检索结果-南通市图书馆

Genome-wide screening of long non-coding RNAs involved in rubber biosynthesis in Eucommia ulmoides

Journal of Integrative Plant Biology 2018年第11期60卷 1070-1082页

作者： Huimin Liu Yan Lu Juan Wang Jingjing Hu Tana wuyun State Key Laboratory of Tree Genetics and Breeding Non-timber Forest Research and Development CenterChinese Academy of ForestryZhengzhou 450003China State Key Laboratory of Tree Genetics and Breeding Research Institute of ForestryChinese Academy of ForestryBeijing 100091China Chemistry department University of Missouri-ColumbiaColumbia MO 65201USA Inertia Shanghai Biotechnology Co. Ltd.Shanghai 200335China

Increasing evidence indicates that long non- coding RNAs （IncRNAs） play pivotal roles in regulatory networks controlling plant and animal gene expression. However, IncRNA roles in regulating rubber biosynthesis in Eucommia ulmoides, an emerging source of natural rubber （Eu-rubber）, are currently unknown. Here, we report on RNA deep-sequencing of E. ulmoides fruits at two developmental stages. Based on application of a stringent pipeline, 29,1o3 IncRNAs and 9,048 transcripts of uncertain coding potential （TUCPs） were *** differentially expressed （DE）TUCPs appear to simultaneously regulate 12 protein-coding genes involved in Eu-rubber biosynthesis （GIEBs）, as well as 95 DE genes. Functional categorization of these 95 DE genes indicated their involvement in subcellular microstructures and cellular processes, such as cell wall, cell division, and growth. These DE genes may participate in the differentiation and development of laticifers, where Eu-rubber is synthesized. A model is proposed in which ＂commanders＂（DE TUCPs） direct the ＂builders＂（DE genes） to construct a ＂storehouse＂ of materials needed for Eu-rubber synthesis, and the ＂workers＂（GIEBs） to synthesize Eu-rubber. These findings provide insights into both cis- and trans-polyisoprene biosynthesis in plants, laying the foundation for additional studies of this crucial process.

关键词： RNA Genome-wide screening of long non-coding RNAs involved in rubber biosynthesis in Eucommia ulmoides Eu

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于深度学习的“一膜两年用”玉米全膜双垄沟种床特征识别方法研究

引用

干旱地区农业研究 2024年第4期42卷 298-310页

作者：蒲俊羽戴飞史瑞杰王久鑫宋学锋李璐赵武云甘肃农业大学机电工程学院甘肃兰州730070

为更加准确掌握“一膜两年用”玉米全膜双垄沟覆膜种床特征,提高其智能化生产水平,采用基于深度学习的目标检测网络模型开展“一膜两年用”玉米全膜双垄沟种床特征识别方法的研究,对种床结构中的残膜、根茬和覆土带进行检测识别。结果表... 详细信息

为更加准确掌握“一膜两年用”玉米全膜双垄沟覆膜种床特征,提高其智能化生产水平,采用基于深度学习的目标检测网络模型开展“一膜两年用”玉米全膜双垄沟种床特征识别方法的研究,对种床结构中的残膜、根茬和覆土带进行检测识别。结果表明:优化后的YOLOx网络模型的效果相关值(mAP)为90.76%,检测结果优于其他网络模型。为探究无人机拍摄图像对目标检测结果的影响,采用三因素三水平BOX-Behnken试验设计方法,建立无人机飞行高度、无人机飞行角度和无人机飞行速度与评价网络模型mAP值的数学模型,寻求无人机拍摄的最优参数组合并进行试验验证,当无人机飞行高度为0.9 m、飞行角度100°、飞行速度2.2 m·s^(-1)时,评价网络模型效果相关的响应值达到最优。经验证,无人机拍摄参数优化后,网络模型的mAP值为92.67%,检测效果优于其他组模型。

关键词：全膜双垄沟种床特征深度学习目标检测无人机拍摄

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Determination of the coefficient of rolling friction of irregularly shaped maize particles by using discrete element method

引用

International Journal of Agricultural and Biological Engineering 2020年第2期13卷 15-25页

作者： Linrong Shi wuyun Zhao Bugong Sun Wei Sun School of Mechanical and Electrical Engineering Gansu Agricultural UniversityLanzhou 730070China

