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https://www.readbyqxmd.com/read/28723715/novel-weight-based-dose-threshold-for-18f-naf-pet-ct-imaging-using-advanced-pet-ct-systems-a-potential-tool-for-reducing-radiation-burden
#1
Fahad Marafi, Abdulreda Esmail, Rashid Rasheed, Fareeda Alkandari, Sharjeel Usmani
BACKGROUND: Fluorine-18-sodium fluoride (F-NaF) PET/CT is an important tool for detecting and evaluating metastatic bone cancer. Besides traditional dose metrics, recent methods such as real-time dose mapping, dose calculation from DICOM information, and their relevance to entrance skin exposure are currently in use to reduce the radiation burden. In this study, we have analyzed the data of 1062 patients retrospectively to evaluate patterns of absorbed dose for institutional weight-based dose protocol as compared with fixed dose method guidelines of Society of Nuclear Medicine and Molecular Imaging (SNMMI)...
July 18, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28723150/double-imaging-photoelectron-photoion-coincidence-sheds-new-light-on-the-dissociation-of-state-selected-ch3f-ions
#2
Xiaofeng Tang, Gustavo A Garcia, Laurent Nahon
The vacuum ultraviolet (VUV) photoionization and dissociative photoionization of methyl fluoride (CH3F) in the 12.2-19.8 eV energy range were investigated by using synchrotron radiation coupled to a double imaging photoelectron photoion coincidence (i(2)PEPICO) spectrometer. The production of several fragment ions including CH2F(+), CHF(+), CH3(+) and CH2(+) as a function of state and internal energy of CH3F(+) ions was identified and analyzed, with their individual appearance energies measured through threshold photoelectron spectroscopy...
July 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28721720/multicolor-tunable-luminescence-based-on-tb-3-eu-3-doping-through-a-facile-hydrothermal-route
#3
Chao Wang, Ting Zhou, Jing Jiang, Huiyuan Geng, Zhanglei Ning, Xin Lai, Jian Bi, Daojiang Gao
Ln(3+)-doped fluoride is a far efficient material for realizing multicolor emission, which plays an important part in full-color displays, biolabeling and MRI. However, studies on the multicolor tuning properties of Ln(3+)-doped fluoride are mainly concentrated on a complicated process using three or more dopants and the principle of energy transfer mechanism is still unclear. Herein, multicolor tunable emission is successfully obtained only by co-doping with Tb(3+) and Eu(3+) ions in β-NaGdF4 submicrocrystals via a facile hydrothermal route...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28720466/antinociceptive-effects-of-huf-101-a-fluorinated-cannabidiol-derivative
#4
Nicole R Silva, Felipe V Gomes, Miriam D Fonseca, Raphael Mechoulam, Aviva Breuer, Thiago M Cunha, Francisco S Guimarães
Cannabidiol (CBD) is a phytocannabinoid with multiple pharmacological effects and several potential therapeutic properties. Its low oral bioavailability, however, can limit its clinical use. Preliminary results indicate that fluorination of the CBD molecule increases its pharmacological potency. Here, we investigated whether HUF-101 (3, 10, and 30mg/kg), a fluorinated CBD analogue, would induce antinociceptive effects. HUF-101 effects were compared to those induced by CBD (10, 30, and 90mg/kg) and the cannabinoid CB1/2 receptor agonist WIN55,212-2 (1, 3, and 5mg/kg)...
July 15, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28719878/the-effects-of-fluoride-on-neuronal-function-occurs-via-cytoskeleton-damage-and-decreased-signal-transmission
#5
Lingli Chen, Hongmei Ning, Zhihong Yin, Xiaochao Song, Yongchao Feng, Hao Qin, Yi Li, Jundong Wang, Yaming Ge, Wenkui Wang
It has been reported that fluoride exposure may cause serious public health problems, particularly neurotoxicity. However, the underlying mechanisms remain unclear. This study used Neuro-2A cells to investigate the effects of fluoride on the cytoskeleton. The Neuro-2A cells were exposed to 0, 1, 2, 4 and 6 mM sodium fluoride (NaF) for 24 h. Cell viability and lactate dehydrogenase (LDH) release were examined. It was observed that exposure to NaF reduced cell viability, disrupted cellular membrane integrity, and high levels of LDH were released...
