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Lin Zhang, Lingyan Zhou, Qing X Li, Hong Liang, Huaming Qin, Stephen Masutani, Brandon Yoza
Moniliella wahieum Y12 T , isolated from biodiesel was used as a model organism to assess the use of lanthanum oxide (La 2 O 3 ) (60-80 nm) and silver oxide (AgO) (10-40 nm) nanoparticles as potential fungal inhibitors. This is the first study to investigate the use of nanoscale La 2 O 3 as a eukaryotic bio-inhibitor. The AgO nanoparticles were relatively effective at inhibiting the growth of M. wahieum Y12 T . The half maximal effective concentration (EC 50 ) for AgO was 0.012 mg/mL as compared with 4.63 mg/mL of La 2 O 3 ...
February 8, 2018: Chemosphere
Uwe Schroeder, Claudia Richter, Min Hyuk Park, Tony Schenk, Milan Pešić, Michael Hoffmann, Franz P G Fengler, Darius Pohl, Bernd Rellinghaus, Chuanzhen Zhou, Ching-Chang Chung, Jacob L Jones, Thomas Mikolajick
Recently simulation groups have reported the lanthanide series elements as the dopants that have the strongest effect on the stabilization of the ferroelectric non-centrosymmetric orthorhombic phase in hafnium oxide. This finding confirms experimental results for lanthanum and gadolinium showing the highest remanent polarization values of all hafnia-based ferroelectric films until now. However, no comprehensive overview that links structural properties to the electrical performance of the films in detail is available for lanthanide-doped hafnia...
February 15, 2018: Inorganic Chemistry
Yan Li, Shanshan Xu, Zhiwei Wang, Lingchao He, Kang Xu, Genxuan Wang
Sugars play important roles in regulating plant growth, development and stomatal movement. Here, we found that glucose triggered stomatal closure, showing a dose-and time-dependent manner in Arabidopsis. Pharmacological data showed that glucose-induced stomatal closure was greatly inhibited by catalase (CAT, a reactive oxygen species (ROS) scavenger), diphenyleneiodonium chloride (DPI, an NADPH oxidase inhibitor), lanthanum chloride (LaCl3, a Ca2+ channel blocker), ethylene glycol tetraacetic acid (EGTA, a Ca2+ chelator), two nitrate reductase (NR) inhibitors, tungstate and sodium azide (NaN3), while not affected by salicylhydroxamic acid (SHAM, a peroxidase inhibitor)...
February 10, 2018: Journal of Experimental Botany
Bingxia Zhao, Yihan Chen, Jinfeng Liu, Li Zhang, Jing Wang, Yali Yang, Qing Lv, Mingxing Xie
Objective: To investigate the effects of the microbubble (MB) dose, mechanism index (MI) and sonication duration on blood-brain barrier (BBB) disruption induced by diagnostic ultrasound combined with MBs as well as to investigate the potential molecular mechanism. Results: The extent of BBB disruption increased with MB dose, MI and sonication duration. A relatively larger extent of BBB disruption associated with minimal tissue damage was achieved by an appropriate MB dose and ultrasound exposure parameters with diagnostic ultrasound...
January 12, 2018: Oncotarget
Ruru Ma, Yun Yang, Cong Hu, Xiaoyu Dong, Zhihua Yang, Shilie Pan
Two new mixed alkali metal lanthanum borates, LiCs2La(BO3)2 and Li3K9La3(BO3)7, were synthesized through a high-temperature solution method and millimeter-sized colorless crystals were obtained. The structures of LiCs2La(BO3)2 and Li3K9La3(BO3)7 have an intricate three-dimensional (3D) open framework with one-dimensional (1D) infinite channels surrounded by cation polyhedra and isolated BO3 units. In particular, LiCs2La(BO3)2 exhibits a short cut-off edge <190 nm and a large experimental band gap of 6.20 eV, evidenced by diffuse reflection spectroscopy...
February 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Shiming Ding, Qin Sun, Xiang Chen, Qing Liu, Dan Wang, Juan Lin, Chaosheng Zhang, Daniel C W Tsang
Iron redox cycle plays a primary role in controlling the mobility of P in sediments. It is crucial to better understand how lanthanum (La) modified bentonite (LMB, Phoslock®), an increasingly employed capping agent, immobilizes P from sediments by altering Fe redox-coupled P cycling. Batch adsorption experiments found that LMB effectively adsorbed Fe(II) with a capacity of 8.51 mg g-1. Fe(II)-preloaded LMB effectively retained P during a 518-hour equilibration, while up to 16.7% of adsorbed P was release-sensitive in LMB without Fe(II) preloading...
