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PubMed Journals Articles About "NAVIN FLUORINE" RSS

17:07 EDT 24th September 2018 | BioPortfolio

NAVIN FLUORINE PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest NAVIN FLUORINE articles that have been published worldwide.

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Showing "NAVIN FLUORINE" PubMed Articles 1–25 of 156

Supercritical temperature synthesis of fluorine-doped VO2(M) nanoparticle with improved thermochromic property.

Fluorine-doped VOsub>2</sub>(M) nanoparticles have been successfully synthesized using the hydrothermal method at a supercritical temperature of 490°C. The pristine VO<sub>2</sub>(M) has the critical phase transformation temperature of 64°C. The morphology and homogeneity of the monoclinic structure VO<sub>2</sub>(M) were adopted by the fluorine-doped system. The crystallinity and particle size were reduced the bigger the concentration of fluorine doping. The obtained part...


Transition Metal-Mediated and -Catalyzed C-F Bond Activation via Fluorine Elimination.

Activation of carbon-fluorine (C-F) bonds is an important topic in synthetic organic chemistry recently. Among the methods for C-F bond cleavage, metal mediated and catalyzed β- or α-fluorine elimination proceeds under mild conditions compared with oxidative addition of C-F bond. The β- or α-fluorine elimination is initiated from organometallic intermediates having fluorine substituents on carbon atoms β or α to metal centers, respectively. Transformations via these elimination processes (C-F bond cle...

Exploring atypical fluorine-hydrogen bonds and their effects on nucleoside conformations.

The ability of fluorine to serve as a hydrogen-bond acceptor has been debated for many years. Short fluorine-hydrogen contacts are thought to play a key role in stabilizing some complex supramolecular systems. To directly probe the existence of fluorine-hydrogen bonds, we have carried out NMR experiments and computational modeling studies in a series of C2'-fluorinated nucleosides. Specifically, quantum mechanics-molecular mechanics (QM/MM) analysis and [19F-1H]-HMBC NMR experiments provided direct evidence...


Fluorine walk: The impact of fluorine in quinolone amides on their activity against African sleeping sickness.

Human African Trypanosomiasis, also known as African sleeping sickness, is caused by the parasitic protozoa of the genus Trypanosoma. If there is no pharmacological intervention, the parasites can cross the blood-brain barrier (BBB), inevitably leading to death of the patients. Previous investigation identified the quinolone amide GHQ168 as a promising lead compound having a nanomolar activity against T. b. brucei. Here, the role of a fluorine substitution at different positions was investigated in regard ...

Comparison of SF₆ and CF₄ Plasma Treatment for Surface Hydrophobization of PET Polymer.

The fluorination of the polymer polyethylene terephthalate in plasma created from SF₆ or CF₄ gas at various pressures was investigated. The surface was analysed by X-ray photoelectron spectroscopy and water contact angle measurements, whereas the plasma was characterized by optical emission spectroscopy. The extent of the polymer surface fluorination was dependent on the pressure. Up to a threshold pressure, the amount of fluorine on the polymer surface and the surface hydrophobicity were similar, which...

MiR-132, miR-204 and BDNF-TrkB signaling pathway may be involved in spatial learning and memory impairment of the offspring rats caused by fluorine and aluminum exposure during the embryonic stage and into adulthood.

Fluorine and aluminium are nervous system poisons, but it remains unclear whether combined fluorine and aluminium exposure damages spatial learning and memory and, if so, by what mechanism. This study showed that exposure to fluorine and aluminium, either alone or combined, during the embryonic stage and into adulthood caused spatial learning and memory impairment in offspring rats; its mechanism may be associated with increases in miR-132 and miR-204 expression and downregulation of the BDNF-TrkB pathway i...

Radical Carbofluorination of Unactivated Alkenes with Fluoride Ion.

The copper-assisted radical carbofluorination of unactivated alkenes with fluoride ion is described. With [Cu(L3)F2]H2O (L3 = 4,4'-di(methoxycarbonyl)-2,2'-bipyridine) as the fluorine source and [Ag(DMPhen)(MeCN)]BF4 (DMPhen = 2,9-dimethyl-1,10-phenanthroline) as the chloride scavenger, the reaction of unactivated alkenes with CCl4 in acetonitrile provided the corresponding carbofluorination products in satisfactory yields. The protocol exhibited a wide functional group compatibility and broad substrate sco...

Improving metabolic stability of fluorine-18 labeled verapamil analogs.

Fluorine-18 labeled positron emission tomography (PET) tracers were developed to obtain more insight into the function of P-glycoprotein (P-gp) in relation to various conditions. They allow research in facilities without a cyclotron as they can be transported with a half-life of 110 min. As the metabolic stability of previously reported tracers [F]1 and [F]2 was poor, the purpose of this study was to improve this stability using deuterium substitution, creating verapamil analogs [F]1-d, [F]2-d, [F]3-d and...

