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Graphene biofilm

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https://www.readbyqxmd.com/read/28764786/evaluation-of-the-antibacterial-power-and-biocompatibility-of-zinc-oxide-nanorods-decorated-graphene-nanoplatelets-new-perspectives-for-antibiodeteriorative-approaches
#1
Elena Zanni, Erika Bruni, Chandrakanth Reddy Chandraiahgari, Giovanni De Bellis, Maria Grazia Santangelo, Maurizio Leone, Agnese Bregnocchi, Patrizia Mancini, Maria Sabrina Sarto, Daniela Uccelletti
BACKGROUND: Nanotechnologies are currently revolutionizing the world around us, improving the quality of our lives thanks to a multitude of applications in several areas including the environmental preservation, with the biodeterioration phenomenon representing one of the major concerns. RESULTS: In this study, an innovative nanomaterial consisting of graphene nanoplatelets decorated by zinc oxide nanorods (ZNGs) was tested for the ability to inhibit two different pathogens belonging to bacterial genera frequently associated with nosocomial infections as well as biodeterioration phenomenon: the Gram-positive Staphylococcus aureus and the Gram-negative Pseudomonas aeruginosa...
August 1, 2017: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/28704738/high-efficiency-microbial-electrosynthesis-of-acetate-from-carbon-dioxide-by-a-self-assembled-electroactive-biofilm
#2
Tian-Shun Song, Hongkun Zhang, Haixia Liu, Dalu Zhang, Haoqi Wang, Yang Yang, Hao Yuan, Jingjing Xie
Microbial electrosynthesis (MES) is a biocathode-driven process, producing high-value chemicals from CO2. Here, an in situ self-assembled graphene oxide (rGO)/biofilm was constructed, in MES, for high efficient acetate production. GO has been successfully reduced by electroautotrophic bacteria for the first time. An increase, of 1.5 times, in the volumetric acetate production rate, was obtained by self-assembling rGO/biofilm, as compared to the control group. In MES with rGO/biofilm, a volumetric acetate production rate of 0...
July 3, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28677651/effect-of-precursor-on-antifouling-efficacy-of-vertically-oriented-graphene-nanosheets
#3
Karthika Prasad, Chaturanga D Bandara, Shailesh Kumar, Gurinder Pal Singh, Bastian Brockhoff, Kateryna Bazaka, Kostya Ken Ostrikov
Antifouling efficacy of graphene nanowalls, i.e., substrate-bound vertically-oriented graphene nanosheets, has been demonstrated against biofilm-forming Gram-positive and Gram-negative bacteria. Where graphene nanowalls are typically prepared using costly high-temperature synthesis from high-purity carbon precursors, large-scale applications demand efficient, low-cost processes. The advancement of plasma enabled synthesis techniques in the production of nanomaterials has opened a novel and effective method for converting low-cost natural waste resources to produce nanomaterials with a wide range of applications...
July 4, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28628977/enhanced-performance-of-microbial-fuel-cell-with-in-situ-preparing-dual-graphene-modified-bioelectrode
#4
Junfeng Chen, Yongyou Hu, Xiaojun Tan, Lihua Zhang, Wantang Huang, Jian Sun
This study proposed a three-step method to prepare dual graphene modified bioelectrode (D-GM-BE) by in situ microbial-induced reduction of GO and polarity reversion in microbial fuel cell (MFC). Both graphene modified bioanode (GM-BA) and biocathode (GM-BC) were of 3D graphene/biofilm architectures; the viability and thickness of microbial biofilm decreased compared with control bioelectrode (C-BE). The coulombic efficiency (CE) of GM-BA was 2.1 times of the control bioanode (C-BA), which demonstrated higher rate of substrates oxidation; the relationship between peak current and scan rates data meant that GM-BC was of higher efficiency of catalyzing oxygen reduction than the control biocathode (C-BC)...
October 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28623661/graphene-nanolayers-as-a-new-method-for-bacterial-biofilm-prevention-preliminary-results
#5
Łucja Dybowska-Sarapuk, Andrzej Kotela, Jakub Krzemiński, Marta Wróblewska, Halina Marchel, Magdalena Romaniec, Paweł Łęgosz, Małgorzata Jakubowska
Biofilms are microbial communities of surface-attached cells embedded in a self-produced extracellular matrix. They have been found to play a role in a wide variety of infections, including catheter-related urinary tract and bloodstream infections, and, therefore remain a significant source of morbidity and mortality among the world's population. Recently, much attention has been devoted to the prevention of biofilm formation on implant surfaces. Nanomaterials such as graphene, characterized by antibacterial activity and low toxicity to human cells, are promising candidates for biomedical applications...
