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Lanthanum

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https://www.readbyqxmd.com/read/28637791/store-operated-calcium-entry-suppressed-tgf%C3%AE-1-smad3-signaling-pathway-in-glomerular-mesangial-cells
#1
Sarika Chaudhari, Weizu Li, Yanxia Wang, Hui Jiang, Yuhong Ma, Mark E Davis, Jonathan E Zuckerman, Rong Ma
Our previous study demonstrated that the abundance of extracellular matrix proteins was suppressed by store-operated Ca2+ entry in mesangial cells (MCs). The present study was conducted to investigate the underlying mechanism focused on the transforming growth factor beta 1 (TGFβ1) - Smad3 pathway, a critical pathway for ECM expansion in diabetic kidneys. We hypothesized that SOCE suppressed ECM protein expression by inhibiting this pathway in MCs. In cultured human MCs, we observed that TGFβ1 (5 ng/ml for 15 hours) significantly increased Smad3 phosphorylation as evaluated by immunoblot...
June 21, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28630919/discovery-of-lorentz-violating-type-ii-weyl-fermions-in-laalge
#2
Su-Yang Xu, Nasser Alidoust, Guoqing Chang, Hong Lu, Bahadur Singh, Ilya Belopolski, Daniel S Sanchez, Xiao Zhang, Guang Bian, Hao Zheng, Marious-Adrian Husanu, Yi Bian, Shin-Ming Huang, Chuang-Han Hsu, Tay-Rong Chang, Horng-Tay Jeng, Arun Bansil, Titus Neupert, Vladimir N Strocov, Hsin Lin, Shuang Jia, M Zahid Hasan
In quantum field theory, Weyl fermions are relativistic particles that travel at the speed of light and strictly obey the celebrated Lorentz symmetry. Their low-energy condensed matter analogs are Weyl semimetals, which are conductors whose electronic excitations mimic the Weyl fermion equation of motion. Although the traditional (type I) emergent Weyl fermions observed in TaAs still approximately respect Lorentz symmetry, recently, the so-called type II Weyl semimetal has been proposed, where the emergent Weyl quasiparticles break the Lorentz symmetry so strongly that they cannot be smoothly connected to Lorentz symmetric Weyl particles...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28630301/potential-high-tc-superconducting-lanthanum-and-yttrium-hydrides-at-high-pressure
#3
Hanyu Liu, Ivan I Naumov, Roald Hoffmann, N W Ashcroft, Russell J Hemley
A systematic structure search in the La-H and Y-H systems under pressure reveals some hydrogen-rich structures with intriguing electronic properties. For example, LaH10 is found to adopt a sodalite-like face-centered cubic (fcc) structure, stable above 200 GPa, and LaH8 a C2/m space group structure. Phonon calculations indicate both are dynamically stable; electron phonon calculations coupled to Bardeen-Cooper-Schrieffer (BCS) arguments indicate they might be high-Tc superconductors. In particular, the superconducting transition temperature Tc calculated for LaH10 is 274-286 K at 210 GPa...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28616234/all-that-glitters-is-not-gold-a-case-of-lanthanum-carbonate-aspiration
#4
Suchitra Paranji, Neethi Paranji, Adam S Weltz
INTRODUCTION: Foreign body aspiration is a significant cause of morbidity and mortality in elderly hospitalized patients. These are typically small items that patients have access to, including small coins. CASE PRESENTATION: This is a case report of a 75-year-old man recently bedridden from a large hemispheric stroke with sudden onset of hoarseness, cough and dysphagia. A chest X-ray was obtained which showed a radiopaque coin-shaped foreign body, presumably a coin in his aerodigestive tract...
