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https://www.readbyqxmd.com/read/28738564/determination-of-iodide-and-total-iodine-in-estuarine-waters-by-cathodic-stripping-voltammetry-using-a-vibrating-silver-amalgam-microwire-electrode
#1
Estrella Espada-Bellido, Zhaoshun Bi, Pascal Salaün, Constant M G van den Berg
Iodide in natural waters is an important nutrient to aquatic organisms and its determination is of relevance to marine aquaculture. For this reason it is of interest to have a simple analytical method for determination of iodide in water samples. Iodide in seawater can be determined electrochemically by cathodic stripping voltammetry (CSV) with a mercury drop electrode which has environmental drawbacks. In an attempt to minimise the use of mercury in voltammetry, a vibrating silver amalgam microwire electrode is used here for the determination by CSV of iodide speciation in natural waters including seawater...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28737378/quantitative-mid-infrared-cavity-ringdown-detection-of-methyl-iodide-for-monitoring-applications
#2
Ibrahim Sadiek, Qiang Shi, Douglas Wallace, Gernot Friedrichs
Methyl iodide is a toxic halocarbon with diverse industrial and agricultural applications and is an important ocean-derived trace gas that contributes to the iodine burden of the atmosphere. Quantitative analysis of CH3I is mostly based on gas chromatography coupled with mass spectrometry or electron capture detection (GC-MS/ECD) as yet, which often limits the ability to conduct in situ high-frequency monitoring studies. This work presents an alternative detection scheme based on mid-infrared continuous wave cavity ringdown spectroscopy (mid-IR cw-CRDS)...
July 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28737011/a-distinctive-patchy-osteomalacia-characterises-phospho1-deficient-mice
#3
Alan Boyde, Katherine A Staines, Behzad Javaheri, Jose Luis Millan, Andrew A Pitsillides, Colin Farquharson
The phosphatase PHOSPHO1 is involved in the initiation of biomineralisation. Bones in Phospho1 knockout (KO) mice show histological osteomalacia with frequent bowing of long bones and spontaneous fractures: they contain less mineral, with smaller mineral crystals. However, the consequences of Phospho1 ablation on the microscale structure of bone are not yet fully elucidated. Tibias and femurs obtained from wild-type and Phospho1 null (KO) mice (25-32 weeks old) were embedded in PMMA, cut and polished to produce near longitudinal sections...
August 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28736886/size-of-thyroid-carcinoma-by-histotype-and-variants-a-population-based-study-in-a-mildly-iodine-deficient-area
#4
Michela Marina, Gian Paolo Ceda, Luigi Corcione, Paolo Sgargi, Maria Michiara, Enrico Maria Silini, Graziano Ceresini
BACKGROUND: Data relating the size of thyroid cancer with histological types and variants are scarce. METHODS: All incident thyroid cancer diagnosed between 2003 and 2012 in a mildly iodine-deficient area were derived from a population-based tumor registry. Undifferentiated/anaplastic thyroid cancer and incidental cases were excluded. Major diameter of thyroid cancer, as assessed by pathological examination, was stratified in classes: ≤10 mm; 11-20 mm; 21-40 mm; and >40 mm...
July 24, 2017: Head & Neck
https://www.readbyqxmd.com/read/28736501/design-of-radioiodinated-pharmaceuticals-structural-features-affecting-metabolic-stability-towards-in-vivo-deiodination
#5
REVIEW
Lorenzo Cavina, Dion van der Born, Peter H M Klaren, Martin C Feiters, Otto C Boerman, Floris P J T Rutjes
Radioiodinated pharmaceuticals are convenient tracers for clinical and research investigations because of the relatively long half-lives of radioactive iodine isotopes (i.e., (123)I, (124)I, and (131)I) and the ease of their chemical insertion. Their application in radionuclide imaging and therapy may, however, be hampered by poor in vivo stability of the C-I bond. After an overview of the use of iodine in biology and nuclear medicine, we present here a survey of the catabolic pathways for iodinated xenobiotics, including their biodistribution, accumulation, and biostability...
