23,699 results match your criteria phase evolution


Dual-high-frequency from single-piezoelectric crystal for ACE degradation by hybrid advanced oxidation UV-sonochemistry process.

Ultrason Sonochem 2021 Aug 19;78:105731. Epub 2021 Aug 19.

John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, US. Electronic address:

This study investigates the combination of two waves emitted from a single-piezoelectric crystal by use of a dual-frequency generator in a sonochemical reactor. The dual-frequency configurations analyzed were the double-modulated fundamental frequency (376-376 kHz), resonant and second harmonic, termed 376D, 376R and 376H respectively. The effect of the phase shift (Φ) and the percentage of modulation between added waves were described by the total acoustic power distribution (P) measured inside the sonoreactor. Read More

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Spurious phase correction in rapid metabolic imaging.

J Magn Reson 2021 Sep 8;332:107065. Epub 2021 Sep 8.

INRAE, UR QuaPA, F-63122 Saint-Gènes-Champanelle, France; INRAE, AgroResonance Facility, F-63122 Saint-Genès-Champanelle, France.

IDEAL-type magnetic resonance spectroscopic imaging (MRSI) sequences require the acquisition of several datasets using optimized sampling in the time domain to reconstruct metabolite maps. Each unitary scan consists of a selective slice (2D) or slab (3D) excitation followed by an evolution time and then the acquisition of the spatially encoded signal. It is critical that the phase variation during the evolution time for each scan is only dependent on chemical shifts. Read More

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September 2021

MRI and CT in the follow-up after irreversible electroporation of small renal masses.

Diagn Interv Radiol 2021 Sep;27(5):654-663

Department of Radiology, Academic Medical Center, Amsterdam, The Netherlands.

Purpose: Ablation plays a growing role in the treatment of small renal masses (SRMs) due to its nephron sparing properties and low invasiveness. Irreversible electroporation (IRE) has the potential, although still experimental, to overcome current limitations of thermal ablation. No prospective imaging studies exist of the ablation zone in the follow up after renal IRE in humans. Read More

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September 2021

Cosmology of Sub-MeV Dark Matter Freeze-In.

Phys Rev Lett 2021 Sep;127(11):111301

Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Dark matter (DM) could be a relic of freeze-in through a light mediator, where the DM is produced by extremely feeble, IR-dominated processes in the thermal standard model plasma. In the simplest viable models with DM lighter than 1 MeV, the DM has a small effective electric charge and is born with a nonthermal phase-space distribution. This DM candidate would cause observable departures from standard cosmological evolution. Read More

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September 2021

Combination therapies for COVID-19: an overview of the clinical trials landscape.

Br J Clin Pharmacol 2021 Sep 23. Epub 2021 Sep 23.

National Institute for Health Research (NIHR) Innovation Observatory, Population Health Sciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK.

The COVID-19 pandemic has driven an unprecedented level of global activity in drug discovery and clinical development for effective therapeutics targeting the coronavirus disease. There are currently 744 therapeutics being tested in 2879 clinical trials globally. Almost 90% of these clinical trials are focused on monotherapies. Read More

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September 2021

CoMoN-An efficient multifunctional electrocatalyst.

Innovation (N Y) 2021 May 17;2(2):100096. Epub 2021 Mar 17.

Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.

Efficient catalysts are required for both oxidative and reductive reactions of hydrogen and oxygen in sustainable energy conversion devices. However, current precious metal-based electrocatalysts do not perform well across the full range of reactions and reported multifunctional catalysts are all complex hybrids. Here, we show that single-phase porous CoMoN prepared via a facile method is an efficient and reliable electrocatalyst for three essential energy conversion reactions; oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and hydrogen evolution reaction (HER) in alkaline solutions. Read More

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Evolution of the Toroidal Flux of CME Flux Ropes during Eruption.

Innovation (N Y) 2020 Nov 5;1(3):100059. Epub 2020 Nov 5.

School of Astronomy and Space Science, Nanjing University, Nanjing 210046, China.

Coronal mass ejections (CMEs) are large-scale explosions of the coronal magnetic field. It is believed that magnetic reconnection significantly builds up the core structure of CMEs, a magnetic flux rope, during the eruption. However, the quantitative evolution of the flux rope, particularly its toroidal flux, is still unclear. Read More

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November 2020

Dynamic Development of White Lupin Rootlets Along a Cluster Root.

