检索结果-南通市图书馆

Field evaluation of effects of transgenic cry1Ab/cry1Ac,cry1C and cry2A rice on Cnaphalocrocis medinalis and its arthropod predators

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2011年第11期54卷 1019-1028页

作者： xu xueliang HAN Yu WU Gang CAI WanLun YUAN BenQi WANG Hui LIU FangZhou WANG ManQun HUA HongXia Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory College of Plant Science and Technology Huazhong Agricultural University Wuhan 430070 China Institute of Plant Protection Jiangxi Academy of Agricultural Sciences Nanchang 330200 China

The impacts of transgenic Bt rice on target pests and their predators need to be clarified prior to the commercialization of Bt *** this study,the percentages of folded leaves of three transgenic Bt rice lines and non-transgenic parental rice line caused by Cnaphalocrocis medinalis were studied over two successive growing *** addition,the population densities,relative abundance and population dynamics of *** and four species of its natural arthropod predators were investigated at three sites in *** results showed that rice line significantly affected the percentages of folded leaves and population densities of *** *** higher percentages of folded leaves were observed on the non-transgenic rice compared with the three transgenic Bt rice on most sampling *** higher densities of *** larvae and higher relative abundance of *** within phytophages were found on non-transgenic rice compared with three transgenic Bt rice at different sites across the study *** population dynamics of *** larvae were significantly affected by rice line,rice line×sampling date,rice line×year,rice line×sampling date×***,there was little,if any,significant difference in the relative abundance,population density and population dynamics of the four arthropod predators between the three Bt rice lines and non-transgenic *** results of this study indicate that the Bt toxin in transgenic Bt rice can effectively suppress the occurrence of ***,but has no significant effects on the occurrence of the four predatory arthropod species.

关键词： transgenic Bt rice Cnaphalocrocis medinalis population dynamics percentages of folded leaves natural arthropod predator

High-Temperature Target Recognition Based on Spectral Radiation Information

在线全文

学校读者我要写书评

暂无评论

工程科学（英文版） 2006年第1期4卷 65-71页

作者： Fan xueliang Cheng Xiaofang xu Jun Department of Thermal Science and Energy Engineering USTC Hefei 230026 China

Based on the principles of optics and radiometry, the imaging mathematical model is established and the factors of the contrast (signal-noise-ratio) of high-temperature target and the scenery are given. By analyzing not only the differences in spectral properties between objects in the scene, but also the CCD spectral response theoretically, a new method of enhancement of contrast is given. By optimizing the initial image capture stage, using liquid crystal light valve to make a simple modification of the imaging system, the goal of high-temperature object recognition is achieved. The experimental results agree with the theoretical predict.

关键词：高温目标识别视频图象光谱辐射信息液晶光阀

Designing Manufacturing and the Clinic Application of the Prosthesis for the Patients with Large Ocular Defects

在线全文

学校读者我要写书评

暂无评论

眼科学报 1997年第3期13卷 141-143页

作者： xueliang xu, Chengye Wang, Shuangzhen Liu, Yun DengDepartment of Ophthalmology, Xiang Ya Hospital, Hunan Medical University, Changsha 410008, China Department of Ophthalmology Xiang Ya Hospital Hunan Medical University Changsha 410008 China.

Purpose: To design and manufacture the prosthesis of external type for patients with ocular large ***: Silicon and polymethyl methacrylate ( PMMA) were chosen the chief materials: The main procedures are: taking the impression, color mixture, making primitive form of the prosthesis, modification and ***: Fifty patients with large ocular defects took the prosthesis, the cosmetic results are satisfactory. All the patients give satisfactory comments on the 5 main indexes; color 90% , stereofeeling 100% , peripheral difference 86% , fidelity 98% and fixation 86% . Conclusions: To make ocular prosthesis, materials with good quality and complicated technology are needed. The prosthesis made by silicon combined with PMMA show good results. Among the procedures of making prosthesis, color mixture and fixation are the most important . Eye Science 1997; 13:141 - 143.

关键词：聚甲基丙烯酸甲酯硅弥补眼缺陷外科手术

在线全文

学校读者我要写书评

暂无评论

糖尿病性视网膜病变激光治疗的视力预后

中南大学学报（医学版） 2009年第3期34卷 247-251页

作者：刘豫许雪亮中南大学湘雅三医院眼科长沙400013 中南大学湘雅医院眼科长沙410008

目的:探讨糖尿病视网膜病变(diabetic retinopathy,DR)不同分期的患者视网膜激光治疗的视力预后。方法:根据糖尿病性视网膜病变视网膜光凝研究组(Diabetic Retinopathy Photocoagulation Study Group,DRPS)治疗技术规定,将138例(210眼)... 详细信息