June 30, 2017: European Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28736269/iodine-lithium-alpha-dextrin-il%C3%AE-d-against-staphylococcus-aureus-skin-infections-a-comparative-study-of-in-vitro-bactericidal-activity-and-cytotoxicity-between-il%C3%AE-d-and-povidone-iodine
#6
A P Zisi, M K Exindari, E K Siska, G G Koliakos
BACKGROUND: As antimicrobial resistance continuously increases, revisiting old antimicrobial agents, modified to enhance efficacy and safety, becomes important. Iodine has been widely used for more than 150 years as a wound and skin disinfectant; it is an effective broad range bactericide, and to date, it lacks reports of resistance development. The most important iodine-based agent is Povidone-Iodine (PVP-I) which provides excellent antibacterial activity. However, its safety profile has been questioned...
July 20, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28735955/current-status-of-carbon-dioxide-angiography
#7
REVIEW
Mel J Sharafuddin, Anna E Marjan
OBJECTIVE: Unfamiliarity of endovascular surgeons with carbon dioxide (CO2) angiography is one of the main reasons for its limited use. This review is intended to familiarize the reader with the principles and applications of that modality. METHODS: We conducted a comprehensive review of contemporary literature related to CO2 angiography and its use in the field of vascular and endovascular surgery, including technical details and diagnostic and interventional applications...
August 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28735893/mechanistic-and-kinetic-study-on-the-reaction-of-methylperoxy-radical-with-atomic-iodine
#8
Yunju Zhang, Ruojing Song, Yuxi Sun, Jingyu Sun, Rongshun Wang
Singlet and triplet potential energy surfaces for the CH3O2 with I reaction have been investigated computationally to propose the reaction mechanisms and possible products. Multichannel RRKM theory and transition-state theory have been used to compute the overall and individual rate constants at 200-3000K and 10(-14)-10(14)Torr. On the singlet PES, addition-elimination, substitution and H-abstraction mechanisms are located, and the addition-elimination mechanism is dominant. At 70Torr with N2 as bath gas, IM1(CH3OOI) formed by collisional stabilization is dominated at 200-300K, whereas CH2O and HIO are the major products at the temperatures between 350 and 3000K; The title reaction exhibits the typical falloff behavior...
May 5, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28735532/transition-metal-free-decarboxylative-iodination-new-routes-for-decarboxylative-oxidative-cross-couplings
#9
Gregory J P Perry, Jacob M Quibell, Adyasha Panigrahi, Igor Larrosa
Constructing products of high synthetic value from inexpensive and abundant starting materials is of great importance. Aryl iodides are essential building blocks for the synthesis of functional molecules and efficient methods for their synthesis from chemical feedstocks are highly sought after. Here we report a low-cost decarboxylative iodination that occurs simply from readily available benzoic acids and I2. The reaction is scalable and the scope and robustness of the reaction is thoroughly examined. Mechanistic studies suggest that this reaction does not proceed via a radical mechanism, which is in contrast to classical Hunsdiecker-type decarboxylative halogenations...
July 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28734989/hydroxyvitamin-d-assays-an-historical-perspective-from-deqas
#10
G D Carter, J Berry, R Durazo-Arvizu, E Gunter, G Jones, J Jones, H L J Makin, P Pattni, C T Sempos, P Twomey, E L Williams, S A Wise
Recent years have seen a substantial increase in demand for 25-hydroxyvitamin D (25-OHD) assays. DEQAS (the Vitamin D External Quality Assessment Scheme) has been monitoring the performance of these assays since 1989. The first DEQAS distribution was in June 1989 and results were submitted by 13 laboratories in the UK, two of which used HPLC/UV; the rest used ligand binding assays with a tritium tracer. Inter-laboratory CVs (ALTM) ranged from 29.3% (42.7 nmol/L) to 53.7% (20.0 nmol/L). Currently the scheme has participants in 56 countries using 30 methods or variants of methods...
July 19, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28734182/using-medically-derived-iodine-131-to-track-sewage-effluent-in-the-laurentian-great-lakes
#11
Michael P Montenero, Elizabeth K Dilbone, James T Waples
Tracking sewage wastewater in a large lake is difficult. Concentrations of pharmaceuticals that can be used as indicator compounds are quickly diluted and not easy to measure. In this study, we examined the potential of using medically-derived iodine-131 ((131)I, t½ = 8.02 d) as a tracer for Milwaukee sewage effluent in Lake Michigan. (131)I activities in sewage effluent from two Milwaukee wastewater treatment plants (WWTPs) were measured in conjunction with (131)I activities in water, sediment and biota in the Milwaukee Outer Harbor and Lake Michigan...
