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https://www.readbyqxmd.com/read/29345468/photochemistry-of-solid-films-of-the-neonicotinoid-nitenpyram
#1
Kifle Z Aregahegn, Michael J Ezell, Barbara J Finlayson-Pitts
The environmental fates of nitenpyram (NPM), a widely used neonicotinoid insecticide, are not well known. A thin solid film of NPM deposited on a germanium attenuated total reflectance (ATR) crystal was exposed to radiation from a low-pressure mercury lamp at 254 nm, or from broadband low pressure mercury photolysis lamps centered at 350 or 313 nm. The loss during photolysis was followed in time using FTIR. The photolysis quantum yields (), defined as the number of NPM molecules lost per photon absorbed, were determined to be (9...
January 18, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29345131/photolithography-based-nanopatterning-using-re-entrant-photoresist-profile
#2
Tong Kim, Yei Hwan Jung, Huilong Zhang, Kwangeun Kim, Juhwan Lee, Zhenqiang Ma
Photolithography based on optical mask is widely used in academic research laboratories due to its low-cost, simple mechanism, and ability to pattern in micron sized features on a wafer scale area. Since the resolution is bound by diffraction limits of the light source, nano-scale patterning using photolithography requires short wavelength light source combined with sophisticated optical elements, adding complexity and cost. In this paper, a novel method of sub-wavelength patterning process using conventional i-line mercury lamp is introduced, without the use of such advanced optical tools...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29344817/the-content-of-mercury-in-herbal-dietary-supplements
#3
Barbara Brodziak-Dopierała, Agnieszka Fischer, Wioletta Szczelina, Jerzy Stojko
The dietary supplement market in Poland has been growing rapidly, and the number of registered products and their consumption increases steadily. Among the most popular and the easiest to get are herbal supplements, available in any supermarket. The aim of this paper was to investigate the mercury content in the herbal supplements. The dietary supplements that have been examined (24) are available on the Polish market and contain one or more herbal ingredients. Supplements were pulverized in porcelain mortar and identified by AMA 254 atomic absorption spectrometer...
January 17, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29343992/validation-of-bp-devices-qardioarm%C3%A2-in-the-general-population-and-omron-m6-comfort%C3%A2-in-type-ii-diabetic-patients-according-to-the-european-society-of-hypertension-international-protocol-esh-ip
#4
Mirna N Chahine, Jirar Topouchian, Parounak Zelveian, Zoya Hakobyan, Arevik Melkonyan, Alaa Azaki, Reem Diab, Aya Harb, Roland Asmar
Background: Following the European Society of Hypertension International Protocol (ESH-IP) Revision 2010, QardioArm® and Omron M6 Comfort IT® oscillometric devices were evaluated in the general population and in patients with type II diabetes, respectively, for self-blood pressure (BP) measurement. Methods: Both devices, QardioArm® and Omron M6 Comfort®, measure BP at the brachial level. The ESH-IP Revision 2010 includes a total number of 33 subjects. For each measure, the difference between observer and device BP values was calculated...
2018: Medical Devices: Evidence and Research
https://www.readbyqxmd.com/read/29343762/mercury-sodium-exospheric-emission-as-a-proxy-for-solar-perturbations-transit
#5
Stefano Orsini, Valeria Mangano, Anna Milillo, Christina Plainaki, Alessandro Mura, Jim M Raines, Elisabetta De Angelis, Rosanna Rispoli, Francesco Lazzarotto, Alessandro Aronica
The first evidence at Mercury of direct relation between ICME transit and Na exosphere dynamics is presented, suggesting that Na emission, observed from ground, could be a proxy of planetary space weather at Mercury. The link existing between the dayside exosphere Na patterns and the solar wind-magnetosphere-surface interactions is investigated. This goal is pursued by analyzing the Na intensity hourly images, as observed by the ground-based THEMIS solar telescope during 10 selected periods between 2012 and 2013 (with seeing, σ < = 2″), when also MESSENGER data were available...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29341913/characterisation-of-pore-structures-of-pharmaceutical-tablets-a-review
#6
REVIEW
Daniel Markl, Alexa Strobel, Rüdiger Schlossnikl, Johan Bøtker, Prince Bawuah, Cathy Ridgway, Jukka Rantanen, Thomas Rades, Patrick Gane, Kai-Erik Peiponen, J Axel Zeitler
Traditionally, the development of a new solid dosage form is formulation-driven and less focus is put on the design of a specific microstructure for the drug delivery system. However, the compaction process particularly impacts the microstructure, or more precisely, the pore architecture in a pharmaceutical tablet. Besides the formulation, the pore structure is a major contributor to the overall performance of oral solid dosage forms as it directly affects the liquid uptake rate, which is the very first step of the dissolution process...