Front Plant Sci 2021 7;12:738172. Epub 2021 Sep 7.

BPMP, Univ Montpellier, CNRS, INRAE, Institut Agro, Montpellier, France.

White lupin produces cluster roots in response to phosphorus deficiency. Along the cluster root, numerous short rootlets successively appear, creating a spatial and temporal gradient of developmental stages that constitutes a powerful biological model to study the dynamics of the structural and functional evolution of these organs. The present study proposes a fine histochemical, transcriptomic and functional analysis of the rootlet development from its emergence to its final length. Read More

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September 2021

Valsartan in early-stage hypertrophic cardiomyopathy: a randomized phase 2 trial.

Nat Med 2021 Sep 23. Epub 2021 Sep 23.

Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA.

Hypertrophic cardiomyopathy (HCM) is often caused by pathogenic variants in sarcomeric genes and characterized by left ventricular (LV) hypertrophy, myocardial fibrosis and increased risk of heart failure and arrhythmias. There are no existing therapies to modify disease progression. In this study, we conducted a multi-center, double-blind, placebo-controlled phase 2 clinical trial to assess the safety and efficacy of the angiotensin II receptor blocker valsartan in attenuating disease evolution in early HCM. Read More

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September 2021

Magneto-hydrodynamics of multi-phase flows in heterogeneous systems with large property gradients.

Sci Rep 2021 Sep 23;11(1):18998. Epub 2021 Sep 23.

The Department of Materials, The University of Manchester, Manchester, UK.

The complex interplay between thermal, hydrodynamic, and electromagnetic, forces governs the evolution of multi-phase systems in high technology applications, such as advanced manufacturing and fusion power plant operation. In this work, a new formulation of the time dependent magnetic induction equation is fully coupled to a set of conservation laws for multi-phase fluid flow, energy transport and chemical species transport that describes melting and solidification state transitions. A finite-volume discretisation of the resulting system of equations is performed, where a novel projection method is formulated to ensure that the magnetic field remains divergence free. Read More

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September 2021

Coherent Acoustic Interferometry during the Photodriven Oxygen Evolution Reaction Associates Strain Fields with the Reactive Oxygen Intermediate (Ti-OH*).

J Am Chem Soc 2021 Sep 23. Epub 2021 Sep 23.

Renewable and Sustainable Energy Institute (RASEI), University of Colorado, Boulder, Boulder, Colorado 80303, United States.

The oxygen evolution reaction (OER) from water requires the formation of metastable, reactive oxygen intermediates to enable oxygen-oxygen bond formation. Conversely, such reactive intermediates could also structurally modify the catalyst. A descriptor for the overall catalytic activity, the first electron and proton transfer OER intermediate from water, (M-OH*), has been associated with significant distortions of the metal-oxygen bonds upon charge-trapping. Read More

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September 2021

Designing dna probe from hpv 18 and 58 in e6 region for sensing element in the development of genosensor based gold nanoparticles.

Biotechnol Appl Biochem 2021 Sep 23. Epub 2021 Sep 23.

Malaysia Genome Institute (MGI), National Institute of Biotechnology (NIBM), Kajang, Selangor, 43000, Malaysia.

E6 region has higher protuberant probability annealing than consensus probe focusing on another region in Human Papillomavirus (HPV) genome in terms of detection and screening method. Here, we designed the first multiple virus ssDNA for multiple detections in an early phase of screening for cervical cancer in the E6 region and became a fundamental evolution of detection electrochemical HPV biosensor. Gene profiling of the virus ssDNA sequences have been carried by high-end bioinformatics tools such as GenBank, Basic Local Alignment Searching Tools (BLAST), and Clustal OMEGA in a row. Read More

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September 2021

High incidence of asymptomatic phase I IgG seroconversion after acute Q fever episode: implications for chronic Q fever diagnosis.

Clin Infect Dis 2021 Sep 23. Epub 2021 Sep 23.

Unidad de Enfermedades Infecciosas y Microbiología. Hospital Universitario de Valme. Instituto de Biomedicina de Sevilla (IBiS). Universidad de Sevilla. Sevilla, Spain.

Background: The aim of this study was to describe the natural history of acute Q fever, including its clinical and serological evolution and progression to chronic Q fever.

