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PubMed Journals Articles About "Vertical Bilayer Heterostructures With High Photoluminescence Quantum Yield" RSS

04:54 EDT 24th August 2019 | BioPortfolio

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Showing "Vertical Bilayer Heterostructures with High Photoluminescence Quantum Yield" PubMed Articles 1–25 of 34,000+

Biology and Significance of Alpha-Fetoprotein in Hepatocellular Carcinoma.

Hepatocellular carcinoma (HCC) is one of the most common causes of cancer-related deaths globally due, in part, to the majority of patients being diagnosed with intermediate or advanced stage disease. Our increased understanding of the heterogeneous molecular pathogenesis of HCC has led to significant developments in novel targeted therapies. Despite these advances, there remains a high unmet need for new treatment options. HCC is a complex disease with multiple pathogenic mechanisms caused by a variety of ...


Investigation of Support Effect in Atomically Dispersed Pt on WO3-x for High Utilization of Pt in Hydrogen Evolution Reaction.

Single-atom catalysts (SACs) have attracted growing attention because they maximize the number of active sites, with unpredictable catalytic activity. Despite numerous studies on SACs, there is little research on the support, which is essential to understanding SAC. Herein, we systematically investigated the influence of the support on the performance of the SAC by comparing with single-atom Pt supported on carbon (Pt SA/C) and Pt nanoparticles supported on WO 3-x (Pt NP/WO 3-x ). The results revealed that ...

A synthetic glycerol assimilation pathway demonstrates biochemical constraints of cellular metabolism.

The engineering of synthetic metabolic routes can provide valuable lessons on the roles of different biochemical constraints in shaping pathway activity. In this study, we designed and engineered a novel glycerol assimilation pathway in E. coli. While the synthetic pathway was based only on well-characterized endogenous reactions, we were not able to establish robust growth using standard concentrations of glycerol. Long-term evolution failed to improve growth via the pathway, indicating that this limitatio...


Lots of little ones: Analysis of charitable donations to a hospice and palliative care unit in Taiwan.

Charitable donations play a major role in the provision of hospice and palliative care (HPC) services, most of which are not reimbursed by health insurance programs. A good understanding of the constitution and use of donations is thus conducive to maintaining a high-quality HPC unit.

Characteristics of flavonoids as potent MERS-CoV 3C-like protease inhibitors.

Middle-East Respiratory Syndrome-Coronavirus (MERS-CoV) is a zoonotic virus transmitted between animals and human beings. It causes MERS with high mortality rate. However, no vaccine or specific treatment is currently available. Since antiviral activity of some flavonoids are known, we applied a flavonoid library to probe inhibitory compounds against MERS-CoV 3C-like protease (3CLpro). Herbacetin, isobavachalcone, quercetin 3-β-d-glucoside and helichrysetin were found to block the enzymatic activity of MER...

Effectiveness of fluoride varnish four times a year in preventing caries in the primary dentition: A 2 year randomized controlled trial.

To test the effectiveness of fluoride varnish in preventing caries in early childhood in children at high risk of caries.

CDs@ZIF-8 modified thin film polyamide nanocomposite membrane for simultaneous enhancement of chlorine-resistance and disinfection byproducts removal in drinking water.

Reverse osmosis (RO) is an emerging membrane technology for disinfection byproducts (DBPs) removal. However, the chlorine-resistance and DBPs removal performance of thin film composite (TFC) polyamide membranes should be simultaneously improved when used in chlorinated drinking water. This study was dedicated to synthesize a novel nanoparticle of ZIF-8 with carbon dots (CDs@ZIF-8) and then modify thin film nanocomposite (TFN) membranes to enhance their performance in removing four trihalomethanes (THMs), fo...

Vapor-Phase Incommensurate Heteroepitaxy of Oriented Single-Crystal CsPbBr on GaN: Towards Integrated Optoelectronic Applications.

Integrating metallic halide perovskites with established modern semiconductor technology is significant for promoting the development of application-level optoelectronic devices. To realize such devices, exploring the growth dynamics and interfacial carrier dynamics of perovskites deposited on the core materials of semiconductor technology is essential. Herein, we report the incommensurate heteroepitaxy of highly oriented single-crystal cesium lead bromide (CsPbBr) on -wurtzite GaN/sapphire substrates with ...

Auger Suppression in -Type HgSe Colloidal Quantum Dots.

Transient infrared photoluminescence upconversion is used to study the exciton dynamics in small-gap HgSe colloidal quantum dots in the 2000 - 6500 cm (0.25 - 0.80 eV) range. The intraband mid-infrared photoluminescence decays show absent or greatly reduced Auger relaxation of biexcitons, proposed as a generic feature of weakly -type quantum dots due to the sparse density of states in the conduction band. The nonradiative relaxation of the intraband carriers is instead consistent with near-field energy tran...