July 14, 2017: Water Research
https://www.readbyqxmd.com/read/28733634/unconventional-band-inversion-and-intrinsic-quantum-spin-hall-effect-in-functionalized-group-v-binary-films
#12
Sheng-Shi Li, Wei-Xiao Ji, Ping Li, Shu-Jun Hu, Tie Zhou, Chang-Wen Zhang, Shi-Shen Yan
Adequately understanding band inversion mechanism, one of the significant representations of topological phase, has substantial implications for design and regulation of topological insulators (TIs). Here, by identifying an unconventional band inversion, we propose an intrinsic quantum spin Hall (QSH) effect in iodinated group-V binary (ABI2) monolayers with a bulk gap as large as 0.409 eV, guaranteeing its viable application at room temperature. The nontrivial topological characters, which can be established by explicit demonstration of Z2 invariant and gapless helical edge states, are derived from the band inversion of antibonding states of p x,y orbitals at the K point...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28731345/asymmetric-%C3%AE-sulfonyl-and-%C3%AE-phosphoryl-oxylation-of-ketones-by-a-chiral-hypervalent-iodine-iii
#13
Guillaume Levitre, Audrey Dumoulin, Pascal Retailleau, Armen Panossian, Frederic R Leroux, Géraldine Masson
An enantioselective direct oxygenation of propiophenone derivatives mediated by a catalytic or stoichiometric amount of new chiral non-C2-symmetric iodoarenes(III) is reported. The reaction gives an easy entry to optically active α-sulfonyl- and α-phosphoryl oxyketones in respectable yields and enantioselectivities.
July 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28731176/hypotonic-contrast-media-is-more-toxic-than-isotonic-contrast-media-on-endothelial-cells-in-vivo-and-in-vitro
#14
Lihui Ren, Ping Wang, Zuoyan Wang, Yong Liu, Shuzheng Lv
The aim of the current study was to investigate the cytotoxic effects of hypotonic (iopamidol) and isotonic (iodixanol) contract media (CMs) in vitro and in vivo. A total of 60 Wistar rats were included and were randomly divided into three groups (20 rats per group). Iodixanol (4 g iodine/kg), iopamidol (4 g iodine/kg) or equal volume of normal saline was injected via tail vein. HUVEC and H5V cell viability was determined by Cell Counting Kit‑8 agents. Western blotting was performed to detect ATP‑binding cassette subfamily G member 1 (ABCG1) expression...
July 21, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28731110/a-redox-controlled-electrolyte-for-plasmonic-enhanced-dye-sensitized-solar-cells
#15
Yuqiao Fu, Siu-Pang Ng, Guangyu Qiu, Tak-Fu Hung, Chi-Man Lawrence Wu, Chun-Sing Lee
Plasmonic enhanced dye-sensitized solar cells (DSSCs) with metallic nanostructures suffer from corrosion problems, especially with the presence of the iodine/triiodide redox couple in the electrolyte. Herein, we introduce an alternative approach by compensating the corrosion with a modified liquid electrolyte. In contrast to the existing method of surface preservation for plasmonic nanostructures, the redox-controlled electrolyte (RCE) contains iodoaurate intermediates, i.e. gold(i) diiodide (AuI2(-)) and gold(iii) tetraiodide (AuI4(-)) with optimal concentrations, such that these intermediates are readily reduced to gold nanoparticles during the operation of DSSCs...
July 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28731100/the-15-n-nmr-chemical-shift-in-the-characterization-of-weak-halogen-bonding-in-solution
#16
Sebastiaan B Hakkert, Jürgen Gräfenstein, Mate Erdelyi
We have studied the applicability of (15)N NMR spectroscopy in the characterization of the very weak halogen bonds of nonfluorinated halogen bond donors with a nitrogenous Lewis base in solution. The ability of the technique to detect the relative strength of iodine-, bromine- and chlorine-centered halogen bonds, as well as solvent and substituent effects was evaluated. Whereas computations on the DFT level indicate that (15)N NMR chemical shifts reflect the diamagnetic deshielding associated with the formation of a weak halogen bond, the experimentally observed chemical shift differences were on the edge of detectability due to the low molar fraction of halogen-bonded complexes in solution...