June 16, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28520397/laser-induced-graphene-layers-and-electrodes-prevents-microbial-fouling-and-exerts-antimicrobial-action
#6
Swatantra P Singh, Yilun Li, Avraham Be'er, Yoram Oren, James M Tour, Christopher J Arnusch
Prevention of fouling on surfaces is a major challenge that broadly impacts society. Water treatment technologies, hospital infrastructure, and seawater pipes exemplify surfaces that are susceptible to biofouling. Here we show that laser-induced graphene (LIG) printed on a polyimide film by irradiation with a CO2 infrared laser under ambient conditions is extremely biofilm resistant while as an electrode is strongly antibacterial. We investigated the antibacterial activity of the LIG surface using LIG powder in suspension or deposited on surfaces, and its activity depended on the particle size and oxygen content...
May 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28484115/microbially-reduced-graphene-oxide-shows-efficient-electricity-ecovery-from-artificial-dialysis-wastewater
#7
Yuko Goto, Naoko Yoshida
Anodes are crucial in determining the electricity recovery of microbial fuel cells (MFCs). In this study, graphene oxide (GO) was used as an anodic material for electricity recovery from artificial dialysis wastewater (ADWW). Anaerobic incubation of ADWW with GO for 21 days produced a hydrogel complex containing embedded microbial cells and microbially reduced GO (rGO). The rGO complex recovered 540 to 810 μA/cm(3) of catalytic current from ADWW after 10 days of electrochemical cultivation at 200 mV (vs. Ag/AgCl), which was approximately thirty times higher than that recovered from graphite felt (GF), a representative anode in MFCs...
May 2, 2017: Journal of General and Applied Microbiology
https://www.readbyqxmd.com/read/28454001/bacterial-community-shift-and-improved-performance-induced-by-in-situ-preparing-dual-graphene-modified-bioelectrode-in-microbial-fuel-cell
#8
Junfeng Chen, Yongyou Hu, Lihua Zhang, Wantang Huang, Jian Sun
Dual graphene modified bioelectrode (D-GM-BE) was prepared by in situ microbial-induced reduction of graphene oxide (GO) and polarity reversion in microbial fuel cell (MFC). Next Generation Sequencing technology was used to elucidate bacterial community shift in response to improved performance in D-GM-BE MFC. The results indicated an increase in the relative ratio of Proteobacteria, but a decrease of Firmicutes was observed in graphene modified bioanode (GM-BA); increase of Proteobacteria and Firmicutes were observed in graphene modified biocathode (GM-BC)...
August 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28335307/zinc-oxide-nanorods-decorated-graphene-nanoplatelets-a-promising-antimicrobial-agent-against-the-cariogenic-bacterium-streptococcus-mutans
#9
Elena Zanni, Chandrakanth Reddy Chandraiahgari, Giovanni De Bellis, Maria Rita Montereali, Giovanna Armiento, Paolo Ballirano, Antonella Polimeni, Maria Sabrina Sarto, Daniela Uccelletti
Nanomaterials are revolutionizing the field of medicine to improve the quality of life due to the myriad of applications stemming from their unique properties, including the antimicrobial activity against pathogens. In this study, the antimicrobial and antibiofilm properties of a novel nanomaterial composed by zinc oxide nanorods-decorated graphene nanoplatelets (ZNGs) are investigated. ZNGs were produced by hydrothermal method and characterized through field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) techniques...
September 29, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28138525/adhesion-mechanisms-of-curli-subunit-csga-to-abiotic-surfaces
#10
Elizabeth P DeBenedictis, Jenny Liu, Sinan Keten
Curli fibers are functional amyloids that play a key role in biofilm structure and adhesion to various surfaces. Strong bioinspired adhesives comprising curli fibers have recently been created; however, the mechanisms curli uses to attach onto abiotic surfaces are still uncharacterized. Toward a materials-by-design approach for curli-based adhesives and multifunctional materials, we examine curli subunit adsorption onto graphene and silica surfaces through atomistic simulation. We find that both structural features and sequence influence adhesive strength, enabling the CsgA subunit to adhere strongly to both polar and nonpolar surfaces...
