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Sample records for susceptible pvp title

  1. Electrospun Borneol-PVP Nanocomposites

    Directory of Open Access Journals (Sweden)

    Xiao-Yan Li

    2012-01-01

    Full Text Available The present work investigates the validity of electrospun borneol-polyvinylpyrrolidone (PVP nanocomposites in enhancing drug dissolution rates and improving drug physical stability. Based on hydrogen bonding interactions and via an electrospinning process, borneol and PVP can form stable nanofiber-based composites. FESEM observations demonstrate that composite nanofibers with uniform structure could be generated with a high content of borneol up to 33.3% (w/w. Borneol is well distributed in the PVP matrix molecularly to form the amorphous composites, as verified by DSC and XRD results. The composites can both enhance the dissolution profiles of borneol and increase its physical stability against sublimation for long-time storage by immobilization of borneol molecules with PVP. The incorporation of borneol in the PVP matrix weakens the tensile properties of nanofibers, and the mechanism is discussed. Electrospun nanocomposites can be alternative candidates for developing novel nano-drug delivery systems with high performance.

  2. Update on Greenlight laser vaporization (PVP) 2014.

    Science.gov (United States)

    Rieken, Malte; Bachmann, Alexander

    2015-04-01

    To asses the (1) outcomes and (2) intraoperative, perioperative, and long-term complications of photoselective vaporization of the prostate (PVP) with Greenlight laser. A systematic review of outcomes and complications of PVP was conducted. The article selection process was performed according to PRISMA guidelines and included publications published between 2009 and 2014. All generations of PVP (80, 120, 180 W) lead to a significant improvement of micturition symptoms (IPSS, QoL) and voiding parameters (Q max, PVR volume) during follow-up. Data on sexual function are heterogeneous and suggest a trend toward decline in erectile function in men with sustained preoperative erection. The rate of intraoperative complications is low. Data on peri- and postoperative complications show a large variation that mainly can be attributed to heterogeneity in documentation. PVP leads to a statistically significant and clinically relevant improvement of voiding parameters and micturition symptoms in patients with prostates technique is characterized by a high degree of intra- and perioperative safety. Long-term evidence on functional outcomes and complications beyond 3 years from RCTs is currently missing for all generations of the Greenlight laser.

  3. Title and title page.

    Science.gov (United States)

    Peh, W C G; Ng, K H

    2008-08-01

    The title gives the first impression of a scientific article, and should accurately convey to a reader what the whole article is about. A good title is short, informative and attractive. The title page provides information about the authors, their affiliations and the corresponding author's contact details.

  4. Browse Title Index

    African Journals Online (AJOL)

    Items 1 - 11 of 11 ... Issue, Title. Vol 2, No 1-2 (2009), Antimicrobial Susceptibility Patterns Of Salmonella Species In Contemporary Medical Practice: Challenges And Prospects In Treatment Of Enteric Fevers, Abstract. GTA Jombo, MNO Enenebeaku, SJ Utsalo. Vol 2, No 1-2 (2009), Beliefs And Practice Concerning Pregnancy ...

  5. Properties of radiation synthesized PVP-kappa carrageenan hydrogel blends[PVP; Carrageenan; Hydrogels; Radiation crosslinking; Radiation grafting; Semi-interpenetrating network

    Energy Technology Data Exchange (ETDEWEB)

    Abad, L.V. E-mail: lvabad@pnri.dost.gov.ph; Relleve, L.S.; Aranilla, C.T.; Rosa, A.M. dela

    2003-12-01

    Hydrogels have been synthesized from varying concentrations of polyvinyl pyrolidone (PVP) and kappa carrageenan (KC) using gamma radiation. Physical properties such as gel fraction and swelling behavior were determined. Data revealed the presence of a network structure whereby KC is physically entangled into the crosslinked PVP (SIPN). TGA, X-RF and FT-IR analyses of the gel fractions also indicated grafting and crosslinking of the PVP. The degree of grafting and crosslinking depended on the concentrations of KC and PVP. Maximum grafting was obtained at higher KC concentration and lower PVP.

  6. Optical properties of PbS/PVP nanocomposites films

    Energy Technology Data Exchange (ETDEWEB)

    Patel, Mitesh H., E-mail: miteshpatel7204@gmail.com; Chaudhuri, Tapas K. [Dr. K. C. Patel Research and Development Centre, Charotar University of Science and Technology Changa, Anand District, Gujarat 388421 (India); Patel, Vaibhav K. [P. D. Patel Institute of Applied Sciences, Charotar University of Science and Technology, Changa, Anand District, Gujarat 388421 (India); Shripathi, T.; Deshpande, U. [UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore, Madhya Pradesh 452001 (India)

    2016-05-06

    PbS/Polyvinylpyrrolidone (PVP) nanocomposites films with different volume fraction of PbS have been deposited from single molecular precursors. X-ray diffraction patterns conforms the formation of PbS nanocrystals in PVP matrix. The transmission spectra of the films in the wavelength range of 300 to 2400 nm show the absorption edges are blue shifted due to formation of PbS Nanoparticles. The band gap determined are 2.4, 1.5 and 1.25 eV for PbS volume fraction of 8.5, 16, 27%, respectively. The corresponding refractive indices, n determined from Fresnel relation are 1.8, 2, and 2.35 which are in between that of PbS (4.2) and PVP (1.48).

  7. Colloids and composite materials Au/Pvp and Ag/Pvp generated by laser ablation in polymeric liquid environment

    Energy Technology Data Exchange (ETDEWEB)

    Larez, J.; Rojas, C. [Universidad Central de Venezuela, Faculty of Science, Center of Experimental Solid State Physics, Paseo Los Ilustres, Los Chaguaramos, Apdo. Postal 20513, Caracas 1020-A (Venezuela, Bolivarian Republic of); Castell, R., E-mail: jlarez@fisica.ciens.ucv.ve [Universidad Simon Bolivar, Department of Physics, Plasma and Laser Spectroscopy Laboratory, Valle de Sartenejas, Baruta, Apdo. Postal 89000, Caracas 1080-A (Venezuela, Bolivarian Republic of)

    2016-11-01

    Pulsed laser ablation of silver and gold targets, immersed in a polymeric solution of Polyvinylpyrrolidone (Pvp), is used to generate colloids and composite metal-polymer. Solutions of Pvp in deionized water at different concentrations are employed. Two Pvp number average molecular weights were considered, 10000 g/mol and 55000 g/mol. The high purity targets are irradiated between 20 min and 40 min with the third harmonic (Thg) (λ = 335 nm) of a Nd:YAG laser operating at a rate of 10 Hz with pulses of 8 ns. Optical spectroscopy in UV and vis regions, scanning electron microscopy, high resolution scanning electron microscopy and X-ray are used to identify and determine the shape and size of the produced particles. Very stable sub-micrometric spherical particles for Au/Pvp and Ag/Pvp samples are obtained with diameters of 0.72 μm and 0.40 μm, respectively. The preparation of colloids is performed in one step and no surfactant or dispersing agent is used in this process. (Author)

  8. Structural Modification of the Designer Stimulant ?-Pyrrolidinovalerophenone (?-PVP) Influences Potency at Dopamine Transporters

    OpenAIRE

    Kolanos, R.; Sakloth, F; Jain, A. D.; Partilla, J S; Baumann, M H; Glennon, R. A.

    2015-01-01

    ?-Pyrrolidinovalerophenone (?-PVP, 7) is an illegal synthetic stimulant that is being sold on the clandestine market as ?flakka? and ?gravel?. The potent pharmacological effects of ?-PVP are presumably mediated by inhibition of dopamine uptake at the dopamine transporter (DAT). However, little is known about how structural modification of ?-PVP influences activity at DAT. Eleven analogs of ?-PVP were synthesized and examined for their ability to inhibit uptake of [3H]dopamine and [3H]serotoni...

  9. Synthesis and Conductometric Property of Sol-Gel-Derived ZnO/PVP Nano Hybrid Films

    Science.gov (United States)

    Ilegbusi, Olusegun J.; Trakhtenberg, Leonid

    2013-03-01

    ZnO nanoparticles immobilized in polyvinylpyrrolidone (PVP) were prepared using sol-gel dip-coating technique with varying Zn2+/PVP ratios. The films were characterized using atomic force microscopy, x-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy for chemical analysis. The size and concentration of ZnO particles decreased as the Zn/PVP ratio decreased. Under low Zn2+/PVP molar ratios, ZnO particles were clearly well separated and capped in the PVP polymer matrix. Electrical resistivity of 108 Ω cm was achieved under these deposition conditions.

  10. Biomimetic Branched Hollow Fibers Templated by Self-assembled Fibrous Polyvinylpyrrolidone (PVP) Structures in Aqueous Solution

    Science.gov (United States)

    Qiu, Penghe; Mao, Chuanbin

    2010-01-01

    Branched hollow fibers are common in nature, but to form artificial fibers with a similar branched hollow structure is still a challenge. We discovered that polyvinylpyrrolidone (PVP) could self-assemble into branched hollow fibers in an aqueous solution after aging the PVP solution for about two weeks. Based on this finding, we demonstrated two approaches by which the self-assembly of PVP into branched hollow fibers could be exploited to template the formation of branched hollow inorganic fibers. First, inorganic material such as silica with high affinity against the PVP could be deposited on the surface of the branched hollow PVP fibers to form branched hollow silica fibers. To extend the application of PVP self-assembly in templating the formation of hollow branched fibers, we then adopted a second approach where the PVP molecules bound to inorganic nanoparticles (using gold nanoparticles as a model) co-self-assemble with the free PVP molecules in an aqueous solution, resulting in the formation of the branched hollow fibers with the nanoparticles embedded in the PVP matrix constituting the walls of the fibers. Heating the resultant fibers above the glass transition temperature of PVP led to the formation of branched hollow gold fibers. Our work suggests that the self-assembly of the PVP molecules in the solution can serve as a general method for directing the formation of branched hollow inorganic fibers. The branched hollow fibers may find potential applications in microfluidics, artificial blood vessel generation, and tissue engineering. PMID:20158250

  11. Chemoselective hydrogenation of arenes by PVP supported Rh nanoparticles

    DEFF Research Database (Denmark)

    Ibrahim, Mahmoud; Poreddy, Raju; Philippot, Karine

    2016-01-01

    Polyvinylpyrrolidone-stabilized Rh nanoparticles (RhNPs/PVP) of ca. 2.2 nm in size were prepared by the hydrogenation of the organometallic complex [Rh(η3-C3H5)3] in the presence of PVP and evaluated as a catalyst in the hydrogenation of a series of arene substrates as well as levulinic acid...... for the hydrogenation of levulinic acid and methyl levulinate in water leading to quantitative formation of the fuel additive γ-valerolactone under moderate reaction conditions compared to previously reported catalytic systems....... and methyl levulinate. The catalyst showed excellent activity and selectivity towards aromatic ring hydrogenation compared to other reported transition metal-based catalysts under mild reaction conditions (room temperature and 1 bar H2). Furthermore, it was shown to be a highly promising catalyst...