June 30, 2017: Chemosphere
https://www.readbyqxmd.com/read/28719589/an-excited-state-underlies-gene-regulation-of-a-transcriptional-riboswitch
#6
Bo Zhao, Sharon L Guffy, Benfeard Williams, Qi Zhang
Riboswitches control gene expression through ligand-dependent structural rearrangements of the sensing aptamer domain. However, we found that the Bacillus cereus fluoride riboswitch aptamer adopts identical tertiary structures in solution with and without ligand. Using chemical-exchange saturation transfer (CEST) NMR spectroscopy, we revealed that the structured ligand-free aptamer transiently accesses a low-populated (∼1%) and short-lived (∼3 ms) excited conformational state that unravels a conserved 'linchpin' base pair to signal transcription termination...
July 17, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28719447/diffuse-increased-sodium-fluoride-gastric-activity-in-a-patient-with-hypercalcemia
#7
Fuqiang Shao, Shumao Zhang, Chi Qi, Yu Wang, Yue Chen
Increased extraosseous uptake of sodium fluoride can be visualized because of many different etiologies. A 62-year-old man with a history of osteoporosis had an F-sodium fluoride PET/CT scan for accessing chest pain caused by an accident. The images showed multiple fractures. Unexpectedly, diffuse activity was noted in the gastric wall, which was suggestive of possible hypercalcemia. The serum calcium level confirmed the patient had hypercalcemia.
July 17, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28718624/covalent-enzyme-inhibition-through-fluorosulfate-modification-of-a-non-catalytic-serine-residue
#8
Olugbeminiyi O Fadeyi, Lise R Hoth, Chulho Choi, Xidong Feng, Ariamala Gopalsamy, Erik C Hett, Robert E Kyne, Ralph P Robinson, Lyn H Jones
Irreversible enzyme inhibitors often utilize the reaction of a protein cysteine residue with an appropriately positioned electrophile (an acrylamide for example) in the ligand template. Cysteine residues are not always available for site-specific protein labeling and therefore new approaches are needed to expand the toolkit of appropriate electrophiles that target alternative amino acids. We have previously described the rational targeting of tyrosine residues in the active site of a protein (the mRNA decapping scavenger enzyme, DcpS) using inhibitors armed with sulfonyl fluoride electrophiles that additionally enabled the subsequent development of clickable probe technology to measure drug-target occupancy in live cells...
July 18, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28717213/ferroelectric-paraelectric-transition-in-a-membrane-with-quenched-induced-%C3%AE-phase-of-pvdf
#9
O García-Zaldívar, T Escamilla-Díaz, M Ramírez-Cardona, M A Hernández-Landaverde, R Ramírez-Bon, J M Yañez-Limón, F Calderón-Piñar
The stabilization of δ-phase of poly(vinylidene fluoride) PVDF in a 14 µm-thickness ferroelectric membrane is achieved by a simple route based on the use of a dimethylformamide (DMF)/acetone solvent, in which the application of external electric field is not required. X-ray diffraction and calorimetric experiments on heating reveal that, at 154 °C, the original mixture between ferroelectric δ-phase and paraelectric α-phase transits to a system with only this latter phase in the crystalline fraction. A gradual and slight increment of amorphous fraction up to the melting at 161 °C is also observed...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28715617/ionophore-based-anion-selective-optode-printed-on-cellulose-paper
#10
Xuewei Wang, Qi Zhang, Changwoo Nam, Michael Hickner, Mollie Mahoney, Mark Meyerhoff
We report a general anion sensing platform based on a portable and cost-effective ion-selective optode and a smartphone detector equipped with a color analysis app. In contrast to traditional anion-selective optodes using a hydrophobic polymer and/or plasticizer to dissolve hydrophobic sensing elements, the new optode relies on hydrophilic cellulose paper. The anion ionophore and a lipophilic pH indicator are inkjet-printed and adsorbed on paper and form a "dry" hydrophobic sensing layer. Porous cellulose sheets also allow the sensing site to be modified with dried buffer that prevents any sample pH dependence of the observed color change...
