827,906 results match your criteria oxide synthase-like


Nitrogen-carbon materials base on pyrolytic graphene hydrogel for oxygen reduction.

J Colloid Interface Sci 2021 Jun 8;602:274-281. Epub 2021 Jun 8.

Lab of Advanced Nano-structures & Transfer Processes, Department of Chemical Engineering, Tianjin University, Tianjin 300354, China; Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031 China. Electronic address:

Hypothesis: Oxygen reduction reaction (ORR) has played a significant role in the utilization of energy nowadays. Nitrogen-doped carbon materials are seen as promising catalysts for ORR, so it is of great significance in studying the functions of different nitrogen moieties.

Experiments: The graphene hydrogel-based nitrogen-arbon materials (GH N-C) were fabricated by first obtaining a gel through hydrothermal treatment using graphene oxide (GO) as precursor, and then calcined in an ammonia atmosphere at different temperatures to form N-doped graphitized materials with divers nitrogen configuration. Read More

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Modification of ordered mesoporous carbon for removal of environmental contaminants from aqueous phase: A review.

J Hazard Mater 2021 May 30;418:126266. Epub 2021 May 30.

College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou University, Yangzhou 225127, Jiangsu, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, China. Electronic address:

Contamination of water bodies by potentially toxic elements and organic pollutants has aroused extensive concerns worldwide. Thus it is significant to develop effective adsorbents for removing these contaminants. As a new member of carbonaceous material families (activated carbon, biochar, and graphene), ordered mesoporous carbon (OMC) with larger specific surface area, ordered pore structure, and higher pore volume are being evaluated for their use in contaminant removal. Read More

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Efficient heavy metal removal from water by alginate-based porous nanocomposite hydrogels: The enhanced removal mechanism and influencing factor insight.

J Hazard Mater 2021 Jun 8;418:126358. Epub 2021 Jun 8.

School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China; Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China. Electronic address:

Novel porous alginate-based nanocomposite hydrogels were prepared by incorporating polyaniline-polypyrrole modified graphene oxide ([email protected]) as reinforcing fillers into the alginate matrix ([email protected]/SA) for Cr(VI) and Cu(II) removal from water. Different in-situ co-polymerization functionalized GO with Py-to-An mass ratios of monomers (from nil to 1:1) and contents of [email protected] (from nil to 2.0%(w/v)) were embedded into the alginate backbone to improve the sorption performance. Read More

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Indicator of redox in soil (IRIS) films as a water management tool for rice farmers.

J Environ Manage 2021 Jun 12;294:112920. Epub 2021 Jun 12.

Department of Plant and Soil Sciences, 531 S. College Avenue, Townsend Hall Rm 152, University of Delaware, Newark, DE, 19716, USA. Electronic address:

Rice is a crucial part of the world's food supply but is also susceptible to uptake of contaminants including arsenic (As) and cadmium (Cd) depending on the soil redox potential. Careful control of soil redox state by implementing alternate wetting and drying (AWD) water management can decrease mobility of soil As and Cd, but can be difficult to manage. Indicators of reduction in soil (IRIS) tubes and films have been studied by pedologists for wetland delineation; here, we explore the use of the IRIS film technology as passive samplers of soil redox potential in rice paddies. Read More

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Synthesis and pharmacological evaluation of pomalidomide derivatives useful for sickle cell disease treatment.

Bioorg Chem 2021 Jun 10;114:105077. Epub 2021 Jun 10.

São Paulo State University (UNESP), School of Pharmaceutical Sciences, Araraquara 14800-903, Brazil. Electronic address:

Fetal hemoglobin (HbF) induction constitutes a valuable and validated approach to treat the symptoms of sickle cell disease (SCD). Here, we synthesized pomalidomide-nitric oxide (NO) donor derivatives (3a-f) and evaluated their suitability as novel HbF inducers. All compounds demonstrated different capacities of releasing NO, ranging 0. Read More

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Glioblastoma-specific anticancer activity of newly synthetized 3,5-disubstituted isoxazole and 1,4-disubstituted triazole-linked tyrosol conjugates.

