The Yangtze River is the mother river of China.To promote the aquatic ecosystem protection of the great river,the Project of Yangtze Fisheries Resources and Environment Investigation(2017-2021)supported by the Ministr...The Yangtze River is the mother river of China.To promote the aquatic ecosystem protection of the great river,the Project of Yangtze Fisheries Resources and Environment Investigation(2017-2021)supported by the Ministry of Agriculture and Rural Affairs,P.R.China carried out by 24 institutes and universities that located in the Yangtze River basin surveys the status of(1)fish species composition and spatial distribution,(2)current fish abundance,(3)endangered fishes,(4)Yangtze finless porpoise,(5)aquatic eco-environments,(6)water-level fluctuation areas,(7)capture fisheries and recreational fisheries of the Yangtze River mainstream and 10 of its main tributaries,including Yalong River,Heng River,Min River(including Dadu River),Chishui River,Tuo River,Jialing River,Wu River,Han River,Dongting Lake and Poyang Lake.The results showed that there were 443 fish species(belonging to 163 genus,37 families,and 18 orders)before 2017,but only 323 fish species(including 15 new recorded exotic species)were recorded in the project of 2017-2021.Among them,Cyprinus carpio,Carassius auratus,Hypophthalmichthys molitrix,Pelteobagrus fulvidraco,Coilia brachygnathus,Silurus asotus,Saurogobio dabryi,Ctenopharyngodon idellus,Pelteobagrus nitidus,Hemiculter leucisculus,Siniperca chuatsi,Coreius heterodon,Culter alburnus,Parabramis pekinensis,and Aristichthys nobilis were the dominant species across the whole Yangtze River system.It is estimated that there were 886 million individuals weighing 124.8 million kg,merely equivalent to 27.3%of the resources in 1950s,30.9%of the resources in 1960s,or 58.7%of the resources in 1980s.In the new list of protected fishes that recorded in the Yangtze River system,only 15 of 29 were collected in this project of 2017-2021.Psephurus gladius has been affirmed to be Extinct by International Union for Conservation of Nature(IUCN).The wild individuals of Tenualosa reevesii and Luciobrama macrocephalus have disappeared for many years and maybe have been extinct already.Acipenser dabryanus has been affirmed to展开更多
Plant architecture is an important factor for crop production. Some members of microRNA156 (miR156) and their target genes SQUAMOSA Promoter-Binding Protein-Like (SPL) were identified to play essential roles in the es...Plant architecture is an important factor for crop production. Some members of microRNA156 (miR156) and their target genes SQUAMOSA Promoter-Binding Protein-Like (SPL) were identified to play essential roles in the establishment of plant architecture. However, the roles and regulation of miR156 is not well understood yet. Here, we identified a T-DNA insertion mutant Osmtd1 (Oryza sativa multi-tillering and dwarf mutant). Osmtd1 produced more tillers and displayed short stature phenotype. We determined that the dramatic morphological changes were caused by a single T-DNA insertion in Osmtd1. Further analysis revealed that the T-DNA insertion was located in the gene Os08g34258 encoding a putative inhibitor I family protein. Os08g34258 was knocked out and OsmiR156f was significantly upregulated in Osmtd1. Overexpression of Os08g34258 in Osmtd1 complemented the defects of the mutant architecture, while overexpression of OsmiR156f in wild-type rice phenocopied Osmtd1. We showed that the expression of OsSPL3, OsSPL12, and OsSPL14 were significantly downregulated in Osmtd1 or OsmiR156f overexpressed lines, indicating that OsSPL3, OsSPL12, and OsSPL14 were possibly direct target genes of OsmiR156f. Our results suggested that OsmiR156f controlled plant architecture by mediating plant stature and tiller outgrowth and may be regulated by an unknown protease inhibitor I family protein.展开更多
