检索结果-南通市图书馆

Afterglow Nanoprobes for In-vitro Background-free Biomarker Analysis

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2024年第2期40卷 213-224页

作者： ZHENG Ting WANG Ying li Xianming li chenghui WU Peng Analytical&Testing Centre State Key Laboratory of Hydraulics and Mountain River EngineeringSichuan UniversityChengdu610064P.R.China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang453007P.R.China Department of Rheumatology and Immunology West China HospitalSichuan UniversityChengdu610064P.R.China

Accurate detection of biomarkers is essential for disease *** the highly sensitive fluorescence probes are feasible for the above goal,it is typically interfered by the auto-fluorescence and light scattering of the biological *** afterglow system(consisting of photosensitizer,afterglow substrate and emitter)based on cascade photochemical reactions exhibits long-lived luminescence(seconds to hours),thus avoiding background *** the assistance of polymers,such as polystyrene microspheres,the photochemical afterglow systems have been transformed into homogeneous and water-soluble nanoparticles,and used for in-vitro biomarker ***,we summarized the principle,preparation and applications of these afterglow nanoparticles,and evaluated their performance in clinical sample testing by comparing with other nanoparticle-based ***,several problems and possible solutions of afterglow nanoparticle-based methods in biomarker determination were also mentioned.

关键词： Photochemical afterglow In-vitro analysis Background-free detection Biomarker

平邑甜茶高位嫁接丽嘎拉苹果树冠层内枝类结构和果实品质、产量的分布

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

果树学报 2024年第5期41卷 887-896页

作者：李宏建于年文宋哲张秀美里程辉韩丽红刘影周家旭辽宁省果树科学研究所辽宁营口115009

【目的】掌握以平邑甜茶为砧木,采用高位嫁接方式的丽嘎拉苹果树冠层内枝类结构、果实产量和品质的分布特点,为辽宁寒地苹果园建设中应用该种栽培模式,提升果品质量、优化栽培措施提供参考。【方法】以丽嘎拉/GM256/平邑甜茶、丽嘎拉/... 详细信息

【目的】掌握以平邑甜茶为砧木,采用高位嫁接方式的丽嘎拉苹果树冠层内枝类结构、果实产量和品质的分布特点,为辽宁寒地苹果园建设中应用该种栽培模式,提升果品质量、优化栽培措施提供参考。【方法】以丽嘎拉/GM256/平邑甜茶、丽嘎拉/平邑甜茶(高接)和丽嘎拉/平邑甜茶(低接)苹果树为试材,按照冠层分格的方法,将试验树从地面到顶部分成4个冠层,比较不同冠层高度内枝类结构、果实产量和品质的分布差异。【结果】丽嘎拉/平邑甜茶(高接)苹果树高、冠径、覆盖率生长速度高于丽嘎拉/GM256/平邑甜茶,丽嘎拉/平邑甜茶(高接)树体外观表现为“小脚”现象,而丽嘎拉/GM256/平邑甜茶表现为“大脚”现象。丽嘎拉/平邑甜茶(高接)苹果树枝量、短枝比例高于丽嘎拉/平邑甜茶(低接)和丽嘎拉/GM256/平邑甜茶。丽嘎拉/平邑甜茶(高接)、丽嘎拉/平邑甜茶(低接)和丽嘎拉/GM256/平邑甜茶枝量分布集中区域为冠层高度>2.00~3.00 m、>3.00 m和>1.00~2.00 m,占全树枝量比例的43.51%、45.37%和47.96%。相同冠层高度内,丽嘎拉/平邑甜茶(高接)果实单果质量、果形指数、硬度、可滴定酸含量、色差L和a值高于丽嘎拉/GM256/平邑甜茶。随着冠层高度的增加,丽嘎拉/平邑甜茶(高接)、丽嘎拉/平邑甜茶(低接)和丽嘎拉/GM256/平邑甜茶果实硬度、可滴定酸含量呈现下降趋势,而固酸比和色差值(L、a、b)呈现上升趋势。丽嘎拉/平邑甜茶(高接)和丽嘎拉/平邑甜茶(低接)果实产量主要分布在冠层高度>2.00 m的空间区域,占全树产量的69.79%和75.55%,而丽嘎拉/GM256/平邑甜茶为>1.00~3.00 m,占比全树产量的74.59%。【结论】以平邑甜茶为砧木,采用高位嫁接的丽嘎拉苹果树枝条数量多、短枝比例高、外观色泽好,树体枝量和果实产量分布集中区域为冠层高度>2.00~3.00 m,该冠层生产的苹果单果质量大、果形指数适中、可溶性固形物含量高。

关键词：苹果枝类结构品质产量树体冠层

维普期刊数据库博看期刊

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

我国苹果砧木资源特性及利用研究进展

北方园艺 2024年第12期 126-133页

作者：周家旭于年文里程辉李宏建张秀美刘影辽宁省果树科学研究所辽宁营口115009

为正确选择和利用苹果砧木,发展苹果经济栽培模式,该研究介绍了国内砧木资源的繁育方式及其特性,从砧木资源的抗性、根系生长和矮化机理方面入手,以嫁接技术和砧穗亲和性为着手点,阐述我国砧木资源的研究进展,以期为我国砧木资源的利用... 详细信息

