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https://www.readbyqxmd.com/read/27911481/photoluminescence-and-thermoluminescence-of-k2-mg-so4-2-eu-and-evaluation-of-its-kinetic-parameters
#1
Archana Deshpande, N S Dhoble, S C Gedam, S J Dhoble
The K2 Mg(SO4 )2 :Eu phosphor, synthesized by a solid-state diffusion method, was studied for its photoluminescence (PL) and thermoluminescence (TL) characteristics. The X-ray diffraction (XRD) pattern of the material was matched with the standard JCPDF No. 36-1499. For PL characteristics, K2 Mg(SO4 )2 :Eu(2)(+) showed an emission peak at 474 nm when excited at 340 nm, while it showed Eu(3)(+) emission at 580 nm, and 594 nm splitting at 613 nm and 618 nm for an excitation of 396 nm wavelength due to radiative transitions from (5) D0 to (7) Fj (j = 0, 1, 2, 3)...
December 2, 2016: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/27908539/design-synthesis-molecular-docking-anti-proteus-mirabilis-and-urease-inhibition-of-new-fluoroquinolone-carboxylic-acid-derivatives
#2
Mohammed A A Abdullah, Gamal El-Din A A Abuo-Rahma, El-Shimaa M N Abdelhafez, Heba A Hassan, Rehab M Abd El-Baky
New hydroxamic acid, hydrazide and amide derivatives of ciprofloxacin in addition to their analogues of levofloxacin were prepared and identified by different spectroscopic techniques. Some of the prepared compounds revealed good activity against the urease splitting bacteria, Proteus mirabilis. The urease inhibitory activity was investigated using indophenol method. Most of the tested compounds showed better activity than the reference acetohydroxamic acid (AHA). The ciprofloxacin hydrazide derivative 3a and levofloxacin hydroxamic acid 7 experienced the highest activity (IC50=1...
November 9, 2016: Bioorganic Chemistry
https://www.readbyqxmd.com/read/27906474/tuning-the-energy-transfer-efficiency-between-ce-3-and-ln-3-ions-ln-tm-sm-tb-dy-by-controlling-the-crystal-phase-of-nayf4-nanocrystals
#3
Venkata N K B Adusumalli, Heramba V S R M Koppisetti, Sagar Ganguli, Shyam Sarkar, Venkataramanan Mahalingam
NaYF4 is a superior host matrix to study the luminescence properties of lanthanide (Ln(3+) ) ions. Ln(3+) ions in hexagonal-phase NaYF4 (β-phase) nanocrystals (NCs) exhibit strong luminescence via an upconversion process compared to cubic NaYF4 (α-phase) NCs. However, in Ce(3+) /Ln(3+) -doped NaYF4 NCs (Ln=Tm, Tb, Sm, Dy) the α-phase NaYF4 NCs shows strong luminescence compared to their counterpart β-phase NCs despite the latter being much larger in size. This is attributed to comparatively large overlap between Ce(3+) ions emission band with excited energy levels of those Ln(3+) ions in α-phase compared to β-phase NCs...
December 1, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27904075/in-vitro-permeation-and-skin-retention-of-%C3%AE-mangostin-proniosome
#4
Gan Siaw Chin, Hiroaki Todo, Wesam Radhi Kadhum, Mariani Abdul Hamid, Kenji Sugibayashi
The current investigation evaluated the potential of proniosome as a carrier to enhance skin permeation and skin retention of a highly lipophilic compound, α-mangostin. α-Mangostin proniosomes were prepared using the coacervation phase seperation method. Upon hydration, α-mangostin loaded niosomes were characterized for size, polydispersity index (PDI), entrapment efficiency (EE) and ζ-potential. The in vitro permeation experiments with dermis-split Yucatan Micropig (YMP) skin revealed that proniosomes composed of Spans, soya lecithin and cholesterol were able to enhance the skin permeation of α-mangostin with a factor range from 1...
2016: Chemical & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/27899063/a-simple-sample-preparation-for-simultaneous-determination-of-chloramphenicol-and-its-succinate-esters-in-food-products-using-high-performance-liquid-chromatography-high-resolution-mass-spectrometry
#5
Vasiliy Amelin, Anton Korotkov
A simple method is described for determination of chloramphenicol and its succinate esters in food products. Examination of food products using HPLC/high-resolution mass spectrometry showed the presence of not only chloramphenicol but also its succinate forms. A scheme is proposed for determining chloramphenicol and its succinate esters (calculated as chloramphenicol) in meat (beef, pork, poultry), milk, liver, kidney, eggs, fish and honey. Analytes are extracted from a 1.0 g sample with 5 ml acetonitrile. It was found that using the method of standard addition and diluting the extract with water leads to the elimination of matrix effects and also eliminates errors associated with peak splitting due to the separate elution of the differing forms of the analyte...
