keyword
MENU ▼
Read by QxMD icon Read
search

Lanthanum

keyword
https://www.readbyqxmd.com/read/28214677/photo-degradation-of-basic-green-1-and-basic-red-46-dyes-in-their-binary-solution-by-la2o3-al2o3nanocomposite-using-first-order-derivative-spectra-and-experimental-design-methodology
#1
Bahareh Fahimirad, Alireza Asghari, Maryam Rajabi
In this work, the lanthanum oxide-aluminum oxide (La2O3-Al2O3) nanocomposite is introduced as an efficient photocatalyst for the photo-degradation of the dyes basic green 1 (BG1) and basic red 46 (BR46) in their binary aqueous solution under the UV light irradiation. The properties of this catalyst are determined by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Brunauer-Emmett-Teller (BET), and UV-visible spectrophotometry. The first-order derivative spectra are used for the simultaneous analysis of the dyes in their binary solution...
February 10, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28197559/strontium-cobalt-oxychlorides-enhanced-electrocatalysts-for-oxygen-reduction-and-evolution-reactions
#2
Yuto Miyahara, Kohei Miyazaki, Tomokazu Fukutsuka, Takeshi Abe
Cobalt-based layered perovskite oxychlorides Sr2CoO3Cl and Sr3Co2O5Cl2 exhibit high oxygen electrocatalytic activity compared to conventional lanthanum cobalt-based perovskite oxides. The enhanced oxygen electrocatalytic activity can be attributed to the upshifted O p-band center relative to the Fermi level caused by the incorporation of chloride anion into oxygen sites.
February 15, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28182142/elemental-calcium-intake-associated-with-calcium-acetate-calcium-carbonate-in-the-treatment-of-hyperphosphatemia
#3
Rosamund J Wilson, J Brian Copley
BACKGROUND: Calcium-based and non-calcium-based phosphate binders have similar efficacy in the treatment of hyperphosphatemia; however, calcium-based binders may be associated with hypercalcemia, vascular calcification, and adynamic bone disease. SCOPE: A post hoc analysis was carried out of data from a 16-week, Phase IV study of patients with end-stage renal disease (ESRD) who switched to lanthanum carbonate monotherapy from baseline calcium acetate/calcium carbonate monotherapy...
2017: Drugs in Context
https://www.readbyqxmd.com/read/28178588/investigation-of-the-complex-structure-comparative-dna-binding-and-dna-cleavage-of-two-water-soluble-mono-nuclear-lanthanum-iii-complexes-and-cytotoxic-activity-of-chitosan-coated-magnetic-nanoparticles-as-drug-delivery-for-the-complexes
#4
Zahra Asadi, Neda Nasrollahi, Hamidreza Karbalaei-Heidari, Vaclav Eigner, Michal Dusek, Nabiallah Mobaraki, Roya Pournejati
Two water-soluble mono-nuclear macrocyclic lanthanum(III) complexes of 2,6-diformyl-4-methylphenol with 1,3-diamino-2-propanol (C1) or 1,3-propylenediamine (C2) were synthesized and characterized by UV-Vis, FT-IR, (13)C and (1)H NMR spectroscopy and elemental analysis. C1 complex was structurally characterized by single-crystal X-ray diffraction, which revealed that the complex was mononuclear and ten-coordinated. The coordination sites around lanthanum(III) were occupied with a five-dentate ligand, two bidentate nitrates, and one water molecule...
January 21, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28158064/long-term-time-dependence-of-internal-stress-in-lanthanum-titanium-oxide-h4-optical-thin-films
#5
Masashi Takegami, Ryota Nakano, Hiroshi Murotani
The time variation in the internal stress of optical thin films composed of lanthanum titanium oxide (H4) deposited by ion-beam assisted deposition (IAD) and electron beam deposition was observed over a period of 10 years after deposition, and it was found that the internal stresses in the optical thin films can be controlled by optimizing the IAD conditions. Both tensile stress and compressive stress could be created by IAD, and the chemical bonding state of Ti may affect the stress behavior. The network size of the chemical bonds may affect the stress direction...