July 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28731009/interlesional-flip-flop-between-68-ga-dotatate-and-fdg-pet-ct-in-thyroglobulin-elevated-negative-iodine-scintigraphy-tenis-syndrome
#17
Sandip Basu, Ashwini Kalshetty, Preeti Fargose
No abstract text is available yet for this article.
January 2017: National Medical Journal of India
https://www.readbyqxmd.com/read/28730819/hypervalent-iodine-reagent-mediated-oxidative-heterocyclization-of-aldoximes-with-heterocyclic-alkenes
#18
Akira Yoshimura, Khiem C Nguyen, Gregory T Rohde, Pavel S Postnikov, Mekhman S Yusubov, Viktor V Zhdankin
An efficient cycloaddition of heterocyclic alkenes with nitrile oxides generated in situ from the corresponding aldoximes using organohypervalent iodine(III) reagent, [hydroxy(tosyloxy)iodo]benzene (Koser's reagent), has been developed. The oxidative cyclization of various aldoximes with 1-propene-1,3-sultone affords the respective isoxazoline-ring fused heterobicyclic products in moderate to good yields. Furthermore, the reaction of aldoxime with a cyclic phospholene-oxide under similar conditions produces the corresponding heterobicyclic phospholene oxides in moderate yields...
July 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28730267/phantom-based-standardization-of-ct-angiography-images-for-spot-sign-detection
#19
Andrea Morotti, Javier M Romero, Michael J Jessel, Andrew M Hernandez, Anastasia Vashkevich, Kristin Schwab, Joseph D Burns, Qaisar A Shah, Thomas A Bergman, M Fareed K Suri, Mustapha Ezzeddine, Jawad F Kirmani, Sachin Agarwal, Angela Hays Shapshak, Steven R Messe, Chitra Venkatasubramanian, Katherine Palmieri, Christopher Lewandowski, Tiffany R Chang, Ira Chang, David Z Rose, Wade Smith, Chung Y Hsu, Chun-Lin Liu, Li-Ming Lien, Chen-Yu Hsiao, Toru Iwama, Mohammad Rauf Afzal, Christy Cassarly, Steven M Greenberg, Renee' Hebert Martin, Adnan I Qureshi, Jonathan Rosand, John M Boone, Joshua N Goldstein
PURPOSE: The CT angiography (CTA) spot sign is a strong predictor of hematoma expansion in intracerebral hemorrhage (ICH). However, CTA parameters vary widely across centers and may negatively impact spot sign accuracy in predicting ICH expansion. We developed a CT iodine calibration phantom that was scanned at different institutions in a large multicenter ICH clinical trial to determine the effect of image standardization on spot sign detection and performance. METHODS: A custom phantom containing known concentrations of iodine was designed and scanned using the stroke CT protocol at each institution...
July 20, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28729772/serial-stimulated-thyroglobulin-measurements-are-more-specific-for-detecting-distant-metastatic-differentiated-thyroid-cancer-before-radioiodine-therapy
#20
Teng Zhao, Jun Liang, Tianjun Li, Wen Gao, Yansong Lin
OBJECTIVE: Preablative stimulated thyroglobulin (ps-Tg) has the potential to be used in identifying distant metastatic differentiated thyroid carcinoma (DM-DTC), but its single level can be affected by remnant thyroid tissue and thyrotropin (TSH). The objective of this retrospective study was to evaluate the value of serial ps-Tg measurements in identifying DM-DTC specifically. METHODS: A total of 317 DTC patients with serial measurements of ps-Tg, TSH and anti-Tg antibody were divided into M1 (n=72) and M0 (n=245) according to the presence of distant metastasis (DM) or not...
June 2017: Chinese Journal of Cancer Research, Chung-kuo Yen Cheng Yen Chiu
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