The coefficient of rolling friction is a foundation parameter for conducting particles simulation,however,which of irregularly shaped maize seeds is difficult to ***,the coefficient of rolling friction between the simulation particles and the actual seeds is inconsistent due to the shaped difference of model and different position of gravity *** paper use two methods to determinate the coefficient of rolling friction based on discrete element method(DEM)and physical *** types of maize models from five different shaped maize samples(including horse-tooth shape,spherical cone shape,spherical shape,oblate shape,irregular shape)were developed with the help of slice modeling and 3D modeling *** cylinder container is used to arrange the simulation experiments of angle of repose with taking the coefficient of rolling friction as independent variables and the simulation angle of repose as target *** predicting detailed the coefficient of rolling friction(including horse-tooth shape,spherical cone shape,spherical shape,between horse-tooth shape and spherical cone shape,between horse-tooth shape and spherical shape,between spherical shape and spherical cone shape maize models),and forecasting a unified the coefficient of rolling friction among horse-tooth shape,spherical cone shape and spherical shape maize models,two types of materials(aluminum cylinder container and organic glass container)were used to validate the difference the angle of repose between the simulation maize models and actual maize *** show the relative error of the angle of repose between the maize models controlled by the coefficient of rolling friction through the detailed method and the actual maize seeds is 0.22%,0.33%in aluminum cylinder,organic glass container,*** relative error of the angle of repose between the simulation maize models controlled by the coefficient of rolling friction through the united method and a

关键词： coefficient of rolling friction maize irregularly shaped model angle of repose discrete element method

来源：

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

长柄扁桃良种‘蒙扁4号’

引用

园艺学报 2024年第S1期51卷 37-38页

作者：包文泉包福海白玉娥乌云塔娜敖敦王淋内蒙古农业大学林学院呼和浩特010018 中国林业科学研究院经济林研究所郑州450003

‘蒙扁4号’长柄扁桃是由内蒙古林木良种繁育中心长柄扁桃资源圃中筛选出的高产、晚花优良单株育成。果实长圆形,成熟时红褐色,密被短柔毛,平均单果质量1.67 g,单仁质量0.28 g。在内蒙古地区,果实成熟期7—8月,盛果期单株产量可达1.21~1... 详细信息

‘蒙扁4号’长柄扁桃是由内蒙古林木良种繁育中心长柄扁桃资源圃中筛选出的高产、晚花优良单株育成。果实长圆形,成熟时红褐色,密被短柔毛,平均单果质量1.67 g,单仁质量0.28 g。在内蒙古地区,果实成熟期7—8月,盛果期单株产量可达1.21~1.26 kg。采用嫁接繁殖,适宜在内蒙古绝大部分地区栽培。

关键词：长柄扁桃品种

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

西北旱区大豆玉米复合种植联合播种机的设计与试验

引用

中国农业大学学报 2024年第5期29卷 103-114页

作者：曲经武戴飞史瑞杰赵武云马海军马明义甘肃农业大学机电工程学院兰州730070 甘肃洮河拖拉机制造有限公司甘肃定西730500

针对西北旱区大豆玉米复合种植机具短缺、机械化程度低等问题,设计西北旱区大豆玉米复合种植联合播种机。该机由旋耕装置、起垄装置、覆土装置、施肥装置、播种装置及机架等组成,能够实现旋耕、起垄、施肥、双幅覆膜覆土、镇压及播种等... 详细信息

针对西北旱区大豆玉米复合种植机具短缺、机械化程度低等问题,设计西北旱区大豆玉米复合种植联合播种机。该机由旋耕装置、起垄装置、覆土装置、施肥装置、播种装置及机架等组成,能够实现旋耕、起垄、施肥、双幅覆膜覆土、镇压及播种等多个作业过程。对播种机关键部件进行设计与分析,利用离散元模型对覆土过程进行模拟仿真,分析覆土过程中膜边膜上覆土均匀性;采用DEM-MBD对大豆玉米播种装置耦合仿真,分析大豆玉米播种装置播种均匀性。仿真结果表明:1)土壤因跳跃和泼撒而落到垄面的颗粒数≤1.3%;2)播种装置对大豆和玉米种子挤压力≤10 N,土壤颗粒对鸭嘴的阻力≤50 N。田间试验结果表明:玉米播种装置播种合格率、漏播率和重播率分别为95.63%、1.65%和2.72%,大豆播种装置播种合格率、漏播率和重播率分别为91.24%、0%和8.76%,机组作业期间运行稳定,具有良好的作业效果,满足大豆玉米带状复合种植需求。

