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https://www.readbyqxmd.com/read/29240395/narrow-band-gap-conjugated-polyelectrolytes
#1
Qiuhong Cui, Guillermo C Bazan
Two essential structural elements define a class of materials called conjugated polyelectrolytes (CPEs). The first is a polymer framework with an electronically delocalized, π-conjugated structure. This component allows one to adjust desirable optical and electronic properties, for example the range of wavelengths absorbed, emission quantum yields, electron affinity, and ionization potential. The second defining feature is the presence of ionic functionalities, which are usually linked via tethers that can modulate the distance of the charged groups relative to the backbone...
December 14, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29235842/mussel-inspired-synthesis-of-nir-responsive-and-biocompatible-ag-graphene-2d-nano-agents-for-versatile-bacterial-disinfections
#2
Xin Fan, Fan Yang, Chuanxiong Nie, Ye Yang, Haifeng Ji, Chao He, Chong Cheng, Changsheng Zhao
Pathogenic bacterial infection has been becoming as a global threat towards people's health, especially the massive usage of antibiotics due to the lack of antibacterial agents with less side-effects. Developing new nano-agents to fight pathogenic bacteria has provided enormous new possibilities in the treatment of bacterial infections, such as the graphene based 2D antibacterial nano-agents with different bacterial inhibition capabilities; however, mussel-inspired design of NIR-responsive and biocompatible Ag-graphene nano-agents possessed with efficient and versatile bacterial disinfection activities have rarely been reported...
December 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29220744/sensitive-detection-of-pyoverdine-with-an-electrochemical-sensor-based-on-electrochemically-generated-graphene-functionalized-with-gold-nanoparticles
#3
Islem Gandouzi, Mihaela Tertis, Andreea Cernat, Amina Bakhrouf, Maria Coros, Stela Pruneanu, Cecilia Cristea
The design and development of an electrochemical sensor for the sensitive and selective determination of pyoverdine, a virulence factor secreted by Pseudomonas aeruginosa, bacteria involved in nosocomial infections is presented in this work. The presence of pyoverdine in water and body fluids samples can be directly linked to the presence of the Pseudomonas bacteria, thus being a nontoxic and low cost marker for the detection of water pollution as well as for the biological contamination of other media. The sensor was elaborated using layer-by-layer technique for the deposition of a graphene‑gold nanoparticles composite film on the graphite-based screen printed electrode, from aqueous suspension...
December 5, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/29218826/poly-lactic-acid-composites-based-on-graphene-oxide-particles-with-antibacterial-behavior-enhanced-by-electrical-stimulus-and-biocompatibility
#4
P Arriagada, H Palza, P Palma, M Flores, P Caviedes
Poly(lactic acid) (PLA) is a biodegradable and biocompatible polyester widely used in biomedical applications. Unfortunately, this biomaterial suffers from some shortcomings related with the absence of both bioactivity and antibacterial capacity. In this work, composites of PLA with either graphene oxide (GO) or thermally reduced graphene oxide (TrGO) were prepared by melt mixing to overcome these limitations. PLA composites with both GO and TrGO inhibited the attachment and proliferation of E. coli and S. aureus bacteria depending on the kind and amount of filler...
December 8, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29216517/go-agcl-ag-nanocomposites-with-enhanced-visible-light-driven-catalytic-properties-for-antibacterial-and-biofilm-disrupting-applications
#5
Xinhuan Wang, Qiusen Han, Ning Yu, Tian Wang, Chen Wang, Rong Yang
Nanomaterials with visible light-driven photocatalytic activity have attracted much attention due to their excellent abilities in degradation of various organic pollutants as well as inactivating bacteria. Herein, graphene oxide (GO) enwrapped silver chloride/silver (AgCl/Ag) nanocomposites with high visible light absorption were designed and fabricated as efficient antibacterial agents. AgCl NPs were synthesized in the presence of GO first and Ag NPs were coated on AgCl surface by heat reduction to form GO-AgCl/Ag nanocomposites...
