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Takayuki Hamano
Despite the advent of cinacalcet and noncalcium-containing phosphate binders, controlling the progression of vascular calcification (VC) is still challenging. Recent reports demonstrate that carbamylation driven by high urea concentration aggravates VC, suggesting the importance of adequate dialysis in retarding its progression. Theoretically, other promising measures include the use of iron-based phosphate binders, vitamin K, and magnesium supplements, which should be investigated in future randomized controlled trials (RCTs), ideally with hard outcomes...
June 13, 2018: Seminars in Dialysis
Qiuhong Tan, Qianjin Wang, Yingkai Liu
Multiferroic materials have been receiving attention for their potential applications in multifunctional devices. Chemical substitution is an effective method for improving the physical properties of BiFeO₃ (BFO). However, different experimental results have been reported for Lanthanum- (La-) and Manganese (Mn) -doped BFO ceramics. Here, we systematically studied the magnetic properties and spontaneous polarization of La-, Mn-, and Nitrogen (N) -doped tetragonal BiFeO₃ using density functional theory with the generalized gradient approximation and U-value method...
June 11, 2018: Materials
Qing Chang, Feng-Wei Diao, Qi-Fan Wang, Liang Pan, Zhen-Hua Dang, Wei Guo
Multiple contaminants can affect plant-microbial remediation processes because of their interactive effects on environmental behaviour, bioavailability and plant growth. Recent studies have suggested that arbuscular mycorrhizal fungi (AMF) can facilitate the revegetation of soils co-contaminated with rare earth elements (REEs) and heavy metals. However, little is known regarding the role of AMF in the interaction of REEs and heavy metals. A pot experiment was conducted to evaluate the effects of Claroideoglomus etunicatum on the biomass, nutrient uptake, metal uptake and translocation of maize grown in soils spiked with Lanthanum (La) and Cadmium (Cd)...
June 4, 2018: Environmental Pollution
Peng Xiao, Junhua Huang, Ting Dong, Jianing Xie, Jian Yuan, Dongxiang Luo, Baiquan Liu
For the first time, compounds with lanthanum from the main family element Boron (LaBx ) were investigated as an active layer for thin-film transistors (TFTs). Detailed studies showed that the room-temperature fabricated LaBx thin film was in the crystalline state with a relatively narrow optical band gap of 2.28 eV. The atom ration of La/B was related to the working pressure during the sputtering process and the atom ration of La/B increased with the increase of the working pressure, which will result in the freer electrons in the LaBx thin film...
June 6, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Liqiang Zhao, Lei Liu
Anthropogenic lanthanum predominantly derived from a point source has become an emerging contaminant in the Rhine River, but little is known about its ecotoxicological consequences on bivalve mollusks. A fundamental requirement of aquatic invertebrate adaptation and survival in stressful habitats is the maintenance of energy homeostasis. As such, the present study tested the impact of four dissolved La concentrations (0, 50, 100 and 200 μM) on the energy balance of the bivalve Corbicula fluminea in the Rhine River...
June 4, 2018: Science of the Total Environment
Shaghayegh Jabariyan, Mohammad A Zanjanchi, Majid Arvand, Shabnam Sohrabnezhad
In this study, lanthanum-containing mesoporous MCM-41 (La-MCM-41) with different amount of lanthanum were synthesized and were used for colorimetric detection of glucose. As prepared La-MCM-41 were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The quantitative amounts of incorporated lanthanum into MCM-41 structure were estimated by energy dispersive X-ray spectrometry. The prepared La-MCM-41 provided high intrinsic peroxidase-like activity in the presence of peroxidise 3,3',5,5'-tetramethylbenzidine (TMB) and H2 O2 for accurate determination of glucose...
April 26, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Jie Wu, Jinghua Yang, Xiaobo Lu, Cuihong Jin, Shengwen Wu, Lijin Zhang, Xiaoyu Hu, Honglin Ma, Yuan Cai
Lanthanum could cause cognitive impairment in children and rodent animals. The normal blood-brain barrier (BBB) integrity is essential for protecting the brain from systemic toxins and maintaining the homeostasis for proper neuronal function. BBB dysfunction has been implicated as a potential mechanism of heavy metal-induced neurotoxicity. The present study was aimed to investigate effects of lanthanum on BBB integrity and endothelial junctional complexes in the cerebral cortex of young rats. Animals were exposed to lanthanum chloride (LaCl3 ) through drinking water under 0, 0...
June 6, 2018: Biological Trace Element Research
V Minganti, G Drava
Although rare earth elements (REEs) are important in modern industry, few processes use them, so the possibility of these elements being dispersed in the environment is small. For this reason, there are few studies on their presence in urban environments. REEs exhibit similar chemical properties, and Group 3 elements may be used as indicators of the presence of other REEs in the environment. Tree bark is a suitable collector of airborne trace elements and has been successfully used as a bioindicator. In this study, samples of holm oak bark were collected from three sampling sites subjected to different anthropic pressures (one area is far from human influence, while the other two sites are urban areas characterized by different types of human impact)...
