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bacterial corrosion

Gaoqiang Xu, Xinkun Shen, Liangliang Dai, Qichun Ran, Pingping Ma, Kaiyong Cai
Bacterial infection is one of the most severe postoperative complications leading to implantation failure. The early bacterial stage (4-6h) was proved to be the "decisive period" for long-term bacteria-related infection. Thus, to endow potential early antibacterial capacity for a titanium (Ti) based implant, an effective antiseptic agent of octenidine dihydrochloride (OCT) was effectively loaded on the mesoporous silica nanoparticles (MSNs)-incorporated titania coating which was fabricated by an electrophoretic-enhanced micro-arc oxidation technique...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Shadi Lalezari, Christine J Lee, Anna A Borovikova, Derek A Banyard, Keyianoosh Z Paydar, Garrett A Wirth, Alan D Widgerow
Since its introduction 20 years ago for the treatment of chronic wounds, negative pressure wound therapy use has expanded to a variety of other wound types. Various mechanisms of action for its efficacy in wound healing have been postulated, but no unifying theory exists. Proposed mechanisms include induction of perfusion changes, microdeformation, macrodeformation, exudate control and decreasing the bacterial load in the wound. We surmise that these different mechanisms have varying levels of dominance in each wound type...
September 29, 2016: International Wound Journal
Fang Guan, Xiaofan Zhai, Jizhou Duan, Meixia Zhang, Baorong Hou
Certain species of sulfate-reducing bacteria (SRB) use cathodes as electron donors for metabolism, and this electron transfer process may influence the proper protection potential choice for structures. The interaction between SRB and polarized electrodes had been the focus of numerous investigations. In this paper, the impact of cathodic protection (CP) on Desulfovibrio caledoniens metabolic activity and its influence on highs trength steel EQ70 were studied by bacterial analyses and electrochemical measurements...
2016: PloS One
Roohi Bansal, Navdeep Kaur Dhami, Abhijit Mukherjee, M Sudhakara Reddy
Microbial carbonate precipitation has emerged as a promising technology for remediation and restoration of concrete structures. Deterioration of reinforced concrete structures in marine environments is a major concern due to chloride-induced corrosion. In the current study, halophilic bacteria Exiguobacterium mexicanum was isolated from sea water and tested for biomineralization potential under different salt stress conditions. The growth, urease and carbonic anhydrase production significantly increased under salt stress conditions...
November 2016: Journal of Industrial Microbiology & Biotechnology
Yang Li, Lina Liu, Peng Wan, Zanjing Zhai, Zhenyang Mao, Zhengxiao Ouyang, Degang Yu, Qi Sun, Lili Tan, Ling Ren, Zhenan Zhu, Yongqiang Hao, Xinhua Qu, Ke Yang, Kerong Dai
Treatment of chronic osteomyelitis (bone infection) remains a clinical challenge; in particular, it requires an implantable material with improved antibacterial activity. Here, we prepared biodegradable magnesium (Mg)-copper (Cu) alloys with different Cu contents (0.05, 0.1, and 0.25 wt%) and assessed their potential for treating methicillin-resistant Staphylococcus aureus-induced osteomyelitis. We evaluated the microstructures, mechanical properties, corrosion behavior, and ion release of the alloys in vitro, and their biocompatibility and antibacterial activity in vitro and in vivo...
November 2016: Biomaterials
Sanly Liu, Cindy Gunawan, Nicolas Barraud, Scott A Rice, Elizabeth J Harry, Rose Amal
In drinking water distribution systems (DWDS), biofilms are the predominant mode of microbial growth, with the presence of extracellular polymeric substance (EPS) protecting the biomass from environmental and shear stresses. Biofilm formation poses a significant problem to the drinking water industry as a potential source of bacterial contamination, including pathogens, and, in many cases, also affecting the taste and odor of drinking water and promoting the corrosion of pipes. This article critically reviews important research findings on biofilm growth in DWDS, examining the factors affecting their formation and characteristics as well as the various technologies to characterize and monitor and, ultimately, to control their growth...
September 6, 2016: Environmental Science & Technology
Mary Theresa Callahan, Sasha C Marine, Kathryne L Everts, Shirley A Micallef
Irrigation water distribution systems are used to supply water to produce crops, but the system may also provide a protected environment for the growth of human pathogens present in irrigation water. In this study, the effects of drip tape installation depth and sanitization on the microbial quality of irrigation groundwater were evaluated. Drip tape lines were installed on the soil surface or 5 or 10 cm below the soil surface. Water samples were collected from the irrigation source and the end of each drip line every 2 weeks over an 11-week period, and the levels of Escherichia coli, total coliforms, aerobic mesophilic bacteria, and enterococci were quantified...
