481,923 results match your criteria Carbon Management [Journal]


Reactive cholangiocytes differentiate into proliferative hepatocytes with efficient DNA repair in mice with chronic liver injury.

J Hepatol 2019 Feb 19. Epub 2019 Feb 19.

Laboratory of Hepato-gastroenterology, Institut de Recherche Expérimentale et Clinique, Université catholique de Louvain, Brussels, Belgium. Electronic address:

Background And Aim: Chronic liver diseases are characterized by expansion of the small immature cholangiocytes - a mechanism named ductular reaction (DR) - which have the capacity to differentiate in hepatocytes. We investigated the kinetics of DR differentiation into hepatocytes as well as several important features as functional maturity, clonal expansion and resistant to stress of the newly formed hepatocytes in mice with long-term liver damage.

Methods: We tracked cholangiocytes using osteopontin-iCreER and hepatocytes with AAV8-TBG-Cre. Read More

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http://dx.doi.org/10.1016/j.jhep.2019.02.003DOI Listing
February 2019

Maximizing ether oxygen content in polymers for membrane CO2 removal from natural gas.

ACS Appl Mater Interfaces 2019 Feb 22. Epub 2019 Feb 22.

Membrane materials for CO2 removal from natural gas are based on glassy polymers with high CO2/CH4 diffusivity selectivity. However, these polymers suffer from competitive sorption by heavy hydrocarbons that decreases CO2 permeability, and physical aging that reduces gas permeability with time. We circumvent these issues by designing rubbery, solubility-selective polymers with a ratio of ether/ester oxygen to carbon as high as 0. Read More

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http://dx.doi.org/10.1021/acsami.9b01079DOI Listing
February 2019

Laser-Induced Graphene-PVA Composite as Robust Electrically Conductive Water Treatment Membranes.

ACS Appl Mater Interfaces 2019 Feb 22. Epub 2019 Feb 22.

Graphene nanomaterials can feature both a superb electrical conductivity and unique physical properties such as an extreme surface wettability, which is potentially applicable for many purposes including water treatment. Laser-induced graphene (LIG) is an electrically conductive three-dimensional porous carbon material prepared by direct laser writing on various polymers in ambient conditions with a CO2 laser. Low fouling LIG coatings in water technology have been reported, however, the mechanical strength and the separation properties of LIG coated membranes are limited. Read More

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http://dx.doi.org/10.1021/acsami.9b00510DOI Listing
February 2019

Electronic control of H+ current in a bioprotonic device with carbon nanotube porins.

PLoS One 2019 22;14(2):e0212197. Epub 2019 Feb 22.

Department of Electrical and Computer Engineering, University of California Santa Cruz, Santa Cruz, CA, United States of America.

Hybrid biotic abiotic devices can be used to interface electronics with biological systems for novel therapies or to increase device functionality beyond silicon. Many strategies exist to merge the electronic and biological worlds, one dominated by electrons and holes as charge carriers, the other by ions. In the biological world, lipid bilayers and ion channels are essential to compartmentalize the cell machinery and regulate ionic fluxes across the cell membrane. Read More

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0212197PLOS
February 2019

Synthesis of CH-Linked α(1,6)-Disaccharide Analogues by α-Selective Radical Coupling C-Glycosylation.

Org Lett 2019 Feb 22. Epub 2019 Feb 22.

Graduate School of Pharmaceutical Sciences , Kyushu University , 3-1-1 Maidashi , Higashi-ku, Fukuoka 812-8582 , Japan.

C-Linked carbohydrate structure, in which the cleavable O-glycosidic linkage is replaced by a carbon unit, is a useful tool for functional analyses of glycoconjugates. We describe a synthetic method for α-CH-linked disaccharide structures, such as Glc(1,6)-Glc, by stereoselective radical-coupling C-glycosylation between a conformationally constrained and stable C1-sp hybridized xanthate donor and a carefully designed acceptor. Read More

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http://dx.doi.org/10.1021/acs.orglett.9b00133DOI Listing
February 2019

Chemical Dynamics Simulation of Energy Transfer: Propylbenzene Cation and N Collisions.

J Phys Chem A 2019 Feb 22. Epub 2019 Feb 22.

Collisional energy transfer of highly vibrationally excited propylbenzene cation in a N bath has been studied with chemical dynamics simulations. In this work, an intermolecular potential of propylbenzene cation interacting with N was developed from SCS-MP2/6-311++G** ab initio calculations. Using a particle swarm optimization(PSO) algorithm, the ab initio results were simultaneously fit to a sum of three two-body potential, consisting of C-N, C-N and H-N, where C is carbon on benzene ring and C is carbon on the propyl side chain. Read More

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http://dx.doi.org/10.1021/acs.jpca.9b00111DOI Listing
February 2019

Carcinogenic Metabolic Activation Process of Naphthalene by the Cytochrome P450 Enzyme 1B1: A Computational Study.

Chem Res Toxicol 2019 Feb 22. Epub 2019 Feb 22.

