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https://www.readbyqxmd.com/read/28330300/carbon-quantum-dots-shuttle-electrons-to-the-anode-of-a-microbial-fuel-cell
#1
A S Vishwanathan, Kartik S Aiyer, L A A Chunduri, K Venkataramaniah, S Siva Sankara Sai, Govind Rao
Electrodes based on graphite, graphene, and carbon nanomaterials have been used in the anode chamber of microbial fuel cells (MFCs). Carbon quantum dots (C-dots) are a class of versatile nanomaterials hitherto not reported in MFCs. C-dots previously synthesized from coconut husk were reported to possess hydroxyl and carboxyl functional groups on their surface. The presence of these functional groups on a carbon matrix conferred on the C-dots the ability to conduct and transfer electrons. Formation of silver nanoparticles from silver nitrate upon addition of C-dots confirmed their reducing ability...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28329432/user-compliance-with-documenting-on-a-track-and-trigger-based-observation-and-response-chart-a-two-phase-multi-site-audit-study
#2
Doug Elliott, Emily Allen, Sharon McKinley, Lin Perry, Christine Duffield, Margaret Fry, Robyn Gallagher, Rick Iedema, Michael Roche
AIMS: To examine user compliance and completeness of documentation with a newly designed Observation and Response Chart and whether a rapid response system call was triggered when clinically indicated. BACKGROUND: Timely recognition and responses to patient deterioration in hospital general wards remains a challenge for health care systems globally. Evaluating practice initiatives to improve recognition and response are required. DESIGN: Two-phase audit...
March 22, 2017: Journal of Advanced Nursing
https://www.readbyqxmd.com/read/28329418/covalent-crosslinking-of-graphene-quantum-dots-by-mcmurry-deoxygenation-coupling
#3
Shaowei Chen, Limei Chen, Peiguangf Hu, Jia En Lu
Graphene quantum dots were covalently crosslinked forming ensembles of a few hundred nanometers in size by McMurry deoxygenation coupling reactions of peripheral carbonyl functional moieties catalyzed by TiCl4 and Zn powders in refluxing THF, as manifested in TEM, AFM, FTIR, Raman and XPS measurements. Photoluminescence measurements showed that after chemical coupling, the excitation and emisison peaks blue-shifted somewhat and the emission intensity increased markedly, likely due to the removal of oxygenated species where quinone-like species were known to be effective electron-acceptors and emission quenchers...
March 22, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28328548/characterization-of-hiv-seroconverters-in-a-tdf-ftc-prep-study-hptn-067-adapt
#4
Mariya V Sivay, Maoji Li, Estelle Piwowar-Manning, Yinfeng Zhang, Sarah E Hudelson, Mark A Marzinke, Rivet K Amico, Andrew Redd, Craig W Hendrix, Peter L Anderson, Kevin Bokoch, Linda Gail-Bekker, Frits van Griensven, Sharon Mannheimer, James P Hughes, Robert Grant, Susan H Eshleman
BACKGROUND: HPTN 067/ADAPT evaluated tenofovir disoproxil fumarate/emtricitabine (TDF/FTC) pre-exposure prophylaxis (PrEP) in women (South Africa) and men who have sex with men (Thailand, US). Participants received once-weekly directly observed TDF/FTC (DOT), and were then randomized to daily, time-driven, or event-driven PrEP. This report describes characterization of 12 HIV seroconversion events in this trial. METHODS: HIV rapid testing was performed at study sites...
March 22, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/28328198/all-printable-zno-quantum-dots-graphene-van-der-waals-heterostructures-for-ultrasensitive-detection-of-ultraviolet-light
#5
Maogang Gong, Qingfeng Liu, Brent Cook, Bhupal Kattel, Ti Wang, Wai-Lun Chan, Dan Ewing, Matthew Casper, Alex Stramel, Judy Z Wu
In ZnO quantum dot/graphene heterojunction photodetectors, fabricated by printing quantum dots (QDs) directly on the graphene field effect transistor (GFET) channel, the combination of the strong quantum confinement in ZnO QDs and the high charge mobility in graphene allows extraordinary quantum efficiency (or photoconductive gain) in visible-blind ultraviolet (UV) detection. Key to the high performance is a clean van der Waals interface to facilitate an efficient charge transfer from ZnO QDs to graphene upon UV illumination...