January 13, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29341601/determining-double-bond-position-in-lipids-using-online-ozonolysis-coupled-to-liquid-chromatography-and-ion-mobility-mass-spectrometry
#7
Rachel A Harris, Jody C May, Craig A Stinson, Yu Xia, John A McLean
The increasing focus on lipid metabolism has revealed a need for analytical techniques capable of structurally characterizing lipids with a high degree of specificity. Lipids can exist as any one of a large number of double bond positional isomers, which are indistinguishable by single-stage mass spectrometry alone. Ozonolysis reactions coupled to mass spectrometry have previously been demonstrated as a means for localizing double bonds in unsaturated lipids. Here we describe an online, solution-phase reactor using ozone produced via a low-pressure mercury lamp, which generates aldehyde products diagnostic of cleavage at a particular double bond position...
January 17, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29341238/temporal-trends-in-a-biomagnifying-contaminant-application-of-amino-acid-compound-specific-stable-nitrogen-isotope-analysis-to-the-interpretation-of-bird-mercury-levels
#8
Craig E Hebert, Brian N Popp
Temporal trends in levels of biomagnifying contaminants, such as mercury (Hg), in top predators can provide insights into changes in contaminant bioavailability through time. However, interpreting contaminant temporal trends in predators can be confounded by temporal changes in their diets which, in turn, could affect organism trophic position and exposure to biomagnifying contaminants. To address this issue, bulk stable nitrogen isotope analysis, i.e. analysis of whole tissue, is widely incorporated into contaminant monitoring programs for the estimation of organism trophic position...
January 17, 2018: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29341225/past-and-present-mercury-accumulation-in-the-lake-baikal-seal-temporal-trends-effects-of-life-history-and-toxicological-implications
#9
Amanda E Poste, Mikhail V Pastukhov, Hans Fredrik Veiteberg Braaten, Ted Ozersky, Marianne Moore
Despite global efforts to reduce anthropogenic mercury (Hg) emissions, the timescale and degree to which Hg concentrations in the environment and biota respond to decreased emissions remains challenging to assess or predict. Here we characterize long-term trends, life-history patterns in Hg accumulation and toxicological implications of Hg contamination for a freshwater seal from one of the world's largest lakes (Lake Baikal, Siberia) using contemporary tissues and archival teeth. Stable isotope analysis and Hg analyses of soft tissues (muscle, liver, kidney, blood, brain, heart) and teeth from 22 contemporary seals revealed rapid changes in diet and Hg accumulation in the first year of life with a stable diet and increase in tissue Hg throughout the rest of life...
January 17, 2018: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29339190/systemic-and-local-toxicity-of-metal-particles-released-from-hip-prostheses-a-review-of-experimental-approaches
#10
REVIEW
Divya Rani Bijukumar, Abhijith Segu, Júlio Cesar Matias de Souza, XueJun Li, Mark Barba, Louis Mercuri, Joshua Jacobs, Mathew Thoppil Mathew
Despite the technological improvements in orthopedic joint replacement implants, wear and corrosion products associated with the metal components of these implants may result in adverse local tissue and perhaps systemic reactions and toxicities. The current review encompasses a literature review of the local and systemic toxicity studies concerning the effect of CoCrMo wear particles released from wear and corrosion of orthopedic implants and prostheses. Release of metallic debris is mainly in the form of micro- and nano-particles, ions of different valences, and oxides composed of Co and Cr...
