检索结果-南通市图书馆

链格孢菌DT-XRKA菌株的除草活性及对作物的安全性

在线全文

学校读者我要写书评

暂无评论

西北农业学报 2024年第4期33卷 752-762页

作者：程海洋程亮朱海霞李娟魏有海郭青云青海大学农林科学院植物保护研究所青海省农业有害生物综合治理重点实验室农业部西宁作物有害生物科学观测实验站西宁810016

从青海省大通县达隆村农田采集自然感病的植物叶片并分离出真菌菌株,以密花香薷为靶标草,通过离体叶片和温室盆栽试验以及作物安全性评价,筛选获得1株具有较好除草活性的生防菌DT-XRKA。结果表明,离体叶片接种DT-XRKA 7 d后,密花香薷叶... 详细信息

从青海省大通县达隆村农田采集自然感病的植物叶片并分离出真菌菌株,以密花香薷为靶标草,通过离体叶片和温室盆栽试验以及作物安全性评价,筛选获得1株具有较好除草活性的生防菌DT-XRKA。结果表明,离体叶片接种DT-XRKA 7 d后,密花香薷叶片上出现产3~4倍于菌饼大小的灰褐色病斑,病斑面积达到了整个叶片的50%以上,在接种处可见大量灰褐色的菌丝,中心黑色,边缘褐色,且叶片开始逐渐失绿变黄,病级达到5级。不同浓度(1.47×10^(1)~1.47×10^(4)个/mL)的DT-XRKA孢子悬浮液对密花香薷的发病率达到67.84%~96.42%,病情指数为51.11~97.97,鲜质量防效达到52.44%~82.67%。作物安全性评价结果表明,DT-XRKA菌株孢子悬浮液对油菜、白菜、番茄、黄瓜和辣椒安全。经形态学特征和rDNA-ITS序列分析将DT-XRKA鉴定为链格孢Alternaria alternata。

关键词：杂草除草活性作物安全性生物防治

青海省2014—2016年小麦条锈菌越夏菌源群体毒性结构分析

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

植物病理学报 2024年第3期54卷 561-570页

作者：陈建雄詹刚明郭青云康振生姚强青海大学农林科学院青海省农业有害生物综合治理重点实验室/农业农村部西宁作物有害生物科学观测实验站西宁810016 西北农林科技大学植物保护学院旱区作物逆境生物学国家重点实验室杨凌712100

为探明青海省不同地区小麦条锈菌(Puccinia striiformis ***)越夏菌源之间的相互关系,于2014—2016年小麦秋苗期,从青海省不同地区采集发病初期的小麦条锈菌样本,利用近等基因系和辅助鉴别寄主进行毒性鉴定,在此基础上对不同年份和地区... 详细信息

为探明青海省不同地区小麦条锈菌(Puccinia striiformis ***)越夏菌源之间的相互关系,于2014—2016年小麦秋苗期,从青海省不同地区采集发病初期的小麦条锈菌样本,利用近等基因系和辅助鉴别寄主进行毒性鉴定,在此基础上对不同年份和地区亚群的小麦条锈菌毒性多样性进行分析。结果表明,青海省小麦条锈菌群体毒性类型丰富,在106份条锈菌标样中共鉴定出65种毒性类型。其中,供试条锈菌群体对Yr25、Yr29和YrA抗条锈病基因的毒性频率最高,均为100%;其次是Yr44,为99.07%;对Yr5和Yr15的毒性频率均为0;除YrTr1基因(1.76%)外,对其余抗条锈基因的毒性频率在45.56%~97.78%之间,表明除Yr5、Yr15和YrTr1这3个基因外,其余24个抗条锈基因的抗性已减缓或丧失。不同采样年份小麦条锈菌系毒性多样性分析结果表明:2016年菌系毒性多样性最高,其次为2014年,2015年最低。不同采样地区小麦条锈菌系毒性多样性分析结果表明:化隆县群体的毒性基因多样性最高,其次为贵德县,民和县的毒性基因多样性最低。2014—2016三年中供试条锈菌群体对Yr5、Yr15和YrTr1基因的毒性频率在0~2.8%,表明这3个基因是当前青海省有效的抗条锈病基因,可进一步加以利用。本研究明确了青海省小麦条锈菌群体毒性类型以及不同地区间条锈菌群体毒性强弱,为该省小麦抗病品种合理布局提供了理论依据。

