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https://www.readbyqxmd.com/read/29053883/pharmacokinetics-of-inorganic-cobalt-and-a-vitamin-b12-supplement-in-the-thoroughbred-horse-differentiating-cobalt-abuse-from-supplementation
#1
L L Hillyer, Z Ridd, S Fenwick, P Hincks, S W Paine
BACKGROUND: Whilst cobalt is an essential micronutrient for vitamin B12 synthesis in the horse, at supra-physiological concentrations it has been shown to enhance performance in humans and rats and there is evidence that its administration in high doses to horses poses a welfare threat. Animal sport regulators currently control cobalt abuse via international race day thresholds, but since cobalt may be present in physiological concentrations this work was initiated to explore means of potentially adding to application of those thresholds...
October 20, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/29053267/uptake-kinetics-and-trophic-transfer-of-tungsten-from-cabbage-to-a-herbivorous-animal-model
#2
James H Lindsay, Alan J Kennedy, Jennifer M Seiter-Moser, Anthony J Bednar, Robert E Boyd, David R Johnson, Paul Allison, Ryan V Tappero
This investigation builds on previous studies on military relevant tungsten (W) to more thoroughly explore environmental pathways, bioaccumulation kinetics during direct soil exposure versus trophic transfer and elucidate its relative accumulation and speciation in different snail organs. The modeled steady state concentration and bioaccumulation factor (BAF) of W from soil into cabbage were 302 mg/kg and 0.55, respectively. Steady state concentrations (34 mg/kg) and BAF values (0.05) obtained for the snail directly exposed to contaminated soil were lower than trophic transfer by consumption of W-contaminated cabbage (tissue concentration of 86 mg/kg; BAF of 0...
October 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29052468/evaluation-of-the-content-of-tio2-nanoparticles-in-the-coatings-of-chewing-gums
#3
William Dudefoi, Hélène Terrisse, Aurelian Florin Popa, Eric Gautron, Bernard Humbert, Marie-Hélène Ropers
Titanium dioxide is a metal oxide used as a white pigment in many food categories, including confectionery. Due to differences in the mass fraction of nanoparticles contained in TiO2, the estimated intakes of TiO2 nanoparticles differ by a factor of 10 in the literature. To resolve this problem, a better estimation of the mass of nanoparticles present in food products is needed. In this study, we focused our efforts on chewing gum, which is one of the food products contributing most to the intake of TiO2. The coatings of four kinds of chewing gum, where the presence of TiO2 was confirmed by Raman spectroscopy, were extracted in aqueous phases...
October 20, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29052149/rare-earth-elements-in-human-colostrum-milk
#4
Barbara Poniedziałek, Paweł Rzymski, Małgorzata Pięt, Przemysław Niedzielski, Mirosław Mleczek, Maciej Wilczak, Piotr Rzymski
Rare-earth elements (REEs) are used in a growing number of applications, and their release to environment has increased over the decades. Knowledge of REEs in human milk and factors that could possibly influence their concentration is scarce. This study evaluated the concentrations of 16 REEs (Ce, Eu, Er, Gd, La, Nd, Pr, Sc, Sm, Dy, Ho, Lu, Tb, Tm, Y, and Yb) in human colostrum milk collected from Polish women (n = 100) with the ICP-OES technique. The concentrations (mean ± SD) of Pr (41.9 ± 13.2 μg L(-1)), Nd (11...
October 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29051607/isotopic-compositions-of-236-u-239-pu-and-240-pu-in-soil-contaminated-by-the-fukushima-daiichi-nuclear-power-plant-accident
#5
Guosheng Yang, Hirofumi Tazoe, Kazuhiko Hayano, Kumiko Okayama, Masatoshi Yamada
Six years after the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, data for (236)U and (236)U/(238)U have remained limited to a few heavily contaminated samples. In the present study, activities of (236)U, (239)Pu, and (240)Pu, along with other U isotopes in 46 soil samples both heavily and lightly contaminated by this accident were measured by inductively coupled plasma-mass spectrometry (ICP-MS) and triple-quadrupole ICP-MS. The (236)U activities and (236)U/(238)U atom ratios in these soil samples were in the range of (0...