  12. Biocompatibility study for PVP wound dressing obtained in different conditions

    Science.gov (United States)

    Higa, O. Z.; Rogero, S. O.; Machado, L. D. B.; Mathor, M. B.; Lugão, A. B.

    1999-08-01

    Hydrogels composed of PVP, PEG and agar, produced by simultaneous crosslinking and package sterilization by ionizing radiation, are used mainly as wound dressing. In this study, membranes prepared in different conditions were tested for their properties including in vitro biocompatibility. The results showed that the mechanical properties were in an acceptable range of values and that the membranes can be considered as non toxic and non hemolytic to the cells.

  13. Evaluation of beta-lactose, PVP K12 and PVP K90 as excipients to prepare piroxicam granules using two wet granulation techniques.

    Science.gov (United States)

    Albertini, Beatrice; Cavallari, Cristina; Passerini, Nadia; González-Rodríguez, M L; Rodriguez, Lorenzo

    2003-11-01

    The present investigation aimed at evaluating the use of different excipients, beta-lactose and polyvinylpyrrolidone of two molecular weights (PVP K12 and PVP K90), in the production of improved release piroxicam granules, by wet granulation using both water and steam as granulation liquid. The formulations examined were: piroxicam (Px)/beta-lactose; Px/PVP K12 and Px/PVP K90, each one at a 1:9 weight ratio. The most significant difference between beta-lactose and PVP is that, using the first excipient, both steam and water granules were produced while, when PVP were employed, only steam granules were obtained. Image analysis revealed that beta-lactose steam granules had a larger surface area with respect to water granules, whereas lower values of this parameter were observed in PVP-s granules, confirming the Scanning Electron Microscopy micrographs and the fractal analysis results. As regards the enhancement of the dissolution profiles, the best result was obtained using beta-lactose steam granules followed by PVP K12 ones, even if the reactive dimension values indicated that during the dissolution process PVP K12 granules modified the surface more than beta-lactose granules. As regards PVP K90, this excipient was the one less influencing the granule morphology and the dissolution behaviour. Differential Scanning Calorimetry analysis suggested the partial amorphisation of the drug in the granules containing the three excipients. This result was then confirmed by X-ray powder diffraction analysis. Therefore, beta-lactose and PVP K12 could be proposed as useful excipients to enhance the dissolution rate of Px from granules prepared using the steam granulation technique.

  14. Alpha-PVP induces the rewarding effect via activating dopaminergic neuron.

    Science.gov (United States)

    Hataoka, Kyoko; Kaizaki-Mitsumoto, Asuka; Numazawa, Satoshi

    2017-01-01

    A synthetic cathinone, 1-phenyl-2-(1-pyrrolidinyl)-1-pentanone (α-PVP), was occasionally found in the "bath salt" type of designer drugs, as an active ingredient. It has been reported that drivers who consumed α-PVP were in an excited state and incapable of controlling their behavior, causing traffic accidents. Despite its acute excitatory effects, there is no information on the psychological dependency elicited by α-PVP use. The purpose of the present study was to clarify whether the reward pathway is activated with repeated doses of α-PVP in experimental animals. Treatment of male C57BL/6j mice with α-PVP (25 mg/kg, i.p.), once a day, for 3 days significantly increased the conditioned place preference scores. Therefore, repeated doses of α-PVP were shown to induce palatability in mice. α-PVP increases extracellular dopamine levels in the nucleus accumbens shell immediately after administration. The number of cells immunopositive for phosphorylated cAMP-regulatory element binding protein (CREB) was significantly increased in the α-PVP-treated mice in our study. These results indicate that the administration of α-PVP activates the phosphorylation of CREB in the nucleus accumbens shell. Our results suggest that α-PVP stimulates the reward pathway by increasing the extracellular dopamine levels and CREB phosphorylation in the nucleus accumbens shell, eventually causing positive reinforcement in mice.

  15. Slug-tests in PP- and PVP-holes at Olkiluoto in 2012

    Energy Technology Data Exchange (ETDEWEB)

    Tammisto, E. [Poeyry Finland Oy, Vantaa (Finland)

    2014-02-15

    As part of the program for the final disposal of the nuclear fuel waste, Posiva Oy investigates the hydrological conditions at the Olkiluoto Island. The hydraulic conductivity in the shallow investigation holes OL-PP36, -PP39, -PVP4A, -PVP4B, -PVP6A, -PVP6B, -PVP14, -PVP36, -PVP37A, -PVP37B, -PVP37C, -PVP38A, -PVP38B, -PVP38C, -PVP38D, -HP1, -HP2, -HP3 and -HP4 was measured in summer 2012. The length of PP-holes is between 12 m and 14 m, and the test sections (1 m) are located in the bedrock. PVP-tubes have an average length between 4 - 15 m, and the test sections (2 m) are located in the overburden. The length of HP-tubes is 3 m or 5 m and the test sections (1 m) are located in the overburden. The measurements were carried out using the slug-test technique with 2010 renewed equipment. In the slug-test, the hydraulic head in the borehole is abruptly changed either by pouring water into the hole or by lowering the pressure sensor. The hydraulic conductivity is interpreted from the recovery of the water level. This report presents the field measurements and their interpretation. The interpretation has been done using the Hvorslev's method, and for reference, conductivity has also been calculated according to the Thiem's equation. According to the results, hydraulic conductivity in the PP-holes ranges from 10{sup -8} m/s to 10{sup -6} m/s and in the PVP- and the HP-tubes from 10{sup -8} m/s to 10{sup -5} m/s. The observed range is quite similar as in the previous measurements in 2002 and 2004-2011. In general, the results are consistent with the results obtained in the earlier measurements. In OL-PP36, the results from 2012 agree very well with the earlier results except section 8.17 - 9.17 m, in which K-values from 2007, 2008 and 2009 differ from the other years. In OL-PP39, the results agree well. There is more difference in low K-values than in higher ones. In the PVP-tubes, the variations are small. In the HP-tubes, the K-values clearly differ from the

  16. Synthesis and electromagnetic properties of PANI/PVP/CIP core–shell composites

    Energy Technology Data Exchange (ETDEWEB)

    Tang, Jihai [College of Materials Science and Engineering, Chongqing University, Chongqing 400044 (China); No. 59 Research Institute of China Ordnance Industry, Chongqing 400039 (China); Ma, Li, E-mail: mlsys607@126.com [College of Materials Science and Engineering, Chongqing University, Chongqing 400044 (China); Tian, Nan; Gan, Mengyu; Xu, Fenfang; Zeng, Jun; Tu, Ying [College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030 (China)

    2014-08-01

    Highlights: • PANI/PVP/CIP core–shell composite was prepared, where PVP can hinder aggregation of CIP and PANI/PVP/CIP composites. • Core–shell structure increases absorbent interface, benefiting reflection, scattering and electromagnetic wave absorption. • PANI/PVP/CIP core–shell composites show better electromagnetic matching and microwave absorption in a wider frequency range. - Abstract: The polyaniline/polyvinylpyrrolidone/carbonyl iron powder (PANI/PVP/CIP) core–shell composites were prepared by in-situ polymerization in the PVP aqueous solution using toluenesulfonic acid (TSA) as dopant and ammonium persulfate (APS) as oxidant. The PANI/PVP/CIP was systematically investigated using scanning electron microscopy (SEM), FT-IR spectroscopy, electrochemical workstation, thermogravimetry analysis (TGA) and vector network analyzer. The results showed that the PANI/PVP can dramatically improve corrosion resistance of CIP. Compared with pure CIP, the PANI/PVP/CIP composites exhibited better impedance match and excellent microwave absorption properties. The reflection loss was found to <–10 dB in the 27.3–39.5 GHz range at thickness of 1.1 mm, and the minimum reflection loss of −15.28 dB was observed at 29.47 GHz with a matching thickness of 1.2 mm. A possible mechanism of the improved microwave absorption properties of the core–shell structure was obtained.

  17. An Analysis of Open World PvP in LOTRO's PvMP as a Case Study for PvP Games

    Directory of Open Access Journals (Sweden)

    Toh Weimin

    2014-11-01

    Full Text Available This article focuses on the analysis of emergent gameplay, based on a case study of the author's subjective gameplay experience of Player versus Monster Player (PvMP in The Lord of the Rings Online (LOTRO. The argument presented here is that although there is a core system of Player versus Player (PvP which LOTRO shares with other online games, each type of online game has a specific kind of PvP system which attracts players to engage in the gameplay. For instance, the open world sandbox type of PvP attracts certain players to play in LOTRO's PvMP. One of the main aims of this study is thus to investigate some of the core systems of PvP gameplay in open world sandbox PvP. In this article, LOTRO is shown to offer unique opportunities for studying emergent gameplay in open world games, with particular relevance to PvP studies. Two of the core systems of PvP discussed include the design of the simple gameplay rules to support emergent gameplay, and the community's attitudes towards player's behaviours. The types of emergent gameplay discussed include free play versus negotiated fair play, the players' utilisation of strategies in open world PvP to support collaborative and competitive gameplay, and the changing dynamics of open ended gameplay. It is hoped that the analysis provided in this article would form the­ basis of future work on a more general framework for understanding PvP in other online games.

