检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

紫菜薹叶绿体全基因组序列及其系统发育分析

西北农业学报 2024年第8期33卷 1483-1494页

作者：王传之周贤玉李扬眉肖婉钰王雨凤任海龙宿州学院生物与食品工程学院安徽宿州234000 广州市农业科学研究院广州510308 广东省农业科学院作物研究所/广东省农作物遗传改良重点实验室广州510640

紫菜薹(Brassica rapa ***)是十字花科芸薹属白菜亚种中的一个变种,通过Illumina高通量测序平台,对其叶绿体基因组进行测序、组装和注释。结果表明,紫菜薹叶绿体基因组为典型的四分环状结构,大小为153483 bp,GC含量为36.36%,由长度为832... 详细信息

紫菜薹(Brassica rapa ***)是十字花科芸薹属白菜亚种中的一个变种,通过Illumina高通量测序平台,对其叶绿体基因组进行测序、组装和注释。结果表明,紫菜薹叶绿体基因组为典型的四分环状结构,大小为153483 bp,GC含量为36.36%,由长度为83282 bp的大单拷贝区(LSC)、17775 bp的小单拷贝区(SSC)和1对各26213 bp的反向重复区(IRa/IRb)组成。基因组注释共得到132个基因,包括:87个蛋白编码基因,37个tRNA和8个rRNA。共鉴定到313个简单重复序列(SSR)和37个散在重复序列。密码子偏好性分析发现存在偏好使用A/U碱基结尾的现象。边界分析和序列变异分析显示,芸薹属叶绿体基因组非常保守,其中SSC区差异性最大,变异程度最高,IR区差异性最小,最为保守。基于叶绿体基因组序列的系统发育分析表明,紫菜薹在分类上与白菜的其他变种在一个小分支中。研究结果可为芸薹属植物,特别是白菜种的分类学、系统学和生物地理学研究提供参考。

关键词：白菜紫菜薹叶绿体基因组系统发育分析

维普期刊数据库博看期刊

紫菜薹线粒体基因组SSR分布特征的比较分析

在线全文

学校读者我要写书评

暂无评论

福建农业学报 2024年第1期39卷 49-56页

作者：肖婉钰周贤玉任海龙黄红弟郑岩松张晶许东林广州市农业科学研究院广东广州510308 广东省农业科学院作物研究所/广东省农作物遗传改良重点实验室广东广州510640 广东省良种引进服务公司广东广州510091

【目的】分析紫菜薹(Brassica rapa ***)线粒体基因组SSR序列的分布特征,并与芸薹属主要物种进行比较,为紫菜薹SSR分子标记的开发及遗传进化研究提供参考。【方法】利用MISA软件对紫菜薹及芸薹属6个基本种(包括白菜3个变种)的线粒体基... 详细信息

【目的】分析紫菜薹(Brassica rapa ***)线粒体基因组SSR序列的分布特征,并与芸薹属主要物种进行比较,为紫菜薹SSR分子标记的开发及遗传进化研究提供参考。【方法】利用MISA软件对紫菜薹及芸薹属6个基本种(包括白菜3个变种)的线粒体基因组进行搜索,并对搜索到的SSR序列分布特征进行比较分析。【结果】在紫菜薹及芸薹属6个基本种(包括白菜3个变种)的线粒体基因组中,分别筛选到168、170、167、168、180、280、185、165、179个完整的SSR序列,相对密度分别为764、774、760、764、775、777、721、744、771个·Mb-1,SSR序列的总长度分别为1562、1577、1547、1562、1664、2564、1722、1524、1646 bp,占各自线粒体基因组序列总长度的比例分别为0.71%、0.72%、0.70%、0.71%、0.72%、0.71%、0.67%、0.69%和0.71%。在1~6个不同核苷酸重复单元中,紫菜薹及芸薹属6个基本种的SSR序列均是单核苷酸重复单元最多,然后依次是二核苷酸、四核苷酸、三核苷酸、五核苷酸,均未发现六核苷酸重复单元。其中,A/T、AG/CT、AT/AT和C/G是芸薹属线粒体基因组共有的常见重复单元类型。【结论】紫菜薹线粒体基因组大小为219779 bp,共筛选出168个SSR分子标记,相对密度为764个·Mb-1,平均长度为9 bp,以单核苷酸重复单元的数量最多,其次为二、四核苷酸重复单元类型,具有较大的多态性标记开发潜力。