2017: SAGE open medical case reports
https://www.readbyqxmd.com/read/28612144/fast-calcium-transients-translate-the-distribution-and-conduction-of-neural-activity-in-different-regions-of-a-single-sensory-neuron
#5
Nuhan Purali
In the present study, cytosolic calcium concentration changes were recorded in response to various forms of excitations, using the fluorescent calcium indicator dye OG-BAPTA1 together with the current or voltage clamp methods in stretch receptor neurons of crayfish. A single action potential evoked a rise in the resting calcium level in the axon and axonal hillock, whereas an impulse train or a large saturating current injection would be required to evoke an equivalent response in the dendrite region. Under voltage clamp conditions, amplitude differences between axon and dendrite responses vanished completely...
September 2017: Invertebrate Neuroscience: IN
https://www.readbyqxmd.com/read/28599163/effects-of-combined-flocculant-lanthanum-modified-bentonite-treatment-on-aquatic-macroinvertebrate-fauna
#6
G Waajen, M Pauwels, M Lürling
A low dose flocculant (FeCl3), combined with lanthanum modified bentonite (LMB) as phosphate-binding agent, has been applied for eutrophication management in Lake De Kuil (The Netherlands). After the treatment, the state of the lake shifted from hypertrophic to mesotrophic. Although macroinvertebrate fauna is important for lake ecosystems, the knowledge of its response to this lake restoration method is fragmented and scarce. Because insight in the macroinvertebrate fauna response is important to assess future applications, pre and post application macroinvertebrate assemblages were identified in Lake De Kuil...
June 2, 2017: Water Research
https://www.readbyqxmd.com/read/28598977/coagulant-plus-ballast-technique-provides-a-rapid-mitigation-of-cyanobacterial-nuisance
#7
Natalia P Noyma, Leonardo de Magalhães, Marcela Miranda, Maíra Mucci, Frank van Oosterhout, Vera L M Huszar, Marcelo M Marinho, Eduardo R A Lima, Miquel Lürling
Cyanobacteria blooms are a risk to environmental health and public safety due to the potent toxins certain cyanobacteria can produce. These nuisance organisms can be removed from water bodies by biomass flocculation and sedimentation. Here, we studied the efficacy of combinations of a low dose coagulant (poly-aluminium chloride-PAC-or chitosan) with different ballast compounds (red soil, bauxite, gravel, aluminium modified zeolite and lanthanum modified bentonite) to remove cyanobacterial biomass from water collected in Funil Reservoir (Brazil)...
2017: PloS One
https://www.readbyqxmd.com/read/28598575/an-efficient-and-versatile-catalyst-for-carbon-dioxide-fixation-into-cyclic-carbonates
#8
Antonio Otero, Javier Martinez, Juan Fernandez-Baeza, Luis F Sanchez-Barba, Jose A Castro-Osma, Agustin Lara-Sanchez
A new heteroscorpionate lanthanum complex has shown exceptional catalytic activity for the synthesis of cyclic carbonates from epoxides and carbon dioxide. The new catalyst system also promotes the reaction of bio-based epoxides to give an important class of bis(cyclic carbonates) that can be further used for the production of bio-derived non-isocyanate polyurethanes. The catalytic process requires low catalyst loading and mild reaction conditions for the synthesis of a wide range of cyclic carbonates.
June 9, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28598143/composite-polymer-electrolytes-with-li7la3zr2o12-garnet-type-nanowires-as-ceramic-fillers-mechanism-of-conductivity-enhancement-and-role-of-doping-and-morphology
#9
Ting Yang, Jin Zheng, Qian Cheng, Yan Yan Hu, Candace K Chan
Composite polymer solid electrolytes (CPEs) containing ceramic fillers embedded inside a polymer-salt matrix show great improvements in Li+ ionic conductivity compared to the polymer electrolyte alone. Lithium lanthanum zirconate (Li7La3Zr2O12, LLZO) with garnet-type crystal structure is a promising solid Li+ conductor. We show that by incorporating only 5 wt% of ceramic filler comprising undoped, cubic-phase LLZO nanowires prepared by electrospinning, the room temperature ionic conductivity of a polyacrylonitrile-LiClO4-based composite is increased 3 orders of magnitude to 1...