关键词：大豆玉米复合种植种植模式覆土装置播种装置 DEM-MBD耦合

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Electrochemical Determination of Trace Amounts of Lead (Ⅱ) and Cadmium (Ⅱ) at a Calix[6]arene Modified Carbon Paste Electrode

引用

Wuhan University Journal of Natural Sciences 2004年第6期9卷 943-948页

作者： JIXiao-bo wuyun-hua FEIJun-jie HUSheng-shui CollegeofChemistryandMolecularSciences WuhanUniversityWuhan430072HubeiChina

An electrochemical method for the simultaneous determination of lead(II) and Cadmium(II) with a calix[6]arene modified carbon paste electrode (CPE) has been developed. Pb2+ and Cd2+ were accumulated at the surface of the modified electrode via formation of chemical complexes with calix[6]arene, and reduced at 1.40 V. During the following anodic potential sweep, reduced lead and cadmium were oxidized, and two well-defined striping peaks appeared at about ?0.60 V and ?0.84 V. Compared with a bare carbon paste electrode, the calix[6]arene modified CPE greatly improves the sensitivity of determining lead and cadmium. The stripping peak currents change linearly with the concentration of Pb2+ 3.0×10?8–8.0×10?6 mol·L?1 and with that of Cd2+ 6.0×10?8–1.0×10?5 mol ·L?1. The detection limits of Pb2+ and Cd2+ are found to be 8.0×10?9 mol·L?1 and 2.0×10?8 mol·L?1, respectively. The modified carbon paste electrode was applied to determine trace levels of lead and cadmium in water samples. Comparing with that of atomic absorption spectrometry, the results suggests that the calix[6]arene modified CPE has great potential for the practical sample analysis. Key words lead(II) - cadmium(II) - calix[6]arene - differential pulse stripping voltammetry - chemically modified electrode CLC number O 657.15 Foundation item: Supported by the National Natural Science Foundation of China (60171023)Biography: JI Xiao-bo (1980-), male, Master, research direction: electroanalytical chemistry.

关键词： lead(II) cadmium(II) calixarene differential pulse stripping voltammetry chemically modified electrode

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

达格列净联合DPP-4抑制剂用于2型糖尿病临床治疗的价值分析

引用

糖尿病新世界 2024年第5期27卷 15-18页

作者：林永阳张妩云郑兰秀福州经济技术开发区医院药剂科福建福州350015

目的分析2型糖尿病(Type 2 Diabetes Mellitus,T2DM)在达格列净联合二肽基肽酶-4(Dipeptidyl Pepti-dase-4,DPP-4)抑制剂治疗下的实际改善效果。方法选取2020年2月—2023年3月福州经济技术开发区医院100例T2DM患者作为研究对象,根据既... 详细信息

目的分析2型糖尿病(Type 2 Diabetes Mellitus,T2DM)在达格列净联合二肽基肽酶-4(Dipeptidyl Pepti-dase-4,DPP-4)抑制剂治疗下的实际改善效果。方法选取2020年2月—2023年3月福州经济技术开发区医院100例T2DM患者作为研究对象,根据既往治疗方案分成参照组(50例,二甲双胍+DPP-4抑制剂)和观察组(50例,二甲双胍+DPP-4抑制剂+达格列净),比较药物不良反应率、血肌酐(Serum Creatinine,Scr)、血尿酸(Blood Uric Acid,BUA)、胆固醇(Total Cholesterol,TC)、三酰甘油(Triglyceride,TG)、餐后2 h血糖(2 h Post-prandial Plasma Glucose,2 hPG)、空腹血糖(Fasting Plasma Glucose,FPG)指标。结果治疗后观察组患者BUA为(302.56±38.28)μmol/L,TC为(4.29±0.74)mmol/L,TG为(1.43±0.44)mmol/L,2 hPG为(9.32±0.42)mmol/L,FPG为(6.42±0.15)mmol/L,低于参照组,差异有统计学意义(t=2.023、5.235、2.284、6.515、26.524,P均0.05)。结论达格列净与DPP-4抑制剂联合应用于T2DM治疗中效果优良。

关键词： 2型糖尿病达格列净 DPP-4抑制剂血糖指标肾功能血脂指标

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

植物VIGS载体构建策略研究与应用进展

引用

园艺学报 2024年第7期51卷 1455-1473页

作者：任恒泽李丹莹余亚婷吕务云郝心愿王新超王玉春浙江农林大学茶学与茶文化学院杭州311300 中国农业科学院茶叶研究所国家茶树改良中心农业农村部特种经济动植物生物学与遗传育种重点实验室杭州310008

