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Yuanwei Chen, Ying Wang, Xi Liu, Mai Lu, Jiangwei Cao, Tao Wang
Magnetic hyperthermia with the treating temperature range of 41-46 °C is an alternative therapy for cancer treatment. In this article, lanthanum strontium manganates (La1-x Sr x MnO3, 0.25 ≤ × ≤ 0.35) magnetic nanoparticles coated by hyaluronic acid (HA) which possesses the ability of targeting tumor cells were prepared by a simple hydrothermal method combined with a high-energy ball milling technique. The crystal structure, morphology, magnetic properties of the HA-coated magnetic nanoparticles (MNPs), and their heating ability under alternating magnetic field were investigated...
December 2016: Nanoscale Research Letters
Mei Li, Zhongti Sun, Wenqiang Yang, Tao Hong, Zhesheng Zhu, Yanxiang Zhang, Xiaojun Wu, Changrong Xia
Strontium doped lanthanum cobalt ferrite (LSCF) is a widely applied electrocatalyst for the oxygen reduction reaction (ORR) in solid-oxide fuel cells (SOFCs) operated at intermediate temperatures. Sr surface segregation in long-term operation has been reported to have contradicting effects that either degrade or improve the reaction. Thus, it is critical to understand the mechanism of surface Sr compounds on ORR kinetics. This work aims to verify the effect and propose the mechanism by decorating SrCO3 nanoparticles using the infiltration method...
December 1, 2016: Physical Chemistry Chemical Physics: PCCP
Haoxin Lv, Sachiko Masuda, Yoshiko Fujitani, Nurettin Sahin, Akio Tani
A new facultative methanol-utilizing bacterial strain SM30T was isolated from rice rhizosphere. Strain SM30T was Gram-stain negative, aerobic, motile, short rod, and grows optimally at pH 7 and at 28°C. It can tolerate 0 to 2% concentration of NaCl. Based on 16S rRNA gene sequence comparisons, strain SM30T was most closely related to Pleomorphomonas oryzae DSM 16300T, with low similarity of 94.17%. As one of the lanthanide metals, lanthanum could enhance its growth on methanol slightly. Phylogenetic trees based on mxaF, xoxF, and cpn60 genes of SM30T showed its distinct phylogenetic positions with known species...
November 14, 2016: International Journal of Systematic and Evolutionary Microbiology
S J Patil, A C Lokhande, D-W Lee, J H Kim, C D Lokhande
Lanthanum telluride (La2Te3) thin films are synthesized via a successive ionic layer adsorption and reaction (SILAR) method. The crystal structure, surface morphology and surface wettability properties are investigated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Field emission scanning electron microscopy (FE-SEM) and contact angle goniometer techniques, respectively. The La2Te3 material exhibits a specific surface area of 51m(2)g(-1) determined by Brunauer-Emmett-Teller (BET) method...
November 9, 2016: Journal of Colloid and Interface Science
Vasantha Gowda, Risto S Laitinen, Ville-Veikko Telkki, Anna-Carin Larsson, Oleg N Antzutkin, Perttu Lantto
The molecular, crystal, and electronic structures as well as spectroscopic properties of a mononuclear heteroleptic lanthanum(iii) complex with diethyldithiocarbamate and 1,10-phenanthroline ligands (3 : 1) were studied by solid-state (13)C and (15)N cross-polarisation (CP) magic-angle-spinning (MAS) NMR, X-ray diffraction (XRD), and first principles density functional theory (DFT) calculations. A substantially different powder XRD pattern and (13)C and (15)N CP-MAS NMR spectra indicated that the title compound is not isostructural to the previously reported analogous rare earth complexes with the space group P21/n...
November 28, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Xinyan Yang, Zhongqi Hao, Meng Shen, Rongxing Yi, Jiaming Li, Huiwu Yu, Lianbo Guo, Xiangyou Li, Xiaoyan Zeng, Yongfeng Lu
Determination of rare earth elements (REEs) plays an important role in the extraction process. In this work, surface-enhanced laser-induced breakdown spectroscopy (SENLIBS) was introduced to detect REEs (lanthanum, cerium,praseodymium,and neodymium elements) in an aqueous solution. The emission lines of La II 394.91nm, Ce II 418.66nm, Pr II 422.29nm, and Nd II 406.10nm were selected for quantitative analysis by drying the analytical samples on a Zn metal substrate surface and optimizing the experimental parameters...
January 15, 2017: Talanta
Haruka Nakanishi, Kosuke Iizuka, Tomoaki Takayama, Akihide Iwase, Akihiko Kudo
Mg, Ca, Sr, Ba and La-doped NaTaO3 has arisen as highly active photocatalysts for CO2 reduction to form CO using water as an electron donor accompanied by O2 evolution under UV irradiation and bubbling of 1 atmosphere of CO2 when an Ag cocatalyst was loaded on those photocatalysts. CO, H2 and O2 simultaneously formed. The ratio of the number of reacted electrons to that of holes was almost unity. This result indicated that water was consumed as an electron donor. A liquid-phase reduction method for loading of the Ag cocatalyst was superior to photodeposition and impregnation methods...