October 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29051444/the-investigation-of-unexpected-arsenic-compounds-observed-in-routine-biological-monitoring-urinary-speciation-analysis
#6
Elizabeth Leese, Malcolm Clench, Jackie Morton, Philip H E Gardiner, Vikki A Carolan
This study investigates the identity of two unexpected arsenic species found separately in a number of urine samples sent to the Health and Safety Executive's Health and Safety Laboratory for arsenic speciation (arsenobetaine, AB; arsenite, As(3+); arsenate, As(5+); monomethylarsonic acid, MMA(5+); and dimethylarsinic acid, DMA(5+)). Micro liquid chromatography coupled to inductively coupled plasma mass spectrometry (µLC-ICP-MS) and electrospray time of flight tandem mass spectrometry (ESI-QqTOF-MS/MS) were used to identify the two arsenic peaks by comparison to several characterized arsenicals: arsenocholine, AC; trimethyl arsine oxide, TMAO; dimethylarsenoacetate, DMAA; dimethylarsenoethanol, DMAE; thio-dimethylarsinate, thio-DMA; thio-dimethylarsenoacetate, thio-DMAA and thio-dimethylarsenoethanol, thio-DMAE...
May 20, 2017: Toxics
https://www.readbyqxmd.com/read/29051430/hair-microelement-profile-as-a-prognostic-tool-in-parkinson-s-disease
#7
Ferraro Stefano, Nasuti Cinzia, Piangerelli Marco, Guidi Marco, Giovannetti Rita, Ferri Augusto, Gabbianelli Rosita
Changes in the homeostasis of metals and microelements have been demonstrated in Parkinson's disease, whose etiology includes both a genetic and environmental basis. We studied the difference of microelements in the hair of Parkinson's disease subjects (n = 46) compared with healthy controls (n = 24). Hair was chosen as a representative matrix to measure microelements, since it is a vehicle of substance excretion from the human body and it allows for long-term evaluation of metal exposure. An inductively coupled plasma mass spectrometry (ICP-MS) analysis of hair collected from 24 Parkinson's patients compared with their healthy relatives used as controls shows a significant decrease in Ca (U = 166, p = 0...
November 16, 2016: Toxics
https://www.readbyqxmd.com/read/29050524/transcranial-doppler-systolic-flow-index-and-icp-derived-cerebrovascular-reactivity-indices-in-tbi
#8
Frederick Adam Zeiler, Danilo Cardim, Joseph Donnelly, David Menon, Marek Czosnyka, Peter Smieleweski
To explore relationships between transcranial Doppler (TCD) indices of cerebrovascular reactivity and those derived from intracranial pressure (ICP). GOALS: A. Confirm previously described co-variance patterns of TCD/ICP indices, and B. Describe thresholds for Sx (correlation between systolic flow velocity (FVs) and cerebral perfusion pressure (CPP)) associated with outcome. Retrospective cohort of traumatic brain injury (TBI) patients: with TCD and ICP monitoring, we calculated various continuous indices of cerebrovascular reactivity: A...
October 19, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29048891/correction-to-selenium-bioaccessibility-and-speciation-in-selenium-enriched-lettuce-investigation-of-the-selenocompounds-liberated-after-in-vitro-simulated-human-digestion-using-two-dimensional-hplc-icp-ms
#9
Emanueli do Nascimento da Silva, Federica Aureli, Marilena D'Amato, Andrea Raggi, Solange Cadore, Francesco Cubadda
No abstract text is available yet for this article.
October 19, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29046969/determination-of-airborne-trace-elements-in-an-urban-area-using-lichens-as-biomonitor
#10
Zehra Bozkurt
The amounts of elements emitted from industrial, domestic, and vehicle sources in Düzce through the analyses of lichens, which are bioindicators of air pollution, were determined in this research. Concentrations of Al, Fe, Cr, Mn, Co, Ni, Cu, Zn, As, V, Cd, Hg, and Pb in the lichens that were collected from 40 different points were analyzed using an inductively coupled plasma (ICP-MS) device. The highest concentration values were detected for Fe and Al, while the lowest concentration values were detected for Cd and Hg...
