industrial hemp)or drug type(medicinal cannabis or marijuana)(Struik et al.,2000;Hurgobin et al.,2021).As a type of industrial hemp,seed hemp is widely used to produce seed oil,but we still know little about the genetic basis of its fatty acid and vitamin E synthesis.

关键词： synthesis. fiber synthesis

医疗机构卫生人员结核分枝杆菌感染的危险因素研究

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中华劳动卫生职业病杂志 2024年第2期42卷 96-101页

作者：何琳戚巍唐诗邈曹宏伟蒋轶文辽宁省疾病预防控制中心结核病预防控制所沈阳110000

目的了解结核病定点医疗机构卫生人员结核分枝杆菌的感染状况,探讨引发感染的风险因素。方法 2021年9月至2022年6月通过整群分层抽样的方法对4家结核病定点医疗机构相关科室的卫生人员进行问卷调查,内容包含医疗机构院内感染控制措施的... 详细信息

目的了解结核病定点医疗机构卫生人员结核分枝杆菌的感染状况,探讨引发感染的风险因素。方法 2021年9月至2022年6月通过整群分层抽样的方法对4家结核病定点医疗机构相关科室的卫生人员进行问卷调查,内容包含医疗机构院内感染控制措施的实施、医务人员结核分枝杆菌职业暴露情况,同时行外周血γ-干扰素释放试验(interferon gamma release assays,IGRAs)和肺部影像学检查,判定结核分枝杆菌感染情况。将单因素分析有统计学意义的因素纳入多因素logistic回归,分析结核分枝杆菌感染的风险因素。结果共有657人完成肺部影像学检查和调查问卷,其中654人行外周血IGRAs检测,结核病潜伏感染率为39.45%(258/654)。单因素分析显示,基本情况方面年龄、性别、婚姻状况、经济收入、职业类别、职称等级、工龄等变量卫生人员结核病潜伏感染情况差异均有统计学意义(P<0.05);个人健康状况方面本人结核病史、直系亲属结核病史、既往接受结核菌素皮肤试验等的卫生人员结核病潜伏感染情况分布差异均有统计学意义(P<0.05)。多因素分析显示,共有4种与结核病相关的风险因素,分别为职称等级(X1)、从事与肺结核相关工作年限(X2)、结核病史(X3)和既往结核菌素皮肤试验情况(X4),则卫生人员发生结核病概率的回归方程为y=-1.920+0.246X1+0.046X2+1.231X3+0.478X4。结论结核病定点医疗机构卫生人员结核病潜伏感染率较高,应加强感染控制工作的管理,开展定期筛查,提升卫生人员的自我防护意识,降低卫生人员的结核分枝杆菌暴露及感染风险。

关键词：职业暴露结核病卫生人员潜伏性感染潜伏性结核病感染控制

OsPPG encodes a pseudouridine-5'-phosphate glycosidase and regulates rice spikelet development

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The Crop Journal 2024年第3期12卷 698-708页

作者： Rui Chen dagang Tian Yarong lin Jiaqing Huang Qinqin Yang Yupei Li Huaqing Liu Shaohua Yang Jingyang Chen Shufen Zhou Feng Wang Shubiao Zhang Key Laboratory of Genetics Breeding and Multiple Utilization of CropsMinistry of Education/Key Laboratory of Biological Breeding for Fujian and Taiwan CropsMinistry of Agriculture and Rural AffairsFujian Agriculture and Forestry UniversityFuzhou 350002FujianChina Fujian Key Laboratory of Genetic Engineering for Agriculture Biotechnology Research InstituteFujian Academy of Agricultural SciencesFuzhou 350003FujianChina Institute of Resources Environment and Soil FertilizerFujian Academy of Agricultural SciencesFuzhou 350013FujianChina

Florets are the basic structural units of spikelets,and their morphogenesis determines the yield and quality of rice ***,whether and how pseudouridine-5’-phosphate glycosidase participates in rice spikelet development remains an open *** this study,we identified a novel gene,OsPPG,which encodes a peroxisome-localized pseudouridine-5’-phosphate glycosidase and regulates the development of rice *** mutants exhibited abnormal sterile lemma,lemma,palea,lodicule,stamens,and pistils;male sterility;shorter panicles;and reduced plant *** was found to regulate several OsMADS genes,thereby affecting the morphogenesis of rice ***,metabolomics revealed that the OsPPG gene was involved in the decomposition of pseudouridine via the pyrimidine metabolism pathway and may affect the jasmonic acid signaling *** results suggest that OsPPG is a key regulator of rice spikelet development.

