共查询到17条相似文献,搜索用时 125 毫秒
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附着于表面的微生物(生物膜)是水处理工业面临的许多问题的原因之一,例如增加传热阻力、填料膜污染、微生物引起的腐蚀(MIC)等。这些问题将导致运行成本提高、维护、管理等工作的增加。此外,生物膜还可对致病微生物提供适宜的繁殖环境.本文提供对生物膜控制战略的了解。小试和中试研究表明,各种工业杀生剂对生物膜和附着干表面的微生物的控制能力差别很大,另一些研究表明,某些不属于水处理人员直接控制的因素,如系统温度、流速和设各材质都可对生物膜的生长和杀生剂的作用产生影响。本文旨在从几个不同方面讨论附着于表面的微生物的控制,评述其控制对策,即杀生剂、生物分散剂和酶的应用,讨论防止微生物繁殖的未来技术。为水处理专业人员提供有关控制方面的综合述评。 相似文献
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微生物腐蚀给各行各业带来了巨大的经济损失.目前对单一菌种的腐蚀机理有了广泛深刻的认识,但实际环境中微生物以群落形式存在,单一菌种的腐蚀机制并不能完全解释实际环境中的腐蚀现象.混合微生物腐蚀机制的研究已成为腐蚀领域研究的新方向.本文从群落角度出发,着重讨论了环境因素如管道材料、营养物质、溶解氧、温度和pH对微生物群落的影... 相似文献
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针对浮游球衣菌的生物膜试验了次氯酸、次溴酸和卤素供体BCMEH(溴氯甲乙基海因)。应该指出,浮游球衣菌可形成强健的丝状生物膜,这种生物膜是很耐杀生剂处理的。采用非破坏性生物膜监测技术(传热阻力和溶解氧浓度)表明了在如下的 相似文献
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与表面相关的微生物(生物膜)是水处理工业面临的许多问题之一。生物膜可增加传热阻力、污染膜填料和导致微生物引起的腐蚀(MIC)等,结果使系统运行成本提高,增加维护管理工作量。此外,生物膜还可对致病微生物提供适宜的繁殖环境。实验室和中试设备研究表明,各种工业杀生剂对生物膜和与表面相关的微生物的控制能力差别很大。另一些研究表明,某些不属于水处理专业人员控制的因素,如系统温度、流速和结构材料都可对生物膜的生长和杀生剂的作用产生影响。作者旨在从几个不同方面讨论与表面相关的微生物的控制,评述控制战略,即杀生剂、生物分散… 相似文献
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用恒电位法研究了在硫酸盐体系中电沉积N i-W-P合金时的阴极极化行为,得出在镀液中不同组分对阴极极化的影响不同,加入H8C6O7可提高阴极极化,加入N aH2PO2.H2O可使极化减小,对二次电流的分布不利,在保证镀层中磷含量的前提下,应尽量减小N aH2PO2.H2O的含量。 相似文献
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Adhesion of a cathodically electrodeposited paint (E-coat) to aluminum alloys, Alclad 2024-T3, AA 2024-T3 and AA 7075-T6, was investigated to examine the influence of interfacial tension at the paint/metal interface. The surface energy of an aluminum plate was modified by depositing a plasma polymer of a mixture of trimethyl silane (TMS) and one of three diatomic gases (O2, N2, and H2) by cathodic plasma polymerization. The contact angle (Φ) of water on a modified surface changes as a function of the mole fraction of the diatomic gas. The plot of cos ΦPP of a plasma polymer as a function of the mole fraction of the gas crosses the plot of cosΦEC of the E-coat. The difference, ΔCosΦ = cos ΦPP - cosΦEC, is a parameter which indicates the level of interfacial tension at the paint/metal interface. ΔCosΦ = 0 represents the minimum interfacial tension. The adhesion of a cured E-coat on a panel was evaluated by the N-methyl pyrrolidinone (NMP) paint delamination time test. The maximum peak of adhesion test values plotted as a function of ΔCosΦ occurred around the zero point. ΔCos Φ = 0, indicating that maximum adhesion is obtained with minimum interfacial tension. Mixtures of TMS and N2 on all three aluminum alloys studied consistently displayed longer delamination times in the NMP test than mixtures of TMS and O2 or H2. 相似文献