关键词：紫菜薹芸薹属线粒体 SSR

Consensus on the diagnosis and treatment of blepharoptosis

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Plastic and Reconstructive Surgery 2021年第3期3卷 167-172页

作者： xianyu zhou Fei Liu Yuanyuan Du Dongmei Li Tianxiang Ouyang Jun Yang Department of Plastic and Reconstructive Surgery Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai 20001China Shanghai Beaucare Clinics Shanghai 200052China Beijing Tongren Eye Center Beijing Tongren HospitalCapital Medical UniversityBeijing 100005China Department of Plastic and Reconstructive Surgery Xinhua HospitalShanghai Jiao Tong University School of MedicineShanghai 200092China

Blepharoptosis is a symptom that is commonly observed in *** presents with drooping of the upper eyelid and an asymmetric appearance of the *** can occur because of various *** left untreated,severe congenital blepharoptosis may impair visual *** surgical approach largely depends on the severity of blepharoptosis,Bell’s phenomenon,and surgical ***,it is intricate and difficult to achieve satisfactory symmetry and avoid *** to the complexity involved and discrepancies in treatment,we planned to arrive at a consensus on the diagnosis and correction of blepharoptosis among Chinese plastic surgeons and ophthalmologists,aiming to establish more standardized treatments and cause less harm to patients.

关键词： Blepharoptosis Correction Complication Consensus Diagnosis Treatment

Light-triggered fluorochromic cholesteric liquid crystal elastomer with hydrogen-bonded fluorescent switch: dualmodal-switchable circularly polarized luminescence

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第8期67卷 2719-2727页

作者： Siyang Lin Tianqi Ren xianyu Meng Wenxin Kang Jinbao Guo Key Laboratory of Carbon Fibers and Functional Polymers Ministry of EducationCollege of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Solid materials with dynamically tunable circularly polarized luminescence(CPL) feature higher security levels and devicefriendly characteristics, showing great superiority in the field of information technology and anti-counterfeiting. To address the limited photoisomerization of fluorescent photoswitch in CPL-active solid materials, here a cholesteric liquid crystal elastomer(CLCE) containing a hydrogen-bonded(H-bonded) polymerizable fluorescent switch AHBA-PSD is prepared. Owing to the good flexibility and low glass-transition temperature of CLCE, AHBA-PSD shows a fast and fully reversible photocyclization/cycloreversion with fluorochromic behavior in CLCE. Further, by controlling the spectral overlapping area between the emission and reflection bands, the CLCE exhibits a strong CPL with a g_(lum) value of up to 0.76 accompanied by a reversible phototunable CPL signal. Meanwhile, the H-bond helps to stabilize the mechanical property, and the force-induced switching-off of CPL signal could be achieved due to the destroyed helical structures by external force. Finally, an automatically-recognized identification card with abundant chiroptical information is demonstrated.

关键词： cholesteric liquid crystal elastomer circularly polarized luminescence fluorescent photoswitch diarylethene photoismerization

Joint Optimization for on-Demand Deployment of UAVs and Spectrum Allocation in UAVs-Assisted Communication

在线全文

学校读者我要写书评

暂无评论

China Communications 2024年第7期21卷 278-290页

作者： Chen Yong Liao Naiwen WangWei Zhang xianyu Zhang Yu College of Communication Engineering Army Engineering University of PLANanjing 210007China The Sixty-Third Research Institute National University of Defense TechnologyNanjing 210007China

To improve the efficiency and fairness of the spectrum allocation for ground communication assisted by unmanned aerial vehicles(UAVs),a joint optimization method for on-demand deployment and spectrum allocation of UAVs is proposed,which is modeled as a mixed-integer non-convex optimization problem(MINCOP).An algorithm to estimate the minimum number of required UAVs is firstly proposed based on the pre-estimation and simulated *** MINCOP is then decomposed into three sub-problems based on the block coordinate descent method,including the spectrum allocation of UAVs,the association between UAVs and ground users,and the deployment of ***,the optimal spectrum allocation is derived based on the interference mitigation and channel *** association between UAVs and ground users is optimized based on local iterated optimization.A particle-based optimization algorithm is proposed to resolve the subproblem of the UAVs *** results show that the proposed method could effectively improve the minimum transmission rate of UAVs as well as user fairness of spectrum allocation.

