灭幼脲悬浮剂的高效液相色谱分析

采用高效液相色谱法，使用反相色谱柱和紫外检测器，以二甲基甲酰胺为溶剂，邻苯二甲酸二丁酯为内标物，对灭幼脲悬浮剂进行分析测定。方法的标准偏差０．０３４，变异系数０．５２％，相关系数０．９９９９，回收率９９．１％￣１００．２％。     

八种杀虫剂防治枇杷瘤蛾的药效试验

本文报道了８种杀虫剂防治枇杷瘤蛾的试验结果。结果表明，吡虫啉、丁硫克百威、喹硫磷、灭幼脲、氟虫脲的防效均在９０％以上，氧乐果、敌敌畏的防效较差     

八种杀虫剂防治楷杷瘤蛾的药效试验

本文报道了８种杀虫剂防治楷杷瘤蛾的试验结果。结果表明，吡虫啉、丁硫克百威、喹硫磷、灭幼脲、氟虫脲的防效在９０％以上，氧乐果，敌畏的防效较差。     

灭幼脲和喹硫磷混用防治花生三代棉铃虫

２５％灭幼脲１５００倍，２０００倍和２５％喹硫磷６００倍混用防治花生三代棉铃虫，田间防治效果在９０．１－９２．５％之间，灭幼脲和喹硫磷单用防治效果在６３．５－８１．２％之间，百墩活虫数防治指标。     

几种农药对美洲斑潜蝇的防治效果

测定了5％氟虫脲DC、1％氟虫脲OL、25％灭幼脲EC、2．4％苦叁碱．氯氰菊酯EC、50％灭蝇胺SP、10％灭蝇胺ME对美洲斑潜蝇幼虫的田间防效，试验结果表明，氟虫脲、灭蝇胺可较好地控制美洲斑潜蝇的危害，而灭幼脲，苦参碱．氯氰菊酯对美洲班潜蝇的防效较差，不宜单独用于防治美洲斑潜蝇幼虫。     

反相高效液相色谱法同时测定复配制剂中的灭幼脲、抗蚜威、三唑酮

利用反相高效液相色谱外标法测定了来幼脲、抗蚜威、三唑酮的含量。方法标准偏差〈０．５,变异系数〈０．５％,回收率９８．０％～１００．０％。     

灭幼脲缓释微胶囊的制备与性能

[目的]通过对灭幼脲缓释微胶囊的制备和对其性能的测试来提高灭幼脲的稳定性与环境的相容性。[方法]采用壳聚糖和海藻酸钠作为囊壁材料,利用静电吸附层层自组装技术(Layer-by-Layer,LbL法)制备灭幼脲微胶囊。正交优化灭幼脲微胶囊制备工艺,利用扫描电子显微镜和激光共聚焦显微镜表征微胶囊表面结构,研究了微胶囊的体外释放行为。[结果]实验结果表明:分别加入1 mL海藻酸钠(1.0 g/L)、1 mL壳聚糖(1.0 g/L)、20 mg灭幼脲、1 mL氯化钙(1.0 g/L)能得到相对更好的结果。正交试验4个因素中,氯化钙质量浓度对评估结果影响最大;利用优化后的体系制备的灭幼脲微胶囊,平均粒径为10μm,Zeta电位为+23.5 mV;载药量和包封率分别为(68.8±0.86)%和(69.1±0.86)%。[结论]利用这种方法制备的灭幼脲微胶囊具备明显的缓释性能。     

高压液相色谱法测定土壤中灭幼脲3号残留量

国外有许多关于除虫脲(灭幼脲1号)的残留报道,但尚未见到关于灭幼脲3号的残留分析介绍,我们研究了灭幼脲3号的土壤中残留分析方法,以便进一步研究灭幼脲3号在土壤中的残留动态。我们参考了灭幼脲1号有关残留分析方法的文献报道,在做灭幼脲3号的残留分析中,对提取试剂、提取方法、净化条件略加修改,现将方法介绍如下。方法简介: 土样用丙酮回流提取,经过滤,弗罗利硅     

高效液相色谱法测定辛硫磷和吡虫啉的复配制剂

采用ＯＤＳ Ｃ１８色谱柱,甲醇＋水（７０＋３０）为流动相、用二极管矩阵检测器（２５４ｎｍ）,同时测定了２５％蚜虱绝乳油中的有效成分辛硫磷和吡虫啉的含量。该法简便、快速、准确,标准偏差分别为０．１５和０．２１,变异系数分别为０．６１％和０．７３％。     

高效液相色谱法测定辛硫磷和吡虫啉的复配制剂

本文采用ＯＤＳ Ｃ１８色谱柱,甲醇＋水（７０＋３０）为流动相,用二极管矩阵检测器（２５４ｎｍ）,同时测定了２５％蚜虱绝乳油中的有效成分辛硫磷和吡虫啉的含量。该法简便、快速、准确,标准偏差分别为０．１５和０．２１,变异系数分别为０．６１％和０．７３％。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。