己基咔唑甲酸-白炭黑复合材料的制备与性质研究

将己基咔唑甲醛氧化制得己基咔唑甲酸,再将1.4124g己基咔唑甲酸与1.005g经活化的白炭黑(纳米SiO2)在乙醇溶液中加热回流等实验条件下制得复合材料,并经红外光谱、紫外分光光度法和荧光分光光度法对复合材料进行表征和光学性质研究。结果表明,己基咔唑甲酸-白炭黑复合粉体材料具有较好的紫外吸收和荧光性质。     

邻菲啰啉分光光度法测定离子膜碱中的三氧化二铁

介绍采用邻菲啰啉分光光度法对离子膜碱中三氧化二铁进行的测定,并就吸收曲线、邻菲啰啉铁络合物的稳定性、显色剂浓度对照试验、邻菲啰啉与铁的摩尔比、溶液酸度对络合物的影响以及共存离子消除等条件进行了探讨,以能更好地满足实际检测工作的需要.     

火焰原子吸收光谱法测定白炭黑总铁含量

采用硫酸沉淀法生产白炭黑（沉淀水合二氧化硅），管道容器的腐蚀程度只有从白炭黑成品总铁含量中发现。由此可见，总铁含量测定在白炭黑生产中是不可缺少的。采用经典的邻菲啰啉分光光度法测定铁含量，操作较为繁琐，耗时长，干扰较多，不能满足快速分析的要求。     

氯化钾盐水中铁含量的分析

介绍了采用邻菲啰啉分光光度法与ICP等离子发射光谱仪法分析氯化钾盐水中铁含量的方法。     

关于成品硫酸中铁含量测定的思考

正工业硫酸的检验采用GB/T534—2002《工业硫酸》(以下简称国标)规定的方法,其中测定铁含量的2种方法分别是邻菲啰啉分光光度法(仲裁法)和原子吸收分光光度法。在成品硫酸实际检测工作中,我公司质量管理检测中心采用的是邻菲啰啉分光光度法。通过试验和多年的分析经验以及数据积累,笔者对国标规定的硫酸中铁含量的测定步骤和测定频率进行了探讨,提出几点意见,仅供参考。     

邻菲啰啉分光光度法测定硝酸铵中铁离子含量

依据工业硝酸铵产品的性质及邻菲啰啉分光光度法测定尿素中铁离子含量的原理,确立工业硝酸铵中铁离子含量的测定方法,并对分析条件进行研究。结果表明,选用分光光度法测定工业硝酸铵中铁离子含量时,最大吸收波长为510 nm,邻菲啰啉作显色剂,显色时间为10 min,称取的样品铁质量为0.03~0.06 mg。该方法操作简便,相对标准偏差为0.56%~1.04%,加标回收率在95.0%~103.7%,分析结果准确,精密度好,可用于工业硝酸铵产品中铁离子的测定。     

工业己二酸中微量铁的测定

采用邻菲啰啉分光光度法对工业己二酸中微量铁进行测定？硬舛ń峁梢钥闯龈梅？准确、简便、快速易掌握。     

盐酸中铁含量分析方法的改进

国家标准GB320-93中盐酸中铁含量的测定方法为邻菲啰啉分光光度法。方法原理是用盐酸羟胺将工业合成盐酸中的三价铁离子还原成二价铁离子,在pH为4.5的条件下,二价铁离子与邻菲啰啉反应生成桔红色络合物,在该络合物最大吸收值处(波长为510 nm)测定其吸光度,然后在工作曲线上查得相应的含铁量,经计算求出盐酸中的铁含量。     

邻菲啰啉分光光度法测定羟丙甲纤维素中铁的含量

用邻菲啰啉分光光度法测定羟丙甲纤维素（HPMC）中铁的含量,方法简便、快速、准确,为指导人们选择最佳（HPMC）产品提供了可靠的数据支持。     

铽(镧、钆)-乙酰丙酮-邻菲啰啉配合物的合成及其在塑料中的应用

合成了铽-乙酰丙酮-邻菲啰啉配合物,发现镧、钆对铽-乙酰丙酮-邻菲啰啉配合物具有荧光增强作用,应用荧光镧、铽混合配合物制备了光致发光塑料。     

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.     

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.     

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.     

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。