Topics

PubMed Journals Articles About "Role Surface Charge Enhancing Antibacterial Activity Fluorescent Carbon" RSS

21:19 EST 10th December 2019 | BioPortfolio

Role Surface Charge Enhancing Antibacterial Activity Fluorescent Carbon PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Role Surface Charge Enhancing Antibacterial Activity Fluorescent Carbon articles that have been published worldwide.

More Information about "Role Surface Charge Enhancing Antibacterial Activity Fluorescent Carbon" on BioPortfolio

We have published hundreds of Role Surface Charge Enhancing Antibacterial Activity Fluorescent Carbon news stories on BioPortfolio along with dozens of Role Surface Charge Enhancing Antibacterial Activity Fluorescent Carbon Clinical Trials and PubMed Articles about Role Surface Charge Enhancing Antibacterial Activity Fluorescent Carbon for you to read. In addition to the medical data, news and clinical trials, BioPortfolio also has a large collection of Role Surface Charge Enhancing Antibacterial Activity Fluorescent Carbon Companies in our database. You can also find out about relevant Role Surface Charge Enhancing Antibacterial Activity Fluorescent Carbon Drugs and Medications on this site too.

Showing "Role surface charge enhancing antibacterial activity fluorescent carbon" PubMed Articles 1–25 of 47,000+

Role of surface charge in enhancing antibacterial activity of fluorescent carbon dots.

Herein, different surface charged Carbon dots (Cdots) were synthesized by using diethylene glycol as a carbon source with various amine containing surface passivating agents. The synthesis method is very simple and fast microwave oven based, that results in almost similar sized positive, negative and uncharged fluorescent Cdots which has been confirmed by zeta potential analysis in our case. The formation of Cdots was confirmed by characterization using fluorescence spectroscopy, transmission electron micro...


2D Graphdiyne Oxide Serves as a Superior New Generation of Antibacterial Agents.

Graphdiyne (GDY) as an emerging 2D carbon-network nanomaterial possesses many fascinating properties that lead to numerous exciting applications, but the use of GDY and its derivatives in the antibacterial field has not yet been discovered. In this study, we first report on the use and evaluation of GDY and graphdiyne oxide (GDYO) as antibacterial agents and propose the antibacterial mechanisms of GDY-based nanomaterials. GDYO has been synthesized via the surface oxidation of GDY, and the antibacterial acti...

Photoelectrochemical Solar water splitting: the role of the carbon nano materials in bismuth vanadate composite photoanodes towards efficient charge separation and transport.

Photoelectrochemical performance of bismuth vanadate (BiVO4) photoanode is limited by poor charge separation and transport properties. The role of carbon nanotube, reduced graphene oxide or graphitic carbon nitride in BiVO4 composite photoanode were investigated towards enhancing light absorption and reducing overall impedance during photo electrochemical water oxidation process. The XRD and Tauc analysis showed that the BiVO¬4 retains its monoclinic phase, n type semiconductor nature and band gap in all c...


Synergistic antibacterial activity of silver nanoparticles and hydrogen peroxide.

The increasing challenge of antibiotic resistance requires not only the discovery of new antibiotics, but also the development of new alternative approaches. Herein, the synergistic antibacterial activity of silver nanoparticles and hydrogen peroxide combination is reported. Unlike the bacteriostatic or slightly bactericidal activity achieved by using each agent alone, using these two agents in combination, even at relatively low concentrations, resulted in complete eradication of both the Gram negative Esc...

Ultrathin g-CN with enriched surface carbon vacancies enables highly efficient photocatalytic nitrogen fixation.

An ultra-thin carbon nitride with loose structure and more carbon defects on the surface was achieved through high-temperature peeling methods. Its composition, morphological characteristics, surface defect types and electrochemical properties have been measured. After atomic scale structure control and surface defects construction, the photocatalytic activity of prepared g-CN-V for ammonia conversion from dinitrogen can be greatly improved in contrast with bulk g-CN. Under visible light irradiation, the de...