  18. Synthesis of Polyvinylpyrrolidone (PVP)-Green Tea Extract Composite Nanostructures using Electrohydrodynamic Spraying Technique

    Science.gov (United States)

    Kamaruddin; Edikresnha, D.; Sriyanti, I.; Munir, M. M.; Khairurrijal

    2017-05-01

    Green Tea Extract (GTE) as an active substance has successfully loaded to PVP nanostructures using electrohydrodynamic spraying technique. The precursor solution was the mixture of ethanolic polyvinylpyrrolidone (PVP) with a molecular weight of 1,300 kg/mol and ethanolic GTE solutions at a weight concentration of 4 wt.% and 2 wt.%, respectively, and it was estimated that the entanglement number was 2. The electrospraying was conducted at the voltage of 15 kV, the flow rate of 10 µL/min., and the distance between the collector and the tip of the nozzle of 10 cm. The SEM images showed that the PVP/GTE nanostructures had a combination of agglomerated beads (less spherical particles) and nanofibers. This occurred because if the PVP concentration is low, the PVP/GTE composite has weak core structures that cause the shell to be easily agglomerated each other. The intermolecular interaction between PVP and GTE in the PVP/GTE nanostructures occurred as confirmed by the peak at 3396 cm-1, which is the carboxyl group, proving that the PVP/GTE nanostructures contained water, alcohols, and phenols. The peak at 1040 cm-1, which is the stretching of C-O group in amino acid, gave another proof to the intermolecular interaction.

  19. Two-step fabrication of ZnO-PVP composites with tunable visible emissions

    Science.gov (United States)

    Agulto, Verdad C.; Empizo, Melvin John F.; Kawano, Keisuke; Minami, Yuki; Yamanoi, Kohei; Sarukura, Nobuhiko; Yago, Allan Christopher C.; Sarmago, Roland V.

    2018-02-01

    We report a two-step fabrication of zinc oxide-polyvinylpyrrolidone (ZnO-PVP) composites for potential phosphor-based applications. The composites are fabricated by initially preparing ZnO microrods using hydrothermal growth method and then dip-coating the microrods into aqueous PVP solutions with varying molar concentrations. The as-prepared ZnO microrods exhibit smooth surfaces and broad visible emissions, while the ZnO-PVP composites have pitted surfaces with shifted and reduced visible emissions. These changes in the structural and optical properties, which are found to depend on the PVP concentration, are attributed to the adsorption of PVP on the microrod surface. Although the surface morphology and visible emission are modified by PVP, the composites still maintain a hexagonal wurtzite crystal structure and near-band-edge ultraviolet (UV) emission similar with the as-prepared microrods. Our results therefore suggest that the ZnO-PVP composites can be used as phosphors that offer not only properties found in both ZnO and PVP but also tunable visible emissions which can be controlled during material fabrication.

  20. Nanoparticle formation of poorly water-soluble drugs from ternary ground mixtures with PVP and SDS.

    Science.gov (United States)

    Itoh, Koichi; Pongpeerapat, Adchara; Tozuka, Yuichi; Oguchi, Toshio; Yamamoto, Keiji

    2003-02-01

    Poorly water-soluble drugs N-5159, griseofulvin (GFV), glibenclamide (GBM) and nifedipine (NFP) were ground in a dry process with polyvinylpyrrolidone (PVP) and sodium dodecyl sulfate (SDS). Different crystallinity behavior of each drug during grinding was shown in the ternary Drug/PVP/SDS system. However, when each ternary Drug/PVP/SDS ground mixture was added to distilled water, crystalline nanoparticles which were 200 nm or less in size were formed and had excellent stability. Zeta potential measurement suggested that the nanoparticles had a structure where SDS was adsorbed onto the particles that were formed by the adsorption of PVP on the surface of drug crystals. Stable existence of crystalline nanoparticles was attributable to the inhibition of aggregation caused by the adsorption of PVP and SDS on the surface of drug crystals. Furthermore, the electrostatic repulsion due to the negative charge of SDS on a shell of nanoparticles could be assumed to contribute to the stable dispersion.

  1. Slug-tests in PP- and PVP-holes at Olkiluoto in 2005

    Energy Technology Data Exchange (ETDEWEB)

    Tammisto, E. [Poeyry Environment Oy, Vantaa (Finland); Lehtinen, A. [Posiva Oy, Helsinki (Finland)

    2006-11-15

    As part of the program for the final disposal of the nuclear fuel waste, Posiva Oy investigates the hydrological conditions at the Olkiluoto island. The hydraulic conductivity in the shallow holes OL-PP5, OL-PP9, OL-PP39, OL-PVP4A, OLPVP4B, OL-PVP13, OL-PVP14, OL-PVP17, OL-PVP18A, OL-PVP18B, OL-PVP19 and OL-PVP20 was measured in summer 2005. The length of PP-holes varies between 12 and 15 m, and the test sections (1 m) are located in the bedrock. PVP-tubes have a length up to 17 m, and the test sections (1 - 4 m) are located in the overburden. The measurements were done using the slug-test technique. In the slug-test, the hydraulic head in the borehole is abruptly changed either by pouring water into the borehole or by lowering the pressure sensor. The conductivity is interpreted based on the recovery of the water level. This report presents the field measurements and their interpretation. The interpretation has been done using the Hvorslev's method, and for reference conductivity has also been calculated according to Thiem's equation. According to the results, hydraulic conductivity in PP-holes ranges from 10{sup -9} m/s to 10{sup -5} m/s and in PVP-tubes from 10{sup -7} m/s to 10{sup -4} m/s. The range is similar as observed in measurements of years 2002 and 2004. Expect few test sections, the results from 2005 are close to ones measured in the same sections in 2002 and 2004. The results agree also with hydraulic conductivity interpreted from the pre-pumping done in connection with the groundwater sampling. (orig.)

  2. Slug-tests in PP- and PVP-holes at Olkiluoto in 2004

    Energy Technology Data Exchange (ETDEWEB)

    Tammisto, E.; Hellae, P. [JP-Fintact Oy, Vantaa (Finland); Lahdenperae, J. [Posiva Oy, Helsinki (Finland)

    2005-12-15

    As part of the program for the final disposal of the nuclear fuel waste, Posiva Oy investigates the hydrological conditions at the Olkiluoto island. The hydraulic conductivity in the shallow holes PP2, PP38 and PP39 were measured in July 2004 and PVP4A, PVP4B and PVP14 in June 2004, PVP11, PVP12 and PVP13 in December 2004 and PVP2 in January 2005. The length of PP-holes varies between 13 and 24 m and the measured sections (1 m) are located in the bedrock. PVP-holes have a length up to 10 m and the measured sections (2 m) are located in the overburden. The measurements were conducted using the slug-test technique. In the slug-test the hydraulic head in the borehole is abruptly changed either by pouring water in the borehole or by lowering the pressure sensor. The conductivity is interpreted based on the recovery of the water level. This report presents the field measurements and their interpretation. The interpretation has been done using the Hvorslev's method, but for the control also Thiem's equation was applied. According to the results hydraulic conductivities in PP-holes range from 10{sup -9} m/s to 10{sup -4} m/s and in PVP-holes from 10{sup -6} m/s to 10{sup -4} m/s. The range is almost the same as in measurements of year 2002. Also the results from holes measured both 2002 and 2004 are very close to each other. The results agree also with hydraulic conductivity information available from the pre-pumping done in connection of the groundwater sampling. (orig.)

  3. Comparative study of PVP hydrogel obtained by reaction of fenton and gamma radiation; Estudo comparativo de hidrogel de PVP obtido por reacao de fenton e radiacao gama

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Mariana L.; Rogero, Sizue O.; Lugao, Ademar B., E-mail: marilsilva@hotmail.co [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2009-07-01

    Polyvinylpyrrolidone (PVP) is a polymeric matrix having the capacity to absorb great quantity of water without solving and, due to this property can be used as matrix to compose a pharmaceutical controlled liberation system. In these work, PVP hydrogels were prepared solving the polymer under different concentrations (8%, 10%, 15% and 20%) in phosphate tampon solutions, promoting the reticulation through two methods: by chemical reaction (Fenton reaction), and by ionizing radiation. The objective of this study was to compare the PVP hydrogels obtained by the two types of reation analysing the gel fraction and the tumescence of the obtained samples. With the hydrogel reticulations with Fenton reaction, all the hydrogels obtained in p H 2.5 present good properties, being that by ionizing radiation only the 15 and 20% of PVP in both p H. Therefore, the comparative study was performed with samples of 15 and 20% of PVP, under tampon phosphate of p H 2.5 by reticulated by gamma radiation, for that presented equivalent properties

  4. Thermally stimulated nonlinear refraction in gelatin stabilized Cu-PVP nanocomposite thin films

    Energy Technology Data Exchange (ETDEWEB)

    Tamgadge, Y. S., E-mail: ystamgadge@gmail.com; Atkare, D. V. [Department of Physics, Mahatma Fule Arts, Commerce & SitaramjiChoudhari Science College, Warud, Dist. Amravati (MS), India-444906 (India); Pahurkar, V. G.; Muley, G. G., E-mail: gajananggm@yahoo.co.in [Department of Physics, SantGadge Baba Amravati University, Amravati (MS), India-444602 (India); Talwatkar, S. S. [Department of Physics, D K Marathe and N G Acharya College, Chembur, Mumbai (MS), India-440071 (India); Sunatkari, A. L. [Department of Physics, Siddharth College of Arts, Science and Commerce, Fort, Mumbai (MS), India-440001 (India)

    2016-05-06

    This article illustrates investigations on thermally stimulated third order nonlinear refraction of Cu-PVP nanocomposite thin films. Cu nanoparticles have been synthesized using chemical reduction method and thin films in PVP matrix have been obtained using spin coating technique. Thin films have been characterized by X-ray diffraction (XRD) and Ultraviolet-visible (UV-vis) spectroscopyfor structural and linear optical studies. Third order nonlinear refraction studies have been performed using closed aperture z-scan technique under continuous wave (CW) He-Ne laser. Cu-PVP nanocomposites are found to exhibit strong nonlinear refractive index stimulated by thermal lensing effect.

  5. Effect of solvent and PVP on electrode conductivity in laser-induced reduction process

    Science.gov (United States)

    Lee, Huseung; Yang, Minyang

    2015-04-01

    Laser sintering process is a promising technique which can sinter an electrode pattern selectively without mask. In this study, metal oxide nanoparticle with several solvents and various molar ratio of polyvinylpyrrolidone (PVP) is prepared to optimize a fabrication of a copper electrode pattern. As a result, the solvent with exothermic heat flow and low absorption cross-section shows better pattern shape and higher conductivity in selective laser sintering. Additionally, PVP, a reductant, affects to the quality of electrode, too. High molar ratio and large amount of PVP make the laser sintering process window broad and the specific resistivity low.

