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https://www.readbyqxmd.com/read/29331911/enhanced-photocatalytic-degradation-of-sulfamethoxazole-by-zinc-oxide-photocatalyst-in-the-presence-of-fluoride-ions-optimization-of-parameters-and-toxicological-evaluation
#1
Amir Mirzaei, Laleh Yerushalmi, Zhi Chen, Fariborz Haghighat, Jianbo Guo
The presence of antibiotics in water bodies has received increasing attention since they are continuously introduced and detected in the environment and may cause unpredictable environmental hazards and risks. The photocatalytic degradation of sulfamethoxazole (SMX) by ZnO in the presence of fluoride ions (F-ZnO) was evaluated. The effects of operating parameters on the efficiency of SMX removal were investigated by using response surface methodology (RSM). Under the optimum condition, i.e. photocatalyst dosage = 1...
January 11, 2018: Water Research
https://www.readbyqxmd.com/read/29331812/evidence-of-c-f-p-and-aromatic-%C3%AF-f-p-weak-interactions-in-imidazolium-ionic-liquids-and-its-consequences
#2
Sumit Kumar Panja, Nitin Srivastava, Jyoti Srivastava, Namburi Eswara Prasad, Hemanth Noothalapati, Shinsuke Shigeto, Satyen Saha
A simple change from alkyl group to alkene in side chain of imidazolium cation with same anion resulted in a drastic impact on physical properties (e.g., melting point) from bmimPF6 IL to cmimPF6 IL. The underlying reasons have been elucidated by structural and interaction studies with the help of DSC, SCXRD, vibrational and multi-nuclear NMR spectroscopic techniques. Experiments reveal existence of new weak interactions involving the carbon and π cloud of the imidazolium aromatic ring with fluoride of PF6 anion (i...
December 19, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29331777/comparing-the-antifouling-effects-of-activated-carbon-and-tio2-in-ultrafiltration-membrane-development
#3
Qianyu Liu, Shaobin Huang, Yongqing Zhang, Shuaifei Zhao
We use activated carbon (AC) and titanium oxide (TiO2) nanomaterials as the additives to prepare four polyvinylidene fluoride (PVDF) based ultrafiltration membranes by nonsolvent induced phase separation. The surface properties (pore size, porosity, hydrophilicity and roughness) of the membranes are characterized by scanning electron microscopy, water contact angle measurement, and atomic force microscopy. The chemical properties of the membranes are evaluated by Fourier transform infrared spectroscopy with attenuated total reflection and X-ray diffraction...
January 6, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29330841/delayed-replantation-of-an-avulsed-immature-permanent-incisor-and-apexification-using-a-novel-fast-setting-calcium-silicate-cement-containing-fluoride-a-3-year-follow-up-case-report
#4
A Vafaei, B Ranjkesh, L Erfanparast, H Løvschall
BACKGROUND: Traumatic tooth avulsion requires an urgent intervention to replant the tooth. Prolonged post-injury dry extra-oral conditions worsen the prognosis and increase the risk of root resorption. Fluoride has the potential to delay replacement resorption. Calcium silicate cements (CSC) are used to seal the root canal system and to stimulate periapical regeneration in immature open apex teeth (apexification). This report suggests the application of a novel fast-setting CSC with fluoride for apexification in an attempt to hinder root resorption...
January 12, 2018: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/29329495/organometallic-mediated-radical-polymerization-of-vinylidene-fluoride
#5
Bruno Michel Ameduri, Rinaldo Poli, Vincent Ladmiral, Sanjib Banerjee, Antoine Debuigne, Christophe Detrembleur
An unprecedented level of control for the radical polymerization of vinylidene fluoride (VDF), yielding well-defined PVDF (at least up to 14,500 g/mol) with low dispersity (≤1.32), was achieved using organometallic mediated radical polymerization (OMRP) with an organocobalt compound as initiator. The high chain-end fidelity was demonstrated by the synthesis of PVDF- and PVAc-containing di-and tri-block copolymers. DFT calculations rationalize the equally efficient reactivation of the dormant species with both head and tail chain ends...
