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https://www.readbyqxmd.com/read/28431331/dielectric-properties-of-a-novel-colloidal-oral-matrix-drug-carrier
#1
Alexander Vol, Orna Gribova, Oded Shamir, Evgeniya Levy, Paul Ben Ishai, Anna Greenbaum Gutina, Yuri Feldman
Dielectric Spectroscopy (DS) was employed to study a novel oral matrix carrier (OMC), composed from silica nano-particles, polysaccharides, biopolymers and natural oils. This composition self-orders to a multi hierarchal structure and as such is amenable to be studied by techniques such as DS. The dielectric properties were measured in the frequency range 1MHz-1GHz and a temperature range 10°C-45°C. The results were dominated by two relaxation processes following CC relaxation and having relaxation times that are Arrhenius in nature...
April 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28426946/quantification-of-rubidium-as-a-trace-element-in-beef-using-laser-induced-breakdown-spectroscopy
#2
Y Dixit, Maria P Casado-Gavalda, R Cama-Moncunill, Maria Markiewicz-Keszycka, X Cama-Moncunill, P J Cullen, Carl Sullivan
This study evaluates the potential of laser induced breakdown spectroscopy (LIBS) coupled with chemometrics to develop a quantification model for rubidium (Rb) in minced beef. A LIBSCAN 150 system was used to collect LIBS spectra of minced beef samples. Beef liver was used to spike the Rb levels in minced beef. All samples were dried, powdered and pelleted using a hydraulic press. Measurements were conducted by scanning 100 different locations with an automated XYZ sample chamber. Partial least squares regression (PLSR) was used to develop the calibration model, yielding a calibration coefficient of determination (Rc(2)) of 0...
April 1, 2017: Meat Science
https://www.readbyqxmd.com/read/28425532/emerging-tellurium-nanostructures-controllable-synthesis-and-their-applications
#3
REVIEW
Zhen He, Yuan Yang, Jian-Wei Liu, Shu-Hong Yu
Tellurium (Te) is a rare element in trace amounts of about one part per billion, comparable to that of platinum and ranked 75th in the abundance of the elements in the earth crust. Te nanostructures, as narrow bandgap semiconductors, have numerous potential applications in the fabrication of many modern devices. The past decades have witnessed an explosion in new strategies for synthesizing diverse emerging Te nanostructures with controlled compositions, sizes, shapes, and structures. Their structure-determined nature makes functional Te nanomaterials an attractive candidate for modern applications...
April 20, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28424000/heavy-metals-and-pahs-in-canned-fish-supplies-on-the-serbian-market
#4
Nikolina J Novakov, Željko A Mihaljev, Brankica D Kartalović, Bojan J Blagojević, Jelana M Petrović, Miroslav A Ćirković, Dragan R Rogan
The aim of this study was to determine the level of heavy metals and PAHs in 57 samples of canned tuna, 25 samples of canned sardines and 16 samples of canned smoked sprouts, collected from supermarkets in Serbia. Heavy metal levels (lead, cadmium, mercury, arsenic, iron, copper and zinc) were determined using an ICP-MS method. Sixteen analyzed PAHs were determined using a GC-MS method. The trace elements in canned fish were in the range (mg kg(-1)) of 0.01-0.28 for lead, 0.003-0.08 for cadmium, 0.007-0.64 for mercury, 0...
April 20, 2017: Food Additives & Contaminants. Part B, Surveillance
https://www.readbyqxmd.com/read/28422987/systematic-review-and-meta-analysis-shows-a-specific-micronutrient-profile-in-people-with-down-syndrome-lower-blood-calcium-selenium-and-zinc-higher-red-blood-cell-copper-and-zinc-and-higher-salivary-calcium-and-sodium
#5
Amene Saghazadeh, Maryam Mahmoudi, Atefeh Dehghani Ashkezari, Nooshin Oliaie Rezaie, Nima Rezaei
Different metabolic profiles as well as comorbidities are common in people with Down Syndrome (DS). Therefore it is relevant to know whether micronutrient levels in people with DS are also different. This systematic review was designed to review the literature on micronutrient levels in people with DS compared to age and sex-matched controls without DS. We identified sixty nine studies from January 1967 to April 2016 through main electronic medical databases PubMed, Scopus, and Web of knowledge. We carried out meta-analysis of the data on four essential trace elements (Cu, Fe, Se, and Zn), six minerals (Ca, Cl, K, Mg, Na, and P), and five vitamins (vitamin A, B9, B12, D, and E)...
