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https://www.readbyqxmd.com/read/28917739/determination-of-fluorine-in-copper-concentrate-via-high-resolution-graphite-furnace-molecular-absorption-spectrometry-and-direct-solid-sample-analysis-comparison-of-three-target-molecules
#1
Heloisa R Cadorim, Jefferson S de Gois, Aline R Borges, Maria Goreti R Vale, Bernhard Welz, Heike Gleisner, Christina Ott
The chemical composition of complex inorganic materials, such as copper concentrate, may influence the economics of their further processing because most smelters, and particularly the producers of high-purity electrolyte copper, have strict limitations for the permissible concentration of impurities. These components might be harmful to the quality of the products, impair the production process and be hazardous to the environment. The goal of the present work is the development of a method for the determination of fluorine in copper concentrate using high-resolution graphite furnace molecular absorption spectrometry and direct solid sample analysis...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28914601/left-ventricular-long-axis-function-assessed-with-cardiac-cine-mr-imaging-is-an-independent-predictor-of-all-cause-mortality-in-patients-with-reduced-ejection-fraction-a-multicenter-study
#2
Simone Romano, Robert M Judd, Raymond J Kim, Han W Kim, Igor Klem, John F Heitner, Dipan J Shah, Jennifer Jue, Afshin Farzaneh-Far
Purpose To evaluate the prognostic value of a simple index of left ventricular (LV) long-axis function-lateral mitral annular plane systolic excursion (MAPSE)-in a large multicenter population of patients with reduced ejection fraction (EF) who were undergoing cardiac magnetic resonance (MR) imaging. Materials and Methods This retrospective study included 1040 consecutive patients (mean age, 59.5 years ± 15.8) at four U.S. medical centers who were undergoing cardiac MR imaging for assessment of LV dysfunction with EF less than 50%...
September 14, 2017: Radiology
https://www.readbyqxmd.com/read/28911866/molecular-dynamics-simulations-of-stratum-corneum-lipid-mixtures-a-multiscale-perspective
#3
Timothy C Moore, Christopher R Iacovella, Anne Leonhard, Annette L Bunge, Clare McCabe
The lipid matrix of the stratum corneum (SC) layer of skin is essential for human survival; it acts as a barrier to prevent rapid dehydration while keeping potentially hazardous material outside the body. While the composition of the SC lipid matrix is known, the molecular-level details of its organization are difficult to infer experimentally, hindering the discovery of structure-property relationships. To this end, molecular dynamics simulations, which give molecular-level resolution, have begun to play an increasingly important role in understanding these relationships...
September 11, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28910723/sorption-desorption-equilibrium-and-diffusion-of-tetracycline-in-poultry-litter-and-municipal-biosolids-soil-amendments
#4
E D'Angelo
Tetracycline (TET) is commonly used to treat bacterial diseases in humans and chickens (Gallus gallus domesticus), is largely excreted, and is found at elevated concentrations in treated sewage sludge (biosolids) and poultry litter (excrement plus bedding materials). Routine application of these nutrient-and carbon-enriched materials to soils improves fertility and other characteristics, but the presence of antibiotics (and other pharmaceuticals) in amendments raises questions about potential adverse effects on biota and development of antibiotic resistance in the environment...
September 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28910324/effect-of-dialyzer-membrane-materials-on-survival-in-chronic-hemodialysis-patients-results-from-the-annual-survey-of-the-japanese-nationwide-dialysis-registry
#5
Masanori Abe, Takayuki Hamano, Atsushi Wada, Shigeru Nakai, Ikuto Masakane
BACKGROUND: Little information is available regarding which type of dialyzer membrane results in good prognosis in patients on chronic hemodialysis. Therefore, we conducted a cohort study from a nationwide registry of hemodialysis patients in Japan to establish the association between different dialyzer membranes and mortality rates. METHODS: We followed 142,412 patients on maintenance hemodialysis (female, 39.1%; mean age, 64.8 ± 12.3 years; median dialysis duration, 7 [4-12] years) for a year from 2008 to 2009...
