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https://www.readbyqxmd.com/read/28098304/real-time-monitoring-of-plasmon-induced-dissociative-electron-transfer-to-the-potential-dna-radiosensitizer-8-bromoadenine
#1
R Schürmann, I Bald
The excitation of localized surface plasmons in noble metal nanoparticles (NPs) results in different nanoscale effects such as electric field enhancement, the generation of hot electrons and a temperature increase close to the NP surface. These effects are typically exploited in diverse fields such as surface-enhanced Raman scattering (SERS), NP catalysis and photothermal therapy (PTT). Halogenated nucleobases are applied as radiosensitizers in conventional radiation cancer therapy due to their high reactivity towards secondary electrons...
January 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28097599/biosynthesis-characterization-and-bioactivities-evaluation-of-silver-and-gold-nanoparticles-mediated-by-the-roots-of-chinese-herbal-angelica-pubescens-maxim
#2
Josua Markus, Dandan Wang, Yeon-Ju Kim, Sungeun Ahn, Ramya Mathiyalagan, Chao Wang, Deok Chun Yang
A facile synthesis and biological applications of silver (DH-AgNps) and gold nanoparticles (DH-AuNps) mediated by the aqueous extract of Angelicae Pubescentis Radix (Du Huo) are explored. Du Huo is a medicinal root belonging to Angelica pubescens Maxim which possesses anti-inflammatory, analgesic, and antioxidant properties. The absorption spectra of nanoparticles in varying root extract and metal ion concentration, pH, reaction temperatures, and time were recorded by ultraviolet-visible (UV-Vis) spectroscopy...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28094997/combined-inkjet-printing-and-infra-red-sintering-of-silver-nanoparticles-using-a-swathe-by-swathe-and-layer-by-layer-approach-for-3-dimensional-structures
#3
Jayasheelan Vaithilingam, Marco Simonelli, Ehab Saleh, Nicola Senin, Ricky D Wildman, Richard J M Hague, Richard K Leach, Christopher J Tuck
Despite the advancement of additive manufacturing/3-dimensional (3D) printing, single-step fabrication of multifunctional parts using AM is limited. With the view of enabling multifunctional AM (MFAM), in this study, sintering of metal nanoparticles was performed to obtain conductivity for continuous line inkjet printing of electronics. This was achieved using a bespoke three dimensional (3D) inkjet-printing machine, JETx®, capable of printing a range of materials and utilizing different post processing procedures to print multi-layered 3D structures in a single manufacturing step...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28091783/lifetime-based-oxygen-sensing-properties-of-palladium-ii-and-platinum-ii-meso-tetrakis-4-phenylethynyl-phenylporphyrin
#4
Emel Önal, Stephan Saß, Jeanne Hurpin, Kadriye Ertekin, Sevinc Zehra Topal, Michael U Kumke, Catherine Hirel
High oxygen permeable [poly(TMSP)] nanofibers incorporating porphyrin macrocycle as luminescence indicators were prepared by electrospinning technique. The porphyrins involves were modified by i) introducing phenylacetylide substituents on the para position of the phenyl moieties and ii) varying the metal centers [Pt(II) or Pd(II)] of the meso-tetrakisphenylporphyrins. A set of nanofibers; (Pt-TPP)NF, (Pd-TPP)NF, (Pt-TPA)NF and (Pd-TPA)NF were obtained to study their structure-activity relationship toward oxygen...
January 14, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28091676/hemispherical-platinum%C3%A2-%C3%A2-silver-core%C3%A2-%C3%A2-shell-nanoparticles-for-mirna-detection
#5
Elaine Spain, Kellie Adamson, Mohammad Elshahawy, Isabella Bray, Tia E Keyes, Raymond L Stallings, Robert J Forster
Defects within a self-assembled monolayer (SAM) of dodecanethiol on gold have been used as nucleation sites for the electrodeposition of mushroom shaped platinum nanoparticles (PtNPs). The top surfaces of these PtNPs were then decorated with a layer of silver creating a hemispherical - platinum : silver core : shell nanoparticle (Pt-AgNP). Thiolated probe strand miRNA was then immobilised onto the upper silver surface. These regioselectively modified particles were desorbed by applying a current jump to yield nanoparticles capable of hybridising to a complementary miRNA target with electrocatalysis occurring on the non-functionalized lower surface...