  6. Electrical and Thermal Characterization of Electrospun PVP Nanocomposite Fibers

    Directory of Open Access Journals (Sweden)

    Waseem S. Khan

    2013-01-01

    Full Text Available Polyvinylpyrrolidone (PVP solutions incorporated with multiwall carbon nanotubes (MWCNTs were electrospun at various weight percentages, and then the electrical resistance and some thermal properties of these nanocomposite fibers were determined using a high-accuracy electrical resistance measurement device. During the electrospinning process, system and process parameters, such as concentrations, applied voltage, tip-to-collector distance, and pump speeds, were optimized to receive the consistent nanocomposite fibers. When polymers are used in many industrial applications, they require high electrical and thermal conductivities. Most polymers exhibit low electrical conductivity values; however, in the presence of conductive inclusions, the electrical resistance of the MWCNT fibers was reduced from 50 MΩ to below 5 MΩ, which may be attributed to the higher electrical conductivities of these nanoscale inclusions and fewer voids under the applied loads. This study may open up new possibilities in the field for developing electrically conductive novel nanomaterials and devices for various scientific and technological applications.

  7. Partially decomposed PVP as a surface modification of ZnO, CdO ...

    Indian Academy of Sciences (India)

    2017-06-10

    furnace-assisted method using ethylene gly- col (EG) as a solvent has been employed to obtain metal oxides and metal sulphides nanocatalysts with partial decomposition of the polyvinylpyrrolidone (PVP) cap (P-ZnO, P-CdO, ...

  8. Dielectric and electrical behaviours of polymeric (PEO/PVP):NaIO4 composite for solid electrolytes

    Science.gov (United States)

    Marinov, Y. G.; Hadjichristov, G. B.; Petrov, A. G.; Koduru, H. K.; Marino, L.; Scaramuzza, N.

    2017-01-01

    Composite material prepared from polyethylene oxide (PEO) and polyvinylpyrrolidone (PVP) doped with Sodium (meta)periodate (NaIO4) salt was studied by complex impedance spectroscopy at room temperature. The polymers PEO and PVP were mixed in a weight ratio 70:30 %, and the concentration of the embedded NaIO4 compound was 7.5 wt.%. The effect from NaIO4 filler on the dielectric permittivity of the three-component mixed system was analyzed in the frequency range 0.1 Hz - 1 MHz. As compared with the two-component polymer host PEO/PVP, a distinctly enhanced electrical and dielectrical response and an increase of the value of dielectric constant of the polymeric (PEO/PVP):NaIO4 composite were present. This suggests the potential of this material for soft electronics and applications such as solid electrolytes.

  9. Influence of PVP in magnetic properties of NiSn nanoparticles prepared by polyol method

    Energy Technology Data Exchange (ETDEWEB)

    Bobadilla, L.F., E-mail: lbobadilla@iciq.es [Departamento de Quimica Inorganica e Instituto de Ciencia de Materiales, Centro mixto Universidad de Sevilla-CSIC, Av. Americo Vespucio, 41092 Sevilla (Spain); Garcia, C. [Physics Department, Bogazici University, North Campus KB 331-O, Bebek/Istambul (Turkey); Delgado, J.J. [Departamento de Ciencia de los Materiales e Ingenieria Metalurgica y Quimica Inorganica, Facultad de Ciencias, Universidad de Cadiz, Campus Rio San Pedro, E-11510 Puerto Real, Cadiz (Spain); Sanz, O. [Grupo de Ingenieria Quimica, Departamento de Quimica Aplicada, Facultad de Ciencias Quimicas, UPV/EHU, Paseo Manuel de Lardizabal, 3, 20018 San Sebastian (Spain); Romero-Sarria, F.; Centeno, M.A.; Odriozola, J.A. [Departamento de Quimica Inorganica e Instituto de Ciencia de Materiales, Centro mixto Universidad de Sevilla-CSIC, Av. Americo Vespucio, 41092 Sevilla (Spain)

    2012-11-15

    The influence of PVP on the magnetic properties of NiSn nanoparticles prepared by polyol method has been studied. NiSn nanoparticles exhibit superparamagnetic behavior although there is a ferromagnetic contribution due to particles agglomerated below the blocking temperature. The particle size is controlled by the addiction of PVP in varying amounts. The addition of PVP also favours the particles isolation, narrow the particle size distribution and decrease the interparticle interaction strength increasing the superparamagnetic contribution. - Highlights: Black-Right-Pointing-Pointer Ni{sub x}Sn{sub y} alloys nanoparticles have been prepared by polyol method. Black-Right-Pointing-Pointer NiSn nanoparticles exhibit superparamagnetic behavior. Black-Right-Pointing-Pointer The PVP addition favours the particles isolation.

  10. Enhancing Photocatalytic Degradation of Methyl Blue Using PVP-Capped and Uncapped CdSe Nanoparticles

    Directory of Open Access Journals (Sweden)

    Kgobudi Frans Chepape

    2017-01-01

    Full Text Available Quantum confinement of semiconductor nanoparticles is a potential feature which can be interesting for photocatalysis, and cadmium selenide is one simple type of quantum dot to use in the following photocatalytic degradation of organic dyes. CdSe nanoparticles capped with polyvinylpyrrolidone (PVP in various concentration ratios were synthesized by the chemical reduction method and characterized. The transmission electron microscopy (TEM analysis of the samples showed that 50% PVP-capped CdSe nanoparticles were uniformly distributed in size with an average of 2.7 nm and shape which was spherical-like. The photocatalytic degradation of methyl blue (MB in water showed efficiencies of 31% and 48% when using uncapped and 50% PVP-capped CdSe nanoparticles as photocatalysts, respectively. The efficiency of PVP-capped CdSe nanoparticles indicated that a complete green process can be utilized for photocatalytic treatment of water and waste water.

  11. Synthesis and characterization of semi-IPNs based on PVP and PLLA; Sintese e caracterizacao de semi-IPNs envolvendo os homopolimeros PVP e PLLA

    Energy Technology Data Exchange (ETDEWEB)

    Camilo, A.P.R.; Mano, V., E-mail: mano@ufsj.edu.b [Universidade Federal de Sao Joao del Rei (UFSJ), MG (Brazil). Dept. de Ciencias Naturais; Felisberti, M.I. [Universidade Estadual de Campinas (IQ/UNICAMP), SP (Brazil). Inst. de Quimica

    2010-07-01

    The specific interest in the synthesis of semi-IPNs based on PLLA and PVP homopolymers due to the fact these are biodegradable and biocompatible, which allows us to infer applications in the medical field as sutures, implants, matrices for controlled release of drugs etc. The objective was to prepare a multicomponent material amphiphile in the form of semi-interpenetrating polymer networks, based on poly (L-lactide), PLLA, hydrophobic homopolymer, and poly (vinylpyrrolidone), PVP, hydrophilic component. The preparation of semi-IPN combined the polymerization and crosslinking of N-vinylpyrrolidone in the presence of poly (L-lactide). The products were characterized by spectroscopic and thermal methods. (author)

  12. Supercritical CO2-assisted preparation of ibuprofen loaded PEG-PVP complexes

    CSIR Research Space (South Africa)

    Labuschagne, Philip W

    2010-06-01

    Full Text Available 60 61 62 63 64 65 soluble polymer. Examples of such systems that have been successfully produced with supercritical CO2 as processing medium are: ibuprofen impregnated into ?- cyclodextrin [17,18] , PVP [10] and lipid composites [19...] ; ketoprofen impregnated into ?-cyclodextrin [20] and PLGA [21] ; indomethacin impregnated into HPBCD [22] , PVP [13] , chitosan [14] , poly(sebacic anhydride) [23] and PLLA/PLGA [24] , and budesonide impregnated into HPBCD [22] . Impregnation...

  13. The Cathinones MDPV and α-PVP Elicit Different Behavioral and Molecular Effects Following Acute Exposure.

    Science.gov (United States)

    Giannotti, Giuseppe; Canazza, Isabella; Caffino, Lucia; Bilel, Sabrine; Ossato, Andrea; Fumagalli, Fabio; Marti, Matteo

    2017-11-01

    Since the mid-to-late 2000s, synthetic cathinones have gained popularity among drug users due to their psychostimulant effects greater than those produced by cocaine and amphetamine. Among them, 3,4-methylenedioxypyrovalerone (MDPV) and 1-phenyl-2-(pyrrolidin-1-yl)pentan-1-one (α-PVP) are ones of the most popular cathinones available in the clandestine market as "bath salts" or "fertilizers." Pre-clinical studies indicate that MDPV and α-PVP induced psychomotor stimulation, affected thermoregulation, and promoted reinforcing properties in rodents. However, a direct comparative analysis on the effects caused by MDPV and α-PVP on the behavior and neuronal activation in rodents is still lacking. Behavioral analyses revealed that both MDPV and α-PVP affect spontaneous and stimulated motor responses. In particular, MDPV showed a greater psychomotor effect than α-PVP in line with its higher potency in blocking the dopamine transporter (DAT). Notably, MDPV was found to be more effective than α-PVP in facilitating spontaneous locomotion and it displayed a biphasic effect in contrast to the monophasically stimulated locomotion induced by α-PVP. In addition to the behavioral results, we also found a different modulation of immediate early genes (IEGs) such as Arc/Arg3.1 and c-Fos in the frontal lobe, striatum, and hippocampus, indicating that these drugs do impact brain homeostasis with changes in neuronal activity that depend on the drug, the brain area analyzed, and the timing after the injection. These results provide the first discrimination between MDPV and α-PVP based on behavioral and molecular data that may contribute to explain, at least in part, their toxicity.