Bioorg Chem 2021 Jun 8;114:105071. Epub 2021 Jun 8.

University of Monastir, Faculty of Science of Monastir, Laboratory of Heterocyclic, Chemistry, Natural Products and Reactivity, TeamMedicinal Chemistry and Natural, Products (LR11ES39), Department of Chemistry, Avenue of Environment, 5019 Monastir, Tunisia. Electronic address:

Two series of 3,5-disubstituted isoxazoles (6a-e) and 1,4-disubstituted triazoles (8a-e) derivatives have been synthesized from tyrosol (1), a natural phenolic compound, detected in several natural sources such as olive oil, and well-known by its wide spectrum of biological activities. Copper-catalyzed microwave-assisted 1,3-dipolar cycloaddition reactions between tyrosol-alkyne derivative 2 and two series of aryl nitrile oxides (5a-e) and azides (7a-e) regiospecifically afforded 3,5-disubstituted isoxazoles (6a-e) and 1,4-triazole derivatives (8a-e), respectively in quantitative yields. Synthesized compounds were purified and characterized by spectroscopic means including 1D and 2D NMR techniques and HRMS analysis. Read More

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Treg and IL-1 receptor type 2-expressing CD4 T cell-deleted CD4 T cell fraction prevents the progression of age-related hearing loss in a mouse model.

J Neuroimmunol 2021 Jun 8;357:577628. Epub 2021 Jun 8.

Department of Otolaryngology, Head and Neck Surgery, Kansai Medical University, Hirakata, Osaka, Japan.

We investigated the association between cellular immunity and age-related hearing loss (ARHL) development using three CD4 T cell fractions, namely, naturally occurring regulatory T cells (Treg), interleukin 1 receptor type 2-expressing T cells (I1R2), and non-Treg non-I1R2 (nTnI) cells, which comprised Treg and I1R2-deleted CD4 T cells. Inoculation of the nTnI fraction into a ARHL murine model, not only prevented the development of ARHL and the degeneration of spiral ganglion neurons, but also suppressed serum nitric oxide, a source of oxidative stress. Further investigations on CD4 T cell fractions could provide novel insights into the prevention of aging, including presbycusis. Read More

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Global Reach 2018: nitric oxide-mediated cutaneous vasodilation is reduced in chronic, but not acute, hypoxia independently of enzymatic superoxide formation.

Free Radic Biol Med 2021 Jun 12. Epub 2021 Jun 12.

Department of Kinesiology, University of Texas at Arlington, Arlington, TX, USA. Electronic address:

We tested the hypotheses that 1) cutaneous microvascular function is impaired by acute normobaric and chronic hypobaric hypoxia and 2) that the superoxide free radical (via NADPH oxidase or xanthine oxidase) contributes to this impairment via nitric oxide (NO) scavenging. Local heating-induced cutaneous hyperemia (39°C) was measured in the forearm of 11 male lowlanders at sea level (SL) and following 14-18 days at high altitude (HA; 4340 m in Cerro de Pasco, Peru), and compared to 11 highlanders residing permanently at this elevation. Cutaneous vascular conductance (CVC; laser-Doppler flux/mean arterial pressure) was not different during 39°C [control site: 73 (19) vs. Read More

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Osmolyte enhanced aqueous two-phase system for virus purification.

Biotechnol Bioeng 2021 Jun 15. Epub 2021 Jun 15.

Department of Chemical Engineering, Michigan Technological University, Houghton, Michigan, USA.

Due to the high variation in viral surface properties, a platform method for virus purification is still lacking. A potential alternative to the high-cost conventional methods is aqueous two-phase systems (ATPSs). However, optimizing virus purification in ATPS requires a large experimental design space, and the optimized systems are generally found to operate at high ATPS component concentrations. Read More

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Levels of Trimethylamine N-Oxide Remain Elevated Long Term After Left Ventricular Assist Device and Heart Transplantation and Are Independent From Measures of Inflammation and Gut Dysbiosis.

