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Wenhua Huo, Yibing Zhu, Zhenjiang Li, Yiming Pang, Bin Wang, Zhiwen Li
Rare earth elements (REEs) have many applications in industry, agriculture, and medicine, resulting in occupational and environmental exposure and concerns regarding REE-associated health effects. However, few epidemiological studies have examined the adverse effects of REEs on pregnancy outcomes. Therefore, this study examined the relationship between the REE concentrations in maternal hair growing during early pregnancy and the risk of neural tube defects (NTDs) in offspring. We included 191 women with NTD-affected pregnancies (cases) and 261 women delivering healthy infants (controls)...
April 12, 2017: Environmental Pollution
Hamid Rashidi Nodeh, Hassan Sereshti, Elham Zamiri Afsharian, Nina Nouri
A novel nanocomposite adsorbent based on nanosized lanthanum hydroxide doped onto magnetic reduced graphene oxide (MG@La) was synthesized and used for removal of phosphate and nitrate ions from river and sewage media. The composition, surface properties and morphology of the as prepared adsorbent were studied using Fourier transform-infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and field emission scanning electron microscopy (FE-SEM). The influence of main parameters on the efficiency of removal process including adsorbent dosage, salt addition, solution pH, contact time, and concentration of the analytes were thoroughly investigated...
April 6, 2017: Journal of Environmental Management
Ling Zhang, SuWan Jin, Yong Wang, Jiang Ji
In this study, a novel adsorbent of expanded graphite (EG) loaded with lanthanum (III)-iron (III) hydroxide (EG-LaFe) was prepared for phosphate removal. The single-factor of oscillating time, La/Fe molar ratio and total concentration of EG-LaFe were studied for optimization of preparation conditions. Effects of contact time, initial phosphate concentration, adsorption temperature and coexisting ions on the phosphate removal performance of EG-LaFe were investigated in detail. Adsorption kinetics and isothermal adsorption studies showed that the pseudo-second-order and the Langmuir model fitted the experimental data quite well...
April 10, 2017: Environmental Technology
Axel Oberemm, Monique Braun, Stefanie Sawada, Mario Pink, Falko Frenzel, Christel Rozycki, Christine Meckert, Elke Zabinsky, Albert Braeuning, Alfonso Lampen
The heat-induced food contaminant 3-monochloropropane-1,2-diol (3-MCPD) and its fatty acid esters exert nephrotoxicity in rodents. Previous studies including a non-targeted toxicoproteomics approach using samples from a 28-day oral toxicity study in rats with 10 mg/kg body weight (b.w.) of 3-MCPD, an equimolar dose of 53 mg/kg b.w. 3-MCPD dipalmitate and a lower dose of 13.3 mg/kg b.w. of 3-MCPD dipalmitate, revealed substance-induced alterations in metabolic pathways, especially for glycolysis and energy metabolism...
April 9, 2017: Archives of Toxicology
Elisa Sani, Luca Mercatelli, Marco Meucci, Luca Zoli, Diletta Sciti
We investigate the optical properties of LaB6 - based materials, as possible candidates for solid absorbers in Concentrating Solar Power (CSP) systems. Bulk LaB6 materials were thermally consolidated by hot pressing starting from commercial powders. To assess the solar absorbance and spectral selectivity properties, room-temperature hemispherical reflectance spectra were measured from the ultraviolet to the mid-infrared, considering different compositions, porosities and surface roughnesses. Thermal emittance at around 1100 K has been measured...
April 6, 2017: Scientific Reports
Mohammadreza Esmaeilirad, Mohammad Zabihi, Jalal Shayegan, Farhad Khorasheh
Monometallic and bimetallic supported metal oxides catalysts on γ-alumina were prepared by heterogeneous deposition-precipitation. The γ-alumina used as a support was synthesized by the sol-gel and the co-precipitation methods. Supports and catalysts were characterized by Brunauer-Emmett-Teller (BET) surface area, X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The performance of the prepared catalysts was studied for total oxidation of toluene in air at different relative humidity and oxidation temperatures...
March 18, 2017: Journal of Hazardous Materials
Christian Reitz, Di Wang, Daniela Stoeckel, Andre Beck, Thomas Leichtweiß, Horst Hahn, Torsten Brezesinski
Mesostructured non-silicate materials, particularly mixed-metal oxides, are receiving much attention in recent years due to their potential for numerous applications. Via polymer-templating method, perovskite-type lanthanum strontium manganese oxide (La1-xSrxMnO3, LSMO, with x ≈ 0.15 to 0.30) with a continuous 3D cubic network of 23 nm pores is prepared in thin film form for the first time. Characterization results from grazing incidence X-ray scattering, X-ray photoelectron spectroscopy, Rutherford backscattering spectrometry, and electron microscopy and tomography show that the dip-coated sol-gel-derived films are of high quality in terms of composition and morphology, and that they are stable to over 700 °C...
