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https://www.readbyqxmd.com/read/28335336/oral-toxicity-and-intestinal-transport-mechanism-of-colloidal-gold-nanoparticle-treated-red-ginseng
#1
Song-Hwa Bae, Jin Yu, Mi-Ran Go, Hyun-Jin Kim, Yun-Gu Hwang, Soo-Jin Choi
(1) Background: Application of nanotechnology or nanomaterials in agricultural food crops has attracted increasing attention with regard to improving crop production, quality, and nutrient utilization. Gold nanoparticles (Au-NPs) have been reported to enhance seed yield, germination rate, and anti-oxidant potential in food crops, raising concerns about their toxicity potential. In this study, we evaluated the oral toxicity of red ginseng exposed to colloidal Au-NPs during cultivation (G-red ginseng) in rats and their intestinal transport mechanism...
November 11, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335228/fabricating-water-dispersible-superparamagnetic-iron-oxide-nanoparticles-for-biomedical-applications-through-ligand-exchange-and-direct-conjugation
#2
Tina Lam, Pramod K Avti, Philippe Pouliot, Foued Maafi, Jean-Claude Tardif, Éric Rhéaume, Frédéric Lesage, Ashok Kakkar
Stable superparamagnetic iron oxide nanoparticles (SPIONs), which can be easily dispersed in an aqueous medium and exhibit high magnetic relaxivities, are ideal candidates for biomedical applications including contrast agents for magnetic resonance imaging. We describe a versatile methodology to render water dispersibility to SPIONs using tetraethylene glycol (TEG)-based phosphonate ligands, which are easily introduced onto SPIONs by either a ligand exchange process of surface-anchored oleic-acid (OA) molecules or via direct conjugation...
May 26, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335220/pde5-inhibitors-loaded-nanovesicles-physico-chemical-properties-and-in-vitro-antiproliferative-activity
#3
Roberta F De Rose, Maria Chiara Cristiano, Marilena Celano, Valentina Maggisano, Ada Vero, Giovanni Enrico Lombardo, Martina Di Francesco, Donatella Paolino, Diego Russo, Donato Cosco
Novel therapeutic approaches are required for the less differentiated thyroid cancers which are non-responsive to the current treatment. In this study we tested an innovative formulation of nanoliposomes containing sildenafil citrate or tadalafil, phosphodiesterase-5 inhibitors, on two human thyroid cancer cell lines (TPC-1 and BCPAP). Nanoliposomes were prepared by the thin layer evaporation and extrusion methods, solubilizing the hydrophilic compound sildenafil citrate in the aqueous phase during the hydration step and dissolving the lipophilic tadalafil in the organic phase...
May 18, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335218/aggregation-and-colloidal-stability-of-commercially-available-al%C3%A2-o%C3%A2-nanoparticles-in-aqueous-environments
#4
Julie Mui, Jennifer Ngo, Bojeong Kim
The aggregation and colloidal stability of three, commercially-available, gamma-aluminum oxide nanoparticles (γ-Al₂O₃ NPs) (nominally 5, 10, and 20-30 nm) were systematically examined as a function of pH, ionic strength, humic acid (HA) or clay minerals (e.g., montmorillonite) concentration using dynamic light scattering and transmission electron microscopy techniques. NPs possess pH-dependent surface charges, with a point of zero charge (PZC) of pH 7.5 to 8. When pH < PZC, γ-Al₂O₃ NPs are colloidally stable up to 100 mM NaCl and 30 mM CaCl₂...
May 13, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335212/rapid-nanoparticle-synthesis-by-magnetic-and-microwave-heating
#5
Viktor Chikan, Emily J McLaurin
Traditional hot-injection (HI) syntheses of colloidal nanoparticles (NPs) allows good separation of the nucleation and growth stages of the reaction, a key limitation in obtaining monodisperse NPs, but with limited scalability. Here, two methods are presented for obtaining NPs via rapid heating: magnetic and microwave-assisted. Both of these techniques provide improved engineering control over the separation of nucleation and growth stages of nanomaterial synthesis when the reaction is initiated from room temperature...