February 2018: Chemosphere
Noriaki Maruyama, Tomoyasu Otsuki, Yoshinori Yoshida, Chinami Nagura, Maki Kitai, Nami Shibahara, Hyoe Tomita, Takashi Maruyama, Masanori Abe
BACKGROUND: Serum phosphate and vitamin D receptor activator regulate fibroblast growth factor 23 (FGF23), and iron may modulate FGF23 metabolism. The aim of the present study was to elucidate the effects of ferric citrate hydrate and lanthanum carbohydrate on serum FGF23 levels in hemodialysis patients. METHODS: This prospective, open-label, multicenter study enrolled 60 patients on hemodialysis treated with lanthanum carbonate. Patients were randomly assigned to 2 groups: those switching from lanthanum carbonate to ferric citrate hydrate (ferric citrate group, n = 30) or those continuing lanthanum carbonate (control group, n = 30)...
June 6, 2018: American Journal of Nephrology
Mikhail E Minyaev, Sof'ya A Korchagina, Alexander N Tavtorkin, Andrei V Churakov, Ilya E Nifant'ev
The reactions of K[(2,6-i Pr2 C6 H3 -O)2 POO] either with LaCl3 (H2 O)7 or with Nd(NO3 )3 (H2 O)6 in a 3:1 molar ratio, followed by vacuum drying and recrystallization from alkanes, have led to the formation of diaquapentakis[bis(2,6-diisopropylphenyl) phosphato]-μ-hydroxido-dilanthanum hexane disolvate, [La2 (C24 H34 O4 P)5 (OH)(H2 O)2 ]·2C6 H14 , (1)·2(hexane), and tetraaquatetrakis[bis(2,6-diisopropylphenyl) phosphato]-μ-hydroxido-dineodymium bis(2,6-diisopropylphenyl) phosphate heptane disolvate, [Nd2 (C24 H34 O4 P)4 (OH)(H2 O)4 ]·2C6 H14 , (2)·2(heptane)...
June 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
Hai Qin Fang, Zhou Yu, Yuan Zhi, Jin Fang, Chen Xi Li, Yi Mei Wang, Shuang Qing Peng, Xu Dong Jia
OBJECTIVE: The present study was undertaken to evaluate the subchronic toxicity of lanthanum and to determine the no observed adverse effect level (NOAEL), which is a critical factor in the establishment of an acceptable dietary intake (ADI). METHODS: In accordance with the Organization for Economic Co-operation and Development (OECD) testing guidelines, lanthanum nitrate was administered once daily by gavage to Sprague-Dawley (SD) rats at dose levels of 0, 1.5, 6...
May 2018: Biomedical and Environmental Sciences: BES
Daniel Rasic, Ritesh Sachan, Namik Kemal Temizer, John Prater, Jagdish Narayan
The multiferroic properties of mixed valence perovskites such as lanthanum strontium manganese oxide (La¬0.7Sr0.3MnO3) demonstrate a unique dependence on oxygen concentration, thickness, strain and orientation. To better understand the role of each variable, a systematic study has been performed. In this study, epitaxial growth of LSMO (110) thin films with thicknesses ~15nm are reported on epitaxial magnesium oxide (111) buffered Al2O3 (0001) substrates. Four LSMO films with changing oxygen concentration have been investigated...
June 4, 2018: ACS Applied Materials & Interfaces
Xiang-Kui Gu, Juliana S A Carneiro, Samji Samira, Anirban Das, Nuwandi Ariyasingha, Eranda Nikolla
Oxygen electrocatalysis plays a critical role in the efficiency of important energy conversion and storage systems. While many efforts have focused on designing efficient electrocatalysts for these processes, optimal catalysts that are inexpensive, active, selective and stable are still being searched. Nonstoichiometric, mixed metal oxides present a promising group of electrocatalysts for these processes due to the versatility of the surface composition and fast oxygen conducting properties. Herein, we demonstrate using a combination of theoretical and experimental studies the ability to develop design principles that can be used to engineer oxygen electrocatalysis activity of layered, mixed ionic-electronic conducting Ruddlesden-Popper (R-P) oxides...
May 30, 2018: Journal of the American Chemical Society
Hsuan-Chieh Peng, Gregory P Walker
Feeding behavior and plant response to feeding were studied for the aphid Aphis gossypii (Glover) on susceptible and resistant melons (cv. Iroquois and TGR-1551, respectively). Average phloem phase bout duration on TGR-1551 was <7% of the duration on Iroquois. Sixty-seven percent of aphids on TGR-1551 never produced a phloem phase that attained ingestion (EPG waveform E2) in contrast to only 7% of aphids on Iroquois. Average bout duration of waveform E2 (scored as zero if phloem phase did not attain E2) on TGR-1551 was <3% of the duration on Iroquois...