November 26, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29184938/minocycline-hydrochloride-loaded-on-titanium-by-graphene-oxide-an-excellent-antibacterial-platform-with-the-synergistic-effect-of-contact-killing-and-release-killing
#6
Wenhao Qian, Jiajun Qiu, Jiansheng Su, Xuanyong Liu
Titanium and its alloys have been widely used in orthopedic and dental implants because of their excellent properties. However, implant failures still occur due to implant-associated bacterial infections. Therefore, proper surface modification of titanium and its alloys is necessary. In this work, commercial pure titanium plates were modified with graphene oxide (GO) which was used to load minocycline hydrochloride. Gram-positive Staphylococcus aureus (S. aureus) and Streptococcus mutans (S. mutans) and Gram-negative Escherichia coli (E...
November 29, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/29174973/a-novel-screen-printed-mast-cell-based-electrochemical-sensor-for-detecting-spoilage-bacterial-quorum-signaling-molecules-n-acyl-homoserine-lactones-in-freshwater-fish
#7
Donglei Jiang, Yan Liu, Hui Jiang, Shengqi Rao, Wu Fang, Mangang Wu, Limin Yuan, Weiming Fang
A novel screen-printed cell-based electrochemical sensor was developed to assess bacterial quorum signaling molecules, N-acylhomoserine lactones (AHLs). Screen-printed carbon electrode (SPCE), which possesses excellent properties such as low-cost, disposable and energy-efficient, was modified with multi-walled carbon nanotubes (MWNTs) to improve electrochemical signals and enhance the sensitivity. Rat basophilic leukemia (RBL-2H3) mast cells encapsulated in alginate/graphene oxide (NaAgl/GO) hydrogel were immobilized on the MWNTs/SPCE to serve as recognition element...
November 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29143262/influences-of-graphene-oxide-on-biofilm-formation-of-gram-negative-and-gram-positive-bacteria
#8
Chao Song, Chun-Miao Yang, Xue-Fei Sun, Peng-Fei Xia, Jing Qin, Bei-Bei Guo, Shu-Guang Wang
In this study, we evaluated the influences of graphene oxide (GO) on biofilm formation. Escherichia coli MG1655 and Bacillus subtilis 168 were used as models for Gram-negative and Gram-positive bacteria. The growth profiles and viability assays indicated that GO exhibited a high antibacterial activity, of which the negative effects on bacteria growth raised with the increasing GO concentration. The antibacterial activity of GO was mainly attributed to the membrane stress and ROS-independent oxidative stress...
November 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29078354/enhanced-antibacterial-activity-through-the-controlled-alignment-of-graphene-oxide-nanosheets
#9
Xinglin Lu, Xunda Feng, Jay R Werber, Chiheng Chu, Ines Zucker, Jae-Hong Kim, Chinedum O Osuji, Menachem Elimelech
The cytotoxicity of 2D graphene-based nanomaterials (GBNs) is highly important for engineered applications and environmental health. However, the isotropic orientation of GBNs, most notably graphene oxide (GO), in previous experimental studies obscured the interpretation of cytotoxic contributions of nanosheet edges. Here, we investigate the orientation-dependent interaction of GBNs with bacteria using GO composite films. To produce the films, GO nanosheets are aligned in a magnetic field, immobilized by cross-linking of the surrounding matrix, and exposed on the surface through oxidative etching...
October 26, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29062127/graphene-oxide-electrodeposited-electrode-enhances-start-up-and-selective-enrichment-of-exoelectrogens-in-bioelectrochemical-systems
#10
R M Alonso, M I San-Martín, A Sotres, A Escapa
This study seeks to assess the impact that the anodic electrodeposition of graphene oxide (GO) has on the start-up process and on the development of microbial communities on the anode of BESs. The GO electrodeposited electrodes were characterised in abiotic conditions to verify the extent of the modification and were then transferred to a bioelectrochemical reactor. Results showed that the modified electrode allowed for a reduced start-up time compared to the control electrode. After three months, high throughput sequencing was performed, revealing that electrochemically reduced graphene oxide acts as a selective agent toward exoelectrogenic bacteria as Geobacter...
