3,811 results match your criteria long-range transport

Long-range magnetic order in hydroxide-layer-doped (Li Fe Mn OD)FeSe.

Phys Rev Mater 2020 Mar;4(3)

Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.

The (Li Fe OH)FeSe superconductor has been suspected of exhibiting long-range magnetic ordering due to Fe substitution in the LiOH layer. However, no direct observation such as magnetic reflection from neutron diffraction has been reported. Here, we use a chemical design strategy to manipulate the doping level of transition metals in the LiOH layer to tune the magnetic properties of the (Li Fe Mn OD)FeSe system. Read More

View Article and Full-Text PDF

Bio-Derived Hierarchical Multicore-Shell FeN-Nanoparticle-Impregnated N-Doped Carbon Nanofiber Bundles: A Host Material for Lithium-/Potassium-Ion Storage.

Nanomicro Lett 2019 Jul 15;11(1):56. Epub 2019 Jul 15.

Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, NSW, 2500, Australia.

Despite the significant progress in the fabrication of advanced electrode materials, complex control strategies and tedious processing are often involved for most targeted materials to tailor their compositions, morphologies, and chemistries. Inspired by the unique geometric structures of natural biomacromolecules together with their high affinities for metal species, we propose the use of skin collagen fibers for the template crafting of a novel multicore-shell FeN-carbon framework anode configuration, composed of hierarchical N-doped carbon nanofiber bundles firmly embedded with FeN nanoparticles ([email protected]). In the resultant heterostructure, the FeN nanoparticles firmly confined inside the carbon shells are spatially isolated but electronically well connected by the long-range carbon nanofiber framework. Read More

View Article and Full-Text PDF

Himalaya Air Quality Impacts From the COVID-19 Lockdown Across the Indo-Gangetic Plain.

Geohealth 2021 Jun 1;5(6):e2020GH000351. Epub 2021 Jun 1.

Department of Surgery University of Toronto Toronto ON Canada.

Starting in January 2020, the novel coronavirus, now known as acute respiratory syndrome coronavirus (SARS-CoV-2) and the disease that it causes (COVID-19) has had significant impacts on human health, the environment, and the economy globally. The rapid lockdown that occurred as well as its well documented timing allows for an unprecedented opportunity to examine the impact of air pollution from densely populated regions has on adjacent and pristine environments. Here, we use in situ and satellite observations to show that there was a step function decrease in two key indicators of air quality, nitrogen dioxide and airborne particulates, in locations within the Indo-Gangetic Plan (IGP) as a result of the Spring 2020 lockdown. Read More

View Article and Full-Text PDF

Acylhydrazone Sub-Units as a Proton Cargo Delivery System in 7-Hydroxyquinoline.

Chemistry 2021 Jun 16. Epub 2021 Jun 16.

Tokyo University of Pharmacy and Life Science: Tokyo Yakka Daigaku, Department of Medicinal Chemistry, JAPAN.

The reimagined concept of long-range tautomeric proton transfer using crane sub-units has been presented by designing and synthesising two new acylhydrazones containing 7-hydroxyquinoline (7-OHQ) platform. The acylhydrazone sub-units attached to the 7-OHQ at 8th position act as a crane arm for proton cargo delivery to the quinoline nitrogen. Light-induced tautomerization to their keto tautomers leads to Z/E isomerization of the C=C axle bond, followed by proton delivery to the quinoline nitrogen by covalent or hydrogen bond formation. Read More

View Article and Full-Text PDF

Insights into sources and occurrence of oxy- and nitro-PAHs in the alberta oil sands region using a network of passive air samplers.

Environ Pollut 2021 Jun 6;286:117513. Epub 2021 Jun 6.

Air Quality Processes Research Section, Environment and Climate Change Canada, Toronto, Ontario, M3H 5T4, Canada.

Mining-related activities in the Alberta Oil Sands Region (AOSR) are known to emit polycyclic aromatic hydrocarbons (PAHs) and related compounds to ambient air. This is a concern due to the toxicity of PAHs, including their transformation products such as nitrated (NPAHs) and oxygenated (OPAHs) PAHs. This is the first study that provided a more extensive outlook into the sources, occurrence in air, and spatial and seasonal patterns of NPAHs and OPAHs in the AOSR by using passive air sampling. Read More

View Article and Full-Text PDF

Ballistic Hall Photovoltammetry of Magnetic Resonance in Individual Nanomagnets.

Phys Rev Lett 2021 May;126(20):207701

Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.

