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Liping Fang, Qiantao Shi, Jessica Nguyen, Baile Wu, Zimeng Wang, Irene M C Lo
Lanthanum-based materials are effective for sequestering phosphate in water, however their removal mechanisms remain unclear, and the effects of environmentally relevant factors have not yet been studied. Hereby, this study explored the mechanisms of phosphate removal using La(OH)3 by employing extended X-ray absorption spectroscopy (EXAFS), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), density functional theory (DFT) and chemical equilibrium modeling. The results showed that surface complexation was the primary mechanism for phosphate removal and in binary phosphate configurations, namely diprotonated bidentate mononuclear (BM-H2) and bidentate binuclear (BB-H2), coexisting on La(OH)3 in acidic conditions...
October 16, 2017: Environmental Science & Technology
Yuri Sol, Seon Hee Choi, Hak Jin Kim, Yong-Woo Kim, Byung Mann Cho, Hyung Soo Han, Ki J Choi
Triolein emulsion has been known to increase vascular permeability in the brain when it is infused into the carotid artery. The purpose of this study was to identify the morphologic mechanism of increased vascular permeability in brain induced by infusion of emulsified triolein into the carotid artery by transmission electron microscopy (TEM). Triolein emulsion was infused into the carotid artery of rats. TEM using lanthanum tracer was used to evaluate morphologic changes in endothelium with a focus on transcytotic vesicles and tight junction opening...
October 1, 2017: Microscopy
Cuihong Jin, Liang Gao, Yingqi Li, Shengwen Wu, Xiaobo Lu, Jinghua Yang, Yuan Cai
Rare-earth elements (REEs) are applied in various fields by virtue of their superior physical and chemical properties. Surveys have reported that REEs can impair learning and memory in children and induce neurobehavioral abnormalities in animals. However, the mechanism underlying this neurotoxicity is still unclear. Lanthanum (La) is often chosen to study the effects of REEs. Here, we investigated the role of astrocyte-neuron lactate shuttle (ANLS) in spatial learning and memory impairment induced by LaCl3 in hippocampus, an important spatial memory-related brain region...
October 9, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Yangyang Liu, Liangliang Sun, Ping Zhang, Jinpeng Wan, Ruling Wang, Jin Xu
Lanthanum (La) is one of rare earth elements that was used as a crop growth stimulants; however, high concentration of La markedly inhibited plant growth. Our previous study indicated that, although La induced the expression of auxin biosynthesis-related genes, it markedly repressed primary root (PR) elongation by reducing auxin accumulation in PR tips. In this study, we exhibited that La reduces the abundances of auxin carriers. Treatment with La markedly inhibited the auxins IAA-, 2,4-D-, and NAA-induced elevation of DR5:GUS activity in the roots, suggesting that La inhibited auxin transport through both the influx and efflux transporters...
2017: Frontiers in Plant Science
Shuoxun Dong, Yili Wang, Yiwen Zhao, Xiaohui Zhou, Huaili Zheng
In this study, La(3+)(ion)/La(OH)3-W/La(OH)3-EW-loaded magnetic cationic hydrogel (MCH) composites were fabricated in situ and characterized to investigate the effects of lanthanum species on phosphate adsorption. The corresponding maximum P adsorption capacities of MCH-loaded La(3+)(ion) (MCH-La(3+)(ion)), La(OH)3-W (MCH-La(OH)3-W), and La(OH)3-EW (MCH-La(OH)3-EW) were 70.5 ± 2.67, 69.2 ± 3.5, and 90.2 ± 2.9 mg P/g, respectively. Furthermore, for MCH-La(OH)3-EW, the P adsorption capacity was maintained relatively stable and high at pH 4...
September 28, 2017: Water Research
Enza Di Gregorio, Giuseppe Ferrauto, Chiara Furlan, Stefania Lanzardo, Raffaele Nuzzi, Eliana Gianolio, Silvio Aime
OBJECTIVES: The aim of the study was to explore the role of the stability of metal complexes in the processes that lead to the metal retention in the brain and other tissues of mice administered with lanthanides-based contrast agents. This issue was tackled by the simultaneous injection of gadolinium (Gd)-diethylentriamminopentaacetate (DTPA) and lanthanum-DTPA, which have the same charge and structure but differ in their thermodynamic stability by 3 orders of magnitude. MATERIALS AND METHODS: A total of 20 healthy BALB/c mice were administered by a single intravenous injection with a dose consisting of 0...