Methods: Observational cohort study (January 2011-September 2020) performed at Valme University Hospital (Seville, Spain). Inclusion criteria: 1) Patients over the age of eighteen; 2) Acute Q fever diagnosis, defined as suggestive symptoms in the presence of phase II IgG titer > 1:256; 3) At least 6 months follow-up after the acute Q fever episode. Read More

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September 2021

From Two-, One-, to Zero-Dimensional Vacancies: A Densification Pattern for a Typcial Transition-Metal Dichalcogenide of TiSe.

J Phys Chem Lett 2021 Sep 23:9422-9428. Epub 2021 Sep 23.

School of Physics and Electronics, Hunan University, Changsha 410082, China.

In the areas of condensed matter physics, geoscience, material science, and inorganic chemistry, how the crystal structures evolve under an external field such as high-pressure is a fundamental question. By taking TiSe as the case, we investigate the phase transformations of the layered transition-metal dichalcogenides (TMDs) under high-pressure. The ambient 6-fold -31 TiSe undergoes a transformation into the monoclinic 8-fold coordinated 2/ phase at 15 GPa and then into the hexagonal 9-fold FeP-type structure at 34 GPa. Read More

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September 2021

Recherche sur la fin de vie, la nécessité d’un consensus : premiers résultats.

Sante Publique 2021 March-April;33(2):191-198

During the past 15 years, in France, like in many European countries, the attention paid to patients at the end of their lives has continued to grow. But in the meantime, only a few researchers have managed to collect reliable data on End-of-Life Care and to implement scientific studies describing the reality of these situations. This difficulty is due in particular to the lack of a recognized and operational definition of the end of life. Read More

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September 2021

Wnt16 protects chondrocytes from lumbar facet joint osteoarthritis through the Wnt/β-catenin pathway in low back pain patients.

Somatosens Mot Res 2021 Sep 23:1-8. Epub 2021 Sep 23.

Department of Spine Surgery, Affiliated Hospital 2 of Nantong University, Nantong University, The First People's Hospital of Nantong, Nantong, PR China.

Purpose: Low back pain (LBP) is a long-lasting and chronic symptom without any exact cause. This study attempts to propose a new staging system based on the original grading system combined with pathological results and clinical symptoms to better clarify the dynamic evolution of LBP related to cartilage degeneration during facet joint osteoarthritis (FJOA). To explore a potential target for diagnosis, treatment, and drug intervention of facet joint osteoarthritis related LBP via protecting chondrocytes. Read More

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September 2021

Bayesian phase difference estimation: a general quantum algorithm for the direct calculation of energy gaps.

Phys Chem Chem Phys 2021 Sep 22;23(36):20152-20162. Epub 2021 Sep 22.

Department of Chemistry and Molecular Materials Science, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan.

Quantum computers can perform full configuration interaction (full-CI) calculations by utilising the quantum phase estimation (QPE) algorithms including Bayesian phase estimation (BPE) and iterative quantum phase estimation (IQPE). In these quantum algorithms, the time evolution of wave functions for atoms and molecules is simulated conditionally with an ancillary qubit as the control, which make implementation to real quantum devices difficult. Also, most of the problems in chemistry discuss energy differences between two electronic states rather than total energies themselves, and thus direct calculations of energy gaps are promising for future applications of quantum computers to real chemistry problems. Read More

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September 2021

In Situ Co-O Bond Reinforcement of the Artificial Cathode Electrolyte Interphase in Highly Delithiated LiCoO for High-Energy-Density Applications.

ACS Appl Mater Interfaces 2021 Sep 22. Epub 2021 Sep 22.

Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan.

Highly delithiated LiCoO has high specific capacity (>200 mAh g); however, its degradation behavior causes it to have poor electrochemical performance and thermal instability. The degradation of highly delithiated LiCoO is mainly induced by oxygen vacancy migration and weakening of oxygen-related interactions, which result in pitting corrosion and fault formation on the surface. In this research, a coupling agent, namely, 3-aminopropyltriethoxysilane (APTES), was grafted onto the surface of LiCoO to form a cross-linking structure. Read More

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September 2021

Enhancing the interfacial stability of LiNiCoAlO cathode materials by a surface-concentration gradient strategy.

Dalton Trans 2021 Sep 22. Epub 2021 Sep 22.

School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China.