为正确选择和利用苹果砧木,发展苹果经济栽培模式,该研究介绍了国内砧木资源的繁育方式及其特性,从砧木资源的抗性、根系生长和矮化机理方面入手,以嫁接技术和砧穗亲和性为着手点,阐述我国砧木资源的研究进展,以期为我国砧木资源的利用、砧穗组合的评价及形成该地区完整的砧木评价体系提供参考依据。

关键词：砧木资源抗性矮化性砧穗组合

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

花生红衣对小鼠抗氧化能力研究

畜禽业 2024年第8期35卷 7-11页

作者：李成会赵娜朱莲英唐山师范学院生命科学系/唐山市动物营养与饲料工程重点实验室河北唐山063000

目的通过研究花生红衣对小鼠增重和抗氧化效果,为花生红衣在畜禽养殖中深入开发应用提供数据支持。方法在小鼠日粮中分别添加3%生花生红衣(试验Ⅰ组)、5%生花生红衣(试验Ⅱ组)和3%熟花生红衣(试验Ⅲ组)进行饲喂试验,并测定小鼠体质量、... 详细信息

目的通过研究花生红衣对小鼠增重和抗氧化效果,为花生红衣在畜禽养殖中深入开发应用提供数据支持。方法在小鼠日粮中分别添加3%生花生红衣(试验Ⅰ组)、5%生花生红衣(试验Ⅱ组)和3%熟花生红衣(试验Ⅲ组)进行饲喂试验,并测定小鼠体质量、平均日增质量和血清与肝脏组织中超氧化物气化酶(T-SOD)、谷胱甘肽过氧化物酶(GSH-Px)活性和丙二醛(MDA)含量。结果花生红衣对小鼠体质量和平均日增质量无显著影响(p>0.05);对小鼠血清和肝脏组织中T-SOD和GSH-Px活性与MDA含量具有显著影响。对于T-SOD活性而言,试验Ⅰ组和试验Ⅱ组小鼠血清中T-SOD活性显著高于对照组和试验Ⅲ组(p0.05);试验Ⅱ组肝脏组织中T-SOD活性显著高于试验Ⅰ组、试验Ⅲ组和对照组(p0.05)。对于GSH-Px活性而言,试验Ⅰ组和试验Ⅱ组小鼠血清中GSH-Px活性显著高于对照组和试验Ⅲ组(p0.05);试验Ⅱ组小鼠肝脏组织中GSH-Px活性显著高于对照组和试验Ⅰ组(p0.05),试验Ⅲ组小鼠肝脏组织中GSH-Px活性与对照组相比显著提高(p<0.05)。对于MDA含量而言,3个试验组小鼠血清和肝脏组织中MDA含量均显著低于对照组小鼠血清中MDA含量(p<0.05)。结论花生红衣对小鼠具有较好的抗氧化效果,生花生红衣的抗氧化效果好于熟花生红衣;5%生花生红衣(试验Ⅱ组)抗氧化效果最佳。故在畜禽养殖中添加5%的生花生红衣为宜。

关键词：花生红衣小鼠血清肝脏组织抗氧化能力

考虑动态能耗的无人机采收菠萝田间收集点优化配置研究

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

沈阳农业大学学报 2024年第3期55卷 343-353页

作者：马瑞峻马宏震伍恩慧陈瑜李呈辉洪苑乾华南农业大学工程学院广州510642

为了深化无人机在田间菠萝采收和运输过程中的应用,探索无人机悬停放置菠萝到收集箱中的技术方案。无人机的续航能力限制菠萝采收工作的完成,而对续航能力影响最大的因素是无人机的载重,提出在田间设立菠萝收集点,并确定收集点的最优设... 详细信息

为了深化无人机在田间菠萝采收和运输过程中的应用,探索无人机悬停放置菠萝到收集箱中的技术方案。无人机的续航能力限制菠萝采收工作的完成,而对续航能力影响最大的因素是无人机的载重,提出在田间设立菠萝收集点,并确定收集点的最优设立数量及位置,以确保菠萝采收工作的有效完成。在研究方法上,基于K-means算法寻找最佳收集点位置及分组方式,建立无人机采收菠萝的能耗及成本模型,通过编写程序对模型进行求解,并以无人机续航能力为约束条件,确定了无人机采收菠萝的最大覆盖范围和菠萝采摘数量。通过比较不同设立数量和位置的收集点方案,得出综合最优的结果。在不更换无人机电池的情况下,1台农业无人机采收菠萝约480个,采收面积约44m^(2)。随着收集点设立数量增加,无人机总路程和总能耗呈稳步下降状态,总成本呈稳步上升状态,分析发现667 m^(2)菠萝地设立15个固定位置的收集点时总能耗、总路程和总成本达到均衡最优。无人机采收菠萝的收集点配置优化方案,可为应用无人机进行田间作物采收及运输时收集点的数量和选址提供建设性意见。