October 3, 2017: Investigative Radiology
Zhe Lü, Jingwei Li, Bo Wei, Zhiqun Cao, Xing Yue, Yaxin Zhang
A novel Nb-doped lanthanum strontium ferrite perovskite oxide La0.8Sr0.2Fe0.9Nb0.1O3-δ (LSFNb) is evaluated as anode material of solid oxide fuel cell (SOFC). The effects of Nb partial substitution on the crystal structure, electrical conductivity and valence of Fe ions are studied. A good structural stability of LSFNb in severe reducing atmosphere at 800 °C is found, suggesting that high valent Nb can effectively promote the stability of lattice structure. The ratio of Fe2+ increases after Nb doping as confirmed by the results of XPS...
October 4, 2017: ChemSusChem
Qi Ming Zou, Lei Min Deng, Da Wei Li, Yun Shen Zhou, Hossein Rabiee Golgir, Kamran Keramatnejad, Li Sha Fan, Lan Jiang, Jean-Francois Silvain, Yong Feng Lu
Traditional ceramic-based, high-temperature electrode materials (e.g., lanthanum chromate) are severely limited due to their conditional electrical conductivity and poor stability under harsh circumstances. Advanced composite structures based on vertically aligned carbon nanotubes (VACNTs) and high-temperature ceramics are expected to address this grand challenge, in which ceramic serves as a shielding layer protecting the VACNTs from the oxidation and erosive environment, while the VACNTs work as a conductor...
October 12, 2017: ACS Applied Materials & Interfaces
Neel Haldolaarachchige, Leslie M Schoop, Mojammel Khan, Wenxuan Huang, Huiwen Ji, Kalani Hettiarachchilage, David P Young
The electronic properties of the heavy metal superconductor LaIr3 are reported. The estimated superconducting parameters obtained from physical properties measurements indicate that LaIr3 is a BCS-type superconductor. Electronic band structure calculations show that Ir d-states dominate the Fermi level. A comparison of electronic band structures of LaIr3 and LaRh3 shows that the Ir-compound has a strong spin-orbit-coupling effect, which creates a complex Fermi surface.
October 3, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Olivier Masson, Abid Berghout, Emilie Béchade, Jenny Jouin, Philippe Thomas, Toru Asaka, Koichiro Fukuda
The local structure of apatite-type lanthanum silicates of general formula La9.33+x(SiO4)6O2+3x/2 has been investigated by combining the atomic pair distribution function (PDF) method, conventional X-ray and neutron powder diffraction (NPD) data and density functional theory (DFT) calculations. DFT was used to build structure models with stable positions of excess oxide ions within the conduction channel. Two stable interstitial positions were obtained in accordance with literature, the first one located at the very periphery of the conduction channel, neighbouring the SiO4 tetrahedral units, and the second one closer to the channel axis...
2017: Science and Technology of Advanced Materials
Nedra Badri, Adrian Florea, Maroua Mhamdi, Horea Matei, Walid-Habib Tekaya, Rym Bâati, Samira Maghraoui, Leila Tekaya
Rare earths have been widely used in a huge number of areas in industry and medicine. Therefore, they exist in the environment and possibly accumulated within the human body. However their effects in the living organism particularly in the female reproductive system are still unclear. In this work, the subcellular behavior of lanthanum and cerium was investigated through the Transmission Electron Microscopy (TEM), in different territories of the reproductive system of Wistar rats exposed intraperitoneally to soluble solution of these elements during 2 weeks...
December 2017: Journal of Trace Elements in Medicine and Biology
Keenan N Woods, Milana C Thomas, Gavin Mitchson, Jeffrey Ditto, Can Xu, Donna Kayal, Kathleen C Frisella, Torgny Gustafsson, Eric Garfunkel, Yves J Chabal, David C Johnson, Catherine J Page
Metal oxide thin films are ubiquitous in technological applications. Often, multiple metal components are used to achieve desired film properties for specific functions. Solution deposition offers an attractive route for producing these multi-metal oxides because it allows for careful control of film composition through the manipulation of precursor stoichiometry. Although it has been generally assumed that homogeneous precursor solutions yield homogeneous thin films, we recently reported evidence of non-uniform electron density profiles in aqueous-deposited films...
September 29, 2017: ACS Applied Materials & Interfaces
Long Xu, Jingwen Zhang, Hua Zhao, Haibin Sun, Caixia Xu
Quasi-period cylindrical nanostructures with both diameters and intervals of about 100 nm are manufactured on the surfaces of Nd(3+)-doped lanthanum lead zirconate titanate ceramics by femtosecond laser irradiation under SF6 atmosphere. A light-emission enhancement of more than 20 times is investigated, accompanied by an extremely long trailing-off time of light emission and lower threshold. A specific polarization state of the light emission is achieved and tuned by changing the incident regions of the pumping source...