October 18, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29046823/functionalization-of-ti-40nb-implant-material-with-strontium-by-reactive-sputtering
#11
Markus Göttlicher, Marcus Rohnke, Yannik Moryson, Jürgen Thomas, Joachim Sann, Anja Lode, Matthias Schumacher, Romy Schmidt, Stefan Pilz, Annett Gebert, Thomas Gemming, Jürgen Janek
BACKGROUND: Surface functionalization of orthopedic implants with pharmaceutically active agents is a modern approach to enhance osseointegration in systemically altered bone. A local release of strontium, a verified bone building therapeutic agent, at the fracture site would diminish side effects, which could occur otherwise by oral administration. Strontium surface functionalization of specially designed titanium-niobium (Ti-40Nb) implant alloy would provide an advanced implant system that is mechanically adapted to altered bone with the ability to stimulate bone formation...
2017: Biomaterials Research
https://www.readbyqxmd.com/read/29045788/the-importance-of-surface-irox-in-stabilizing-ruo2-for-oxygen-evolution
#12
Maria Escudero-Escribano, Anders F Pedersen, Elisa A Paoli, Rasmus Frydendal, Daniel Friebel, Paolo Malacrida, Jan Rossmeisl, Ifan E L Stephens, Ib Chorkendorff
The high precious metal loading and high overpotential of the oxygen evolution reaction (OER) prevents the widespread utilization of polymer electrolyte membrane (PEM) water electrolyzers. Herein we explore the OER activity and stability in acidic electrolyte of a combined IrOx/RuO2 system consisting of RuO2 thin films with sub-monolayer (1, 2 and 4 Å) amounts of IrOx deposited on top. Operando extended X-ray absorption fine structure (EXAFS) on the Ir L-3 edge revealed a rutile type IrO2 structure with some Ir sites occupied by Ru, IrOx being at the surface of the RuO2 thin film...
October 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29045717/interaction-between-calcium-and-potassium-modulates-elongation-rate-in-cotton-fiber-cells
#13
Kai Guo, Lili Tu, Yonghui He, Jinwu Deng, Maojun Wang, Hui Huang, Zhonghua Li, Xianlong Zhang, Miriam Gifford
Calcium (Ca2+) is necessary for fiber cell development in cotton (Gossypium hirsutum), both as a cell wall structural component and for environmental signaling responses. It is also known that potassium (K+) plays a critical role in cotton fiber cell elongation. However, it is unclear whether Ca2+ integrates its activities with K+ to regulate fiber elongation. Here, we report the novel discovery that Ca2+ deficiency, when integrated with K+ signaling, promotes fiber elongation. Using inductively coupled plasma-mass spectrometry (ICP-MS), we determined dynamic profiles of the ionome in ovules and fibers at different developmental stages, and found that a high accumulation of macro-elements, but not Ca2+, was associated with longer fibers...
October 13, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29044143/metabolic-syndrome-in-rats-is-associated-with-erectile-dysfunction-by-impairing-pi3k-akt-enos-activity
#14
Rui Li, Kai Cui, Kang Liu, Hao Li, Yan Zhang, Xiaming Liu, Ruibao Chen, Mingchao Li, Tao Wang, Shaogang Wang, Jihong Liu, Ke Rao
Metabolic syndrome (MetS) is a risk factor for erectile dysfunction (ED), but the underlying mechanisms are unclear. The aims of this study were to determine the underlying mechanisms of metabolic syndrome-related ED (MED). Sprague Dawley (SD) rats were fed a high-fat diet for 6 months, and metabolic parameters were then assessed. An apomorphine test was conducted to confirm MED. Only rats with MED were administered an intracavernosal injection of either epidermal growth factor (EGF) or vehicle for 4 weeks...
October 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29043588/determination-of-element-composition-and-extraterrestrial-material-occurrence-in-moss-and-lichen-samples-from-king-george-island-antarctica-using-reactor-neutron-activation-analysis-and-sem-microscopy
#15
Tomasz Mróz, Katarzyna Szufa, Marina V Frontasyeva, Vladimir Tselmovich, Tatiana Ostrovnaya, Andrzej Kornaś, Maria A Olech, Jerzy W Mietelski, Kamil Brudecki
Seven lichens (Usnea antarctica and U. aurantiacoatra) and nine moss samples (Sanionia uncinata) collected in King George Island were analyzed using instrumental neutron activation analysis, and concentration of major and trace elements was calculated. For some elements, the concentrations observed in moss samples were higher than corresponding values reported from other sites in the Antarctica, but in the lichens, these were in the same range of concentrations. Scanning electron microscopy (SEM) and statistical analysis showed large influence of volcanic-origin particles...