Acidity-activated Charge-convertible Silver Nanocomposites for Enhanced Bacteria-specific Aggregation and Antibacterial Activity.

Bacterial infections has become an intractable problem to human health. To overcome this challenge, we developed an antimicrobial agent (AgNPs@PDPE) via the conjugation of a pH-responsive copolymer of PDMAEMA-b-PPEGMA onto AgNPs surface. The AgNPs@PDPE underwent an acidity-induced surface charge conversion that favored bacteria-specific aggregation and antibacterial activity improvement. The specific interaction between AgNPs@PDPE and bacteria under acidic conditions was confirmed via an electrochemical met...

Quantification of the charge consuming phenomena under high voltage hold of carbon/carbon supercapacitors by coupling operando and post-mortem analyses.

Enhancing the operating voltage of supercapacitors (SCs), hence their specific energy, is an important research objective. However, long-term hold at high voltage entails loss of capacitance, increase of resistance and internal pressure. Such detrimental effects could be reduced by obtaining quantitative information on the relative impact of the various mechanisms leading to the worsening of the SCs performance. Here, on the example of a carbon/carbon supercapacitor in aqueous Li2SO4, we introduce a self-co...

Boosting Supercapacitor Performance of Graphene by Coupling with Nitrogen-Doped Hollow Carbon Frameworks.

Graphene as a suitable electrode has been extensively used for electrochemical double-layer capacitors based on its excellent properties including high electrical conductivity and large specific surface area. However, one of the drawbacks is the unavoidable stacking tendency between the graphene nanosheets, resulting in limited electrochemically specific surface area. Herein, the novel graphene nanosheets supported by hollow nitrogen-doped carbon frameworks derived from ZIF-8 (i.e. GPNC) were fabricated to ...

Copper/carbon hybrid nanozyme: tuning catalytic activity by copper state for antibacterial therapy.

Metal-carbon hybrid materials have shown promise as potential enzyme mimetics for antibacterial therapy; however, the effects of metal states and corresponding antibacterial mechanisms are largely unknown. Here, two kinds of copper/carbon nanozymes were designed, with tuned copper states from Cu0 to Cu2+. Results revealed that the copper/carbon nanozymes exhibited copper state-dependent peroxidase-, catalase-, and superoxide dismutase-like activities. Furthermore, the antibacterial activities were also prim...

Antibacterial effects of graphene- and carbon-nanotube-based nanohybrids on Escherichia coli: Implications for treating multidrug-resistant bacteria.

Some nanomaterials including Fe, Ag, and ZnO are well known for their antibacterial effects. However, very few studies have examined antibacterial effects of nanohybrids. Given that metal oxides, mainly ZnO and TiO, are known to increase mobility, surface area, and photocatalysis when combined with carbon-based nanomaterials, ZnO- and TiO-conjugated carbon nanotube and graphene oxide nanohybrids were investigated for their antibacterial effects on Escherichia coli (DH5α, a multidrug-resistant coliform bact...

Structural characterization and biological activity of Crabrolin peptide isoforms with different positive charge.

The search of antimicrobial peptides (AMP) as candidates for the development of antibiotics is an active research field. In this paper we investigated the role of charged residues in antimicrobial activity by using as a template the previously characterized crabrolin peptide. Mutant peptides in which the charge was diminished (Crabrolin Minus) or increased (Crabrolin Plus) were assayed for their ability to inhibit bacterial growth and to bind model bacterial membranes or lipopolysaccharide (LPS). Structural...

Physicochemical characteristics that affect carbon dot safety: lessons from a comprehensive study on a nanoparticle library.

Carbon dots (CDs) are emerging nanomaterial in medicine and pharmacy. To explore the impact of physicochemical characteristics on their safety, we synthesized a library of 35 CDs exhibiting different size, charge, chemical composition and surface coating, using various starting materials (carbon source and passivation reagent) and carbonization procedures. The 35 CDs triggered different levels of viability loss when incubated with human macrophages at 3-200 µg/mL for 24 h. The smaller NPs (10-20 nm) were m...

