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https://www.readbyqxmd.com/read/29035769/transport-and-long-term-release-behavior-of-polymer-coated-silver-nanoparticles-in-saturated-quartz-sand-the-impacts-of-input-concentration-grain-size-and-flow-rate
#1
Jun Hou, Mingzhi Zhang, Peifang Wang, Chao Wang, Lingzhan Miao, Yi Xu, Guoxiang You, Bowen Lv, Yangyang Yang, Zhilin Liu
This study investigated the transport and long-term release of stabilized poly vinylpyrrolidone-coated silver nanoparticles (PVP-AgNPs) in a quartz sand column with various sand grain sizes (0.3-0.5 μm, 0.5-1.0 μm, 1.0-2.0 μm), input concentrations of PVP-AgNP solution (1, 5, 15, 25 mg/L), and flow rates corresponding to a filter velocities (1.0, 1.5, 2.0, 2.5 mL/min-0.14, 0.21, 0.28, 0.35 cm/min) by determining breakthrough curves, retention profiles, and long-term release curves. Breakthrough curves and retention profiles were simulated by a mathematical model based on the advection dispersion equation coupled with second-order kinetics...
October 9, 2017: Water Research
https://www.readbyqxmd.com/read/29031405/life-span-resolved-nanotoxicology-enables-identification-of-age-associated-neuromuscular-vulnerabilities-in-the-nematode-caenorhabditis-elegans
#2
Annette Piechulek, Anna von Mikecz
At present, the majority of investigations concerning nanotoxicology in the nematode C. elegans address short-term effects. While this approach allows for the identification of uptake pathways, exposition and acute toxicity, nanoparticle-organism interactions that manifest later in the adult life of C. elegans are missed. Here we show that a microhabitat composed of liquid S-medium and live bacteria in microtiter wells prolongs C. elegans longevity and is optimally suited to monitor chronic eNP-effects over the entire life span (about 34 days) of the nematode...
October 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29030192/polyvinyl-alcohol-sodium-alginate-integrated-silver-nanoparticles-as-probable-solution-for-decontamination-of-microbes-contaminated-water
#3
M A Abu-Saied, Tarek H Taha, Nehal M El-Deeb, Elsayed E Hafez
It is well known that the pathogenic multidrug resistant microbes are highly distributed and transferred to human through contaminated food and water. Advanced technologies have been developed for controlling these microbes using synthesized nanoparticles. In this study, bio-synthesized silver nanoparticles were prepared, characterized and integrated with two synthetic and natural polymers. The polymers-silver nanoparticles were characterized using SEM, FTIR and mechanical properties of the membrane synthesized from either polymers with/without nanosilver...
October 10, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29029321/rapid-novel-facile-biosynthesized-silver-nanoparticles-from-bacterial-release-induce-biogenicity-and-concentration-dependent-in-vivo-cytotoxicity-with-embryonic-zebrafish-a-mechanistic-insight
#4
Suresh K Verma, Ealisha Jha, Pritam Kumar Panda, Anurag Mishra, Arun Thirumurugan, Biswadeep Das, S K S Parashar, Mrutyunjay Suar
In this study, rapid one step facile synthesis of silver nanoparticles (AgNP) was done using culture supernatant of two Gram positive (B.thuringiensis, S.aureus) and Gram negative (E.coli, S.typhimurium) bacterial strains and were termed as "BTAgNP", "SAAgNP", "ECAgNP" and "STAgNP" respectively. Synthesized AgNPs were well characterized with the help of different standard techniques like FESEM, DLS, UV-Vis spectroscopy and FTIR. Mechanism of AgNPs synthesis was elucidated using in silico approach. In vivo cytotoxicity of synthesized AgNPs was assessed in embryonic Zebrafish model with the help of uptake, oxidative stress and apoptosis induction experimental assays and the mechanism was investigated through in silico approach at the molecular level...
September 28, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/29028495/non-cytotoxic-effect-of-green-synthesized-silver-nanoparticles-and-its-antibacterial-activity
#5
B Senthil, T Devasena, B Prakash, A Rajasekar
Silver nanoparticles (AgNPs) were green synthesized using ethanolic extract of fenugreek leaves and characterized using UV-Vis spectroscopy, Fourier transform infra-red spectroscopy (FTIR), X-ray diffraction (XRD), high resolution transmission electron microscopy HRTEM and energy dispersive X-ray analysis (EDX) techniques. The HRTEM results revealed the formation of highly stable, mono dispersed, spherical shaped AgNPs with the size ranging from 20 to 30nm. The presence of flavonoids and their interaction with the AgNPs were confirmed using FTIR...