The metabolic activation and transformation of naphthalene by cytochrome P450 enzyme (CYP 1B1) plays an important role in its potential carcinogenicity. The process has been explored by a quantum mechanics/molecular mechanics (QM/MM) computational method. Molecular dynamic simulations were performed to explore the interaction between naphthalene and CYP 1B1. Read More

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http://dx.doi.org/10.1021/acs.chemrestox.8b00297DOI Listing
February 2019

Catalyzed Gasoline Particulate Filters Reduce Secondary Organic Aerosol Production from Gasoline Direct Injection Vehicles.

Environ Sci Technol 2019 Feb 22. Epub 2019 Feb 22.

The effects of photochemical aging on exhaust emissions from two light-duty vehicles with gasoline direct injection (GDI) engines equipped with and without catalyzed gasoline particle filters (GPFs) were investigated using a mobile environmental chamber. Both vehicles with and without the GPFs were exercised over the LA92 drive cycle using a chassis dynamometer. Diluted exhaust emissions from the entire LA92 cycle were introduced to the mobile chamber and subsequently photochemically reacted. Read More

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http://dx.doi.org/10.1021/acs.est.8b06418DOI Listing
February 2019

Regioselective Hydrogenation of a 60-Carbon Nanographene Molecule towards a Circumbiphenyl Core.

J Am Chem Soc 2019 Feb 22. Epub 2019 Feb 22.

Regioselective peripheral hydrogenation of a nanographene molecule with 60 contiguous sp2 carbons provides unprec-edented access to peralkylated circumbiphenyl (1). Conver-sion to the circumbiphenyl core structure was unambigu-ously validated by MALDI-TOF mass spectrometry, NMR, FTIR, and Raman spectroscopy. UV-vis absorption spectra and DFT calculations demonstrated the significant change of the optoelectronic properties upon peripheral hydro-genation. Read More

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http://dx.doi.org/10.1021/jacs.9b00384DOI Listing
February 2019

Production of biodiesel by autotrophic Chlorella pyrenoidosa in a sintered disc lab scale bubble column photobioreactor under natural sunlight.

Prep Biochem Biotechnol 2019 Feb 22:1-15. Epub 2019 Feb 22.

a Department of Biosciences and Bioengineering , Indian Institute of Technology Guwahati , Guwahati , India.

The main focus of the work is to study Chlorella pyrenoidosa mediated photoautotrophic production of lipid in a bubble column photobioreactor using CO as carbon source under natural diurnal outdoor sunlight. The limiting and inhibiting concentrations of CO in sparging gas, nitrogen inhibition, reversibility of the CO inhibition on growth, and lipid production have been investigated under natural sunlight. A process model coupled with light distribution inside the culture has been developed considering different concentration of dissolved CO and urea, repression of nitrogen on lipid production under natural sunlight diurnal in nature in a bubble column reactor. Read More

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http://dx.doi.org/10.1080/10826068.2018.1536991DOI Listing
February 2019

Stable isotopes of H, C and N in mice bone collagen as a reflection of isotopically controlled food and water intake.

Isotopes Environ Health Stud 2019 Feb 22:1-21. Epub 2019 Feb 22.

c School of Optometry , Indiana University , Bloomington , IN , USA.

H/H ratios in animal biomass reflect isotopic input from food and water. A 10-week controlled laboratory study raised 48 mice divided in two generations (8 mothers Mus musculus and their offspring). The mice were divided into four groups based on the combination of H, C, N-enriched and non-enriched food and water. Read More

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http://dx.doi.org/10.1080/10256016.2019.1580279DOI Listing
February 2019

Synthetic Studies on Enantioselective Total Synthesis of Cyathane Diterpenoids: Cyrneines A and B, Glaucopine C, and (+)-Allocyathin B2.

J Org Chem 2019 Feb 22. Epub 2019 Feb 22.

The details for the synthetic studies on enantioselective total synthesis of cyathane diterpenoids cyrneine A (1) and B (2), glaucopine C (3), and (+)-allocyathin B2 are presented. We established a mild Suzuki coupling for heavily substituted nonactivated cyclopentenyl triflates using a phosphinamide-derived palladacycle as precatalyst and a chelation-controlled highly regioselective Friedel-Crafts cyclization. The utilization of these two key reactions enabled a rapid construction of the 5-6-6-tricyclic skeleton. Read More

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http://dx.doi.org/10.1021/acs.joc.8b03138DOI Listing
February 2019

An sp2 Patterned Boron Doped Diamond Electrode for the Simultaneous Detection of Dissolved Oxygen and pH.

ACS Sens 2019 Feb 22. Epub 2019 Feb 22.

A hybrid sp2-sp3 electrochemical sensor comprising patterned regions of non-diamond-carbon (sp2) in a boron doped diamond (sp3) matrix is described for the simultaneous voltammetric detection of dissolved oxygen (DO) and pH in buffered aqueous solutions. Using a laser micropatterning process it is possible to write mechanically robust regions of sp2 carbon into a BDD electrode. These regions both promote the electrocatalytic reduction of oxygen and facilitate the proton coupled electron transfer of quinone groups, integrated into the surface of the sp2 carbon. Read More

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http://dx.doi.org/10.1021/acssensors.9b00137DOI Listing
February 2019

Catalytic Converters for Water Treatment.