June 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28588261/persistent-effects-of-the-yellow-river-on-the-chinese-marginal-seas-began-at-least-880%C3%A2-ka-ago
#10
Zhengquan Yao, Xuefa Shi, Shuqing Qiao, Qingsong Liu, Selvaraj Kandasamy, Jianxing Liu, Yanguang Liu, Jihua Liu, Xisheng Fang, Jingjing Gao, Yanguang Dou
The Yellow River (or Huanghe and also known as China's Sorrow in ancient times), with the highest sediment load in the world, provides a key link between continental erosion and sediment accumulation in the western Pacific Ocean. However, the exact age of its influence on the marginal sea is highly controversial and uncertain. Here we present high-resolution records of clay minerals and lanthanum to samarium (La/Sm) ratio spanning the past ~1 million years (Myr) from the Bohai and Yellow Seas, the potential sedimentary sinks of the Yellow River...
June 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28585261/discovery-of-rapid-and-reversible-water-insertion-in-rare-earth-sulfates-a-new-process-for-thermochemical-heat-storage
#11
Naoyuki Hatada, Kunihiko Shizume, Tetsuya Uda
Thermal energy storage based on chemical reactions is a prospective technology for the reduction of fossil-fuel consumption by storing and using waste heat. For widespread application, a critical challenge is to identify appropriate reversible reactions that occur below 250 °C, where abundant low-grade waste heat and solar energy might be available. Here, it is shown that lanthanum sulfate monohydrate La2 (SO4 )3 ⋅H2 O undergoes rapid and reversible dehydration/hydration reactions in the temperature range from 50 to 250 °C upon heating/cooling with remarkably small thermal hysteresis (<50 °C), and thus it emerges as a new candidate system for thermal energy storage...
June 6, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28585011/preparation-of-la-modified-magnetic-composite-for-enhanced-adsorptive-removal-of-tetracycline
#12
Xiao Mi, Mingju Wang, Fengyi Zhou, Xiaoqi Chai, Weiqiang Wang, Feifei Zhang, Shanru Meng, Yaqing Shang, Weigao Zhao, Guoting Li
Composite adsorbents usually outperform single component adsorbents as they could combine the properties and advantages of each component. In this research, rare earth element Lanthanum was introduced into magnetic substrate by a method of chemical co-precipitation to enhance its adsorption capability. It was found that the La-modified magnetic composite with a presumed La and Fe3O4 molar ratio at 1:50 had a better adsorption performance for tetracycline than the magnetic adsorbents at other molar ratios. The La-modified magnetic composite was characterized by scanning electron microscope, X-ray diffractometer, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy...
June 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28584909/a-review-of-phosphate-binders-in-chronic-kidney-disease-incremental-progress-or-just-higher-costs
#13
REVIEW
Wendy L St Peter, Lori D Wazny, Eric Weinhandl, Katie E Cardone, Joanna Q Hudson
As kidney disease progresses, phosphorus retention also increases, and phosphate binders are used to treat hyperphosphatemia. Clinicians prescribe phosphate binders thinking that reducing total body burden of phosphorus may decrease risks of mineral and bone disorder, fractures, cardiovascular disease, progression of kidney disease, and mortality. Recent meta-analyses suggest that sevelamer use results in lower mortality than use of calcium-containing phosphate binders. However, studies included in meta-analyses show significant heterogeneity, and exclusion or inclusion of specific studies alters results...
June 5, 2017: Drugs
https://www.readbyqxmd.com/read/28580780/monolithic-mid-infrared-integrated-photonics-using-silicon-on-epitaxial-barium-titanate-thin-films
#14
Tiening Jin, Leigang Li, Bruce Zhang Bzhang Gmail Com Zhang, Hao-Yu Greg Lin, Haiyan Wang, Pao Lin
Broadband mid-Infrared (mid-IR) photonic circuits that integrate silicon waveguides and epitaxial barium titanate (BTO) thin films are demonstrated using the complementary metal-oxide-semiconductor (CMOS) process. The epitaxial BTO thin films are grown on lanthanum aluminate (LAO) substrates by pulsed laser deposition (PLD) technique, where a broad infrared transmittance between λ = 2.5 µm to λ = 7 um is observed. The optical waveguiding direction is defined by the high refractive index amorphous Si (a-Si) ridge structure developed on the BTO layer...