关键词：菠萝农业无人机动态能耗收集点配置续航能力

维普期刊数据库博看期刊

Influence of CaCO_3 Whisker Content on Mechanical and Tribological Properties of Polyetheretherketone Composites

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2006年第5期22卷 584-588页

作者： Youxi liN chenghui GAO Ning li College of Mechanical Engineering ＆ Automation Fuzhou University Fuzhou 350002 China

The mechanical and tribological properties of polyetheretherketone （PEEK） composites filled with CaCO3 whisker in various content of 0～45% （wt pct） were investigated. The composite specimens were prepared by compression molding. Tribological testing of composites in dry wear mode against carbon steel ring was carried out on a MM200 block-on-ring apparatus. Data on neat PEEK were also included for comparison. It was observed that inclusion of CaCO3 whisker affected the most mechanical properties and the friction and wear in a beneficial way. With an increase in CaCO3 whisker content, friction coefficient continuously decreased but the trends in wear performance varied. The specific wear rate showed minima as 1.28×10^-6 mm^3/Nm for 25% CaCO3 whisker inclusion followed by a slow increase for further CaCO3 whisker addition. In terms of friction applications, when the tribological and mechanical properties are combined, the optimal content of CaCO3 whisker in the filled PEEK should be recommended as 15% to 20%. Fairly good correlations are observed in friction coefficient vs bending modulus and wear rate vs bending strength, confirming that the bending properties prove to be the most important tribology controlling parameters in the present work.

关键词： CaCO3 whisker Polyetheretherketone (PEEK) Mechanical properties Tribological behaviour

Challenge of biodiesel production from sewage sludge catalyzed by KOH, KOH/activated carbon, and KOH/CaO

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2017年第2期11卷 55-65页

作者： Xuemin Wu Fenfen Zhu Juanjuan Qi Luyao Zhao Fawei Yan chenghui li School of Environment and Natural Resources Renmin University of China Beijing 100872 China Shougang Research Institute of Technology Beijing 100043 China

The considerable compounds content, abundance, and low costs involved has led to the proposal to use sewage sludge as raw material for biodiesel production. The transesterification reaction is catalyzed using an acid catalyst instead of base catalysts because of the high free fatty acid concentration. However, the use of a base catalyst, particularly a solid base catalyst, has certain advantages, including faster reaction speed and easier separation. In this study, we utilize in situ transesterification by base catalyst （KOH, KOH/activated carbon （AC） and KOH/CaO） with sewage sludge as raw material. Many conditions have been tested to increase biodiesel yield through single-factor tests, including mass fraction and catalyst dosage. Preliminary experiments have optimized reaction time and temperature. However, the three catalysts did not work better than H2SO4, which had a maximum yield of 4.6% （dry sewage sludge base） considering the purity by KOH, KOH/CaO, and KOH/AC. The features of the catalyst were analyzed using XRD, BET and SEM. As to BET of KOH/AC and the good spiculate formation of KOH crystal appears to be essential to its function. As for KOH/CaO, the formation of K20 and absorption points is likely essential.

关键词： BiodieselSewage sludgeBase catalystIn situ transesterification

Synthesis,structure and physical properties of the one-dimensional chain complex of tetrathiafulvalene carboxylate

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

Science China Chemistry 2009年第10期52卷 1596-1601页

作者： CHEN Ya li chenghui WANG CaiFeng WU Di ZUO Jinglin YOU XiaoZeng State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical EngineeringNanjing National Laboratory of MicrostructuresNanjing UniversityNanjing 210093China Solid State Microstructure Laboratory Department of PhysicsNanjing UniversityNanjing 210093China

A new Co(Ⅱ) coordination polymer bearing TTF carboxylate group, [{Co2(trioTTF)2(H2O)6}·5H2O]n (1) (trioTTF=2-(5,6,8,9,11,12,14,15-octahydro-[1,3]dithiolo[4,5-h][1,4,13,7,10]trioxadithiacyclopentadecin-2-ylidene)-1,3-dithiole-4,5-dicarboxylate), has been prepared and characterized. In the structure of 1, shorter intermolecular S····S contacts (3.565 △) are found between the trioTTF groups from neighboring chains. The electric conductivity of 1 is poor due to the bulky crown-ether group, but it exhibits ferromagnetic interaction at low temperature.

关键词： syntheses crystal structures tetrathiafulvalene cobalt complexes

Exploration of nano-surface chemistry for spectral analysis

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2013年第18期58卷 2017-2026页

作者： li chenghui liU Rui Lü Yi HOU XianDeng WU Peng College of Chemistry Sichuan University Analytical & Testing Center Sichuan University

The applications of nano-surface chemistry in the field of spectral analysis have attracted growing interest in recent *** this article,we reviewed the applications of nanomaterials-based chemical reactions for spectral analysis,including the development in plasma-catalysis,surface-enhanced spectroscopy,separation and preconcentration,chemical vapor generation,labeling and signal *** of nano-surface chemistry to spectral analysis not only improves the sensitivity and selectivity,broadens the application range of spectral analysis,but also affords analytical community special characterization tools.

关键词：纳米材料光谱分析表面化学频谱分析等离子体催化化学领域化学反应表面增强