Circ Heart Fail 2021 Jun 15;14(6):e007909. Epub 2021 Jun 15.

Department of Epidemiology, Mailman School of Public Health (S.M., R.T.D.), Columbia University Irving Medical Center, New York, NY.

Background: Trimethylamine N-oxide (TMAO)-a gut-derived metabolite-is elevated in heart failure (HF) and linked to poor prognosis. We investigated variations in TMAO in HF, left ventricular assist device (LVAD), and heart transplant (HT) and assessed its relation with inflammation, endotoxemia, oxidative stress, and gut dysbiosis.

Methods: We enrolled 341 patients. Read More

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Utility of fractional exhaled nitric oxide in interstitial lung disease.

J Breath Res 2021 Jun 16;15(3). Epub 2021 Jun 16.

Department of Pulmonology, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, People's Republic of China.

The majority of interstitial lung diseases (ILDs) develop rapidly and are associated with a poor prognosis. Therefore, new noninvasive markers are needed to guide the classification and prognostication of ILD. We enrolled 95 patients with ILD, including dermatomyositis-associated ILD (69), Sjögren's syndrome-associated ILD (= 7), mixed connective tissue disease-associated ILD (= 9), idiopathic pulmonary fibrosis (= 5) and hypersensitivity pneumonitis (= 5), 82 patients with connective tissue disease but without ILD as well as 24 healthy controls, then evaluated fractional exhaled nitric oxide (FeNO50; 50 ml s) (Bisenkov20069-14), pulmonary function and high-resolution computed tomography (HRCT) scores. Read More

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Secondary Phosphine Oxide Functionalized Gold Clusters and Their Application in Photoelectrocatalytic Hydrogenation Reactions.

J Am Chem Soc 2021 Jun 15. Epub 2021 Jun 15.

Institut für Chemie and IRIS Adlershof, Humboldt-Universität zu Berlin, Berlin 12489, Germany.

Ligands in ligand-protected metal clusters play a crucial role, not only because of their interaction with the metal core, but also because of the functionality they provide to the cluster. Here, we report the utilization of secondary phosphine oxide (SPO), as a new family of functional ligands, for the preparation of an undecagold cluster . Different from the commonly used phosphine ligand (i. Read More

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Sub-4 nm Nanodiamonds from Graphene-Oxide and Nitrated Polycyclic Aromatic Hydrocarbons at 423 K.

ACS Nano 2021 Jun 15. Epub 2021 Jun 15.

SEU-FEI Nano-Pico Center, Key Lab of MEMS of Ministry of Education, Collaborative Innovation Center for Micro/Nano Fabrication, Device and System, Southeast University, Nanjing 210096, People's Republic of China.

Nanodiamonds are interesting materials from the point of view of their biocompatibility and their chemical, spectroscopic, and mechanical properties. Current synthetic methods for nanodiamonds involve harsh environments, which are potentially hazardous in addition to being expensive. We report a low-temperature (423 K) hydrothermal approach to form nanodiamonds by using graphene-oxide or nitrated polycyclic aromatic hydrocarbons (naphthalene, anthracene, phenanthrene, or pyrene) as a starting material. Read More

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Graphene-coated nanoporous nickel towards a metal-catalyzed oxygen evolution reaction.

Nanoscale 2021 Jun 15. Epub 2021 Jun 15.

Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA. and WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.

Developing highly active electrocatalysts with low costs and long durability for oxygen evolution reactions (OERs) is crucial towards the practical implementations of electrocatalytic water-splitting and rechargeable metal-air batteries. Anodized nanostructured 3d transition metals and alloys with the formation of OER-active oxides/hydroxides are known to have high catalytic activity towards OERs but suffer from poor electrical conductivity and electrochemical stability in harsh oxidation environments. Here we report that high OER activity can be achieved from the metallic state of Ni which is passivated by atomically thick graphene in a three-dimensional nanoporous architecture. Read More

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Chalcogen-atom abstraction reactions of a Di-iron imidophosphorane complex.

Chem Commun (Camb) 2021 Jun 15. Epub 2021 Jun 15.