Acc Chem Res 2019 Feb 22. Epub 2019 Feb 22.

Nanotechnology Enabled Water Treatment (NEWT) Center , 6100 Main Street , Houston , Texas 77005 , United States.

Fresh water demand is driven by human consumption, agricultural irrigation, and industrial usage and continues to increase along with the global population. Improved methods to inexpensively and sustainably clean water unfit for human consumption are desired, particularly at remote or rural locations. Heterogeneous catalysts offer the opportunity to directly convert toxic molecules in water to nontoxic products. Read More

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http://dx.doi.org/10.1021/acs.accounts.8b00642DOI Listing
February 2019

Co2P@N,P-codoped Carbon Nanofiber as Free-standing Air-electrode for Zn-air Batteries: Synergy Effects of CoNx Satellites shells.

ACS Appl Mater Interfaces 2019 Feb 22. Epub 2019 Feb 22.

Here first a free-standing electrode composed of cobalt phosphides (Co2P) supported by cobalt nitrides moieties (CoNx) and N, P-codoped porous carbon nanofiber (CNF) in one-step electrospinning of environmentally friendly benign phosphorous precursors is reported. Physiochemical characterization revealed the symbiotic relationship between Co2P crystal and surrounding nanometer size CoNx moieties embedded in N, P-codoped porous carbon matrix. The Co2P@CNF shows high oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performance owing to the synergistic effect of Co2P nanocrystals, and the neighboring CoNx moieties which have the optimum binding strength of reactants and facilitates the mass transfer. Read More

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http://dx.doi.org/10.1021/acsami.8b20003DOI Listing
February 2019

Fluorimetric detection of Candida albicans using cornstalk N-carbon quantum dots modified with amphotericin B.

Bioconjug Chem 2019 Feb 22. Epub 2019 Feb 22.

Due to the advanced fluorescence property of N-carbon quantum dots (N-CQDs), a new method to detect pathogenic fungi by newly synthesized cornstalk N-CQDs modified with water-soluble amphotericin B (N-CQDs@AmpB) was developed. Specifically, N-CQDs with blue fluorescence were initially synthesized according to a previous report and modified with amphotericin B on their surfaces. Subsequently, the as-prepared N-CQDs@AmpB was used to detect Candida albicans, exhibiting a linear range of 2. Read More

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http://dx.doi.org/10.1021/acs.bioconjchem.9b00131DOI Listing
February 2019

Lessons learned about steered molecular dynamics simulations and free energy calculations.

Chem Biol Drug Des 2019 Feb 22. Epub 2019 Feb 22.

CONICET-Facultad de Ciencias Exactas y Naturales, Instituto de Química-Física de los Materiales, Medio Ambiente y Energía, Universidad de Buenos Aires, Buenos Aires, Argentina.

The calculation of free energy profiles is central in understanding differential enzymatic activity, for instance, involving chemical reactions that require QM-MM tools, ligand migration, and conformational rearrangements that can be modeled using classical potentials. The use of steered molecular dynamics (sMD) together with the Jarzynski equality is a popular approach in calculating free energy profiles. Here, we first briefly review the application of the Jarzynski equality to sMD simulations, then revisit the so-called stiff-spring approximation and the consequent expectation of Gaussian work distributions and, finally, reiterate the practical utility of the second-order cumulant expansion, as it coincides with the parametric maximum-likelihood estimator in this scenario. Read More

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http://dx.doi.org/10.1111/cbdd.13485DOI Listing
February 2019

Efficiently Converting Thioether Waste to Organic Semiconductors by Carbon-Sulfur Bond Activation.

Angew Chem Int Ed Engl 2019 Feb 22. Epub 2019 Feb 22.

The Hong Kong University of Science and Technology, CHINA.

It is a sustainable development goal for human society to convert organic waste to valuable materials. Herein, 2-(methylthio)-bezothiazole (MTBT), an important organic waste in urban runoff, was catalytically converted to a series of organic semiconductors through carbon-sulfur bond activation. The efficient conversion of various substrates with different aromatic moieties and reacting functional groups (tin and boron) proved the generality of this novel diarylation Liebeskind-Srogl methodology. Read More

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http://dx.doi.org/10.1002/anie.201901274DOI Listing
February 2019

Efficient PMS activation by Zn/Fe-MOFs-derived ZnO/Fe O @carbon spheres for the degradation of Acid Orange 7.

Water Environ Res 2019 Feb 22. Epub 2019 Feb 22.

College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, China.

ZnO/Fe O @carbon spheres which synthesized via a calcination process used Zn/Fe metal organic frameworks (Zn/Fe-MOFs) as a precursor, were studied for the activation of peroxymonosulfate (PMS) for the degradation of Acid Orange 7 (AO7). The ZnO/Fe O @carbon spheres exhibited relatively high catalytic degradation properties for AO7 in an aqueous solution. The AO7 degradation reached 93. Read More

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http://dx.doi.org/10.1002/wer.1090DOI Listing
February 2019

Influence of impaired right ventricular contractile reserve on exercise capacity in patients with precapillary pulmonary hypertension: A study with exercise stress echocardiography.

