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研究了UV-B辐射下番茄幼苗抗氧化系统的反应。试验用两个剂量(15.0 kJ.m-2和30.0 kJ.m-2)诱导番茄幼苗的氧化伤害,结果脂质过氧化增加及叶绿素含量降低和SOD活性下降。这些结果表明,UV-B辐射可以诱导番茄幼苗抗氧化防御系统,使植物在胁迫下存货。 相似文献
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采用黄度指数仪、激光扫描共聚焦显微镜(CLSM)和透光率雾度测定仪等研究了2种紫外光吸收剂(UV-A、UV-B)与受阻胺光稳定剂(HALS)协同使用对通用级聚苯乙烯(GPPS)树脂抗紫外光老化性能的影响。结果表明:加入HALS,UV-A,UV-B均可有效抑制GPPS树脂因紫外光老化作用而发生降解。在紫外光环境下,紫外光吸收剂(UV-A,UV-B)对样品抗紫外老化性能的提升效果均优于HALS,其中,UV-A最优。HALS与2种紫外光吸收剂(UV-A,UV-B)复配时均表现出良好的抗紫外光老化协同作用。 相似文献
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PP/TAIC/PE共混体系的辐射增强相界面反应研究 总被引:5,自引:0,他引:5
研究了PP/TAIC(三烯丙基异腈脲酸酯)/PE共混体系的辐射增强相界面反应。应用SEM、DDV对共混体系的形态结构和相容性进行了表征,发现多官能团单体TAIC对PP/PE体系有较好的辐射增强作用,共混物的力学性能得到改善。 相似文献
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介绍了青春痘产生的机理和影响因素,研究了药用植物的成分及功效,提出了药用植物提取物与抗菌肽结合开发去痘美容化妆品,该化妆品可以为皮肤护理带来新的健康理念。 相似文献
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综述了橡胶粉的预处理方法对橡胶沥青性能的影响,分析了脱硫降解(热机械法、化学法、微波辐射法及微生物法),脱硫再生,活性增强(等离子体活化、氧化处理及增容调和)和偶联处理等方法的适用性,并提出了今后的研究方向。 相似文献
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红色果实类药用植物浸制标本的制作方法研究 总被引:1,自引:0,他引:1
《广州化工》2017,(6)
为了研究红色果实类药用植物浸制标本的保色技术,我们采用对人体无毒害,制作方法简便,价格低廉的保存液对红色果实类药用植物浸制标本的制作方法进行了研究。结果表明红色果实类药用植物珍珠椒,富贵果,枸杞的原色浸制标本保色取得了成功。红色果实类药用植物浸制标本制作方法的研究成果在教学、科研、标本的陈列和展示,以及艺术观赏等领域都发挥了重要的作用。 相似文献
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Priv. Doz. Dr. Felix Zelder Marjorie Sonnay Lucas Prieto 《Chembiochem : a European journal of chemical biology》2015,16(9):1264-1278
Antivitamins represent a broad class of compounds that counteract the essential effects of vitamins. The symptoms triggered by such antinutritional factors resemble those of vitamin deficiencies, but can be successfully reversed by treating patients with the intact vitamin. Despite being undesirable for healthy organisms, the toxicities of these compounds present considerable interest for biological and medicinal purposes. Indeed, antivitamins played fundamental roles in the development of pioneering antibiotic and antiproliferative drugs, such as prontosil and aminopterin. Their development and optimisation were made possible by the study, throughout the 20th century, of the vitamins' and antivitamins' functions in metabolic processes. However, even with this thorough knowledge, commercialised antivitamin‐based drugs are still nowadays limited to antagonists of vitamins B9 and K. The antivitamin field thus still needs to be explored more intensely, in view of the outstanding therapeutic success exhibited by several antivitamin‐based medicines. Here we summarise historical achievements and discuss critically recent developments, opportunities and potential limitations of the antivitamin approach, with a special focus on antivitamins K, B9 and B12. 相似文献
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An intelligent system for non-isothermal drying of medicinal plants, based on machine vision, sensor fusion, and neural network, was developed. Air temperature, velocity, and humidity, along with material size and moisture content were inputs to the neural model for diffusivity. Temperature, time, mass, volume, and color were inputs to the neural model for quality. Isothermal low-temperature drying of ginseng root and blueberry showed extremely low effective diffusivity (0.2–0.75)*10?10 m2/s. In contrast, non-isothermal drying demonstrated a potential to increase diffusivity and prevent quality losses. Testing of the intelligent drying system showed reduced drying time from 240 to 60 hours for ginseng, and from 110 to 30 hours for blueberry with desired product quality. 相似文献
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