A hierarchical nanostructural coating of amorphous silicon nitride on polyetheretherketone with antibacterial activity and promoting responses of rBMSCs for orthopedic applications.

Silicon nitride (SN) with good osteoconductivity has been introduced as an implantable biomaterial for joint replacement and interbody fusion devices. In this study, SN was coated on a polyetheretherketone (PEEK) surface by inductively coupled plasma-enhanced chemical vapor deposition (ICPECVD). The results showed that a dense coating (thickness of about 500 nm) of amorphous SN was closely combined with a PEEK substrate (PKSN) with a binding strength of 6.88 N. In addition, the coating surface showed hierar...

Fluorescent carbon dots functionalization.

Carbon dots (CDs), as a new type of luminescent zero-dimensional carbon nanomaterial, have been applied in a variety of fields. Currently, functionalization of CDs is an extremely useful method for effectively tuning their intrinsic structure and surface state. Heteroatom doping and surface modification are two functionalization strategies for improving the photophysical performance and broadening the range of applications for fluorescent CDs. Heteroatom doping in CDs can be used to tune their intrinsic pro...

Ag Nanoparticles Decorated Electrospinning Carbon Nanotubes/Polyamide Nanofibers.

Antibacterial composite nanofibers have recently been widely applied in biomedical fields. The purpose of this study is to combine Polyamide66 (PA) with carbon nanotubes (CNTs) and Ag nanoparticles through electrospinning and the aqueous reduction method to synthesis Ag@CNT/PA composite nanofibers with excellent conductivity, antibacterial property and cytocompatibility. The morphology and structure of Ag@CNT/PA composite nanofibers were analyzed by a series of characterizations. Conductivity of Ag@CNT/PA c...

The role of interface ions in the control of water transport through a carbon nanotube.

Controlling the water transport towards a given direction is still challenging, particularly due to thermal fluctuations of water motion at the nanoscale. While most of previous work focuses on the symmetric hydrophobic membrane systems, the role of membrane in affecting the water transport remains largely unexplored. In this work, by using extensive molecular dynamics simulations, we find an interesting electro-pumping phenomenon, i.e., the flowing counterions on an asymmetric hydrophobic-hydrophilic membr...

A simultaneous grafting/vinyl polymerization process generates a polycationic surface for enhanced antibacterial activity of bacterial cellulose.

Bacterial cellulose (BC) is a biosynthesized carbohydrate polymer with excellent biocompatibility and water holding capability. However, it lacks an inherent antibacterial activity that has limited its in-depth biomedical applications. This study investigated a novel strategy of adopting a simultaneous process to chemically anchor a quaternary ammonium salt (R-N(CH)) with a special vinyl group (2-methacryloyloxyethyl trimethylammonium chloride, METAC) onto the BC, and meanwhile, enhance the density of (R-N(...

Oxygen Functionalized and Ni+x(x=2,3) Coordinated Graphitic Carbon Nitride Nanosheets with Long Life Deep-Trap States and its Direct Solar-light-driven Hydrogen Evolution Activity.

Graphitic carbon nitride, a two-dimensional layered photocatalyst, coupled with transition metal oxides often shows promising photocatalytic hydrogen evolution activity. However, low surface area and poor charge separation largely hinder its photocatalytic efficiency. Herein, a Ni+x(x=2,3)/O-g-C3N4 photocatalysts with very high specific surface area (199m2/g) is prepared by thermal condensation and wet-impregnation methods. The O-functionalized and Ni+x(x=2,3) coordinated g-C3N4 exhibited 1664 µmoles/g of ...

Enhancement of Bactericidal Activity via Cyclic Poly(cationic liquid) Brushes.