Department of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA. and Nuclear and Radiological Engineering Program, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA.

Reaction of the complexes [Fe2(μ2-NP(pip)3)2(NP(pip)3)2] (1-Fe) and [Co2(μ2-NP(pip)3)2(NP(pip)3)2] (1-Co), where [NP(pip)3]1- is tris(piperidinyl)imidophosphorane, with nitrous oxide, S8, or Se0 results in divergent reactivity. With nitrous oxide, 1-Fe forms [Fe2(μ2-O)(μ2-NP(pip)3)2(NP(pip)3)2] (2-Fe), with a very short Fe3+-Fe3+ distance. Reactions of 1-Fe with S8 or Se0 result in the bridging, side-on coordination (μ-κ1:κ1-E22-) of the heavy chalcogens in complexes [Fe2(μ-κ1:κ1-E2)(μ2-NP(pip)3)2(NP(pip)3)2] (E = S, 3-Fe, or Se, 4-Fe). Read More

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Dendrocrepidamine, a novel octahydroindolizine alkaloid from the roots of .

J Asian Nat Prod Res 2021 Jun 15:1-8. Epub 2021 Jun 15.

School of Traditional Chinese Medicines, China Pharmaceutical University, Nanjing 211198, China.

A novel octahydroindolizine alkaloid, named dendrocrepidamine () with an unusual 18,19,19'-cyclopropanone-dendrocrepine skeleton, was isolated from the ethanol extract of the roots of , along with six known compounds (-). The structure of was elucidated through HR-ESIMS, NMR spectroscopic data and computational calculations. All compounds were examined for their inhibitory effects on nitric oxide (NO) production induced by lipopolysaccharide (LPS) in RAW264. Read More

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Serum macrophage migration inhibitory factor as a potential biomarker to evaluate therapeutic response in patients with allergic asthma: an exploratory study.

J Zhejiang Univ Sci B 2021 Jun;22(6):512-520

Department of Pulmonary and Critical Care Medicine, First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China.

: Previous studies have shown that macrophage migration inhibitory factor (MIF) is involved in the pathogenesis of asthma. This study aimed to investigate whether serum MIF reflects a therapeutic response in allergic asthma. : We enrolled 30 asthmatic patients with mild-to-moderate exacerbations and 20 healthy controls, analyzing the parameter levels of serum MIF, serum total immunoglobulin E (tIgE), peripheral blood eosinophil percentage (EOS%), and fractional exhaled nitric oxide (FeNO). Read More

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Ultrafast Water Transport in Two-Dimensional Channels Enabled by Spherical Polyelectrolyte Brushes with Controllable Flexibility.

Angew Chem Int Ed Engl 2021 Jun 14. Epub 2021 Jun 14.

East China University of Science and Technology, School of Chemical Engineering, CHINA.

Fast water transport channels are crucial for water-related membrane separation processes. However, overcoming the trade-off between flux and selectivity is still a major challenge. To address this, we constructed spherical polyelectrolyte brush (SPB) structures with a highly hydrophilic polyelectrolyte brush layer, and introduced them into GO laminates, which increased both the flux and the separation factor. Read More

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Synthesis of SPIO Nanoparticles and the Subsequent Applications in Stem Cell Labeling for Parkinson's Disease.

Nanoscale Res Lett 2021 Jun 14;16(1):107. Epub 2021 Jun 14.

Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, No. 88 Keling Road, Suzhou New District, Suzhou, 215163, China.

Parkinson's disease (PD) is characterized by the progressive loss of dopaminergic neurons in the midbrain, and the stem cell transplantation method provides a promising strategy for the treatment. In these studies, tracking the biological behaviors of the transplanted cells in vivo is essential for a basic understanding of stem cell function and evaluation of clinical effectiveness. In the present study, we developed a novel ultrasmall superparamagnetic iron oxide nanoparticles coating with the polyacrylic acid (PAA) and methoxypolyethylene glycol amine (PEG) by thermal decomposition method and a two-step modification. Read More

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Preferential Oxycodone Loss of Physically Manipulated Abuse Deterrent Oxycodone HCl Extended Release Tablets Prepared for Nasal Insufflation Studies.