April 3, 2017: ACS Applied Materials & Interfaces
Seong Sik Shin, Eun Joo Yeom, Woon Seok Yang, Seyoon Hur, Min Gyu Kim, Jino Im, Jangwon Seo, Jun Hong Noh, Sang Il Seok
Perovskite solar cells (PSCs) exceeding a power conversion efficiency (PCE) of 20% have mainly been demonstrated by using mesoporous titanium dioxide (mp-TiO2) as an electron-transporting layer. However, TiO2 can reduce the stability of PSCs under illumination (including ultraviolet light). Lanthanum (La)-doped BaSnO3 (LBSO) perovskite would be an ideal replacement given its electron mobility and electronic structure, but LBSO cannot be synthesized as well-dispersible fine particles or crystallized below 500°C...
March 30, 2017: Science
Han Luo, Dai-Jun Zhou, Zhang Chen, Qi-Quan Zhou, Kui Wu, Kun Tian, Zhi-Wei Li, Zhen-Liang Xiao
In the present study an experimental high-altitude intestinal barrier injury rat model was established by simulating an acute hypoxia environment, to provide an experimental basis to assess the pathogenesis, prevention and treatment of altitude sickness. A total of 70 healthy male Sprague-Dawley rats were divided into two groups: Control group (group C) and a high-altitude hypoxia group (group H). Following 2 days adaptation, the rats in group H were exposed to a simulated 4,000-m, high-altitude hypoxia environment for 3 days to establish the experimental model...
February 2017: Experimental and Therapeutic Medicine
Y Eren Suyolcu, Yi Wang, Federico Baiutti, Ameer Al-Temimy, Giuliano Gregori, Georg Cristiani, Wilfried Sigle, Joachim Maier, Peter A van Aken, Gennady Logvenov
Among the range of complex interactions, especially at the interfaces of epitaxial oxide systems, contributing to the occurrence of intriguing effects, a predominant role is played by the local structural parameters. In this study, oxide molecular beam epitaxy grown lanthanum cuprate-based bilayers (consisting of a metallic (M) and an insulating phase (I)), in which high-temperature superconductivity arises as a consequence of interface effects, are considered. With the aim of assessing the role of the dopant size on local crystal structure and chemistry, and on the interface functionalities, different dopants (Ca(2+), Sr(2+) and, Ba(2+)) are employed in the M-phase, and the M-I bilayers are investigated by complementary techniques, including spherical-aberration-corrected scanning transmission electron microscopy...
March 28, 2017: Scientific Reports
Biao Lu, Peilian Li, Zhenhua Tang, Yingbang Yao, Xingsen Gao, Wolfgang Kleemann, Sheng-Guo Lu
Both relaxor ferroelectric and antiferroelectric materials can individually demonstrate large electrocaloric effects (ECE). However, in order to further enhance the ECE it is crucial to find a material system, which can exhibit simultaneously both relaxor ferroelectric and antiferroelectric properties, or easily convert from one into another in terms of the compositional tailoring. Here we report on a system, in which the structure can readily change from antiferroelectric into relaxor ferroelectric and vice versa...
March 27, 2017: Scientific Reports
Atonaltzin García-Jiménez, Fernando C Gómez-Merino, Olga Tejeda-Sartorius, Libia I Trejo-Téllez
Lanthanum (La) is considered a beneficial element, capable of inducing hormesis. Hormesis is a dose-response relationship phenomenon characterized by low-dose stimulation and high-dose inhibition. Herein we tested the effect of 0 and 10 μM La on growth and biomolecule concentrations of seedlings of four sweet bell pepper (Capsicum annuum L.) varieties, namely Sven, Sympathy, Yolo Wonder, and Zidenka. Seedling evaluations were performed 15 and 30 days after treatment applications (dat) under hydroponic greenhouse conditions...
2017: Frontiers in Plant Science
Chenxi Fei, Hongxia Liu, Xing Wang, Lu Zhao, Dongdong Zhao, Xingyao Feng
A comparative study of different sequences of two metal precursors [trimethylaluminum (TMA) and Tris(isopropylcyclopentadienyl) lanthanum (La((i)PrCp)3)] for atomic layer deposition (ALD) lanthanum aluminum oxide (LaxAlyO) films is carried out. The percentage compositions of C and N impurity of LaxAlyO films were investigated using in situ X-ray photoelectron spectroscopy (XPS). The effects of different oxidants on the physical and chemical properties and electrical characteristics of LaxAlyO films are studied before and after annealing...
December 2017: Nanoscale Research Letters
Y Yang, G Ferreira, C L Teets, B A Corl, W E Thomason, C A Griffey
The objectives of this study were to evaluate production performance, milk fatty acid composition, and nutrient digestibility in high-producing dairy cows consuming diets containing corn and hull-less barley (cultivar Amaze 10) in different proportions as the grain source. Eight primiparous and 16 multiparous Holstein cows were assigned to 1 of 4 diets in a replicated 4 × 4 Latin square design with 21-d periods. Cows were fed once daily (1200 h) by means of a Calan gate system (American Calan Inc., Northwood, NH)...