关键词：小麦条锈病毒性抗条锈基因

麋鹿被毛微量元素、重金属含量及对环境污染的监测作用

在线全文

学校读者我要写书评

暂无评论

野生动物学报 2024年第1期45卷 35-42页

作者：程志斌白加德钟震宇张宇晨张树苗张庆勋单云芳郭青云张盼北京麋鹿生态实验中心北京100076

哺乳动物被毛微量元素和重金属元素含量能够反映其生活状态和栖息地状况,是环境监测中重要的生物化学指示物。对北京南海子和浙江临安两地麋鹿(Elaphurus davidianus)种群被毛中的10种重金属和34种微量元素进行测定,以期探讨麋鹿被毛微... 详细信息

哺乳动物被毛微量元素和重金属元素含量能够反映其生活状态和栖息地状况,是环境监测中重要的生物化学指示物。对北京南海子和浙江临安两地麋鹿(Elaphurus davidianus)种群被毛中的10种重金属和34种微量元素进行测定,以期探讨麋鹿被毛微量元素和重金属含量在栖息环境监测中的可行性。结果表明:除Re元素外,其余43种元素在麋鹿被毛中均被检出,统计分析表明Li、Be、Sc、V、Co、Ga、Rb、Ir、Mo、Cd、Cs、Ba、La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu、Tl、Bi、Th、U、Nb、Ta、Zr和Hf 34种元素为麋鹿被毛的特征元素;与北京南海子麋鹿种群相比,浙江临安麋鹿种群被毛中的微量元素Sr、In、Sb、W、Bi、U和重金属元素Zn、Cu、Cr、Pb、Cd含量更少,其余32种元素含量均高于北京南海子麋鹿种群;独立样本t检验分析表明,麋鹿被毛微量元素和重金属元素含量存在地域差异性,仅Cr(p=0.064)、Ni(p=0.769)、Mo(p=0.129)、Tl(p=0.065)、Zr(p=0.138)和Hf(p=0.057)6种元素差异不显著,其余37种元素差异均显著;北京南海子和浙江临安麋鹿种群的栖息环境和食物均未受到Zn、Cu、Cr、Pb、Cd、V、Co、Ni、Sb和Tl 10种重金属元素污染的威胁。研究表明,麋鹿被毛可作为栖息环境重金属污染的非损伤监测指示材料。

关键词：麋鹿被毛微量元素重金属生物监测

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

鹿角生长发育与再生机制研究进展

野生动物学报 2024年第2期45卷 421-429页

作者：刘芮佳张盼白加德钟震宇郭青云程志斌单云芳张博张浩北京市科学技术研究院北京麋鹿生态实验中心北京100076 中国农业大学动物科学技术学院北京100193

鹿科(Cervidae)动物是反刍动物的一大类群,中国拥有世界上最丰富的鹿科动物种质资源。与其他反刍动物相比,鹿科动物最独特的特点是拥有能够定期再生的器官性骨质角。不同品种的鹿角形态具有较大差异,大部分复杂的大型鹿角主要用于求偶... 详细信息

鹿科(Cervidae)动物是反刍动物的一大类群,中国拥有世界上最丰富的鹿科动物种质资源。与其他反刍动物相比,鹿科动物最独特的特点是拥有能够定期再生的器官性骨质角。不同品种的鹿角形态具有较大差异,大部分复杂的大型鹿角主要用于求偶期的争斗,开展鹿角功能与演化的研究对动物遗传学、行为学和生态学有极高价值。鹿角生长发育受多种因素调控,因每年定期再生与快速生长机制,使鹿角成为研究哺乳动物器官再生的理想模型,同时鹿角快速增殖却极少产生癌变的特性也为癌症治疗研究提供了新的视野。有关鹿角生长发育和再生机制的研究近年来取得诸多重要成果,本文对鹿角的生物学特征和初生发育、成熟脱落与再生过程的研究进展进行综述,以期为鹿科动物种质资源保护利用和深入解析鹿角独特性质遗传机制提供理论依据。

关键词：鹿角发育鹿角再生骨骼再生机制鹿科动物

Boosting charge transfer via interface charge reconstruction between amorphous NiFe-LDH and crystalline NiCo_(2)O_(4)for efficient alkaline water/seawater oxidation