November 30, 2016: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/27890677/time-course-of-organ-of-corti-degeneration-after-noise-exposure
#6
Barbara A Bohne, Melissa Kimlinger, Gary W Harding
From our permanent collection of plastic-embedded flat preparations of chinchilla cochleae, 22 controls and 199 ears from noise-exposed animals were used to determine when, postexposure, hair cell (HC) and supporting cell (SC) degeneration were completed. The exposed ears were divided into four groups based on exposure parameters: 0.5- or 4-kHz octave band of noise at moderate (M) or high (H) intensities. Postexposure survival ranged from < 1 h to 2.5 y. Ears fixed ≤ 0-12 h postexposure were called ‛acute‛...
November 24, 2016: Hearing Research
https://www.readbyqxmd.com/read/27889546/comparison-of-a-split-dose-bowel-preparation-with-2l-polyethylene-glycol-plus-ascorbic-acid-and-1l-polyethylene-glycol-plus-ascorbic-acid-and-bisacodyl-before-colonoscopy
#7
Seung Hun Kang, Yoon Tae Jeen, Jae Hyung Lee, In Kyung Yoo, Jae Min Lee, Seung Han Kim, Hyuk Soon Choi, Eun Sun Kim, Bora Keum, Hong Sik Lee, Hoon Jai Chun, Chang Duck Kim
BACKGROUND AND AIMS: Recently a low-volume polyethylene glycol containing ascorbic acid (PEG-Asc) formulation has proven as safe and effective as traditional 4L PEG solutions for colonoscopy preparation. However, currently available aqueous purgative formulations are poorly tolerated. The aim of this study was to compare a split-dose 2L PEG-Asc and a 1L PEG-Asc with bisacodyl (10 mg) formulation to determine the quality of bowel cleansing and patient tolerability. METHODS: A single-center, randomized, observer-blinded study was performed between May 2015 and September 2015...
November 23, 2016: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/27878173/silver-doped-molybdenum-carbide-catalyst-with-high-activity-for-electrochemical-water-splitting
#8
Xiumin Li, Xuli Ma, Xiao Du, Junlan Zheng, Xiaogang Hao, Abuliti Abudula, Guoqing Guan
A hybrid catalyst composed of silver (Ag) doped wire-like molybdenum carbide (MoxCy) with pure β-phase and carbon nanotubes (CNTs) was coated well on a carbon rod electrode for the hydrogen evolution reaction (HER). The effects of Ag loading amount and carbonization temperature on the crystal form of MoxCy were investigated in detail. It is found that the MoxCy crystal form can be tuned by adjusting the preparation conditions, and nanostructured wire-like Mo2C with pure β-phase was obtained at a temperature over 750 °C...
November 23, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27878167/gradient-doping-a-case-study-with-ti-fe2o3-towards-an-improved-photoelectrochemical-response
#9
Anupam Srivastav, Anuradha Verma, Anamika Banerjee, Saif A Khan, Mukul Gupta, Vibha Rani Satsangi, Rohit Shrivastav, Sahab Dass
The present study investigates the effect of gradient doping on modifying the photoelectrochemical response of Ti-doped Fe2O3 photoanodes for their use in sunlight based water splitting for hydrogen evolution. The deposition of a thin film over the ITO (tin doped indium oxide) substrate was carried out using a spray pyrolysis method. The concentration of dopant was varied from 0.5-8.0 at% and two sets of samples were also prepared with low to high (0.5-8%) and high to low (8-0.5%) dopant concentrations in the direction towards the substrate...
