大米发酵滤液皮肤美白保湿功效的研究

通过人体对照试验测定皮肤白度L~*值、亮度ITA°值、皮肤黑色素含量MI值、皮肤水分含量MMV值,研究大米发酵滤液在皮肤美白和保湿方面的功效。结果显示:通过4周的试验,涂抹了含有大米发酵滤液样品的试验人群相对于基质组皮肤白度L~*值和亮度ITA°值在第2周和第4周数值有明显的提高;皮肤黑色素MI值随着时间的延长呈降低趋势;皮肤含水量MMV值增高明显。表明大米发酵滤液作用于肌肤,具有很好的美白保湿功效。     

一款美白产品的功效研究

制备一种美白精华乳,并对其美白和保湿功效进行研究。选择24名女性志愿者,按要求在前臂内侧持续使用美白精华乳8周,测试皮肤相应位置的MI值、L*值、ITA°值、皮肤角质层水分含量的变化情况。结果表明,使用化妆品8周后,皮肤的MI值、L*值、ITA°值和水分含量与初始值之间具有显著性差异(P<0.05),表明产品具有一定的美白和保湿功效。     

一种含抗坏血酸四异棕榈酸酯精华液的美白功效测试与分析

探讨一种含抗坏血酸四异棕榈酸酯(VC-IP)美白精华液的保湿、美白效果.选取30名有效健康志愿者作为研究对象,连续8周每天早晚各使用1次含VC-IP美白精华液,且停用其他美白护肤品.选用无创仪器检测方法,分别于使用0周、2周、4周、6周和8周测试皮肤角质层水分含量、黑度值、L*值和ITA°值,并用面部图像分析仪VISI...     

一款玻色因眼霜的抗衰老功效分析与研究

制备一款玻色因眼霜,并评价其抗衰老效果。选择33名有效受试者作为研究对象,选用无创仪器检测方法,分别测试使用后0、4和8周的皮肤角质层水分含量、皮肤L^*值、皮肤弹性、粗糙度、皱纹体积和皱纹面积占比,以及受试者主观评价结果。结果表明,使用产品后能显著提高皮肤含水量、增加皮肤白皙度、增强皮肤弹性和减少眼部皱纹,说明其玻色因眼霜具有良好的抗衰老功效。     

一款面膜的功效评价

对一款面膜产品进行功效评价。选择32名志愿者,按要求持续使用面膜4周,测试皮肤角质层水分含量、经皮水分流失量、皮肤弹性、皮肤白度、皮肤明亮度以及皮肤敏感性的变化情况。结果表明,使用产品四周后,皮肤各项测试指标与初始值均具有显著性改善(P0.05)。此款面膜具有保湿、修复皮肤屏障、增加皮肤弹性、提亮肤色和舒敏的功效。     

一款冻干面膜对特定皮肤屏障受损人群的功效性和安全性

探讨玉泽积雪草安心修护面膜(以下简称冻干面膜)在点阵激光术后对于屏障修护的功效性和安全性,对 24 例进行面部 CO₂点阵激光治疗后的受试者给予冻干面膜使用,通过临床评估指标和 VISIA 皮肤图像分析仪进行疗效评价。使用产品 7 天后,与点阵激光术后即刻相比,受试者面部斑点、皱纹、纹理、毛孔、红斑、红度和紫质的分值均下降,其中纹理、红斑、红度分值下降显著(P < 0.05);皮肤干燥程度下降,皮损积分上升,与点阵激光术前基础值相比无显著性差异(P > 0.05);79% 受试者评价使用感受为“舒适”及以上 ;发生 3 例轻度不良反应事件,仅局部表现瘙痒及散发性小丘疹,均未做额外处理,自行好转。说明冻干面膜能显著改善点阵激光术后面部纹理、红斑、红度,具有明显的修护皮肤屏障和改善肤质的作用,且安全性较高。     

松茸化妆品的美白功效评价

对以松茸为主要功效成分的化妆品进行人体美白功效评价。选择30名20~45岁女性,按要求在曲臂内侧使用化妆品8周后,测试使用前后皮肤MI值,L*值和ITA°值,实验结果均有显著性差异(P0.05)。Duncan多重比较表明,松茸化妆品的美白功效与抗坏血酸乙基醚化妆品相当,且显著大于配方基质。实验通过数据采集与统计分析,可直观反映化妆品中活性添加剂的美白效果,适用于添加活性物质的化妆品的美白功效评价。     

一种复方中草药提取液的护肤功效研究

采用体外实验和人体实验相结合方法,对5种中草药为原料制成的复方提取液进行美白、抗衰老、抗敏舒缓功效研究,并对其刺激性进行评价。结果表明,复方提取液的刺激性分级为无刺激性,具有较强的抑制酪氨酸酶活性、清除DPPH/羟基/超氧阴离子自由基及抑制透明质酸酶活性的能力;使用含复方提取液的乳液4周后,能显著减少皮肤黑色素含量和降低皮肤紫外斑、黄褐斑、皱纹、纹理分值;此外,含复方提取液的乳液能够降低乳酸刺痛程度。上述结果说明该复方中草药提取液使用安全性高,具有较好的美白、抗衰老、抗敏舒缓功效。     

两款祛痘印精华的功效对比

研究了两款化妆品祛痘印精华的临床功效对比,选取30位20～40岁志愿者,随机分成两组,每组15人按要求在脸部连续使用4周祛痘印精华.利用无创仪器检测方法,分别测试受试者使用前后经皮水分流失TEWL值、皮肤白度、皮肤红度、面部卟啉的变化情况,并用VISIA-CR面部成像系统拍摄面部图片.结果显示,使用样品之后,两组志愿者...     

含活性肽复合物的眼部护理组合无创性功效评价与分析

为了探究含活性肽复合物的眼部护理组合的抗皱效果,选取32例受试者开展功效试验。连续4周早晚各联合使用一次眼部精华及眼部肌底精华。选用无创仪器测试使用后几个时间点的皮肤水分和弹性,用面部图像拍照系统拍摄左右脸对比,并用图像分析软件分析眼部皮肤纹理。结果显示,该组合可显著提高眼部肌肤水分、紧致眼周肌肤、淡化皱纹,即含活性肽复合物的眼部护理组合能够抗衰老和改善眼周问题。     

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。