Pharm Res 2021 Jun 14. Epub 2021 Jun 14.

Department of Industrial and Physical Pharmacy, Purdue University, RHPH Building, RM 124, 575 Stadium Mall Dr, West Lafayette, Indiana, 47907, USA.

A method to reproducibly mill abuse deterrent oxycodone hydrochloride (HCl) extended release (ER) tablets was developed for a nasal insufflation pharmacokinetic (PK) study. Several comminution methods were explored before determining that a conical mill resulted in controlled milling of tablets to a size range equal to or below 1000 μm. However, milling resulted in significant loss of oxycodone from abuse deterrent oxycodone HCl ER tablets compared to minimal oxycodone loss from oxycodone HCl immediate release (IR) tablets. Read More

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Tumor microenvironment-triggered cancer vaccines inducing dual immunogenic cell death for elevated antitumor and antimetastatic therapy.

Nanoscale 2021 Jun 15. Epub 2021 Jun 15.

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China. and University of Science and Technology of China, Hefei, 230026, China.

Cancer vaccines are made from tumor-specific antigens, which are then injected back into the body to activate immune responses for cancer immunotherapy. Despite the high specificity and therapeutic efficiency, the vaccine has huge challenges such as complex preparation process, expensiveness and limited durational effects. Herein, a strategy to develop in situ cancer vaccines by enhancing the immunomodulatory effects for immunogenic cell death (ICD) is presented. Read More

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Dual sensitive and rapid detection of glycated human serum albumin using a versatile lead/graphene nanocomposite probe as a fluorescence-electrochemical aptasensor.

Analyst 2021 Jun 15. Epub 2021 Jun 15.

National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Thailand Science Park, Pathumthani, Thailand.

Monitoring of glycated human serum albumin (GHSA) as a glycemic marker for screening and monitoring of diabetes mellitus is widely practiced for patients with conditions that affect red blood cells. In this study, a complex comprising Pb ions adsorbed on graphene oxide (GO-Pb) was fabricated and utilized as a versatile probe in a fluorescence-electrochemical aptasensor for GHSA quantification. To simplify the aptasensor, the GO-Pb complex probe was prepared via an ion adsorption process. Read More

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Encapsulating bacteria in alginate-based electrospun nanofibers.

Biomater Sci 2021 Jun;9(12):4364-4373

Department of Chemical Engineering, University of Massachusetts, Amherst, Amherst, Massachusetts 01003-9303, USA.

Encapsulation technologies are imperative for the safe delivery of live bacteria into the gut where they regulate bodily functions and human health. In this study, we develop alginate-based nanofibers that could potentially serve as a biocompatible, edible probiotic delivery system. By systematically exploring the ratio of three components, the biopolymer alginate (SA), the carrier polymer poly(ethylene oxide) (PEO), and the FDA approved surfactant polysorbate 80 (PS80), the surface tension and conductivity of the precursor solutions were optimized to electrospin bead-free fibers with an average diameter of 167 ± 23 nm. Read More

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Activation of hypothalamic oxytocin neurons reduces binge-like alcohol drinking through signaling at central oxytocin receptors.

Neuropsychopharmacology 2021 Jun 14. Epub 2021 Jun 14.

Charleston Alcohol Research Center, Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, SC, USA.

Preclinical and clinical evidence suggests that exogenous administration of oxytocin (OT) may hold promise as a therapeutic strategy for reducing heavy alcohol drinking. However, it remains unknown whether these effects are mediated by stimulation of endogenous sources of OT and signaling at oxytocin receptors (OTR) in brain or in the periphery. To address this question, we employed a targeted chemogenetic approach to examine whether selective activation of OT-containing neurons in the paraventricular nucleus of the hypothalamus (PVN) alters alcohol consumption in a binge-like drinking ("Drinking-in-the-Dark"; DID) model. Read More

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Epitaxial lift-off of freestanding (011) and (111) SrRuO thin films using a water sacrificial layer.