Particle distribution estimation is an important issue in medical diagnosis. In particular, photon scattering in some medical devices extremely degrades image quality and causes measurement inaccuracy. The Monte Carlo...Particle distribution estimation is an important issue in medical diagnosis. In particular, photon scattering in some medical devices extremely degrades image quality and causes measurement inaccuracy. The Monte Carlo(MC) algorithm is regarded as the most accurate particle estimation approach but is still time-consuming, even with graphic processing unit(GPU) acceleration. The goal of this work is to develop an automatic scatter estimation framework for high-efficiency photon distribution estimation. Specifically, a GPU-based MC simulation initially yields a raw scatter signal with a low photon number to hasten scatter generation. In the proposed method, assume that the scatter signal follows Poisson distribution, where an optimization objective function fused with sparse feature penalty is modeled. Then, an over-relaxation algorithm is deduced mathematically to solve this objective function. For optimizing the parameters in the over-relaxation algorithm, the deep Q-network in the deep reinforcement learning scheme is built to intelligently interact with the over-relaxation algorithm to accurately and rapidly estimate a scatter signal with the large range of photon numbers.Experimental results demonstrated that our proposed framework can achieve superior performance with structural similarity >0.94, peak signal-to-noise ratio >26.55 d B, and relative absolute error <5.62%, and the lowest computation time for one scatter image generation can be within 2 s.展开更多
目的基于急性缺血性脑卒中患者发病就医轨迹视角分析并阐明急性缺血性脑卒中患者就医延迟的概念内涵,为相关研究提供理论依据。方法运用Rodgers演化概念分析法分析Cochrane Library、CINAHL、PubMed、Embase、Web of Science、Psyc INF...目的基于急性缺血性脑卒中患者发病就医轨迹视角分析并阐明急性缺血性脑卒中患者就医延迟的概念内涵,为相关研究提供理论依据。方法运用Rodgers演化概念分析法分析Cochrane Library、CINAHL、PubMed、Embase、Web of Science、Psyc INFO、中国知网、万方数据知识服务平台、维普中文科技期刊数据库等建库至2023年5月6日关于急性缺血性脑卒中患者就医延迟的相关文献。结果急性缺血性脑卒中患者发病就医过程经历了院前和院内两个阶段,就医延迟的相关因素包括院前延迟、院内延迟两部分,院前延迟分为患者延迟和转运延迟,患者延迟的相关因素有知识缺乏、社会支持不足、经济条件制约、身心感知差异;转运延迟的相关因素有交通堵塞、就医方式不当、首诊医院、紧急医疗服务反应不良;院内延迟的相关因素有医疗机构诊疗水平、医疗机构管理制度、医患关系等。就医延迟的4个概念属性即院前延迟严重、治疗时间不足、不良预后、病耻感强烈。结论界定急性缺血性脑卒中患者就医延迟的概念,有助于医护人员开展相关理论研究,编制相关适用的测评量表,实施针对性干预措施,降低急性缺血性脑卒中患者就医延迟的发生率,改善患者预后。展开更多
文摘The Yangtze River is the mother river of China.To promote the aquatic ecosystem protection of the great river,the Project of Yangtze Fisheries Resources and Environment Investigation(2017-2021)supported by the Ministry of Agriculture and Rural Affairs,P.R.China carried out by 24 institutes and universities that located in the Yangtze River basin surveys the status of(1)fish species composition and spatial distribution,(2)current fish abundance,(3)endangered fishes,(4)Yangtze finless porpoise,(5)aquatic eco-environments,(6)water-level fluctuation areas,(7)capture fisheries and recreational fisheries of the Yangtze River mainstream and 10 of its main tributaries,including Yalong River,Heng River,Min River(including Dadu River),Chishui River,Tuo River,Jialing River,Wu River,Han River,Dongting Lake and Poyang Lake.The results showed that there were 443 fish species(belonging to 163 genus,37 families,and 18 orders)before 2017,but only 323 fish species(including 15 new recorded exotic species)were recorded in the project of 2017-2021.Among them,Cyprinus carpio,Carassius auratus,Hypophthalmichthys molitrix,Pelteobagrus fulvidraco,Coilia brachygnathus,Silurus asotus,Saurogobio dabryi,Ctenopharyngodon idellus,Pelteobagrus nitidus,Hemiculter leucisculus,Siniperca chuatsi,Coreius heterodon,Culter alburnus,Parabramis pekinensis,and Aristichthys nobilis were the dominant species across the whole Yangtze River system.It is estimated that there were 886 million individuals weighing 124.8 million kg,merely equivalent to 27.3%of the resources in 1950s,30.9%of the resources in 1960s,or 58.7%of the resources in 1980s.In the new list of protected fishes that recorded in the Yangtze River system,only 15 of 29 were collected in this project of 2017-2021.Psephurus gladius has been affirmed to be Extinct by International Union for Conservation of Nature(IUCN).The wild individuals of Tenualosa reevesii and Luciobrama macrocephalus have disappeared for many years and maybe have been extinct already.Acipenser dabryanus has been affirmed to
