Joint Acaricidal Action of Diafenthiuron and Fenbutatin-oxide Against Tetranychus cinnabarinus （Boisduval） （Acari： Tetranychidae）     

Zhenguo YANG  Daoyan XIE  Aisi DA  Xiujun JIANG  Jing NI  Ping HUANG  Jianping CHAI 《农业科学与技术》2014,15(12):2159-2163

[Objective]This study was conducted to obtain a new high-efficiency acaricide mixture.[Method]The synergism acaricidal of diafenthiuron and fenbutatin-oxide against carmine spider mite was investigated,and the optimal ratio of both acaricides were determined by means of co-toxicity factors and co-toxicity coefficients（CTC）.[Result]At 24 h post-treatment,the LC50values of diafenthiuron and fenbutatin-oxide against T.cinnabarinus female adults were 154.67 and 93.26 mg/L,respectively,and the synergistic mass ratios of diafenthiuron and fenbutatin-oxide ranged from 1：0.06 to 1：0.87,and the optimal diafenthiuron-to-fenbutatin-oxide ratio was 1：0.39 with the LC50and CTC of 67.87 mg/L and 188.93（CTC significantly above 100 strongly indicated synergism）,respectively,and the toxicity relative to diafenthiuron and fenbutatin-oxide was 2.28 and 1.37 times,respectively.[Conclusion]The joint acaricidal action of diafenthiuron and fenbutatin-oxide strongly indicates synergism.These findings proved scientific theoretical basis for mixing diafenthiuron and fenbutatin-oxide to control spider mites and developing a new synergisic acaricide.  相似文献   

牛GDF-9基因的克隆与组织表达的分析     

田蕾  刘永斌  王峰  田春英  刘美霞  达赖  祁云霞  董文杰  荣威恒  孙洪深 《华北农学报》2007,22(4):67-70

为了检测牛GDF-9基因mRNA在怀孕期牛生殖系统的表达情况,为GDF-9基因在雌性动物繁殖上的研究提供一定的理论依据。本试验根据GenBank中报道的牛GDF-9基因序列设计引物,从牛卵巢、输卵管、子宫、肾脏中提取RNA,采用RT-PCR技术进行cDNA扩增,扩增产物与载体pGM-T连接,转化大肠杆菌DH5α,筛选阳性克隆,测序。结果表明,已成功克隆的阳性重组子经测序鉴定其片段大小与预期大小完全一致,为264 bp。序列同源性分析比较表明,该cDNA及其推导的氨基酸序列与绵羊GDF-9cDNA和氨基酸序列同源性分别为97%和94%。以-βactin为内参照物,采用RT-PCR技术进行半定量分析,通过检测比较牛GDF-9基因在卵巢、输卵管、子宫、肾脏组织中mRNA的表达情况。结果表明,牛GDF-9基因在卵巢中表达量最高,在输卵管、子宫、肾脏中均有表达,但表达量不高。  相似文献   

上海乡土树种及其在城市绿化建设中的应用   总被引：34，自引：1，他引：34  

杨永川  达良俊 《浙江林学院学报》2005,22(3):286-290

随着生态城市被列为上海市的建设发展目标,城市绿化建设被赋予了新的目标和内涵,生态林将逐渐成为城市绿化的主体,作为生态林建设基础的乡土树种也将得到更为广泛的应用.通过实地调查和资料调查,统计分析了上海市的乡土树种,共42科89属128种(含变种),可以分为常绿阔叶乔木、常绿阔叶灌木、半常绿阔叶灌木、落叶阔叶乔木、落叶阔叶小乔木和落叶阔叶灌木等6个类型.分析了乡土树种在上海绿化建设中的意义和应用现状,并对其应用进行了展望.表1参21  相似文献   

披针叶黄华生物碱成分研究   总被引：4，自引：0，他引：4  

赵宝玉  张靖飞  哈斯巴图 《西北农林科技大学学报(自然科学版)》2002,30(3):9-12

采用 GC- MS联用分析技术从披针叶黄华总生物碱中分离鉴定出 12个喹喏里西啶生物碱 ,即无叶豆碱 ,N-甲基金雀花碱 ,金雀花碱 ,白羽扇豆碱 ,黄华碱 ,臭豆碱 ,N-甲醛基金雀花碱 ,Dodecahydro- 7,14 -methanodipyrido[1,2 - a:1′,2′- E][1.5 ]diazocine,Pyridine1- acetyl- 1,2 ,3,4 - tetrahydro- 5 - (2 - piperdinyl) ,7,14 -Methano- 2 H,6 H- dipyrido[1,2 - a:1′,2′- e][1,5 ]diaz,1,1- Dim ethyl- 3- (2 - nitrophenyl) ,7,14 - Methano- 4 H,6 H-dipyrido[1,2 - a:1′,2′- e][1,5 ]diaz。后 5种化合物为首次从该植物中鉴定  相似文献   