2017: PloS One
https://www.readbyqxmd.com/read/28421430/imbalance-of-morphofunctional-responses-of-jurkat-t-lymphoblasts-at-short-term-culturing-with-relief-zinc-or-copper-containing-calcium-phosphate-coating-on-titanium
#6
L S Litvinova, V V Shupletsova, N A Dunets, O G Khaziakhmatova, K A Yurova, M Yu Khlusova, G B Slepchenko, E G Cherempey, Yu P Sharkeev, E G Komarova, M B Sedelnikova, I A Khlusov
Morphofunctional response of Jurkat T cells that were cultured for 24 h on substrates prepared from commercially pure titanium with relief microarc bilateral calcium phosphate coating containing copper or zinc was studied. Changes in the concentration of essential trace elements contained in this coating can cause significant imbalance of molecular processes of differentiation, secretion, apoptosis, and necrosis and reduce tumor cell survival.
January 2017: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28416730/early-accretion-of-water-and-volatile-elements-to-the-inner-solar-system-evidence-from-angrites
#7
Adam R Sarafian, Erik H Hauri, Francis M McCubbin, Thomas J Lapen, Eve L Berger, Sune G Nielsen, Horst R Marschall, Glenn A Gaetani, Kevin Righter, Emily Sarafian
Inner Solar System bodies are depleted in volatile elements relative to chondrite meteorites, yet the source(s) and mechanism(s) of volatile-element depletion and/or enrichment are poorly constrained. The timing, mechanisms and quantities of volatile elements present in the early inner Solar System have vast implications for diverse processes, from planetary differentiation to the emergence of life. We report major, trace and volatile-element contents of a glass bead derived from the D'Orbigny angrite, the hydrogen isotopic composition of this glass bead and that of coexisting olivine and silicophosphates, and the (207)Pb-(206)Pb age of the silicophosphates, 4568 ± 20 Ma...
May 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28416223/study-on-emission-of-hazardous-trace-elements-in-a-350%C3%A2-mw-coal-fired-power-plant-part-2-arsenic-chromium-barium-manganese-lead
#8
Shilin Zhao, Yufeng Duan, Lei Chen, Yaning Li, Ting Yao, Shuai Liu, Meng Liu, Jianhong Lu
Hazardous Trace elements (HTEs) emitted from coal combustion has raised widespread concern. Studies on the emission characteristics of five HTEs, namely arsenic (As), chromium (Cr), barium (Ba), manganese (Mn), lead (Pb) at three different loads (100%, 83%, 71% output) and different coal types were performed on a 350 MW coal-fired power plant equipped with SCR, ESP + FF, and WFGD. HTEs in the flue gas at the inlet/outlet of each air pollution control device (APCD) were sampled simultaneously based on US EPA Method 29...
April 14, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28415449/complementary-approaches-for-the-evaluation-of-biocompatibility-of-90-y-labeled-superparamagnetic-citric-acid-fe-er-3o4-coated-nanoparticles
#9
Bratislav Antic, Marko Boskovic, Jasmina Nikodinovic-Runic, Yue Ming, Hongguo Zhang, Emil S Bozin, Drina Janković, Vojislav Spasojevic, Sanja Vranjes-Djuric
Magnetic nanoparticles (MNPs) are of immense interest for diagnostic and therapeutic applications in medicine. Design and development of new iron oxide-based MNPs for such applications is of rather limited breadth without reliable and sensitive methods to determine their levels in body tissues. Commonly used methods, such as ICP, are quite problematic, due to the inability to decipher the origin of the detected iron, i.e. whether it originates from the MNPs or endogenous from tissues and bodily fluids. One of the approaches to overcome this problem and to increase reliability of tracing MNPs is to partially substitute iron ions in the MNPs with Er...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415163/fragmented-qrs-and-abnormal-creatine-kinase-mb-are-predictors-of-coronary-artery-disease-in-patients-with-angina-and-normal-electrocardiographys
#10
Jung Joo Lee, Jae Hoon Lee, Jin Woo Jeong, Jun Young Chung
Background/Aims: Patients with symptoms of coronary artery disease (CAD) often display normal tracings or only nonspecific changes on electrocardiography (ECG). The aim of this study was to explore strategic elements of the ECG and other potential factors that are predictive of CAD in this scenario. Methods: This was an observational study of 142 patients with the chief complaint of chest pain, each of whom presented with a normal ECG and was subjected to emergency coronary angiography (CAG)...