2017: PloS One
https://www.readbyqxmd.com/read/28906167/-it-s-totally-destroyed-our-life-exploring-the-pathways-and-mechanisms-between-precarious-employment-and-health-and-well-being-among-immigrant-men-and-women-in-toronto
#6
Stephanie Premji
Precarious employment is rapidly growing, but qualitative data on pathways to and mechanisms for health and well-being is lacking. This article describes the cumulative and intersecting micro-level pathways and mechanisms between precarious employment and health among immigrant men and women in Toronto. It draws on semi-structured interviews conducted in 2014 with 15 women and 12 men from 11 countries of origin. The article describes how precarious employment, conceptualized by workers as encompassing powerlessness, economic insecurity, work for multiple employers, nonstandard and unpredictable schedules, hazardous working conditions, and lack of benefits and protections, negatively impacts workers' physical and mental health as well as that of their spouses or partners and children...
January 1, 2017: International Journal of Health Services: Planning, Administration, Evaluation
https://www.readbyqxmd.com/read/28904173/impact-of-metastasectomy-in-the-multimodality-approach-for-braf-v600e-metastatic-colorectal-cancer-the-mayo-clinic-experience
#7
Benny Johnson, Zhaohui Jin, Mark J Truty, Rory L Smoot, David M Nagorney, Michael L Kendrick, Benjamin R Kipp, Axel Grothey
BACKGROUND: BRAF V600E mutations are present in 8%-10% of patients with metastatic colorectal cancer (mCRC) and portend poor prognosis. This study investigated the impact of metastasectomy for patients with BRAF V600E mCRC. Subjects, Materials, and Methods . Using prospective clinical and molecular data, patients with BRAF V600E mCRC were analyzed for clinical characteristics and survival. Statistical analyses utilized the Kaplan-Meier method, log-rank test, and Cox proportional hazard models...
September 13, 2017: Oncologist
https://www.readbyqxmd.com/read/28903564/impact-of-an-artificial-digestion-procedure-on-aluminum-containing-nanomaterials
#8
Holger Sieg, Claudia Kästner, Benjamin Christoph Krause, Thomas Meyer, Agnes Burel, Linda Böhmert, Dajana Lichtenstein, Harald Jungnickel, Jutta Tentschert, Peter Laux, Albert Braeuning, Irina Estrela-Lopis, Fabienne Gauffre, Valerie Fessard, Jan Meijer, Andreas Luch, Andreas F Thünemann, Alfonso Lampen
Aluminum has gathered toxicological attention based on relevant human exposure and its suspected hazardous potential. Nanoparticles from food supplements or food contact materials may reach the human gastrointestinal tract. Here, we monitored the physico-chemical fate of aluminum-containing nanoparticles and aluminum ions when passaging an in vitro model of the human gastrointestinal tract. Small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM), ion beam microscopy (IBM), secondary ion beam mass spectrometry (TOF-SIMS), and inductively coupled plasma mass spectrometry (ICP-MS) in the single-particle mode were employed to characterize two aluminum-containing nanomaterials with different particle core materials (Al0, γAl2O3) and soluble AlCl3...
September 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28902038/removal-of-hazardous-surgical-smoke-using-a-built-in-filter-trocar-a-study-in-laparoscopic-rectal-resection
#9
Koo Yong Hahn, Dong Woo Kang, Zairul Azwan Mohd Azman, Se-Young Kim, Seon-Hahn Kim
BACKGROUND: Surgical smoke containing potentially carcinogenic and harmful materials is an inevitable consequence of surgical energy devices, and constitutes a substantial occupational hazard in the operating room. This study aimed to evaluate the efficacy of a built-in-filter trocar in eliminating hazardous surgical smoke during laparoscopic and robotic rectal surgery. METHODS: Ten patients who underwent rectal cancer resection were enrolled. Five patients underwent surgery utilizing a nonfiltered trocar, and the remaining 5 utilized a built-in-filter trocar...
September 8, 2017: Surgical Laparoscopy, Endoscopy & Percutaneous Techniques
https://www.readbyqxmd.com/read/28899351/association-of-plasma-potassium-with-mortality-and-end-stage-kidney-disease-in-patients-with-chronic-kidney-disease-under-nephrologist-care-the-nephrotest-study
#10
Sandra Wagner, Marie Metzger, Martin Flamant, Pascal Houillier, Jean-Philippe Haymann, François Vrtovsnik, Eric Thervet, Jean-Jacques Boffa, Ziad A Massy, Bénédicte Stengel, Patrick Rossignol
BACKGROUND: Low and high blood potassium levels are common and were both associated with poor outcomes in patients with chronic kidney disease (CKD). Whether such relationships may be altered in CKD patients receiving optimized nephrologist care is unknown. METHODS: NephroTest is a hospital-based prospective cohort study that enrolled 2078 nondialysis patients (mean age: 59 ± 15 years, 66% men) in CKD stages 1 to 5 who underwent repeated extensive renal tests including plasma potassium (PK) and glomerular filtration rate (GFR) measured (mGFR) by (51)Cr-EDTA renal clearance...