March 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28327734/band-edge-oscillator-strength-of-colloidal-cdse-cds-dot-in-rods-comparison-of-absorption-and-time-resolved-fluorescence-spectroscopy
#6
I Angeloni, W Raja, A Polovitsyn, F De Donato, R Proietti Zaccaria, I Moreels
We studied the oscillator strength fgap of the band gap transition in heteronanocrystals (hNCs) with a spherical CdSe core embedded in an elongated CdS shell. A comparison with fgap of core-only CdSe NCs confirmed a reduction of the electron-hole overlap in hNCs with a band gap larger than 2.05 eV or smaller than 1.98 eV. However, the decrease in fgap is limited to about 50% when compared to CdSe NCs, suggesting that residual confinement still localizes the electron near the core. We correlated fgap with the radiative lifetime obtained from multiexponential photoluminescence (PL) decay traces...
March 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28327652/a-facile-ultrasonic-assisted-fabrication-of-nitrogen-doped-carbon-dots-biobr-up-conversion-nanocomposites-for-visible-light-photocatalytic-enhancements
#7
Yifan Zhang, Mira Park, Hak Yong Kim, Bin Ding, Soo-Jin Park
A highly efficient novel photocatalyst consisting of nitrogen-carbon dots (N-CDs) and three-dimensional (3D) hierarchical BiOBr was synthesized via a simple ultrasonic-assisted method and used for the degradation of hazardous dyes. Deposition of N-CDs onto the surface of BiOBr was confirmed through structure and composition characterizations. The N-CDs/BiOBr composites exhibited superior activity for organic contaminant degradation under visible light and the 1 wt% N-CDs/BiOBr composite showed the highest degradation rate, indicating that N-CDs/BiOBr composites have great potential for application in mitigating hazardous contaminants...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28327470/synthesis-of-novel-nitrogen-doped-carbon-dots-for-highly-selective-detection-of-iron-ion
#8
Pengfei Lv, Yixin Yao, Huimin Zhou, Jin Zhang, Zengyuan Pang, Kelong Ao, Yibing Cai, Qufu Wei
Herein, we report an eco-friendly and simple fluorescent nitrogen-doped carbon quantum dot (N-CQD) biosensor which was synthesized via a hydrothermal method using erhanediamine (EDA) and citric acid (CA) as precursors. The surface functionalization of N-CQDs exhibited a bright blue emission under the excitation wavelength of 350 nm. The obtained N-CQDs were characterized by atomic force microscopy (AFM), Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy, and transmission electron microscopy...
March 22, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28326786/solvent-free-mechanosynthesis-of-composition-tunable-cesium-lead-halide-perovskite-quantum-dots
#9
Zhi-Yuan Zhu, Qi-Qi Yang, Lin-Feng Gao, Lei Zhang, An-Ye Shi, Chun-Lin Sun, Qiang Wang, Hao-Li Zhang
A facile and green mechanosynthesis strategy free of solvent and high reaction temperature was developed to fabricate highly emissive cesium lead halide perovskite (CsPbX3) quantum dots (QDs). Their composition can be adjusted conveniently simply through mechanically milling/grinding stoichiometric combinations of raw reagents, thereby introducing a broad luminescence tunability of the product with adjustable wavelength, linewidth and photoluminescence quantum yield. Desired CsPbX3 QDs "library" can thus be readily constructed in a way like assembling Lego building blocks...
March 22, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28326666/from-millimeter-to-subnanometer-vapor-solid-deposition-of-carbon-nitride-hierarchical-nanostructures-directed-by-supramolecular-assembly
#10
Jingsan Xu, Hong Wang, Chao Zhang, Xiaofei Yang, Shaowen Cao, Jiaguo Yu, Menny Shalom
Shape and nanostructure control has great potential to enable graphitic carbon nitride (C3 N4 ) structures with new properties and functionalities. In this work, a new type of hierarchically structured nanoporous C3 N4 is introduced. The C3 N4 exhibits unique, edelweiss-like morphology, with components ranging from millimeter-sized bunches to subnanometer-thick layers. A one-step vapor-solid deposition approach using supramolecular aggregates as the precursor is carried out to accomplish the growth. Supramolecular pre-association plays a crucial role in achieving this nanostructure by directing the vaporization and deposition processes...
