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《南京农业大学学报》2017,(4)
[目的]本研究旨在从南极土壤中筛选防治玉米细菌性褐腐病的芽孢杆菌菌株,为该病害的防治提供菌株资源。[方法]从南极长城站地震台附近的企鹅聚居地土壤中分离芽孢杆菌。结合16S rDNA及gyr B基因序列对分离到的芽孢杆菌进行鉴定。借助平板抑菌试验筛选对玉米细菌性褐腐病病原菌具有拮抗效果的生防芽孢杆菌。通过田间防治试验,筛选具有较好生防效果的芽孢杆菌。利用MALDI-TOF-MS对芽孢杆菌产生的抗菌物质脂肽化合物进行鉴定。[结果]通过16S rDNA及gyr B基因序列对分离自南极的23株芽孢杆菌进行鉴定,其中解淀粉芽孢杆菌(Bacillus amyloliquefaciens)9株,地衣芽孢杆菌(Bacillus licheniformis)14株。借助平板抑菌试验,筛选获得抑菌效果明显的2株B.amyloliquefaciens菌株EZ15-07、EZ15-09和2株B.licheniformis菌株EZ01-05、EZ15-08。田间试验结果表明,菌株EZ15-07和EZ01-05对玉米细菌性褐腐病的防治效果分别为59.3%和55.3%。对这2个菌株发酵液的MALDI-TOF-MS检测表明,菌株EZ15-07能产生Surfactin和Bacillomycin D 2种脂肽化合物,菌株EZ01-05能产生Bacillomycin D和Fengycin 2种脂肽化合物。[结论]由南极土壤分离获得的菌株EZ15-07和EZ01-05对玉米细菌性褐腐病防治效果显著,2个菌株均具有较好的田间应用潜力。 相似文献
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老年人对城市公园绿地的需求规律与特征探析 总被引:2,自引:0,他引:2
老年人在公园绿地的活动受行为能力影响较多.分析了老年人的心理、生理特征及其对公园绿地的需求,阐述了老年人在公园绿地中由自发性活动逐渐引发向社会性活动基本规律.重点是基于对南京城市绿地的调查,掌握了老年人在公园绿地中的活动内容,以及老年人活动群体性、参与性、场所性、时间性等特征.对公园绿地新建和改造具有一定的实践指导意义. 相似文献
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目的 了解围绝经期女性体力活动水平情况.方法 用国际体力活动问卷对东莞市区246名围绝经期女性进行调查,并计算体力活动强度.结果 240名围绝经期女性中,体力活动为高水平、中等水平、不足者分别占38.8%、55.8%、5.4%.工作、交通出行、家务园艺、休闲相关体力活动的中位数分别是840、657、597、313.体力活动充足妇女的BMI值(21.82)低于体力活动不足者(23.87).体力活动强度随着体质量增加逐渐降低.结论 东莞市区围绝经期妇女体力活动水平较高,体力活动强度随体质量增加而逐渐减少. 相似文献
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5月20~26日,由安宁市科技局牵头,市委宣传部和市科协协办,以“携手建设创新型国家——建设创新型城市”为主题的2006年“科技活动周”宣传活动. 相似文献
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(接330期)
三、对农协成员的教育活动
农协成员教育是以参加农协组织的农民(包括其家属)为对象的教育活动.为了达到统一认识,提高广大农民的专业技术水平,加强对合作经济活动的参与和支持,农协所开展的各种教育活动都应遵守实用性、趣味性这两个基本原则. 相似文献
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全国上下学雷锋活动蓬勃开展,长盛不衰.新形势下推动大学生学雷锋活动向纵深发展具有重要意义.高校及大学生应深刻领会当前学雷锋活动的时代内涵及实践要求,并且需要采取有力措施推动大学生学雷锋活动更加深入发展并取得更大成效. 相似文献
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Effects of cellulase and xylanase enzymes mixed with increasing doses of Salix babylonica extract on in vitro rumen gas production kinetics of a mixture of corn silage with concentrate 下载免费PDF全文
Abdelfattah Z M Salem German Buendía-Rodríguez Mona M M Elgh our María A Mariezcurrena Berasain Francisco J Pe?a Jiménez Alberto B Pliego Juan C V Chagoyán María A Cerrillo Miguel A Rodríguez 《农业科学学报》2015,14(1):131-139
An in vitro gas production(GP) technique was used to investigate the effects of combining different doses of Salix babylonica extract(SB) with exogenous fibrolytic enzymes(EZ) based on xylanase(X) and cellulase(C), or their mixture(XC; 1:1 v/v) on in vitro fermentation characteristics of a total mixed ration of corn silage and concentrate mixture(50:50, w/w) as substrate. Four levels of SB(0, 0.6, 1.2 and 1.8 m L g–1 dry matter(DM)) and four supplemental styles of EZ(1 μL g–1 DM; control(no enzymes), X, C and XC(1:1, v/v) were used in a 4×4 factorial arrangement. In vitro GP(m L g–1 DM) were recorded at 2, 4, 6, 8, 10, 12, 24, 36, 48 and 72 h of incubation. After 72 h, the incubation process was stopped and supernatant p H was determined, and then filtered to determine dry matter degradability(DMD). Fermentation parameters, such as the 24 h gas yield(GY24), in vitro organic matter digestibility(OMD), metabolizable energy(ME), short chain fatty acid concentrations(SCFA), and microbial crude protein production(MCP) were also estimated. Results indicated that there was a SB?EZ interaction(P0.0001) for the asymptotic gas production(b), the rate of gas production(c), GP from 6 to 72 h, GP2(P=0.0095), and GP4(P=0.02). The SB and different combination of enzymes supplementation influenced(P0.001) in vitro GP parameters after 12 h of incubation; the highest doses of SB(i.e., 1.8 m L g–1 DM), in the absence of any EZ, quadratically increased(P0.05) the initial delay before GP begins(L) and GP at different incubation times, with lowering b(quadratic effect, P0.0001) and c(quadratic effect, P0.0001; linear effect, P=0.0018). The GP was the lowest(P0.05) when the highest SB level was combined with cellulose. There were SB?EZ interactions(P0.001) for OMD, ME, the partitioning factor at 72 h of incubation(PF72), GY24, SCFA, MCP(P=0.0143), and p H(P=0.0008). The OMD, ME, GY24 and SCFA with supp lementation of SB extract at 1.8 m L g–1 DM were higher(P0.001) than the other treatments, however,PF72 was lower(quadratic effect, P=0.0194) than the other levels. Both C and X had no effect(P0.05) on OMD, p H, ME, GY24, SCFA and MP. The combination of SB with EZ increased(P0.001) OMD, ME, SCFA, PF72 and GP24, whereas there was no impact on p H. It could be concluded that addition of SB extract, C, and X effectively improved the in vitro rumen fermentation, and the combination of enzyme with SB extract at the level of 1.2 m L g–1 was more effective than the other treatments. 相似文献