October 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29051936/nio-nanoflakes-grafted-graphene-an-excellent-photocatalyst-and-a-novel-nanomaterial-for-achieving-complete-pathogen-control
#11
A Arshad, J Iqbal, Q Mansoor
The increased levels of industrial pollutants in water and of drug-resistant pathogens more generally are a serious threat to human and aquatic life. Herein, we present the solar-light-induced dye removal and bactericidal properties of nickel oxide (NiO) and graphene nanoplatelet (GNP) nanocomposites. The conducting nature of GNPs is the key factor that accounts for the enhanced photocatalytic and antibacterial activity. Remarkably, the graphene/NiO nanocomposite shows outstanding photocatalytic activity (99% degradation) as compared to NiO (34%) alone, which makes it a potential candidate for the depollution of dye-contaminated water...
November 2, 2017: Nanoscale
https://www.readbyqxmd.com/read/29040914/efficient-capture-rapid-killing-and-ultrasensitive-detection-of-bacteria-by-a-nano-decorated-multi-functional-electrode-sensor
#12
Runrun Wu, Yue Ma, Jianming Pan, Shih-Hui Lee, Jinxin Liu, Hengjia Zhu, Runxin Gu, Kenneth J Shea, Guoqing Pan
In this work, we demonstrated a nano-decorated porous impedance electrode sensor for efficient capture, rapid killing and ultrasensitive detection of bacteria. The multi-functional sensor was prepared by a facile sonochemical method via in situ deposition of antibacterial prickly Zn-CuO nanoparticles and graphene oxide (GO) nanosheets on a Ni porous electrode. Due to the surface burr-like nanostructures, the nano-decorated impedance sensor exhibited very good bacterial-capture efficiency (70 - 80% in 20min) even at a low concentration of 50 CFU mL(-1), rapid antibacterial rate (100% killing in 30min) and high detection sensitivity (as low as 10 CFU mL(-1))...
October 7, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29030671/graphene-based-label-free-electrochemical-aptasensor-for-rapid-and-sensitive-detection-of-foodborne-pathogen
#13
Shalini Muniandy, Ignatius Julian Dinshaw, Swe Jyan Teh, Chin Wei Lai, Fatimah Ibrahim, Kwai Lin Thong, Bey Fen Leo
Reduced graphene oxide (rGO) has emerged as a promising nanomaterial for reliable detection of pathogenic bacteria due to its exceptional properties such as ultrahigh electron transfer ability, large surface to volume ratio, biocompatibility, and its unique interactions with DNA bases of the aptamer. In this study, rGO-azophloxine (AP) nanocomposite aptasensor was developed for a sensitive, rapid, and robust detection of foodborne pathogens. Besides providing an excellent conductive and soluble rGO nanocomposite, the AP dye also acts as an electroactive indicator for redox reactions...
October 13, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28987409/enhance-wastewater-biological-treatment-through-the-bacteria-induced-graphene-oxide-hydrogel
#14
Liang Shen, Ziheng Jin, Dian Wang, Yuanpeng Wang, Yinghua Lu
The interaction between bacteria and graphene-family materials like pristine graphene, graphene oxide (GO) and reduced graphene oxide (rGO) is such an elusive issue that its implication in environmental biotechnology is unclear. Herein, two kinds of self-assembled bio-rGO-hydrogels (BGHs) were prepared by cultivating specific Shewanella sp. strains with GO solution for the first time. The microscopic examination by SEM, TEM and CLSM indicated a porous 3D structure of BGHs, in which live bacteria firmly anchored and extracellular polymeric substances (EPS) abundantly distributed...
September 24, 2017: Chemosphere
https://www.readbyqxmd.com/read/28968591/implication-of-graphene-oxide-in-cd-contaminated-soil-a-case-study-of-bacterial-communities
#15
Ting Xiong, Xingzhong Yuan, Hou Wang, Lijian Leng, Hui Li, Zhibin Wu, Longbo Jiang, Rui Xu, Guangming Zeng
The application of graphene oxide (GO) has attracted increasing concerns in the past decade regarding its environmental impacts, except for the impact of GO on a metal-contaminated soil system, due to its special properties. In the present work, the effects of GO on the migration and transformation of heavy metals and soil bacterial communities in Cd-contaminant soil were systematically evaluated. Soil samples were exposed to different doses of GO (0, 1, and 2 g kg(-1)) over 60 days. The Community Bureau of Reference (BCR) sequential extraction procedure was used to reflect the interaction between GO and Cd...
