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Marcela Miranda, Natália Noyma, Felipe S Pacheco, Leonardo de Magalhães, Ernani Pinto, Suzan Santos, Maria Fernanda A Soares, Vera L Huszar, Miquel Lürling, Marcelo M Marinho
We tested the hypothesis that a combination of coagulant and ballast could be efficient for removal of positively buoyant harmful cyanobacteria in shallow tropical waterbodies, and will not promote the release of cyanotoxins. This laboratory study examined the efficacy of coagulants [polyaluminium chloride (PAC) and chitosan (made of shrimp shells)] alone, and combined with ballast (lanthanum modified bentonite, red soil or gravel) to remove the natural populations of cyanobacteria collected from a shallow eutrophic urban reservoir with alternating blooms of Cylindrospermopsis and Microcystis...
May 2017: Harmful Algae
Yan Gao, Yiwei Zhang, Yuming Zhou, Chao Zhang, Hongxing Zhang, Shuo Zhao, Jiasheng Fang, Mengqiu Huang, Xiaoli Sheng
In this work, we report a feasible approach to synthesize a ternary nanocomposites, Pt/lanthanum doped mesoporous zirconium oxide (Pt/La2O3-ZrO2), via an effective two-step method. Ordered mesoporous La2O3-ZrO2 composites were firstly fabricated with mesoporous silica KIT-6 as a hard template. Subsequently, uniform Pt nanoparticles encapsulated by 4 hydroxyl-terminated poly (amidoamine) (G4-OH PAMAM) dendrimers were deposited on the La2O3-ZrO2 composites. The as-prepared samples were characterized by transmission electron microscope (TEM), N2 adsorption-desorption isotherm analysis, energy dispersion X-ray analysis (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and temperature programmed reduction (H2-TPR)...
May 10, 2017: Journal of Colloid and Interface Science
Cuimei Liu, Zhendong Hua, Xin Meng
For the first time in China, the inorganic element profiling of cocaine specimens was performed at the National Narcotics Laboratory. An inductive coupled plasma-mass spectrometry (ICP-MS) method was developed and validated for simultaneous analysis of 26 inorganic elements, including sodium (Na), magnesium (Mg), aluminuim (Al), potassium (K), calcium (Ca), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), arsenic (As), selenium (Se), molybdenum (Mo), silver (Ag), cadmium (Cd), antimony (Sb), barium (Ba), lanthanum (La), cerium (Ce), thallium (Tl), lead (Pb), thorium (Th), and uranium (U) in illicit cocaine samples...
April 29, 2017: Forensic Science International
Wanping Chen, Jun Yang, Yue Zhao, Yangjie Hu, Bolin Xiang
Generally, metal-organic frameworks (MOFs) are made up from kinds of repeating microporous structure. Here, a series of Eu(3+) ions activated terephthalate-based lanthanum-organic frameworks (La-MOFs) was synthesized by a hydrothermal reaction. By controlling the reaction time, we obtained some unique brick-shaped La-MOFs in a micron scale size range, and these La-MOFs showed tunable mesoporous and macroporous architectures. It is speculated that the change in the composition and structure of building units results in the formation of this mesoporous and macroporous heterogeneous architectures...
May 16, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
L Chevalier, J Selim, D Genty, J M Baste, N Piton, I Boukhalfa, M Hamzaoui, P Pareige, V Richard
This study presents a methodological approach for the visualization of the glycocalyx by electron microscopy. The glycocalyx is a three dimensional network mainly composed of glycolipids, glycoproteins and proteoglycans associated with the plasma membrane. Since less than a decade, the epithelial and endothelial glycocalyx proved to play an important role in physiology and pathology, increasing its research interest especially in vascular functions. Therefore, visualization of the glycocalyx requires reliable techniques and its preservation remains challenging due to its fragile and dynamic organization, which is highly sensitive to the different process steps for electron microscopy sampling...
May 12, 2017: Morphologie: Bulletin de L'Association des Anatomistes
A Suslov, S Kobylianska, D Durilin, O Ovchar, V Trachevskii, B Jancar, A Belous
Barium-strontium titanate (BST) Ba0.6Sr 0.4 TiO3 and lanthanum-lithium titanate (LLT) La0.5Li0.5TiO3 nanopowders and thin films have been obtained via the modified Pechini route. Polyesterification and complexation processes of gel formation have been examined. Hypothetical models of coordinative polymers formed in sol-gel system have been suggested. It has been shown that BST and LLT solid solutions form in one step at relatively low temperature. X-ray diffraction confirms that the final products, which are single phases and have cubic shape, are formed at 600 and 700 °C for BST and LLT respectively...
December 2017: Nanoscale Research Letters
Andrea Ravagli, Christopher Craig, Ghada A Alzaidy, Paul Bastock, Daniel W Hewak
Gallium lanthanum sulfide glass (GLS) has been widely studied in the last 40 years for middle-infrared applications. In this work, the results of the substitution of selenium for sulphur in GLS glass are described. The samples are prepared via melt-quench method in an argon-purged atmosphere. A wide range of compositional substitutions are studied to define the glass-forming region of the modified material. The complete substitution of Ga2 S3 by Ga2 Se3 is achieved by involving new higher quenching rate techniques compared to those containing only sulfides...