目的:探讨糖尿病视网膜病变(diabetic retinopathy,DR)不同分期的患者视网膜激光治疗的视力预后。方法:根据糖尿病性视网膜病变视网膜光凝研究组(Diabetic Retinopathy Photocoagulation Study Group,DRPS)治疗技术规定,将138例(210眼)分别为非增殖期糖尿病视网膜病变(nonproliferativedia-beticretinopathy,NPDR)、增殖前期糖尿病视网膜病变(preproliferative diabetic retinopathy,PPDR)、增殖期糖尿病视网膜病变(proliferative diabetic retinopathy,PDR)的患者行视网膜激光光凝治疗,术后3～6个月监测视力变化,并行眼底荧光血管造影(fundus fluorescence angiography,FFA)检查,观察荧光素渗漏、毛细血管无灌注区、微血管瘤及新生血管等有无消退,酌情补充光凝。随访6～24个月。结果:经过激光光凝治疗后NPDR期视力提高和不变占95.83%,PPDR期视力提高和不变占91.67%,PDR期视力提高和不变占73.81%。3～6月后复查FFA显示,NPDR期有效占95.83%,PPDR期有效占78.33%,PDR期有效占60.31%。结论:DR的不同分期行视网膜激光光凝治疗后视力预后不同,因此,选择合适的时机和合理的激光参数对不同分期DR尤其是伴有黄斑水肿的DR患者进行视网膜激光光凝治疗,是挽救其视功能的关键。

关键词：视网膜病变视网膜激光光凝糖尿病

Characteristics of an Established Retinoblastoma Cell Line HXO-Rb44

在线全文

学校读者我要写书评

暂无评论

眼科学报 1995年第1期11卷 16-21页

作者： Heping xu,Chengye Wang,Hecheng Zhu, Shuangzhen Liu xueliang xu, Youqin JiangDepartment of Ophthalmology ,Xiangya Hospital,Hunan Medical University ,Changsha 410008,ChinaTumor Research Institute of Hunan Medical UniversityDepartment of Ophthalmotogy, Second Teaching Hospital, Hunan Medical University Department of Ophthalmology Xiangya Hospital Hunan Medical University Changsha China.

Purpose: To study the retinoblastoma cell culture and to establish a new retinoblastoma cell ***: 22 retinoblastomas were cultured by using the method of single cell suspension. Characteristics of the cultured cells were studied in the following programs: tumor cell morphology in vitro, electron microscopic, growth curve, cloning in soft agar,immunohistochemistry,karyotype and tumorigenicity. Results: 22 retinoblastomas were cultured successfully in vitro,only a continued cell line HXO-Rb44 was established (more than 3 years). The characteristics of this cell line are that it grew as a suspension of round cell in graps like clusters in vitro, its population doubling time was 44 hours,and it could be cloned in soft a-gar. Histopathologic and ultrastructured pictures showed the characteristics of Rb. HXO-Rb44 cell was positive to NSE and negative to GFAP in immunohis-tochemical staining. A subcutaneous injection of HXO-Rb44 cells produced a retinoblastoma in BALB/C athumic nude ***:

关键词： retinoblastoma cultured tumor cells electron microscopy immunohis-tochemistry cell line.

Janus激酶抑制剂AG490对人视网膜母细胞瘤HXO-RB_(44)细胞JAK2/STAT3信号通路的影响

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中南大学学报（医学版） 2018年第10期43卷 1061-1067页

作者：许蓓陈翔谭佳许雪亮中南大学湘雅医院眼科长沙410008 中南大学湘雅医院皮肤科长沙410008

目的:研究Janus激酶(Janus kinase,JAK)抑制剂AG490对人视网膜母细胞瘤HXO-RB44细胞株体外抗增殖及细胞周期的作用,探讨其对JAK2/信号转导与转录激活因子3(signal transducer and activator of transcription 3,STAT3)信号通路蛋白表达的影响。方法:本实验分为实验组和对照组,实验组又根据不同浓度(6.25,12.50,25.00,50.00,100.00,200.00μmol/L)的AG490处理分为6个不同浓度的实验组。采用细胞的活力测定法检测各组细胞增殖状态。应用流式细胞术对各组中细胞凋亡及周期进行分析。采用Western印迹检测处理后STAT3,p-STAT3及血管内皮生长因子(vascular endothelial growth factor,VEGF)蛋白的表达。结果:AG490处理HXO-RB44细胞株48 h后,随着药物浓度的增加,细胞抑制率增加,细胞存活率下降(均P0.05),其余各实验组差异均有统计学意义(均P<0.05)。结论:JAK抑制剂AG490能抑制HXORB44细胞株生长及增殖,促进细胞的凋亡增加;并通过阻断JAK2/STAT3信号通路而下调STAT3,p-STAT3和VEGF的表达,从而抑制HXO-RB44细胞株的增殖,加速其凋亡。

关键词：视网膜母细胞瘤 Janus激酶2/信号转导与转录激活因子3信号通路血管内皮生长因子分子靶向治疗

在线全文

学校读者我要写书评

暂无评论

人工神经网络的发展及现状

微电子学 2017年第2期47卷 239-242页

作者：徐学良中国电子科技集团公司第二十四研究所重庆400060

人脑由复杂的神经网络构成,拥有极强的信息处理、学习和记忆能力,并且具有功耗低、神经元密度高等特点。利用现有的电路元件搭建出类似大脑功能的人工神经网络成为当今人工智能研究的热点。在人工神经网络的研究中,信息的编码、神经元... 详细信息