November 2016: Science Advances
https://www.readbyqxmd.com/read/28027944/antibiofilm-efficacy-of-green-synthesized-graphene-oxide-silver-nanocomposite-using-lagerstroemia-speciosa-floral-extract-a-comparative-study-on-inhibition-of-gram-positive-and-gram-negative-biofilms
#11
Shatavari Kulshrestha, Shariq Qayyum, Asad U Khan
Biofilm architecture provides bacteria with enhanced antibiotic resistance, thus raising the need to search for alternative therapies that can inhibit the bacterial colonization. In the present study, we synthesized graphene oxide-silver nanocomposite (GO-Ag) by non-toxic and eco-friendly route using a floral extract of Legistromia speciosa (L.) Pers. The gas chromatography-mass spectrometry (GC-MS) analysis of plant extract revealed the presence of compounds which can simultaneously act as reducing and capping agents...
February 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28003049/toxicity-and-transformation-of-graphene-oxide-and-reduced-graphene-oxide-in-bacteria-biofilm
#12
Zhiling Guo, Changjian Xie, Peng Zhang, Junzhe Zhang, Guohua Wang, Xiao He, Yuhui Ma, Bin Zhao, Zhiyong Zhang
Impact of graphene based material (GNMs) on bacteria biofilm has not been well understood yet. In this study, we compared the impact of graphene oxide (GO) and reduced graphene oxide (rGO) on biofilm formation and development in Luria-Bertani (LB) medium using Escherichia coli and Staphylococcus aureus as models. GO significantly enhanced the cell growth, biofilm formation, and biofilm development even up to a concentration of 500mg/L. In contrast, rGO (≥50mg/L) strongly inhibited cell growth and biofilm formation...
February 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/27979202/the-graphene-oxide-and-chitosan-biopolymer-loads-tio2-for-antibacterial-and-preservative-research
#13
Weirui Xu, Wenjie Xie, Xiaoquan Huang, Xu Chen, Na Huang, Xin Wang, Jie Liu
Microorganism breeding is a known cause of food spoilage and disease transmission. Aspergillus niger (A. niger) and Bacillus subtilis (B. subtilis) are examples of microorganisms that cause deterioration of fresh fruits and vegetables during storage, which can be a serious threat to human health. In this work, we synthesized a self-assembled film of graphene oxide (GO) and chitosan (CS) biopolymers with titanium dioxide (TiO2) nanoparticles embedded in its surface. We then characterized its antibacterial and preservative properties...
April 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27855326/inhibited-transport-of-graphene-oxide-nanoparticles-in-granular-quartz-sand-coated-with-bacillus-subtilis-and-pseudomonas-putida-biofilms
#14
Jian-Zhou He, Deng-Jun Wang, Huan Fang, Qing-Long Fu, Dong-Mei Zhou
Increasing production and use of graphene oxide nanoparticles (GONPs) boost their wide dissemination in the subsurface environments where biofilms occur ubiquitously, representative of the physical and chemical heterogeneities. This study aimed at investigating the influence of Gram-positive Bacillus subtilis (BS) and Gram-negative Pseudomonas putida (PP) biofilms on the transport of GONPs under different ionic strengths (0.1, 0.5, and 1.0 mM CaCl2) at neutral pH 7.2 in water-saturated porous media. Particularly, the X-ray micro-computed tomography was used to quantitatively characterize the pore structures of sand columns in the presence and absence of biofilms...
February 2017: Chemosphere
https://www.readbyqxmd.com/read/27710143/the-future-development-of-bacteria-fighting-medical-devices-the-role-of-graphene-oxide
#15
REVIEW
Valentina Palmieri, Massimiliano Papi, Claudio Conti, Gabriele Ciasca, Giuseppe Maulucci, Marco De Spirito
The clinical challenge that research on antibacterial coatings faces nowadays is the need of reduction of resistant bacterial infections, major source of implant rejection and repeated surgery. In order to avoid microorganisms attachment and biofilm formation, coating materials on medical devices have been developed with shortcomings represented by short-term durability and induction of new mechanisms of bacterial resistance. Graphene-based films and hydrogel could represent the next generation protective coatings due to their excellent mechanical, chemical and thermal properties, high nanoparticle adsorption and antibacterial action...