July 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28714552/annulated-1-3-4-azadiphospholides-heterocycles-with-widely-tunable-optical-properties
#11
Hansjörg Grützmacher, Riccardo Suter, Zoltán Benkö, Mark Bispinghoff
Phosphorus heterocycles find applications in the synthesis of π-conjugated compounds and as precursors for optoelectronic materials such as organic light emitting diodes (OLEDs), electronic switches, and transistors. We report a high yield, one pot synthesis of anionic annulated 1,3,4-azadiphospholides from Na(OCP) and 2-chloro pyridines. The synthesis proceeds without the use of transition metals and tolerates a wide range of substrates. Cyano-substituted compounds are especially deeply colored and have absorption maxima which range from λmax = 525 to 596 nm...
July 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28713433/black-tea-source-production-and-consumption-assessment-of-health-risks-of-fluoride-intake-in-new-zealand
#12
Declan T Waugh, Michael Godfrey, Hardy Limeback, William Potter
In countries with fluoridation of public water, it is imperative to determine other dietary sources of fluoride intake to reduce the public health risk of chronic exposure. New Zealand has one of the highest per capita consumption rates of black tea internationally and is one of the few countries to artificially fluoridate public water; yet no information is available to consumers on the fluoride levels in tea products. In this study, we determined the contribution of black tea as a source of dietary fluoride intake by measuring the fluoride content in 18 brands of commercially available products in New Zealand...
2017: Journal of Environmental and Public Health
https://www.readbyqxmd.com/read/28713112/effect-of-casein-phosphopeptide-amorphous-calcium-phosphate-and-three-calcium-phosphate-on-enamel-microhardness
#13
En Hr Haghgou, Roza Haghgoo, Mohamad R Roholahi, Zahra Ghorbani
AIM: This study aims to investigate the effect of casein phos-phopeptide-amorphous calcium phosphate and three calcium phosphate (CPP-ACP and TCP) on increasing the microhardness of human enamel after induction of erosion. MATERIALS AND METHODS: A total of 26 healthy human-impacted third molar teeth were chosen, and their hardness measured using a microhardness testing machine. The samples were immersed in Coca Cola (pH = 4.7) for 8 minutes. Then, micro-hardness was measured again, and these samples were randomly divided into four groups (two control groups and two experimental groups)...
July 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28708587/sodium-fluoride-induces-renal-inflammatory-responses-by-activating-nf-%C3%AE%C2%BAb-signaling-pathway-and-reducing-anti-inflammatory-cytokine-expression-in-mice
#14
Qin Luo, Hengmin Cui, Huidan Deng, Ping Kuang, Huan Liu, Yujiao Lu, Jing Fang, Zhicai Zuo, Junliang Deng, Yinglun Li, Xun Wang, Ling Zhao
Fluoride is widely distributed in the environment and often results in adverse health effects on animals and human beings. It has been proved that fluoride can induce inflammatory responses in vitro. However, very limited reports are focused on fluoride-induced inflammatory responses in vivo. In this study, mice were used to investigate sodium fluoride (NaF) induced renal inflammatory responses and the potential mechanism by using the methods of pathology, biochemistry, enzyme-linked immunosorbent assay (ELISA), quantitative real-time polymerase chain reaction (qRT-PCR) and western blot...
July 5, 2017: Oncotarget
https://www.readbyqxmd.com/read/28708079/comparison-of-erosion-behavior-and-particle-contamination-in-mass-production-cf%C3%A2-o%C3%A2-plasma-chambers-using-y%C3%A2-o%C3%A2-and-yf%C3%A2-protective-coatings
#15
Tzu-Ken Lin, Wei-Kai Wang, Shih-Yung Huang, Chi-Tsung Tasi, Dong-Sing Wuu
Yttrium fluoride (YF₃) and yttrium oxide (Y₂O₃) protective coatings prepared using an atmospheric plasma spraying technique were used to investigate the relationship between surface erosion behaviors and their nanoparticle generation under high-density plasma (10(12)-10(13) cm(-3)) etching. As examined by transmission electron microscopy, the Y₂O₃ and YF₃ coatings become oxyfluorinated after exposure to the plasma, wherein the yttrium oxyfluoride film formation was observed on the surface with a thickness of 5...