Echocardiography 2019 Feb 22. Epub 2019 Feb 22.

Department of Echocardiography, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China.

Objectives: Right ventricular (RV) contractile reserve reflects the ability of RV to accommodate the increased afterload and may play an essential role in the evaluation of precapillary pulmonary hypertension (PH). This study aimed to assess RV contractile reserve based on exercise stress echocardiography (ESE) and to determine the echocardiographic determinants of exercise capacity in patients with precapillary PH.

Methods: A total of 31 patients with precapillary PH and 15 age- and sex-matched healthy control subjects were prospectively recruited. Read More

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http://dx.doi.org/10.1111/echo.14283DOI Listing
February 2019

The role of surface chemistry in serum protein corona-mediated cellular delivery and gene silencing with lipid nanoparticles.

Nanoscale 2019 Feb 22. Epub 2019 Feb 22.

Department of Pharmaceutical Sciences, School of Pharmacy, Northeastern University, Boston, MA 02115, USA.

Delivery of genetic medicines, such as small interfering RNA (siRNA), by lipid nanoparticles (LNPs) is a promising approach towards the treatment of diseases, such as solid tumors. However, in vitro and in vivo nanoparticle delivery efficiency is influenced by the formation of a protein corona in biological media. In this study, we have formulated four types of EnCore nanoparticles (F1 to F4) with a similar composition, but different polyethylene glycol (PEG) conjugated lipid chain lengths (carbon 14 vs. Read More

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http://dx.doi.org/10.1039/c8nr09855gDOI Listing
February 2019

Lanthanide terbium complex: synthesis, electrochemiluminescence (ECL) performance, and sensing application.

Analyst 2019 Feb 22. Epub 2019 Feb 22.

College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002, China.

In this study, a new lanthanide terbium complex, Tb(pzda)3(NO3)3·nH2O, was synthesized by a hydrothermal method and characterized by Fourier transform infrared spectroscopy (FT-IR) and energy-dispersive X-ray spectroscopy (EDS). It was found that the as-synthesized Tb-complex exhibited good electrochemiluminescence (ECL) behavior in the presence of triethanolamine (TEOA) in a HAc-NaAc buffer solution on a glassy carbon electrode. The possible reaction mechanism has been discussed based on the fluorescence spectra and ECL spectra. Read More

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http://dx.doi.org/10.1039/c9an00137aDOI Listing
February 2019

Access to 3-spiroindolizines containing an isoindole ring through intra-molecular arylation of spiro-N-acyliminium species: a new family of potent farnesyltransferase inhibitors.

Org Biomol Chem 2019 Feb 22. Epub 2019 Feb 22.

Normandie Univ, UNILEHAVRE, CNRS, URCOM, 76600 Le Havre, France.

Based on N-acyliminium species, two efficient and rapid approaches to diversify spirocyclic systems connected by two different carbon centers to the isoindole ring have been developed. The imide reduction and the tandem oxidative cleavage of olefin/formyl-amide equilibration were at first selected as the key steps for these strategies. Ultimately the intramolecular α-amidoalkylation reaction was achieved through the arylation of α-acetoxy lactams or α-hydroxy lactams using, respectively, a Lewis acid or a Brønsted acid depending on the nature of N-acyliminium precursors. Read More

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http://dx.doi.org/10.1039/c8ob02612bDOI Listing
February 2019

Syntheses, structures, magnetism and electrocatalytic oxygen evolution for four cobalt, manganese and copper complexes with dinuclear, 1D and 3D structures.

Dalton Trans 2019 Feb 22. Epub 2019 Feb 22.

Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China.

Four 3-(tetrazol-5-yl)-5-(pyrid-2-yl)-1,2,4-triazole (H2TPT) based complexes of [Co2(TPT)2(H2O)2] (1), [Mn2(TPT)2(H2O)2] (2), [Mn(TPT)(H2O)2]n (3) and [Cu(TPT)]n (4) have been solvothermally synthesized and structurally characterized by X-ray single-crystal diffraction analysis. Complexes 1 and 2 display isostructural dinuclear structures, while complex 3 exhibits a 1D zigzag chain structure. The structural difference for 2 and 3 may be caused by 100 and 160 °C temperature-controlled conditions. Read More

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http://dx.doi.org/10.1039/c9dt00227hDOI Listing
February 2019

Hollow CoO Nanosphere Surrounded by N-Doped Graphitic Carbon Filled within Multilayer-Sandwiched Graphene Network: A High-Performance Anode for Lithium Storage.

Inorg Chem 2019 Feb 22. Epub 2019 Feb 22.

We prepared a multilayer-sandwiched CoO/NGC/rGO composite by introducing in situ electrostatic self-assembly method with a subsequent thermal annealing induced Kirkendall effect. In the composite, the hollow CoO nanospheres surrounded by N-doped graphitic carbon (NGC) layer are tightly sandwiched between the reduced graphene oxide (rGO) layers. The layer-by-layer multilayer-sandwiched structure and strong electrostatic interaction bring the space confinement effect and close electrical contact between different components, which greatly strengthen the durability of the electrode structure and electron/ion transport kinetics. Read More

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http://dx.doi.org/10.1021/acs.inorgchem.8b03533DOI Listing
February 2019

"CO" as a convenient carbon bridge to build complex C2-branched glycosides using a palladium-catalyzed carbonylative Suzuki-Miyaura reaction from 2-iodoglycals.