April 17, 2017: Korean Journal of Internal Medicine
https://www.readbyqxmd.com/read/28415006/accumulation-of-nonessential-trace-elements-ag-as-cd-cr-hg-and-pb-in-atlantic-horseshoe-crab-limulus-polyphemus-early-life-stages
#11
Aaron K Bakker, Jessica Dutton, Matthew Sclafani, Nicholas Santangelo
During early development, benthic organisms can accumulate nonessential trace elements through aqueous and particulate sources. This study investigated the accumulation of Ag, As, Cd, Cr, Hg and Pb in Atlantic horseshoe crab (Limulus polyphemus) pre-spawned eggs, embryos, and developing larvae collected from 5 sites on Long Island, NY and compared these concentrations to that found in sediment, pore water, and overlying water. All investigated elements were detected in embryos and larvae at all sites. Arsenic was found at the highest concentration in each life stage across all 5 sites, followed by Ag, whereas Cd, Hg and Pb concentrations varied between sites...
April 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28412492/element-variability-in-lacustrine-systems-of-terra-nova-bay-antarctica-and-concentration-evolution-in-surface-waters
#12
Isabella Zelano, Mery Malandrino, Agnese Giacomino, Sandro Buoso, Eleonora Conca, Yann Sivry, Marc Benedetti, Ornella Abollino
Major, minor and trace elements were determined in freshwater of lacustrine systems in Terra Nova Bay, along Victoria Land coast, Antarctica, as well as in algae and mosses. The samples were collected during some of the sampling campaigns between 2007 and 2011 (and the one of 2002) within the framework of the Italian National Program of Research in Antarctica (PNRA). Data were processed with chemometric techniques. Results showed that elements typically considered as potential anthropogenic pollutants (e.g...
April 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28411570/impacts-of-coal-fly-ash-on-plant-growth-and-accumulation-of-essential-nutrients-and-trace-elements-by-alfalfa-medicago-sativa-grown-in-a-loessial-soil
#13
Honghua He, Zhigang Dong, Qi Peng, Xia Wang, Chenbin Fan, Xingchang Zhang
Coal fly ash (CFA) is a problematic solid waste all over the world. One distinct beneficial reuse of CFA is its utilization in land application as a soil amendment. A pot experiment was carried out to assess the feasibility of using CFA to improve plant growth and increase the supply of plant-essential elements and selenium (Se) of a loessial soil for agricultural purpose. Plants of alfalfa (Medicago sativa) were grown in a loessial soil amended with different rates (5%, 10%, 20% and 40%) of CFA for two years and subjected to four successive cuttings...
April 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28411566/ambient-fine-particulate-matter-pm2-5-in-canadian-oil-sands-communities-levels-sources-and-potential-human-health-risk
#14
Md Aynul Bari, Warren B Kindzierski
An investigation of levels and potential sources affecting ambient fine particulate matter (PM2.5) and associated risk to public health was undertaken at two Canadian oil sands communities (Fort McKay and Fort McMurray) using a 4-year dataset (2010-2013). Geometric mean concentrations of PM2.5 at Fort McKay and Fort McMurray are not considered high and were 5.47μg/m(3) (interquartile range, IQR=3.02-8.55μg/m(3)) and 4.96μg/m(3) (IQR=3.20-7.04μg/m(3)), respectively. Carcinogenic risks of trace elements were below acceptable (1×10(-6)) and/or within tolerable risk (1×10(-4)), and non-carcinogenic risks were below a safe level of concern (hazard index=1)...
April 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28409884/altered-protein-expression-pattern-in-colon-tissue-of-mice-upon-supplementation-with-distinct-selenium-compounds
#15
Jette Rahn, Claudia Lennicke, Anna P Kipp, Andreas S Müller, Ludger A Wessjohann, Rudolf Lichtenfels, Barbara Seliger
The essential trace element Selenium (Se) is controversially discussed concerning its role in health and disease. Its various physiological functions are largely mediated by Se incorporation in the catalytic center of selenoproteins. To gain insights into the impact of Se deficiency and of supplementation with different Se compounds (selenite, selenate, selenomethionine) at defined concentrations (recommended, 150 μg/ kg diet; excessive, 750 μg/ kg diet) in murine colon tissues a twenty week feeding experiment was performed followed by analysis of the protein expression pattern of colon tissue specimens by 2D-DIGE and MALDI-TOF MS...