May 5, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335210/application-of-l-aspartic-acid-capped-zns-mn-colloidal-nanocrystals-as-a-photosensor-for-the-detection-of-copper-ii-ions-in-aqueous-solution
#6
Jungho Heo, Cheong-Soo Hwang
Water-dispersible ZnS:Mn nanocrystals (NCs) were synthesized by capping the surface with polar L-aspartic acid (Asp) molecules. The obtained ZnS:Mn-Asp NC product was optically and physically characterized using the corresponding spectroscopic methods. The ultra violet-visible (UV-VIS) absorption spectrum and photoluminescence (PL) emission spectrum of the NCs showed broad peaks at 320 and 590 nm, respectively. The average particle size measured from the obtained high resolution-transmission electron microscopy (HR-TEM) image was 5...
April 27, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335201/size-and-shape-dependent-antibacterial-studies-of-silver-nanoparticles-synthesized-by-wet-chemical-routes
#7
Muhammad Akram Raza, Zakia Kanwal, Anum Rauf, Anjum Nasim Sabri, Saira Riaz, Shahzad Naseem
Silver nanoparticles (AgNPs) of different shapes and sizes were prepared by solution-based chemical reduction routes. Silver nitrate was used as a precursor, tri-sodium citrate (TSC) and sodium borohydride as reducing agents, while polyvinylpyrrolidone (PVP) was used as a stabilizing agent. The morphology, size, and structural properties of obtained nanoparticles were characterized by scanning electron microscopy (SEM), UV-visible spectroscopy (UV-VIS), and X-ray diffraction (XRD) techniques. Spherical AgNPs, as depicted by SEM, were found to have diameters in the range of 15 to 90 nm while lengths of the edges of the triangular particles were about 150 nm...
April 15, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334526/an-unusual-non-emissive-behavior-of-rubrene-j-aggregates-a-rare-violation
#8
Nikhil Aggarwal, Archita Patnaik
Structure - property correlations in Rubrene (RB) colloidal J-aggregates were unravelled by steady state and time resolved spectroscopy in conjunction with excited state density functional calculations. The RB J-aggregate with a slippage angle θ = 30.4(0), estimated from the monomeric transition dipole moment directions, exhibited a broad FWHM of 1073 cm(-1) and a 5 nm red shifted absorption band carrying a transition dipole moment (M ⃗_(λagg )= 1.80 D) almost equivalent to the monomeric dye (M ⃗_(λmon )=1...
March 23, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28333454/sub-structural-components-of-organic-colloids-from-a-pu-polluted-soil-with-implications-for-pu-mobilization
#9
Nicole DiDonato, Chen Xu, Peter H Santschi, Patrick G Hatcher
Contaminated soil organic matter from the Rocky Flats Environmental Technology Site (RFETS) has been previously shown to accumulate plutonium (Pu) in a colloidal sub-fraction and hypothesized to contain cutin-like chemical structures cross-linked with hydroxamate functionality. The present study further characterizes this high Pu-affinity sub-fraction using electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI-FTICRMS) and discovers additional sub-structural components. The Pu-enriched fraction was extracted and purified through a series of ultrafiltration and isoelectric focusing (IEF) electrophoresis steps...
March 23, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28332818/in-situ-preparation-of-metal-halide-perovskite-nanocrystal-thin-films-for-improved-light-emitting-devices
#10
Lianfeng Zhao, Yao-Wen Yeh, Nhu L Tran, Fan Wu, Zhengguo Xiao, Ross A Kerner, YunHui L Lin, Gregory D Scholes, Nan Yao, Barry P Rand
Hybrid organic-inorganic halide perovskite semiconductors are attractive candidates for optoelectronic applications, such as photovoltaics, light-emitting diodes, and lasers. Perovskite nanocrystals are of particular interest, where electrons and holes can be confined spatially, promoting radiative recombination. However, nanocrystalline films based on traditional colloidal nanocrystal synthesis strategies suffer from the use of long insulating ligands, low colloidal nanocrystal concentration, and significant aggregation during film formation...