关键词： block coordinate descent method on-demand deployment spectrum allocation UAVs-assisted Communication

Spatiotemporal Evaluation and Future Projection of Diurnal Temperature Range over the Tibetan Plateau in CMIP6 Models

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2024年第11期41卷 2245-2258页

作者： Suguo ZHANG Qin HU Xianhong MENG Yaqiong LÜ xianyu YANG School of Atmospheric Sciences/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information TechnologyChengdu 610225China Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 730000China Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China School of Atmospheric Sciences Sun Yat-sen UniversityZhuhai 519082China Earth System Modelling School of Engineering and DesignTechnical University of MunichMunich 85521Germany

The diurnal temperature range(DTR) serves as a vital indicator reflecting both natural climate variability and anthropogenic climate change. This study investigates the historical and projected multitemporal DTR variations over the Tibetan Plateau. It assesses 23 climate models from phase 6 of the Coupled Model Intercomparison Project(CMIP6) using CN05.1 observational data as validation, evaluating their ability to simulate DTR over the Tibetan Plateau. Then, the evolution of DTR over the Tibetan Plateau under different shared socioeconomic pathway(SSP) scenarios for the near,middle, and long term of future projection are analyzed using 11 selected robustly performing models. Key findings reveal:(1) Among the models examined, BCC-CSM2-MR, EC-Earth3, EC-Earth3-CC, EC-Earth3-Veg, EC-Earth3-Veg-LR,FGOALS-g3, FIO-ESM-2-0, GFDL-ESM4, MPI-ESM1-2-HR, MPI-ESM1-2-LR, and INM-CM5-0 exhibit superior integrated simulation capability for capturing the spatiotemporal variability of DTR over the Tibetan Plateau.(2) Projection indicates a slightly increasing trend in DTR on the Tibetan Plateau in the SSP1-2.6 scenario, and decreasing trends in the SSP2-4.5, SSP3-7.0, and SPP5-8.5 scenarios. In certain areas, such as the southeastern edge of the Tibetan Plateau, western hinterland of the Tibetan Plateau, southern Kunlun, and the Qaidam basins, the changes in DTR are relatively large.(3) Notably, the warming rate of maximum temperature under SSP2-4.5, SSP3-7.0, and SPP5-8.5 is slower compared to that of minimum temperature, and it emerges as the primary contributor to the projected decrease in DTR over the Tibetan Plateau in the future.

关键词： Tibetan Plateau CMIP6 models diurnal temperature range model assessment historical period future projection

Large Eddy Simulation of Vertical Structure and Size Density of Deep Layer Clouds

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2024年第8期41卷 1629-1642,1668-1670页

作者： Bangjun CAO xianyu YANG Jun WEN Qin HU Ziyuan ZHU School of Atmospheric Sciences Chengdu University of Information TechnologyChengdu 610225China Institute for Geophysics and Meteorology University of CologneCologne 50923Germany