February 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28153426/factors-affecting-gastrointestinal-absorption-of-levothyroxine-a-review
#6
REVIEW
Marko Skelin, Tomo Lucijanić, Daniela Amidžić Klarić, Arnes Rešić, Miro Bakula, Ana-Marija Liberati-Čizmek, Hossein Gharib, Dario Rahelić
PURPOSE: Levothyroxine (LT4) is a drug with a narrow therapeutic index, applied in small amounts (micrograms), which makes interactions in the absorption phase clinically significant. The main aim of this article was to review and present the latest information on factors that affect the gastrointestinal absorption of this drug. METHODS: Relevant data were collected by using the MEDLINE, PubMed, EMBASE, Web of Science, Science Direct, and Scopus databases with the key words levothyroxine and absorption...
January 30, 2017: Clinical Therapeutics
https://www.readbyqxmd.com/read/28148453/optimizing-the-lanthanum-adsorption-process-onto-chemically-modified-biomaterials-using-factorial-and-response-surface-design
#7
Andreea Gabor, Corneliu Mircea Davidescu, Adina Negrea, Mihaela Ciopec, Ion Grozav, Petru Negrea, Narcis Duteanu
The rare metals' potential to pollute air, water, soil, and especially groundwater has received lot of attention recently. One of the most common rare earth group elements, lanthanum, is used in many industrial branches, and due to its toxicity, it needs to be eliminated from all residual aqueous solutions. The goal of this study was to evaluate the control of the adsorption process for lanthanum removal from aqueous solutions, using cellulose, a known biomaterial with high adsorbent properties, cheap, and environment friendly...
January 29, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28134986/lanthanum-deposition-from-oral-lanthanum-carbonate-in-the-upper-gastrointestinal-tract
#8
Raza S Hoda, Soma Sanyal, Jerrold L Abraham, Jamie M Everett, Gregory L Hundemer, Eric Yee, Gregory Y Lauwers, Nina Tolkoff-Rubin, Joseph Misdraji
AIMS: Lanthanum carbonate is used an alternative to calcium-based phosphate binders to manage hyperphosphatemia in patients with renal failure. The deposition of lanthanum within gastroduodenal mucosa of patients treated with the medication has been described, but given the relative novelty of this entity, the histiocytic deposits in the gastroduodenal mucosa can be confused with a variety of other processes, including infections and other drug-induced forms of injury. METHODS AND RESULTS: We describe 5 cases of lanthanum phosphate deposition in upper gastrointestinal tract biopsies...
January 30, 2017: Histopathology
https://www.readbyqxmd.com/read/28130979/gamma-gamma-coincidence-performance-of-labr3-ce-scintillation-detectors-vs-hpge-detectors-in-high-count-rate-scenarios
#9
A Drescher, M Yoho, S Landsberger, M Durbin, S Biegalski, D Meier, J Schwantes
A radiation detection system consisting of two cerium doped lanthanum bromide (LaBr3:Ce) scintillation detectors in a gamma-gamma coincidence configuration has been used to demonstrate the advantages that coincident detection provides relative to a single detector, and the advantages that LaBr3:Ce detectors provide relative to high purity germanium (HPGe) detectors. Signal to noise ratios of select photopeak pairs for these detectors have been compared to high-purity germanium (HPGe) detectors in both single and coincident detector configurations in order to quantify the performance of each detector configuration...
January 15, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28124565/spectroscopic-characterization-of-nonconcerted-4-2-cycloaddition-of-1-3-butadiene-with-lanthanacyclopropene-to-form-lanthanum-benzene-in-the-gas-phase
#10
Dilrukshi Hewage, Wenjin Cao, Jong Hyun Kim, Ya Wang, Yang Liu, Dong-Sheng Yang
The reaction between La atoms and 1,3-butadiene is carried out in a laser-vaporization molecular beam source. Metal-hydrocarbon species with formulas La(CnHn) (n = 2, 4, and 6) and La(CmHm+2) (m = 4 and 6) are observed with time-of-flight mass spectrometry and characterized with mass-analyzed threshold ionization spectroscopy. A lanthanum-benzene complex [La(C6H6)] is formed by 1,3-butadiene addition to lanthanacyclopropene [La(C2H2)] followed by molecular hydrogen elimination. Lanthanacyclopropene is an intermediate generated by the primary reaction between La and 1,3-butadiene...