January 12, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/29338881/infiltration-behaviour-of-elemental-mercury-dnapl-in-fully-and-partially-water-saturated-porous-media
#11
Andrea D'Aniello, Niels Hartog, Thomas Sweijen, Domenico Pianese
Mercury is a contaminant of global concern due to its harmful effects on human health and for the detrimental consequences of its release in the environment. Sources of liquid elemental mercury are usually anthropogenic, such as chlor-alkali plants. To date insight into the infiltration behaviour of liquid elemental mercury in the subsurface is lacking, although this is critical for assessing both characterization and remediation approaches for mercury DNAPL contaminated sites. Therefore, in this study the infiltration behaviour of elemental mercury in fully and partially water saturated systems was investigated using column experiments...
January 8, 2018: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/29338696/transcriptional-responses-of-escherichia-coli-during-recovery-from-inorganic-or-organic-mercury-exposure
#12
Stephen P LaVoie, Anne O Summers
BACKGROUND: The protean chemical properties of mercury have long made it attractive for diverse applications, but its toxicity requires great care in its use, disposal, and recycling. Mercury occurs in multiple chemical forms, and the molecular basis for the distinct toxicity of its various forms is only partly understood. Global transcriptomics applied over time can reveal how a cell recognizes a toxicant and what cellular subsystems it marshals to repair and recover from the damage...
January 16, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29338215/improving-flue-gas-mercury-removal-in-waste-incinerators-by-optimization-of-carbon-injection-rate
#13
Guoliang Li, Qingru Wu, Shuxiao Wang, Zhenya Duan, Haitao Su, Lei Zhang, Zhijian Li, Yi Tang, Minjiang Zhao, Lei Chen, Kaiyun Liu, Yong Zhang
This study tested the mercury emission characteristics of six municipal solid waste incinerators (MSWIs) and recommended future mercury control via adjusting operational parameters. The results indicated that over 99% of the mercury in solid wastes ended in fly ash and flue gas, of which 3.3%-66.3% was emitted to air through stack gas. Mercury in the stack gas was mainly in the form of oxidized mercury (Hg2+), the proportion (65.4%-89.0%) of which was far higher than previous estimation (15%). Mercury removal efficiencies (MRE) of the tested incinerators were in the range of 33...
January 16, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29338029/implicit-learning-deficit-in-children-with-duchenne-muscular-dystrophy-evidence-for-a-cerebellar-cognitive-impairment
#14
Stefano Vicari, Giorgia Piccini, Eugenio Mercuri, Roberta Battini, Daniela Chieffo, Sara Bulgheroni, Chiara Pecini, Simona Lucibello, Sara Lenzi, Federica Moriconi, Marika Pane, Adele D'Amico, Guja Astrea, Giovanni Baranello, Daria Riva, Giovanni Cioni, Paolo Alfieri
This study aimed at comparing implicit sequence learning in individuals affected by Duchenne Muscular Dystrophy without intellectual disability and age-matched typically developing children. A modified version of the Serial Reaction Time task was administered to 32 Duchenne children and 37 controls of comparable chronological age. The Duchenne group showed a reduced rate of implicit learning even if in the absence of global intellectual disability. This finding provides further evidence of the involvement of specific aspects of cognitive function in Duchenne muscular dystrophy and on its possible neurobiological substrate...
2018: PloS One
https://www.readbyqxmd.com/read/29336880/marginal-gaps-between-2-calcium-silicate-and-glass-ionomer-cements-and-apical-root-dentin
#15
Vladimir Biočanin, Đorđe Antonijević, Srđan Poštić, Dragan Ilić, Zorica Vuković, Marija Milić, Yifang Fan, Zhiyu Li, Božidar Brković, Marija Đurić
INTRODUCTION: The outcome of periapical surgery has been directly improved with the introduction of novel material formulations. The aim of the study was to compare the retrograde obturation quality of the following materials: calcium silicate (Biodentine; Septodont, Saint-Maur-des-Fosses, France), mineral trioxide aggregate (MTA+; Cerkamed Company, Stalowa Wola, Poland), and glass ionomer cement (Fuji IX; GC Corporation, Tokyo, Japan). METHODS: Materials' wettability was calculated concerning the contact angles of the cements measured using a glycerol drop...
