检索结果-南通市图书馆

Identification of Fusarium wilt resistance gene SiRLK1 in Sesamum indicum L.

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2024年第1期12卷 252-261页

作者： Yinghui Duan Wenwen Qu Shuxian Chang Ming Ju Cuiying Wang Cong Mu Hengchun cao Guiting Li Qiuzhen Tian Qin Ma Zhanyou Zhang haiyang Zhang Hongmei Miao The Shennong Laboratory Zhengzhou 450002HenanChina Henan Sesame Research Center Henan Academy of Agricultural SciencesZhengzhou 450002HenanChina Key Laboratory of Specific Oilseed Crops Genomics of Henan Province Henan Sesame Research CenterHenan Academy of Agricultural SciencesZhengzhou 450002HenanChina

Sesame Fusarium wilt(SFW),caused by Fusarium oxysporum f.***.sesami(Fos),is one of the most devastating diseases affecting sesame cultivation.Deciphering the genetic control of SFW resistance is pivotal for effective disease management in sesame.An inheritance study on a cross between the highly resistant variety Yuzhi 11 and the highly susceptible accession Sp1 using a Fos pathogenicity group 1 isolate indicated that resistance was conferred by a single dominant allele.The target locus was located in a 1.24 Mb interval on chromosome 3 using a combination of cross-population association mapping and bulked segregant analysis.Fine genetic mapping further narrowed the interval between 21,350 and 21,401 kb.The locus Sindi_0812400 was identified as the SFW resistance gene and officially designated SiRLK1.This gene encodes a specific malectin/receptor-like protein kinase with three putative tandem kinase domains and is considered a kinase fusion protein.Sequence analysis revealed that a high proportion(49.44%)of variants within the locus was located within the kinase domainⅢ,and several of which were evidently associated with the diversity in SFW response,indicating the critical role of kinase domainⅢin expression of disease resistance.These findings provide valuable information for further functional analysis of SFW resistance genes and marker-assisted resistance breeding in sesame.

关键词： Breeding for resistance Genetic analysis Molecular analysis Tandem kinase domain

Orbital cyclicity in sedimentary sequence and climatic indications of C-O isotopes from Lower Cretaceous in Qingxi Sag, Jiuquan Basin, NW China

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2019年第2期10卷 467-479页

作者： Siding Jin haiyang cao Hua Wang Michael Wagreich Sylvain Richoz State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology College of Energy Resources Chengdu University of Technology Institute of Sedimentary Geology Center for Post-doctoral StudiesChengdu University of Technology Key Laboratory of Tectonics and Petroleum Resources China University of Geosciences Department of Geodynamics and Sedimentology University of Vienna Institute of Earth Sciences NAWI GrazUniversity of Graz

Sedimentary deposits of the Lower Cretaceous Xiagou Formation form the most significant potential hydrocarbon reservoirs in the Qingxi Sag, Jiuquan Basin(NW China). Zircon U-Pb ages of the dated basalts at the top of the Xiagou Formation give an isochron age of 115.6 Ma, and the sedimentation interval of the Xiagou Formation was speculated to range from about 125/124 Ma to 115 Ma based on paleontological research and stratigraphic correlation analysis. Here we use GR logging data as a palaeoenvironmental and palaeoclimatic proxy to conduct a detailed cyclostratigraphic study of five selected wells. Power spectra, evolutionary fast Fourier transformation and wavelet analysis all reveal significant sedimentary cycles in the Xiagou Formation. The ratios of cycle wavelengths in these stratigraphic units are 33.82 m : 7.91 m : 3.06 m : 1.79 m, which is similar to the ratio of orbital targets of 20 : 5 : 2 : 1. The ratio of 20 : 5 : 2 : 1 is interpreted as Milankovitch cycles of 405 kyr long eccentricity,100 kyr short eccentricity, 37 kyr obliquity, and 22 kyr precession cycles respectively. A high-resolution astronomical time scale is constructed by tuning the stratigraphy into target curves of orbital cycles respectively. Based on the astronomical time scale, the absolute ages of 55 samples were estimated,which are used for subsequent stable carbon and oxygen isotope stratigraphy analysis. The analysis results of the five studied wells in the Qingxi Sag indicate:(1) a negative trend of δ^(13)C values upwards in the Xiagou Formation, and(2) negative δ^(18)O values with a positive trend upwards. Both relatively heavy values and pronounced covariances of δ^(13)C values and δ^(18)O values indicate an arid-evaporationcontrolled climate during the sedimentary period of the Lower Cretaceous Xiagou Formation, Qingxi Sag, Jiuquan Basin. Moreover, positive covariances of SQK_1g_(2+3) indicate extremely high temperature, and negative covariances of SQK_1g_1 indicate a relatively low temperature.