  14. The dynamic magnetoviscoelastic properties of biomineralized (Fe3O4) PVP-CMC hydrogel

    Science.gov (United States)

    Ray, Ayan; Saha, Nabanita; Saha, Petr

    2017-05-01

    The Polyvinylpyrrolidone (PVP) and carboxymethylcellulose (CMC) based polymer matrix was used as a template for the preparation of magnetic hydrogel. This freshly prepared PVP-CMC hydrogel template was successfully mineralized by in situ synthesis of magnetic nanoparticles (Fe3O4) via chemical co-precipitation reaction using liquid diffusion method. The present study emphasizes on the rheological behavior of non-mineralized and mineralized PVP-CMC hydrogels. Scanning Electron Microscopy (SEM), transmission electron microscopy (TEM), X-ray Diffraction (XRD) pattern, Fourier transform infrared spectroscopy (FT-TR), Vibrating sample magnetometer (VSM) and dynamic magneto rheometer were used to study the morphological, physical, chemical and magnetic properties of nanoparticle (Fe3O4) filled PVP-CMC hydrogel respectively in order to monitor how Fe3O4 magnetic nanoparticles affects the mechanical properties of the hydrogel network. The storage (G') and loss (G") moduli with a complex viscosity of the system was measured using a parallel plate rheometer. Frequency and amplitude sweep with temperature variation was performed to determine the frequency and amplitude dependent magneto viscoelastic moduli for both hydrogel samples. A strong shear thinning effect was observed in both (non-mineralized and mineralized) PVP-CMC hydrogels, which confirm that Fe3O4 filled magnetic hydrogels, are pseudoplastic in nature. This Fe3O4 filled PVP-CMC hydrogel can be considered as stimuli-responsive soft matter that may be used as an actuator in medical devices.

  15. PVP-b-PEO block copolymers for stable aqueous and ethanolic graphene dispersions.

    Science.gov (United States)

    Perumal, Suguna; Park, Kyung Tae; Lee, Hyang Moo; Cheong, In Woo

    2016-02-15

    The ability to disperse pristine (unfunctionalized) graphene is important for various applications, coating, nanocomposites, and energy related systems. Herein we report that amphiphilic copolymers of poly(4-vinyl pyridine)-block-poly(ethylene oxide) (PVP-b-PEO) are able to disperse graphene with high concentrations about 2.6mg/mL via sonication and centrifugation. Ethanolic and aqueous highly-ordered pyrolytic graphite (HOPG) dispersions with block copolymers were prepared and they were compared with the dispersions stabilized by P-123 Pluronic® (P123) and poly(styrene)-block-poly(ethylene oxide) (PS-b-PEO) synthesized. Transmission electron microscopy, scanning electron microscopy, atomic force microscopy, X-ray diffraction, Raman and UV-visible spectroscopic studies confirmed that PVP-b-PEO block copolymers are better stabilizers for HOPG graphene than P123 and PS-b-PEO. X-ray photoelectron spectroscopy and force-distance (F-d) curve analyses revealed that the nitrogen of vinyl pyridine plays a vital role in better attractive interaction with surface of graphene sheet. Thermogravimetric analysis showed that larger amount of PVP-b-PEO was adsorbed onto graphene with longer poly(4-vinyl pyridine) (PVP) block length and in aqueous medium, respectively, and which was consistent with electrical conductivity decreases. This study presents the dispersion efficiency of graphene using PVP-b-PEO varies substantially depending on the lengths of their hydrophobic (PVP) domains. Copyright © 2015 Elsevier Inc. All rights reserved.

  16. The immunotoxicity of graphene oxides and the effect of PVP-coating.

    Science.gov (United States)

    Zhi, Xiao; Fang, Hongliang; Bao, Chenchen; Shen, Guangxia; Zhang, Jiali; Wang, Kan; Guo, Shouwu; Wan, Tao; Cui, Daxiang

    2013-07-01

    Graphene oxide (GO) immunotoxicity is not clarified well up to date. Herein we reported the effects of GOs with and without polyvinylpyrrolidone (PVP) coating on human immune cells such as dendritic cells (DCs), T lymphocytes and macrophages. Human immune cells such as dendritic cells (DCs), T lymphocytes and macrophages were isolated from health donated bloods, PVP-coating GO (PVP-GO) exhibited lower immunogenicity compared with pure GO on the aspect of inducing differentiation and maturation of dendritic cells (DCs), the levels of secreted TNF-α and IL-1β had no obvious difference between two groups, yet the secretion of IL-6 remained in PVP-coating GO group. In addition, PVP-coating GO delayed significantly the apoptotic process of T lymphocytes, at the same time, and exhibited anti-phagocytosis ability against macrophages and markedly enhanced the physiological activity of macrophages. In conclusion, PVP-coating GO possesses good immunological biocompatibility and immunoenhancement effects in vitro, and is likely to be an available candidate of immunoadjuvant in the future. Copyright © 2013 Elsevier Ltd. All rights reserved.

  17. Active vaccination attenuates the psychostimulant effects of α-PVP and MDPV in rats.

    Science.gov (United States)

    Nguyen, Jacques D; Bremer, Paul T; Ducime, Alex; Creehan, Kevin M; Kisby, Brent R; Taffe, Michael A; Janda, Kim D

    2017-04-01

    Recreational use of substituted cathinones continues to be an emerging public health problem in the United States; cathinone derivatives α-pyrrolidinopentiophenone (α-PVP) and 3,4-methylenedioxypyrovalerone (MDPV), which have been linked to human fatalities and show high potential for abuse liability in animal models, are of particular concern. The objective of this study was to develop an immunotherapeutic strategy for attenuating the effects of α-PVP and MDPV in rats, using drug-conjugate vaccines created to generate antibodies with neutralizing capacity. Immunoconjugates (α-PVP-KLH and MDPV-KLH) or the control carrier protein, keyhole limpet hemocyanin (KLH), were administered to groups (N = 12) of male Sprague-Dawley rats on Weeks 0, 2 and 4. Groups were administered α-PVP or MDPV (0.0, 0.25, 0.5, 1.0, 5.0 mg/kg, i.p.) in acute drug challenges and tested for changes in wheel activity. Increased wheel activity produced by α-PVP or MDPV in the controls was attenuated in the α-PVP-KLH and MDPV-KLH vaccinated groups, respectively. Rectal temperature decreases produced by MDPV in the controls were reduced in duration in the MDPV-KLH vaccine group. A separate group (N = 19) was trained to intravenously self-administer α-PVP (0.05, 0.1 mg/kg/inf) and vaccinated with KLH or α-PVP-KLH, post-acquisition. Self-administration in α-PVP-KLH rats was initially higher than in the KLH rats but then significantly decreased following a final vaccine booster, unlike the stable intake of KLH rats. The data demonstrate that active vaccination provides functional protection against the effects of α-PVP and MDPV, in vivo, and recommend additional development of vaccines as potential therapeutics for mitigating the effects of designer cathinone derivatives. Copyright © 2016 Elsevier Ltd. All rights reserved.

  18. Cysteine could change the transport mechanism of PVP-coated silver nanoparticles in porous media

    Science.gov (United States)

    Yang, X.; Lin, S.; Wiesner, M.

    2012-12-01

    Silver nanoparticles (AgNPs) can hardly be removed by wastewater treatment plant and have big potential to enter groundwater, jeopardizing the water quality & aquatic ecosystem. Most AgNPs have surface coatings such as polyvinylpyrrolidone (PVP) which dominate their transport in porous media. Our previous study shows that PVP may promote the deposition of AgNPs on silica surface by a bridging mechanism. This study further explored how cysteine, a natural organic matter type, may influence the role of the PVP coating on AgNP translocation. Dynamic Light Scattering (DLS) measurement (Figure 1A) shows that the PVP coating rendered the AgNP dispersion high stability during the measuring period (3hrs). Addition of 100 ppm cysteine to the dispersion resulted in a rapid decrease in particle size from 100nm to 52nm within one hour, following which no further decline in particle size occurred. Column experiment results (Figure 1B) show that corresponding to the particle size change was a substantial decrease in particle deposition rates: introduction of 100 ppm cysteine into the particle dispersion resulted in a decrease in AgNP attenuation by the porous medium from 67% to 26%. The decline in particle size suggested that cysteine may have displaced the macromolecular PVP from the particle surface. Desorption of PVP resulted in a weakening or vanish of polymer bridging effect which in turn lowered the deposition rates substantially. This study demonstrated an implication of environmental transformation of coated AgNPs to their mobility in saturated sand aquifers. Acknowledgment Xinyao Yang appreciates the Natural Science Foundation of China (Grant No.:41101475) for covering the registration fee and traveling costs.igure 1 Particle size measurement (A) and breakthrough curves (B) of PVP-coated silver nanoparticle in the absence and presence of cysteine: pH=7.0, ionic strength=1mM, flow rate=1ml/min.

  19. Effect of Core–Shell Ceria/Poly(vinylpyrrolidone (PVP Nanoparticles Incorporated in Polymer Films and Their Optical Properties

    Directory of Open Access Journals (Sweden)

    Woosuck Shin

    2013-05-01

    Full Text Available We fabricated hybrid films of pentaerythritol triacrylate (PETA with core–shell ceria/poly(vinylpyrrolidone (PVP nanoparticles, which consist of cerium oxide as the core and PVP as the shell, and investigated the film optical properties. In this study, we used ceria/PVP nanoparticles with average diameters of 37, 49 and 91 nm. We obtained translucent films consisting of PETA with core–shell ceria/PVP nanoparticles. The core–shell ceria/PVP nanoparticles can reduce the transmittance of near-ultraviolet light. The transmittance of visible light and haze values depends not only on the thickness of the films, but also on the average diameter of the nanoparticles. A SEM observation and the optical analyses prove that the core–shell ceria/PVP nanoparticles do not aggregate into the PETA matrix.

  20. Measurement of clay surface areas by polyvinylpyrrolidone (PVP) sorption and its use for quantifying illite and smectite abundance

    Science.gov (United States)

    Blum, A.E.; Eberl, D.D.