Isolated Iron Single Atomic Site Catalyzed Chemoselective Transfer Hydrogenation of Nitroarenes to Arylamines.

Selective hydrogenation of nitroarenes to arylamines is a great chal-lenge due to the complicated mechanism and competitive hydro-genation of reducible functional groups. Isolated single atomic site catalysts, benefitting from their uniform and well-defined catalytic sites, are promising to achieve high activity and selectivity. Herein, we prepared an isolated iron single atomic catalyst supported on ordered mesoporous nitrogen-doped carbon (Fe1/N-C). The as-prepared Fe1/N-C showed excellent activity and to...

Using Silver Nanoparticles-Embedded Silica Metafilms as Substrates to Enhance the Performance of Perovskite Photodetectors.

Plasmonic metal nanostructures provide a promising strategy for light trapping and therefore can dramatically enhance photocurrent in optoelectronics only if the trapped light can be coupled effectively from plasmons to excitons, whereas the reverse transfer of energy, charge, and heat from excitons to plasmons can be suppressed. Motivated by this, this work develops a scheme to implement a metafilm with Ag nanoparticles (NPs) embedded in 10 nm thick silica (Ag NPs-silica metafilm) to the active device chan...

A d-band electron correlated thermoelectric thermistor established in meta-stable perovskite family of rare-earth nickelates.

The d-band electron correlations shed a light on bridging multiple functionalities within one material system, and this further extends the horizon in material designs and their emerging device applications. Herein, we demonstrate the combination of thermoelectric and thermistor functionalities within the perovskite family of correlated rare-earth nickelates (ReNiO3) having small rare-earth elements (i.e., YNiO3 and DyNiO3), in addition to their already known metal to insulator transitions. In contrast to c...

Giant Alloyed Hot Injection Shells Enable Ultra-Low Optical Gain Threshold in Colloidal Quantum Wells.

As attractive materials system for high-performance optoelectronics, colloidal nanoplatelets (NPLs) benefit from atomic-level precision in thickness, minimizing emission inhomogeneous broadening. Much progress has been made to enhance their photoluminescence quantum yield (PLQY) and photostability. However, layer-by-layer growth of shells at room temperature has to date resulted in defects that limit PLQY and thus curtail the performance of NPLs as an optical gain medium. Here we introduce a hot-injection m...

Antimonite Binding to Natural Organic Matter: Spectroscopic Evidence from a Mine Water Impacted Peatland.

Peatlands and other wetlands are sinks for antimony (Sb), and solid natural organic matter (NOM) may play an important role in controlling Sb binding. However, direct evidence of Sb sequestration in natural peat samples is lacking. Here, we analyzed solid phase Sb, iron (Fe), and sulfur (S) as well as aqueous Sb speciation in three profiles up to a depth of 80 cm in a mine water impacted peatland in northern Finland. Linear combination fittings of extended X-ray absorption fine structure spectra showed that...

Solid and aqueous speciation of yttrium in passive remediation systems of acid mine drainage.

Yttrium belongs to the rare earth elements (REE) together with lanthanides and scandium. REE are commonly used in modern technologies, and their limited supply has made it necessary to look for new alternative resources. Acid mine drainage (AMD) is a potential resource since is moderately enriched in REE. In fact, in passive remediation systems, which are implemented to minimize the environmental impacts of AMD, REE are mainly retained in basaluminite, an aluminum hydroxysulfate precipitate. In this study, ...

Activating Graphyne Nanosheet via sp-Hybridized Boron Modulation for Electrochemical Nitrogen Fixation.

Exploring new metal-free catalysts with high activity for nitrogen reduction reaction (NRR) is highly desirable but remains a big challenge. Graphyne (GY) is a typical two-dimensional carbon material with many excellent properties. However, the NRR has rarely been envisaged on a GY-based metal-free catalyst up to now. Density functional theory calculations reveal that although pristine GY is inactive for N reduction, boron modulation can endow it with efficient activity toward NRR. Natural bond orbitals ana...

Environment-Controlled Postsynthetic Modifications of Iron Formate Frameworks.

New, hybrid iron-formate perovskites have been obtained in high-pressure reactions. In addition to the pressure range, the liquid environment of the sample also regulates the course of transformations. Formate α-DmaFeFeFor (Dma = (CH)NH, For = HCOO), when compressed in oil or in isopropanol at 1.40 GPa, transforms to a new phase γ, different than that obtained at low-temperature (phase β). In glycerol, phase α can be compressed to 1.40 GPa, but then it reacts to DmaFeFor, with all Fe(III) cations reduce...