J Org Chem 2019 Feb 22. Epub 2019 Feb 22.

Development of a palladium-catalyzed carbonylative Suzuki-Miyaura coupling reaction between 2-iodoglycal partners and diverse aryl-and alkenyl-boronic acids is presented, leading to original 2-ketoglycals. The newly formed carbonyl link could be exploited to access to 2-aryl/alkenyl-methylene-α-glucopyranoside scaffolds via a three steps sequence including an indium-mediated Ferrier-type reaction. Read More

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http://dx.doi.org/10.1021/acs.joc.8b03248DOI Listing
February 2019

Intracellular Zinc Quantification by Fluorescence Imaging with a FRET System.

Anal Chem 2019 Feb 22. Epub 2019 Feb 22.

Fluorescence imaging of cellular metals is widely reported. However, the quantification of intracellular metals with fluorescence imaging is so far not feasible and highly challenging. In this work, a ratiometric probe with two fluorescent labeled complementary DNA strains is designed for intracellular zinc quantification via fluorescence imaging, based on fluorescence resonance energy transfer (FRET) from carbon dots (CDs) to fluorescein (FAM). Read More

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http://dx.doi.org/10.1021/acs.analchem.9b00018DOI Listing
February 2019

Ultrafast yet controllable dual-responsive all-carbon actuator for implementing unusual mechanical movements.

ACS Appl Mater Interfaces 2019 Feb 22. Epub 2019 Feb 22.

Synthetic soft actuators with the integration of fast response speed, large-scale displacement and precise control over deformation direction are highly demanded for implementing agile and precise mechanical movements in smart robots, artificial muscles and biomimetic devices. In this work, ultrafast yet controllable all-carbon actuators are created based on graphene oxide and oriented carbon nanotubes. This all-carbon actuator shows humidity- and near infrared light-induced actuation with unprecedented performance integration, including ultrafast response (0. Read More

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http://dx.doi.org/10.1021/acsami.8b22099DOI Listing
February 2019

Polyhydroxyalkanoate Modified Bacterium Regulates Biomass Structure and Promotes Synthesis of Carbon Material for High-performance Supercapacitors.

ChemSusChem 2019 Feb 21. Epub 2019 Feb 21.

Central South University, School of Metallurgy and Environment, No.932, Lushannan Road, Yuelu District, 410083, Changsha, CHINA.

Biomass-derived carbon materials have been extensively explored as electrode materials in supercapacitors. However, selection of biomass with specific structure limits the synthesis of the advanced biomass-derived carbon materials. Here, we demonstrate a green and facile method for the synthesis of carbon material with nanoscale and microscale porous structures for supercapacitor based on regulating the original cell structure of bacterial strain. Read More

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http://dx.doi.org/10.1002/cssc.201802894DOI Listing
February 2019

Separation of betacyanins from flowers of Amaranthus cruentus L. in a polar solvent system by high-speed counter-current chromatography.

J Sep Sci 2019 Feb 21. Epub 2019 Feb 21.

Department of Analytical Chemistry, Institute C-1, Faculty of Chemical Engineering and Technology, Cracow University of Technology, Cracow, Poland.

Betacyanin extract of Amaranthus cruentus L. flowers was fractionated for the first time by semi-preparative high-speed counter-current chromatography in highly polar solvent system: Propan-1-ol - Acetonitrile - (NH ) SO - H O (1.0:0. Read More

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http://dx.doi.org/10.1002/jssc.201801172DOI Listing
February 2019

Twenty-first-century chemical odyssey: fuels versus commodities and cell factories versus chemical plants.

Microb Biotechnol 2019 Feb 22. Epub 2019 Feb 22.

CSIC - Estación Experimental del Zaidín, c/Profesor Albareda 1, 18008, Granada, Spain.

The harmful effects of pollution from the massive and widespread use of fossil fuels have led various organizations and governments to search for alternative energy sources. To address this, a new energy bioprocess is being developed that utilizes non-edible lignocellulose - the only sustainable source of organic carbon in nature. In this mini-review, we consider the potential use of synthetic biology to develop new-to-nature pathways for the biosynthesis of chemicals that are currently synthesized using classical industrial approaches. Read More

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http://dx.doi.org/10.1111/1751-7915.13379DOI Listing
February 2019

Toward High Power-High Energy Sodium Cathodes: A Case Study of Bicontinuous Ordered Network of 3D Porous Na (VO) (PO ) F/rGO with Pseudocapacitance Effect.

Small 2019 Feb 21:e1900356. Epub 2019 Feb 21.

Department of Materials Science and Engineering, Sun-Yat Sen University, Guangzhou, 510275, Guangdong, P. R. China.