June 2016: Journal of Food Protection
Leila Abdoli, Xinkun Suo, Hua Li
Formation of biofilm is usually essential for the development of biofouling and crucially impacts the corrosion of marine structures. Here we report the attachment behaviors of Bacillus sp. bacteria and subsequent formation of bacterial biofilm on stainless steel and thermal sprayed aluminum coatings in artificial seawater. The colonized bacteria accelerate the corrosion of the steel plates, and markedly enhance the anti-corrosion performances of the Al coatings in early growth stage of the bacterial biofilm...
September 1, 2016: Colloids and Surfaces. B, Biointerfaces
Juliana Pacheco da Rosa, Samyra Raquel Gonçalves Tibúrcio, Joana Montezano Marques, Lucy Seldin, Rosalie Reed Rodrigues Coelho
Streptomyces lunalinharesii strain 235 produces an antimicrobial substance that is active against sulfate reducing bacteria, the major bacterial group responsible for biofilm formation and biocorrosion in petroleum reservoirs. The use of this antimicrobial substance for sulfate reducing bacteria control is therefore a promising alternative to chemical biocides. In this study the antimicrobial substance did not interfere with the biofilm stability, but the sulfate reducing bacteria biofilm formation was six-fold smaller in carbon steel coupons treated with the antimicrobial substance when compared to the untreated control...
July 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
Joyce M McBeth, David Emerson
Microbiologically influenced corrosion (MIC) is a complex biogeochemical process involving interactions between microbes, metals, minerals, and their environment. We hypothesized that sediment-derived iron-oxidizing bacteria (FeOB) would colonize and become numerically abundant on steel surfaces incubated in coastal marine environments. To test this, steel coupons were incubated on sediments over 40 days, and samples were taken at regular intervals to examine microbial community succession. The experiments were conducted at two locations: (1) a brackish salt marsh stream and (2) a coastal marine bay...
2016: Frontiers in Microbiology
Parisa Moazzam, Amir Razmjou, Mohsen Golabi, Dariush Shokri, Amir Landarani-Isfahani
Bacterial adhesion and subsequent biofilm formation on metals such as aluminum (Al) alloys lead to serious issues in biomedical and industrial fields from both an economical and health perspective. Here, we showed that a careful manipulation of Al surface characteristics via a facile two-steps superhydrophobic modification can provide not only biocompatibility and an ability to control protein adsorption and bacterial adhesion, but also address the issue of apparent long-term toxicity of Al-alloys. To find out the roles of surface characteristics, surface modification and protein adsorption on microbial adhesion and biofilm formation, the surfaces were systematically characterized by SEM, EDX, XPS, AFM, FTIR, water contact angle (WCA) goniometry, surface free energy (SFE) measurement, MTT, Bradford, Lowry and microtiter plate assays and also flow-cytometry and potentiostat analyses...
September 2016: Journal of Biomedical Materials Research. Part A
Hakimullah Hakim, Md Shahin Alam, Natthanan Sangsriratanakul, Katsuhiro Nakajima, Minori Kitazawa, Mari Ota, Chiharu Toyofuku, Masashi Yamada, Chanathip Thammakarn, Dany Shoham, Kazuaki Takehara
The capacity of slightly acidic hypochlorous acid water (SAHW), in both liquid and spray form, to inactivate bacteria was evaluated as a potential candidate for biosecurity enhancement in poultry production. SAHW (containing 50 or 100 ppm chlorine, pH 6) was able to inactivate Escherichia coli and Salmonella Infantis in liquid to below detectable levels (≤2.6 log10 CFU/ml) within 5 sec of exposure. In addition, SAHW antibacterial capacity was evaluated by spraying it using a nebulizer into a box containing these bacteria, which were present on the surfaces of glass plates and rayon sheets...
August 1, 2016: Journal of Veterinary Medical Science
Hongqing Feng, Guomin Wang, Weihong Jin, Xuming Zhang, Yifan Huang, Ang Gao, Hao Wu, Guosong Wu, Paul K Chu
Magnesium-based materials are preferred in temporary orthopedic implants because of their biodegradability, mechanical properties, and intrinsic antibacterial properties. However, the fundamental mechanism of bacteria killing and roles of various factors are not clearly understood. In this study, we performed a systematic study of the antibacterial properties of two common Mg-based materials using a biofilm forming bacterium. Complete annihilation of the initial 3 × 10(4) bacteria is achieved with both materials in 0...