May 30, 2018: Insect Science
Masaya Iwamuro, Haruo Urata, Takehiro Tanaka, Seiji Kawano, Yoshiro Kawahara, Katsuhiko Kimoto, Hiroyuki Okada
OBJECTIVE: Although lanthanum deposition in the stomach has been most frequently reported to occur as white lesions, no study has investigated whether the white lesions observed during esophagogastroduodenoscopy are truly lanthanum-related. Here, we retrospectively investigated the amount of lanthanum in endoscopic biopsy specimens. METHODS: We reviewed four patients showing gastric white spots or annular whitish mucosa in the gastric white lesions (Bw) and peripheral mucosa where the white substance was not endoscopically observed (Bp) during biopsy...
May 23, 2018: Pathology, Research and Practice
A Funes, F J Martínez, I Álvarez-Manzaneda, J M Conde-Porcuna, J de Vicente, F Guerrero, I de Vicente
Phosphorus (P) removal from lake/drainage waters by novel adsorbents may be affected by competitive substances naturally present in the aqueous media. Up to date, the effect of interfering substances has been studied basically on simple matrices (single-factor effects) or by applying basic statistical approaches when using natural lake water. In this study, we determined major factors controlling P removal efficiency in 20 aquatic ecosystems in the southeast Spain by using linear mixed models (LMMs). Two non-magnetic -CFH-12® and Phoslock® - and two magnetic materials -hydrous lanthanum oxide loaded silica-coated magnetite (Fe-Si-La) and commercial zero-valent iron particles (FeHQ)- were tested to remove P at two adsorbent dosages...
May 17, 2018: Water Research
Meenakshi Joshi, Aditi Chandrasekar, Tapan K Ghanty
The positions of lawrencium (Lr), lutetium (Lu), actinium (Ac) and lanthanum (La) in the periodic table have been a controversial topic for quite some time. According to studies carried out by different groups with their justifications, these elements may potentially be placed in the d-block, p-block or all four in a 15 element f-block. The present work looks into this issue from a new perspective, which involves encapsulation of these four elements into Zintl ion clusters, Pb122- and Sn122-, followed by the determination of the structural, thermodynamic and electronic properties of these endohedral M@Pb122- and M@Sn122- clusters (M = Lrn+, Lun+ with n = 0, 1, 2, 3) using first principles based density functional theory (DFT)...
May 23, 2018: Physical Chemistry Chemical Physics: PCCP
Muhammad Nazar Aftab, Irum Naz Akram, Tafheem Khosa, Syeda Qandeel Zahra, Irum Bashir, Muhammad Naeem Ashiq, Furhan Iqbal
Lanthanum Zirconate nanoparticles (NPs) are used in blades of gas turbine engines to thermally insulate them and to protect them against hot and corrosive gas streams. However, the information regarding their biocompatibility is limited. The present study was aimed to report the effect of Lanthanum Zirconate NPs on selected aspects of behavior, serum biochemistry, complete blood count and antioxidant parameters from vital organs of albino mice in a gender specific manner. Albino mice, seven weeks old, were orally treated with 75 mg/ml solvent/Kg body weight of Lanthanum Zirconate nanoparticles for consecutive 22 days...
May 21, 2018: Metabolic Brain Disease
Fabio Carfagna, Lucia Del Vecchio, Giuseppe Pontoriero, Francesco Locatelli
Hyperphosphatemia is common in late stages of chronic kidney disease and is often associated with elevated parathormone levels, abnormal bone mineralization, extra-osseous calcification, and increased risk of cardiovascular events and death. Several classes of oral phosphate binders are available to help control plasma phosphorus levels. Although effective at lowering serum phosphorus, they all have safety, tolerability, and compliance issues that need to be considered when selecting which one to use. Areas covered: This paper reviews the most established treatment options for hyperphosphatemia, in patients with chronic kidney disease, focusing on the new inhibitors of active phosphate absorption...
May 21, 2018: Expert Opinion on Drug Safety
Kenichi Kaminaga, Daichi Oka, Tetsuya Hasegawa, Tomoteru Fukumura
We report superconducting transition in LaO epitaxial thin film with the onset of superconducting transition temperature ( Tc ) at around 5 K. The Tc is the highest among lanthanum monochalcogenides opposite to the chemical trend of their Tc : 0.84, 1.02, and 1.48 K for La X ( X = S, Se, Te), respectively. The carrier control resulted in a dome-shaped Tc as a function of electron carrier density. In addition, the Tc was significantly sensitive to epitaxial strain in spite of its highly symmetric crystal structure...
May 21, 2018: Journal of the American Chemical Society
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