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Evolution of Biofilm and Its Effect on Microstructure of Mortar Surfaces in Simulated Seawater

Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 234-243页

作者：荣辉 YU Chenglong 张颖 School of Materials Science and Engineering Tianjin Chengjian UniversityTianjin 300384China Tianjin Key Laboratory of Building Green Functional Materials Tianjin Chengjian UniversityTianjin 300384China

To explore the role of biofilm formation on the corrosion of marine concrete structures, we investigated the attachment of biofilm on mortar surfaces in simulated seawater and the influence of biofilm on the microstructure of mortar surfaces. The results show that the evolution of biofilm on mortar surfaces in simulated seawater is closely related to the corrosion suffered by the mortar, and the process of biofilm attachment and shedding is continuous and cyclical. It is found that the specimens in the absence of biofilm attachment are more severely eroded internally by the corrosive medium in simulated seawater than those in the presence of biofilm attachment. For the specimens without biofilm attachment, after 60 days, gypsum forms,and after 120 days, the number of pores in the mortar is reduced. In contrast, for the specimens in the presence of biofilm attachment, gypsum could only be detected after 90 days, and fewer pores are filled. Therefore, the formation of biofilm could delay the invasion of the corrosive medium into the interior of mortar during the evolution of biofilm on mortar surfaces, mitigating the corrosion of mortars in seawater.

关键词： biofilm attachment mortar sulfur-oxidizing bacteria gypsum simulated seawater microstructure

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Lipids of sulfate-reducing bacteria and sulfur-oxidizing bacteria found in the Dongsheng uranium deposit

Lipids of sulfate-reducing bacteria and sulfur-oxidizing bac...

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中国科学院地质与地球物理研究所2012年度（第12届）...

作者： JIANG Lei CAI ChunFang ZHANG YongDong MAO ShengYi SUN YongGe LI KaiKai XIANG Lei ZHANG ChunMing Key Laboratory of Petroleum Resources Research Institute of Geology and Geophysics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Slate Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Stale Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Department of Earth Science Zhejiang University Department of Geochemistry Yangtze University

U-bearing sandstones from the Dongsheng deposit in Ordos Basin contain abundant C-C fatty acids.The fatty acids may have been derived from modern and ancient organisms including organisms from the intervals of U mineralization.A certain amount of i15:0,a15:0,a17:0 fatty acids coexist with small amounts of i17:1ω7c and 10me16:0,characteristic biomarkers of Desulfovibrio and Desulfobacler sp.,respectively.This indicates the existence of sulfate-reducing bacteria(SRB) in the sandstones.The presence of sulfur-oxidizing bacteria(SOB),such as Beggiatoa and Thioploca,is indicated by significant amounts of 16:1ω7c and 18:1ω7c fatty acids.The existence of the SRB in the deposit,as inferred from the fatly acids,is consistent with results from fossilized microorganisms and isotopic compositions of ore-stage pyrite.This suggests that the environment may have been favorable for the SRB to grow since ore formation(9.8-22 Ma).The bacteria may have degraded hydrocarbons directly,or indirectly utilized hydrocarbons degraded by oxic microbes in the deposits.This process may have produced C-rich calcite and prominent baseline humps of unresolved complex mixtures(UCM),and 25-demethylated hopanes and tricyclic terpanes.The existence of sulfur-oxidizing bacteria and sulfate-reducing bacteria in the deposit may have resulted in bacterial sulfate reduction to sulfide, re-oxidization of the sulfide to sulfate and subsequent reduction of the sulfate to sulfide.This assertion is supported by ore-stage pyrite withδS values as low as -39.2‰,and the lightest sulfate(about 11‰) measured during the Phanerozoic,a difference of more than 46‰.

关键词： fatty acids sulfatc-rcducing bacteria sulfur-oxidizing bacteria anaerobic oxidation of petroleum Dongshcng uranium deposit Ordos Basin

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sulfur dioxide and o-xylene co-treatment in biofilter：Performance, bacterial populations and bioaerosols emissions

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Journal of Environmental Sciences 2018年第7期30卷 41-51页

作者： Yongli Sun Song Xue Lin Li Wenjie Ding Junxin Liu Yunping Han Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China National Engineering Research Center for Urban Water & Wastewater Tianjin 300074 China University of Chinese Academy of Sciences Beijing 100049 China

sulfur dioxide（SO_2） and benzene homologs are frequently present in the off-gas during the process of sewage sludge drying. A laboratory scale biofilter was set up to co-treat SO_2 and o-xylene in the present study. SO_2 and o-xylene could be removed simultaneously in a single biofilter. Their concentration ratio in the inlet stream influenced the removal efficiencies. It is worth noting that the removal of SO_2 could be enhanced when low concentrations of o-xylene were introduced into the biofilter. Pseudomonas sp., Paenibacillus sp., and Bacillus sp. were the main functional bacteria groups in the biofilter. sulfur-oxidizing bacteria（SOB） and o-xylene-degrading bacteria（XB） thrived in the biofilter and their counts as well as their growth rate increased with the increase in amount of SO2 and o-xylene supplied. The microbial populations differed in counts and species due to the properties and components of the compounds being treated in the biofilter. The presence of mixed substrates enhanced the diversity of the microbial population. During the treatment process, bioaerosols including potentially pathogenic bacteria, e.g., Acinetobacter lwoffii and Aeromonas sp., were emitted from the biofilter. Further investigation is needed to focus on the potential hazards caused by the bioaerosols emitted from waste gas treatment bioreactors.

关键词： Off-gas treatment Biofilter sulfur-oxidizing bacteria o-Xylene-degrading bacteria Bioaerosols Pathogens

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An alternative model for fetal loss disorders associated with mare reproductive loss syndrome

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Animal Nutrition 2020年第2期6卷 217-224页

作者： Thomas W.Swerczek Department of Veterinary Science University of KentuckyLexingtonKY40356United States

Fertile chicken eggs were used as an alternative model for large animals to evaluate suspect toxic dietary ingredients for fetal loss disorders associated with mare reproductive loss syndrome(MRLS) and fetal losses in other livestock.Nitrate,ammonia,and sulfate may react with proteinaceous compounds to enable the formation of abiotic pathogenic nanoparticles which were constant findings in pathognomonic placental lesions associated with non-infectious fetal losses of previously unknown etiology in mares,chickens and other livestock.The pathogenic nanoparticles may be produced naturally by toxic elements associated with air pollution that affect pasture forages or crops,uninte ntionally by reactions of these elements in protein-mineral mixes in dietary rations,or endogenously within tissues of fetuses and adult animals.The nanoparticles may form niduses in small vessels and predispose animals to a host of secondary opportunistic diseases affecting the reproductive,respiratory and gastrointestinal tracts of animals.The newly recognized abiotic pathogenic micro and nanoparticles are associated with MRLS.The discovery of the pathogenic nanoparticles led to the identification of nitrate,ammonium,and sulfur,in the form of sulfate,that seemingly enable the formation of the pathogenic nanoparticles in embryonic and fetal tissues.

关键词： Fetal loss High-protein diet Nitrate toxicity Sulfate toxicity sulfur-oxidizing bacteria Pathogenic nanoparticle

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