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https://www.readbyqxmd.com/read/29145103/gold-chlorophyll-a-hybrid-nanoparticles-and-chlorophyll-a-cetyltrimethylammonium-chloride-self-assembled-suprastructures-as-novel-carriers-for-chlorophyll-a-delivery-in-water-medium-photoactivity-and-photostability
#1
Vito Rizzi, Davide Vurro, Tiziana Placido, Paola Fini, Andrea Petrella, Paola Semeraro, Pinalysa Cosma
The stability of Chlorophyll a in water during prolonged exposure, at room temperature, to a neon lamp has been investigated by means of UV-vis and fluorescence spectroscopies. In addition, the Chlorophyll a (photo)stability evaluation in presence of suitable carriers has been performed in order to investigate its reactivity under the same conditions, for possible and future applications in Antimicrobial Photodynamic Therapy. Cetyltrimethylammonium chloride was chosen to solubilize Chlorophyll a in water. While, cetyltrimethylammonium chloride-capped gold nanoparticles offer a great opportunity because combine the Chlorophyll a action, used as a photosensitizer in Antimicrobial Photodynamic Therapy, with gold nanoparticles effect used in photothermal therapy...
November 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29137766/mild-synthesis-of-a-zn-ii-metal-organic-polymer-and-its-hybrid-with-activated-carbon-application-as-antibacterial-agent-and-in-water-treatment-by-using-sonochemistry-optimization-kinetic-and-isotherm-study
#2
Tahere Taghipour, Gholamreza Karimipour, Mehrorang Ghaedi, Arash Asfaram
In this work, a room temperature and short method (30min) for synthesis of nanosized rod-like metal organic polymer (MOP) has been described. Reaction of 1,4-phenylenedioxy diacetic acid with zinc salt leads to the formation of [Zn(C10H8O6)(H2O)4]n and subsequently was loaded on activated carbon following sonication and structurally characterized by FTIR, SEM, EDX and XRD analysis. The combination of this new composite with sonication was applied for rapid and efficient adsorption of Bromocresol Purple (BCP)...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29136892/green-synthesis-of-monolithic-column-incorporated-with-graphene-oxide-using-room-temperature-ionic-liquid-and-eutectic-solvents-for-capillary-electrochromatography
#3
Xin-Xin Li, Li-Shun Zhang, Chao Wang, Yan-Ping Huang, Zhao-Sheng Liu
In this work, a hybrid monolith incorporated with graphene oxide (GO) was prepared in the first time with binary green porogens of deep eutectic solvents (DESs) and room temperature ionic liquids (RTILs). GO was modified with 3-(trimethoxysilyl) propylmethacrylate (γ-MPS), and the resultant GO-MPS can be incorporated into poly (methacrylic acid-co-butylmethacrylate-co-ethylene glycol dimethacrylate) monoliths covalently. A hybrid monolithic column with high permeability and homogeneity can be achieved due to good dispersion of GO-MPS in the green solvents...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29128540/electrospun-thermosensitive-hydrogel-scaffold-for-enhanced-chondrogenesis-of-human-mesenchymal-stem-cells
#4
Alexander R Brunelle, Christopher B Horner, Karen Low, Gerardo Ico, Jin Nam
Hydrogels have shown great potential for cartilage tissue engineering applications due to their capability to encapsulate cells within biomimetic, 3-dimensional (3D) microenvironments. However, the multi-step fabrication process that is necessary to produce cell/scaffold constructs with defined dimensions, limits their off-the-shelf translational usage. In this study, we have developed a hybrid scaffolding system which combines a thermosensitive hydrogel, poly(ethylene glycol)-poly(N-isopropylacrylamide) (PEG-PNIPAAm), with a biodegradable polymer, poly(ε-caprolactone) (PCL), into a composite, electrospun microfibrous structure...
November 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29125720/charge-transfer-from-carbon-nanotubes-to-silicon-in-flexible-carbon-nanotube-silicon-solar-cells
#5
Xiaokai Li, Marina Mariano, Lyndsey McMillon-Brown, Jing-Shun Huang, Matthew Y Sfeir, Mark A Reed, Yeonwoong Jung, André D Taylor
Mechanical fragility and insufficient light absorption are two major challenges for thin flexible crystalline Si-based solar cells. Flexible hybrid single-walled carbon nanotube (SWNT)/Si solar cells are demonstrated by applying scalable room-temperature processes for the fabrication of solar-cell components (e.g., preparation of SWNT thin films and SWNT/Si p-n junctions). The flexible SWNT/Si solar cells present an intrinsic efficiency ≈7.5% without any additional light-trapping structures. By using these solar cells as model systems, the charge transport mechanisms at the SWNT/Si interface are investigated using femtosecond transient absorption...