March 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28332813/competitive-adsorption-of-polyelectrolytes-onto-and-into-pellicle-coated-hydroxyapatite-investigated-by-qcm-d-and-force-spectroscopy
#11
Hyun-Su Lee, Carl Myers, Lynette Zaidel, Prathima Chandra Nalam, Matthew Alexander Caporizzo, Carlo Daep, David M Eckmann, James G Masters, Russell J Composto
A current effort in preventive dentistry is to inhibit surface attachment of bacteria using antibacterial polymer coatings on the tooth surface. For the antibacterial coatings, the physisorption of anionic and cationic polymers directly onto hydroxyapatite (HA) and saliva treated HA surfaces was studied using quartz crystal microbalance, force spectroscopy and atomic force microscopy. First, single species adsorption is shown to be stronger on HA surfaces than on silicon oxide surfaces for all polymers (i.e...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332772/designing-highly-efficient-cui-photosensitizer-for-photocatalytic-h2-evolution-from-water
#12
Jaekwan Kim, Dong Ryeol Whang, Soo Young Park
A series of CuI photosensitizers was synthesized, characterized, and investigated for photocatalytic H2 evolution from water. The structure-property correlation was made for their catalytic activity and photophysical properties, which was further elaborated by DFT calculation. A novel CuI photosensitizer (Cu-TPAPhen) with triphenylamine-substituted phenanthroline ligand showed unprecedentedly high turnover number of 19,000 when tested in combination with triethylamine as a sacrificial reagent and colloidal Pt as a H2 evolution catalyst...
March 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28332691/relaxations-and-phase-transitions-during-the-collapse-of-a-dense-pnipam-microgel-suspension-thorough-insight-using-dielectric-spectroscopy
#13
Man Yang, Chunyan Liu, Yiwei Lian, Kongshuang Zhao, Dan Zhu, Jianfeng Zhou
The dielectric behavior of a thermo-sensitive poly-(N-isopropylacrylamide) (PNIPAM) microgel suspension with a dense concentration was investigated over the frequency range of 40 Hz to 110 MHz in a wide temperature window of 10-60 °C. By successfully removing the electrode polarization effect from the original data, two remarkable and temperature-dependent relaxation processes were observed. Both of the two-phase transition processes, i.e., the colloidal crystal-to-liquid transition, which has not yet been detected by dielectric spectroscopy before, as well as the volume phase transition, were detected by the relaxation parameters...
March 23, 2017: Soft Matter
https://www.readbyqxmd.com/read/28331738/sentinel-node-biopsy-in-special-histologic-types-of-invasive-breast-cancer
#14
Montserrat Solà, Mireia Recaj, Eva Castellà, Pere Puig, Josep Maria Gubern, Juan Francisco Julian, Manel Fraile
OBJECTIVE: To assess the feasibility of sentinel node biopsy (SNB) in ductal and lobular invasive breast cancer, a group of tumors known as special histologic type (SHT) of breast cancer. MATERIALS AND METHODS: Between January 1997 and July 2008, 2253 patients from 6 affiliated hospitals underwent SNB who had early breast cancer and clinically negative axilla. The patients' data were collected in a multicenter database. For lymphatic mapping, all patients received an intralesional dose of radiocolloid Tc-99m (4mCi in 0...
April 2016: J Breast Health (2013)
https://www.readbyqxmd.com/read/28330749/identification-purification-and-expression-patterns-of-chitinase-from-psychrotolerant-pedobacter-sp-pr-m6-and-antifungal-activity-in-vitro
#15
Yong-Su Song, Dong-Jun Seo, Woo-Jin Jung
In this study, a novel psychrotolerant chitinolytic bacterium Pedobacter sp. PR-M6 that displayed strong chitinolytic activity on 0.5% colloidal chitin was isolated from the soil of a decayed mushroom. Chitinase activity of PR-M6 at 25 °C (C25) after 6 days of incubation with colloidal chitin increased rapidly to a maximum level (31.3 U/mg proteins). Three chitinase isozymes (chiII, chiIII, and chiIV) from the crude enzyme at 25 °C (C25) incubation were expressed on SDS-PAGE gels at 25 °C. After purification by chitin-affinity chromatography, six chitinase isozymes (chiI, chiII, chiIII, chiIV, chiV, and chiVI) from C25-fractions were expressed on SDS-PAGE gels at 25 °C...
