【目的】研究季节性冻融期土壤细菌和真菌数量的影响因素。【方法】采集中国知网、Web of science等数据库相关土壤季节性冻融期的数据,根据排除和纳入标准,采用Newcastle-Ottawa Scale(NOS)评价标准对文献进行质量评价,将得分≥6分且...【目的】研究季节性冻融期土壤细菌和真菌数量的影响因素。【方法】采集中国知网、Web of science等数据库相关土壤季节性冻融期的数据,根据排除和纳入标准,采用Newcastle-Ottawa Scale(NOS)评价标准对文献进行质量评价,将得分≥6分且高质量的文献纳入研究,运用RevMan5.4对其进行Meta分析。【结果】42篇文献符合纳入标准,其中,SCI文章7篇,CSCD文章27篇。季节性冻融期土壤含水量对土壤细菌的影响显著性最大;土壤pH值对土壤真菌的影响显著性最大,土壤有机质对土壤细菌和真菌影响显著性最小。季节性冻融期,土壤有机氮对土壤细菌影响的优势程度最大,土壤含水量对土壤真菌影响的优势程度最大。【结论】季节性冻融期土壤pH值和土壤含水量对土壤细菌和真菌起到决定性作用。展开更多
From fermentation broth of soil fungus 254-2 obtained from Yunnan province, a new macrocylic trichochecene was isolated. The structure was determined on the basis of spectroscopic evidences especially the 2-D NMR spe...From fermentation broth of soil fungus 254-2 obtained from Yunnan province, a new macrocylic trichochecene was isolated. The structure was determined on the basis of spectroscopic evidences especially the 2-D NMR spectra.展开更多
Here, we have synthesized the silver nanoparticles (AgNPs) by using the soil fungus Aspergillus niger 2587. The results recorded from UV-vis spectrophotometer and transmission electron microscopy (TEM) support the bio...Here, we have synthesized the silver nanoparticles (AgNPs) by using the soil fungus Aspergillus niger 2587. The results recorded from UV-vis spectrophotometer and transmission electron microscopy (TEM) support the biosynthesis and characterization of AgNPs. The synthesized silver nanoparticles have also been tested against the larvae and pupae of Anopheles stephensi, Culex quinquefasciatus and Aedes aegypti. The efficacy test was performed at different concentrations for a period of different hours by the probit analysis. The larvae of Cx. quinquefasciatus have shown the 100% mortality to the synthesized AgNPs after 1 h of exposure, while the larvae of An. stephensi and Ae. aegypti were found less susceptible to the synthesized AgNPs. The pupa of Ae. aegypti has shown the efficacy LC50 4, LC90 12 and LC99 19 ppm after 2 h of exposure of the synthesized AgNPs, while, the pupae of Cx. quinquefasciatus and An. stephensi were found less susceptible to the synthesized AgNPs. By this approach, it is suggestive that this rapid synthesis of nanoparticles would be proper for developing a biological process for mosquito control.展开更多
文摘【目的】研究季节性冻融期土壤细菌和真菌数量的影响因素。【方法】采集中国知网、Web of science等数据库相关土壤季节性冻融期的数据,根据排除和纳入标准,采用Newcastle-Ottawa Scale(NOS)评价标准对文献进行质量评价,将得分≥6分且高质量的文献纳入研究,运用RevMan5.4对其进行Meta分析。【结果】42篇文献符合纳入标准,其中,SCI文章7篇,CSCD文章27篇。季节性冻融期土壤含水量对土壤细菌的影响显著性最大;土壤pH值对土壤真菌的影响显著性最大,土壤有机质对土壤细菌和真菌影响显著性最小。季节性冻融期,土壤有机氮对土壤细菌影响的优势程度最大,土壤含水量对土壤真菌影响的优势程度最大。【结论】季节性冻融期土壤pH值和土壤含水量对土壤细菌和真菌起到决定性作用。
基金The present work was supported by Foundation of State Key Basic Research and Development Project(G1998051100),Beijing.
文摘From fermentation broth of soil fungus 254-2 obtained from Yunnan province, a new macrocylic trichochecene was isolated. The structure was determined on the basis of spectroscopic evidences especially the 2-D NMR spectra.
文摘Here, we have synthesized the silver nanoparticles (AgNPs) by using the soil fungus Aspergillus niger 2587. The results recorded from UV-vis spectrophotometer and transmission electron microscopy (TEM) support the biosynthesis and characterization of AgNPs. The synthesized silver nanoparticles have also been tested against the larvae and pupae of Anopheles stephensi, Culex quinquefasciatus and Aedes aegypti. The efficacy test was performed at different concentrations for a period of different hours by the probit analysis. The larvae of Cx. quinquefasciatus have shown the 100% mortality to the synthesized AgNPs after 1 h of exposure, while the larvae of An. stephensi and Ae. aegypti were found less susceptible to the synthesized AgNPs. The pupa of Ae. aegypti has shown the efficacy LC50 4, LC90 12 and LC99 19 ppm after 2 h of exposure of the synthesized AgNPs, while, the pupae of Cx. quinquefasciatus and An. stephensi were found less susceptible to the synthesized AgNPs. By this approach, it is suggestive that this rapid synthesis of nanoparticles would be proper for developing a biological process for mosquito control.