病毒诱导的基因沉默(virus-induced gene silencing,VIGS)是一种基于植物抗病毒机制开发的用于基因功能研究的反向遗传学技术。该技术不依赖植物遗传转化体系,具有周期短、操作简单高效、高通量的特点,被广泛应用于植物生长发育、信号... 详细信息

病毒诱导的基因沉默(virus-induced gene silencing,VIGS)是一种基于植物抗病毒机制开发的用于基因功能研究的反向遗传学技术。该技术不依赖植物遗传转化体系,具有周期短、操作简单高效、高通量的特点,被广泛应用于植物生长发育、信号转导、代谢途径和抗逆机制等方面的研究。本文中综述了植物VIGS作用机理、应用和存在的问题,重点讨论了载体构建策略和影响因素等方面的内容,旨在为该技术的进一步发展和应用提供参考。

关键词：病毒诱导的基因沉默基因功能病毒载体沉默载体构建策略

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cadmium pollution enhanced ozone damage to winter wheat:biochemical and physiological evidences

引用

Journal of Environmental Sciences 2011年第2期23卷 255-265页

作者： Yong Li Caihong Li Yanhai Zheng Guanglei Wu Tana wuyun Hong Xu Xinhua He Gaoming Jiang State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing 100093 China Graduate University of Chinese Academy of Sciences BeOing 100093 China State Key Laboratory of Crop Biology Shandong Agricultural University Tai'an 271018 China Forestry College Hebei Agricultural University Baoding 071001 China

Combined effects of ozone （O3） and cadmium （Cd） on growth and physiology of winter wheat （Triticum aestivum L. cv. JM22） were determined. Wheat plants were grown without or with Cd and exposed to charcoal-filtered air （〈 10 ppb O3） or elevated O3 （80 ＋ 5 ppb, 7 hr/day） for 20 days. Results showed that O3 considerably depressed light saturated net photosynthetic rate （-20%）, stomatal conductance （-33%）, chlorophyll content （-33%）, and total biomass （-29%） without Cd. The corresponding decreases were further enhanced by 45%, 56%, 60% and 59%, respectively with Cd, indicating a synergistic effect of O3 and Cd on wheat. Ozone significantly increased the activity of superoxide dismutase （46%）, catalase （48%） and peroxidase （56%）. However, great increases in malondialdehyde （MDA） content （2.55 folds） and intercellular CO2 concentration （1.13 folds） were noted in O3＋Cd treatment compared to control. Our findings demonstrated that the increased anti-oxidative activities in wheat plants exposed to O3＋Cd might not be enough to overcome the adverse effects of the combination of both pollutants as evidenced by further increase in MDA content, which is an important indicator of lipid peroxidation. Precise prediction model on O3 damages to crop should be conducted to ensure agricultural production security by considering environmental constraints in an agricultural system in peri-urban regions.

关键词： antioxidant activity cadmium plant growth ozone stress Triticum aestivum L

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Simulation and test on separating cleaning process of flax threshing material based on gas-solid coupling theory

引用

International Journal of Agricultural and Biological Engineering 2020年第1期13卷 73-81,I0001页

作者： Fei Dai Xuefeng Song Wenjuan Guo wuyun Zhao Fengwei Zhang Shilin Zhang College of Mechanical and Electrical Engineering Gansu Agricultural UniversityLanzhou 730070China School of Cyber Security Gansu Institute of Political Science and LawLanzhou 730070China

In order to further clarify and improve the working performance of separating cleaning device of flax threshing material,and study the motion law and characteristics of components of flax threshing material,in this paper,numerical simulation was carried out on the separating cleaning process of flax threshing material based on CFD-DEM *** results showed that the components of flax threshing material were separated and cleaned under the influence of airflow field,meanwhile,variation curves of quantity and mean velocity of flax seeds in the separating cleaning system were *** referring to streamline distribution of gas-solid coupling,the quantity variation law of components of flax threshing material with time was explored and their motion curves and variation tendency of average velocity were *** test results showed that the cleaning rate of separating cleaning device for flax threshing material was 92.66%with 1.58%of total separation *** with simulation results,the test results were 1.34%and 0.93%lower,showing that it is feasible to apply the gas-solid coupling theory and method to simulate the separating and cleaning operation of flax threshing material.

关键词： flax threshing material separating cleaning device hydromechanics calculation discrete element numerical simulation test

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：