基金supported by the National Natural Science Foundation of China (no. 91317312 and 91117006)Open Foundation Project for Hunan Provincial Higher Institutional Innovation Platform (no. 09K052)Hunan Provincial Key Laboratory for Crop Germplasm Innovation and Utilization (no. 12KFXM05)
文摘Plant architecture is an important factor for crop production. Some members of microRNA156 (miR156) and their target genes SQUAMOSA Promoter-Binding Protein-Like (SPL) were identified to play essential roles in the establishment of plant architecture. However, the roles and regulation of miR156 is not well understood yet. Here, we identified a T-DNA insertion mutant Osmtd1 (Oryza sativa multi-tillering and dwarf mutant). Osmtd1 produced more tillers and displayed short stature phenotype. We determined that the dramatic morphological changes were caused by a single T-DNA insertion in Osmtd1. Further analysis revealed that the T-DNA insertion was located in the gene Os08g34258 encoding a putative inhibitor I family protein. Os08g34258 was knocked out and OsmiR156f was significantly upregulated in Osmtd1. Overexpression of Os08g34258 in Osmtd1 complemented the defects of the mutant architecture, while overexpression of OsmiR156f in wild-type rice phenocopied Osmtd1. We showed that the expression of OsSPL3, OsSPL12, and OsSPL14 were significantly downregulated in Osmtd1 or OsmiR156f overexpressed lines, indicating that OsSPL3, OsSPL12, and OsSPL14 were possibly direct target genes of OsmiR156f. Our results suggested that OsmiR156f controlled plant architecture by mediating plant stature and tiller outgrowth and may be regulated by an unknown protease inhibitor I family protein.
基金National Key Research and Development Program of China (2016YFA0202003)National Natural Science Foundation of China (61971463)+1 种基金Ministry of Science and Technology Planning Project of Guangdong (2015B020233002, 2015B020233005)Guangzhou Science and Technology Plan Project (202002030385)。
文摘Particle distribution estimation is an important issue in medical diagnosis. In particular, photon scattering in some medical devices extremely degrades image quality and causes measurement inaccuracy. The Monte Carlo(MC) algorithm is regarded as the most accurate particle estimation approach but is still time-consuming, even with graphic processing unit(GPU) acceleration. The goal of this work is to develop an automatic scatter estimation framework for high-efficiency photon distribution estimation. Specifically, a GPU-based MC simulation initially yields a raw scatter signal with a low photon number to hasten scatter generation. In the proposed method, assume that the scatter signal follows Poisson distribution, where an optimization objective function fused with sparse feature penalty is modeled. Then, an over-relaxation algorithm is deduced mathematically to solve this objective function. For optimizing the parameters in the over-relaxation algorithm, the deep Q-network in the deep reinforcement learning scheme is built to intelligently interact with the over-relaxation algorithm to accurately and rapidly estimate a scatter signal with the large range of photon numbers.Experimental results demonstrated that our proposed framework can achieve superior performance with structural similarity >0.94, peak signal-to-noise ratio >26.55 d B, and relative absolute error <5.62%, and the lowest computation time for one scatter image generation can be within 2 s.
文摘目的基于急性缺血性脑卒中患者发病就医轨迹视角分析并阐明急性缺血性脑卒中患者就医延迟的概念内涵,为相关研究提供理论依据。方法运用Rodgers演化概念分析法分析Cochrane Library、CINAHL、PubMed、Embase、Web of Science、Psyc INFO、中国知网、万方数据知识服务平台、维普中文科技期刊数据库等建库至2023年5月6日关于急性缺血性脑卒中患者就医延迟的相关文献。结果急性缺血性脑卒中患者发病就医过程经历了院前和院内两个阶段,就医延迟的相关因素包括院前延迟、院内延迟两部分,院前延迟分为患者延迟和转运延迟,患者延迟的相关因素有知识缺乏、社会支持不足、经济条件制约、身心感知差异;转运延迟的相关因素有交通堵塞、就医方式不当、首诊医院、紧急医疗服务反应不良;院内延迟的相关因素有医疗机构诊疗水平、医疗机构管理制度、医患关系等。就医延迟的4个概念属性即院前延迟严重、治疗时间不足、不良预后、病耻感强烈。结论界定急性缺血性脑卒中患者就医延迟的概念,有助于医护人员开展相关理论研究,编制相关适用的测评量表,实施针对性干预措施,降低急性缺血性脑卒中患者就医延迟的发生率,改善患者预后。