February 1, 2018: Water Research
Yong Si, Lihong Wang, Qing Zhou, Xiaohua Huang
Plant phytoliths are important for silicon (Si) cycling in natural ecosystems; however, their role in lanthanum (La) sequestration in plants is still unclear. In the present study, we elucidated the mechanism of La-induced damage to the growth of rice (Oryza sativa L.) seedling from the viewpoint of the La sequestration by phytoliths (PhytLa). The phytoliths were extracted by using the microwave digestion method. La concentrations within the plants and phytoliths were determined by a modified lithium metaborate fusion method...
February 2, 2018: Environmental Science and Pollution Research International
Wenjin Cao, Dilrukshi Hewage, Dong-Sheng Yang
La atom reactions with 1-butene, 2-butene, and isobutene are carried out in a laser-vaporization molecular beam source. The three reactions yield the same La-hydrocarbon products from the dehydrogenation and carbon-carbon bond cleavage and coupling of the butenes. The dehydrogenated species La(C4H6) is the major product, which is characterized with mass-analyzed threshold ionization (MATI) spectroscopy and quantum chemical computations. The MATI spectrum of La(C4H6) produced from the La+1-butene reaction exhibits two band systems, whereas the MATI spectra produced from the La+2-butene and isobutene reactions display only a single band system...
January 28, 2018: Journal of Chemical Physics
K Y Lee, K I Lee, J H Kim, T Lho
The high resolution Thomson scattering system with 63 points along a 25 mm line measures the radial electron temperature (Te) and its density (ne) in an argon plasma. By using a DC arc source with lanthanum hexaboride (LaB6) electrode, plasmas with electron temperature of over 5 eV and densities of 1.5 × 1019 m-3 have been measured. The system uses a frequency doubled (532 nm) Nd:YAG laser with 0.25 J/pulse at 20 Hz. The scattered light is collected and sent to a triple-grating spectrometer via optical-fibers, where images are recorded by an intensified charge coupled device (ICCD) camera...
January 2018: Review of Scientific Instruments
Tracy M Mattox, D Keith Coffman, Inwhan Roh, Christopher Sims, Jeffrey J Urban
Lanthanum hexaboride (LaB₆) has become a material of intense interest in recent years due to its low work function, thermal stability and intriguing optical properties. LaB₆ is also a semiconductor plasmonic material with the ability to support strong plasmon modes. Some of these modes uniquely stretch into the infrared, allowing the material to absorb around 1000 nm, which is of great interest to the window industry. It is well known that the plasmon of LaB₆ can be tuned by controlling particle size and shape...
February 1, 2018: Materials
H Thagira Banu, P Karthikeyan, Sankaran Meenakshi
In the present work, lanthanum encapsulated chitosan-montmorillonite composite (La-CS-MMT) was prepared as an adsorbent for the effective removal of phosphate ions from aqueous solution. Characterization of the adsorbent using FT-IR, XRD, SEM with EDX, TGA and DTA techniques were carried out. Batch adsorption experiments were carried out to optimize the effects of various operating parameters viz., shaking time, initial concentration of phosphate ions, dosage, competitor co-existing ions, pH and temperature...
January 26, 2018: International Journal of Biological Macromolecules
Chaowat Autthanit, Bunjerd Jongsomjit
The present work deals with the catalytic performance of SBA-15 supported catalysts in the gas phase catalytic dehydration of ethanol in the temperature range of 200 to 400°C. The SBA-15 support was incorporated on a zirconium (Zr) and bimetal of zirconium and lanthanum (Zr-La) prepared by sol-gel (SG) and hydrothermal (HT) methods. The catalysts were characterized by means of N2 physisorption, SEM/EDX, and NH3-TPD. The experimental results demonstrated that the Zr-La/SBA-15-HT exhibited the highest catalytic activity...
January 23, 2018: Journal of Oleo Science
S S D Elanchezhiyan, Subbaiah Muthu Prabhu, Sankaran Meenakshi
Herein, synthesized and compared the three different kinds of hybrid bio-polymeric composites viz., lanthanum embedded chitosan/gelatin (La@CS-GEL), zirconium embedded chitosan/gelatin (Zr@CS-GEL) and cerium embedded chitosan/gelatin (Ce@CS-GEL) in terms of their oil uptake efficiency. The adsorption efficiency was studied under various optimized parameters like contact time, pH, dose and temperature. The oil adsorption capacity was found to be 91, 82 and 45% for La@CS-GEL, Zr@CS-GEL and Ce@CS-GEL composites respectively...