November 22, 2016: ChemSusChem
Lijin Zhang, Jinghua Yang, Cuihong Jin, Shengwen Wu, Xiaobo Lu, Xiaoyu Hu, Yaling Sun, Yuan Cai
Lanthanum (La) exerts adverse effects on the central nervous system. However, the mechanism underlying these adverse effects has not been clarified. It is known that oxidative stress plays an important role in neurological injuries induced by harmful factors. Nrf2 is very important in the response to oxidative stress in tissues and cells. The purpose of this study was to explore the effect of lanthanum chloride (LaCl3 ) on the spatial learning and memory of rats and to determine whether the Nrf2/ARE pathway acts in the hippocampus...
November 10, 2016: Journal of Neurochemistry
Melissandre Richard, Daniel Duprez, Nicolas Bion, Fabien Can
Low loading palladium supported yttrium-stabilized zirconia (0.2%wtPd/YSZ) and LaMnO3 perovskite were associated to study the partial oxidation of methane using labeled 18O2 in the gas phase. Synthesis gas production was demonstrated to occur via an indirect reaction where oxygen is first consumed in the total methane combustion. A Mars-Van-Krevelen mechanism was observed over Pd/YSZ at 425°C to yield C16O2 and C16O. A significant enhancement of the Pd/YSZ catalyst activity was achieved by the association of LaMnO3+Pd/YSZ in a dual catalyst bed...
November 9, 2016: ChemSusChem
Yong Xiang, Khanita Karaveg, Kelley W Moremen
Maturation of Asn-linked oligosaccharides in the eukaryotic secretory pathway requires the trimming of nascent glycan chains to remove all glucose and several mannose residues before extension into complex-type structures on the cell surface and secreted glycoproteins. Multiple glycoside hydrolase family 47 (GH47) α-mannosidases, including endoplasmic reticulum (ER) α-mannosidase I (ERManI) and Golgi α-mannosidase IA (GMIA), are responsible for cleavage of terminal α1,2-linked mannose residues to produce uniquely trimmed oligomannose isomers that are necessary for ER glycoprotein quality control and glycan maturation...
November 17, 2016: Proceedings of the National Academy of Sciences of the United States of America
SeyedHosein Payandeh GharibDoust, Michael Heere, Magnus H Sørby, Morten B Ley, Dorthe B Ravnsbæk, Bjørn C Hauback, Radovan Černý, Torben R Jensen
Two new bimetallic sodium or potassium lanthanum borohydrides, NaLa(BH4)4 and K3La(BH4)6, are formed using La(BH4)3 free of metal halide by-products. NaLa(BH4)4 crystallizes in an orthorhombic crystal system with unit cell parameters, a = 6.7987(19), b = 17.311(5), c = 7.2653(19) Å and space group symmetry Pbcn. This compound has a new structure type built from brucite-like layers of octahedra (hcp packing of anions) with half of the octahedral sites empty leading to octahedral chains similar to rutile (straight chains) or α-PbO2 (zig-zag chains)...
November 17, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Surajit Saha, Bing-Chen Cao, M Motapothula, Chun-Xiao Cong, Tarapada Sarkar, Amar Srivastava, Soumya Sarkar, Abhijeet Patra, Siddhartha Ghosh, Ariando, J M D Coey, Ting Yu, T Venkatesan
Here, we report the presence of defect-related states with magnetic degrees of freedom in crystals of LaAlO3 and several other rare-earth based perovskite oxides using inelastic light scattering (Raman spectroscopy) at low temperatures in applied magnetic fields of up to 9 T. Some of these states are at about 140 meV above the valence band maximum while others are mid-gap states at about 2.3 eV. No magnetic impurity could be detected in LaAlO3 by Proton-Induced X-ray Emission Spectroscopy. We, therefore, attribute the angular momentum-like states in LaAlO3 to cationic/anionic vacancies or anti-site defects...
November 15, 2016: Scientific Reports
Sachchidanand Tiwari, Pramod K Gupta, Yana Bagbi, Tamal Sarkar, Pratima R Solanki
In this paper, we present the result of studies related to the in situ synthesis of amino acid (L-Cysteine) capped lanthanum hydroxide nanoparticles [Cys-La(OH)3 NPs] towards the fabrication of efficient immunosensor for non-invasive detection of oral cancer. The characterization of Cys-La(OH)3 NPs was carried out by different techniques including X-ray diffraction, scanning electron microscopy, transmission electron microscopy, fourier transform infrared spectroscopy and electrochemical techniques. These Cys-La(OH)3 NPs were electrophoretically deposited onto an indium-tin-oxide glass substrate and used for immobilization of anti-cytokeratin fragment-21-1 (anti-Cyfra-21-1) for the electrochemical detection of Cyfra-21-1...