January 12, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29329443/bone-formation-in-ankylosing-spondylitis-during-anti-tumour-necrosis-factor-therapy-imaged-by-18f-fluoride-positron-emission-tomography
#6
Stefan T G Bruijnen, Nicki J F Verweij, Leonie M van Duivenvoorden, Nathalie Bravenboer, Dominique L P Baeten, Christiaan J van Denderen, Irene E van der Horst-Bruinsma, Alexandre E Voskuyl, Martijn Custers, Peter M van de Ven, Joost C J Bot, Bouke J H Boden, Adriaan A Lammertsma, Otto S H Hoekstra, Pieter G H M Raijmakers, Conny J van der Laken
Objectives: Excessive bone formation is an important hallmark of AS. Recently it has been demonstrated that axial bony lesions in AS patients can be visualized using 18F-fluoride PET-CT. The aim of this study was to assess whether 18F-fluoride uptake in clinically active AS patients is related to focal bone formation in spine biopsies and is sensitive to change during anti-TNF treatment. Methods: Twelve anti-TNF-naïve AS patients [female 7/12; age 39 years (SD 11); BASDAI 5...
January 9, 2018: Rheumatology
https://www.readbyqxmd.com/read/29328264/mid-infrared-supercontinuum-generation-from-1-6-to-11%C3%A2-%C3%A2-%C3%AE-m-using-concatenated-step-index-fluoride-and-chalcogenide-fibers
#7
Ramon A Martinez, Genevieve Plant, Kaiwen Guo, Brian Janiszewski, Michael J Freeman, Robert L Maynard, Mohammed N Islam, Fred L Terry, Oseas Alvarez, Francois Chenard, Robert Bedford, Ricky Gibson, Agustin I Ifarraguerri
We demonstrate an all-fiber supercontinuum source that generates a continuous spectrum from 1.6 μm to >11  μm with 417 mW on-time average power at 33% duty cycle. By utilizing a master oscillator power amplifier pump with three amplification stages and concatenating solid core ZBLAN, arsenic sulfide, and arsenic selenide fibers, we shift 1550 nm light to ∼4.5  μm, ∼6.5  μm, and >11  μm, respectively. With 69 mW past 7.5 μm, this source provides both high power and broad spectral expansion, while outputting a single fundamental mode...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328238/2%C3%A2-%C3%A2-%C3%AE-m-doppler-wind-lidar-with-a-tm-fiber-laser-pumped-ho-ylf-laser
#8
Kohei Mizutani, Shoken Ishii, Makoto Aoki, Hironori Iwai, Ryohei Otsuka, Hirotake Fukuoka, Takayoshi Isikawa, Atsushi Sato
A 2 μm Ho-doped ytrrium lithium fluoride (Ho:YLF) laser end-pumped by a 1.94 μm Tm:fiber laser was developed. A laser system of a ring resonator oscillator and amplifier was operated at repetition rates of 200-5000 Hz at room temperature. The Q-switched outputs were 7.4 W at 5000 Hz and 4.25 W at 200 Hz. Injection seeding was applied to the ring resonator, and single-mode laser emission was obtained. The Tm:fiber-laser-pumped Ho:YLF laser was first used for Doppler wind lidar measurements, and wind profiles were obtained up to ranges of about 15 km in a range resolution of 96 m and an integration time of 1 s...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328167/high-speed-real-time-heterodyne-interferometry-using-software-defined-radio
#9
L M Riobo, F E Veiras, M G Gonzalez, M T Garea, P A Sorichetti
This paper describes the design and performance of a phase demodulation scheme based on software-defined radio (SDR), applied in heterodyne interferometry. The phase retrieval is performed in real time by means of a low-cost SDR with a wideband optoelectronic front-end. Compared to other demodulation schemes, the system is quite simpler, versatile, and of lower cost. The performance of the demodulator is demonstrated by measuring the displacement per volt of a thin-film polymeric piezoelectric transducer based on polyvinylidene fluoride for ultrasonic applications...
January 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29327935/introduction-of-a-crystalline-shelf-stable-reagent-for-the-synthesis-of-sulfur-vi-fluorides
#10
Hua Zhou, Paramita Mukherjee, Rongqiang Liu, Edelweiss Evrard, Dianpeng Wang, John M Humphrey, Todd W Butler, Lise R Hoth, Jeffrey B Sperry, Sylvie K Sakata, Christopher J Helal, Christopher W Am Ende
The design, synthesis, and application of [4-(acetylamino)phenyl]imidodisulfuryl difluoride (AISF), a shelf-stable, crystalline reagent for the synthesis of sulfur(VI) fluorides, is described. The utility of AISF is demonstrated in the synthesis of a diverse array of aryl fluorosulfates and sulfamoyl fluorides under mild conditions. Additionally, a single-step preparation of AISF was developed that installed the bis(fluorosulfonyl)imide group on acetanilide utilizing an oxidative C-H functionalization protocol...
