40%柴.哒乳油中哒螨灵的气相色谱

采用气相色谱法，对４０％柴．哒乳油中哒螨灵进行了定量分析。其标准曲线方程为Ｒｓ＝０．７１１２Ｒｍ＋０．０３９８，相关系数为０．９９９６。方法回收率为９９．２％－１００．１％，标准偏差为０．０２％ 异系数为０．４０％。     

三元复配制剂杀虫威的分析方法研究

本文采用气相色谱法，在一根５％ＱＦ－１填充上，以邻苯二甲酸二乙酯和荧蒽为内标，在适宜的色谱条件下对三元复配制剂杀虫威进行分析。方法的变异系数：甲胺磷为０．７３％，异丙威为０．６５％，噻嗪酮为０．５２％。回收率：甲胺磷为９９．０～１００．２％，异丙威为９９．１～９９．７％，噻嗪酮为９９．２～１００．４％。     

反相高效液相色谱法测定快杀稗

选用反相高效液相色谱法，在Ｃ１８反相柱上，以甲醇／ｐＨ３．０水为流动相，以邻苯二甲酸二乙酯为内标物，对快杀稗进行定量分析，９次测定结果，其平均值为８８．７４％，相对偏差为０．３７％，变异系数为０．６３％，平均回收率为９９．１％－１０１．９％，线性相关系数为０．９９９９７。     

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％。     

反相高效液相色谱法测定快杀稗

选用反相高效液相色谱法，在Ｃ１８反相柱上，以甲醇／ｐＨ３．０水（６５／３５ｖ／ｖ）为流动相，以邻苯二甲酸二乙酯为内标物，对快杀稗进行定量分析。９次测定结果，其平均值为８８．７４％，相对偏差为０．３７％，变异系数为０．６３％，平均回收率为９９．１％～１０１．９％，线性相关系数为０．９９９９７。     

三唑磷的气相色谱分析

用３％ＯＶ－１０１的气相色谱填充柱，以邻苯二甲酸双环己酯为内标，用具有氢焰离了化检测器的气相色谱仪对三唑磷原药和油进行了定量分析。原药和乳油的标准偏差分别为０．３和０．２，变异系数分别为０．４％和０．７％，方法的平均回收率为９９．７％，此法操作简便、变量准确。     

38%辛.甲对乳油的液相色谱分析

本文采用液相色谱法同时分析３８％辛．甲对乳油中辛硫磷和甲基对磷磷含量。辛硫磷平均回收率为９９．８％，甲基对硫磷为１０１．４％。辛硫磷标准偏差为０．４７，甲基对硫磷为０．３５。     

反相离子对高压液相色谱法测定二氯喹啉酸的含量

应用反相离子对高压液相色谱法对二氯喹啉酸原药进行了定量测定，获得满意的结果，方法的标准偏差为０．３１％，变异系数为０．３８％，回收率为９９．１１％－１０２．６１％。     

反相离子对高压液相色谱法测定二氯喹啉酸的含量

应用反相离子对高压液相色谱法对二氯喹啉酸原药进行了定量测定，获得满意的结果，方法的标准偏差为０．３１％，变异系数为０．３８％，回收率为９９．１１％～１０２．６１％。     

火焰原子吸收法测定橡胶中的铅

用ＧＦＵ－２０１原子吸收分光光度计对测定橡胶中的铅进行试验研究。测量条件：波长，２８３３；空气流量４．４Ｌ／ｍｉｎ；乙炔流量１．３Ｌ／ｍｉｎ。消除干扰选用０．３％碳酸钙、０．２％Ｆｅ２Ｏ３和０．１５％钾。灵敏度为０．３×１０－６，相对误差±２．３％，均方差０．００００３６％。     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.     

Sapindaceae,cyanolipids, and bugs

Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA.     

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.     

2008～2009年世界塑料工业进展

收集了2008年7月～2009年6月世界塑料工业的相关资料,介绍了2008～2009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、环氧树脂、不饱和聚酯树脂)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。     

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.     

ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究

建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。