Ni-rich LiNiCoAlO materials have been successfully applied in electric vehicles due to the merits of high energy density which can meet the requirements for driving range. Nevertheless, the electrochemical performances of Ni-rich materials are limited by their structural instability. Herein, LiNiCoAlO materials with the concentration-gradient structure of a Ni-rich core and a Co-rich surface were synthesized. Read More

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September 2021

Facile one-step synthesis of Ru doped NiCoP nanoparticles as highly efficient electrocatalysts for oxygen evolution reaction.

Chem Asian J 2021 Sep 21. Epub 2021 Sep 21.

Korea Institute of Science and Technology, Hydrogen Fuel Cell Research Center, KOREA, REPUBLIC OF.

Transition metal phosphides (TMPs) as ever-evolving electrocatalytic materials have attracted increasing attention in water splitting reaction owing to their cost-effective, highly active and stable catalytic properties. This work presents a facile synthetic route to NiCoP nanoparticles with Ru dopants which function as highly efficient electrocatalysts for oxygen evolution reaction (OER) in alkaline media. The Ru dopants induced a high content of Ni and Co vacancies in NiCoP nanoparticles, and the more defective Ru doped NiCoP phase than undoped NiCoP ones led to a greater number of catalytically active sites and improved electrical conductivity after undergoing electrochemical activation. Read More

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September 2021

Effect of Basicity on the Microstructure of Sinter and Its Application Based on Deep Learning.

Comput Intell Neurosci 2021 9;2021:1082834. Epub 2021 Sep 9.

School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China.

The influence of the evolution rule of basicity (0.6∼2.4) on the mineral composition and microstructure of sinter is studied by using a polarizing microscope, and the comprehensive application analysis of the drum index, vertical sintering speed, and yield of sinter shows that, over the course of an increase in basicity (0. Read More

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September 2021

Topological phase transition in chiral graphene nanoribbons: from edge bands to end states.

Nat Commun 2021 Sep 20;12(1):5538. Epub 2021 Sep 20.

CIC nanoGUNE-BRTA, Donostia-San Sebastián, Spain.

Precise control over the size and shape of graphene nanostructures allows engineering spin-polarized edge and topological states, representing a novel source of non-conventional π-magnetism with promising applications in quantum spintronics. A prerequisite for their emergence is the existence of robust gapped phases, which are difficult to find in extended graphene systems. Here we show that semi-metallic chiral GNRs (chGNRs) narrowed down to nanometer widths undergo a topological phase transition. Read More

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September 2021

Wood Anatomy of Douglas-Fir in Eastern Arizona and Its Relationship With Pacific Basin Climate.

Front Plant Sci 2021 1;12:702442. Epub 2021 Sep 1.

GFZ German Research Centre for Geosciences, Potsdam, Germany.

Dendroclimatic reconstructions, which are a well-known tool for extending records of climatic variability, have recently been expanded by using wood anatomical parameters. However, the relationships between wood cellular structures and large-scale climatic patterns, such as El Niño-Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO), are still not completely understood, hindering the potential for wood anatomy as a paleoclimatic proxy. To better understand the teleconnection between regional and local climate processes in the western United States, our main objective was to assess the value of these emerging tree-ring parameters for reconstructing climate dynamics. Read More

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September 2021

The Coevolution of RuBisCO, Photorespiration, and Carbon Concentrating Mechanisms in Higher Plants.

Authors:
Peter L Cummins

Front Plant Sci 2021 1;12:662425. Epub 2021 Sep 1.

Department of Genome Sciences, John Curtin School of Medical Research, The Australian National University, Canberra, ACT, Australia.

Ribulose-1,5-bisphosphate (RuBP) carboxylase/oxygenase (RuBisCO) is the carbon-fixing enzyme present in most photosynthetic organisms, converting CO into organic matter. Globally, photosynthetic efficiency in terrestrial plants has become increasingly challenged in recent decades due to a rapid increase in atmospheric CO and associated changes toward warmer and dryer environments. Well adapted for these new climatic conditions, the C photosynthetic pathway utilizes carbon concentrating mechanisms to increase CO concentrations surrounding RuBisCO, suppressing photorespiration from the oxygenase catalyzed reaction with O. Read More

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September 2021

Origin of Cyanobacteria thylakoids via a non-vesicular glycolipid phase transition and impact on the Great Oxygenation Event.

J Exp Bot 2021 Sep 19. Epub 2021 Sep 19.