October 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29043546/compensatory-reserve-weighted-intracranial-pressure-and-its-association-with-outcome-after-traumatic-brain-injury
#16
L Calviello, J Donnelly, D Cardim, C Robba, F A Zeiler, P Smielewski, M Czosnyka
OBJECTIVE: We introduced 'compensatory-reserve-weighted intracranial pressure (ICP),' named 'weightedICP' for brevity, as a variable that may better describe changes leading to mortality after traumatic brain injury (TBI) over the standard mean ICP. METHODS: ICP was monitored prospectively in over 1023 sedated and ventilated patients. The RAP coefficient (R-correlation, A-amplitude, and P-pressure) was calculated as the running correlation coefficient between slow changes in the pulse amplitude of ICP and the mean ICP...
October 17, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/29043544/icp-versus-laser-doppler-cerebrovascular-reactivity-indices-to-assess-brain-autoregulatory-capacity
#17
F A Zeiler, J Donnelly, D Cardim, D K Menon, P Smielewski, M Czosnyka
BACKGROUND: To explore the relationship between various autoregulatory indices in order to determine which approximate small vessel/microvascular (MV) autoregulatory capacity most accurately. METHODS: Utilizing a retrospective cohort of traumatic brain injury patients (N = 41) with: transcranial Doppler (TCD), intracranial pressure (ICP) and cortical laser Doppler flowmetry (LDF), we calculated various continuous indices of autoregulation and cerebrovascular responsiveness: A...
October 17, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/29040932/fabrication-of-porous-covalent-organic-frameworks-as-selective-and-advanced-adsorbents-for-the-on-line-preconcentration-of-trace-elements-against-the-complex-sample-matrix
#18
Jing-Min Liu, Xing-Zhi Wang, Chao-Yue Zhao, Jia-Li Hao, Guo-Zhen Fang, Shuo Wang
Herein, for the first time, the typical porous Covalent Organic Frameworks (COFs) CTpBD with superior chemical stability and large surface area were applied as sorbents for solid phase extraction of trace ions via flow injection followed by inductively coupled plasma mass spectrometry (ICP-MS) detection. The well-prepared and fully-characterized CTpBD COFs were filled in solid phase extraction cartridge as novel and robust adsorbents for element analysis. Separation and enrichment of Cr (III), Mn (II), Co (II), Ni (II), Cd (II), V (V), Cu (II), As (III), Se (IV), and Mo (VI) was then carried out, and the contents were measured by ICP-MS...
October 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29040647/brain-capillary-ultrastructure-in-idiopathic-normal-pressure-hydrocephalus-relationship-with-static-and-pulsatile-intracranial-pressure
#19
Vigdis Andersen Eidsvaag, Hans-Arne Hansson, Kjell Heuser, Erlend A Nagelhus, Per K Eide
Idiopathic normal pressure hydrocephalus (iNPH) is a neurodegenerative disease of unknown cause. We investigated the morphology of capillaries in frontal cortex biopsies from iNPH patients and related the observations to overnight intracranial pressure (ICP) scores. A biopsy (0.9×10 mm) was taken from where the ICP sensor subsequently was inserted. Brain capillaries were investigated by electron microscopy of biopsies from 27 iNPH patients and 10 reference subjects, i.e. patients (not healthy individuals) without cerebrospinal fluid circulation disturbances, in whom normal brain tissue was removed as part of necessary neurosurgical treatment...
October 10, 2017: Journal of Neuropathology and Experimental Neurology
https://www.readbyqxmd.com/read/29039091/elemental-analysis-in-biological-matrices-using-icp-ms
#20
Matthew N Hansen, Jeffrey D Clogston
The increasing exploration of metallic nanoparticles for use as cancer therapeutic agents necessitates a sensitive technique to track the clearance and distribution of the material once introduced into a living system. Inductively coupled plasma mass spectrometry (ICP-MS) provides a sensitive and selective tool for tracking the distribution of metal components from these nanotherapeutics. This chapter presents a standardized method for processing biological matrices, ensuring complete homogenization of tissues, and outlines the preparation of appropriate standards and controls...
2018: Methods in Molecular Biology
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