关键词： OsPPG Reproductive regulation Spikelet development Rice

黄土高原退耕还林(草)前后土壤有机碳密度变化及其对气候变化和人类活动的响应

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环境科学 2024年第8期45卷 4696-4708页

作者：许煜麟赵雅萍赵雨晴杨婉琳郑梦桃王誉晓刘爽何静苏高杰王珺韩新辉杨改河任成杰西北农林科技大学农学院陕西省循环农业工程技术研究中心杨凌712100

准确评估黄土高原地区退耕还林前后土壤有机碳储量(SOCS)的变化,探究其时空分布及影响因素之间的关系,对区域循环发展以及生态保护政策的制定具有重要的参考意义.基于黄土高原退耕还林(草)前后(2001~2020年)的气候、人类活动及土壤表层(... 详细信息

准确评估黄土高原地区退耕还林前后土壤有机碳储量(SOCS)的变化,探究其时空分布及影响因素之间的关系,对区域循环发展以及生态保护政策的制定具有重要的参考意义.基于黄土高原退耕还林(草)前后(2001~2020年)的气候、人类活动及土壤表层(0~20 cm)和深层(0~100 cm)有机碳密度数据,采用变化趋势分析、克里格差值、方差分解分析等方法,从不同时空尺度上研究了土壤有机碳密度(SOCD)的变化特征及对气候和人为因素变化的相对响应.结果表明:①退耕还林前后全区域表层SOCS增加了833.87万t;深层SOCS增加了1160.02万t.②各生物气候分区中,Ⅰ(半湿润森林区)、Ⅱ(半湿润半干旱林草区)和Ⅲ(半干旱典型草地区)全域平均SOCD呈显著增加,而在Ⅳ(干旱半干旱荒漠草地区)和Ⅴ(干旱荒漠区)中降低.③不同生态系统平均表层SOCS增量排序为:耕地>草地>林地>灌木>裸地及稀疏植被;深层土壤增量排序为:草地>耕地>林地>灌木>裸地及稀疏植被.④气候因子始终是SOCD变化最重要的驱动因素;年均温和降水量与SOCD变化呈显著正相关.研究结果可为区域生态管理和土地利用政策制定提供数据支撑,以促进黄土高原地区生态环境高质量发展.

关键词：黄土高原土壤碳储量土壤碳密度气候人类活动

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结合矩阵补全的宽度协同过滤推荐算法

智能系统学报 2024年第2期19卷 299-306页

作者：史加荣何攀西安建筑科技大学理学院陕西西安710055

协同过滤是推荐系统中最经典的方法之一,能够满足人们对个性化推荐任务的需求,但许多协同过滤算法在面对评分数据稀疏性问题时推荐效果不佳。为解决此问题,提出一种结合矩阵补全的宽度协同过滤推荐算法。先使用矩阵补全技术对用户项目... 详细信息

协同过滤是推荐系统中最经典的方法之一,能够满足人们对个性化推荐任务的需求,但许多协同过滤算法在面对评分数据稀疏性问题时推荐效果不佳。为解决此问题,提出一种结合矩阵补全的宽度协同过滤推荐算法。先使用矩阵补全技术对用户项目评分矩阵进行补全,再利用补全后的矩阵对已评分的用户和项目分别寻找其近邻项,进而构造用户与项目的评分协同向量,最后使用宽度学习系统来构建用户项目与评分之间的复杂的非线性关系。在MovieLens和filmtrust数据集上对所提出算法的有效性进行检验。试验结果表明,与当前最先进的方法相比,该方法能够有效地缓解数据稀疏性问题,具有较低的计算复杂度,在一定程度上提升了推荐系统的性能。

关键词：推荐系统宽度学习系统矩阵补全宽度协同过滤协同过滤深度矩阵分解数据稀疏性深度学习

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互联网行政许可事项设定的逻辑与进路

治理研究 2024年第1期40卷 141-157,160页

作者：林华金麟中国政法大学习近平法治思想研究院中国政法大学法学院

我国互联网行政许可事项的设定面临着法律规范层级与许可事项重要性不匹配、法律规范稳定性与互联网高速发展不相容、许可事项碎片化与互联网有效治理不和谐等多重困境。互联网行政许可事项的设定需回应“因何设定”的实质逻辑和“如何... 详细信息

我国互联网行政许可事项的设定面临着法律规范层级与许可事项重要性不匹配、法律规范稳定性与互联网高速发展不相容、许可事项碎片化与互联网有效治理不和谐等多重困境。互联网行政许可事项的设定需回应“因何设定”的实质逻辑和“如何设定”的形式逻辑。在实质逻辑面向上,立法者需要区分互联网基础服务领域的许可事项和“互联网+”领域的许可事项,进行功能分析的二阶判断。在形式逻辑面向上,互联网行政许可事项存在“特有型”和“交叉型”两类方式。在“辅助性原则”和回应型法的指引下,互联网基础服务领域的许可事项和“互联网+”领域的许可事项需要分别匹配“特有型”和“交叉型”的设定方式,保证许可设定权限合法和事项重要性程度匹配,遵循“同一性原则”合理选择法条类型,以实现实体领域行政许可事项与互联网行政许可事项的体系衔接。