October 8, 2016: Biosensors & Bioelectronics
Bin Wang, Lailai Yan, Wenhua Huo, Qun Lu, Zixi Cheng, Jingxu Zhang, Zhiwen Li
Studies have shown that residents living near rare earth mining areas have high concentrations of rare earth elements (REEs) in their hair. However, the adverse effects of REEs on human health have rarely been the focus of epidemiological studies. The goal of this study was to evaluate the relationship between REEs in hair and the risk of hypertension in housewives. We recruited 398 housewives in Shanxi Province, China, consisting of 163 women with hypertension (cases) and 235 healthy women without hypertension (controls)...
January 2017: Environmental Pollution
Yang-Yang Liu, Ru-Ling Wang, Ping Zhang, Liang-Liang Sun, Jin Xu
Although lanthanum (La) has been used as an agricultural plant growth stimulant for approximately 50 years, high concentrations are toxic to plants. Despite significant advances in recent years, the mechanisms underlying the effects of La on root system development remain unclear. Here, we report that a high concentration of La inhibits primary root (PR) elongation and induces lateral root (LR) development. La results in cell death in PR tips, thereby leading to the loss of meristematic cell division potential, stem cell niche activity, and auxin distribution in PR tips...
November 2016: Journal of Experimental Botany
Michael Keith, Patricia de Sequera, François Clair, Riccardo Pedersini
BACKGROUND: Phosphate binders, such as lanthanum carbonate, control elevated serum-phosphate levels in patients with end-stage renal disease (ESRD). Lanthanum carbonate is available in oral powder and tablet form. The aim of this survey was to investigate satisfaction with, preference for, and adherence to lanthanum carbonate oral powder in patients with ESRD. SCOPE: Patients from France and Spain who had been taking lanthanum carbonate powder for at least 4 weeks, and who had experience of other phosphate binders of any formulation, were asked to complete an online or telephone survey...
2016: Drugs in Context
Valentina Innocenzi, Nicolò Maria Ippolito, Ida De Michelis, Franco Medici, Francesco Vegliò
Terbium and rare earths recovery from fluorescent powders of exhausted lamps by acid leaching with hydrochloric acid was the objective of this study. In order to investigate the factors affecting leaching a series of experiments was performed in according to a full factorial plan with four variables and two levels (4(2)). The factors studied were temperature, concentration of acid, pulp density and leaching time. Experimental conditions of terbium dissolution were optimized by statistical analysis. The results showed that temperature and pulp density were significant with a positive and negative effect, respectively...
October 24, 2016: Journal of Environmental Management
Hui Yang, Xiaopeng Zhang, Haibo Liu, Wenming Cui, Qiannan Zhang, Yongning Li, Zhou Yu, Xudong Jia
The increasing use of rare-earth elements (REE) and their compounds has led to their accumulation in the environment and has raised concern about their safety. The toxic effects of REE such as lanthanum are largely unknown; genotoxicity studies have been limited and results are controversial. We evaluated the genotoxicity of lanthanum nitrate (La(NO3)3) in several in vitro and in vivo tests, including bacterial reverse mutation assay (Ames test), mouse bone marrow micronucleus assay, and chromosome aberration assay...
November 1, 2016: Mutation Research
Anna Alexandrovna Arkhipova, Grigory Il'yich Tsysin, Mikhail Alexandrovich Statkus, Mikhail Alexandrovich Bol'shov, Irina Filippovna Seregina, Yury Alexandrovich Zolotov
A comparison of the efficiency of sorbents obtained by different methods of non-covalent immobilization of β-diketones on some low-polar matrices with respect to extraction of rare earth elements (REEs) was carried out. It was shown that sorbents containing reagent amounts of 1-8mmol/g can be obtained by sorption of reagents on low-polar matrices from aqueous and aqueous-organic solutions, and the value for the maximum capacity of the sorbent correlates with the specific surface of the matrix. Similar sorbents were also prepared by impregnating the matrix with reagent...
December 1, 2016: Talanta
Yan Suffren, Olivier Leynaud, Philippe Plaindoux, Alain Brenier, Isabelle Gautier-Luneau
The Ln(IO3)3(HIO3)y (y = 1 or 1.33) compounds are isostructural with the La(IO3)3(HIO3)y phases, but thermal studies reveal different behaviors. On the one hand, the partial thermal decompositions of these lanthanide compounds lead to the Ln(IO3)3 formulation, with a room temperature structure different from the β-La(IO3)3 obtained from La(IO3)3(HIO3)y. On the other hand, the partial thermal decompositions of the La1-xLnx(IO3)3(HIO3)y compounds prepared with lanthanides ions (Ce, Pr, Nd, Sm, Eu, Gd, and Yb) lead to acentric β-La1-xLnx(IO3)3...
October 19, 2016: Inorganic Chemistry
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