We report on ballistic Hall photovoltammetry as a contactless probe of localized spin excitations. Spins resonating in the near field of a two-dimensional electron system are shown to induce a long range electromotive force that we calculate. We use this coupling mechanism to detect the spin wave eigenmodes of a single ferromagnet of sub-100 nm size. Read More

View Article and Full-Text PDF

A Case Study of Long-Range Rotary Wing Critical Care Transport in the Battlefield Environment.

J Spec Oper Med 2021 ;21(2):77-79

Military medical evacuation continues to grow both in distance and transport times. With the need for long-range transport of greater than 2 hours, crews are having to manage critical care patients for longer trips. This case study evaluates one specific event in which long-range transport of a sick noncombat patient required an enroute critical care team. Read More

View Article and Full-Text PDF

Hierarchical self-assemblies of carnosine asymmetrically functioned perylene diimide with high optoelectronic response.

J Colloid Interface Sci 2021 Jun 1;601:746-757. Epub 2021 Jun 1.

School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, China. Electronic address:

Hypothesis: Taking advantage of photoinduced electron transfer, one dimensional organic nanomaterials with tunable donor-acceptor (D-A) interface provide a promising avenue to get high optoelectric properties. However, strong charge transfer interaction between D and A segments impedes the formation of long-range ordered structure, which limits the charge transport through efficient π electronic delocalization. Incorporation of chiral peptide offering various hydrogen bonding (H-bonding) along with asymmetric molecular structure enables substantially controllable D-A interface and tunable organization of the π-conjugates. Read More

View Article and Full-Text PDF

Oxalate Decarboxylase uses Electron Hole Hopping for Catalysis.

J Biol Chem 2021 Jun 4:100857. Epub 2021 Jun 4.

Department of Chemistry, University of Florida, Box 117200, Gainesville, FL 32611, USA. Electronic address:

The hexameric low-pH stress response enzyme oxalate decarboxylase catalyzes the decarboxylation of the oxalate mono-anion in the soil bacterium Bacillus subtilis. A single protein subunit contains two Mn-binding cupin domains, and catalysis depends on Mn(III) at the N-terminal site. The present study suggests a mechanistic function for the C-terminal Mn as an electron hole donor for the N-terminal Mn. Read More

View Article and Full-Text PDF

Saharan dust and giant quartz particle transport towards Iceland.

Sci Rep 2021 Jun 4;11(1):11891. Epub 2021 Jun 4.

Soil Conservation Service of Iceland, Hella, Iceland.

Mineral dust emissions from Saharan sources have an impact on the atmospheric environment and sedimentary units in distant regions. Here, we present the first systematic observations of long-range Saharan dust transport towards Iceland. Fifteen Saharan dust episodes were identified to have occurred between 2008 and 2020 based on aerosol optical depth data, backward trajectories and numerical models. Read More

View Article and Full-Text PDF

On the impact of the COVID-19 pandemic on air quality in Florida.

Environ Pollut 2021 May 22;285:117451. Epub 2021 May 22.

Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, MD, 21205, USA.

Since early 2020, the world has faced an unprecedented pandemic caused by the novel COVID-19 virus. In this study, we characterize the impact of the lockdown associated with the pandemic on air quality in six major cities across the state of Florida, namely: Jacksonville, Tallahassee, Gainesville, Orlando, Tampa, and Miami. Hourly measurements of PM, ozone, NO, SO, and CO were provided by the US EPA at thirty sites operated by the Florida Department of Environmental Protection during mid-February to mid-April from 2015 through 2020. Read More

View Article and Full-Text PDF

Endocytosis in the context-dependent regulation of individual and collective cell properties.

Nat Rev Mol Cell Biol 2021 Jun 1. Epub 2021 Jun 1.

IEO, European Institute of Oncology IRCCS, Milan, Italy.

Endocytosis allows cells to transport particles and molecules across the plasma membrane. In addition, it is involved in the termination of signalling through receptor downmodulation and degradation. This traditional outlook has been substantially modified in recent years by discoveries that endocytosis and subsequent trafficking routes have a profound impact on the positive regulation and propagation of signals, being key for the spatiotemporal regulation of signal transmission in cells. Read More

View Article and Full-Text PDF

Atomic Force Microscopy Study of Non-DLVO Interactions between Drops and Bubbles.

Langmuir 2021 Jun 27;37(22):6830-6837. Epub 2021 May 27.

Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, State Key Laboratory of Natural Gas Hydrates, MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing, No. 18 Fuxue Road, Changping District, 102249 Beijing, P. R. China.

The heterointeraction between liquid drops and air bubbles dispersed in another immiscible liquid is studied with the application of the atomic force microscopy (AFM) probe techniques. The tetradecane drops and air bubbles readily coalescence to form a lens-like structure in 100 mM sodium chloride aqueous solution, demonstrating strong hydrophobic (HB) attraction. The interaction range and strength of this hydrophobic attraction between oil drops and air bubbles is investigated by fine control of electrical double layer thicknesses related to specific electrolyte concentrations, and a midrange term in combination with a short-range term is found to present a proper characterization of this hydrophobic attraction. Read More

View Article and Full-Text PDF

Memory in Ion Channel Kinetics.

Acta Biotheor 2021 May 27. Epub 2021 May 27.

Department of Animal Morphology and Physiology, Federal Rural University of Pernambuco, Recife, Pernambuco, Brazil.

Ion channels are transport proteins present in the lipid bilayers of biological membranes. They are involved in many physiological processes, such as the generation of nerve impulses, hormonal secretion, and heartbeat. Conformational changes in the ion channel-forming protein allow the opening or closing of pores to control the ionic flux through the cell membranes. Read More

View Article and Full-Text PDF

Long-range nontopological edge currents in charge-neutral graphene.

Nature 2021 May 26;593(7860):528-534. Epub 2021 May 26.

Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel.

Van der Waals heterostructures display numerous unique electronic properties. Nonlocal measurements, wherein a voltage is measured at contacts placed far away from the expected classical flow of charge carriers, have been widely used in the search for novel transport mechanisms, including dissipationless spin and valley transport, topological charge-neutral currents, hydrodynamic flows and helical edge modes. Monolayer, bilayer and few-layer graphene, transition-metal dichalcogenides and moiré superlattices have been found to display pronounced nonlocal effects. Read More

View Article and Full-Text PDF

Perovskite-type superlattices from lead halide perovskite nanocubes.

Nature 2021 May 26;593(7860):535-542. Epub 2021 May 26.

Department of Chemistry and Applied Biosciences, Institute of Inorganic Chemistry, ETH Zürich, Zürich, Switzerland.

Atomically defined assemblies of dye molecules (such as H and J aggregates) have been of interest for more than 80 years because of the emergence of collective phenomena in their optical spectra, their coherent long-range energy transport, their conceptual similarity to natural light-harvesting complexes, and their potential use as light sources and in photovoltaics. Another way of creating versatile and controlled aggregates that exhibit collective phenomena involves the organization of colloidal semiconductor nanocrystals into long-range-ordered superlattices. Caesium lead halide perovskite nanocrystals are promising building blocks for such superlattices, owing to the high oscillator strength of bright triplet excitons, slow dephasing (coherence times of up to 80 picoseconds) and minimal inhomogeneous broadening of emission lines. Read More

View Article and Full-Text PDF

[Spatio-temporal Patterns and Potential Sources of Absorbing Aerosols in the Fenwei Plain].

Huan Jing Ke Xue 2021 Jun;42(6):2634-2647

College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China.

Air quality has gradually improved in many parts of China; however, air pollution is become more severe in the Fenwei Plain. Using OMI/Aura OMAERUV L2 and PM data, spatial autocorrelation analysis and back trajectory modeling were used to explore the spatio-temporal patterns of absorptive aerosols over the Fenwei Plain, and the dominant types, transmission paths, and potential source areas were identified. The main results can be summarized as follows:① Annual mean absorbing aerosol index (AAI) values increased between 2005 and 2019, with high period occurring in 2006, 2013, and 2017, with values exceeding 0. Read More

View Article and Full-Text PDF

Source attribution of air pollution using a generalized additive model and particle trajectory clusters.

Sci Total Environ 2021 Aug 23;780:146458. Epub 2021 Mar 23.

University of Wisconsin - Madison, Environmental Chemistry and Technology Program, Madison, WI, USA; Wisconsin State Laboratory of Hygiene, Madison, WI, USA.

Speciated hourly measurements of fine aerosols were made for more than two years at an urban, an industrial and a port site in Busan, Korea. A Generalized Additive Model (GAM) was designed to deconvolve factors contributing to the pollutant concentrations at multiple scales. The model yields estimates of source contributions to pollution by separately identifying the signals in the time series due to meteorology, vertical mixing, horizontal wind transport and temporal variations such as diurnal, weekly, seasonal and annual trends. Read More

View Article and Full-Text PDF

Development of a universal conductive platform for anchoring photo- and electroactive proteins using organometallic terpyridine molecular wires.