The efficacy of fluorine-18-choline PET/CT in comparison with 99mTc-MIBI SPECT/CT in the localization of a hyperfunctioning parathyroid gland in primary hyperparathyroidism.

The aim of this study was to determine the role of fluorine-18-choline (F-FCH) PET/CT in comparison with technetium-99m-methoxyisobutylisonitrile (Tc-MIBI) single-photon emission computed tomography/computed tomography (SPECT/CT) in primary hyperparathyroidism and to investigate whether maximum standardized uptake value (SUVmax) may be indicative of disease severity.

Effect of Fluorinated Ligand on Structural, Electronic and DNA-binding Properties of Copper Paddlewheel Complex: Synthesis, Structure and Properties.

This paper presents synthesis, structural description and properties of a binuclear paddlewheel copper(II) carboxylate complex with formula [(py)Cu(μ-L)4Cu(py)], where py = pyridine and L = 4-fluorophenylacetate. Structural characteristics, electronic absorption and DNA-binding properties of the synthesized complex have been compared to those of the non-fluorinated analogues (where F is replaced by H, -CH3 and -OCH3) already reported and the modifications successfully ascribed to fluorine. The complex exhi...

Thermal Atomic Layer Etching of Silica and Alumina Thin Films Using Trimethylaluminum with Hydrogen Fluoride or Fluoroform.

Thermal atomic layer etching (ALE) is an emerging technique that involves the sequential removal of monolayers of a film by alternating self-limiting reactions, some of which generate volatile products. Although traditional ALE processes rely on the use of plasma, several thermal ALE processes have recently been developed using hydrogen fluoride (HF) with precursors such as trimethylaluminum (TMA) or tin acetylacetonate. While HF is currently the most effective reagent for ALE, its potential hazards and cor...

Taking advantage of hydrophobic fluorine interactions for self-assembled nanoclusters of quantum dots as delivery platform for enzymes.

Self-assembly of nanoparticles provides unique opportunities as nanoplatforms for controlled delivery. By exploiting the important role of non-covalent hydrophobic interactions in the engineering of stable assemblies, nanoclusters were formed by self-assembly of fluorinated quantum dots in aqueous medium through fluorine-fluorine interactions. These nanoclusters were able to encapsulate different enzymes (laccase and α-galactosidase) obtaining encapsulation efficiencies ≥ 74 %. Importantly, the encapsula...

Optimal timing of fluorine-18-fluoromisonidazole positron emission tomography/computed tomography for assessment of tumor hypoxia in patients with head and neck squamous cell carcinoma.

The aim of this study was to identify the optimal timing of fluorine-18-fluoromisonidazole (F-MISO) PET/CT imaging to assess hypoxia in patients with head and neck squamous cell carcinoma.

Over 14% Efficiency in Polymer Solar Cells Enabled by a Chlorinated Polymer Donor.

Fluorine-contained polymers, which have been widely used in highly efficient polymer solar cells (PSCs), are rather costly due to their complicated synthesis and low yields in the preparation of components. Here, the feasibility of replacing the critical fluorine substituents in high-performance photovoltaic polymer donors with chlorine is demonstrated, and two polymeric donors, PBDB-T-2F and PBDB-T-2Cl, are synthesized and compared in parallel. The synthesis of PBDB-T-2Cl is much simpler than that of PBDB-...

Rational design of low cost and high energy lithium batteries through tailored fluorine-free electrolyte and nanostructured sulfur/carbon composite.

We report a new lithium/sulfur cell concept based on an optimized fluorine-free catholyte solution and a high loading nanostructured carbon/sulfur composite cathode. The Li2S8 present in the electrolyte ensures both buffering against active material dissolution and Li+ conduction. The high sulfur loading is obtained by confining elemental sulfur (~80%) in the mesopores of a highly ordered CMK3 carbon. With this concept we demonstrate stabilization of high energy density and excellent cycling performance ove...

Photoelectrocatalytic degradation of atrazine by boron-fluorine co-doped TiO nanotube arrays.

Atrazine, one of the most widespread herbicides in the world, is considered as an environmental estrogen and has potential carcinogenicity. In this study, atrazine was degraded on boron-fluorine co-doped TiO nanotube arrays (B, F-TiO NTAs), which had similar morphology with the pristine TiO NTAs. The structure and morphology of TiO nanotube samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV-visible diffuse reflectance spectroscopy (DRS). It showed that the deco...

Diagnostic value of fluorine-18 deoxyglucose positron emission tomography/computed tomography in deep sternal wound infection.