October 7, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29026956/peptide-self-assembly-assisted-signal-labeling-for-an-electrochemical-assay-of-protease-activity
#6
Xiangyang Miao, Huizhen Yu, Zhun Gu, Lili Yang, Jiahuan Teng, Ya Cao, Jing Zhao
Peptide self-assembly holds tremendous promise for a range of applications in chemistry and biology. In the work reported here, we explored the potential functions of peptide self-assembly in electrochemical bioanalysis by developing a peptide self-assembly assisted signal labeling strategy for assaying protease activity. The fundamental principle of this assay is that target-protease-catalyzed specific proteolytic cleavage blocks self-assembly between the probe peptide and signal peptide, thus preventing the signal labeling of electroactive silver nanoparticles on the electrode surface, which in turn causes the electrochemical signal to decrease...
October 12, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29026063/morphological-transformation-induced-by-silver-nanoparticles-in-balb-c-3t3-a31-1-1-mouse-cell-model-to-evaluate-in-vitro-carcinogenic-potential
#7
Wun Hak Choo, Byeonghak Moon, Sulhwa Song, Seung Min Oh
Carcinogenesis is a complex process involving in genotoxic and non-genotoxic pathways. Carcinogenic potential of AgNPs has been predicted by genotoxic effects using several in vitro and in vivo models. However, there is no little information on non-genotoxic effects of AgNPs for carcinogenesis. In vitro cell transformation assay (CTA) can provide specific and sensitive evidence to predict the tumorigenic potential of a chemical, which cannot be supplied by genotoxicity testing. Therefore, we carried out CTA in Balb/c 3T3 A31-1-1 cells to evaluate the carcinogenic potential of silver nanoparticle (AgNPs)...
October 7, 2017: Environmental Health and Toxicology
https://www.readbyqxmd.com/read/29024556/synthesis-of-metal-nanoparticles-in-metal-phenolic-networks-catalytic-and-antimicrobial-applications-of-coated-textiles
#8
Gyeongwon Yun, Shuaijun Pan, Ting-Yi Wang, Junling Guo, Joseph J Richardson, Frank Caruso
The synthesis of metal nanoparticle (NP)-coated textiles (nanotextiles) is achieved by a dipping process in water without toxic chemicals or complicated synthetic procedures. By taking advantage of the unique nature of tannic acid, metal-phenolic network-coated textiles serve as reducing and stabilizing sites for the generation of metal nanoparticles of controllable size. The textiles can be decorated with various metal nanoparticles, including palladium, silver, or gold, and exhibit properties derived from the presence of the metal nanoparticles, for example, catalytic activity in water (>96% over five cycles using palladium nanoparticles) and antibacterial activity against Gram-negative bacteria (inhibition of Escherichia coli using silver nanoparticles) that outperforms a commercial bandage...
October 12, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29022401/green-synthesis-of-silver-nanoparticles-using-transgenic-nicotiana-tabacum-callus-culture-expressing-silicatein-gene-from-marine-sponge-latrunculia-oparinae
#9
Yuri N Shkryl, Galina N Veremeichik, Dmitriy G Kamenev, Tatiana Y Gorpenchenko, Yulia A Yugay, Dmitriy V Mashtalyar, Aleksander V Nepomnyaschiy, Tatiana V Avramenko, Aleksandr A Karabtsov, Vladimir V Ivanov, Victor P Bulgakov, Sergey V Gnedenkov, Yury N Kulchin, Yury N Zhuravlev
In the present investigation, transgenic tobacco callus cultures and plants overexpressing the silicatein gene LoSilA1 from marine sponge Latrunculia oparinae were obtained and their bioreduction behaviour for the synthesis of silver nanoparticles (AgNPs) was studied. Synthesized nanoparticles were characterized using UV-visible spectroscopy, Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic flame electron microscopy (AFM) and nanoparticle tracking analysis (NTA)...
October 12, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29021732/nanoparticle-size-distribution-quantification-results-of-a-small-angle-x-ray-scattering-inter-laboratory-comparison
#10
Brian R Pauw, Claudia Kästner, Andreas F Thünemann
This paper presents the first worldwide inter-laboratory comparison of small-angle X-ray scattering (SAXS) for nanoparticle sizing. The measurands in this comparison are the mean particle radius, the width of the size distribution and the particle concentration. The investigated sample consists of dispersed silver nanoparticles, surrounded by a stabilizing polymeric shell of poly(acrylic acid). The silver cores dominate the X-ray scattering pattern, leading to the determination of their radius size distribution using (i) the generalized indirect Fourier transformation method, (ii) classical model fitting using SASfit and (iii) a Monte Carlo fitting approach using McSAS...