Developing high power-high energy electrochemical energy storage systems is an ultimate goal in the energy storage field, which is even more difficult but significant for low-cost sodium ion batteries. Here, fluoride is successfully prepared by the electrostatic spray deposition (ESD) technique, which greatly expands the application scope of ESD. A two-step strategy (solvothermal plus ESD method) is proposed to construct a bicontinuous ordered network of 3D porous Na (VO) (PO ) F/reduced graphene oxide (NVOPF/rGO). Read More

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http://dx.doi.org/10.1002/smll.201900356DOI Listing
February 2019

From clear lakes to murky waters - tracing the functional response of high-latitude lake communities to concurrent 'greening' and 'browning'.

Ecol Lett 2019 Feb 21. Epub 2019 Feb 21.

Kilpisjärvi Biological Station, University of Helsinki, Helsinki, Finland.

Climate change and the intensification of land use practices are causing widespread eutrophication of subarctic lakes. The implications of this rapid change for lake ecosystem function remain poorly understood. To assess how freshwater communities respond to such profound changes in their habitat and resource availability, we conducted a space-for-time analysis of food-web structure in 30 lakes situated across a temperature-productivity gradient equivalent to the predicted future climate of subarctic Europe (temperature +3°C, precipitation +30% and nutrient +45 μg L total phosphorus). Read More

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http://dx.doi.org/10.1111/ele.13238DOI Listing
February 2019

Anticipating global terrestrial ecosystem state change using FLUXNET.

Glob Chang Biol 2019 Feb 22. Epub 2019 Feb 22.

School of Sustainability, Arizona State University, Tempe, AZ, USA.

Ecosystems can be characterized as complex systems that traverse a variety of functional and structural states in response to changing bioclimatic forcings. A central challenge of global change biology is the robust empirical description of these states and state transitions. An ecosystem's functional state can be empirically described using Process Networks (PN) that use timeseries observations to determine the strength of process-level functional couplings between ecosystem components. Read More

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http://dx.doi.org/10.1111/gcb.14602DOI Listing
February 2019

Nanoarchitectonics for Transition-Metal-Sulfide-Based Electrocatalysts for Water Splitting.

Adv Mater 2019 Feb 21:e1807134. Epub 2019 Feb 21.

International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.

Heterogenous electrocatalysts based on transition metal sulfides (TMS) are being actively explored in renewable energy research because nanostructured forms support high intrinsic activities for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, it is described how researchers are working to improve the performance of TMS-based materials by manipulating their internal and external nanoarchitectures. A general introduction to the water-splitting reaction is initially provided to explain the most important parameters in accessing the catalytic performance of nanomaterials catalysts. Read More

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http://dx.doi.org/10.1002/adma.201807134DOI Listing
February 2019

Scaling of phloem hydraulic resistance in stems and leaves of the understory angiosperm shrub Illicium parviflorum.

Am J Bot 2019 Feb 21. Epub 2019 Feb 21.

Department of Organismic and Evolutionary Biology, Harvard University, 16 Divinity Avenue, Cambridge, MA, 02138, USA.

Premise Of The Study: Recent studies in canopy-dominant trees revealed axial scaling of phloem structure. However, whether this pattern is found in woody plants of the understory, the environment of most angiosperms from the ANA grade (Amborellales-Nymphaeales-Austrobaileyales), is unknown.

Methods: We used seedlings and adult plants of the understory tropical shrub Illicium parviflorum, a member of the lineage Austrobaileyales, to explore the anatomy and physiology of the phloem in their aerial parts, including changes through ontogeny. Read More

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http://dx.doi.org/10.1002/ajb2.1241DOI Listing
February 2019

Electronic and magnetic properties of CoPc and FePc molecules on graphene: the substrate, defect, and hydrogen adsorption effects.

Phys Chem Chem Phys 2019 Feb 22. Epub 2019 Feb 22.

Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.

Transition metal phthalocyanines (TMPcs) are particularly appealing for spintronic processing and data storage devices due to their structural simplicity and functional flexibility. To realize effective control of the spins in TMPc-based systems, it is necessary to quantify how the structural and chemical environment of the molecule affects its spin center. Herein we perform a detailed investigation of the electronic and spintronic properties of vertically stacked heterostructures formed by CoPc or FePc adsorbed on a monolayer of graphene under the influences of the gold substrate, vacancies in graphene, and extra atomic hydrogen coordination on the TMPc. Read More

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http://dx.doi.org/10.1039/c8cp07091aDOI Listing
February 2019

Efficient synthesis of carbon-11 labelled acylsulfonamides using [C]CO carbonylation chemistry.

Chem Commun (Camb) 2019 Feb 22. Epub 2019 Feb 22.

Stanford University, School of Medicine, Department of Radiology, Molecular Imaging Program at Stanford (MIPS), 1201 Welch Road, PS049, Stanford, CA 4305-5484, USA.

Herein, a novel method for carbon-11 labeling of acyl sulfonamides by a one-step insertive [11C]CO carbonylative cross-coupling reaction between aryl halides and sulfonamides is presented. Various model compounds as well as drug molecules LY573636 (tasisulam) and ABT-199 were obtained in excellent yields. This method provides a valuable and widely applicable contribution to the continuously expanding radiochemical toolbox for PET research. Read More

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http://dx.doi.org/10.1039/c8cc09661aDOI Listing
February 2019

Immobilisation of sulphur on cathodes of lithium-sulphur batteries via B-doped atomic-layer carbon materials.