Method for estimation of ocean current velocity from satellite images     

Mollo-Christensen E  Cornillon P  DA S Mascarenhas A 《Science (New York, N.Y.)》1981,212(4495):661-662

Barotropic instability waves on a shear interface propagate at the average speed of the water on the two sides. Assuming the instability to be excited by tidal oscillations, the phase speed is the wavelength divided by the tidal period. If the water is at rest on one side of the shear layer the current speed on the other side can be calculated. This method, applied to the Gulf Stream beyond Cape Hatteras as seen in satellite images, gives estimates of current speed in general agreement with in situ observations.  相似文献   

Eighth millennium pottery from a prehistoric shell midden in the brazilian Amazon     

Roosevelt AC  Housley RA  DA Silveira MI  Maranca S  Johnson R 《Science (New York, N.Y.)》1991,254(5038):1621-1624

The earliest pottery yet found in the Western Hemisphere has been excavated from a prehistoric shell midden near Santarém in the lower Amazon, Brazil. Calibrated accelerator radiocarbon dates on charcoal, shell, and pottery and a thermoluminescence date on pottery from the site fall from about 8000 to 7000 years before the present. The early fishing village is part of a long prehistoric trajectory that contradicts theories that resource poverty limited cultural evolution in the tropics.  相似文献   

Absence of Sickling Phenomenon of the Red Blood Corpuscle Among Brazilian Indians     

DA Silva EM 《Science (New York, N.Y.)》1948,107(2774):221-222

  相似文献   

Novel Colloidal Interactions in Anisotropic Fluids   总被引：2，自引：0，他引：2  

P Poulin  H Stark  TC Lubensky  DA Weitz 《Science (New York, N.Y.)》1997,275(5307):1770-1773

Small water droplets dispersed in a nematic liquid crystal exhibit a novel class of colloidal interactions, arising from the orientational elastic energy of the anisotropic host fluid. These interactions include a short-range repulsion and a long-range dipolar attraction, and they lead to the formation of anisotropic chainlike structures by the colloidal particles. The repulsive interaction can lead to novel mechanisms for colloid stabilization.  相似文献   

黄浦江上游近自然混交林和人工纯林水源涵养功能评价   总被引：1，自引：0，他引：1  

蔡婷  李阿瑾  宋坤  达良俊  徐开钦  燕爱玲 《水土保持研究》2015,(2):36-40

以上海黄浦江上游水源涵养林为研究对象,选择近自然混交林、香樟(Cinnamomum camphora)人工纯林和无患子(Sapindus mukorossi)人工纯林,对比了地上部分、枯落物层、土壤层三个垂直层次的持水量,综合评价了其水源涵养功能。结果表明:地上部分持水量近自然混交林与香樟纯林持平,大于无患子纯林,分别为16.36t/hm2,16.85t/hm2,12.54t/hm2;枯落物层最大持水量依次为近自然混交林(0.37t/hm2)无患子纯林(0.004t/hm2)香樟纯林(0.003t/hm2);土壤层最大持水量近自然混交林(2 657.02t/hm2)无患子纯林(2 526.81t/hm2)香樟纯林(2 474.80t/hm2)。土壤层对森林涵养水源功能的贡献最大,但同时离不开地上部分及枯落物层三者间的相互依存和影响。综合评价得到不同类型林分的总持水量为近自然混交林(2 673.73t/hm2)无患子纯林(2 539.35t/hm2)香樟纯林(2 491.65t/hm2)。由此可见,林分复杂、树种多样、林下植被丰富的近自然混交林涵养水源的能力最强,优于单一的无患子纯林,而香樟纯林最差。  相似文献   

溴虫腈与哒螨灵对朱砂叶螨的联合作用     

杨振国  谢道燕  达爱斯  倪婧 《河南农业科学》2015,(3):88-92

为明确溴虫腈与哒螨灵的联合杀螨活性,采用玻片浸渍法测定了溴虫腈与哒螨灵不同配比混剂对朱砂叶螨雌成螨的杀螨活性,并以共毒因子法和共毒系数法评价混剂的增效作用。结果表明,溴虫腈和哒螨灵对朱砂叶螨雌成螨处理后24 h的致死中质量浓度(LC50)分别为8.80、17.69mg/L;溴虫腈与哒螨灵的质量比为49∶51、47∶53、45∶55时增效最明显,对朱砂叶螨处理后24 h的共毒系数分别为177.94、178.49、173.73,LC50分别为6.65、6.72、7.00 mg/L,其毒力分别是哒螨灵的2.66倍、2.63倍、2.53倍。因此,45%~49%溴虫腈与51%~55%哒螨灵混合具有显著的增效作用。  相似文献