October 1, 2017: Journal of Applied Crystallography
https://www.readbyqxmd.com/read/29020531/mechanisms-of-antibiotic-resistance-in-bacteria-mediated-by-silver-nanoparticles
#11
Chitrada Kaweeteerawat, Preeyawis Na Ubol, Sanirat Sangmuang, Sasitorn Aueviriyavit, Rawiwan Maniratanachote
Silver nanoparticles (AgNPs) are widely used in industry, consumer products, and medical appliances due to their efficient antimicrobial properties. However, information on environmental toxicity and bacterial impact of these particles is not completely elucidated. Results showed that AgNPs produced growth inhibition and oxidative stress in bacteria Escherichia coli (gram negative) and Staphylococcus aureus (gram positive), with half-maximal inhibitory concentrations (IC50) of 12 and 7 mg/L, respectively. Surprisingly, bacteria pre-exposed to sublethal dose of AgNPs exhibited increased resistance toward antibiotics (ampicillin and Pen-Strep) with IC50 elevated by 3-13-fold...
October 11, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/29019663/tracking-the-transformation-of-nanoparticulate-and-ionic-silver-at-environmentally-relevant-concentration-levels-by-hollow-fiber-flow-field-flow-fractionation-coupled-to-icpms
#12
Zhiqiang Tan, Yongguang Yin, Xiaoru Guo, Meseret Amde, Myeong Hee Moon, Jing-Fu Liu, Guibin Jiang
It is a great challenge to monitor the physical and chemical transformation of nanoparticles at environmentally relevant concentration levels, mainly because the commonly used techniques like dynamic light scattering and transmission electron microscope are unable to characterize and quantify trace level nanoparticles in complex matrices. Herein, we demonstrate the on-line coupled system of hollow fiber flow field-flow fractionation (HF5), mini-column concentration and inductively coupled plasma mass spectrometry (ICPMS) detection as an efficient approach to study the aggregation, and chemical transformation of silver nanoparticles (AgNPs) and ionic Ag species in the aqueous environment at ng/mL levels...
October 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29019468/silver-and-gold-nanoparticles-in-nanometric-confined-templates-synthesis-and-alloying-within-the-anisotropic-pores-of-oblique-angle-deposited-films
#13
Julian Parra-Barranco, Juan Ramon Sanchez-Valencia, Angel Barranco, Agustin Rodriguez Gonzalez-Elipe
In this work we have developed an infiltration methodology to incorporate metal nanoparticles (NPs) with controlled size and shapes into the open voids available in Oblique Angle Deposited (OAD) thin films. These NPs exhibited well-defined surface plasmon resonances (SPR). The nanometric confined space provided by their porous microstructure has been used as a template for the growth of anisotropic NPs with interesting surface plasmon resonance properties. The fabrication methodology has been applied for the preparation of films with embedded silver and gold NPs with two associated plasmon resonance features that developed a dichroic behaviour when examined with linearly polarized light...
October 11, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29018639/managing-heart-failure-at-home-with-point-of-care-diagnostics
#14
Paul R Degregory, Jansen Tapia, Tammy Wong, Jo Villa, Ian Richards, Richard M Crooks
The objective of this paper is development of an inexpensive point-of-care sensor for detecting the primary heart failure marker peptide, NT-proBNP. The device technology is based on an antibody sandwich assay, but with three innovative aspects. First, chemical amplification is carried out via oxidation of silver nanoparticles (NPs) attached to signaling antibodies rather than by enzymatic amplification. The electrochemical method is faster and eliminates the need for long-term storage of enzymes. Second, the antibody sandwich is formed on mobile magnetic beads...
2017: IEEE Journal of Translational Engineering in Health and Medicine
https://www.readbyqxmd.com/read/29017879/preparation-of-poly-lactide-lignin-silver-nanoparticles-composite-films-with-uv-light-barrier-and-antibacterial-properties
#15
Shiv Shankar, Jong-Whan Rhim, Keehoon Won
Organosolv lignin was used as a reducing agent for the preparation of silver nanoparticles (AgNPs) and their incorporation into poly(lactide) (PLA) polymer to prepare composite films. The composite films were characterized using UV-vis spectroscopy, FE-SEM, FTIR, XRD, and TGA. The optical, mechanical, water vapor barrier, and antibacterial properties of the composite films were evaluated. The UV-vis spectra of films exhibited two characteristics peaks around 300 and 450nm attributed to lignin and AgNPs, respectively...