Deep sternal wound infection (DSWI) is a refractory complication after heart surgery, and debridement is the first-line treatment. The accurate identification of the extent of the infection is the key to successful debridement. The present study assessed the diagnostic accuracy of fluorine-18 deoxyglucose (F-FDG) positron emission tomography/computed tomography (PET/CT) for identifying the infected area of DSWI.

Relationship of Water Content With Silicon and Fluorine Contents of Silicone-Hydrogel Contact Lens Materials.

The relationship between water (W) content and silicon (Si) content of silicone-hydrogel (SiHy) contact lens materials was inspected using identical methodologies, equipment, and operators for materials composing 16 types of commercially available SiHy contact lenses. Fluorine (F) content was included in the analysis for the three materials also containing a fluoropolymer. One type of lens consisted of a bulk SiHy material coated with thin layers of conventional hydrogel.

AgFeOF: A Fluorine-Rich Perovskite Oxyfluoride.

We synthesized a silver iron oxyfluoride AgFeOF by using a high-pressure reaction. Synchrotron X-ray and neutron diffraction, X-ray absorption, and Fe Mössbauer spectroscopy indicate that AgFeOF crystallizes in the ideal perovskite structure with iron in a trivalent state, although electron microscopy revealed weak super-reflections. A possible partial ordering in the FeOF octahedron is inferred from Mössbauer spectroscopy. The synthesis of the fluorine-rich sample offers an opportunity to study a composi...

One-pot synthesis and biodistribution of fluorine-18 labeled serum albumin for vascular imaging.

Equilibrium single-photon radionuclide imaging methods for assessing cardiac function and the integrity of the vascular system have long been in use for both clinical and research purposes. However, positron-emitting blood pool agents that could provide PET equivalents to these (and other) clinical procedures have not yet been adopted despite technical imaging advantages offered by PET. Our goal was to develop a PET blood pool tracer that not only meets necessary in vivo biological requirements but can be p...

Fluorine-free Water-in-Salt Electrolyte for Green and Low-cost Aqueous Sodium-Ion Batteries.

The highly concentrated "Water-in-Salt" electrolyte (WiSE) containing sodium acetate and potassium acetate demonstrates peculiar performance (specific capacity of 37 mAh g-1 at 5th cycle and average discharge voltage of 0.82 V) in aqueous sodium-ion batteries (SIBs) based on Na2MnFe(CN)6 and NaTi2(PO4)3. The fluorine-free electrolyte offers wide electrochemical stability window and compatibility with Al current collector. The electrolyte, current collector and the electrode materials based on abundant eleme...

Catalyzed and Promoted Aliphatic Fluorination.

In last six years, the direct functionalization of aliphatic C-H (and C-C) bonds through user-friendly, radical-based fluorination reactions has emerged as an exciting research area in fluorine chemistry. Considering the historical narratives about the challenges of developing practical radical fluorination in organic frameworks, notable advancements in controlling both reactivity and selectivity have been achieved during this time. As one of the participants in the field, herein, we a provide brief account...

Metal-free Fluorine Interlayer Doped Carbon Electrocatalyst for CO₂ Reduction Outcompeting Hydrogen Evolution.

Electrochemical carbon dioxide reduction (ECDRR), as a key reaction in artificial photosynthesis to implement renewable energy conversion/storage, has been inhibited by the low efficiency and high cost of electrocatalysts. Herein, we synthesize a fluorine interlayer doped carbon (FC) catalyst which enables the highly selective CO₂-to-CO conversion with enhanced partial current density of CO (ca. 250,000 times) and suppressed H₂ (ca. 1/5) on FC than pristine carbon. Concluded from experimental analysis a...

Photochemical Synthesis and Electronic Properties of Extended Corannulenes with Variable Fluorination Pattern.

The first family of extended and fluorinated corannulenes is prepared through a highly efficient and modular synthetic strategy. In this strategy, corannulene aldehyde could be combined with the fluorine-carrying phosphonium ylides to furnish stilbene-like vinylene precursors. A photochemically induced oxidative cyclization process of these precursors gives rise to the fluorinated and curved polycyclic aromatic hydrocarbons. A UV-vis absorption study shows that aromatic extension results in a bathochromic s...

Dual-Energy Computed Tomography-Based Iodine Quantitation for Response Evaluation of Lung Cancers to Chemoradiotherapy/Radiotherapy: A Comparison With Fluorine-18 Fluorodeoxyglucose Positron Emission Tomography/Computed Tomography-Based Positron Emission Tomography/Computed Tomography Response Evaluation Criterion in Solid Tumors.

The objective of this study was to investigate the correlation between dual-energy computed tomography (DECT)-based iodine quantitation and fluorine-18 fluorodeoxyglucose (F-FDG) positron emission tomography (PET)/computed tomography (CT) imaging for response evaluation of lung cancers to treatment.


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