黄花蒿粗提物与吡螨胺混用对朱砂叶螨的联合毒力

采用玻片浸渍法在室内条件下测定了黄花蒿丙酮粗提物按不同配比与吡螨胺混用后对朱砂叶螨的室内毒力,以明确黄花蒿丙酮粗提物与吡螨胺混用后的增效作用.结果表明:黄花蒿丙酮粗提物与吡螨胺对朱砂叶螨单用对朱砂叶螨的LC50值(48 h)分别为423.23、5.46 mg/L.两者按质量比为180.9:1混用后增效作用达到最强,共毒系数为357.4,对朱砂叶螨的LC50值为84.26 mg/L.     

茶皂素与甲霜灵混配对黄瓜疫病菌的增效作用

采用菌丝生长速率法与共毒系数法测定了茶皂素、甲霜灵及其混剂对黄瓜疫病菌的室内毒力以及增效比率(SR),同时测定了混剂对黄瓜疫病田间小区接种防治效果.结果表明:茶皂素与甲霜灵有效成分质量比为4:6和3:7时对病菌菌丝具有较强的抑制作用,SR分别为2.53和1.76,为显著增效作用,且茶皂素与甲霜灵混剂(4:6)对黄瓜疫病田间小区接种防治效果显著优于2种单剂及对照药剂.     

25%噻.喹乳油防治柑桔红蜘蛛田间药效试验

通过试验显示，噻．喹乳油防治柑桔红蜘蛛不但防治效果好，１０００倍液药后１天为９１．４％，３天为９１．２％，１０天为９５．６％，而且药产的持续时间也较长，可达４０天以上。它克服了噻螨酮防治柑桔红蜘蛛前期效果差和喹硫磷药效持续时间短的缺点。     

协同效应在WO型微乳液中的作用

本文通过拟三元相图、增溶、电导和表面张力测定等方法,研究了烷基羧酸盐(CnH_(2n+1)COONa)与十六烷基三甲基溴化铵(CTAB)复配在正戊醇存在下对煤油—水体系W/O型微乳液形成的协同效应,发现在整个复配范围内同时出现协同效应和反协同效应。而且,发生协同效应的复配范围是在羧酸盐的高比例区,此时,体系的W/O型微乳区域面积扩大。     

40%辛·氯氟氰菊酯乳油防治棉花害虫研究

４０％辛·氯氟氰菊酯乳油田辛硫磷与氯氟氰菊酯及其他助剂调配而成，经室内毒力测定对棉铃虫的共毒系数为５２５．０７，对大白鼠急性经口ＬＤ５０为３１６毫克／公斤，属中等毒性；田间小区药效试验和大面积示范证明，对棉蚜，棉铃虫，棉红铃虫，小地老虎和灯蛾等害虫防效显著，是棉田防治多种害虫较理想的复配制剂。     

棉铃宝等4种农药防治棉铃虫的效果

田间试验和室内试验表明，５０％棉铃害宝乳油对棉铃虫幼虫和卵，２６％灭铃皇乳汪对棉铃虫幼虫均具理想的防治作用。喷施棉铃害７５毫升／６６７米＾２后７天，虫卵综合防效达９４．４％，喷施棉铃宝１００倍液和灭铃皇１００倍液后５天，对２－１龄幼虫的防治效果分别在９６．７％和９３．３％。     

Enhanced Photo Catalytic Activity of ZnO Nano Particles Co-doped with Rare Earth Elements (Nd and Sm) Under UV Light Illumination

Journal of Inorganic and Organometallic Polymers and Materials - In the present report, synthesis of zinc oxide (ZnO) nano particles (NPs) in pure form, 1 wt% of neodymium (Nd)-doped and 1 wt% of...     

Studies on the Separation and Recovery of Uranium from Phosphoric Acid Medium Using a Synergistic Mixture of (2-Ethylhexyl)phosphonic Acid Mono 2-Ethyl Hexyl Ester (PC-88A) and Tri-n-octylphosphine Oxide (TOPO)

This paper deals with studies on the extraction of uranium(VI) from phosphoric acid medium using (2-ethylhexyl)phosphonic acid mono 2-ethylhexyl ester and tri-n-octylphosphine oxide individually as well as from their synergistic mixture. Different extraction parameters were investigated. With an increase in phosphoric acid concentration in the aqueous phase, the distribution ratio (Du) was found to decrease in all the cases. Synergism was observed when a mixture of PC-88A and TOPO was used. The synergistic mixture in the mole ratio of 4:1 (1.80 M PC-88A: 0.45 M TOPO) in xylene was found to be most suitable for uranium extraction. Among the various strip liquors used, 5% (w/v) solution of (NH₄)₂CO₃ was found to be the most suitable. Using a mixture of 1.8 M PC-88A and 0.45 M TOPO as the extractant system and 0.5 M ammonium carbonate as the stripping agent, uranium recovery was found to be better than 97% ± 3% in multiple contacts, (n = 2) from actual Davies Gray Waste while in case of wet phosphoric acid more than 52% ± 3% (n = 3) only could be recovered where n is the number of contacts.     

棉铃虫对不同类型杀虫剂抗性衰退比较

用采自河北省冀县的棉铃虫田间抗性种群、研究对三氟氯氰菊酯、久效磷、灭多威的皑生衰奶变化,结果表明,不接触药剂在室内饲养４代后期是多种害虫并发的对三氟氯氰菊酯的搞所属性衰退最快,同时发现棉铃虫对三氟氯氰菊酯的Ｋｄｒ抗性个频率衰退速度明显快于其总抗性个体频率和抗性指数。久产磷和灭多威的抗性衰退速率相当     

两种农药对抗药性小菜蛾的联合作用研究

利用ＴＤＭ（ｔｉｍｅ－ｄｏｓｅ－ｍｏｒｌａｌｉｔｙ）模型处理生物测定数据,采用Ｃｒａｆｔｓ法进行混肥寻优。结果表明：对小物而言辛硫磷和阿维菌经按质量（有效成分）之比为４９：１混配时增效作用最大。室内结果在田间试验中得到验证。     

八种杀虫剂对棉田龟纹瓢虫,草间小黑蛛的影响

在棉田常用的８种杀虫剂中，对害虫天敌瓢虫安全的杀多灭威和哒螨灵；对草间小黑蛛安全的杀虫剂有啉虫啉、哒螨灵和灭多威。３种拟除虫菊酯类杀虫剂对两种天敌的毒性最大，有机磷类杀虫剂则低于菊酯类。     

Effect of dehydrochlorination of PVC on miscibility and phase separation of binary and ternary blends of poly(vinyl chloride), poly(ethylene-co-vinyl acetate) and poly(styrene-co-acrylonitrile)

The enhancement of miscibility at the lower critical solution temperature (LCST) of the blends poly(vinyl chloride)/poly(ethylene-co-vinyl acetate) (PVC/EVA), poly(vinyl chloride)/poly(styrene-co-acrylonitrile) (PVC/SAN) and poly(vinyl chloride)/poly(ethylene-co-vinyl acetate)/poly(styrene-co-acrylonitrile) (PVC/EVA/SAN) was observed at the micron level. Such miscibility is attributed to the dehydrochlorination and formation of hydrogen bonds between blend components. However, macrolevel immiscibility of these blends heated to the LCST was observed. Such microdomain compatibility of these blends gives a synergistic character. Brittle-type failure observed for LCST samples testifies to the synergism in treated blends. ©1997 SCI