同方期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第6期17卷 4856-4863页

作者： Zhonghang Xing Yi Zhao Yunhai Wang Xiaohe Liu Zhiqiang guo qingyun Chen International Research Center for Renewable Energy and State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Environmental Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China China School of Geology and Environment Xi’an University of Science and TechnologyXi’an 710049China Changqing Engineering Design Co. Ltd.Xi’an 710018China

Electrocatalysts with optimal efficiency and durability for the oxygen evolution reaction(OER)are becoming increasingly important as the demand for alkaline water/seawater electrolysis technology ***,a novel rose-shaped NiFe-layered double hydroxide(LDH)/NiCo_(2)O_(4)composed of amorphous wrinkled NiFe-LDH and highly crystalline NiCo_(2)O_(4)was synthesized with rich *** unsaturated metal sites are generated due to significant charge reconstruction at the heterointerface between the crystalline and amorphous *** metal sites could trigger and provide more active *** density functional theory(DFT)reveals that a new charge transfer channel(Co-Fe)was formed at the heterointerface between NiFe-LDH as electron acceptor and NiCo_(2)O_(4)as electron *** new charge transfer channel boosts interfacial charge transfer and enhances catalytic *** NiFe-LDH/NiCo_(2)O_(4)/nickel foam(NF)drives current densities of 10 and 100 mA·cm−2 with overpotentials of 193 and 236 mV,*** composite electrode demonstrates a fast turnover frequency(0.0143 s−1)at 1.45 V ***(RHE=reversible hydrogen electrode),which is 5.5 times greater than pure NiCo_(2)O_(4),suggesting its superior intrinsic ***,NiFe-LDH/NiCo_(2)O_(4)/NF electrode exhibited negligible degradation after 150 h of uninterrupted running in alkaline seawater *** study introduces a method for preparing high-efficiency electrocatalysts utilized in alkaline water/seawater electrolysis.

关键词： NiFe-layered double hydroxide(LDH)/NiCo_(2)O_(4)/nickel foam(NF) heterogeneous interfaces charge reconstruction water/seawater electrolysis

Bioactive chemical constituents from the marine-derived fungus Cladosporium ***-5

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

Journal of Oceanology and Limnology 2024年第3期42卷 905-914页

作者： Luting DAI Qingyi XIE Jiaocen guo qingyun MA Li YANG Jingzhe YUAN Haofu DAI Zhifang YU Youxing ZHAO College of Food Science and Technology Nanjing Agricultural UniversityNanjing 210095China Key Laboratory of Research and Development of Natural Product from Li Folk Medicine of Hainan Province Institute of Tropical Bioscience and BiotechnologyChinese Academy of Tropical Agricultural Sciences&Hainan Academy of Tropical Agricultural ResourceHaikou 571101China

A new isochromanone,cladosporinisochromanone(1),accompanied by 15 known compounds(2–16)were obtained from secondary metabolites produced by marine-derived fungus Cladosporium *** and HRESIMS spectra elucidation determined the planar structure of *** electronic circular dichroism(ECD)experiment assigned the absolute configuration of *** 1,2,4–6,and 10 displayed different degrees of neuroprotective activities on human neuroblastoma cells *** compounds(1,3–5,and 13)emerged resistance to protein tyrosine phosphatase 1B(PTP1B),further kinetic analysis and molecular docking study indicated that the most potent compound 13(IC50value of 10.74±0.61μmol/L)was found as a noncompetitive inhibitor for *** plasmon resonance(SPR)and molecular docking studies also demonstrated the interaction between compound 12 and Niemann-Pick C1 Like 1(NPC1L1),which has been identified as significant therapeutic target for *** addition,compounds 3,6,and 14 showed attractive inhibitory activity against the phytopathogenic fungi:Colletotrichum ***,library of Cladosporium metabolites is enriched and new active uses of known compounds are explored.