关键词： Jiuquan Basin Qingxi Sag Xiagou Formation Orbital cyclicity Stable isotope

在线全文

学校读者我要写书评

暂无评论

入口效应对管内压力及含气率分布的影响研究

工程热物理学报 2024年第5期45卷 1405-1410页

作者：于海洋徐强曹业奇黄博郭烈锦西安交通大学动力工程多相流国家重点实验室西安710049

本文在直径80mm,高度11m的竖直管内对空气-水两相流动开展了可视化实验研究。实验的工况选取为表观气相速度J_(G)=0.03~16.53m·s^(-1),液相速度J_(G)=0.04~2.00m·s^(-1)。根据压力、压差传感器获取的数据,本文分析了入口效应对两相流... 详细信息

本文在直径80mm,高度11m的竖直管内对空气-水两相流动开展了可视化实验研究。实验的工况选取为表观气相速度J_(G)=0.03~16.53m·s^(-1),液相速度J_(G)=0.04~2.00m·s^(-1)。根据压力、压差传感器获取的数据,本文分析了入口效应对两相流动的影响。在泡状流动区域内,压力随气速的增加而下降的趋势较缓,在弹状流内下降趋势加快。在流动转变为搅动流时,压力下降趋势再次减缓。随着液速增加,各位置的压力下降由缓到急的趋势所对应的气速逐渐增大。在气速大于10m·s^(-1)时,发生了靠近入口位置的含气率突然增大的现象。随着液速增加,入口处含气率突增现象对应的气速逐渐降低。

关键词：入口效应含气率压力分布

在线全文

学校读者我要写书评

暂无评论

440 MPa级高强钢焊缝金属的断裂韧性

材料研究学报 2024年第2期38卷 151-160页

作者：曾道平安同邦郑韶先代海洋曹志龙马成勇钢铁研究总院焊接研究所北京100081 兰州交通大学材料科学与工程学院兰州730070

使用自研的Si-Mn-Ni气保护实心焊丝对440 MPa级高强钢进行MAG焊,并在系列温度下进行冲击试验、疲劳裂纹扩展速率试验和裂纹尖端张开位移试验,研究了焊缝金属的断裂韧性和显微组织对断裂韧性的影响。结果表明:焊缝金属的韧脆转变温度约为... 详细信息

使用自研的Si-Mn-Ni气保护实心焊丝对440 MPa级高强钢进行MAG焊,并在系列温度下进行冲击试验、疲劳裂纹扩展速率试验和裂纹尖端张开位移试验,研究了焊缝金属的断裂韧性和显微组织对断裂韧性的影响。结果表明:焊缝金属的韧脆转变温度约为-48.4℃;随着恒幅载荷(13~17 kN)的增大载荷循环次数N减小、疲劳寿命降低,且在应力强度因子范围ΔK相同的情况下疲劳裂纹扩展速率da/d N总体上随着恒幅载荷的增大而减小;焊缝金属的CTOD值δ为0.481~0.781 mm,有效特征值δ_(0.2BL)为0.5103 mm,CTOD值δ的离散系数仅为16.5%,表明焊缝金属的良好断裂韧性满足海洋工程的技术要求;阻碍裂纹扩展能力较强的针状铁素体使断裂韧性提高,而阻碍裂纹扩展能力较弱的准多边形铁素体和易诱发微裂纹的M-A组元使断裂韧性降低。

关键词：金属材料 440 MPa级高强钢焊缝金属断裂韧性显微组织

复杂地质条件下智能化煤矿不安全行为综合防控研究

在线全文

学校读者我要写书评

暂无评论

技术与创新管理 2024年第1期45卷 81-86,118页

作者：华海洋曹卫何敏洁皖北煤电集团招贤矿业有限公司陕西宝鸡721599 中煤西安北斗科技有限公司陕西西安710100

不安全行为是引发煤矿事故的主要原因,不安全行为防控能有效遏制各类事故的发生。为了研究复杂地质条件下智能化煤矿不安全行为综合防控体系,首先确定了不安全行为影响因素,将影响因素按照个体、设备、环境、管理分为4大类,并细化为20... 详细信息

