共查询到19条相似文献，搜索用时 109 毫秒
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中药农药“必效散”对柑桔青霉病菌和绿霉病菌的抑制作用 总被引：1，自引：0，他引：1
报道了７种药剂对柑桔青霉病菌和绿霉病菌的生长抑制作用。通过比较供试药剂对柑桔两种致病菌的抑菌圈大小和抑制浓度,确定了它们的抑菌效果。试验结果表明,“必效散”是抑菌效果最好的药剂。 相似文献
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本文以射阳耦耕镇温室连作障碍的西葫芦为材料,对病株进行病原物的分离,初步鉴定出真菌性和细菌性2类病原物,其中,包括真菌性的蔓枯病菌、镰刀属枯萎病菌、疫霉病菌和细菌性的欧氏杆菌和黄单孢菌.本文准确地鉴定土传的连作障碍病原物,对于针对性地采用化学药剂控制设施瓜类蔬菜的病害有一定借鉴意义. 相似文献
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采用抑菌圈法,对施保克等10种化学药剂在枸杞炭疽病病原菌上进行室内毒力测定。结果发现施保克抑菌效果最好,多菌灵、炭疽灵次之,甲霜灵锰锌、百菌清和禾本卡克也有一定效果,其余几种化学药剂效果很差。 相似文献
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海州香薷目前已开始应用于环境修复,但其后续资源化问题一直未得到有效解决。本文探讨了海州香薷总黄酮的含量及其抑菌效果,希望能为后续资源化利用开发相应的抗菌剂产品提供参考。本研究采用超声波法提取海州香薷总黄酮,以Rutin作标样,510 nm波长条件下测定其含量。结果表明,海州香薷花期花枝总黄酮的含量高达90.56 mg.g-1,全草中总黄酮的含量达47.66 mg.g-1;海州香薷总黄酮提取液对番茄枯萎病菌、水稻纹枯病菌、芒果蒂腐病菌和茄腐镰刀病菌都有一定的抑菌效果,其中75%乙醇提取液对芒果蒂腐病菌效果最为显著,抑制率达到54.13%。 相似文献
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文秀保 《大科技．科学之谜》2014,(4):229-230
[目的】探究6种药剂对柑桔红蜘蛛的田间防效。[方法]以柑桔红蜘蛛植株为试验对象,测定了6种药剂对柑桔红蜘蛛的田问防效。[结果】试验结果表明：2000倍液25％三唑锡可湿性粉剂、2000倍液5％唑螨酯悬浮剂、2000倍液20％哒螨灵可湿性粉剂、1500倍液25％苯丁锡可湿性粉剂对柑桔红蜘蛛都有较好防效,且对柑桔的的生产具有安全性,适宜在生产上进行推广使用;而1000倍液20％氰菊酯乳油,2000倍液57％炔螨特乳油的药效不是很理想。 相似文献
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《大科技．科学之谜》2008,(3):32
关于恐龙的灭绝原因,人们给出了上千种答案,至今依然没有定论,虽然过去科学家也曾猜测病菌也许是杀死恐龙的凶手,不过却一直没有找到证据。最近,科学家研究了白垩纪晚期的琥珀化石,从中找到了恐龙灭绝的新线索。在当时的琥珀中,包裹了一些昆虫,在这些昆虫的身体上,科学家找到了一砦非常厉害的病菌,比如利什曼原虫的病原体和导致疟疾的病菌,这些病菌对恐龙这样的大型爬行动物具有相当大的杀伤力。 相似文献
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《大科技．科学之谜》2004,(8):34-34
为什么很多病菌可以抑制甚至破坏人的免疫功能?这是因为一些病菌窃取了他们主人体内一些关键性的防御基因,从而可以做到“知己知彼,百战不殆”。这是德国科学家最新公布的一项研究成果。在基因家族中,a2m基因是合成血液蛋白质的重要物质,这种基因及其同源基因分布在不同的动物中。它们有共同的作用,即保卫有机体,抵抗病菌的攻击。但是令人意想不到的是,在一次实验中,一个研究小组在病菌体内也观察到了这种基因。他们因此认为,病菌从多细胞性的有机体中窃取了a2m基因。此后,它们用获得的基因作“武器”,保护自己免受其宿主免疫系统的攻击,这… 相似文献
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采用海藻酸钙加活性炭的方法对一株染料脱色优势菌青霉X5进行固定化，并进行固定化菌的一般性质实验，特进行所需4种材料的最佳组合的正交试验，结果表明．四者合适比例为海藻酸钠(2％)，CaCl2(3％)，活性炭(2．5％)，菌量为40％，此法制得凝胶小球机械强度较好，经久耐用．固定化青霉X5脱色的最佳条件为：脱色时间为12h，培养温度为20℃，pH为3．0，染料浓度对菌的脱色有一定的影响．固定化小球可重复使用5次，5次后染料的脱色率为76．74％． 相似文献
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中国古代才妓是一个特殊的女性创作群体,由于其悲惨的生活经历、特殊的情感体验,她们的诗词作品主要是抒发个人情感的悲情之作。表达了她们对不幸遭遇的控诉,对爱情婚姻的追求,对人格自由的追求,呈现出忧郁、哀怨的风格情调。 相似文献
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A growing number of studies suggest that only innovative subsidiaries generate positive technological effects in host countries. In this context, this paper explores the variability in the intensity of innovative activity across MNC subsidiaries within a late-industrialising host economy in connection with two factors: the subsidiaries’ functional integration within (a) their global corporations and (b) their host economy. We found that the more innovative subsidiaries were those that enjoy integration to both the local economy and their global corporation. However, they represented a small proportion of all subsidiaries, most of which were disconnected from both their global corporation and the local economy. We also found that, in common with some findings in advanced country contexts, but in contrast to common expectations in industrialising economies, subsidiaries that were strongly integrated into their parent corporations undertook more, not less, intensive innovative activity than those that were well integrated into the host economy. 相似文献
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高校图书馆网站发展情况研究 总被引：1，自引：0，他引：1