January 20, 2018: International Journal of Biological Macromolecules
Dirk Hsm Schellekens, Inca Hr Hundscheid, Claire Aji Leenarts, Joep Grootjans, Kaatje Lenaerts, Wim A Buurman, Cornelis Hc Dejong, Joep Pm Derikx
AIM: To assess intestinal barrier function during human intestinal ischemia and reperfusion (IR). METHODS: In a human experimental model, 6 cm of jejunum was selectively exposed to 30 min of ischemia (I) followed by 30 and 120 min of reperfusion (R). A sham procedure was also performed. Blood and tissue was sampled at all-time points. Functional barrier function was assessed using dual-sugar absorption tests with lactulose (L) and rhamnose (R). Plasma concentrations of citrulline, an amino acid described as marker for enterocyte function were measured as marker of metabolic enterocytes restoration...
December 28, 2017: World Journal of Gastroenterology: WJG
Alessandra Marra, Alessandra Cesaro, Eldon R Rene, Vincenzo Belgiorno, Piet N L Lens
A bioleaching process developed in two separate steps was investigated for the recovery of base metals, precious metals and rare earth elements from dusts generated by Waste Electrical and Electronic Equipment (WEEE) shredding. In the first step, base metals were almost completely leached from the dust in 8 days by Acidithiobacillus thiooxidans (DSM 9463) that lowered the pH of the leaching solution from 3.5 to 1.0. During this step, cerium, europium and neodymium were mobilized at high percentages (>99%), whereas lanthanum and yttrium reached an extraction yield of 80%...
January 15, 2018: Journal of Environmental Management
Xiaoyu Hu, Jinghua Yang, Yaling Sun, Xiang Gao, Lijin Zhang, Yingqi Li, Miao Yu, Shiyu Liu, Xiaobo Lu, Cuihong Jin, Shengwen Wu, Yuan Cai
Studies have reported that lanthanum chloride (LaCl3) can across the blood-brain barrier, accumulate in the brain and affect the spatial learning and memory abilities. However, the potential mechanism that LaCl3-induced neurotoxic effects has not yet been defined. Glutamate (Glu) is a vital excitatory neurotransmitter, and the excessive Glu accumulation in extracellular space can induce excitatory neurotoxicity. This study was designed to research the influence of LaCl3 on the spatial learning and memory abilities of rats and to discuss the possible mechanism underlying this effect regarding the extracellular Glu concentration, the Glu-glutamine (Gln) cycle and the N-methyl-D-aspartate (NMDA) receptors...
January 15, 2018: Food and Chemical Toxicology
Gui-Hua Zhao, Yao-Yao Fang, Wei Dai, Na Ma
A novel high-performance porous carbon material, lanthanum(III)-doped finger-citron-leaf-based porous carbon (La/FPC), has been synthesized and used as an adsorbent for anion dye Congo red (CR). The La/FPC was characterized by nitrogen adsorption and desorption isotherms, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The adsorption performance of CR by the FPC and La/FPC composites with different contents of lanthanum(III) were evaluated in fixed-bed breakthrough experiments and batch tests at room temperature (298 K)...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Can Deng, Xinpeng Li, Xinkai Xue, Richard M Pashley
Considering the ever-growing usage of trivalent salts in water treatment, for example, lanthanum salts in rare earth, AlCl3 and FeCl3 , the effects of different trivalent cations on the bacterium Escherichia coli (E. coli) ATCC 11775 strain have been studied in aqueous solutions. From colony incubation studies, the colony-forming unit (CFU) densities were found to decrease significantly in the presence of even low levels (10-5  mol/L) of lanthanum chloride. This level of reduction in CFU number is comparable to the results obtained using the known bacteriocidal cationic surfactant, C14 TAB...
January 15, 2018: MicrobiologyOpen
Cheng Chi, Baohong Sun, Ninglin Zhou, Ming Zhang, Xiaohong Chu, Ping Yuan, Jian Shen
A novel catalyst system of Reverse Atom Transfer Radical Polymerization (RATRP) to prepare Polyurethane (PU) films modified by poly(2-methacryloyloxyethyl phosphorylcholine) (pMPC) was studied in this article. In this system, PU film was pretreated by LaCl3/CA ethanol solution to obtain a hydrated surface allowing more initiators to be immobilized on it. Moreover, complexes composed of silane coupling agent 3-chloropropyltrimethoxysilane (CPTM), chlorhexidine acetate (CA) and lanthanum(III) worked as ligands of copper ions as a whole during RATRP process...
January 8, 2018: Colloids and Surfaces. B, Biointerfaces
Yulia Shlapa, Sergii Solopan, Anatolii Belous, Alexandr Tovstolytkin
Nanoparticles of lanthanum-strontium manganite were synthesized via different methods, namely, sol-gel method, precipitation from non-aqueous solution, and precipitation from reversal microemulsions. It was shown that the use of organic compounds and non-aqueous media allowed significantly decreasing of the crystallization temperature of nanoparticles, and the single-phased crystalline product was formed in one stage. Morphology and properties of nanoparticles depended on the method and conditions of the synthesis...
January 11, 2018: Nanoscale Research Letters
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