September 12, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28898751/treatment-of-model-solutions-and-wastewater-containing-selected-hazardous-metal-ions-using-a-chitin-lignin-hybrid-material-as-an-effective-sorbent
#11
Przemysław Bartczak, Łukasz Klapiszewski, Marcin Wysokowski, Izabela Majchrzak, Weronika Czernicka, Adam Piasecki, Hermann Ehrlich, Teofil Jesionowski
A chitin/lignin material with defined physicochemical and morphological properties was used as an effective adsorbent of environmentally toxic metals from model systems. Particularly significant is its use in the neutralization of real industrial wastes. The ions Ni(2+), Cu(2+), Zn(2+) and Pb(2+) were adsorbed on the functional sorbent, confirming the high sorption capacity of the newly obtained product, primarily due to the presence on its surface of numerous active functional groups from the component biopolymers...
September 9, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28895924/artificial-turf-contested-terrains-for-precautionary-public-health-with-particular-reference-to-europe
#12
Andrew Watterson
Millions of adults, children and teenagers use artificial sports pitches and playgrounds globally. Pitches are artificial grass and bases may be made up of crumb rubber from recycled tires or new rubber and sand. Player injury on pitches was a major concern. Now, debates about health focus on possible exposure and uptake of chemicals within pitch and base materials. Research has looked at potential risks to users from hazardous substances such as metals, volatile organic compounds, polycyclic aromatic hydrocarbons including benzo (a) (e) pyrenes and phthalates: some are carcinogens and others may be endocrine disruptors and have developmental reproductive effects...
September 12, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28893723/scientific-challenges-in-the-risk-assessment-of-food-contact-materials
#13
Jane Muncke, Thomas Backhaus, Birgit Geueke, Maricel V Maffini, Olwenn Viviane Martin, John Peterson Myers, Ana M Soto, Leonardo Trasande, Xenia Trier, Martin Scheringer
BACKGROUND: Food contact articles (FCAs) are manufactured from food contact materials (FCMs) that include plastics, paper, metal, glass, and printing inks. Chemicals can migrate from FCAs into food during storage, processing, and transportation. Food contact materials' safety is evaluated using chemical risk assessment (RA). Several challenges to the RA of FCAs exist. OBJECTIVES: We review regulatory requirements for RA of FCMs in the United States and Europe, identify gaps in RA, and highlight opportunities for improving the protection of public health...
September 11, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28893249/assessment-of-the-potential-respiratory-hazard-of-volcanic-ash-from-future-icelandic-eruptions-a-study-of-archived-basaltic-to-rhyolitic-ash-samples
#14
David E Damby, Claire J Horwell, Gudrun Larsen, Thorvaldur Thordarson, Maura Tomatis, Bice Fubini, Ken Donaldson
BACKGROUND: The eruptions of Eyjafjallajökull (2010) and Grímsvötn (2011), Iceland, triggered immediate, international consideration of the respiratory health hazard of inhaling volcanic ash, and prompted the need to estimate the potential hazard posed by future eruptions of Iceland's volcanoes to Icelandic and Northern European populations. METHODS: A physicochemical characterization and toxicological assessment was conducted on a suite of archived ash samples spanning the spectrum of past eruptions (basaltic to rhyolitic magmatic composition) of Icelandic volcanoes following a protocol specifically designed by the International Volcanic Health Hazard Network...