June 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28571511/grain-boundary-engineering-for-aging-and-slow-crack-growth-resistant-zirconia
#15
F Zhang, J Chevalier, C Olagnon, M Batuk, J Hadermann, B Van Meerbeek, J Vleugels
Ceramic materials are prone to slow crack growth, resulting in strength degradation over time. Although yttria-stabilized zirconia (Y-TZP) ceramics have higher crack resistance than other dental ceramics, their aging susceptibility threatens their long-term performance in aqueous environments such as the oral cavity. Unfortunately, increasing the aging resistance of Y-TZP ceramics normally reduces their crack resistance. Our recently conducted systematic study of doping 3Y-TZP with various trivalent cations revealed that lanthanum oxide (La2O3) and aluminum oxide (Al2O3) have the most potent effect to retard the aging kinetics of 3Y-TZP...
March 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28569043/lanthanum-based-compounds-electronic-bandgap-dependent-electro-catalytic-materials-toward-oxygen-reduction-reaction
#16
Weiwei Gu, Ye Song, Jingjun Liu, Feng Wang
The electronic energy level of lanthanum compounds plays an important role in oxygen reduction reaction (ORR) electro-catalytic process. In this work, three lanthanum compounds, LaOHCO3, La2O2CO3 and La2O3, were synthesized via an in-situ urea hydrolysis method, followed by annealing at different temperatures. Among these lanthanum compounds, the layer-structured La2O2CO3 has the minimum bandgap and a moderate value of conduction band (CB) and valance band (VB). Electrochemical measurements in 0.1 M KOH solution show that compared with the other catalysts, La2O2CO3 exhibits the best electro-catalytic activity with lowest HO2- production and highest durability for ORR, which proves the close correlation between electronic energy level and electro-catalytic ORR activity...
May 31, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28561856/la-iii-biodistribution-profiles-from-intravenous-and-oral-dosing-of-two-lanthanum-complexes-la-dpp-3-and-la-xt-and-evaluation-as-treatments-for-bone-resorption-disorders
#17
D M Weekes, J F Cawthray, M Rieder, J Syeda, M Ali, E Wasan, T I Kostelnik, B O Patrick, A Panahifar, A Al-Dissi, D Cooper, K M Wasan, C Orvig
Trivalent lanthanum (La(3+)) has the potential to treat bone resorption disorders (such as osteoporosis) by eliciting a bone-building response in the cells which control skeletal remodelling. Because La(3+) suffers from extremely poor intestinal absorption, specifically designed chelators are required in order that a biologically active form of lanthanum can be administered orally. Two such chelators, 1,2-dimethyl-3-hydroxy-4-pyridinone (Hdpp) and bis-{[bis(carboxymethyl)amino]methy}phosphinic acid (H5XT), have previously been the subjects of extensive physical, in vitro, and in vivo testing as the tris- and mono-lanthanum(iii) complexes La(dpp)3 and La(XT), respectively...
May 31, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28526117/the-efficiency-of-combined-coagulant-and-ballast-to-remove-harmful-cyanobacterial-blooms-in-a-tropical-shallow-system
#18
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
https://www.readbyqxmd.com/read/28521220/synthesis-of-ordered-mesoporous-la2o3-zro2-composites-with-encapsulated-pt-nps-and-the-effect-of-la-dopping-on-catalytic-activity
#19
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)...
October 1, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28514699/profiling-of-illicit-cocaine-seized-in-china-by-icp-ms-analysis-of-inorganic-elements
#20
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
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