January 1, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/28961500/chronic-toxicity-of-graphene-and-graphene-oxide-in-sequencing-batch-bioreactors-a-comparative-investigation
#16
Hang N Nguyen, Debora F Rodrigues
The present study investigates the chronic toxicity of graphene (G) and graphene oxide (GO) in activated sludge. Sequencing batch bioreactors were fed with influents containing 0, 1 and 5mgL(-1) of GO or G (12h cycles) for ten days. Reduction in performance of the bioreactors in relation to chemical oxygen demand, ammonia and phosphate removals was observed after three days in the bioreactors fed with 5mgL(-1) of nanomaterials. After about eight days, these reactors reached a steady state nutrient removal, which corresponded to recovery of certain groups of ammonia oxidizing bacteria and phosphate accumulating bacteria despite the increasing accumulation of nanomaterials in the sludge...
September 20, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28949519/pyrosequencing-reveals-soil-enzyme-activities-and-bacterial-communities-impacted-by-graphene-and-its-oxides
#17
Yan Rong, Yi Wang, Yina Guan, Jiangtao Ma, Zhiqiang Cai, Guanghua Yang, Xiyue Zhao
Graphene (GN) and graphene oxides (GOs) are novel carbon nanomaterial; they have been attracting much attention because of their excellent properties and are widely applied in many areas, including energy, electronics, biomedicine, environmental science, etc. With industrial production and consumption of GN/GO, they will inevitably enter the soil and water environments. GN/GO may directly cause certain harm to microorganisms and lead to ecological and environmental risks. GOs are GN derivatives with abundant oxygen-containing functional groups in their graphitic backbone...
October 10, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28910678/colorimetric-aptasensor-for-the-detection-of-salmonella-enterica-serovar-typhimurium-using-znfe2o4-reduced-graphene-oxide-nanostructures-as-an-effective-peroxidase-mimetics
#18
Shijia Wu, Nuo Duan, Yueting Qiu, Jinghong Li, Zhouping Wang
A new colorimetric aptasensor platform was fabricated to detect Salmonella enterica serovar typhimurium based on the peroxidase-like activity of ZnFe2O4-reduced graphene oxide (ZnFe2O4/rGO) nanostructures. The synthesized ZnFe2O4/rGO can catalytically oxidize 3,3',5,5'-tetramethylbenzidine (TMB) by H2O2 and generate a typical blue product, which was detected by micro-reader at 652nm. Therefore, ZnFe2O4/rGO was conjugated with aptamer to act as the signal probe. Biotin modified aptamer was immobilized onto the micro-plate to act as the capture probe...
September 6, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28821050/clean-approach-to-synthesis-of-graphene-like-cufe2o4-polysaccharide-resin-nanohybrid-bifunctional-compound-for-dye-adsorption-and-bacterial-capturing
#19
Mostafa Hossein Beyki, Sarina Ehteshamzadeh Ganjbakhsh, Sara Minaeian, Farzaneh Shemirani
Focus of this research is on employment of a green route to prepare magnetic CuFe2O4@polysaccharide resin for environmental remediation purpose. The method is including solvent free solid state synthesis of copper ferrite nanoparticles by combustion route using cellulose as fuel. Then polysaccharide resin as well as its magnetic composite was prepared by using glucose, citric acid and copper ferrite as solid raw materials. Characterization study using FESEM and TEM images showed that as synthesized resin possesses graphene like structure as ferrite nanoparticles are dispersed in the matrice of resin...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28772965/rapid-and-sensitive-detection-of-bacteria-response-to-antibiotics-using-nanoporous-membrane-and-graphene-quantum-dot-gqds-based-electrochemical-biosensors
#20
Weiwei Ye, Jiubiao Guo, Xianfeng Bao, Tian Chen, Wenchuan Weng, Sheng Chen, Mo Yang
The wide abuse of antibiotics has accelerated bacterial multiresistance, which means there is a need to develop tools for rapid detection and characterization of bacterial response to antibiotics in the management of infections. In the study, an electrochemical biosensor based on nanoporous alumina membrane and graphene quantum dots (GQDs) was developed for bacterial response to antibiotics detection. Anti-Salmonella antibody was conjugated with amino-modified GQDs by glutaraldehyde and immobilized on silanized nanoporous alumina membranes for Salmonella bacteria capture...
May 31, 2017: Materials
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