January 16, 2017: Analyst
https://www.readbyqxmd.com/read/28089465/differential-bioaccumulation-patterns-of-nanosized-and-dissolved-silver-in-a-land-snail-achatina-fulica
#6
Yuanzhen Chen, Youbin Si, Dongmei Zhou, Fei Dang
With the increasing application in antimicrobial products, silver nanoparticles (AgNP) are inevitably released into the terrestrial environment, and pose potential risks to invertebrates such as land snails Achatina fulica, which take up AgNP from food and water. Here we differentiate Ag uptake biodynamic between Ag forms (i.e., PVP-AgNP vs. AgNO3) and between exposure pathways. Snails assimilated Ag efficiently from lettuce leaves pre-exposed to AgNP, with assimilation efficiencies (AEs) averaging 62-85% and food ingestion rates of 0...
January 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28088565/rapid-microwave-assisted-growth-of-silver-nanoparticles-on-3d-graphene-networks-for-supercapacitor-application
#7
S Khamlich, T Khamliche, M S Dhlamini, M Khenfouch, B M Mothudi, M Maaza
Silver nanoparticles (AgNPs) grown on a three dimensional (3d) graphene networks (GNs) has been successfully prepared by an efficient and rapid microwave-assisted growth process to form GNs/AgNPs nanocomposite electrode materials for supercapacitor application. The 3d nature of the used GNs offers a unique architecture, which creates an efficient conduction networks and maximum utilization of space and interface, and acts as a conductive layer for the deposited AgNPs. The electrochemical performances of the fabricated electrode were evaluated by cyclic voltammetry (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS) tests...
January 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088501/a-review-of-reproductive-and-developmental-toxicity-of-silver-nanoparticles-in-laboratory-animals
#8
REVIEW
Makoto Ema, Hirokazu Okuda, Masashi Gamo, Kazumasa Honda
We summarized significant effects reported in the literature on the reproductive and developmental toxicity of silver nanoparticles (AgNPs) in laboratory animals. AgNPs showed testicular/sperm toxicity in males and ovarian and embryonic toxicity in females. Maternal injection of AgNPs delayed physical development and impaired cognitive behavior in offspring. Ag was accumulated in the testes after administration of AgNPs. AgNPs were identified in the visceral yolk sac after administration during early gestation in mice...
January 11, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/28088104/biofabrication-of-size-controllable-silver-nanoparticles-a-green-approach
#9
Sireesh Babu Maddinedi, Badal Kumar Mandal, Swetha Kameswari Maddili
A facile biosynthetic approach for the size controllable production of silver nanoparticles (AgNPs) using the leaf extract of Cinnamomum tsoi as reducing and capping agent is developed. The polyphenolic functionalities present in the extract are essentially responsible for the synthesis and stabilization of AgNPs. The size and morphology of the AgNPs were effectively tuned by changing the volume of the extract. The availability of oxidized polyphenols play key role in tuning the size and morphology of the prepared NPs...
January 7, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28081356/canna-edulis-leaf-extract-mediated-preparation-of-stabilized-silver-nanoparticles-characterization-antimicrobial-activity-and-toxicity-studies
#10
S V Otari, S H Pawar, Sanjay K S Patel, Raushan K Singh, Sang-Yong Kim, Jai Hyo Lee, Liaoyuan Zhang, Jung-Kul Lee
A novel approach to synthesize silver nanoparticles (AgNPs) using leaf extract of Canna edulis Ker-Gawl. (CELE) under ambient conditions is reported here. The as-prepared AgNPs were analyzed by UV-visible spectroscopy, transmission emission microscopy, X-ray diffraction, Fourier transform-infra red spectroscopy, energy-dispersive analysis of X-ray spectroscopy, zeta potential, and dynamic light scattering. The AgNPs showed excellent antimicrobial activity against various pathogens, including bacteria and various fungi...