    2004-01-01

    A new method has been developed for quantifying smectite abundance by sorbing polyvinylpyrrolidone (PVP) on smectite particles dispersed in aqueous solution. The sorption density of PVP-55K on a wide range of smectites, illites and kaolinites is ???0.99 mg/m2, which corresponds to ???0.72 g of PVP-55K per gram of montmorillonite. Polyvinylpyrrolidone sorption on smectites is independent of layer charge and solution pH. PVP sorption on Si02, Fe 2O3 and ZnO normalized to the BET surface area is similar to the sorption densities on smectites. ??-Al 2O3, amorphous Al(OH)3 and gibbsite have no PVP sorption over a wide range of pH, and sorption of PVP by organics is minimal. The insensitivity of PVP sorption densities to mineral layer charge, solution pH and mineral surface charge indicates that PVP sorption is not localized at charged sites, but is controlled by more broadly distributed sorption mechanisms such as Van der Waals' interactions and/or hydrogen bonding. Smectites have very large surface areas when dispersed as single unit-cell-thick particles (???725 m2/g) and usually dominate the total surface areas of natural samples in which smectites are present. In this case, smectite abundance is directly proportional to PVP sorption. In some cases, however, the accurate quantification of smectite abundance by PVP sorption may require minor corrections for PVP uptake by other phases, principally illite and kaolinite. Quantitative XRD can be combined with PVP uptake measurements to uniquely determine the smectite concentration in such sample. ?? 2004, The Clay Minerals Society.

  1. Cytotoxic and proinflammatory effects of PVP-coated silver nanoparticles after intratracheal instillation in rats

    Directory of Open Access Journals (Sweden)

    Nadine Haberl

    2013-12-01

    Full Text Available Silver nanoparticles (AgNP are among the most promising nanomaterials, and their usage in medical applications and consumer products is growing rapidly. To evaluate possible adverse health effects, especially to the lungs, the current study focused on the cytotoxic and proinflammatory effects of AgNP after the intratracheal instillation in rats. Monodisperse, PVP-coated AgNP (70 nm showing little agglomeration in aqueous suspension were instilled intratracheally. After 24 hours, the lungs were lavaged, and lactate dehydrogenase (LDH, total protein, and cytokine levels as well as total and differential cell counts were measured in the bronchoalveolar lavage fluid (BALF. Instillation of 50 µg PVP-AgNP did not result in elevated LDH, total protein, or cytokine levels in BALF compared to the control, whereas instillation of 250 µg PVP-AgNP caused a significant increase in LDH (1.9-fold and total protein (1.3-fold levels as well as in neutrophil numbers (60-fold of BALF. Furthermore, while there was no change in BALF cytokine levels after the instillation of 50 µg PVP-AgNP, instillation of 250 µg PVP-AgNP resulted in significantly increased levels of seven out of eleven measured cytokines. These finding suggest that exposure to inhaled AgNP can induce moderate pulmonary toxicity, but only at rather high concentrations.

  2. Optimasi Tablet Levofloksasin yang Mengandung Bahan Pengikat PVP K-30 dan Disintegran Vivasol

    Directory of Open Access Journals (Sweden)

    Dina Ayu Fatmawati

    2017-12-01

    Full Text Available The aim of this research was to get optimal formula of levofloxacin tablet prepared with variation of PVP K-30 as binder and vivasol as disintegrant. The making of levofloxacin tablets was done by wet granulation. Tablet was prepared with various levels of PVP K-30 and disintegrant vivasol, compressed using a hydraulic press with 12 mm punch diameter, for 3 seconds. Physical quality (hardness, friability, and disintegration time and dissolution rate of tablet was evaluated. The optimization of the formula was done by factorial design of 22 factorial experiments with 2 factors (PVP K-30 and vivasol and 2 levels (2% and 4%. Optimization results showed that elevated levels of PVP K-30 increased tablet hardness, reduced friability of tablet, decreased disintegrating time, and increased dissolution rate of levofloxacin tablets. Meanwhile, elevated levels of vivasol increased the hardness of tablets, decreased the disintegrating time of tablets, decreased the dissolution rate of levofloxacin tablets, but did not affect the friability of tablets. In conclusion, the optimal tablet that meet the specifications of physical quality (hardness, friability, and disintegrating time and dissolution rate was made by 2.4 to 3.7% of PVP K-30 and 2.0 to 3.2% vivasol as shown in the feasible area of design space.

  3. 32 CFR 644.68 - Title Clearance-Certificate of Title and Title Insurance.

    Science.gov (United States)

    2010-07-01

    ... 32 National Defense 4 2010-07-01 2010-07-01 true Title Clearance-Certificate of Title and Title... (CONTINUED) REAL PROPERTY REAL ESTATE HANDBOOK Acquisition Procurement of Title Evidence, Title Clearance, and Closings § 644.68 Title Clearance—Certificate of Title and Title Insurance. (a) Curative action...

  4. Simple Synthesis and Luminescence Characteristics of PVP-Capped GeO2 Nanoparticles

    Directory of Open Access Journals (Sweden)

    Wei Wu

    2011-01-01

    Full Text Available Polyvinylpyrrolidone (PVP-capped rutile GeO2 nanoparticles were synthesized through a facile hydrothermal process. The obtained nanoparticles were characterized by X-ray diffraction (XRD, transmission electron microscopy (TEM, Fourier transform infrared spectroscopy (FTIR, thermo gravimetric analysis (TGA, and photoluminescence spectroscopy (PL. The capped GeO2 nanoparticles showed significantly enhanced luminescence properties compared with those of the uncapped ones. We attributed this result to the effect of reducing surface defects and enhancing the possibility of electron-hole recombination of the GeO2 nanoparticles by the PVP molecules. PVP-capped GeO2 nanoparticles have potential application in optical and electronic fields.

  5. Nonlinear optical properties of hybridized CdS/ZnS-PVP sols

    Science.gov (United States)

    Kulagina, A. S.; Evstropiev, S. K.; Khrebtov, A. I.

    2017-11-01

    Hybrid composites of CdS-core ZnS-shell nanoparticles embedded in polyvinylpyrrolidone (PVP) matrixes have been prepared and characterized. Cadmium sulfide (CdS) nanocrystals were grown in water-propanol-2 solutions containing high-molecular (Ms=1300000) polyvinylpyrrolidone (PVP) at room temperature using cadmium nitrate and sodium sulfide as the cadmium and sulfur sources, respectively. The CdS/ZnS-PVP suspensions have promising optical properties for nanocomposite films based on. Nonlinear optical properties of diluted CdS/ZnS sols were studied at 532 nm and 5 ns laser pulses by using the Z-scan technique. Dependence of the nonlinear-optical coefficients on the CdS weight has been obtained.

  6. Biodegradation of PVP-CMC hydrogel film: a useful food packaging material.

    Science.gov (United States)

    Roy, Niladri; Saha, Nabanita; Kitano, Takeshi; Saha, Petr

    2012-06-20

    Hydrogels can offer new opportunities for the design of efficient packaging materials with desirable properties (i.e. durability, biodegradability and mechanical strength). It is a promising and emerging concept, as most of the biopolymer based hydrogels are supposed to be biodegradable, they can be considered as alternative eco-friendly packaging materials. This article reports about synthetic (polyvinylpyrrolidone (PVP)) and biopolymer (carboxymethyl cellulose (CMC)) based a novel hydrogel film and its nature of biodegradability under controlled environmental condition. The dry hydrogel films were prepared by solution casting method and designated as 'PVP-CMC hydrogel films'. The hydrogel film containing PVP and CMC in a ratio of 20:80 shows best mechanical properties among all the test samples (i.e. 10:90, 20:80, 50:50, 80:20 and 90:10). Thus, PVP-CMC hydrogel film of 20:80 was considered as a useful food packaging material and further experiments were carried out with this particular hydrogel film. Biodegradation of the PVP-CMC hydrogel films were studied in liquid state (Czapec-Dox liquid medium+soil extracts) until 8 weeks. Variation in mechanical, viscoelastic properties and weight loss of the hydrogel films with time provide the direct evidence of biodegradation of the hydrogels. About 38% weight loss was observed within 8 weeks. FTIR spectra of the hydrogel films (before and after biodegradation) show shifts of the peaks and also change in the peak intensities, which refer to the physico-chemical change in the hydrogel structure and SEM views of the hydrogels show how internal structure of the PVP-CMC film changes in the course of biodegradation. Copyright © 2012 Elsevier Ltd. All rights reserved.

  7. Title IX Resource Guide

    Science.gov (United States)

    Office for Civil Rights, US Department of Education, 2015

    2015-01-01

    Title IX of the Education Amendments of 1972 (Title IX) prohibits discrimination based on sex in education programs and activities in federally funded schools at all levels. If any part of a school district or college receives any Federal funds for any purpose, all of the operations of the district or college are covered by Title IX. The essence…

  8. Stable and Fast-Response Capacitive Humidity Sensors Based on a ZnO Nanopowder/PVP-RGO Multilayer

    Directory of Open Access Journals (Sweden)

    Hui Yang

    2017-10-01

    Full Text Available In this paper, capacitive-type humidity sensors were prepared by sequentially drop-coating the aqueous suspensions of zinc oxide (ZnO nanopowders and polyvinyl pyrrolidone–reduced graphene oxide (PVP-RGO nanocomposites onto interdigitated electrodes. Significant improvements in both sensitivity and linearity were achieved for the ZnO/PVP-RGO sensors compared with the PVP-RGO/ZnO, PVP-RGO, and ZnO counterparts. Moreover, the produced ZnO/PVP-RGO sensors exhibited rather small hysteresis, fast response-recovery time, and long-term stability. Based on morphological and structural analyses, it can be inferred that the excellent humidity sensing properties of the ZnO/PVP-RGO sensors may be attributed to the high surface-to-volume ratio of the multilayer structure and the supporting roles of the PVP-RGO nanocomposites. The results in this work hence provide adequate guidelines for designing high-performance humidity sensors that make use of the multilayer structure of semiconductor oxide materials and PVP-RGO nanocomposites.

  9. Stable and Fast-Response Capacitive Humidity Sensors Based on a ZnO Nanopowder/PVP-RGO Multilayer.

    Science.gov (United States)

    Yang, Hui; Ye, Qiangqiang; Zeng, Ruixue; Zhang, Junkai; Yue, Lei; Xu, Ming; Qiu, Zhi-Jun; Wu, Dongping

    2017-10-23

    In this paper, capacitive-type humidity sensors were prepared by sequentially drop-coating the aqueous suspensions of zinc oxide (ZnO) nanopowders and polyvinyl pyrrolidone-reduced graphene oxide (PVP-RGO) nanocomposites onto interdigitated electrodes. Significant improvements in both sensitivity and linearity were achieved for the ZnO/PVP-RGO sensors compared with the PVP-RGO/ZnO, PVP-RGO, and ZnO counterparts. Moreover, the produced ZnO/PVP-RGO sensors exhibited rather small hysteresis, fast response-recovery time, and long-term stability. Based on morphological and structural analyses, it can be inferred that the excellent humidity sensing properties of the ZnO/PVP-RGO sensors may be attributed to the high surface-to-volume ratio of the multilayer structure and the supporting roles of the PVP-RGO nanocomposites. The results in this work hence provide adequate guidelines for designing high-performance humidity sensors that make use of the multilayer structure of semiconductor oxide materials and PVP-RGO nanocomposites.