April 20, 2016: ACS Applied Materials & Interfaces
B Heli, E Morales-Narváez, H Golmohammadi, A Ajji, A Merkoçi
The localized surface plasmon resonance exhibited by noble metal nanoparticles can be sensitively tuned by varying their size and interparticle distances. We report that corrosive vapour (ammonia) exposure dramatically reduces the population density of silver nanoparticles (AgNPs) embedded within bacterial cellulose, leading to a larger distance between the remaining nanoparticles and a decrease in the UV-Vis absorbance associated with the AgNP plasmonic properties. We also found that the size distribution of AgNPs embedded in bacterial cellulose undergoes a reduction in the presence of volatile compounds released during food spoilage, modulating the studied nanoplasmonic properties...
April 21, 2016: Nanoscale
Weiqiang Yu, Chao Qian, Weimin Weng, Songmei Zhang
STATEMENT OF PROBLEM: Lipopolysaccharides (LPS) are constituents of gingival crevicular fluid and may affect the base metal alloys used in metal ceramic crowns. The role of LPS in base metal alloys is currently unknown. PURPOSE: The purpose of this in vitro study was to evaluate the effects of gram-negative bacterial LPS on the electrochemical behavior of Ni-Cr and Co-Cr alloys. MATERIAL AND METHODS: Alloy specimens were divided into 4 groups according to Escherichia coli LPS concentration (0, 0...
August 2016: Journal of Prosthetic Dentistry
Isabella Marchesi, Greta Ferranti, Antonella Mansi, Anna M Marcelloni, Anna R Proietto, Navneet Saini, Paola Borella, Annalisa Bargellini
Physical and chemical disinfection methods have been proposed with the aim of controlling Legionella water contamination. To date, the most effective procedures for reducing bacterial contamination have not yet been defined. The aim of this study was to assess the long-term effectiveness of various disinfection procedures in order to reduce both culturable and nonculturable (NC) legionellae in different hospital water networks treated with heat, chlorine dioxide, monochloramine, and hydrogen peroxide. The temperature levels and biocide concentrations that proved to give reliable results were analyzed...
May 15, 2016: Applied and Environmental Microbiology
K N Pandiyaraj, A Arun Kumar, M C Ramkumar, A Sachdev, P Gopinath, Pieter Cools, N De Geyter, R Morent, R R Deshmukh, P Hegde, C Han, M N Nadagouda
The superior bulk properties (corrosion resistance, high strength to weight ratio, relatively low cost and easy processing) of hydrocarbon based polymers such as polypropylene (PP) have contributed significantly to the development of new biomedical applications such as artificial organs and cell scaffolds. However, low cell affinity is one of the main draw backs for PP due to its poor surface properties. In tissue engineering, physico-chemical surface properties such as hydrophilicity, polar functional groups, surface charge and morphology play a crucial role to enrich the cell proliferation and adhesion...
May 2016: Materials Science & Engineering. C, Materials for Biological Applications
Mian Chen, Erlin Zhang, Lan Zhang
In this research, Ag element was selected as an antibacterial agent to develop an antibacterial Ti-Ag alloy by a powder metallurgy. The microstructure, phase constitution, mechanical properties, corrosion resistance and antibacterial properties of the Ti-Ag sintered alloys have been systematically studied by X-ray diffraction (XRD), scanning electron microscope (SEM), compressive test, electrochemical measurements and antibacterial test. The effects of the Ag powder size and the Ag content on the antibacterial property and mechanical property as well as the anticorrosion property have been investigated...
May 2016: Materials Science & Engineering. C, Materials for Biological Applications
Changli Zhao, Peng Hou, Jiahua Ni, Pei Han, Yimin Chai, Xiaonong Zhang
Fluoridated hydroxyapatite (FHA) coating can help retard the degradation of magnesium, and possess good biocompatibility. However, the antibacterial property of FHA is very limited. In this work, we aimed to incorporate silver into FHA structure to fabricate biocompatible and antibacterial coatings with enhanced anticorrosion property. The results showed that the Ag-FHA coating prepared by electrochemical deposition and subsequent immersion in AgNO3 solution was superior to the Ag-FHA coating prepared by coelectrodeposition in terms of crystal structure, surface morphology and corrosion resistance...
March 2, 2016: ACS Applied Materials & Interfaces
Sathyanarayanan Sridhar, Zain Abidi, Thomas G Wilson, Pilar Valderrama, Chandur Wadhwani, Kelli Palmer, Danieli C Rodrigues
Presence of metal ions and debris resulting from corrosion processes of dental implants in vivo can elicit adverse tissue reactions, possibly leading to peri-implant bone loss and eventually implant failure. This study hypothesized that the synergistic effects of bacterial biofilm and micromotion can cause corrosion of dental implants and release of metal ions in vivo. The goal is to simulate the oral environment where an implant will be exposed to a combination of acidic electrochemical environment and mechanical forces...
June 2016: Journal of Oral Implantology
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