Phys Chem Chem Phys 2019 Feb 22. Epub 2019 Feb 22.

School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China.

Developing new host materials for cathodes and exploring their binding mechanisms in lithium-sulphur batteries are crucial issues since the present host materials exhibit low sulphur entrapment properties, thus resulting in the rapid decay of overall performance. In this work, we systematically investigated B-doped atomic-layer carbon materials as the cathode hosts of lithium-sulphur batteries via density functional theory calculations. Based on the analysis of optimised molecular structures, binding energies and surface charge densities, we found that B-doping can help materials suppress the dissolution of sulphides during cycles, further improving the performance of lithium-sulphur batteries. Read More

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http://dx.doi.org/10.1039/c8cp07736cDOI Listing
February 2019

Highly crystalline Ni-doped FeP/carbon hollow nanorods as all-pH efficient and durable hydrogen evolving electrocatalysts.

Sci Adv 2019 Feb 15;5(2):eaav6009. Epub 2019 Feb 15.

School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore.

Herein, we report the synthesis of uniform hollow nanorods of Ni-doped FeP nanocrystals hybridized with carbon as electrocataysts for the electrocatalytic hydrogen evolution reaction (HER). These hollow nanorods are prepared based on the etching and coordination reaction between metal-organic frameworks and phytic acid, followed by a pyrolysis process. Benefiting from the abundant active sites, the improved mass and charge transport capability, the optimized Ni-doped FeP/C hollow nanorods exhibit excellent HER activities for achieving a current density of 10 mA cm at an overpotential of 72, 117, and 95 mV in acidic, neutral, and alkaline media, respectively, as well as superior stability. Read More

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http://dx.doi.org/10.1126/sciadv.aav6009DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6377276PMC
February 2019

Lithiophilicity chemistry of heteroatom-doped carbon to guide uniform lithium nucleation in lithium metal anodes.

Sci Adv 2019 Feb 15;5(2):eaau7728. Epub 2019 Feb 15.

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.

The uncontrollable growth of lithium (Li) dendrites seriously impedes practical applications of Li metal batteries. Various lithiophilic conductive frameworks, especially carbon hosts, are used to guide uniform Li nucleation and thus deliver a dendrite-free composite anode. However, the lithiophilic nature of these carbon hosts is poorly understood. Read More

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http://dx.doi.org/10.1126/sciadv.aau7728DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6377277PMC
February 2019
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Extraordinary tensile strength and ductility of scalable nanoporous graphene.

Sci Adv 2019 Feb 15;5(2):eaat6951. Epub 2019 Feb 15.

Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21214, USA.

While the compressive strength-density scaling relationship of ultralight cellular graphene materials has been extensively investigated, high tensile strength and ductility have not been realized in the theoretically strongest carbon materials because of high flaw sensitivity under tension and weak van der Waals interplanar bonding between graphene sheets. In this study, we report that large-scale ultralight nanoporous graphene with three-dimensional bicontinuous nanoarchitecture shows orders of magnitude higher strength and elastic modulus than all reported ultralight carbon materials under both compression and tension. The high-strength nanoporous graphene also exhibits excellent tensile ductility and work hardening, which are comparable to well-designed metamaterials but until now had not been realized in ultralight cellular materials. Read More

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http://dx.doi.org/10.1126/sciadv.aat6951DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6377272PMC
February 2019

Data on the convenient fabrication of carbon doped WO ultrathin nanosheets for photocatalytic aerobic oxidation of amines at room temperature.

Data Brief 2019 Apr 21;23:103624. Epub 2018 Dec 21.

Resource Environment & Clean Energy Laboratory, School of Chemical and Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, China.

The oxidation of amines to imines is an important chemical transformation. In this article, we report original data on the synthesis of carbon doped WO ultrathin nanosheets via an acid-assisted one-pot process, which exhibit excellent photocatalytic activity in the aerobic oxidation of amines to corresponding imines under visible light irradiation at room temperature. The composition, microstructure, morphology, photocatalytic activity of the corresponding samples and possible mechanism are included here. Read More

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http://dx.doi.org/10.1016/j.dib.2018.12.062DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6370550PMC

Ultra-protective mechanical ventilation without extra-corporeal carbon dioxide removal for acute respiratory distress syndrome.

J Intensive Care Soc 2019 Feb 10;20(1):40-45. Epub 2018 May 10.

Department of Medicine, Division of Pulmonary, Critical Care and Environmental Medicine, University of Missouri, Columbia, MO, USA.

Background: Tidal hyperinflation can still occur with mechanical ventilation using low tidal volume (LVT) (6 mL/kg predicted body weight (PBW)) in acute respiratory distress syndrome (ARDS), despite a well-demonstrated reduction in mortality.

Methods: Retrospective chart review from August 2012 to October 2014. : Age >18years, PaO/FiO<200 with bilateral pulmonary infiltrates, absent heart failure, and ultra-protective mechanical ventilation (UPMV) defined as tidal volume (VT) <6 mL/kg PBW. Read More

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http://dx.doi.org/10.1177/1751143718774712DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6376584PMC
February 2019

Krill faecal pellets drive hidden pulses of particulate organic carbon in the marginal ice zone.