January 12, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28079015/chemometrics-expertise-in-the-links-between-ecotoxicity-and-physicochemical-features-of-silver-nanoparticles-environmental-aspects
#11
Miroslava A Nedyalkova, Borjana V Donkova, Vasil D Simeonov
Studies of the ecotoxicological aspects of nanomaterials in aquatic environments are scarce. Given the growing varietyof nanoparticles (NPs), along with the diversity of aquatic species and environments, the key to promoting sound risk assessment in nanoecotoxicology is understanding the mechanisms that govern the fate of NPs in aquatic environments and their behavior at the NP-biota interface. In this paper, data collected from the literature on ecotoxicological effects observed in aquatic species is discussed and analyzed using multivariate statistics techniques...
January 12, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28078343/differential-effects-of-silver-and-iron-oxide-nanoparticles-on-iapp-amyloid-aggregation
#12
Miaoyi Wang, Aleksandr Kakinen, Emily H Pilkington, Thomas P Davis, Pu Chun Ke
Recent studies have shown promise on the use of small molecules and nanoparticles (NPs) for the inhibition of protein aggregation, a hallmark of neurodegenerative diseases and type 2 diabetes (T2D). Towards this end here we show the differential effects of silver and iron oxide nanoparticles (AgNPs and IONPs) on the mesoscopic properties of human islet amyloid polypeptide (IAPP) aggregation associated with T2D. Both citrate- and branched polyethyleneimine-coated AgNPs (c-AgNPs, bPEI-AgNPs) inhibited IAPP aggregation at 500 μg mL(-1), likely through electrostatic attraction and sequestering of IAPP monomers from fibrillation...
January 12, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28076464/silver-nanoparticle-incorporation-effect-on-mechanical-and-thermal-properties-of-denture-base-acrylic-resins
#13
Ayşegül Köroğlu, Onur Şahin, Işın Kürkçüoğlu, Doğu Ömür Dede, Tonguç Özdemir, Baki Hazer
Objective: The aim of the present study was to evaluate the mechanical and thermal characteristics of two denture base acrylic resins containing silver nanoparticles (AgNPs). Material and Methods: Two different acrylic denture base resins (heat-polymerized and microwave polymerized) containing 0.3, 0.8 and 1.6 wt% AgNPs were evaluated for flexural strength, elastic modulus and impact strength. The glass transition temperature (Tg) and relative heat capacity (Cp) of the samples were determined from the Differential Scanning Calorimetry (DSC) results...
November 2016: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/28067319/c-elegans-on-a-chip-for-in-situ-and-in-vivo-ag-nanoparticles-uptake-and-toxicity-assay
#14
Jin Ho Kim, Seung Hwan Lee, Yun Jeong Cha, Sung Jin Hong, Sang Kug Chung, Tai Hyun Park, Shin Sik Choi
Nanomaterials are extensively used in consumer products and medical applications, but little is known about their environmental and biological toxicities. Moreover, the toxicity analysis requires sophisticated instruments and labor-intensive experiments. Here we report a microfluidic chip incorporated with the nematode Caenorhabditis elegans that rapidly displays the changes in body growth and gene expression specifically responsive to the silver nanoparticles (AgNPs). C. elegans were cultured in microfluidic chambers in the presence or absence of AgNPs and were consequently transferred to wedge-shaped channels, which immobilized the animals, allowing the evaluation of parameters such as length, moving distance, and fluorescence from the reporter gene...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28065747/microscopy-based-studies-on-the-interaction-of-bio-based-silver-nanoparticles-with-bombyx-mori-nuclear-polyhedrosis-virus
#15
Selvaraj Tamilselvan, Thirunavukkarasu Ashokkumar, Kasivelu Govindaraju
In the present investigation, silver nanoparticles (AgNPs) interactions with Bombyx mori Nuclear Polyhedrosis virus (BmNPV) were characterized using High-Resolution Scanning Electron Microscopy (HR-SEM), Energy Dispersive X-ray Analysis (EDAX), Transmission Electron Microscopy (TEM), Atomic Force Microcopy (AFM) and Confocal Microscope (CM). HR-SEM study reveals that the biosynthesized AgNPs have interacted with BmNPV and were found on the surface. TEM micrographs of normal and viral polyhedra treated with AgNPs showed that the nanoparticles were accumulated in the membrane and it was noted that some of the AgNPs successfully penetrated the membrane by reaching the capsid of BmNPV...