Nanoscale 2021 Jun;13(21):9773-9787

Solar Fuels Laboratory, Centre of New Technologies, University of Warsaw, Banacha 2C, 02-097 Warsaw, Poland.

The construction of an efficient conductive interface between electrodes and electroactive proteins is a major challenge in the biosensor and bioelectrochemistry fields to achieve the desired nanodevice performance. Concomitantly, metallo-organic terpyridine wires have been extensively studied for their great ability to mediate electron transfer over a long-range distance. In this study, we report a novel stepwise bottom-up approach for assembling bioelectrodes based on a genetically modified model electroactive protein, cytochrome c553 (cyt c553) and an organometallic terpyridine (TPY) molecular wire self-assembled monolayer (SAM). Read More

View Article and Full-Text PDF

CAMSAPs organize an acentrosomal microtubule network from basal varicosities in radial glial cells.

J Cell Biol 2021 Aug 21;220(8). Epub 2021 May 21.

Institut Curie, Paris Sciences et Lettres Research University, Centre national de la recherche scientifique UMR144, Paris, France.

Neurons of the neocortex are generated by stem cells called radial glial cells. These polarized cells extend a short apical process toward the ventricular surface and a long basal fiber that acts as a scaffold for neuronal migration. How the microtubule cytoskeleton is organized in these cells to support long-range transport is unknown. Read More

View Article and Full-Text PDF

Rapid In Situ Ligand-Exchange Process Used to Prepare 3D PbSe Nanocrystal Superlattice Infrared Photodetectors.

Small 2021 May 21:e2101166. Epub 2021 May 21.

Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA, 94550, USA.

Colloidal semiconductor nanocrystals are important building blocks for low-cost, solution-processed electronic devices with tunable functionalities. Considerable progress is made in improving charge transport through nanocrystal films by exchanging long insulating ligands with shorter passivating ligands. To take full advantage of this strategy, it is equally important to fabricate close-packed structures that reduce the average interparticle spacing. Read More

View Article and Full-Text PDF

Electrical Loss Management by Molecularly Manipulating Dopant-free Poly(3-hexylthiophene) towards 16.93 % CsPbI Br Solar Cells.

Angew Chem Int Ed Engl 2021 May 20. Epub 2021 May 20.

Department of Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

Inorganic cesium lead halide perovskites offer a pathway towards thermally stable photovoltaics. However, moisture-induced phase degradation restricts the application of hole transport layers (HTLs) with hygroscopic dopants. Dopant-free HTLs fail to realize efficient photovoltaics due to severe electrical loss. Read More

View Article and Full-Text PDF

Local protein synthesis of neuronal MT1-MMP for agrin-induced presynaptic development.

Development 2021 May 20;148(10). Epub 2021 May 20.

School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong.

Upon the stimulation of extracellular cues, a significant number of proteins are synthesized distally along the axon. Although local protein synthesis is crucial for various stages throughout neuronal development, its involvement in presynaptic differentiation at developing neuromuscular junctions remains unknown. By using axon severing and microfluidic chamber assays, we first showed that treatment of a protein synthesis inhibitor, cycloheximide, inhibits agrin-induced presynaptic differentiation in cultured Xenopus spinal neurons. Read More

View Article and Full-Text PDF

Dynamics of Emim in [Emim][TFSI]/LiTFSI Solutions as Bulk and under Confinement in a Quasi-liquid Solid Electrolyte.

J Phys Chem B 2021 May 18;125(20):5443-5450. Epub 2021 May 18.

Neutron Scattering Division, Oak Ridge National Laboratory, P.O. Box 2008 MS6455, Oak Ridge, Tennessee 37831, United States.

Quasi-liquid solid electrolytes are a promising alternative for next-generation Li batteries. These systems combine the safety of solid electrolytes with the desired properties of liquids and are typically formed by solutions of Li salts in ionic liquids incorporated into solid matrices. Here, we present a fundamental understanding of the transport properties in solutions of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim][TFSI]), either in bulk form or incorporated in a boron nitride (BN) matrix. Read More

View Article and Full-Text PDF

Polychlorinated Diphenyl Sulfides: An Emerging Class of Persistent, Bioaccumulative and Toxic Substances (PBTs) in the Environment.

Environ Toxicol Chem 2021 May 18. Epub 2021 May 18.