November 23, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27872492/in-situ-synthesis-enhanced-luminescence-and-application-in-dye-sensitized-solar-cells-of-y2o3-y2o2s-eu-3-nanocomposites-by-reduction-of-y2o3-eu-3
#10
Guohai Yuan, Mingxia Li, Mingqi Yu, Chungui Tian, Guofeng Wang, Honggang Fu
Y2O3/Y2O2S:Eu(3+) nanocomposites were successfully prepared by reducing Y2O3:Eu(3+) nanocrystals. The obtained Y2O3/Y2O2S:Eu(3+) nanocomposites not only can emit enhanced red luminescence excited at 338 nm, but also can be used to improve the efficiency of the dye sensitized solar cells, resulting an efficiency of 8.38%, which is a noticeable enhancement of 12% compared to the cell without Y2O3/Y2O2S:Eu(3+) nanocomposites. The results of the incident photon to current, dynamic light scattering, and diffuse reflectance spectra indicated that the enhancement of the cell efficiency was mainly related to the light scattering effect of Y2O3/Y2O2S:Eu(3+) nanocomposites...
November 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27864978/reduction-of-biological-response-modifiers-in-the-supernatant-of-washed-paediatric-red-blood-cells
#11
Y S Loh, S Tan, M Kwok, M J Stark, D C Marks
BACKGROUND: Washing of red blood cells (RBC) can reduce unwanted biological response modifiers (BRMs) that can mediate transfusion complications in infants. The aim of this study was to examine the in vitro quality and the changes in BRMs following washing in paediatric RBC units. MATERIALS AND METHODS: A pool and split design was used to prepare RBC (either 1 or 4 days old; n = 26 pairs). One unit was washed with 0·9% saline by centrifugation and then resuspended in SAG-M, while the other remained unwashed...
November 2016: Vox Sanguinis
https://www.readbyqxmd.com/read/27864718/phosphate-tablets-or-polyethylene-glycol-for-preparation-to-colonoscopy-a-multicentre-non-inferiority-randomized-controlled-trial
#12
Stanislas Chaussade, Christoph Schmöcker, Pierre Toulemonde, Miguel Muñoz-Navas, Valérie O'Mahony, Franck Henri
BACKGROUND: Adequate bowel preparation is a crucial step in colonoscopy procedure and has been identified as the cornerstone of a quality colonoscopy. Polyethylene glycol (PEG) for bowel cleansing still had up to 10 % unprepared colon. AIM: We herein compare efficacy, acceptability, tolerance and safety of sodium phosphate (NaP) tablets and split-dose PEG for bowel cleansing. PATIENTS AND METHODS: A prospective non-inferiority randomized trial was performed and registered on www...
November 18, 2016: Surgical Endoscopy
https://www.readbyqxmd.com/read/27862702/efficacy-of-xp-endo-finisher-and-trushape-3d-conforming-file-compared-to-conventional-and-ultrasonic-irrigation-in-removing-calcium-hydroxide
#13
Ahmet Demirhan Uygun, Eyüp Candaş Gündoğdu, Hakan Arslan, İbrahim Ersoy
The aim of this study was to compare the efficacy of the XP-endo Finisher and TRUShape 3D Conforming File to conventional and ultrasonic irrigation techniques for removing calcium hydroxide from artificially created grooves on root canals. The study used 32 human mandibular premolar teeth, which were decoronated and instrumented up to ProTaper Universal F5 (Dentsply Maillefer; Ballagiues, Switzerland). The teeth were split longitudinally, two standardised grooves were prepared in the apical and coronal portions and filled with calcium hydroxide...
November 12, 2016: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
https://www.readbyqxmd.com/read/27860269/fullerene-like-nickel-oxysulfide-hollow-nanospheres-as-bifunctional-electrocatalysts-for-water-splitting
#14
Junli Liu, Yong Yang, Bing Ni, Haoyi Li, Xun Wang
Fullerene-like nickel oxysulfide hollow nanospheres with ≈50 nm are constructed by in situ growth on the surface of nickel foam by taking advantage of solvothermal reaction. The as-prepared composite exhibits exhilaratingly high HER and OER performance in 1 m KOH, which opens up a very promising aspect for non-noble metal chalcogenides as bifunctional electrocatalysts.
November 18, 2016: Small
https://www.readbyqxmd.com/read/27842848/structural-features-of-heparanase-inhibiting-non-anticoagulant-heparin-derivative-roneparstat
#15
Anna Alekseeva, Giulia Mazzini, Giuseppe Giannini, Annamaria Naggi
Owing to their anti-tumor and anti-inflammatory properties, non-anticoagulant glycol-split (gs) heparins, obtained by periodate oxidation/borohydride reduction, are of growing interest. The present study was focused on the structural characterization of N-acetylated gs-heparin Roneparstat, a promising anti-cancer heparanase-inhibiting drug currently being investigated in clinical trials. The major and minor structural features of structurally complex Roneparstat have been characterized for the first time using conductimetric titration, size-exclusion chromatography with triple detector array, NMR and LC/MS...