July 14, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28707766/fe-containing-zeolites-for-nh3-scr-of-nox-effect-of-structure-synthesis-procedure-and-chemical-composition-on-catalytic-performance-and-stability
#16
Avelino Corma, Nuria Martin Garcia, Peter Vennestrom, Joakim Reimer, Manuel Moliner
The direct preparation of different Fe-containing Beta and CHA zeolites has been attempted under diverse synthesis conditions, including alkaline and fluoride media, to evaluate the influence of their physico-chemical properties on the selective catalytic reduction (SCR) of NOx using NH3 as a reductant. From the different Fe-Beta zeolites, the sample prepared in absence of alkali-cations with a Si/Al~13, shows high NO conversion values (> 90%). However, this catalyst suffers from severe deactivation when aged at high temperatures in the presence of steam...
July 14, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28707737/-18-f-sodium-fluoride-positron-emission-tomography-of-the-equine-distal-limb-exploratory-study-in-three-horses
#17
M Spriet, P Espinosa, A Z Kyme, K L Phillips, S A Katzman, L D Galuppo, P Stepanov, D Beylin
BACKGROUND: Positron Emission Tomography (PET) is a cross-sectional, functional imaging modality that has recently become available to the horse. The use of (18) F-sodium fluoride ((18) F-NaF), a PET bone tracer, has never been reported in this species. OBJECTIVES: To assess the feasibility of (18) F-NaF PET in the equine distal limb and explore possible applications in the horse in comparison with other imaging modalities. STUDY DESIGN: Exploratory descriptive study involving three research horses...
July 14, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/28707300/high-conductivity-and-electron-transfer-validation-in-an-n-type-fluoride-anion-doped-polymer-for-thermoelectrics-in-air
#18
Xingang Zhao, Deepa Madan, Yan Cheng, Jiawang Zhou, Hui Li, Susanna M Thon, Arthur E Bragg, Mallory E DeCoster, Patrick E Hopkins, Howard E Katz
Air-stable and soluble tetrabutylammonium fluoride (TBAF) is demonstrated as an efficient n-type dopant for the conjugated polymer ClBDPPV. Electron transfer from F(-) anions to the π-electron-deficient ClBDPPV through anion-π electronic interactions is strongly corroborated by the combined results of electron spin resonance, UV-vis-NIR, and ultraviolet photoelectron spectroscopy. Doping of ClBDPPV with 25 mol% TBAF boosts electrical conductivity to up to 0.62 S cm(-1) , among the highest conductivities that have been reported for solution-processed n-type conjugated polymers, with a thermoelectric power factor of 0...
July 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28705712/hydrolysis-of-diadenosine-polyphosphates-exploration-of-an-additional-role-of-mycobacterium-smegmatis-mutt1
#19
S M Arif, U Varshney, M Vijayan
Diadenosine polyphosphates (ApnA, n=2-6), particularly Ap4A, are involved in several important physiological processes. The substantial sequence identity of the Nudix hydrolase domain (domain 1) of Mycobacterium smegmatis MutT1 (MsMutT1) with a known Ap4A hydrolase suggested that MsMutT1 could also hydrolyse diadenosine polyphosphates. Biochemical experiments yielded results in conformity with this suggestion, with Ap4A as the best among the substrates. ATP is a product in all experiments; small amounts of ADP were also observed in the experiments involving Ap4A and Ap6A...
July 10, 2017: Journal of Structural Biology
https://www.readbyqxmd.com/read/28704677/hydrated-electron-based-decomposition-of-perfluorooctane-sulfonate-pfos-in-the-vuv-sulfite-system
#20
Yurong Gu, Tongzhou Liu, Hongjie Wang, Huili Han, Wenyi Dong
As one of the most reactive species, hydrated electron (eaq(-)) is promising for reductive decomposition of recalcitrant organic pollutants, such as perfluorooctane sulfonate (PFOS). In this study, PFOS decomposition using a vacuum ultraviolet (VUV)/sulfite system was systematically investigated in comparison with sole VUV and ultraviolet (UV)/sulfite systems. A fast and nearly complete (97.3%) PFOS decomposition was observed within 4h from its initial concentration of 37.2μM in the VUV/sulfite system. The observed rate constant (kobs) for PFOS decomposition in the studied system was 0...
July 10, 2017: Science of the Total Environment
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