Reduced-Order Dispatch Model for Simulating Marginal Emissions Factors for the United States Power Sector.

This study develops a reduced-order power plant dispatch model and uses it to simulate marginal emissions factors (MEFs) for the 2014-2017 United States (U.S.) electric grid at the North American Electric Reliability Corporation (NERC) regional level. MEFs help quantify the health, environmental, and climate change impacts caused by changes in marginal net electricity consumption, which could result, for example, from new technologies or policies. This study develops the model, validates it against historic...

AIE-Active Functionalized Acrylonitriles: Structure Tuning by Simple Reaction-Condition Variation, Efficient Red Emission and Two-Photon Bioimaging.

Acrylonitriles with aggregation-induced emission (AIE) characteristics have found to show promising applications in two-photon biomedical imaging. Generally, elaborate synthetic efforts are required to achieve different acrylonitriles with dis-tinct functionalities. In this work, we first reported the synthesis of two different group-functionalized AIE-active acrylo-nitriles (TPAT-AN-XF and 2TPAT-AN) obtained simply by mixing the same reactants at different temperature using a facile and transition metal-fr...

Boosting Fenton-Like Reactions via Single Atom Fe Catalysis.

Maximizing the numbers of exposed active sites in supported metal catalysts is important for achieving high reaction activity. In this work, a simple strategy for anchoring single atom Fe on SBA-15 to expose utmost Fe active sites was proposed. Iron salts were introduced into the as-made SBA-15 containing the template and calcined for simultaneous decomposition of the iron precursor and the template, resulting in single atom Fe sites in the nanopores of SBA-15 catalysts (SAFe-SBA). X-ray diffraction (XRD), ...

Chemoselective Chan-Lam Coupling Reactions between Benzimidazoline-2-Thiones and Arylboronic Acids.

An efficient Chan-Lam-type methodology for the selective synthesis of S-arylbenzimidazoles and N,S-diarylbenzimidazoles was developed. The selectivity was controlled by varying the amount of the catalyst Cu(OAc)2•H2O, temperature and solvent switching. These transformations feature a simple protocol, broad functional group tolerance, high selectivity, and good to excellent yields. It is noteworthy that these reactions represent the first examples of the application of the selective Chan-Lam coupling.

Structural and Stability Trends of the Complexation of Hexavalent Actinides with Two Dipicolinic Acid Derivatives: An Experimental and Theoretical Study.

Revealing the complexation behavior of high-valent actinides in solutions is of great importance to better understand the fundamental chemistry of actinides as well as to control the separation property of actinides in nuclear fuel cycles. In this work, the complexation of hexavalent actinide cations U(VI), Np(VI), and Pu(VI) with two dipicolinic acid derivatives, 6-(dimethylcarbamoyl)picolinic acid (DMAPA, denoted as HL) and -tetramethylpyridine-2,6-dicarboxamide (TMPDA), in aqueous solutions were investig...

Chemical Synthesis of Atomically Tailored SUMO E2 Conjugating Enzymes for the Formation of Covalently Linked SUMO-E2-E3 Ligase Ternary Complexes.

E2 conjugating enzymes are the key catalytic actors in the transfer of ubiquitin, SUMO, and other ubiquitin-like modifiers to their substrate proteins. Their high rates of transfer and promiscuous binding complicate studies of their interactions and binding partners. In order to access specific, covalently-linked conjugates of the SUMO E2 conjugating enzyme Ubc9, we prepared synthetic variants bearing site-specific non-native modifications including: 1) replacement of Cys93 to 2,3-diaminopropionic acid to f...

QresFEP: an automated protocol for the free energy calculation of protein mutations in Q.

Predicting the effect of single-point mutations on protein stability or protein-ligand binding is a major challenge in computational biology. Free energy calculations constitute the most rigorous approach to this problem, though the estimation of converged values for amino acid mutations is still challenging. To overcome this limitation, we developed tailored protocols to calculate free energy shifts associated to single point mutations. We herein describe QresFEP, which includes an extension of our early p...

Improving amorphous carbon anodes for Na ion batteries by surface treatment of presodiated electrode with Al2O3.

Disordered carbons are promising anode materials for sodium ion batteries. However, a major drawback of these materials is their low Coulombic efficiency in the first cycles, which indicates parasitic reactions. Such reactions can be supressed by alumina coating on the surface of the anodic materials; more ions are then available for electrochemical activity, and less electrolyte solution is lost. On the other hand, some pores and surface edge sites are passivated by the coating and are no longer available ...


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