In a convective scheme featuring a discretized cloud size density, the assumed lateral mixing rate is inversely proportional to the exponential coefficient of plume size. This follows a typical assumption of-1, but it has unveiled inherent uncertainties, especially for deep layer clouds. Addressing this knowledge gap, we conducted comprehensive large eddy simulations and comparative analyses focused on terrestrial regions. Our investigation revealed that cloud formation adheres to the tenets of Bernoulli trials, illustrating power-law scaling that remains consistent regardless of the inherent deep layer cloud attributes existing between cloud size and the number of clouds. This scaling paradigm encompasses liquid, ice, and mixed phases in deep layer clouds. The exponent characterizing the interplay between cloud scale and number in the deep layer cloud, specifically for liquid, ice, or mixed-phase clouds, resembles that of shallow convection,but converges closely to zero. This convergence signifies a propensity for diminished cloud numbers and sizes within deep layer clouds. Notably, the infusion of abundant moisture and the release of latent heat by condensation within the lower atmospheric strata make substantial contributions. However, this role in ice phase formation is limited. The emergence of liquid and ice phases in deep layer clouds is facilitated by the latent heat and influenced by the wind shear inherent in the middle levels. These interrelationships hold potential applications in formulating parameterizations and post-processing model outcomes.

关键词： deep layer cloud cloud spatial structure cloud size density large eddy simulation

Diverse Regulations of Viral and Host Genes in Tomato Germplasms Responding to Tomato Yellow Leaf Curl Virus Inoculation

在线全文

学校读者我要写书评

暂无评论

Agricultural Biotechnology 2023年第3期12卷 55-57,124页

作者： Wanyu XIAO Jianghua HUANG xianyu zhou Hailong REN Jing ZHANG Donglin XU Guangzhou Academy of Agricultural Sciences Guangzhou 510335China College of Agriculture and Biology Zhongkai University of Agriculture and EngineeringGuangzhou 510000China

Tomato yellow leaf curl virus(TYLCV)is the dominating pathogen of tomato yellow leaf curl disease that caused severe loss to tomato production in *** this study,we found that a TYLCV-resistant tomato line drastically reduced the accumulation of viral complementary-sense strand mRNAs but just moderately inhibited that of viral DNA and virion-sense strand ***,two other resistant lines did not have such virus inhibition *** of differential expressed genes showed that the potential host defense-relevant processes varied in different resistant tomatoes,as compared to the susceptible line,suggesting a diversity of tomato TYLCV-resistance mechanisms.

关键词： Tomato yellow leaf curl virus Virus replication Gene expression

Fine classification of rice paddy using multitemporal compact polarimetric SAR C band data based on machine learning methods

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2024年第1期18卷 30-43页

作者： xianyu GUO Junjun YIN Kun LI Jian YANG Huimin ZOU Fukun YANG School of Computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China Department of Electronic Engineering Tsinghua UniversityBeijing 100084China College of Global Change and Earth System Science Beijing Normal UniversityBeijing 100875China

Rice is an important food crop for human *** distinguishing different varieties and sowing methods of rice on a large scale can provide more accurate information for rice growth monitoring,yield estimation,and phenological monitoring,which has significance for the development of modern *** polarimetric(CP)synthetic aperture radar(SAR)provides multichannel information and shows great potential for rice monitoring and ***,the use of machine learning methods to build classification models is a controversial *** this paper,the advantages of CP SAR data,the powerful learning ability of machine learning,and the important factors of the rice growth cycle were taken into account to achieve high-precision and fine classification of rice ***,CP SAR data were simulated by using the seven temporal RADARSAT-2 C-band data ***,20-two CP SAR parameters were extracted from each of the seven temporal CP SAR data *** addition,we fully considered the change degree of CP SAR parameters on a time scale(ΔCP_(DoY)).Six machine learning methods were employed to carry out the fine classification of rice *** results show that the classification methods of machine learning based on multitemporal CP SAR data can obtain better results in the fine classification of rice paddies by considering the parameters ofΔCP_(DoY).The overall accuracy is greater than 95.05%,and the Kappa coefficient is greater than *** them,the random forest(RF)and support vector machine(SVM)achieve the best results,with an overall accuracy reaching 97.32%and 97.37%,respectively,and Kappa coefficient values reaching 0.965 and 0.966,*** the two types of rice paddies,the average accuracy of the transplant hybrid(T-H)rice paddy is greater than 90.64%,and the highest accuracy is 95.95%.The average accuracy of direct-sown japonica(D-J)rice paddy is greater than 92.57%,and the highest accuracy is 96.13%.

关键词： compact polarimetric(CP)SAR rice paddy machine learning fine classification multitemporal