In addition to extensive studies of conventional linear poly(ionic liquids) (PILs), exploration of the effects of PIL topology, especially cyclic architecture, on bactericidal properties will expand the design possibilities for the development of excellent antibacterial surfaces. Herein, the preparation of antibacterial surfaces based on cyclic PIL brushes is reported for the first time and how the cyclic PIL architecture affects bactericidal activity is investigated. It is shown that the cyclic architectur...

Mechanism of negative surface charge formation on biochar and its effect on the fixation of soil Cd.

The studies of the mechanism of Cd fixation by biochar have mainly focused on the pore size, pH, and oxygen-containing functional groups, and few researches have paid close attention to the effect of the negative charge in biochar surface. In this paper, biochar was produced in the CO atmosphere at different pyrolysis temperatures, and the influence of the pyrolysis temperature on biochar surface charge were explored. The cause of the negative charge on the biochar surface has been analysed, and the optimal...

Pd/MXene(Ti3C2Tx)/reduced graphene oxide hybrid catalyst for methanol electrooxidation.

A key challenge in developing direct methanol fuel cells is the fabrication of electrocatalysts with high activity and long durability. Herein, we report a performance enhanced electrocatalyst of nanoscale Pd on MXene (Ti3C2Tx) and reduced graphene oxide (rGO). The mass activity of Pd/Ti3C2Tx-rGO (1: 1) hybrid toward MOR is 753 mA mg-1, which is 1.7 times than that of Pd/C (446 mA mg-1). Additionally, the current density of Pd/Ti3C2Tx-rGO (1:1) catalyst contains 212 mAmg-1 which is 9 times higher than that ...

Various methods to combine hyaluronic acid and antimicrobial peptides coatings and evaluation of their antibacterial behaviour.

To prevent bacterial adhesion and contamination, biomaterials exhibiting both antiadhesive and biocidal properties are the most promising way. However, control of the properties combination is not so easy due, in particular, to antagonist mechanisms. Antibacterial surfaces against Staphylococcus epidermidis adhesion were here elaborated by using both nisin grafting and repelling polysaccharide coating. We evaluated two strategies aiming to improve the antimicrobial peptide (AMP) immobilization parameters (i...

Flavin-Based Fluorescent Protein EcFbFP Auto-Guided Surface Display of Methyl Parathion Hydrolase in Escherichia coli.

Methyl parathion hydrolase (MPH) plays an important role in degrading a range of organophosphorus compounds. In order to display MPH on the cell surface of Escherichia coli strain RosettaBlue™, the Flavin-based fluorescent protein EcFbFP was severed as an auto-anchoring matrix. With net negative charges of EcFbFP supplying the driving forces, fusion protein MPH-EcFbFP through a two-step auto-surface display process was finally verified by (a) inner membrane translocation and (b) anchoring at outer membran...

Graphene Oxide Nanosheets versus Carbon Nanofibers: Enhancement of Physical and Biological Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Films for Biomedical Applications.

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is a microbial biodegradable polymer with a wide range of potential industrial applications. However, its biomedical uses could increase exponentially if certain physical and biological properties were enhanced without compromising on the non-cytotoxic property of this biocompatible polymer. Graphene oxide (GO) nanosheets and carbon nanofibers (CNFs) have proven to be very promising reinforcing agents for the development of new composite materials. Therefo...

Fluorescent Imidazolium-type Poly(ionic liquid)s for Bacterial Imaging and Biofilm Inhibition.

Fluorescent imidazolium-type poly(ionic liquid)s (PIL)s were synthesized by anion exchange of bromide (Br) in poly(3-butyl-1-vinylimidazolium bromide) (PIL-Br) with a fluorescent anion, 3-(4-(1,2,2-triphenylvinyl) phenoxy) propane-1-sulfonate (TPESO). Such an anion exchange provided antibacterial PILs with aggregation-induced emission (AIE) properties that simultaneously kill and image bacteria. These fluorescence and antibacterial properties could be regulated by controlling the TPESO/Br ratio. The fluores...


Quick Search