  10. Effects of Nanoparticle Size on Cellular Uptake and Liver MRI with PVP-Coated Iron Oxide Nanoparticles

    Science.gov (United States)

    Huang, Jing; Bu, Lihong; Xie, Jin; Chen, Kai; Cheng, Zhen; Li, Xingguo; Chen, Xiaoyuan

    2010-01-01

    The effect of nanoparticle size (30–120 nm) on magnetic resonance imaging (MRI) of hepatic lesions in vivo has been systematically examined using polyvinylpyrrolidone (PVP)-coated iron oxide nanoparticles (PVP-IOs). Such biocompatible PVP-IOs with different sizes were synthesized by a simple one-pot pyrolysis method. These PVP-IOs exhibited good crystallinity and high T2 relaxivities, and the relaxivity increased with the size of the magnetic nanoparticles. It was found that cellular uptake changed with both size and surface physiochemical properties, and that PVP-IO-37 with a core size of 37 nm and hydrodynamic particle size of 100 nm exhibited higher cellular uptake rate and greater distribution than other PVP-IOs and Feridex. We systematically investigated the effect of nanoparticle size on MRI of normal liver and hepatic lesions in vivo. The physical and chemical properties of the nanoparticles influenced their pharmacokinetic behavior, which ultimately determined their ability to accumulate in the liver. The contrast enhancement of PVP-IOs within the liver was highly dependent on the overall size of the nanoparticles, and the 100 nm PVP-IO-37 nanoparticles exhibited the greatest enhancement. These results will have implications in designing engineered nanoparticles that are optimized as MR contrast agents or for use in therapeutics. PMID:21043459

  11. Preparation of PVDF porous membranes by using PVDF-g-PVP powder as an additive and their antifouling property

    Science.gov (United States)

    Xu, Chenqi; Huang, Wei; Lu, Xin; Yan, Deyue; Chen, Shutao; Huang, Hua

    2012-11-01

    The hydrophilic PVDF-g-PVP powder was used as additive to prepare a series of PVDF/PVDF-g-PVP blend porous membranes via an immersion precipitation phase inversion process. FTIR-ATR measurements confirmed that the hydrophilic PVP preferentially segregated to the interface between membrane and coagulant. SEM images showed that there was no big change in the membrane cross-section with the amount of PVDF-g-PVP increased. However, the membrane surface roughness increased with the amount of PVDF-g-PVP increased according to AFM data. The mean pore size of membranes reached max when the amount of PVDF-g-PVP was 10 wt%. The water contact angle and filtration experiments revealed that the surface enrichment of PVP endowed the membranes with significantly enhanced surface hydrophilicity and protein-adsorption resistance. The flux recovery of the porous membranes was increased from 37.50% to 77.23% with the amount of PVDF-g-PVP increased from 0 to 50 wt%, also indicating that the antifouling property of the porous membranes was improved.

  12. Synthesis and analysis of Fe 3, Co 2 and Ni 2: PEO+ PVP blended ...

    Indian Academy of Sciences (India)

    Blended polymer films of polyethylene oxide + polyvinyl pyrrolidone (PEO + PVP) containing transition metal (TM) ions like Fe3+, Co2+ and Ni2+ have been synthesized by a solution casting method. For these films, structural, thermal, magnetic and optical properties have been studied. X-ray diffraction results reveal the ...

  13. Temperature and concentration calibration of aqueous polyvinylpyrrolidone (PVP solutions for isotropic diffusion MRI phantoms.

    Directory of Open Access Journals (Sweden)

    Friedrich Wagner

    Full Text Available To use the "apparent diffusion coefficient" (Dapp as a quantitative imaging parameter, well-suited test fluids are essential. In this study, the previously proposed aqueous solutions of polyvinylpyrrolidone (PVP were examined and temperature calibrations were obtained. For example, at a temperature of 20°C, Dapp ranged from 1.594 (95% CI: 1.593, 1.595 μm2/ms to 0.3326 (95% CI: 0. 3304, 0.3348 μm2/ms for PVP-concentrations ranging from 10% (w/w to 50% (w/w using K30 polymer lengths. The temperature dependence of Dapp was found to be so strong that a negligence seems not advisable. The temperature dependence is descriptively modelled by an exponential function exp(c2 (T - 20°C and the determined c2 values are reported, which can be used for temperature calibration. For example, we find the value 0.02952 K-1 for 30% (w/w PVP-concentration and K30 polymer length. In general, aqueous PVP solutions were found to be suitable to produce easily applicable and reliable Dapp-phantoms.

  14. Influence of PVP molecular weight on the microwave assisted in situ amorphization of indomethacin

    DEFF Research Database (Denmark)

    Doreth, Maria; Löbmann, Korbinian; Priemel, Petra

    2018-01-01

    In situ amorphization is an approach that enables a phase transition of a crystalline drug to its amorphous form immediately prior to administration. In this study, three different polyvinylpyrrolidones (PVP K12, K17 and K25) were selected to investigate the influence of the molecular weight of t...

  15. Characterization and stability of ternary solid dispersions with PVP and PHPMA.

    Science.gov (United States)

    Al-Obaidi, Hisham; Ke, Peng; Brocchini, Steve; Buckton, Graham

    2011-10-31

    The effect of adding a third polymer to immiscible binary solid dispersions was investigated. The model actives griseofulvin (GF), progesterone (PG) and phenindione (PD) were selected because they exemplify a key property of many poorly soluble molecules of having at least one hydrogen bonding acceptor moiety while not having any hydrogen bond donating moieties. Ternary solid dispersions of the drug, PVP (polyvinylpyrrolidone) (proton acceptor) and PHPMA (poly[2-hydroxypropyl methacrylate]) (proton acceptor and donor) were prepared by spray drying. Stability results showed that binary solid dispersions (API and PVP) of GF and PVP crystallized quickly while the amorphous form was not possible to prepare for PG and PD. The amorphous form was prolonged upon the incorporation of PHPMA in the solid dispersion (API, PHPMA and PVP). Based on measuring the melting points, the energy of mixing the drug with the polymer was calculated using the Flory-Huggins theory. The results showed that GF had the lowest free energy followed by PG and finally PD which agreed well with the stability results. These results suggest that the addition of a third polymer to immiscible binary solid dispersions can significantly improve the stability of the amorphous form. Copyright © 2011 Elsevier B.V. All rights reserved.

  16. Novel GQD-PVP-CdS composite with enhanced visible-light-driven photocatalytic properties

    Energy Technology Data Exchange (ETDEWEB)

    Fan, Tao; Li, Yinle; Shen, Jianfeng, E-mail: jfshen@fudan.edu.cn; Ye, Mingxin, E-mail: mxye@fudan.edu.cn

    2016-03-30

    Graphical abstract: - Highlights: • GQD-PVP-CdS composite was prepared for the first time through a facile hydrothermal route. • GQD-PVP-CdS demonstrated outstanding photoactivity under visible light illumination. • GQDs and polymeric material are compounded with CdS nanoparticles simultaneously for the first time. • The addition of GQDs plays pivotal roles in the enhancement of the photoactivity. - Abstract: A facile one-step hydrothermal method to synthesize graphene quantum dots (GQDs)-polyvinyl pyrrolidone (PVP)-CdS nanocomposite was reported. The nanocomposite was thoroughly characterized with X-ray diffraction, transmission electron microscopy, scanning electron microscopy, Fourier-transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and ultraviolet–visible spectroscopy. The results confirmed the formation of GQD-PVP-CdS composite with a uniform size (5–10 nm) and a relatively low band gap (E{sub g} = 2.23 eV). Moreover, the as-prepared composite exhibited enhanced photocatalytic activity toward the degradation of organic contaminants, with 92.3% of methyl orange (10 mg/L) removed after 3 hours of visible light illumination. This enhancement in photocatalytic activity was postulated to be attributed to the upconversion property of GQDs and a more efficient charge distribution between GQDs and CdS particles.

  17. FORMULASI MATRIKS TRANSDERMAL PENTAGAMAVUNON-0 DENGAN KOMBINASI POLIMER PVP K30 DAN HIDROKSIPROPIL METILSELULOSA

    Directory of Open Access Journals (Sweden)

    Beti Pudyastuti

    2016-04-01

    Full Text Available Abstract: Transdermal delivery system is one of the delivery system for Pentagamavunon-0 (PGV-0 to avoid the high intensity of first pass metabolism of PGV-0 in peroral route. The purpose of this research was to optimize the formula of PGV-0 transdermal matrix with a combination of PVP K30 and HPMC polymers.The simplex lattice optimization approach of the transdermal matrix formulas was performed by using Design Expert 7.1.5 software. The visual appearance, weight, thickness, moisture content, moisture uptake, folding endurance, drug content, and dissolution efficiency of the release profil of PGV-0 from the matrix for 6 hours were evaluated as responses to determine optimum formula of matrix. The result showed that a combination of PVP K30 and HPMC polymers had a significant influence on the visual appearance, moisture content, and dissolution efficiency of PGV-0. Combination of 1.98% of PVP K30 and 4.52% of HPMC as the optimum formula could produce homogeneous and flexible matrix with moisture content of 3.21%. The dissolution efficiency was 9.11%, indicating that 101.93 µg of PGV-0 was released from the optimum formula during 6 hours. Keywords : Pentagamavunon-0, Transdermal matrix, PVP K30, HPMC

  18. Temperature and concentration calibration of aqueous polyvinylpyrrolidone (PVP) solutions for isotropic diffusion MRI phantoms.