通过对国内外多家高校图书馆网站发展情况的研究,展示了自高校图书馆网站出现以来取得的一系列进步,分析并讨论了高校图书馆网站发展过程中必须解决的问题. 相似文献
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《Information processing & management》2019,56(4):1494-1505
This study aims to explore the relationships between Instagram user characteristics and color features of their photos. Based on the assumption that individuals who are similar in characteristics would exhibit a similar style in their social media photos, this study pays attention to color as one of the key elements of style. An online survey to 179 university students measured their Big Five personality traits, narcissism, life satisfaction, loneliness, attitude to Instagram, and gender, and their Instagram photos were analyzed in terms of colorfulness, color diversity, and color harmony. Total 25,394 photos were analyzed. Results suggest that (1) agreeableness was the most relevant user variable associated with all color features; (2) the color features of Instagram photos were different by gender; (3) neuroticism of Instagram users was negatively associated with the color harmony of their photos; (4) color diversity was negatively correlated with loneliness, and romantic loneliness in particular; (5) users’ attitude to Instagram and the color harmony of their photos were positively correlated; and (6) extraversion of Instagram users was positively correlated with the color diversity while openness was negatively correlated with the color diversity and color harmony of their photos. They reveal that the color features of Instagram photos are linked to the characteristics of their uploader. The present study contributes to the body of research on color preference and online self-presentation. It not only exemplifies how the stylometric approach can be adopted to SNS research but also presents the link between user characteristics and the features of their posts at pixel-level, including color. 相似文献
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The article focuses on the social workers’ workarounds aka their own alternative strategies for defeating the various types of obstacles in information interaction in a client information system (CIS). Data consists of semi-structured interviews and social workers’ observations with their verbal accounts while they used CIS in their daily work. The workarounds were analyzed from the process perspective when antecedent conditions, actual workarounds and their consequences were taken into account. The design flaws and external demands in work generated the workarounds. The social workers used small scale tricks within CIS to maintain continuum in a client’s trajectory; they relied on shadow systems to manage their whole clientele; and took shortcuts in production of statistical information. The workarounds offered a better grip on information and saved time. However, some of the workarounds were tensional in a child protection context. The analysis of workarounds provided valuable secondary design suggestions to remedy CIS. 相似文献
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中国各省份经济发展水平不同,其CO2排放也存在很大的空间差异。作者认为碳排放的区域差异不应只体现在其绝对排放数量上,更要体现在其与社会、经济和生态的兼容度差异上。因此本文首先运用IPCC2006清单法计算出了2010年中国各省份碳排放数量,然后对之进行了空间差异分析。接着在综合考虑碳排放的生态、公平和效率前提下,尝试性地构建了碳排放区域差异的3E模型体系,并用之进行了具体计算。结果表明,虽然广东、湖北、四川和黑龙江等省的碳排放绝对量大,但这些省份的Y3E值均大于1,表明这些区域的碳汇能力很强,无论从生态、公平还是从效率的角度来说其碳排放都是在其省域的生态承载范畴之内。由此证明新构建的3E模型对中国碳排放区域差异研究是有益的参考和补充。 相似文献