April 14, 2017: Proteomics
https://www.readbyqxmd.com/read/28408756/apple-pomace-improves-the-quality-of-pig-manure-aerobic-compost-by-reducing-emissions-of-nh3-and-n2o
#16
Hui Mao, Teng Zhang, Ronghua Li, Bingnian Zhai, Zhaohui Wang, Quan Wang, Zengqiang Zhang
In this study, the effects of apple pomace (AP) addition (0%, 5%, 10%, and 20% on a dry weight basis, named as control, AP1, AP2, and AP3) and citric acid (CA) addition on nitrogen conservation were investigated during aerobic composting of pig manure. Gaseous emissions of NH3 and N2O were inhibited by AP and CA addition, with AP's effect greater. The inhibition improved with increasing AP addition. The AP3 treatment was the most effective on NH3 adsorption and transformation to [Formula: see text]-N, improved with subsequent transformation to [Formula: see text]-N, and inhibition of N2O and [Formula: see text] production...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28407467/trace-uranium-partitioning-in-a-multi-phase-nano-feooh-system
#17
Martin E McBriarty, Jennifer A Soltis, Sebastien N Kerisit, Odeta Qafoku, Mark E Bowden, Eric J Bylaska, James J De Yoreo, Eugene S Ilton
The characterization of trace elements in minerals using extended X-ray absorption fine structure (EXAFS) spectroscopy constitutes a first step toward understanding how impurities and contaminants interact with the host phase and the environment. However, limitations to EXAFS interpretation complicate the analysis of trace concentrations of impurities that are distributed across multiple phases in a heterogeneous system. Ab initio molecular dynamics (AIMD)-informed EXAFS analysis was employed to investigate the immobilization of trace uranium associated with nanophase iron (oxyhydr)oxides, a model system for the geochemical sequestration of radiotoxic actinides...
April 13, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28406610/advanced-absorption-correction-for-3d-elemental-images-applied-to-the-analysis-of-pearl-millet-seeds-obtained-with-a-laboratory-confocal-micro-x-ray-fluorescence-spectrometer
#18
Ioanna Mantouvalou, Tim Lachmann, Sudhir P Singh, Katarina Vogel-Mikus, Birgit Kanngiesser
We present a novel absorption correction approach for elemental distribution images obtained with a laboratory confocal micro X-ray fluorescence spectrometer. The procedure is suited especially for biological samples, as a constant dark matrix with a varying minor or trace element distribution is assumed. The constant absorption in the sample is extracted from depth dependent measurements. By using the concept of an effective excitation energy, depth-dependent and element-specific excitation energy values are calculated...
April 13, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28405867/low-serum-magnesium-levels-are-associated-with-increased-risk-of-fractures-a-long-term-prospective-cohort-study
#19
Setor Kwadzo Kunutsor, Michael Richard Whitehouse, Ashley William Blom, Jari Antero Laukkanen
Magnesium, which is an essential trace element that plays a key role in several cellular processes, is a major component of bone; however, its relationship with risk of major bone fractures is uncertain. We aimed to investigate the association of baseline serum magnesium concentrations with risk of incident fractures. We analyzed data on 2245 men aged 42-61 years in the Kuopio Ischemic Heart Disease prospective cohort study, with the assessment of serum magnesium measurements and dietary intakes made at baseline...
April 12, 2017: European Journal of Epidemiology
https://www.readbyqxmd.com/read/28402265/systematical-comparison-of-biologically-active-foreign-ions-codoped-calcium-phosphate-microparticles-on-osteogenic-differentiation-in-rat-osteoporotic-and-normal-mesenchymal-stem-cells
#20
Xiao-Yi Chen, San-Zhong Xu, Xuan-Wei Wang, Xian-Yan Yang, Liang Ma, Lei Zhang, Guo-Jing Yang, Fan Yang, Lin-Hong Wang, Xin-Li Zhang, Kang Ting, Chang-You Gao, Xiao-Zhou Mou, Zhong-Ru Gou, Hai Zou
Osteoporosis is a disease characterized by structural deterioration of bone tissue, leading to skeletal fragility with increased fracture risk. Calcium phosphates (CaPs) are widely used in bone tissue engineering strategies as they have similarities to bone apatite except for the absence of trace elements (TEs) in the CaPs. Bioactive glasses (BGs) have also been used successfully in clinic for craniomaxillofacial and dental applications during the last two decades due to their excellent potential for bonding with bone and inducing osteoblastic differentiation...
March 28, 2017: Oncotarget
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