人脑由复杂的神经网络构成,拥有极强的信息处理、学习和记忆能力,并且具有功耗低、神经元密度高等特点。利用现有的电路元件搭建出类似大脑功能的人工神经网络成为当今人工智能研究的热点。在人工神经网络的研究中,信息的编码、神经元模型的建立以及突触的选择是最关键的3个要素。分别介绍了4种不同种类的编码方式和4种不同类型的神经元模型。对忆阻器用作神经突触的特点进行了简要阐述,并对其数学模型和对应的工作方式作了详细概括。

关键词：人工神经网络忆阻器神经元突触

Double [5]carbohelicene: facile synthesis, chiroptical properties,isomerization study, and lasing application

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期68卷 233-240页

作者： Peipei Liu Yantong Li Meng-Xiang Wu Hao Kang Xiao-Li Zhao Lin xu Linlin Liu Xiaodong Li Junfeng Fang Zhiwei Fang Ya Cheng Hai-Bo Yang Huakang Yu xueliang Shi State Key Laboratory of Petroleum Molecular & Process Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesSchool of Chemistry and Molecular Engineering East China Normal University School of Physics and Optoelectronics South China University of Technology Institute of Polymer Optoelectronic Materials & Devices State Key Laboratory of Luminescent Materials & Devices South China University of Technology School of Physics and Electronic Science Engineering Research Center of Nanophotonics & Advanced Instrument Ministry of EducationEast China Normal University State Key Laboratory of Precision Spectroscopy School of Physics and Electronic Science East China Normal University

Double carbohelicenes have attracted considerable attention due to their aesthetic structures, distinct π-conjugation extension, inherent chirality, and intriguing optical and electronic properties. Herein, the concise de novo synthesis of a new double[5]carbohelicene 1 together with its chiroptical properties, isomerization process and lasing application is presented. 1 was synthesized by a simple protocol involving the formation of a 6,6′-bipentacene as the key intermediate. It is worth noting that1 existed as two diastereomers 1-PP/MM and 1-PM, which were successfully isolated and unambiguously confirmed by Xray crystallography. The optical resolution of the racemic 1-PP/MM was successfully achieved by chiral-phase highperformance liquid chromatography（HPLC）, and 1-PP and 1-MM were characterized by circular dichroism. Interestingly, it was found that 1-PP/MM could be completely isomerized to 1-PM upon heating, and the detailed thermodynamics and kinetics of the isomerization process were systematically investigated. 1-PM exhibited deep-red luminescence with emission maximum at 723 nm and fluorescence quantum yield as high as 32.95%. Consequently, we can showcase the lasing application of 1-PM by doping with epoxy resin to assemble a bottle microlaser spontaneously, which the lasing wavelength is 796.6 nm at a threshold of 0.8 m J cm-2. We believe that our studies, including the facile synthesis methodology, detailed isomerization studies, and lasing application, will shed some light on the design and synthesis of novel carbohelical systems with more functions.

关键词： double carbohelicene optical resolution organic laser isomerization X-ray diffraction

美伐他汀抑制甲状腺相关眼病眼眶前脂肪细胞的分化

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中南大学学报（医学版） 2010年第5期35卷 511-517页

作者：易文殊许雪亮中南大学湘雅医院眼科长沙410008

目的:观察美伐他汀对体外培养的甲状腺相关眼病(thyroid-associated ophthalmopathy,TAO)来源眼眶前脂肪细胞分化及过氧化物酶体增殖物激活受体-γ(peroxisome-proliferator-activated receptor-γ,PPAR-γ)mRNA表达的影响。方法:眼眶组织取自TAO行开眶减压术的患者。将TAO病眼眶前脂肪细胞分为A组(对照组)与B组(干预组),其中B组又分为B1～B5组,均采用鸡尾酒法诱导10 d,使其分化为脂肪细胞。A组采用常规诱导剂,B1～B3组在分化全程中分别加入5μmol/L(B1组)、10μmol/L(B2组)、20μmol/L(B3组)的美伐他汀,B4～B5组在分化第4天(B4组)与第8天(B5组)分别加入10μmol/L的美伐他汀直至分化结束。分化后的细胞以油红O染色后,于酶联免疫检测仪492 nm波长处测吸光度值,以测定分化后脂肪细胞相对含量。反转录聚合酶链反应法(reverse transcription polymerasechain reaction,RT-PCR)检测各组在分化结束时PPAR-γmRNA的表达水平。结果:分化后的A,B1,B2,B3组细胞吸光度值及PPAR-γmRNA表达均依次下降,组间两两比较差异均具有统计学意义(P0.05)外,A,B4,B2组的吸光度值及PPAR-γmRNA表达均依次下降,组间两两比较差异均有统计学意义(P<0.05)。结论:美伐他汀抑制体外培养的TAO眼眶前脂肪细胞的分化与PPAR-γmRNA的表达,抑制程度呈浓度依赖性,并与前脂肪细胞分化的阶段有关,越在分化的早期,抑制作用越强。

关键词：甲状腺相关眼病美伐他汀过氧化物酶体增殖物激活受体-γ