May 11, 2017: Advanced Materials
Eyal Kurzbaum, Yasmin Raizner, Oded Cohen, Guy Rubinstein, Oded Bar Shalom
Adsorption has been suggested as an effective method for removing phosphates from agricultural wastewater effluents that contain relatively high phosphate concentrations. The present study focused on the use of a bentonite-lanthanum clay (Phoslock(®)) for reducing the dissolved phosphate concentration in fishpond effluents. Batch experiments with synthetic phosphate-spiked solutions and with fishpond effluents were performed in order to determine adsorption equilibrium isotherms and kinetics as well as to determine the efficiency of Phoslock(®) in removing phosphate from these solutions...
May 10, 2017: Environmental Science and Pollution Research International
Jan Aaseth, Anne-Lise Bjørke-Monsen
Lanthanum (La) is considered to be a non-essential element. La has been used for several decades in China to improve yield in plant production and has also been shown to have significant performance enhancing effects in feeding trials on animal husbandry. The estimated dietary intake of La in humans is below 150 µg, which is lower than 10% of the estimated limit of safe and acceptable daily intake. Upon ingestion of La as carbonate the lanthanum ion (La3+) is released in the stomach and traps dietary phosphate as insoluble lanthanum phosphate complexes in the gut, thereby inhibiting phosphate absorption...
May 9, 2017: Current Medicinal Chemistry
R Jbeli, A Boukhachem, I Ben Jemaa, N Mahdhi, F Saadallah, H Elhouichet, S Alleg, M Amlouk, H Ezzaouïa
Metal transition doped oxide thin films or nanocomposites have recently emerged at the forefront of potentials research. With the focus mainly on efficiency, the aspect of stability against optical irradiation of such materials has so far not been thoroughly addressed. This work covers the synthesis of silver doped lanthanum oxide thin films (La2O3:Ag) which have been prepared by the spray pyrolysis technique on glass substrates at 460°C. Then, Ag thin films were grown on lanthanum oxide thin films by thermal evaporation...
April 28, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Ghasem Bahlakeh, Bahram Ramezanzadeh
The influences of steel surface treatment by a novel cerium-lanthanum (Ce-La) nanofilm on the adhesion mechanism of an epoxy adhesive were studied through experimental and modeling approaches. The surface morphology and microstructure of the film deposited were characterized by atomic force microscopy (AFM), scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The surface free energy and work of adhesion values were evaluated through contact angle analysis...
May 8, 2017: ACS Applied Materials & Interfaces
A Neradova, S P Schumacher, I Hubeek, P Lux, L J Schurgers, M G Vervloet
BACKGROUND: Vascular calcification is a major contributing factor to mortality in end stage renal disease (ESRD). Despite the efficacy of phosphate binders to improve hyperphosphatemia, data on vascular calcification are less clear. There seems to be a difference in attenuation or delay in progression between different binders. In this in vitro experiment we tested whether phosphate binders could limit bioavailability of vitamin K2 by undesired binding. Vitamin K-deficiency limits activation of the vascular tissue mineralization inhibitor matrix γ-carboxyglutamate (Gla) protein (MGP) thereby exacerbating vascular calcification...
May 2, 2017: BMC Nephrology
Anindya Sundar Patra, Gaurangi Gogoi, Ranjan Kumar Sahu, Mohammad Qureshi
To the best of our knowledge this is the first report in which ruthenium doped polycrystalline lanthanum manganite, LaMn1-xRuxO3 (x = 0.0-0.4), having high efficacy for oxygen production from water without the use of any sacrificial reagent or co-catalyst and as an efficient photocatalyst for dye degradation is reported. Ruthenium doping alters the crystal structure of the parent LaMnO3 (LMO) due to the induced chemical pressure of the larger Ru(4+) ion, which facilitates a bond angle of 180° in the Mn(3+)-O-Mn(4+) plane resulting in the easy extraction of a photo-generated charge carrier population leading to enhanced photocatalytic activity...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
Simon Peschke, Lisa Gamperl, Valentin Weippert, Dirk Johrendt
The new lanthanum vanadium oxyselenides LaVSe2O, La5V3Se6O7, La5V3Se7O5, La7VSe5O7, and La13V7Se16O15 were synthesized in eutectic NaI/KI fluxes, and their crystal structures were determined using single-crystal and powder X-ray diffraction experiments. LaVSe2O and La5V3Se6O7 adopt known structure types, whereas La5V3Se7O5, La7VSe5O7, and La13V7Se16O15 crystallize in hitherto unknown structure types. The main building blocks of these compounds are chains of edge-sharing VSe6, VSe5O, and/or VSe4O2 octahedra, linked together by edge-sharing OLa4 and/or OLa3V tetrahedra forming fluorite-like ribbons...
May 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Sven H Zottnick, Maik Finze, Klaus Müller-Buschbaum
The lanthanum tetracyanoborate coordination polymers [EMIM] [LaNO3{B(CN)4}3(H2O)3] (EMIM = 1-ethyl-3-methylimidazolium) and [La(NO3)2[B(CN)4](H2O)4] mark first examples of Ln-tetracyanoborates that have been obtained in ionothermal syntheses without further solvents to influence e.g. viscosity. Thereby, the ionic liquid [EMIM][B(CN)4] is fully incorporated into product formation.
May 4, 2017: Chemical Communications: Chem Comm
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
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