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Adhesion of a cathodically electrodeposited paint (E-coat) to aluminum alloys, Alclad 2024-T3, AA 2024-T3 and AA 7075-T6, was investigated to examine the influence of interfacial tension at the paint/metal interface. The surface energy of an aluminum plate was modified by depositing a plasma polymer of a mixture of trimethyl silane (TMS) and one of three diatomic gases (O2, N2, and H2) by cathodic plasma polymerization. The contact angle (Φ) of water on a modified surface changes as a function of the mole fraction of the diatomic gas. The plot of cos ΦPP of a plasma polymer as a function of the mole fraction of the gas crosses the plot of cosΦEC of the E-coat. The difference, ΔCosΦ = cos ΦPP - cosΦEC, is a parameter which indicates the level of interfacial tension at the paint/metal interface. ΔCosΦ = 0 represents the minimum interfacial tension. The adhesion of a cured E-coat on a panel was evaluated by the N-methyl pyrrolidinone (NMP) paint delamination time test. The maximum peak of adhesion test values plotted as a function of ΔCosΦ occurred around the zero point. ΔCos Φ = 0, indicating that maximum adhesion is obtained with minimum interfacial tension. Mixtures of TMS and N2 on all three aluminum alloys studied consistently displayed longer delamination times in the NMP test than mixtures of TMS and O2 or H2. 相似文献
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Specific Maltose Derivatives Modulate the Swarming Motility of Nonswarming Mutant and Inhibit Bacterial Adhesion and Biofilm Formation by Pseudomonas aeruginosa 下载免费PDF全文
Gauri S. Shetye Nischal Singh Changqing Jia Chan D. K. Nguyen Dr. Guirong Wang Dr. Yan‐Yeung Luk 《Chembiochem : a European journal of chemical biology》2014,15(10):1514-1523
We have demonstrated that specific synthetic maltose derivatives activate the swarming motility of a Pseudomonas aeruginosa nonswarming mutant (rhlA) at low concentration, but inhibit it at high concentration. Although these molecules are not microbicidal, active maltose derivatives with bulky hydrocarbon groups inhibited bacterial adhesion, and exhibited biofilm inhibition and dispersion (IC50 ~20 μM and DC50 ~30 μM , respectively). Because the swarming motility of the rhlA mutant is abolished by the lack natural rhamnolipids, the swarming activation suggests that maltose derivatives are analogues of rhamnolipids. Together, these results suggest a new approach of controlling multiple bacterial activities (bacterial adhesion, biofilm formation, and swarming motility) by a set of disaccharide‐based molecules. 相似文献
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为进一步提高镍基电极的析氢性能,采用恒电位沉积法,通过改变镀液中各合金的质量浓度比、沉积电位、沉积时间等条件,制备出一种高活性的镍钴铁三元合金电极。通过测定电极在1 mol/L的NaOH溶液中的极化曲线,得到最佳的沉积工艺条件为:36.25 g/L NiSO_4·6H_2O,1.25 g/L NiCl_2·6H_2O,5 g/L CoSO_4·7H_2O,7.5 g/L FeSO_4·7H_2O,10 g/L H_3BO_3,0.5 g/L抗坏血酸,1 g/L十二烷基硫酸钠,pH=4.0,电沉积电位-1.45 V,电沉积时间300 s。阴极极化曲线测试结果表明在5 A/dm^2的条件下,镍钴铁三元合金电极的析氢过电位降低至121 mV,相比于纯镍电极过电位降低近50%,相比于镍钴电极过电位降低近35%。 相似文献