November 10, 2017: Small
https://www.readbyqxmd.com/read/29122421/evaluating-strategies-for-reducing-scattered-radiation-in-fixed-imaging-hybrid-operating-suites
#6
Claire Miller, Daniel Kendrick, Andrew Shevitz, Ann Kim, Henry Baele, David Jordan, Vikram S Kashyap
OBJECTIVE: High-resolution fixed C-arm fluoroscopic systems allow high-quality endovascular imaging but come at a cost of greater scatter radiation generation and increased occupational exposure for surgeons. The purpose of this study was to evaluate the efficacy of two methods in reducing scattered radiation exposure. METHODS: There were 164 endovascular cases analyzed in three phases. In phase 1 (P1), baseline radiation exposure was calculated. In phase 2 (P2), staff used real-time radiation dose monitoring (dosimetry badges [RaySafe; Unfors, Hopkinton, Mass])...
November 6, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/29118890/a-novel-technique-for-the-administration-of-sub-ambient-oxygen-in-the-operating-room
#7
Asad A Khawaja, Marco Corridore, Joseph D Tobias
Hypoplastic left heart syndrome (HLHS) is a common form of congenital heart disease with abnormal development of left-sided structures of the heart. As excessive pulmonary blood flow is common prior to palliative surgical procedures, therapeutic maneuvers may be required to decrease pulmonary blood flow and augment systemic cardiac output. Respiratory manipulations to optimize the ratio of pulmonary to systemic blood flow may include techniques to induce hypercarbia or the delivery of sub-ambient concentrations of oxygen (FiO2 less than 0...
October 2017: Cardiology Research
https://www.readbyqxmd.com/read/29116775/elucidating-the-methylammonium-ma-conformation-in-mapbbr3-perovskite-with-application-in-solar-cells
#8
Carlos A López, María Victoria Martínez-Huerta, María Consuelo Alvarez-Galván, Paula Kayser, Patricia Gant, Andres Castellanos-Gomez, María T Fernández-Díaz, Francois Fauth, José A Alonso
Hybrid organic-inorganic perovskites, MAPbX3 (X = halogen), containing methylammonium (MA: CH3-NH3(+)) in the large voids conformed by the PbX6 octahedral network, are the active absorption materials in the new generation of solar cells. CH3NH3PbBr3 is a promising member with a large band gap that gives rise to a high open circuit voltage. A deep knowledge of the crystal structure and, in particular, the MA conformation inside the perovskite cage across the phase transitions undergone below room temperature, seems essential to establish structure-property correlations that may drive to further improvements...
November 8, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29116099/sensing-performances-of-pure-and-hybridized-carbon-nanotubes-zno-nanowire-networks-a-detailed-study
#9
Oleg Lupan, Fabian Schütt, Vasile Postica, Daria Smazna, Yogendra Kumar Mishra, Rainer Adelung
In this work, the influence of carbon nanotube (CNT) hybridization on ultraviolet (UV) and gas sensing properties of individual and networked ZnO nanowires (NWs) is investigated in detail. The CNT concentration was varied to achieve optimal conditions for the hybrid with improved sensing properties. In case of CNT decorated ZnO nanonetworks, the influence of relative humidity (RH) and applied bias voltage on the UV sensing properties was thoroughly studied. By rising the CNT content to about 2.0 wt% (with respect to the entire ZnO network) the UV sensing response is considerably increased from 150 to 7300 (about 50 times)...
November 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29116095/magnetic-actuation-and-feedback-cooling-of-a-cavity-optomechanical-torque-sensor
#10
P H Kim, B D Hauer, T J Clark, F Fani Sani, M R Freeman, J P Davis
Cavity optomechanics has demonstrated remarkable capabilities, such as measurement and control of mechanical motion at the quantum level. Yet many compelling applications of optomechanics-such as microwave-to-telecom wavelength conversion, quantum memories, materials studies, and sensing applications-require hybrid devices, where the optomechanical system is coupled to a separate, typically condensed matter, system. Here, we demonstrate such a hybrid optomechanical system, in which a mesoscopic ferromagnetic needle is integrated with an optomechanical torsional resonator...