January 12, 2018: Organic Letters
https://www.readbyqxmd.com/read/29327019/using-a-novel-rigid-fluoride-polymer-to-control-the-interfacial-thickness-of-graphene-and-tailor-the-dielectric-behavior-of-poly-vinylidene-fluoride-trifluoroethylene-chlorotrifluoroethylene-nanocomposites
#11
Xianghui Han, Sheng Chen, Xuguang Lv, Hang Luo, Dou Zhang, Chris R Bowen
Polymer nanocomposites based on conductive fillers for high performance dielectrics have attracted increasing attention in recent years. However, a number of physical issues are unclear, such as the effect of interfacial thickness on the dielectric properties of the polymer nanocomposites, which limits the enhancement of permittivity. In this research, two core-shell structured reduced graphene oxide (rGO)@rigid-fluoro-polymer conducting fillers with different shell thicknesses are prepared using a surface-initiated reversible-addition-fragmentation chain transfer polymerization method, which are denoted as rGO@PTFMS-1 with a thin shell and rGO@PTFMS-2 with a thick shell...
January 12, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29326518/toothpaste-use-protocol-with-dental-bleaching-for-a-conservative-treatment-case-reports
#12
Waldemir F Vieira-Junior, Thayla H N Gouveia, Bruna G Silva, Vanessa C P S Bueno, Flávio H B Aguiar, Débora A N L Lima
In-office bleaching is a treatment based on products that contain hydrogen peroxide (HP) while demonstrating whitening effectiveness. HP could promote alterations to surface morphologies and properties of dental tissues. The objective was describe a toothpaste protocol associated to bleaching therapy to promote a safer approach. Patient 1 (male) and Patient 2 (female) were attended, and toothbrushing (twice a day) with a dentifrice containing bioactive glass (BG) (NovaMin™) and fluoride was indicated before and during the treatment...
October 2017: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/29326466/a-study-of-oral-health-prevention-behaviours-for-patients-with-early-stage-dementia
#13
R Emanuel, A Sorensen
Background Thorough dental prevention provided at the diagnosis of early stage dementia may be able to reduce the risk of dental disease before the associated cognitive decline takes hold.Method A questionnaire was used to see how many patients with a recent diagnosis of dementia were registered with a dentist and if they were accessing preventative dental care. The questionnaire was administered to patients attending Memory Assessment Services (MAS), approximately ten weeks after initial diagnosis. A similar questionnaire was conducted among MAS staff providing insight into their own personal dental care knowledge and behaviours...
January 12, 2018: British Dental Journal
https://www.readbyqxmd.com/read/29323900/enantioselective-1-2-anionotropic-rearrangement-of-acylsilane-through-bisguanidinium-silicate-ion-pair
#14
Weidi Cao, Davin Tan, Richmond Lee, Choon-Hong Tan
Highly enantioselective bisguanidinium-catalyzed tandem rearrangements of acylsilanes are reported. The acylsilanes were activated via an addition of fluoride on the silicon to form a penta-coordinate anionic silicate intermediate. The silicate then underwent alkyl or aryl group migration from the silicon atom to the neighboring carbonyl carbon atom (1,2-anionotropic rearrangement), followed by [1,2]-Brook rearrangement to provide the secondary alcohols in high yields with excellent enantioselectivities (up to 95% ee)...
January 11, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29323457/impact-of-subchronic-exposure-to-triclosan-and-or-fluoride-on-estrogenic-activity-in-immature-female-rats-the-expression-pattern-of-calbindin-d9k-and-estrogen-receptor-%C3%AE-genes
#15
Yasmina M Abd-Elhakim, Amany T Mohammed, Haytham A Ali
This study explored the influence of triclosan (TCS) in the absence and presence of sodium fluoride (NaF) on estrogenic activity and thyroid function of adolescent female rats. The results indicated that the individual exposure to TCS evoked a significant decline in T3 and T4 but the levels of estradiol, FSH, and LH were significantly elevated beside marked up regulation of calbindin-D9k and estrogen α mRNA expression. On the other hand, the single exposure to NaF causes insignificant changes in thyroid hormones, but evoked a trend toward an increase in both estradiol and LH levels...