Sci Rep 2021 Jun 14;11(1):12435. Epub 2021 Jun 14.

MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands.

Two-dimensional freestanding thin films of single crystalline oxide perovskites are expected to have great potential in integration of new features to the current Si-based technology. Here, we showed the ability to create freestanding single crystalline (011)- and (111)-oriented SrRuO thin films using SrAlO water-sacrificial layer. The epitaxial SrAlO(011) and SrAlO(111) layers were realized on SrTiO(011) and SrTiO(111), respectively. Read More

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Extraction of Preisach model parameters for fluorite-structure ferroelectrics and antiferroelectrics.

Sci Rep 2021 Jun 14;11(1):12474. Epub 2021 Jun 14.

Georgia Institute of Technology, School of Electrical and Computer Engineering, Atlanta, 30332, USA.

Flourite-structure ferroelectrics (FEs) and antiferroelectrics (AFEs) such as HfO and its variants have gained copious attention from the semiconductor community, because they enable complementary metal-oxide-semiconductor (CMOS)-compatible platforms for high-density, high-performance non-volatile and volatile memory technologies. While many individual experiments have been conducted to characterize and understand fluorite-structure FEs and AFEs, there has been little effort to aggregate the information needed to benchmark and provide insights into their properties. We present a fast and robust modeling framework that automatically fits the Preisach model to the experimental polarization ([Formula: see text]) versus electric field ([Formula: see text]) hysteresis characterizations of fluorite-structure FEs. Read More

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Design of metastable oxychalcogenide phases by topochemical (de)intercalation of sulfur in LaOS.

Nat Commun 2021 Jun 14;12(1):3605. Epub 2021 Jun 14.

Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN, Nantes, F-44000, France.

Designing and synthesising new metastable compounds is a major challenge of today's material science. While exploration of metastable oxides has seen decades-long advancement thanks to the topochemical deintercalation of oxygen as recently spotlighted with the discovery of nickelate superconductor, such unique synthetic pathway has not yet been found for chalcogenide compounds. Here we combine an original soft chemistry approach, structure prediction calculations and advanced electron microscopy techniques to demonstrate the topochemical deintercalation/reintercalation of sulfur in a layered oxychalcogenide leading to the design of novel metastable phases. Read More

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Pulmonary hypertension in interstitial lung disease: screening, diagnosis and treatment.

Curr Opin Pulm Med 2021 Jun 14. Epub 2021 Jun 14.

Department of Medicine V, University Hospital, LMU Munich and Lungenforschungsambulanz Helmholtz Zentrum Munich, Comprehensive Pneumology Center, Member of the German Center for Lung Research, Munich, Germany Advanced Lung Disease and Transplant Program, Inova Fairfax Hospital, Falls Church, Virginia, USA.

Purpose Of Review: Pulmonary vascular disease resulting in pulmonary hypertension in the context of interstitial lung disease (PH-ILD) is a common complication that presents many challenges in clinical practice. Despite recent advances, the pathogenetic interplay between parenchymal and vascular disease in ILD is not fully understood. This review provides an overview of the current knowledge and recent advances in the field. Read More

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Macula Densa NOS1β Modulates Renal Hemodynamics and Blood Pressure During Pregnancy: Role in Gestational Hypertension.

J Am Soc Nephrol 2021 Jun 14. Epub 2021 Jun 14.

R Liu, Department of Molecular Pharmacology & Physiology, University of South Florida College of Medicine, Tampa, United States

Regulation of renal hemodynamics and blood pressure (BP) via tubuloglomerular feedback (TGF) may be an important adaptive mechanism during pregnancy. Because the β-splice variant of nitric oxide synthase 1 (NOS1β) in the macula densa is a primary modulator of TGF, we evaluated its role in normal pregnancy and gestational hypertension in a mouse model. We hypothesized that pregnancy upregulates NOS1β in the macula densa, thus blunting TGF, allowing glomerular filtration rate (GFR) to increase and BP to decrease. Read More

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