September 1, 2017: Optics Letters
V M Kalita, D M Polishchuk, D G Kovalchuk, A V Bodnaruk, S O Solopan, A I Tovstolytkin, S M Ryabchenko, A G Belous
Magnetic nanoparticles constitute promising tools for addressing medical and health-related issues based on the possibility to obtain various kinds of responses triggered by safe remote stimuli. However, such richness can be detrimental if different performances are not adequately differentiated and controlled. The aim of this work is to understand and systemize different kinds of magnetic-field-induced response for an ensemble of lanthanum-strontium manganite nanoparticles, which are considered as promising materials for self-controlled magnetic hyperthermia...
October 11, 2017: Physical Chemistry Chemical Physics: PCCP
Xueqin Lang, Haiyang Mo, Xiaoying Hu, Hongwei Tian
In this study, Sr-doped lanthanum manganite perovskites (La1-xSrxMnO3, LSM) as electrode materials for supercapacitors were prepared via an improved sol-gel method. Among LSM, the x = 0.15 sample shows superior electrochemical performance, delivering the highest specific capacitance of 102 F g(-1) at a current density of 1 A g(-1) and lower intrinsic resistance in 1 M KOH. The effective charge storage of LSM is due to the redox reaction of the anion intercalation corresponding to the surface redox processes of Mn(2+)/Mn(3+) and Mn(3+)/Mn(4+) occurring within the electroactive materials...
October 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Alessandro Benedetto, Claudia Bocca, Paola Brizio, Stefania Cannito, Maria Cesarina Abete, Stefania Squadrone
Human HT-29 and HepG2 cell lines were employed to test the effects of increasing concentrations of two rare earth elements (REEs), namely cerium (Ce) and lanthanum (La), alone or in combination. Effects on cell proliferation were measured using MTT assay, luciferase-based assays and proliferating cell nuclear antigen expression, while cell mortality and type of cell death was determined by Annexin V-FTC test using flow cytometry. Modulation of 84 genes involved in oxidative stress pathways was also studied using RT-PCR based arrays...
September 24, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
Baile Wu, Liping Fang, John D Fortner, Xiaohong Guan, Irene M C Lo
The use of lanthanum (La)-based materials for phosphate removal from water and wastewater has received increasing attention. However, challenges remain to enhance phosphate sorption capacities and recover La-based sorbents. In this study, magnetic La(OH)3/Fe3O4 nanocomposites with varied La-to-Fe mass ratios were synthesized through a precipitation and hydrothermal method. Based upon preliminary screening of synthesized La(OH)3/Fe3O4 nanocomposites in terms of phosphate sorption capacity and La content, La(OH)3/Fe3O4 nanocomposite with a La-to-Fe mass ratio of 4:1 was chosen for further characterization and evaluation...
September 20, 2017: Water Research
Marco Schleutker, Jochen Bahner, Chih-Long Tsai, Detlef Stolten, Carsten Korte
The Li(+) ion transfer between a solid and a liquid Li(+) electrolyte has been investigated by DC polarisation techniques. The current density i is measured as a function of the electrochemical potential drop Δ[small mu, Greek, tilde]Li(+) at the interface, using a liquid electrolyte with different Li(+) concentrations. The subject of this experimental study is the interface between the solid electrolyte Ta-substituted lithium lanthanum zirconate (Li6.6La3Zr1.6Ta0.4O12) and a liquid electrolyte consisting of LiPF6 dissolved in ethylene carbonate/dimethyl carbonate (1 : 1)...
October 11, 2017: Physical Chemistry Chemical Physics: PCCP
S M Shugurov, O Yu Kurapova, S I Lopatin, V G Konakov, E A Vasil'eva
RATIONALE: Zirconia doped with a lanthanum oxide system is of high interest due to its exceptional thermal stability for the development of high performance ceramics. It possesses the beneficial properties of pure zirconia, such as heat resistance, mechanical strength and inertness, but also eliminates its main disadvantage, i.e. brittleness. At high temperatures, components of such systems may vaporize selectively, leading to significant change in composition, and hence, the thermal resistance, phase stability and performance of the ceramic materials...
September 20, 2017: Rapid Communications in Mass Spectrometry: RCM
Li-Hua Bian, Lin Zou, Bing-Qian Zhou, Wei Liu, Jie Zhou, Xiao Wang
The effect of Lanthanum on the accumulation of active constituent and key enzymes expression of Salvia miltiorrhiza hairy root were studied and furthermore signaling molecules mediating the synthesis of secondary metabolism was also defined in order to provide references for the reveal of synthesis mechanism of active constituent of S. miltiorrhiza hairy root inducing by Lanthanum. The content of active constituents were detected by HPLC. RNA was extracted with RNA prep Pure RNA purification kit (Tiangen). The results shows that LaCl3 processing promoted the accumulation of tanshinones and phenolic acids in S...
December 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
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