November 2016: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/27690183/bacterial-hyaluronidase-self-triggered-prodrug-release-for-chemo-photothermal-synergistic-treatment-of-bacterial-infection
#16
Haiwei Ji, Kai Dong, Zhengqin Yan, Chao Ding, Zhaowei Chen, Jinsong Ren, Xiaogang Qu
A novel platform for targeted on-demand prodrug ascorbic acid (AA) delivery is fabricated using a bacterial hyaluronidase sensitive graphene-mesoporous silica nanosheet@hyaluronic acid-magnetic nanoparticles as the nanocarrier to treat bacterial infections. The released AA can be converted to detrimental •OH in situ on the surface of bacteria. With the chemo-photothermal synergistic effect, the designed antibacterial system can effectively inactivate bacteria and disperse stubborn biofilm.
December 2016: Small
https://www.readbyqxmd.com/read/27639489/green-synthesis-of-graphene-silver-nanocomposites-and-its-application-as-a-potent-marine-antifouling-agent
#17
Maxine Swee-Li Yee, Poi-Sim Khiew, Wee Siong Chiu, Yuen Fen Tan, Yih-Yih Kok, Chee-Onn Leong
Fouling of marine surfaces has been a perpetual problem ever since the days of the early sailors. The tenacious attachment of seaweed and invertebrates to man-made surfaces, notably on ship hulls, has incurred undesirable economic losses. Graphene receives great attention in the materials world for its unique combination of physical and chemical properties. Herein, we present a novel 2-step synthesis method of graphene-silver nanocomposites which bypasses the formation of graphene oxide (GO), and produces silver nanoparticles supported on graphene sheets through a mild hydrothermal reduction process...
December 1, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27597747/anti-bacterial-properties-of-ultrafiltration-membrane-modified-by-graphene-oxide-with-nano-silver-particles
#18
Jingchun Li, Xuyang Liu, Jiaqi Lu, Yudan Wang, Guanglu Li, Fangbo Zhao
To improve the anti-biofouling properties of PVDF membranes, GO-Ag composites were synthesized and used as membrane antibacterial agent by a simple and environmentally friendly method. As identified by XRD, TEM and FTIR analysis, AgNPs were uniformly assembled on the synthesized GO-Ag sheets. The membranes were prepared by phase inversion method with different additional amounts (0.00-0.15wt%) of GO-Ag composites. The GO-Ag composites modified membranes show improved hydrophilicity, mechanical property and permeability than unmodified PVDF membrane...
December 15, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27438339/chitosan-iron-oxide-coated-graphene-oxide-nanocomposite-hydrogel-a-robust-and-soft-antimicrobial-biofilm
#19
Achyut Konwar, Sanjeeb Kalita, Jibon Kotoky, Devasish Chowdhury
We report a robust biofilm with antimicrobial properties fabricated from chitosan-iron oxide coated graphene oxide nanocomposite hydrogel. For the first time, the coprecipitation method was used for the successful synthesis of iron oxide coated graphene oxide (GIO) nanomaterial. After this, films were fabricated by the gel-casting technique aided by the self-healing ability of the chitosan hydrogel network system. Both the nanomaterial and the nanocomposite films were characterized by techniques such as scanning electron microscopy, FT-IR spectroscopy, X-ray diffraction, and vibrating sample magnetometry...
August 17, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27327408/from-solution-to-biointerface-graphene-self-assemblies-of-varying-lateral-sizes-and-surface-properties-for-biofilm-control-and-osteodifferentiation
#20
Zhaojun Jia, Yuying Shi, Pan Xiong, Wenhao Zhou, Yan Cheng, Yufeng Zheng, Tingfei Xi, Shicheng Wei
Bringing multifunctional graphene out of solution through facile self-assembly to form 2D surface nanostructures, with control over the lateral size and surface properties, would be an intriguing accomplishment, especially in biomedical fields where biointerfaces with functional diversity are in high demand. Guided by this goal, in this work, we built such graphene-based self-assemblies on orthopedic titanium, attempting to selectively regulate bacterial activities and osteoblastic functions, which are both crucial in bone regeneration...
July 13, 2016: ACS Applied Materials & Interfaces
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