January 20, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27834981/design-and-application-of-au-decorated-zno-tio2-as-a-stable-photocatalyst-for-wide-spectral-coverage
#16
Soumita Mukhopadhyay, Debabrata Maiti, Sabyasachi Chatterjee, Parukuttyamma Sujatha Devi, Gopinatha Suresh Kumar
A ternary nanostructured photocatalyst consisting of ZnO/TiO2/Au was designed to achieve an enhanced solar absorption due to the coupling of surface enhanced plasmonic absorption of metal and semiconductor excitons. TiO2 coated ZnO rods with an aspect ratio of 8-12 were decorated with citrate capped gold nanoparticles for photocatalytic degradation of organic pollutants in simulated waste water under solar irradiation. Simulated waste water was prepared so as to get a mixture exhibiting a wide range of spectral distribution in the UV-visible region by deliberately mixing congo red, methylene blue and malachite green...
November 11, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27831573/electron-acceptor-of-ni-decorated-porous-carbon-nitride-applied-in-photocatalytic-hydrogen-production
#17
Lingling Bi, Dedong Meng, Qijing Bu, Yanhong Lin, Dejun Wang, Tengfeng Xie
Nickel, a non-noble metal, is one of the most promising candidates for photocatalysis because it is inexpensive and an earth-abundant metal. Herein, Ni/CM-C3N4 nanocomposites with Ni as a cocatalyst were synthesized by a simple solvothermal method. Field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) confirmed that Ni nanoparticles were loaded onto the surface of CM-C3N4. The prepared Ni/CM-C3N4 nanocomposites exhibited an enhanced hydrogen evolution activity...
November 10, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27827494/solvent-induced-structural-diversity-in-tetranuclear-ni-ii-schiff-base-complexes-the-first-ni4-single-molecule-magnet-with-a-defective-dicubane-like-topology
#18
Radovan Herchel, Ivan Nemec, Marek Machata, Zdeněk Trávníček
Two tetranuclear Ni(II) complexes, namely [Ni4(L)4(CH3OH)3(H2O)]·CH3OH (1) and (Pr3NH)2[Ni4(L)4(CH3COO)2] (2, Pr3N = tripropylamine), were synthesized from a tridentate Schiff base ligand H2L (2-[(E)-(2-hydroxybenzylidene)amino]phenol) and Ni(CH3COO)2·4H2O, using different solvents and their ratios (CH3OH and/or CH2Cl2). The prepared Ni4 complexes are of different structural types, involving an Ni4O4 cubane-like core (1) and Ni4O6 defective dicubane-like core (2), with all the Ni atoms hexacoordinated. The complexes were characterized by elemental analysis, FT-IR spectroscopy, variable temperature and field magnetic measurements, and single crystal X-ray analysis...
November 9, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27819107/high-efficiency-p-n-junction-oxide-photoelectrodes-for-photoelectrochemical-water-splitting
#19
Zhifeng Liu, Lu Yan
Development of all oxide p-n junctions makes a significant advancement in photoelectrode catalysis functional materials. In this article, we report the preparation of TiO2 nanorod (NR)/Cu2O photoanodes via a simple hydrothermal method followed by an electrochemical deposition process. This facile synthesis route can simultaneously achieve uniform TiO2 NR/Cu2O composite nanostructures and obtain varied amounts of Cu2O by controlling the deposition time. The photocurrent density of TiO2 NR/Cu2O heterojunction photoanodes enhanced the photocatalytic activity with a photocurrent density of 5...
November 16, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27810854/the-development-and-validation-of-an-index-to-predict-10-year-mortality-risk-in-a-longitudinal-cohort-of-older-english-adults
#20
Lindsay C Kobayashi, Sarah E Jackson, Sei J Lee, Jane Wardle, Andrew Steptoe
BACKGROUND: we aimed to develop and validate a population-representative 10-year mortality risk index for older adults in England. METHODS: data were from 10,798 men and women aged 50 years and older in the population-based English Longitudinal Study of Ageing in 2002/03, randomly split into development (n = 5,377) and validation cohorts (n = 5,421). Participants were asked about their sociodemographics, health behaviours, comorbidities, and functional status in the home-based interviews...
November 3, 2016: Age and Ageing
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