关键词：互联网行政许可行政许可事项行政许可设定互联网法

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Secure and efficient covert communication for blockchain-integrated SAGINs

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Security and Safety

Security and Safety 2024年第2期 25-42页

作者： Weijia Li Yuan Zhang Xinyu he Yaqing Song School of Computer Science and Engineering (School of Cyber Security) University of Electronic Science and Technology of China

Blockchain has brought great potential in improving Space-Air-Ground Integrated Networks(SAGINs) in terms of security and efficiency. In blockchain-integrated SAGINs, many applications and services inherently require both the communication contents and communication behaviors to be secure against eavesdroppers, in which a covert communication algorithm is always deployed as a fundamental communication ***, existing covert communication schemes suffer from critical problems. On the one hand, they require a sender to locally maintain a cryptographic key for a long period of time, which is very costly and inefficient to renew which means renewing the secret key. On the other hand, the ciphertext of covertly sent data would explicitly appear in the network,and thereby the schemes are vulnerable to secret key breach. In this paper, we propose a secure and efficient covert communication scheme for blockchain-integrated SAGINs, dubbed CC-BSAGINs, to free the sender from maintaining secret keys. The key technique is to map the covertly sent data to some transactions on the underlying blockchain in a secure and efficient way; the mapping information is sent via a covert communication algorithm. Such a two-step mechanism releases the sender from key management and does not require the ciphertext to be communicated. We provide formal security proofs and conduct a comprehensive performance evaluation, which demonstrates the security and efficiency of CC-BSAGINs.

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Mixed-ownership Reform:Private Firms’Role in Targeted Poverty Alleviation-A Perspective on Resource Complementarity and Check&Balance

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China Economist 2024年第5期19卷 25-47页

作者： Ding Hui he Dongxin Jiang Fuwei Zhang Zhining School of Finance the Central University of Finance and Economics(CUFE)BeijingChina School of Economics Xiamen UniversityXiamenChina Wang Yanan Institute for Studies in Economics(WISE) Xiamen University

Targeted poverty alleviation(TPA)serves as a winning formula for fighting poverty and has generated valuable experiences for achieving common *** mixed-ownership reform has enhanced corporate economic ***,further testing is required to assess whether enterprises contribute to the improvement of distribution by participating in *** A-share-listed private enterprises between 2016 and 2021 as research samples,we conducted an investigation into the extent and manner in which the mixed-ownership reform contributes to *** research reveals that a higher proportion of state capital equity participation is correlated with a greater level of private enterprises’contribution to *** indicates that the mixed-ownership reform is beneficial for prompting private enterprises to shoulder responsibilities for building a society of common *** shown by the mechanism test,state capital equity participation encourages private enterprises to contribute to TPA primarily by alleviating corporate financing constraints through the resource complementarity *** contrast,the check&balance effect of promoting corporate poverty alleviation by mitigating the principal-agent problem has not yet been significantly *** the poverty alleviation model,state capital equity participation prompts private enterprises to contribute to TPA through industrial development,educational investment,and environmental protection,emphasizing a combination of providing external assistance and cultivating endogenous development *** terms of TPA regions,state capital equity participation plays a significant role in supporting economically less-developed regions,regions with high unemployment rates,and central and western *** paper provides new empirical evidence for deepening mixed-ownership reforms and advancing common prosperity.

关键词： Mixed ownership TPA state capital resource complementarity check&balance

Tunable hexagonal boron nitride topological optical delay line in the visible region

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Chinese Optics Letters 2024年第5期22卷 124-130页

作者：费宏明武敏林瀚杨毅彪肖连团 College of Physics Taiyuan University of TechnologyTaiyuan 030024China College of Information Engineering Shanxi Vocational University of Engineering Science and TechnologyJinzhong 030619China College of Science RMIT UniversityMelbourneVictoria 3000Australia College of Electronic Information and Optical Engineering Taiyuan University of TechnologyTaiyuan 030024China

Tunability,ultracompact design,high group index,low loss,and broad bandwidth are desired properties for integrated optical delay lines(ODLs).However,those properties are challenging to achieve simultaneously in the visible *** paper proposes a tunable hexagonal boron nitride topological optical delay line(ODL)in the visible region based on valley photonic *** topological edge state from the beard-type boundary allows the achievement of an ultralow group velocity close to zero,which results in a large group index of 629 at 645 ***,we demonstrate tuning of the slow-light wavelength and optical delay times with electrically tunable liquid crystals by applying external *** device has an ultracompact size of 5μm×2.7μm with an optical delay distance of 25a(a is the lattice constant)and a delay time of 12 *** design can provide a new possibility for designing ODLs working in the visible region for optical communication and quantum computing systems.

关键词： valley photonic crystal topological edge states optical delay lines