May 2017: Journal of Dairy Science
L López-Conesa, J M Rebled, D Pesquera, N Dix, F Sánchez, G Herranz, J Fontcuberta, C Magén, M J Casanove, S Estradé, F Peiró
LaNiO3 (LNO) thin films of 14 nm and 35 nm thicknesses grown epitaxially on LaAlO3 (LAO) and (LaAlO3)0.3(Sr2TaAlO6)0.7 (LSAT) substrates are studied using High Resolution Transmission Electron Microscopy (HRTEM) and High Angle Annular Dark Field (HAADF) imaging. The strain state of the films is studied using Geometric Phase Analysis (GPA). Results show the successful in-plane adaptation of the films to the substrates, both in the compressive (LAO) and tensile (LSAT) cases. Through the systematic analysis of HRTEM superstructure contrast modulation along different crystal orientations, localized regions of the monoclinic LaNiO2...
March 20, 2017: Physical Chemistry Chemical Physics: PCCP
Dechun Zhou, Xuemei Bai, Hang Zhou
Ho(3+)/Tm(3+) co-doped 50TeO2-25GeO2-3WO3-5La2O3-3Nb2O5-5Li2O-9BaF2 glass fiber is prepared with the rod-tube drawing method of 15 μm core diameter and 125 μm inner cladding diameter applied in the 2.0 μm-infrared laser. The 2.0 μm luminescence properties of the core glass are researched and the fluorescence intensity variation for different Tm(3+) doping concentration is systematically analyzed. The results show that the 2.0 μm luminescence of Ho(3+) is greatly influenced by the doping concentration ratio of Ho(3+) to Tm(3+) and that the maximum fluorescence intensity of the core glass can be obtained and its emission cross section can reach 0...
March 17, 2017: Scientific Reports
Nana Kinoshita, Chikako Nagasato, Taizo Motomura
Brown algal swarmers usually exhibit positive or negative phototaxis. Such behaviours influence the increasing or decreasing dispersal distance or colonization on the new substratum. We confirmed that the sign of phototaxis (negative or positive) in male gametes of Mutimo cylindricus was affected by extracellular Ca(2+) influx through Ca(2+) channels. Under the control condition (10(-2) M [Ca(2+) ]), male gametes swimming with a helical rotation of their cell body mostly showed positive phototaxis. At 10(-3) M [Ca(2+) ], more than half of the male gametes showed positive phototaxis, whereas the others showed negative phototaxis...
March 15, 2017: Photochemistry and Photobiology
K Harris, S Balcam
A male admitted in the early hours of the morning, complained of a four week, right sided, non-radiating, dull and intermittent abdominal pain. Imaging suggested a diagnosis of phlebosclerotic colitis which was later discounted when the patients' history of lanthanum carbonate ingestion was examined. Phlebosclerotic colitis mostly affects the Asian population, and its cause is still not known, but can be associated with specific radiographic features. Collections of lanthanum may confuse a diagnosis of phlebosclerotic colitis as well as other factors such as voxel errors, photon starvation and movement...
February 2017: Radiography
Kun-Yi Andrew Lin, Yu-Chien Chen, Tien-Yu Lin, Hongta Yang
Zirconia-supported LaCoO3 perovskite (LaCoO3/ZrO2 (LCZ)) is prepared and adopted for the first time as a heterogeneous catalyst for activating Oxone to degrade organic pollutants. The resulting LCZ exhibits a significantly higher surface area (i.e., 10 times) than bulk LaCoO3 powder as nanoscale LaCoO3 particles were easily afforded on the surface of ZrO2 support. As Rhodamine B (RB) decolorization is selected as a model test to evaluate catalytic activity for activating Oxone, LCZ showed a much higher catalytic activity to activate Oxone than LaCoO3 even though LCZ contained only 12...
July 1, 2017: Journal of Colloid and Interface Science
Soledad Perez Catán, Debora Bubach, Carla Di Fonzo, Laura Dopchiz, Maria Arribére, Martin Ansaldo
We report the contents of elements in feathers of Chinstrap penguin (Pygoscelis antarcticus), which had not been informed up to now, such as silver and bromine and others listed as hazardous by the United States Environmental Protection Agency as arsenic, cobalt, chromium, and mercury. Analyses of the element concentrations in feathers, adult and chicken, from Barton Peninsulas at 25 de Mayo (King George) Island, South Shetlands, were made by Instrumental Neutron Activation Analysis. Samarium, lanthanum a, thorium, and uranium concentrations in Chinstrap penguin feathers were below 0...
March 13, 2017: Environmental Science and Pollution Research International
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