February 6, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28115154/influences-of-lacl3-on-the-mineral-phase-transformation-during-osteoblast-mineralization-in-vitro
#11
Caixia Yu, Jiao Gong, Fu-Ling Yin, Jian Huang, Tian-Lan Zhang, Kui Wang
Rat calvarial osteoblasts were treated with lanthanum chloride (LaCl3) to explore its effect on the mineral crystalline phase during the process of osteoblast calcification in vitro. The results confirmed that La was readily deposited in the mineral component of the matrix. Employing high-resolution transmission electron microscopy and Fourier transform infrared microspectroscopy techniques, we demonstrated that features comparable to dicalcium phosphate dihydrate (DCPD) and octacalcium phosphate, and hydroxyapatite (HAP) were detected in the mineral phases in vitro...
January 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28103275/a-theoretical-model-for-predicting-residual-stress-generation-in-fabrication-process-of-double-ceramic-layer-thermal-barrier-coating-system
#12
Yan Song, Weijie Wu, Feng Xie, Yilun Liu, Tiejun Wang
Residual stress arisen in fabrication process of Double-Ceramic-Layer Thermal Barrier Coating System (DCL-TBCs) has a significant effect on its quality and reliability. In this work, based on the practical fabrication process of DCL-TBCs and the force and moment equilibrium, a theoretical model was proposed at first to predict residual stress generation in its fabrication process, in which the temperature dependent material properties of DCL-TBCs were incorporated. Then, a Finite Element method (FEM) has been carried out to verify our theoretical model...
2017: PloS One
https://www.readbyqxmd.com/read/28102388/crystal-structure-of-ba2-la0-727ba0-182m0-091-mo6-m-nb-sb-bi-symmetry-nuance-identified-in-photoluminescence-and-ir-spectroscopy-studies
#13
Rohan Phatak, Santosh K Gupta, Priya Maheshwari, Amitabh Das, Sanjay K Sali
A one-third lanthanum deficiency was created in Ba2LaM(5+)O6 compounds (LaM compounds) to form Ba2La2/3M(5+)O5.5 compounds (La2/3M compounds) for M = Nb, Sb, and Bi. The compounds were prepared by a gel-combustion method using citric acid as a fuel. All the compounds were characterized by powder X-ray diffraction (XRD). The XRD analysis showed that the space group of the La2/3M compounds remains the same for the Bi and Sb samples when compared to the reported LaM compounds, except for the Nb sample. La2/3Nb and La2/3Sb adopt a rhombohedral structure with the space group R3[combining macron], whereas La2/3Bi adopts a monoclinic structure with the space group I2/m...
January 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28091740/controlling-eutrophication-in-a-mediterranean-shallow-reservoir-by-phosphorus-loading-reduction-the-need-for-an-integrated-management-approach
#14
Mikel Zaragüeta, Pablo Acebes
Increased nutrient enrichment in Mediterranean standing waters has enhanced the risk of being affected by cyanobacterial blooms. Because phosphorus abatement is shaped as a crucial strategy for controlling eutrophication, this study introduces a structural thinking, experiential learning laboratory with animation dynamic model elaborated for Cazalegas Reservoir (Spain) to assess the feasibility of implementing a set of internal and external control measures and hydromorphological adjustments to meet the goal of oligotrophication...
January 13, 2017: Environmental Management
https://www.readbyqxmd.com/read/28081257/influence-of-la3-substitution-on-structure-morphology-and-magnetic-properties-of-nanocrystalline-ni-zn-ferrite
#15
Y K Dasan, B H Guan, M H Zahari, L K Chuan
Lanthanum substituted Ni-Zn ferrite nanoparticles (Ni0.5Zn0.5LaxFe1-xO4; 0.00 ≤x≤ 1.00) synthesized by sol-gel method were presented. X-ray diffraction patterns reveal the typical single phase spinel cubic ferrite structure, with the traces of secondary phase for lanthanum substituted nanocrystals. In addition, the structural analysis also demonstrates that the average crystallite size varied in the range of 21-25 nm. FTIR spectra present the two prominent absorption bands in the range of 400 to 600 cm-1 which are the fingerprint region of all ferrites...