January 5, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28063819/toxicological-interactions-of-silver-nanoparticles-and-non-essential-metals-in-human-hepatocarcinoma-cell-line
#16
Renata Rank Miranda, Arandi Ginane Bezerra, Ciro Alberto Oliveira Ribeiro, Marco Antônio Ferreira Randi, Carmen Lúcia Voigt, Lilian Skytte, Kaare Lund Rasmussen, Frank Kjeldsen, Francisco Filipak Neto
Toxicological interaction represents a challenge to toxicology, particularly for novel contaminants. There are no data whether silver nanoparticles (AgNPs), present in a wide variety of products, can interact and modulate the toxicity of ubiquitous contaminants, such as nonessential metals. In the current study, we investigated the toxicological interactions of AgNP (size=1-2nm; zeta potential=-23mV), cadmium and mercury in human hepatoma HepG2 cells. The results indicated that the co-exposures led to toxicological interactions, with AgNP+Cd being more toxic than AgNP+Hg...
January 4, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28059062/surface-plasmon-resonance-based-fiber-optic-trichloroacetic-acid-sensor-utilizing-layer-of-silver-nanoparticles-and-chitosan-doped-hydrogel
#17
Vivek Semwal, Anand M Shrivastav, Banshi D Gupta
In this study, we report a silver nanoparticles/chitosan doped hydrogel-based fiber optic sensor for the detection of trichloroacetic acid (TCA). The sensor is based on the combined phenomenon of localized and propagating surface plasmons. The sensing relies on the interaction of TCA with silver nanoparticles (AgNP) which results in the electron transfer between the negative group of TCA and positive amino group of AgNP stabilizer (chitosan). This alters the mechanical properties/refractive index of the AgNP embedded hydrogel matrix as well as the refractive index of the AgNP...
January 6, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28058451/application-of-thermospray-flame-furnace-atomic-absorption-spectrometry-for-investigation-of-silver-nanoparticles
#18
Natnicha Sirirat, Kornrawee Tetbuntad, Atitaya Siripinyanond
Thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) was applied to investigate the time-dependent absorption peak profile of various forms of silver. The thermospray flame furnace was set up with a 10-cm-long nickel tube with six holes, each 2.0 mm in diameter, to allow the flame to enter, and this nickel tube acted as a furnace. A sample of 300 μL was introduced into this furnace by use of water as a carrier at a flow rate of 0.5 mL min(-1) through the ceramic capillary (0.5-mm inner diameter and 2...
January 5, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28055263/digestive-cell-lysosomes-as-main-targets-for-ag-accumulation-and-toxicity-in-marine-mussels-mytilus-galloprovincialis-exposed-to-maltose-stabilised-ag-nanoparticles-of-different-sizes
#19
A Jimeno-Romero, E Bilbao, U Izagirre, M P Cajaraville, I Marigómez, M Soto
Bioavailability and toxicity of maltose-stabilised AgNPs of different sizes (20, 40 and 100 nm) in mussels were compared with bulk and aqueous forms of the metal through a two-tier experimental approach. In the 1(st) tier, mussels were exposed for 3 d to a range of concentrations (0.75, 75, 750 µg Ag/l) in the form of Ag20-Mal, Ag40-Mal, Ag100-Mal, bulk Ag and aqueous Ag (as AgNO3), as well as to the concentrations of maltose used in the formulation of NPs. Mortality, bioaccumulation, tissue and cell distribution and lysosomal responses were investigated...
January 5, 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28054367/development-of-an-uplc-ms-ms-method-for-routine-therapeutic-drug-monitoring-of-aripiprazole-amisulpride-olanzapine-paliperidone-and-ziprasidone-with-a-discussion-of-their-therapeutic-reference-ranges-for-chinese-patients
#20
Shao-Ting Wang, Yan Li
A highly feasible and reliable ultra-high performance liquid chromatography tandem mass spectrometry method was presented for therapeutic drug monitoring of five anti-schizophrenic drugs (amisulpride, olanzapine, aripiprazole, paliperidone and ziprasidone) simultaneously. To meet the requirements of practical clinical usage (easy-handling, high-throughput and cost effective), the pretreatment process has been especially simplified (only including protein precipitation and mobile phase dilution steps) and the UPLC separation cycle was set within 6 minutes...
January 5, 2017: Biomedical Chromatography: BMC
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