January 11, 2018: Journal of Biochemical and Molecular Toxicology
https://www.readbyqxmd.com/read/29322852/anion-inhibition-studies-of-a-beta-carbonic-anhydrase-from-the-malaria-mosquito-anopheles-gambiae
#16
Daniela Vullo, Leo Syrjänen, Marianne Kuuslahti, Seppo Parkkila, Claudiu T Supuran
An anion inhibition study of the β-class carbonic anhydrase, AgaCA, from the malaria mosquito Anopheles gambiae is reported. A series of simple as well as complex inorganic anions, and small molecules known to interact with CAs were included in the study. Bromide, iodide, bisulphite, perchlorate, perrhenate, perruthenate, and peroxydisulphate were ineffective AgaCA inhibitors, with KIs > 200 mM. Fluoride, chloride, cyanate, thiocyanate, cyanide, bicarbonate, carbonate, nitrite, nitrate, sulphate, stannate, selenate, tellurate, diphosphate, divanadate, tetraborate, selenocyanide, and trithiocarbonate showed KIs in the range of 1...
December 2018: Journal of Enzyme Inhibition and Medicinal Chemistry
https://www.readbyqxmd.com/read/29322781/ab-initio-study-predicts-that-enigmatic-isonitrosyl-fluoride-should-be-stable-at-low-temperatures-yet-unnoticeable-due-to-its-photoreactivity
#17
Raulia R Syrlybaeva, Marat R Talipov
Isonitrosyl fluoride F-ON remains an undetected molecule despite multiple attempts to generate it and successful identification of other isonitrosyl halides (X-ONs) via photo-transformations of corresponding X-NOs. We investigated this problem using ab initio methods and found no evidence of instability of F-ON at low temperatures of 8-10 K. Instead, experimental observation of F-ON is likely challenged by the (1) different nature of photoexcitation of F-NO and its lower quantum yield than in other X-NOs, and (2) presence of a bright charge-transfer transition in the F-ON spectrum that likely overlaps with the weak band of F-NO used for photoexcitation...
January 11, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29322568/energy-transfer-in-supramolecular-heteronuclear-lanthanide-dimers-and-application-to-fluoride-sensing-in-water
#18
Loic Charbonnière, Aline Nonat, Tao Liu, Franck Camerel, Olivier Jeannin
In the presence of fluoride anions, the [LnL(H2O)]+ complexes, based on the coordination of a lanthanide (Ln) cation into the cavity of a C2v symmetrical cyclen based ligand L, self-assemble in water to form [(LnL)2F]+ dimers. The crystal structures of the Yb hydrated monomer and of the fluorinated dimer are reported and analyzed to unravel the impact of the cumulative effect of weak hydrogen bonding and aromatic stacking interactions in the supramolecular assembly. The assembly is stable over a broad range of pH (3 to 8)...
January 11, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29321214/18f-flurodeoxyglucose-and-18f-sodium-fluoride-positron-emission-tomography-computed-tomography-imaging-of-arterial-and-cutaneous-alterations-in-pseudoxanthoma-elasticum
#19
Pierre-Jean Mention, Franck Lacoeuille, Georges Leftheriotis, Ludovic Martin, Loukman Omarjee
No abstract text is available yet for this article.
January 2018: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29320886/contribution-of-preventive-methods-in-controlling-caries-among-saudi-primary-schoolchildren-a-population-based-cross-sectional-study
#20
Jehan AlHumaid, Zainah Salloot, Asim Al-Ansari, Maha El Tantawi, Yousef AlYousef, Fahad Al-Harbi
OBJECTIVE: This study assessed the association between caries preventive measures including regular dental checkups, twice a day tooth brushing using fluoridated toothpaste and pit and fissure sealants on one side and the presence of caries among primary schoolchildren in the Eastern Province of Saudi Arabia. MATERIALS AND METHODS: A cross-sectional study was conducted in 2016 including 1198, 6-12-year-old children from 13 randomly selected schools. The outcome variable was caries presence...
January 11, 2018: Acta Odontologica Scandinavica
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