March 19, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28330360/on-the-origin-of-stretched-exponential-kohlrausch-relaxation-kinetics-in-the-room-temperature-luminescence-decay-of-colloidal-quantum-dots
#16
E N Bodunov, Yu A Antonov, A L Simões Gamboa
The non-exponential room temperature luminescence decay of colloidal quantum dots is often well described by a stretched exponential function. However, the physical meaning of the parameters of the function is not clear in the majority of cases reported in the literature. In this work, the room temperature stretched exponential luminescence decay of colloidal quantum dots is investigated theoretically in an attempt to identify the underlying physical mechanisms associated with the parameters of the function...
March 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28329568/localized-cutaneous-argyria-report-of-two-patients-and-literature-review
#17
Bryce David Beutler, Robert A Lee, Philip R Cohen
BackgroundLocalized cutaneous argyria is a rare skin condition caused by direct contact with silver or silver particles. It presents as asymptomatic gray or blue-gray macules that appear similar to blue nevi. Histologic features include brown-colored or black-colored silver granules in the basement membrane and dermis, most commonly surrounding eccrine glands, elastic fibers, and collagen fibrils. The condition is most frequently observed in individuals who are regularly exposed to small silver particles, such as silversmiths and welders...
November 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28328844/clinicopathological-study-on-thyroid-follicular-carcinoma-like-renal-tumor-related-to-serious-hypertension-case-report-and-review-of-the-literature
#18
Hui Wang, Jianpeng Yu, Zhonghua Xu, Gang Li
RATIONALE: Thyroid carcinoma-like tumor of the kidney (TLFCK) is an extremely rare variant of renal cell carcinoma. Most cases were incidentally found, while we report the first case of TLFCK presented with hypertension. PATIENT CONCERNS: A 25-year-old woman was admitted to our hospital presenting with hypertension for ∼20 months, without gross hematuria, weight loss, and flank pain. DIAGNOSES: Imaging studies revealed a right renal mass with multiple calcifications...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28328197/dual-band-electrochromic-devices-based-on-nb-doped-tio2-nanocrystalline-electrodes
#19
Mariam Barawi, Luca De Trizio, Roberto Giannuzzi, Giulia Veramonti, Liberato Manna, Michele Manca
The reliable exploitation of localized surface plasmon resonance in transparent conductive oxides is being prospected to push the blooming of an emerging class of advanced dynamic windows, which offer the opportunity to selectively, and dynamically, control the intensity of the incoming thermal radiation without affecting visible transparency. In this view, Nb-doped TiO2 colloidal nanocrystals are particularly promising as they have a wide bandgap and their plasmonic features can be finely tailored across the near infrared region by varying the concentration of dopants...
March 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28328073/surfactant-assisted-stabilization-of-au-colloids-on-solids-for-heterogeneous-catalysis
#20
Wangcheng Zhan, Yuan Shu, Yujie Sheng, Huiyuan Zhu, Yanglong Guo, Li Wang, Yun Guo, Jinshui Zhang, Guanzhong Lu, Sheng Dai
The stabilization of surfactant-assisted synthesized colloidal noble metal nanoparticles (NPs, such as Au NPs) on solids is a promising strategy for preparing supported nanocatalysts for heterogeneous catalysis because of their uniform particle sizes, controllable shapes, and tunable compositions. However, surfactant removal to obtain clean surfaces for catalysis through traditional approaches (such as solvent extraction and thermal decomposition) can easily induce the sintering of NPs, greatly hampering their use in synthesis of novel catalysts...
March 22, 2017: Angewandte Chemie
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