March 22, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28326241/modeling-of-the-growth-of-gaas-algaas-core-shell-nanowires
#11
Qian Zhang, Peter W Voorhees, Stephen H Davis
Heterostructured GaAs-AlGaAs core-shell nanowires with have attracted much attention because of their significant advantages and great potential for creating high performance nanophotonics and nanoelectronics. The spontaneous formation of Al-rich stripes along certain crystallographic directions and quantum dots near the apexes of the shell are observed in AlGaAs shells. Controlling the formation of these core-shell heterostructures remains challenging. A two-dimensional model valid on the wire cross section, that accounts for capillarity in the faceted surface limit and deposition has been developed for the evolution of the shell morphology and concentration in Al x Ga1-x As alloys...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28325048/photoinduced-single-and-multiple-electron-dynamics-processes-enhanced-by-quantum-confinement-in-lead-halide-perovskite-quantum-dots
#12
Dayton Jon Vogel, Andrei Kryjevski, Talgat M Inerbaev, Dmitri S Kilin
Methyl-ammonium lead iodide perovskite (MAPbI3) is a promising material for photovoltaic devices. A modification of the MAPbI3 into confined nanostructures is expected to further increase efficiency of solar energy conversion. Photo-excited dynamic processes in a MAPbI3 quantum dot (QD) have been modeled by many-body perturbation theory and nonadiabatic dynamics. A photoexcitation is followed by either exciton cooling (EC), its radiative (RR) or non-radiative recombination (NRR), or multi-exciton generation (MEG) processes...
March 21, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28325042/enhanced-endosomal-escape-by-light-fueled-liquid-metal-transformer
#13
Yue Lu, Yiliang Lin, Zhaowei Chen, Quanyin Hu, Yang Liu, Shuangjiang Yu, Wei Gao, Michael D Dickey, Zhen Gu
Effective endosomal escape remains as the "holy grail" for endocytosis-based intracellular drug delivery. To date, most of the endosomal escape strategies rely on small molecules, cationic polymers, or pore-forming proteins, which are often limited by the systemic toxicity and lack of specificity. We describe here a light-fueled liquid-metal transformer for effective endosomal escape-facilitated cargo delivery via a chemical-mechanical process. The nanoscale transformer can be prepared by a simple approach of sonicating a low-toxicity liquid-metal...
March 22, 2017: Nano Letters
https://www.readbyqxmd.com/read/28323777/msh6-past-and-present-and-muir-torre-syndrome-connecting-the-dots
#14
Meera Mahalingam
Sebaceous neoplasms such as adenoma, sebaceoma, and carcinoma, although sporadic in their occurrence, are clinically significant because of their association with Muir-Torre syndrome (MTS). MTS is a rare autosomal dominant genodermatosis characterized by the occurrence of sebaceous neoplasms and/or keratoacanthomas and visceral malignancies. MTS is usually the result of germline mutations in the DNA mismatch repair genes MSH2 and, albeit less commonly, MLH1. Although less know, MSH6 is yet another key player...
April 2017: American Journal of Dermatopathology
https://www.readbyqxmd.com/read/28323410/zno-quantum-dots-decorated-zn2sno4-nanowire-heterojunction-photodetectors-with-drastic-performance-enhancement-and-flexible-ultraviolet-image-sensors
#15
Ludong Li, Leilei Gu, Zheng Lou, Zhiyong Fan, Guozhen Shen
Here we report fabrication of high-performance ultraviolet photodetectors based on a unique heterojunction device structure in which ZnO quantum dots were used to decorate Zn2SnO4 nanowires. Systematic investigations have shown their ultrahigh light-to-dark current ratio (up to 6.8 × 104), specific detectivity (up to 9.0×1017 Jones), photoconductive gain (up to 1.1 × 107), fast response, and excellent stability. Compared with a pristine Zn2SnO4 nanowire, a quantum dots decorated nanowire demonstrated about 10 times higher photocurrent and responsivity...
