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杀虫植物的研究新进展及应用发展前景 总被引:13,自引:3,他引:13
介绍了近几年杀虫植物研究的新进展,主要包括楝科、卫矛科、豆科、菊科、胡椒科、百部科、瑞香科等科杀虫植物的作用方式和部分植物的有效成分与作用机制及杀虫植物的应用概况,并分析了其应用发展前景。 相似文献
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从茜草科水团花属植物水杨梅中分离得到的化合物达到50种以上,主要为三萜以及三萜皂苷类、色酮类、生物碱类化合物等。艾纳香属植物主要有抑菌活性,抗病毒、抗肿瘤的活性。文章主要介绍瑶药水杨梅在化学成分和生物活性的研究现状。 相似文献
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《中国洗涤用品工业》2021,(9)
通过对天然植物源的抑菌活性进行归纳整理,介绍其目前在洗涤领域中的应用现状,分析并总结其中存在的问题,提出今后的研究方向和解决办法,以期为天然植物源在抑菌抗病毒方面更为深入的研究与开发应用提供新的参考。 相似文献
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目前,页岩气藏的开发已经成为全球能源开发的热点,而中国页岩气藏开发还处于初期阶段,其多元化的发展面临着严峻的挑战。井壁失稳问题经常会出现在钻井作业中,而页岩气藏开发中井壁稳定问题显得更为突出。井壁失稳会导致卡钻、井眼报废等一系列问题,给钻井工程带来巨大损失,因此全面了解页岩气藏井壁稳定性研究进展十分重要。本文从力学、化学及力化耦合三方面出发,综合国内外研究进展,比较全面地对井壁稳定性研究进行了整理和归纳,以便更好的了解页岩气藏井壁稳定性的研究进展,为实际生产和工程应用提供参考。 相似文献
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微乳液在萃取分离中的研究进展 总被引:4,自引:0,他引:4
概述了微乳液的定义及其特性,介绍了微乳液作为分离介质萃取分离金属离子、有机化合物及生化物质等方面的研究进展。指出微乳液萃取过程中不存在毒性试剂,且具有分离速度快、萃取效率高、操作方便、油相可以反复利用等优点,具有良好的工业应用前景。 相似文献
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微反应器作为化学工程学科的前沿和热点方向,逐渐成为聚合物合成的新装备、新工艺与新产品开发的重要平台,得到学术界和产业界的广泛关注。微反应器可实现可控的多相微尺度流动,能够强化聚合反应中的混合、传质和传热过程,严格控制反应时间,实现反应单元的模块化组合。与传统搅拌反应器相比,这些特点使得微反应器在控制聚合物分子量分布,简化反应环境,提高反应选择性,调节聚合物分子结构和宏观形貌等方面展现出了一定优势。本文全面综述了聚合物合成微反应器理论和技术的研究进展,并在新过程和新产品开发、反应动力学测量、微尺度基础研究和反应器放大等方面进行了展望。 相似文献
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Mikko Hupa 《Fuel》2005,84(10):1312-1319
More than half of the recent large-scale FBC installations are designed to burn more than one fuel. Especially the use of various biofuels—as such or besides conventional fuels—is becoming more and more common in the new FBC projects. It is a major challenge to be able to understand and predict the behavior of the FBC system when co-firing of different fuels in different proportions. This paper reviews some of the recent research on the fuels interaction in FBC. It is shown that factors such as flue gas emissions, fouling tendency or bed sintering tendency are seldom simple linear functions of the fuel mixture. Rather, non-linear relationships of some kind are much more common. The examples in the paper deal with gaseous emissions in co-firing of wood and coal, and superheater fouling in co-firing of biomass based fuels with very different ashes. 相似文献
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H. Toda Y. Mochizuki T. Kawanishi H. Kawashima 《Nutrient Cycling in Agroecosystems》2002,63(2-3):167-173
In a coastal agricultural area in the central part of Japan (Shizuoka), we found decreasing nitrate concentration with depth in a shallow groundwater, where the depth to water table varied between 0.6 and 1.2 m below ground surface. High nitrate concentrations (5–29 mg N L–1) were often observed in the upper layer (0–2 m) of the groundwater, but the concentration decreased to less than 1 mg N L–1 in the deeper layer. Ammonium was scarcely detected, and the concentration of dissolved oxygen was usually low (< 1 mgO2 L–1) in the groundwater. Nitrate in the groundwater often had very heavy nitrogen stable isotope ratios (>20{}). There was a negative relationship between nitrogen stable isotope ratio of nitrate and its concentration. When nitrate was injected into the groundwater with acetylene and bromide (a conservative tracer), nitrate concentration decreased to 20% of the initial level within 5 days, accompanied by the increase in nitrite and nitrous oxide concentration and a little change in bromide concentration. These results indicate that microbial denitrification plays a potential role in the decrease of nitrate in shallow groundwater at the study site. 相似文献
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高效液相色谱法分析化妆品中微量成分的研究进展 总被引:1,自引:0,他引:1
综述了高效液相色谱法在化妆品中防腐剂、防晒剂中紫外线吸收剂以及性激素的检测等几个方面的应用;同时,介绍了分析所用的色谱柱、流动相、使用的检测手段以及样品的提取方法;最后针对目前存在的问题,提出了高效液相色谱用于化妆品中微量成分分析的研究方向和发展前景。 相似文献
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微反应器一般是指特征尺寸为微米至百微米级的微型反应器,是微化工系统的核心设备之一。与传统的釜式反应器相比,微反应器在危险或易燃易爆产品的合成过程及快反应过程中体现出独特优势。凭借其优异的传热传质性能,微反应器技术使这些危险化工过程变得更精准、更高效、更安全,具有重要的工业应用价值,也是化工领域的重点发展方向之一。本文主要介绍了近年来微反应器技术在医药、农药、染颜料合成等精细化工领域的进展,重点综述了在霍夫曼重排、环加成、重氮化和偶合、烷基化、氮氧化等典型“强放热快反应”有机合成方向的研究进展,并展望了其发展前景。 相似文献
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Haoyu Xiong Rakesh N. Veedu Sarah D. Diermeier 《International journal of molecular sciences》2021,22(7)
Cancer is one of the leading causes of death worldwide. Conventional therapies, including surgery, radiation, and chemotherapy have achieved increased survival rates for many types of cancer over the past decades. However, cancer recurrence and/or metastasis to distant organs remain major challenges, resulting in a large, unmet clinical need. Oligonucleotide therapeutics, which include antisense oligonucleotides, small interfering RNAs, and aptamers, show promising clinical outcomes for disease indications such as Duchenne muscular dystrophy, familial amyloid neuropathies, and macular degeneration. While no approved oligonucleotide drug currently exists for any type of cancer, results obtained in preclinical studies and clinical trials are encouraging. Here, we provide an overview of recent developments in the field of oligonucleotide therapeutics in oncology, review current clinical trials, and discuss associated challenges. 相似文献