September 11, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28890894/risk-of-contamination-of-gametes-and-embryos-during-cryopreservation-and-measures-to-prevent-cross-contamination
#15
REVIEW
Daniel C Joaquim, Eduardo D Borges, Iara G R Viana, Paula A Navarro, Alessandra A Vireque
The introduction and widespread application of vitrification are one of the most important achievements in human assisted reproduction techniques (ART) of the past decade despite controversy and unclarified issues, mostly related to concerns about disease transmission. Guidance documents published by US Food and Drug Administration, which focused on the safety of tissue/organ donations during Zika virus spread in 2016, as well as some reports of virus, bacteria, and fungi survival to cryogenic temperatures, highlighted the need for a review of the way how potentially infectious material is handled and stored in ART-related procedures...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28890523/nation-wide-implementation-of-disaster-medical-coordinators-in-japan
#16
Shinichi Egawa, Tomomi Suda, Tracey Elizabeth Claire Jones-Konneh, Aya Murakami, Hiroyuki Sasaki
In the 2011 Great East Japan Earthquake (GEJE), successful medical and public health coordination by pre-assigned disaster medical coordinators saved many affected people, though the coordination itself had difficulties. This study aims to clarify the implementation and the challenges of disaster medical coordinators in Japan. We performed questionnaire surveillance in 2012 and 2014 to all prefectural government on assignment of disaster medical coordinators, their expected roles and supporting system. Out of all 47 prefectures, assignment or planning of disaster medical coordinators jumped up from four (8...
2017: Tohoku Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28889864/the-transfer-of-diatoms-from-freshwater-to-footwear-materials-an-experimental-study-assessing-transfer-persistence-and-extraction-methods-for-forensic-reconstruction
#17
E A Levin, R M Morgan, K R Scott, V J Jones
In recent years there has been growing interest in environmental forms of trace evidence, and ecological trace evidence collected from footwear has proved valuable within casework. Simultaneously, there has been growing awareness of the need for empirical experimentation to underpin forensic inferences. Diatoms are unicellular algae, and each cell (or 'frustule') consists of two valves which are made of silica, a robust material that favours their preservation both in sediments and within forensic scenarios...
September 2017: Science & Justice: Journal of the Forensic Science Society
https://www.readbyqxmd.com/read/28884705/cryptochrome-1-gene-expression-is-a-reliable-prognostic-indicator-in-egyptian-patients-with-chronic-lymphocytic-leukemia-a-cohort-prospective-study
#18
Deena Mohamed Habashy, Deena Samir Eissa, Mona Mahmoud Aboelez
Objectives Traditional prognostic factors have proven insufficient to account for the observed heterogeneity in the clinical behavior of chronic lymphocytic leukemia (CLL). Cryptochrome-1 (CRY-1) is a circadian clock gene essential in maintaining circadian rhythm and regulating cell proliferation. We evaluated CRY-1 gene expression in CLL patients, and assessed its putative role as a prognostic indicator for the clinical course of CLL. Materials and Methods Hundred CLL patients at diagnosis were studied for CRY-1 gene expression by qRT-PCR, and were followed up for assessment of time to first treatment (TFT)...
September 8, 2017: Turkish Journal of Haematology: Official Journal of Turkish Society of Haematology
https://www.readbyqxmd.com/read/28884517/biocompatibility-assessment-of-titanium-dioxide-nanoparticles-in-mice-feto-placental-unit
#19
Parvaneh Naserzadeh, Fatemeh Ghanbary, Parviz Ashtari, Enayatollah Seydi, Khadijeh Ashtari, Mohsen Akbari
As the applications of titanium dioxide nanomaterials (nTiO2 ) are growing with an ever-increasing speed, the hazardous risks of this material have become a major concern. Several recent studies have reported that nTiO2 can cross the placental barrier in pregnant mice and cause neurotoxicity in their offspring. However, the influence of these nanoparticles on the fetoplacental unit during the pregnancy is yet to be studied. The present study reports on the effects of nTiO2 on the anatomical structure of fetal brain and liver in a pregnant mice model...
September 7, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28876901/flexible-graphene-based-wearable-gas-and-chemical-sensors
#20
Eric Singh, M Meyyappan, Hari S Nalwa
Wearable electronics is expected to be one of the most active research areas in the next decade, therefore, nanomaterials possessing high carrier mobility, optical transparency, mechanical robustness and flexibility, light-weight, and environmental stability will be in immense demand. Graphene is one of the nanomaterials that fulfill all these requirements, along with other inherently unique properties and convenience to fabricate into different morphological nanostructures, from atomically thin single layers to nanoribbons...
September 6, 2017: ACS Applied Materials & Interfaces
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