Laboratoire de Physiologie Cellulaire et Végétale; INRAE, CNRS, CEA, Université Grenoble Alpes; IRIG; CEA Grenoble; 17 rue des Martyrs, 38000 Grenoble, France.

Appearance of oxygenic photosynthesis in Cyanobacteria is a major event in the evolution of Life. It had an irreversible impact on our planet, promoting the Great Oxygenation Event (GOE), ~2.4 b. Read More

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September 2021

Hydrated electrons mediated in-situ construction of cubic phase CdS/Cd thin layer on a millimeter-scale support for photocatalytic hydrogen evolution.

J Colloid Interface Sci 2021 Sep 8;607(Pt 1):769-781. Epub 2021 Sep 8.

TJU-NIMS International Collaboration Laboratory, Tianjin University, No. 92 Weijin Road, Nankai District, Tianjin 300072, People's Republic of China; International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.

In this study, non-noble metal Cd decorated cubic phase CdS (CdS/Cd) thin layer on a millimeter-scale chitosan-Mg(OH) xerogel beads (CMB) were elaborately designed and successfully synthesized via facile hydrated electrons (e) assistant strategy. The in-situ formation of metallic Cd was driven by e generated from UV/NaSO process. Owing to metallic Cd, [email protected]/Cd exhibited better visible-light absorption ability and more efficient separation capability for photo-induced carriers, its hydrogen production efficiency was about threefold improved compared to [email protected] Read More

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September 2021

Constitutive expression and discovery of antimicrobial peptides in Zygogramma bicolorata (Coleoptera: Chrysomelidae).

Proteins 2021 Sep 18. Epub 2021 Sep 18.

Department of Biochemistry and Biochemical Engineering, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj, India.

The expression, identification, and discovery of less toxic antimicrobial peptides (AMPs) are significant in managing infectious pathogens. AMPs triggered in response to the immune system have evolved to defend against pathogens and wounding. The protein composition of Zygogramma bicolorata hemolymph is of diagnostic importance as the open circulatory systems of the insects involve signaling through hemolymph. Read More

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September 2021

Molecular dynamics investigation of structure evolution and thermodynamics of Ni-Fe nanoparticles during inert gas condensation.

J Mol Model 2021 Sep 18;27(10):288. Epub 2021 Sep 18.

School of Materials Science and Engineering, Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan, 430070, China.

Synthesis of magnetic nanoparticles is relevant to many applications in the fields of catalysis, energy storage, and biomedicine. Understanding the growth mechanisms and morphology of nanoparticles during inert gas condensation is crucial to rationally improve the performance of the final nanoparticles. In this work, molecular dynamics simulations are carried out to study the structural and thermodynamic behavior of Ni-Fe nanoparticles from homogenous vapor phase in Ar atmosphere. Read More

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September 2021

Prospective analysis of myocardial strain through the evolution of Chagas disease in the hamster animal model.

Int J Cardiovasc Imaging 2021 Sep 18. Epub 2021 Sep 18.

Cardiology Division, Internal Medicine Department, Cardiology Center of the Medical School of Ribeirão Preto, University of São Paulo Ribeirão Preto, Bandeirantes Avenue, 3900, Ribeirão Preto, São Paulo, 14049-900, Brazil.

Speckle tracking echocardiography (STE) enables early diagnosis of myocardial damage by evaluating myocardial strain. We aimed to study sequential changes in structural and ventricular functional parameters during Chagas disease (CD) natural history in an animal model. 37 Syrian hamsters were inoculated intraperitoneally with Trypanosoma cruzi (Chagas) and 20 with saline (Control). Read More

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September 2021

Atomic-scale imaging of CHNHPbI structure and its decomposition pathway.

Nat Commun 2021 Sep 17;12(1):5516. Epub 2021 Sep 17.

Electron Microscopy Laboratory, International Center for Quantum Materials, School of Physics, Peking University, Beijing, China.

Understanding the atomic structure and structural instability of organic-inorganic hybrid perovskites is the key to appreciate their remarkable photoelectric properties and understand failure mechanism. Here, using low-dose imaging technique by direct-detection electron-counting camera in a transmission electron microscope, we investigate the atomic structure and decomposition pathway of CHNHPbI (MAPbI) at the atomic scale. We successfully image the atomic structure of perovskite in real space under ultra-low electron dose condition, and observe a two-step decomposition process, i. Read More

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September 2021