January 12, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29336485/a-multimodal-microcharacterisation-of-trace-element-zonation-and-crystallographic-orientation-in-natural-cassiterite-by-combining-cathodoluminescence-ebsd-epma-and-contribution-of-confocal-raman-in-sem-imaging
#16
G Wille, C Lerouge, U Schmidt
In cassiterite, tin is associated with metals (titanium, niobium, tantalum, indium, tungsten, iron, manganese, mercury). Knowledge of mineral chemistry and trace-element distribution is essential for: the understanding of ore formation, the exploration phase, the feasibility of ore treatment, and disposal/treatment of tailings after the exploitation phase. However, the availability of analytical methods make these characterisations difficult. We present a multitechnical approach to chemical and structural data that includes scanning electron microscopy (SEM)-based imaging and microanalysis techniques such as: secondary and backscattered electrons, cathodoluminescence (CL), electron probe microanalyser (EPMA), electron backscattered diffraction (EBSD) and confocal Raman-imaging integrated in a SEM (RISE)...
January 16, 2018: Journal of Microscopy
https://www.readbyqxmd.com/read/29335757/total-mercury-in-squalid-callista-megapitaria-squalida-from-the-sw-gulf-of-california-mexico-tissue-distribution-and-human-health-risk
#17
Abril K Romo-Piñera, Ofelia Escobar-Sánchez, Jorge Ruelas-Inzunza, Martín G Frías-Espericueta
We evaluated the total Hg concentration in different tissues of squalid callista Megapitaria squalida in order to measure Hg distribution in tissue and to estimate human health risk. Samples were obtained by free diving in the SW Gulf of California, Mexico. Concentrations are given on a wet weight basis. A total of 89 squalid callista specimens were obtained, presenting an average Hg concentration of 0.07 ± 0.04 µg g-1. There were no significant differences (p > 0.05) in Hg concentration between tissues (visceral mass = 0...
January 15, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29335217/synthesis-and-characterisation-of-calix-4-arene-based-bis-triazole-bis-hexahydroquinoline-probing-highly-selective-fluorescence-quenching-towards-mercury-hg2-analyte
#18
Burhan Khan, Abdul Hameed, Aaliya Minhaz, Muhammad Raza Shah
In the present study, we are reporting the synthesis of a triazoles incorporated fluorescent hexahydroquinoline appended calix[4]arene 7 and its highly selective optical recognition ability towards Hg2+. The optical sensor 7 was synthesized via two different synthetic pathways and unambiguously characterized by mass spectrometry and NMR spectroscopy. The stoichiometric ratio between 7 and Hg2+ was determined as 1:1 based on Job's plot and ESI-MS analysis. The chemosensor 7 selectively recognized Hg2+ in the presence of competitive cations such as Cu2+, Cu1+, Co3+, Ni2+, Ag1+, Fe2+, Fe3+, Cr3+, Pb2+, Cd2+, Zn2+, Sn2+, Ti4+, Sb3+, In3+, Ba2+, Ca2+, and K1+...
January 10, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29334858/case-study-of-occupational-mercury-exposure-during-decontamination-of-turnaround-in-refinery-plant
#19
Maytiya Muadchim, Wantanee Phanprasit, Mark Gregory Robson, Dusit Sujirarat, Rawee Detchaipitak
Decontamination during turnaround (TA) can lead to high exposure to toxic chemicals among workers. The decontamination process in refinery plants usually comprises two types, i.e. steam and chemical decontamination. No matter the method used, concentrations of toxic chemicals must be measured using the direct reading instrument at the end of each decontamination cycle, which maybe repeated several times until the readings are in acceptable level. To evaluate mercury exposure of decontamination workers during decontamination procedure in comprehensive turnaround of a refinery plant...
January 15, 2018: International Journal of Occupational and Environmental Health
https://www.readbyqxmd.com/read/29334588/molecular-wire-effects-in-phenyleneethynylene-oligomers-surprising-insights
#20
Uwe Heiko Bunz, Marcel Hergert, Markus Bender, Kai Seehafer
We report the synthesis and quenching behavior of a series of water soluble, carboxylate-carrying phenyleneethynylene oligomers - monomer to tetramer - and their polymers and investigate their quenching behavior with different test analytes (paraquat, lead salts, mercury salts, picric acid, methylpyridinium iodide) in water and compare the results to that of the conjugated polymer. We find significant but analyte-dependent enhancement effects. For monovalent quenchers only the molecular wire effect applies but for divalent quenchers multivalency effects are also important...
January 15, 2018: Chemistry: a European Journal
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