November 7, 2017: Nature Communications
https://www.readbyqxmd.com/read/29113655/laparoscopic-partial-nephrectomy-following-tumor-embolization-in-a-hybrid-room-feasibility-and-clinical-outcomes
#11
Paul Panayotopoulos, Antoine Bouvier, Louis Besnier, Marie Christine Rousselet, Cosmina Nedelcu, Nathalie Baize, Laurent Beydon, Christophe Aubé, Abdel-Rahmène Azzouzi, Pierre Bigot
PURPOSE: In order to limit ischemia and operative bleeding during and after partial nephrectomy we developed a clampless laparoscopic technique, in a hybrid operating room, immediately after super-selective arterial embolization of the renal tumor. We evaluated feasibility and morbidity of this new approach of zero ischemia in partial nephrectomy. METHODS: We included prospectively 50 consecutive patients treated in a hybrid operating room by this new technique for a localized renal tumor in a university hospital between May 2015 and January 2017...
December 2017: Surgical Oncology
https://www.readbyqxmd.com/read/29107578/facile-detection-of-microrna-based-on-phosphorescence-resonance-energy-transfer-and-duplex-specific-nuclease-assisted-signal-amplification
#12
Jia-Jia Yang, Zhi-Feng Zhang, Gui-Qin Yan
MicroRNAs (miRNAs) play an important role in many biological processes, and its level in plasma and other biological fluids is closely related to many diseases. In this work, a selective room-temperature phosphorescence (RTP) detection method for miRNA was developed based on a duplex-specific nuclease (DSN) -assisted signal amplification strategy and phosphorescence resonance energy transfer (PRET) between poly-diallyldimethylammonium chloride-modified quantum dots (QDs@PDDA) and 6-carboxy-X-rhodamine-modified miRNA sequences complementary oligonucleotide (ROX-ssDNA)...
October 28, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/29106909/a-study-of-bio-hybrid-silsesquioxane-yeast-biosorption-and-neuronal-toxicity-of-lead
#13
Bianca Trama-Freitas, Johnattan C S Freitas, Rui C Martins, Licínio M Gando-Ferreira, Maria Emília Quinta-Ferreira, Rosa Maria Quinta-Ferreira, Devaney R do Carmo
Lead is a heavy metal of high impact for the environment as well as for human health, being cause of several diseases. Considering the importance of obtaining an effective treatment for lead removal, a new hybrid material was developed for sorption of Pb(2+) from aqueous solution. The effect of pH, temperature, liquid/solid ratio (g/cm(3)) and lead concentration on the sorption capacity of yeasts chemically modified with cubic silsesquioxane (YS) was analyzed. Additionally, the toxicity of lead on the neuronal activity was also investigated in order to assess whether the damage caused by the Pb(2+) ion is reversible or not...
October 26, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/29106457/rapid-loss-of-rna-detection-by-in-situ-hybridization-in-stored-tissue-blocks-and-preservation-by-cold-storage-of-unstained-slides
#14
Javier A Baena-Del Valle, Qizhi Zheng, Jessica L Hicks, Helen Fedor, Bruce J Trock, Colm Morrissey, Eva Corey, Toby C Cornish, Karen S Sfanos, Angelo M De Marzo
Objectives: Recent commercialization of methods for in situ hybridization using Z-pair probe/branched DNA amplification has led to increasing adoption of this technology for interrogating RNA expression in formalin-fixed, paraffin-embedded (FFPE) tissues. Current practice for FFPE block storage is to maintain them at room temperature, often for many years. Methods: To examine the effects of block storage time on FFPE tissues using a number of RNA in situ probes with the Advanced Cellular Diagnostic's RNAscope assay...
November 2, 2017: American Journal of Clinical Pathology
https://www.readbyqxmd.com/read/29099172/a-target-triggered-dnazyme-motor-enabling-homogeneous-amplified-detection-of-proteins
#15
Junbo Chen, Albert Zuehlke, Bin Deng, Hanyong Peng, Xiandeng Hou, Hongquan Zhang
We report here the concept of a self-powered, target-triggered DNA motor constructed by engineering a DNAzyme to adapt into binding-induced DNA assembly. An affinity ligand was attached to the DNAzyme motor via a DNA spacer, and a second affinity ligand was conjugated to the gold nanoparticle (AuNP) that was also decorated with hundreds of substrate strands serving as a high-density, three-dimensional track for the DNAzyme motor. Binding of a target molecule to the two ligands induced hybridization between the DNAzyme and its substrate on the AuNP, which are otherwise unable to spontaneously hybridize...
