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Exogenous Protein as an Environmental Stimulus of Biofilm Formation in Select Bacterial Strains

Advances in Microbiology 2020年第3期10卷 123-144页

作者： donna ye Lekha Bapu Mariane Mota Cavalcante Jesse Kato Maggie Lauria Sneideman Kim Scribner Thomas Loch Terence L. Marsh Department of Microbiology and Molecular Genetics Michigan State University East Lansing MI USA Department of Biology Universidade Federal de São Carlos Sorocaba SP Brazil Department of Biology Kalamazoo College Kalamazoo MI USA Department of Fisheries and Wildlife Michigan State University East Lansing MI USA

A screening of environmental conditions that would elicit robust biofilm in a collection of Serratia marcescens isolated from soil revealed that exogenous milk protein increased biofilm productivity up to ten-fold. A select screening of fish pathogens, freshwater and human isolates identified several other species that responded similarly to exogenous protein. The optimal protein concentration was species specific;S. marcescens at 5% milk protein, Aeromonas sp. at 2% - 3%, Flavobacterium columnare at 1% and Pseudomonas aeruginosa at 0.1% - 0.4%. Media supplemented with milk protein also increased the cell counts in biofilm as well as the protein incorporated into the biofilm matrix. These data suggest that relatively high concentrations of exogenous protein may serve as an environmental trigger for biofilm formation, particularly for pathogenic bacteria exposed to relatively high concentrations of protein in bodily fluids and mucosal surfaces.

关键词： Biofilm Environmental Stimulus Exogenous Protein Serratia marcescens Aeromonas sp. Flavobacterium columnare

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Relating Cd2+binding by humic acids to molecular weight:A modeling and spectroscopic study

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Journal of Environmental Sciences 2018年第8期30卷 154-165页

作者： Hongcheng Bai Zhenmao Jiang Minjin He Biying ye Shiqiang Wei College of Resources and Environment Department of Environment Science and EngineeringSouthwest UniversityChongqing 400715China Chongqing Key Laboratory of Agricultural Resources and Environment Chongqing 400715China China Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment Ministry of EducationChongqing 400715China

Molecular weight（Mw） is a fundamental property of humic acids（HAs）, which considerably affect the mobility and speciation of heavy metals in the environment. In this study, soil humic acid（HA） extracted from Jinyun Mountain, Chongqing was ultra-filtered into four fractions according to the molecular weight, and their properties were *** of cadmium was investigated by titration experiments. For the first time,Langmuir and non-ideal competitive adsorption-donna（NICA-donnan） models combined with fluorescence excitation-emission matrix（EEM） quenching were employed to elucidate the binding characteristics of individual Mw fractions of HA. The results showed that the concentration of acidic functional groups decreased with increasing Mw, especially the phenolic groups. The humification degree and aliphaticity increased with increasing Mw as indicated by elemental composition analysis and FT-IR spectra. The binding capacity of Cd2＋ to Mw fractions of HA followed the order UF1（〈 5 kDa）〉 UF2（5–10 kDa）〉 UF4（〉 30 kDa）〉 UF3（10–30 kDa）. Moreover, the distribution of cadmium speciation indicated that the phenolic groups were responsible for the variations in binding of Cd2＋ among different Mw fractions. The results of fluorescence quenching illustrated that the binding capacity of Cd2＋ to Mw fractions was controlled by the content of functional groups, while the binding affinity was largely influenced by structural factors. The results provide a better understanding of the roles that different HA Mw fractions play in heavy metal binding,which has important implications in the control of heavy metal migration and bio-toxicity.

关键词： Humic acid Molecular weight NICA-donnan Fluorescence excitation-emission matrix quenching Cadmium

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含氟地下水饮用处理技术

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地下水 2007年第5期29卷 85-86,142页

作者：李莉王业耀孟凡生中国环境科学研究院北京100012

目前,高氟地下水和地方性氟中毒是世界范围内的一个难题,为解决这一问题,世界各国科研人员进行了大量的试验研究,总结出了不少成功的处理方法。综述前人对含氟地下水的各种处理技术,包括吸附法、沉淀法、电凝聚法、电渗析、donna渗析等... 详细信息

目前,高氟地下水和地方性氟中毒是世界范围内的一个难题,为解决这一问题,世界各国科研人员进行了大量的试验研究,总结出了不少成功的处理方法。综述前人对含氟地下水的各种处理技术,包括吸附法、沉淀法、电凝聚法、电渗析、donna渗析等,并对这些技术进行了总结和比较,以指导生产实践。

关键词：地下水饮用氟去除

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