库拉索芦荟花抗过敏功效研究

通过研究库拉索芦荟花提取物诱导斑马鱼体内Tryptase分泌的水平,分析Compoud 48/80刺激产生Tryptase分泌量的抑制率,评估库拉索芦荟花提取物的抗过敏功效。研究结果表明,芦荟花提取物的体积分数分别为0.1%、0.2%和0.4%时,能够显著抑制Compoud 48/80刺激产生Tryptase分泌量,证明库拉索芦荟花提取物在化妆品中具备潜在的抗过敏功效。     

库拉索芦荟花的抗氧化功效研究

通过观察研究库拉索芦荟花提取物对斑马鱼体内ROS水平影响,测试库拉索芦荟花提取物的抗氧化功效,实验结果表明,芦荟花提取物在低浓度下对LPS刺激产生的ROS分泌量均具有显著的抑制作用,研究证明芦荟花提取物在化妆品应用中具备显著的抗氧化功效。     

库拉索芦荟花的抗过敏功效研究

通过检测模型组织活力、组织形态、炎症因子IL-1α和TNF-α的变化评估芦荟花提取物样品的抗炎功效.研究结果表明,库拉索芦荟花提取物在质量分数5％的工作浓度时,能显著提升模型的组织活力,对模型活细胞数目减少、排列疏松等现象有明显改善作用;同时库拉索芦荟花提取物在质量分数5％的工作浓度下表现出对IL-1α的显著降低作用,...     

3D皮肤模型法评估库拉索芦荟花的美白功效研究

通过研究以库拉索芦荟花处理Mela Kutis~?3D黑素皮肤模型后,与50 m J/cm~2 UVB刺激组相比,模型的L~*值、黑色素含量与表观色度检测结果,评估库拉索芦荟花提取物的美白功效。研究结果发现,与UVB刺激组相比,用库拉索芦荟花提取物处理模型后,样本表观色度均有所变白,L~*值均极显著提升(P 0.01),黑色素含量均极显著降低(P 0.01),从表观色度、L~*值和黑色素含量角度可以得出,库拉索芦荟花提取物表现出较好的美白功效。     

库拉索芦荟大分子凝胶的保湿功效研究

通过体外培养角质形成细胞,以MTT法测定其主动保湿和锁水屏障相关蛋白的变化情况,研究了库拉索芦荟大分子凝胶的保湿功效。结果发现,库拉索芦荟大分子凝胶在低浓度下也能够增加角质形成细胞中主动保湿、锁水屏障相关蛋白AQP-3和ZO-1的表达,表明库拉索芦荟大分子凝胶在化妆品应用中具备出色的保湿功效。     

库拉索芦荟提取液对皮肤水分的影响研究

利用皮肤测试仪测试皮肤中水分含量和皮肤水分流失率,得到库拉索芦荟提取液的在化妆品中的最佳添加量。结果表明:添加15%库拉索芦荟提取液的产品,皮肤中水分含量和经皮水分流失均能达到较优的效果。     

中国芦荟与库拉索芦荟的化学成份比较研究

本文对云南省元江县引种的产于云南元江河谷的野生中国芦荟 (简称元江芦荟 )及库拉索芦荟进行了比较研究。研究结果表明 ,二种芦荟的主要化学成份基本一致 ,分布部位也相同。均含有芦荟中具有生理活性的特征化合物、氨基酸、维生素、矿物质等成份 ,但是某些成份的含量有差异。元江芦荟是一种具有发展潜力的芦荟品种。目前这方面的研究未见报导     

芦荟凝集素的理化性质及其对动物细胞生长的影响

对分别从中华芦荟、库拉索芦荟和木立芦荟叶肉组织中分离提取得到的 3种凝集素 (命名为Lec1、Lec2和Lec3)进行了理化性质的比较研究 ,考察了三者的分子质量 ,对糖抑制的专一性和糖基组成。结果表明Lec1和Lec3的相对分子质量为2 3 0 0 0 ,而Lec2为 2 6 0 0 0 ,只有Lec3能被麦芽糖抑制。糖基组成分析结果表明 ,三者的糖链部分主要由甘露糖、葡萄糖和N 乙酰氨基葡萄糖构成。三种芦荟凝集素能够识别并抑制K562乳腺癌细胞的生长 ,中华凝集素、库拉索凝集素、木立凝集素的抑瘤率IC50值分别为 4 1 93、2 30 5、1 41 8mg/ml。而在质量浓度 >2 5mg/ml时它们对成纤维细胞FC的生长有一定的促进作用。动物体内实验进一步证实了芦荟凝集素的抑瘤作用 ,同时表明芦荟凝集素能够激发机体的免疫功能来抵御癌细胞的入侵     

药用植物库拉索芦荟中金属元素的分析

采用湿式消解库拉索芦荟样品后ICP-AES法同时测定了芦荟中Cr、As、Zn、Mg、Mn、Fe、Cu、Ni、Ca、Al、Co、Sr、Pb、Ag等15种元素的含量。测定结果显示:库拉索芦荟中人体必须的元素含量较高,而对人体有害的元素含量较低。加标回收率在97.5%~105.5%之间,相对标准偏差RSD≤0.84%,检出限在≤0.009μg/L。     

功效奇特的植物——芦荟

1芦荟品种之间的比较 芦荟是百合科（Liliaceae）芦荟属（Aloe）多年生多肉质草木植物。目前，芦荟属植物包括变种共有500多种。各国竞相开发的只有5-6种，最常见的为：库拉索芦荟，开普芦荟（Aloe ferox Mill），木立芦荟（Aloearboescens Mill），中国芦荟。     

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.     

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。     

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.