November 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29098860/control-of-the-switching-speed-of-photochromic-naphthopyrans-through-restriction-of-double-bond-isomerization
#16
Céu M Sousa, Jerome Berthet, Stephanie Delbaere, André Polonia, Paulo J Coelho
An efficient synthesis of photochromic fused-naphthopyrans was developed. UV-vis or sunlight irradiation of these uncolored compounds in solution led to the formation of a single colored photoisomer along with an unusual and uncolored bicyclic compound formed through an intramolecular photochemical Diels-Alder reaction. Both species faded thermally in the dark to the initial form. A mechanism for this transformation is proposed based on NMR studies of irradiated solutions. The new fused-naphthopyrans have been incorporated into hybrid organic-inorganic matrices affording light-yellow materials that develop intense red colorations under UV light and return to the initial uncolored state in just a few seconds, in the dark, at room temperature...
November 3, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29096504/modelling-realistic-tio2-nanospheres-a-benchmark-study-of-scc-dftb-against-hybrid-dft
#17
Daniele Selli, Gianluca Fazio, Cristiana Di Valentin
TiO2 nanoparticles (NPs) are nowadays considered fundamental building blocks for many technological applications. Morphology is found to play a key role with spherical NPs presenting higher binding properties and chemical activity. From the experimental point of view, the characterization of these nano-objects is extremely complex, opening a large room for computational investigations. In this work, TiO2 spherical NPs of different sizes (from 300 to 4000 atoms) have been studied with a two-scale computational approach...
October 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29095147/enhanced-performance-of-solution-processed-broadband-photodiodes-by-epitaxially-blending-mapbbr3quantum-dots-and-ternary-pbsxse1-x-quantum-dots-as-the-active-layer
#18
Muhammad Sulaman, Shengyi Yang, Yurong Jiang, Yi Tang, Bingsuo Zou
Organic-inorganic hybrid photodetectors attract more and more interests since they can combine the advantages of both organic and inorganic materials into one device, and broadband photodetectors are widely used in many scientific and industrial fields. In this work, we demonstrate the enhanced-performance solution-processed broadband photodiodes by epitaxially blending organo lead halide perovskites (MAPbBr3) colloidal quantum dots (CQDs) with ternary PbSxSe1-x CQDs as the active layer. As a result, the interfacial features of the hetero-epitaxial nanocomposite MAPbBr3:PbSxSe1-x enables the design and perception of functionalities that are not available for the single-phase constituents or layered devices...
November 2, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29094949/strong-coupling-between-self-assembled-molecules-and-surface-plasmon-polaritons
#19
J Bigeon, S Le Liepvre, S Vassant, N Belabas, N Bardou, C Minot, A Yacomotti, A Levenson, F Charra, S Barbay
We experimentally demonstrate strong coupling between self-assembled PTCDI-C7 organic molecules and the electromagnetic mode generated by surface plasmon polaritons (SPPs). The system consists of a dense self-assembly of ordered molecules evaporated directly on a thin gold film, which stack perpendicularly to the metal surface to form H-aggregates, without a host matrix. Experimental wavevector-resolved reflectance spectra show the formation of hybrid states that display a clear anticrossing, attesting the strong coupling regime with a Rabi splitting energy of ΩR ≃ 102 meV at room temperature...
November 7, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29094934/universal-dynamics-of-molecular-reorientation-in-hybrid-lead-iodide-perovskites
#20
Douglas H Fabini, Ting Ann Siaw, Constantinos C Stoumpos, Geneva Laurita, Daniel Olds, Katharine Page, Jerry G Hu, Mercouri G Kanatzidis, Songi Han, Ram Seshadri
The role of organic molecular cations in the high-performance perovskite photovoltaic absorbers, methylammonium lead iodide (MAPbI3) and formamidinium lead iodide (FAPbI3), has been an enigmatic subject of great interest. Beyond aiding in the ease of processing of thin films for photovoltaic devices, there have been suggestions that many of the remarkable properties of the halide perovskites can be attributed to the dipolar nature and the dynamic behavior of these cations. Here, we establish the dynamics of the molecular cations in FAPbI3 between 4 K and 340 K and the nature of their interaction with the surrounding inorganic cage using a combination of solid state nuclear magnetic resonance and dielectric spectroscopies, neutron scattering, calorimetry, and ab initio calculations...
November 2, 2017: Journal of the American Chemical Society
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