关键词： Cladosporium sp. marine-derived fungus neuroprotective effects protein tyrosine phosphatase 1B(PTP1B) Niemann-Pick C1 Like 1(NPC1L1) antifungal activity

Radical Addition of Perfluoroalkyl Iodides to Alkenes and Alkynes Initiated by Sodium Dithionite in an Aqueous Solution in the Presence of a Novel Fluorosurfactant

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2013年第7期31卷 939-944页

作者： Zhiwei Xiao Huawei Hu Jiaoli Ma qingyun Chen Yong guo Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

A new fluorinated anionic surfactant Cl（CF2）6O（CF2）2SO3N（C2H5）4 was prepared and characterized. The application of the fluorosurfactant allowed the fluoroalkylation to occur in the water without adding organic solvent. The addition of perfluoroalkyl iodides with olefins and alkynes under the initiation of Na2S2O4 in water in the presence of the fluorosurfactant gave the corresponding adducts in good to excellent yields. The fluorosurfactant was suitable for a radical addition process.

关键词： surfactant fuorine aqueous sodium dithionite radical

Density effect and intraspecific competition in a leaf-mining moth on bamboo leaves

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

Journal of Forestry Research 2019年第2期30卷 689-697页

作者： Xiaohua Dai Jiasheng Xu qingyun guo Shengchang Lai Peng Liu Juju Fan Peirong Tang Leafminer Group School of Life and Environmental Sciences Gannan Normal University National Navel Orange Engineering Research Center Jiulianshan National Nature Reserve Administration

When confined to a single leaf, the larvae of most leafminers should suffer intense intraspecific competition. The survival and performance of individuals are expected to decline with increasing larval density within a leaf, showing a negative density-dependent effect. The maximum density of an Elachista Treitschke(Lepidoptera:Elachistidae) miner on Indocalamus tessellatus(Munro)Keng f.(Poaceae: Bambusoideae) under natural conditions can be greater than 40 per leaf, making this a good system for studying intraspecific competition and density *** counted the number of leaves with different mine densities in the field and found a clumped distribution of leafminer larvae among host leaves. The emergence rates of pupae(and last-instar larvae), adults and parasitoids were inversely correlated with larval density. Pupal weight and adult weight also showed negative relationships with larval density. However, pairwise tests showed that there might be no differences in pupal or adult weight at larval densities of 1–10 mines per leaf, indicating that densitydependent effects are more obvious at densities greater than 10 mines per leaf. Intraspecific competition could lead to stable density and consistent body size in surviving individual insects, which would help maintain a sustainable population size. The density threshold could be an indicator of the balance between intraspecific competitive detriments and conspecific aggregation benefits; however, the validity of the threshold density hypothesis requires further testing and confirmation.

关键词： Leafminer Density-dependent Distribution pattern Sustainable population Threshold density

PBL模式结合3D Slicer软件在神经病学临床教学中的应用

在线全文

学校读者我要写书评

暂无评论

河南医学研究 2024年第7期33卷 1294-1297页

作者：李飞翔李婧静朱洪山崔永刚李树强陈文灿马丛丛胡源郭清允吴睿郑州大学第二附属医院神经康复科河南郑州450000

目的探讨以问题为基础的教学法(PBL)结合3D Slicer软件应用与单纯采用PBL教学模式教学效果的比较。方法将在郑州大学第二附属医院神经康复科实习的32名康复治疗学专业实习生随机分组,教学中应用PBL模式结合3D Slicer软件的16名实习生为... 详细信息

目的探讨以问题为基础的教学法(PBL)结合3D Slicer软件应用与单纯采用PBL教学模式教学效果的比较。方法将在郑州大学第二附属医院神经康复科实习的32名康复治疗学专业实习生随机分组,教学中应用PBL模式结合3D Slicer软件的16名实习生为观察组,单纯应用PBL模式的16名实习生为对照组,按教学大纲完成对两组实习生的授课,以出科理论、技能考试、满意度问卷结果为评判方法。结果观察组出科理论考试成绩优于对照组,差异有统计学意义(P<0.05);观察组临床技能考试成绩优于对照组,差异有统计学意义(P<0.05);观察组在教学形式、学习氛围、学习效率、神经系统解剖的掌握、神经系统疾病诊疗临床思维能力的养成5个方面满意程度的总分与对照组比较,差异有统计学意义(P<0.05)。结论在神经康复科实习生临床教学过程中,采用PBL教学模式结合3D Slicer软件较单纯采用PBL教学模式,可显著提高实习生的神经病学理论、临床技能水平与教学满意度。

关键词：以问题为基础的教学法 3D Slicer软件神经病学临床教学