不安全行为是引发煤矿事故的主要原因,不安全行为防控能有效遏制各类事故的发生。为了研究复杂地质条件下智能化煤矿不安全行为综合防控体系,首先确定了不安全行为影响因素,将影响因素按照个体、设备、环境、管理分为4大类,并细化为20个影响因素。然后,运用熵权法查找了人、机、环、管防控的关键点。最后,建立了不安全行为综合防控体系,该体系以减少和杜绝不安全行为为主线,以“基层建设、基础建设、基本功建设”为基础,以不安全行为事前源头预防、事中观察控制、事后奖惩溯源矫正为措施,对不安全行为进行全方位、全过程综合防控。

关键词：智能化不安全行为影响因素防控

Effects of igneous bodies on modification of modern slope morphology: Insights from the continental slope offshore Dongsha Islands, South China Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2019年第5期38卷 109-117页

作者： Chao Liang Xinong Xie Hua Wang Guangjian Zhong Entao Liu Ming Sun Hai Yi Chunyu Qin haiyang cao Jie He Yanpu Zhao College of Marine Science and Technology China University of GeosciencesWuhan Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan Faculty of Earth Resources China University of GeosciencesWuhan Guangzhou Marine Geological Survey China Geological Survey Institute of Sedimentary Geology Chengdu University of Technology

A statistical analysis for the morphological parameters extracted from numerous seismic profiles, and a highresolution seismic study of the southeastern slope of the Dongsha Islands(South China Sea) with water depth between approximately 500 and 3 100 m, has revealed the variation of morphological features due to the intrusion of igneous bodies and associated sedimentary processes. Three types of the continental slope are distinguished:(1) a rough and steep slope with multiple igneous bodies(Type 1),(2) a relatively smooth and gentle slope with the single igneous body(Type 2), and(3) a smooth and gentle slope without igneous bodies(Type 3). These igneous bodies, formed in the post-seafloor spreading of the South China Sea, are often characterized by high positive seismic amplitudes, and chaotic reflections with complex shapes. The igneous bodies in Type 1 separated the slope into two or more upper sub-sags and a lower main-sag, in which the sub-sags and main-sag could be filled with sediments transported by alongslope bottom currents at the same time. Whereas, the igneous body in Type 2 just separated the slope into an upper sub-sag and a lower main-sag, in which the sediments could be transported into the lower main-sag only after the upper sub-sag has been filled up. Type 3 represents a normal slope with common clinoform progradation. The modern slope morphologies in the study area are the results of adjustments of the continental slope due to the intrusion of igneous bodies and associated sedimentary processes. The distinctions among three types of modern slope morphologies indicate different depositional conditions and adjustments of slope morphologies.

关键词： igneous bodies modern slope morphology Dongsha Islands South China Sea

CD1c下调与乳腺癌预后不良和免疫浸润相关

在线全文

学校读者我要写书评

暂无评论

中国免疫学杂志 2024年第2期40卷 283-287,292页

作者：于海洋陈钦昊王子鸣曹越越潘跃银中国科学技术大学附属第一医院合肥230000 皖南医学院芜湖241000

目的:通过TCGA数据库和GEO数据库探究CD1c基因在乳腺癌(BRCA)中的表达与预后的关系。方法:应用GEPIA、Kaplan-Meier Plotter和R软件对CD1c的功能和作用进行综合分析与验证。通过定量逆转录聚合酶链反应(qRT-PCR)和免疫组织化学(IHC)方... 详细信息

目的:通过TCGA数据库和GEO数据库探究CD1c基因在乳腺癌(BRCA)中的表达与预后的关系。方法:应用GEPIA、Kaplan-Meier Plotter和R软件对CD1c的功能和作用进行综合分析与验证。通过定量逆转录聚合酶链反应(qRT-PCR)和免疫组织化学(IHC)方法检测CD1c在BRCA中的表达水平。结果:与乳腺正常组织相比,CD1c在BRCA中低表达。通过对多个数据集的样本进行Kaplan-Meier生存分析,结果显示CD1c低表达组患者总体预后明显较差。免疫相关性分析揭示CD1c与iDC细胞、T细胞、DC细胞及B细胞具有较强的相关性。qRT-PCR结果显示,相比配对的癌旁组织,CD1c在BRCA组织中低表达(P<0.01)。IHC结果显示,CD1c高表达与患者较长的PFS相关(P=0.024)。结论:CD1c的低表达与BRCA患者预后不良显著相关,其表达与免疫浸润联系紧密,或可为BRCA患者的免疫治疗提供新的帮助。