October 7, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29017014/effect-of-initial-speciation-of-copper-and-silver-based-nanoparticles-on-their-long-term-fate-and-phytoavailability-in-freshwater-wetland-mesocosms
#16
John P Stegemeier, Astrid Avellan, Gregory V Lowry
Ag0 and CuO engineered nanomaterials (ENMs), or their sulfidized forms are introduced into freshwater wetlands through wastewater effluent and agricultural runoff. Knowledge about the rates of transformations of these ENMs in realistic environments, and the impact of the form of the incoming ENM (i.e. sulfidized or pristine) on bioavailability and fate is limited. Here, five freshwater wetland mesocosms were exposed to 3g of total metal as CuO, CuS, Ag0 or Ag2S ENMs, or soluble CuNO3, added weekly for one month...
October 10, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28994840/silica-nanowire-assemblies-as-three-dimensional-optically-transparent-platforms-for-constructing-highly-active-sers-substrates
#17
Yinghua Liu, Chao Deng, Deliang Yi, Xingdong Wang, Yi Tang, Yajun Wang
Three-dimensional surface-enhanced Raman scattering (SERS) substrates are prepared via the in situ deposition of silver nanoparticles (AgNPs) on silica nanowire (SiO2 NW) assemblies, either in a free-standing membrane structure or as an optically transparent film supported on Scotch tape. The negatively charged surface of the SiO2 NW favors Ag(+) ion enrichment around itself, with the ions forming densely deposited AgNPs on the NW after reducing agents are added to the solution. A SERS substrate with high sensitivity is achieved owing to abundant "hot spots" generated by the inter-AgNP gaps in the 3D geometry of the NW networks...
October 10, 2017: Nanoscale
https://www.readbyqxmd.com/read/28994738/single-silver-nanoparticle-instillation-induced-early-and-persisting-moderate-cortical-damage-in-rat-kidneys
#18
Elisa Roda, Sergio Barni, Aldo Milzani, Isabella Dalle-Donne, Graziano Colombo, Teresa Coccini
The potential toxic effects of silver nanoparticles (AgNPs), administered by a single intratracheal instillation (i.t), was assessed in a rat model using commercial physico-chemical characterized nanosilver. Histopathological changes, overall toxic response and oxidative stress (kidney and plasma protein carbonylation), paralleled by ultrastructural observations (TEM), were evaluated to examine renal responses 7 and 28 days after i.t. application of a low AgNP dose (50 µg/rat), compared to an equivalent dose of ionic silver (7 µg AgNO₃/rat)...
October 10, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28994723/middle-ear-prosthesis-with-bactericidal-efficacy-in-vitro-investigation
#19
Magdalena Ziąbka, Michał Dziadek, Elżbieta Menaszek, Rafał Banasiuk, Aleksandra Królicka
Materials used in ossicular replacement prostheses must possess appropriate biological properties, such as biocompatibility, stability, no cytotoxicity. Due to the risk of infection (otitis media and chronic otitis media), it is desirable to use an antibacterial agent for illness prevention during the ossicular reconstruction. The goal of this work was to observe biological properties of a new composite prosthesis made of ABS containing silver nanoparticles (AgNPs 45T). Samples for biological tests and then a prototype of middle ear prosthesis were prepared using injection moulding and extrusion techniques...
October 10, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28994573/preparation-of-a-sulfur-functionalized-microporous-polymer-sponge-and-in-situ-growth-of-silver-nanoparticles-a-compressible-monolithic-catalyst
#20
Jong Gil Kim, Min Chul Cha, Jeongmin Lee, Taejin Choi, Ji Young Chang
We report a compressible monolithic catalyst based on a microporous organic polymer (MOP) sponge. The monolithic MOP sponge was synthesized via Sonogashira-Hagihara coupling reaction between 1,4-diiodotetrafluorobenzene and 1,3,5-triethynylbenzene in a cosolvent of toluene and TEA (2:1, v/v) without stirring. The MOP sponge had an intriguing microstructure, where tubular polymer fibers having a diameter of hundreds of nanometers were entangled. It showed hierarchical porosity with a Brunauer-Emmett-Teller (BET) surface area of 512 m(2) g(-1)...
October 10, 2017: ACS Applied Materials & Interfaces
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