Nat Commun 2019 Feb 21;10(1):889. Epub 2019 Feb 21.

British Antarctic Survey, Cambridge, CB3 0ET, UK.

The biological carbon pump drives a flux of particulate organic carbon (POC) through the ocean and affects atmospheric levels of carbon dioxide. Short term, episodic flux events are hard to capture with current observational techniques and may thus be underrepresented in POC flux estimates. We model the potential hidden flux of POC originating from Antarctic krill, whose swarming behaviour could result in a major conduit of carbon to depth through their rapid exploitation of phytoplankton blooms and bulk egestion of rapidly sinking faecal pellets (FPs). Read More

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http://dx.doi.org/10.1038/s41467-019-08847-1DOI Listing
February 2019

Soluble Graphene Nanosheets for the Sunlight-Induced Photodegradation of the Mixture of Dyes and its Environmental Assessment.

Sci Rep 2019 Feb 21;9(1):2522. Epub 2019 Feb 21.

Department of Chemistry, Malaviya National Institute of Technology, Jaipur, Jaipur, 302017, India.

Currently, the air and water pollutions are presenting the most serious global concerns. Despite the well known tremendous efforts, it could be a promising sustainability if the black carbon (BC) soot can be utilized for the practical and sustainable applications. For this, the almost complete aqueous phase photodegradation of the three well-known organic pollutant dyes as crystal violet (CV); rhodamine B (RhB); methylene blue (MB) and their mixture (CV + RhB + MB), by using water-soluble graphene nanosheets (wsGNS) isolated from the BC soot under the influence of natural sunlight is described. Read More

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http://dx.doi.org/10.1038/s41598-019-38717-1DOI Listing
February 2019

The effect of 34-year continuous fertilization on the SOC physical fractions and its chemical composition in a Vertisol.

Sci Rep 2019 Feb 21;9(1):2505. Epub 2019 Feb 21.

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, P. R. China.

Reports regarding the effects of long-term organic and inorganic fertilization on the quantity and quality of soil organic carbon (SOC), particularly in Vertisols, are scarce. In this study, we combined SOC physical fractionation with C NMR spectroscopy technology to investigate the effect of 34 years of continuous fertilization on the SOC physical fractions and its chemical composition of 0-20 cm soil layer in a Vertisol. This study consisted of six treatments: no fertilization (control), chemical nitrogen, phosphorus and potassium fertilizers (NPK), low and high amounts of straw with chemical fertilizers (NPKLS and NPKHS), and pig or cattle manure with chemical fertilizers (NPKPM and NPKCM). Read More

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http://dx.doi.org/10.1038/s41598-019-38952-6DOI Listing
February 2019

A comparison of species specific sensitivities to changing light and carbonate chemistry in calcifying marine phytoplankton.

Sci Rep 2019 Feb 21;9(1):2486. Epub 2019 Feb 21.

Centre for Coastal Biogeochemistry, School of Environment Science and Engineering, Southern Cross University, Lismore, NSW, 2480, Australia.

Coccolithophores are unicellular marine phytoplankton and important contributors to global carbon cycling. Most work on coccolithophore sensitivity to climate change has been on the small, abundant bloom-forming species Emiliania huxleyi and Gephyrocapsa oceanica. However, large coccolithophore species can be major contributors to coccolithophore community production even in low abundances. Read More

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http://dx.doi.org/10.1038/s41598-019-38661-0DOI Listing
February 2019

Earth system models underestimate carbon fixation by plants in the high latitudes.

Nat Commun 2019 Feb 21;10(1):885. Epub 2019 Feb 21.

Max-Planck-Institute for Meteorology, Bundesstrasse 53, 20146, Hamburg, Germany.

Most Earth system models agree that land will continue to store carbon due to the physiological effects of rising CO concentration and climatic changes favoring plant growth in temperature-limited regions. But they largely disagree on the amount of carbon uptake. The historical CO increase has resulted in enhanced photosynthetic carbon fixation (Gross Primary Production, GPP), as can be evidenced from atmospheric CO concentration and satellite leaf area index measurements. Read More

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http://dx.doi.org/10.1038/s41467-019-08633-zDOI Listing
February 2019

Adjuvant therapy efficacy of Chinese drugs pharmaceutics for COPD patients with respiratory failure: a meta-analysis.

Biosci Rep 2019 Feb 21. Epub 2019 Feb 21.

China-Japan Friendship Hospital, NO.2, Yinghua East Road, Chaoyang District, NO.2, Yinghua East Road, Chaoyang District, Beijing, 100029, China.

We performed a meta-analysis to evaluate the efficacy and safety of western medicine combined with Tanreqing for patients with chronic obstructive pulmonary disease (COPD) and respiratory failure. We comprehensively searched several online databases from the times of their inception to November 2018. The trial quality was assessed using the bias risk tool recommended by the Cochrane library. Read More

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http://dx.doi.org/10.1042/BSR20182279DOI Listing
February 2019