March 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28322544/graphene-oxide-quantum-dots-as-novel-nanozymes-for-alcohol-intoxication
#16
Anqi Sun, Li Mu, Xiangang Hu
Alcohol overconsumption as a worldwide issue results in alcoholic liver disease (ALD), such as steatosis, alcoholic hepatitis and cirrhosis. The treatment of ALD has been widely investigated but remains challenging. In this work, the protective effects of graphene oxide quantum dots (GOQDs) as novel nanozymes against alcohol overconsumption are discovered, and the specific mechanisms underlying these effects are elucidated via omics analysis. GOQDs dramatically alleviate the reduction of cell viability induced by ethanol and can act as nanozymes to accelerate ethanol metabolism and avoid the accumulation of toxic intermediates in cells...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28322435/genomic-changes-following-the-reversal-of-a-y-chromosome-to-an-autosome-in-drosophila-pseudoobscura
#17
Ching-Ho Chang, Amanda M Larracuente
Robertsonian translocations resulting in fusions between sex chromosomes and autosomes shape karyotype evolution by creating new sex chromosomes from autosomes. These translocations can also reverse sex chromosomes back into autosomes, which is especially intriguing given the dramatic differences between autosomes and sex chromosomes. To study the genomic events following a Y chromosome reversal, we investigated an autosome-Y translocation in Drosophila pseudoobscura. The ancestral Y chromosome fused to a small autosome (the dot chromosome) approximately 10-15 Mya...
March 21, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28322225/probing-cytoskeletal-modulation-of-passive-and-active-intracellular-dynamics-using-nanobody-functionalized-quantum-dots
#18
Eugene A Katrukha, Marina Mikhaylova, Hugo X van Brakel, Paul M van Bergen En Henegouwen, Anna Akhmanova, Casper C Hoogenraad, Lukas C Kapitein
The cytoplasm is a highly complex and heterogeneous medium that is structured by the cytoskeleton. How local transport depends on the heterogeneous organization and dynamics of F-actin and microtubules is poorly understood. Here we use a novel delivery and functionalization strategy to utilize quantum dots (QDs) as probes for active and passive intracellular transport. Rapid imaging of non-functionalized QDs reveals two populations with a 100-fold difference in diffusion constant, with the faster fraction increasing upon actin depolymerization...
March 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28321598/preparation-of-highly-biocompatible-znse-quantum-dots-using-a-new-source-of-acetyl-cysteine-as-capping-agent
#19
Ehsan Soheyli, Reza Sahraei, Gholamreza Nabiyouni
In this paper, we describe a facile method for preparation of ZnSe quantum dots (QDs) using an inexpensive and biocompatible source of acetyl cysteine in aqueous media. The structural properties of the ZnSe QDs have been characterized using XRD, FT-IR, and TEM techniques. The optical properties of the as-prepared QDs were found to be size-dependent, due to the strong confinement regime at relatively low refluxing time. Effect of solution pH and refluxing temperature on absorption and emission characteristics of the ZnSe QDs was studied...
March 20, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28321389/host-fih-mediated-asparaginyl-hydroxylation-of-translocated-legionella-pneumophila-effectors
#20
Christopher Price, Michael Merchant, Snake Jones, Ashley Best, Juanita Von Dwingelo, Matthew B Lawrenz, Nawsad Alam, Ora Schueler-Furman, Yousef A Kwaik
FIH-mediated post-translational modification through asparaginyl hydroxylation of eukaryotic proteins impacts regulation of protein-protein interaction. We have identified the FIH recognition motif in 11 Legionella pneumophila translocated effectors, YopM of Yersinia, IpaH4.5 of Shigella and an ankyrin protein of Rickettsia. Mass spectrometry analyses of the AnkB and AnkH effectors of L. pneumophila confirm their asparaginyl hydroxylation. Consistent with localization of the AnkB effector to the Legionella-containing vacuole (LCV) membrane and its modification by FIH, our data show that FIH and its two interacting proteins, Mint3 and MT1-MMP are acquired by the LCV in a Dot/Icm type IV secretion-dependent manner...
2017: Frontiers in Cellular and Infection Microbiology
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