2017: PloS One
https://www.readbyqxmd.com/read/28069199/synergistic-effects-of-ultrasonication-and-ethanol-washing-in-controlling-the-stoichiometry-phase-purity-and-morphology-of-rare-earth-doped-ceria-nanoparticles
#16
Kushal Singh, Rishu Kumar, Anirban Chowdhury
Over a period of last thirty years, use of ethanol has been historically reported for obtaining nanopowders with low agglomeration for various oxide systems. In addition to these benefits, we show for the first time that treatments in ethanol medium coupled with an ultrasonication step can impart crucial additional advantages in controlling the phase purity and stoichiometry/composition for such systems. This is an important issue especially for any complex multicationic oxide nanoparticles system and hence we selected one of the most popular catalyst systems of doped-ceria (CeO2) nanoparticles with very high (50%) level of rare-earth (lanthanum) doping for this case study...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28068585/effects-of-phosphate-binders-on-the-gastrointestinal-absorption-of-arsenate-and-of-an-sglt2-inhibitor-drug-on-the-urinary-excretion-of-arsenite-in-mice
#17
Miklós Poór, Balázs Németi, Zoltán Gregus
Arsenate (As(V)) and arsenite (As(III)) are typical sources of acute and chronic arsenic poisoning. Therefore, reducing inner exposure to these arsenicals is a rational objective. Because As(V) mimics phosphate, phosphate binder drugs may decrease the intestinal As(V) absorption. Indeed, lanthanum and aluminium salts and sevelamer removed As(V) from solution in vitro, especially at acidic pH. In mice gavaged with As(V), lanthanum chloride, lanthanum carbonate and aluminium hydroxide given orally also lowered the urinary excretion and tissue levels of As(V) and its metabolites, indicating that they decreased the gastrointestinal As(V) absorption...
January 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28068567/anthropogenic-rare-earth-elements-and-their-spatial-distributions-in-the-han-river-south-korea
#18
Hyeongseok Song, Woo-Jin Shin, Jong-Sik Ryu, Hyung Seon Shin, Heesun Chung, Kwang-Sik Lee
Rare earth elements (REE) consist of lanthanides (from La to Lu), together with yttrium and scandium, in which anthropogenic REE, such as gadolinium (Gd), lanthanum (La), and samarium (Sm), has emerged as micro-contaminants in natural waters in highly developed countries. Here, we collected water samples in the Han River (HR) and its tributaries flowing through Seoul Capital Area, the world's second largest metropolitan area in order to examine how and to what extent anthropogenic REE anomalies may occur. Water samples show higher light REE concentrations than heavy REE concentrations, while wastewater treatment plant (WWTP) samples display much higher heavy REE concentrations due to high Gd concentration...
April 2017: Chemosphere
https://www.readbyqxmd.com/read/28056417/analysis-of-the-combined-effects-of-lanthanum-and-acid-rain-and-their-mechanisms-on-nitrate-reductase-transcription-in-plants
#19
Binxin Xia, Zhaoguo Sun, Lihong Wang, Qing Zhou, Xiaohua Huang
Rare earth element (REE) pollution and acid rain are major global environmental concerns, and their spatial distributions overlap. Thus, both forms of pollution combine to act on plants. Nitrogen is important for plant growth, and nitrate reductase (NR) is a key plant enzyme that catalyzes nitrogen assimilation. Studying the combined effects of REEs and acid rain on plant nitrogen-based nutrients has important environmental significance. Here, soybean (Glycine max) plants, commonly used for toxicological studies, were exposed to lanthanum (La), a REE, and acid rain to study the NR activities and NR transcriptional levels in the roots...
April 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28056169/concomitant-leaching-and-electrochemical-extraction-of-rare-earth-elements-from-monazite
#20
Synthia Maes, Wei-Qin Zhuang, Korneel Rabaey, Lisa Alvarez-Cohen, Tom Hennebel
Rare earth elements (REEs) have become increasingly important in modern day technologies. Unfortunately, their recycling is currently limited, and the conventional technologies for their extraction and purification are exceedingly energy and chemical intensive. New sustainable technologies for REE extraction from both primary and secondary resources would be extremely beneficial. This research investigated a two-stage recovery strategy focused on the recovery of neodymium (Nd) and lanthanum (La) from monazite ore that combines microbially based leaching (using citric acid and spent fungal supernatant) with electrochemical extraction...
January 18, 2017: Environmental Science & Technology
keyword
keyword
93328
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"