关键词：乳腺癌预后 TCGA CD1c 免疫调节

在线全文

学校读者我要写书评

暂无评论

基于稀疏编码的复杂机械振动信号盲分离方法

噪声与振动控制 2024年第1期44卷 168-173,186页

作者：王金东王畅赵海洋李彦阳曹威龙黄飞虎东北石油大学黑龙江省石油机械工程重点实验室黑龙江大庆163000

复杂机械振动信号激励源较多,故源信号之间互为相关源,且较难满足统计独立特性,导致传统盲源分离方法分离效果不佳。对此,提出一种基于信号稀疏编码的机械振动信号盲分离方法。盲源分离的关键在于对混合矩阵的精确估计,然而机械振源中... 详细信息

复杂机械振动信号激励源较多,故源信号之间互为相关源,且较难满足统计独立特性,导致传统盲源分离方法分离效果不佳。对此,提出一种基于信号稀疏编码的机械振动信号盲分离方法。盲源分离的关键在于对混合矩阵的精确估计,然而机械振源中相关成分的存在严重影响混合矩阵的估计。对此,首先对观测信号进行短时傅里叶变换,增加信号稀疏性;然后利用稀疏编码筛选出具备直线聚类特性的时频观测点,利用K均值(K-means)聚类法找到聚类中心;最后利用所提筛选规则找到估计的混合矩阵,重构出源信号。通过对往复压缩机故障数据的分析,验证了所提方法有效性。

关键词：振动与波盲源分离相关源稀疏编码直线聚类压缩机故障信号

Three-dimensional thermohaline structure estimation derived from HY-2 satellite data over the Maritime Silk Road and its applications

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2024年第5期43卷 41-53页

作者： Zhiqiang Chen Xidong Wang Xiangyu Wu Yuan cao Zikang He Dakui Wang Jian Chen Key Laboratory of Marine Hazards Forecasting Ministry of Natural ResourcesHohai UniversityNanjing 210024China Laboratory for Regional Oceanography and Numercial Modeling Qingdao Marine Science and Technology CenterQingdao 266061China National Marine Environmental Forecasting Center Ministry of Natural ResourcesBeijing 100081China Beijing Institute of Applied Meteorology Beijing 100029China

Estimated ocean subsurface fields derived from satellite observations provide potential data sources for operational marine environmental monitoring and prediction systems.This study employs a statistic regression reconstruction method,in combination with domestic autonomous sea surface height and sea surface temperature observations from the haiyang-2(HY-2)satellite fusion data,to establish an operational quasi-realtime three-dimensional(3D)temperature and salinity products over the Maritime Silk Road.These products feature a daily temporal resolution and a spatial resolution of 0.25°×0.25°and exhibit stability and continuity.We have demonstrated the accuracy of the reconstructed thermohaline fields in capturing the 3D thermohaline variations through comprehensive statistical evaluations,after comparing them against Argo observations and ocean analysis data from 2022.The results illustrate that the reconstructed fields effectively represent seasonal variations in oceanic subsurface structures,along with structural changes resulting from mesoscale processes,and the upper ocean’s responses to tropical cyclones.Furthermore,the incorporation of HY-2 satellite observations notably enhances the accuracy of temperature and salinity reconstructions in the Northwest Pacific Ocean and marginally improves salinity reconstruction accuracy in the North Indian Ocean when compared to the World Ocean Atlas 2018 monthly climatology thermohaline fields.As a result,the reconstructed product holds promise for providing quasi-real-time 3D temperature and salinity field information to facilitate fast decisionmaking during emergencies,and also offers foundational thermohaline fields for operational ocean reanalysis and forecasting systems.These contributions enhance the safety and stability of ocean subsurface activities and navigation.

关键词： HY-2 satellite observations subsurface structures reconstruction Maritime Silk Road operational thermohaline product