State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.

Recently, polychlorinated diphenyl sulfides (PCDPSs) have attracted increasing attention due to their potential adverse effects on human and ecosystem health. Herein, we present a review regarding their environmental occurrence, persistence, bioaccumulation, toxicity and biotransformation. The existing literature demonstrated that PCDPSs are ubiquitous in various environmental matrices, persistent in the environment and have long-range transport potential. Read More

View Article and Full-Text PDF

The effects of vacancies and their mobility on the dynamic heterogeneity in 1,3-dimethylimidazolium hexafluorophosphate organic ionic plastic crystals.

Phys Chem Chem Phys 2021 May;23(20):11980-11989

Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea.

Organic ionic plastic crystals (OIPCs) are the crystals of electrolytes with a long-range translational order. The rotational modes of ions in OIPCs are, however, activated even in solid phases such that the diffusion of dopants such as lithium ions may be facilitated. OIPCs have been, therefore, considered as good candidates for solid electrolytes. Read More

View Article and Full-Text PDF

The Steady March toward Biomimetic Nanoelectronics.

ACS Nano 2021 05 17;15(5):7844-7847. Epub 2021 May 17.

Energy Geosciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States.

Steady progress is being made in unveiling nature's long-range charge transport mechanisms in redox proteins and in the development of versatile self-assembling scaffolds and proteins by design-two separate fields that soon may intersect to yield the first artificial bioelectronic wires. Here, we summarize compelling developments in these areas that put a spotlight on the prospect of their convergence, featuring, in particular, work by Dai in this issue of that illustrates success in intentional design with nuanced control, binding multiple c-type hemes into a specific ordered array bearing the essential hallmarks of heme chains in bacterial multiheme cytochromes. Read More

View Article and Full-Text PDF

Geometry dependence of excitonic couplings and the consequences for configuration-space sampling.

J Comput Chem 2021 Jul 16;42(20):1402-1418. Epub 2021 May 16.

Institute of Physical Chemistry, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany.

Excitonic coupling plays a key role for the understanding of excitonic energy transport (EET) in, for example, organic photovoltaics. However, the calculation of realistic systems is often beyond the applicability range of accurate wavefunction methods so that lower-scaling semi-empirical methods are used to model EET events. In the present work, the distance and angle dependence of excitonic couplings of dimers of selected organic molecules are evaluated for the semi-empirical long-range corrected density functional based tight binding (LC-DFTB) method and spin opposite scaled second order approximate coupled cluster singles and doubles (SOS-CC2). Read More

View Article and Full-Text PDF

Source identification of atmospheric particle-bound mercury in the Himalayan foothills through non-isotopic and isotope analyses.

Environ Pollut 2021 May 6;286:117317. Epub 2021 May 6.

State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences (CAS), Lanzhou, 730000, China.

This study reports on the sources of atmospheric particle-bound mercury (HgP) in less studied regions of Nepal based on the analysis of stable mercury (Hg) isotopes in aerosol samples from two neighboring areas with high and low anthropogenic emissions (Kathmandu and Dhulikhel, respectively) during 2018. Although the Indian monsoon and westerlies are generally regarded as the primary carriers of pollutants to this region via the heavily industrialized Indo-Gangetic Plain, the concentrations of total suspended particles (TSP) and HgP in Kathmandu were higher than those in Dhulikhel, thus suggesting a substantial contribution from local sources. Both isotopic (δHg and ΔHg) and non-isotopic evidence indicated that dust, waste burning, and industrial byproducts (without Hg amalgamation) were the major sources of Hg in Kathmandu during the study period. Read More

View Article and Full-Text PDF

Distribution and Emission Estimation of Short- and Medium-Chain Chlorinated Paraffins in Chinese Products through Detection-Based Mass Balancing.

Environ Sci Technol 2021 Jun 14;55(11):7335-7343. Epub 2021 May 14.

State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.

Short- and medium-chain chlorinated paraffins (SCCPs and MCCPs, respectively) have raised environmental concern due to their potential for persistence, long-range transport, bioaccumulation, and toxicity. However, little is known about the production, use, and environmental emissions of SCCPs and MCCPs in China, the world's largest producer and consumer. In this study, we estimated the amounts of SCCPs and MCCPs produced and used in China in 2018-2019 based on a nationwide survey and measurements of concentrations in products, from which we estimated the environmental emissions of SCCPs and MCCPs in China. Read More

View Article and Full-Text PDF