共查询到20条相似文献,搜索用时 93 毫秒
1.
石榴皮抑菌活性物质的初步研究 总被引:7,自引:1,他引:6
研究了石榴皮初提物对黄瓜枯萎病菌的室内生物活性.结果表明:在甲醇、氯仿及正己烷提取物中,甲醇提取物的抑菌活性最为显著.采用生长速率法和孢子萌发法测定了石榴皮溶剂萃取物对黄瓜枯萎病菌、番茄灰霉病菌、玉米小斑病菌和棉花立枯病菌等4种病原菌的生物活性.在甲醇提取物的石油醚、氯仿、乙酸乙酯及正丁醇萃取物中,以正丁醇萃取物的抑菌活性最强,在质量浓度为200 g/L时.对4种供试真菌的抑制率均大于70%,而对玉米小斑菌的抑制作用达90.67%,其EC50值为26.2 g/L. 相似文献
2.
《现代农药》2013,(5)
探索荆条的抑菌活性,为综合开发利用提供科学依据。采用生长速率法测定了荆条花和叶的乙醇提取物以及各萃取物对植物病原真菌的抑制作用。结果表明:荆条花乙醇提取物的抑菌活性好于叶。当供试质量浓度为5.0 g/L时,花的乙醇提取物对苹果腐烂病菌、白菜黑斑病菌、番茄早疫病菌和棉花枯萎病菌的抑菌率分别为87.72%、77.32%、72.69%和71.37%。荆条花乙醇提取物不同溶剂萃取物中,石油醚和乙酸乙酯的抑菌活性较高。石油醚萃取物和乙酸乙酯萃取物对苹果腐烂病菌的EC50值分别为0.32 g/L和0.23 g/L;石油醚萃取物和乙酸乙酯萃取物对白菜黑斑病菌的EC50值分别为0.45 g/L和0.20 g/L。石油醚萃取物是进一步研究的重点。 相似文献
3.
藜芦乙醇提取物对植物病原真菌的抑菌活性研究 总被引:1,自引:0,他引:1
通过测定藜芦的乙醇提取物以及各萃取部分对植物病原真菌的抑菌活性,寻找藜芦中的农用活性物质,为其综合开发利用提供科学依据。采用菌丝生长速率法测定了藜芦球茎和根乙醇提取物对6种植物病原菌的抑制作用。试验结果表明,当供试浓度为5.0 mg/mL时,对苹果腐烂病菌(Valsa mali)、棉花枯萎病菌(Fusarium oxysporum f.sp.vasinfectum)和苹果轮纹病菌(Physalospora piricola nose)的抑菌率比较高,分别为96.4%、78.1%和74.3%。藜芦乙醇提取物的不同极性溶剂萃取物的抑菌活性较高,乙酸乙酯萃取物对苹果腐烂病菌和苹果轮纹病菌的EC50分别为0.161 mg/mL和0.551 mg/mL;正丁醇萃取物对苹果腐烂病菌和苹果轮纹病菌的EC50分别为0.190 mg/mL和0.451 mg/mL。乙酸乙酯萃取物是进一步研究的重点。 相似文献
4.
采用索式提取和微波2种方式分别对紫花地丁进行提取,并运用生长速率法测定了各提取物对植物病原真菌的抑制作用。实验结果表明:在4.0 g/L时,微波提取物的抑菌活性(最高86.9%)明显高于索式提取物的活性(最高64.7%)。丙酮提取物对棉花枯萎病菌、柑橘炭疽病菌和小麦全蚀病菌的EC50分别是3.04,2.90,2.78 g/L。 相似文献
5.
[目的]通过对吉林省不同地区104株玉米大斑病菌敏感性的测定,建立吉林省玉米大斑病菌对咪鲜胺的敏感基线。[方法]采用菌丝生长速率法测定。[结果]这些菌株均未对咪鲜胺产生抗性,其中最敏感菌株E C50值为0.002 2 mg/L,最不敏感菌株EC50值为0.061 0 mg/L,测得这些菌株对咪鲜胺EC50值的平均值为(0.030 5±0.015 6)mg/L。[结论]所有菌株敏感性频率分布呈近似正态分布,可将平均EC50值0.030 5 mg/L初步定为吉林省玉米大斑病菌对咪鲜胺的敏感基线。 相似文献
6.
白果提取液及抑菌作用研究 总被引:9,自引:0,他引:9
在白果的根、茎、叶、果肉和果仁中有抑菌物质存在,可用石油醚、丙酮、乙醇等有机溶剂提取。根、茎、叶、果肉和果仁的石油醚和丙酮提取液对玉米小叶斑病菌(Helminthosporium maydis)和苹果轮纹病菌(Physalospora pirilola)均有一定抑制作用,其中以叶的提取液抑菌效果较好。白果果实的乙醇提取液对苹果干腐病菌(Botryosphaeria ribis)抑菌作用明显,10倍液抑菌率为68.5%,对苹果腐烂病菌(Valsa mali)抑菌作用很明显,8.3倍液抑菌率达 相似文献
7.
在实验室条件下,分别测定了1.5%卡松对棉花枯萎病菌、棉花红腐病菌、棉花红粉病菌、棉花黄萎病菌和棉花疫病菌等5种重要植物病原真菌及水稻白叶枯病菌、大白菜软腐病菌等两种重要植物病原细菌的抑制活性。结果表明,1.5%卡松对棉花枯萎病菌的MIC和EC50分别为40mg/L和9.2034mg/L,对棉花红腐病菌的MIC和EC50分别为40mg/L和0.7845mg/L,对棉花红粉病菌的MIC和EC50分别为20mg/L和0.6951mg/L,对棉花黄萎病菌的MIC和EC50分别为20mg/L和2.8383mg/L,对棉花疫病菌的MIC和EC50分别为2mg/L和0.3459mg/L;对水稻白叶枯病菌和大白菜软腐病菌的MIC分别为1mg/L和10mg/L;说明该药剂对供试7种植物病原菌均具有良好的抑制活性,尤以对棉花疫病菌和水稻白叶枯病菌的抑制活性较强。 相似文献
8.
采用菌丝生长速率法测定了穿破石不同部位甲醇提取物对5种植物病原真菌的抑菌活性.结果表明:穿破石根提取物对梨锈病菌、稻瘟病菌、水稻纹枯病菌以及玉米炭疽病菌有很高的抑菌活性,质量浓度为10 g/L时,抑菌率分别为95.51%、99.39%、100.00%、86.11%;有效中浓度(EC50)分别为0.8031、0.9969、0.9812、0.9304 g/L.对柿角斑病菌的活性较低,质量浓度为10 g,L时,抑菌率为66.72%,EC50值为4.6539 g/L.茎叶提取物对上述5种病原菌的抑菌活性较低.采用固-液萃取法对穿破石抑菌活性成分进行了初步分离,结合活性跟踪,发现穿破石抑菌活性成分主要存在于乙酸乙酯萃取层中. 相似文献
9.
10.
11.
乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
13.
14.
D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
__________
Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
15.
16.
Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
17.
18.
A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
19.
塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献