    Science.gov (United States)

    Wagner, Friedrich; Laun, Frederik B; Kuder, Tristan A; Mlynarska, Anna; Maier, Florian; Faust, Jonas; Demberg, Kerstin; Lindemann, Linus; Rivkin, Boris; Nagel, Armin M; Ladd, Mark E; Maier-Hein, Klaus; Bickelhaupt, Sebastian; Bach, Michael

    2017-01-01

    To use the "apparent diffusion coefficient" (Dapp) as a quantitative imaging parameter, well-suited test fluids are essential. In this study, the previously proposed aqueous solutions of polyvinylpyrrolidone (PVP) were examined and temperature calibrations were obtained. For example, at a temperature of 20°C, Dapp ranged from 1.594 (95% CI: 1.593, 1.595) μm2/ms to 0.3326 (95% CI: 0. 3304, 0.3348) μm2/ms for PVP-concentrations ranging from 10% (w/w) to 50% (w/w) using K30 polymer lengths. The temperature dependence of Dapp was found to be so strong that a negligence seems not advisable. The temperature dependence is descriptively modelled by an exponential function exp(c2 (T - 20°C)) and the determined c2 values are reported, which can be used for temperature calibration. For example, we find the value 0.02952 K-1 for 30% (w/w) PVP-concentration and K30 polymer length. In general, aqueous PVP solutions were found to be suitable to produce easily applicable and reliable Dapp-phantoms.

  19. Thermal stability and electrochemical properties of PVP-protected Ru nanoparticles synthesized at room temperature

    Science.gov (United States)

    Kumar, Manish; Devi, Pooja; Shivling, V. D.

    2017-08-01

    Stable ruthenium nanoparticles (RuNPs) have been synthesized by the chemical reduction of ruthenium trichloride trihydrate (RuCl3 · 3H2O) using sodium borohydride (NaBH4) as a reductant and polyvinylpyrrolidone (PVP) as a protecting agent in the aqueous medium at room temperature. The nanoparticles thus prepared were characterized by their morphology and structural analysis from transmission electron microscopy (TEM), X-ray powder diffraction (XRD), UV-vis spectroscopy, Fourier transformation infrared and thermogravimetric analysis (TGA) techniques. The TEM image suggested a homogeneous distribution of PVP-protected RuNPs having a small average diameter of 2-4 nm with a chain-like network structure. The XRD pattern also confirmed that a crystallite size is around 2 nm of PVP-protected RuNPs having a single broad peak. The thermal stability studied using TGA, indicated good stability and the electrochemical properties of these nanoparticles revealed that saturation current increases for PVP-protected RuNPs/GC.

  20. Anomalous dissolution behavior of celecoxib in PVP/Isomalt solid dispersions prepared using spray drier.

    Science.gov (United States)

    Ghanavati, Roya; Taheri, Azade; Homayouni, Alireza

    2017-03-01

    Celecoxib is a COX II inhibitor NSAID which is used for joint pains, rheumatoid arthritis and osteoarthritis, however due to its poor water solubility it shows very low oral bioavailability. Using solid dispersion formulations is one of the most promising strategies to increase solubility of poorly water soluble drugs. The purpose of this study is dissolution enhancement of celecoxib by preparation of solid dispersions via spray drying technique using PVP and Isomalt as hydrophilic carriers. Different ratios of celecoxib, Isomalt and PVP K30 (7:3:0, 5:5:0, 3:7:0, 1:9:0 and 3:5:2, 3:2:5) were prepared from 2% hydroalcoholic solutions (70:30 ethanol:water) using spray drier. Particle size analyzing, saturation solubility, SEM, DSC, FT-IR, XRPD and dissolution studies in 0.25% SDS and 0.04M Na3HPO4 mediums were performed. Stability of samples was also studied after a week and a month storage at 75% humidity condition. The results showed that the saturation solubility of celecoxib in solid dispersion samples is 20-30 folds higher than raw celecoxib. Similar results have been shown for dissolution studies. Solid state analyses showed glass solution state of celecoxib in PVP/Isomalt matrixes. FTIR studies exhibited the formation of hydrogen bonding between celecoxib and PVP in these samples. Spray dried celecoxib (amorphous celecoxib) without usage of carrier showed lower dissolution rate compare to its crystalline state (in 0.25% SDS dissolution medium) whilst these results is vise versa in Na3PO4 dissolution medium. Interestingly almost all samples exhibited higher dissolution rate (in 0.25% SDS) after storage in 75% humidity. XRPD analysis demonstrated the crystallization of amorphous celecoxib after 1month storage. In general using PVP K30 and Isomalt as hydrophilic carriers could increase solubility and dissolution rate of celecoxib in solid dispersion formulations. Copyright © 2016 Elsevier B.V. All rights reserved.

  1. Standardized comparison of antiseptic efficacy of triclosan, PVP-iodine, octenidine dihydrochloride, polyhexanide and chlorhexidine digluconate.

    Science.gov (United States)

    Koburger, T; Hübner, N-O; Braun, M; Siebert, J; Kramer, A

    2010-08-01

    This study presents a comparative investigation of the antimicrobial efficacy of the antiseptics PVP-iodine, triclosan, chlorhexidine, octenidine and polyhexanide used for pre-surgical antisepsis and antiseptic treatment of skin, wounds and mucous membranes based on internationally accepted standards. MICs and MBCs were determined in accordance with DIN 58940-7 and 58940-8 using Staphylococcus aureus (including methicillin-resistant Staphylococcus aureus), Enterococcus faecalis (including vancomycin-resistant Enterococcus), Streptococcus pneumoniae, Escherichia coli, Pseudomonas aeruginosa, Clostridium perfringens, Haemophilus influenzae and Candida albicans. The microbicidal efficacy was determined in accordance with DIN EN 1040 and 1275 using S. aureus, P. aeruginosa and C. albicans. For chlorhexidine, octenidine and polyhexanide, MIC(48) and MBC(24) ranged from 16 to 32 mg/L. Maximum values for triclosan ranged from 256 to 512 mg/L, with an efficacy gap against P. aeruginosa, while the maximum values of PVP-iodine were 1024 mg/L, with a gap against S. pneumoniae. Comparing the minimal effective concentrations, octenidine was most effective. After 1 min, only octenidine and PVP-iodine fulfil the requirements for antiseptics. Tests under standardized and harmonized conditions help to choose the most efficacious agent. When a prolonged contact time is feasible, ranking of agents would be polyhexanide = octenidine > chlorhexidine > triclosan > PVP-iodine. This is consistent with the recommendations for antisepsis of acute wounds. Polyhexanide seems to be preferable for chronic wounds due to its higher tolerability. If an immediate effect is required, ranking would be octenidine = PVP-iodine> polyhexanide > chlorhexidine > triclosan.

  2. Sustained release of diltiazem HCl tableted after co-spray drying and physical mixing with PVAc and PVP.

    Science.gov (United States)

    Al-Zoubi, Nizar; Al-Obaidi, Ghada; Tashtoush, Bassam; Malamataris, Stavros

    2016-01-01

    In this work, aqueous diltiazem HCl and polyvinyl-pyrrolidone (PVP) solutions were mixed with Kollicoat SR 30D and spray dried to microparticles of different drug:excipient ratio and PVP content. Co-spray dried products and physical mixtures of drug, Kollidon SR and PVP were tableted. Spray drying process, co-spray dried products and compressibility/compactability of co-spray dried and physical mixtures, as well as drug release and water uptake of matrix-tablets was evaluated. Simple power equation fitted drug release and water uptake (R(2) > 0.909 and 0.938, respectively) and correlations between them were examined. Co-spray dried products with PVP content lower than in physical mixtures result in slower release, while at equal PVP content (19 and 29% w/w of excipient) in similar release (f2 > 50). Increase of PVP content increases release rate and co-spray drying might be an alternative, when physical mixing is inadequate. Co-spray dried products show better compressibility/compatibility but higher stickiness to the die-wall compared to physical mixtures. SEM observations and comparison of release and swelling showed that distribution of tableted component affects only the swelling, while PVP content for both co-spray dried and physical mixes is major reason for release alterations and an aid for drug release control.

  3. Solid-state characterization and dissolution properties of meloxicam-moringa coagulant-PVP ternary solid dispersions.

    Science.gov (United States)

    Noolkar, Suhail B; Jadhav, Namdeo R; Bhende, Santosh A; Killedar, Suresh G

    2013-06-01

    The effect of ternary solid dispersions of poor water-soluble NSAID meloxicam with moringa coagulant (obtained by salt extraction of moringa seeds) and polyvinylpyrrolidone on the in vitro dissolution properties has been investigated. Binary (meloxicam-moringa and meloxicam-polyvinylpyrrolidone (PVP)) and ternary (meloxicam-moringa-PVP) systems were prepared by physical kneading and ball milling and characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, and X-ray diffractometry. The in vitro dissolution behavior of meloxicam from the different products was evaluated by means of United States Pharmacopeia type II dissolution apparatus. The results of solid-state studies indicated the presence of strong interactions between meloxicam, moringa, and PVP which were of totally amorphous nature. All ternary combinations were significantly more effective than the corresponding binary systems in improving the dissolution rate of meloxicam. The best performance in this respect was given by the ternary combination employing meloxicam-moringa-PVP ratio of [1:(3:1)] prepared by ball milling, with about six times increase in percent dissolution rate, whereas meloxicam-moringa (1:3) and meloxicam-PVP (1:4) prepared by ball milling improved dissolution of meloxicam by almost 3- and 2.5-folds, respectively. The achieved excellent dissolution enhancement of meloxicam in the ternary systems was attributed to the combined effects of impartation of hydrophilic characteristic by PVP, as well as to the synergistic interaction between moringa and PVP.

  4. Physical stability of solid dispersions with respect to thermodynamic solubility of tadalafil in PVP-VA.

    Science.gov (United States)

    Wlodarski, K; Sawicki, W; Kozyra, A; Tajber, L

    2015-10-01

    The aim of this paper was to evaluate physical stability of solid dispersions in respect to the drug, tadalafil (Td), in vinylpyrrolidone and vinyl acetate block copolymer (PVP-VA). Nine solid dispersions of Td in PVP-VA (Td/PVP-VA) varied in terms of quantitative composition (1:9-9:1, w/w) were successfully produced by spray-drying. Their amorphous nature, supersaturated character and molecular level of mixing (a solid solution structure) were subsequently confirmed using DSC, PXRD, SEM and calculation of Hansen total solubility parameters. Due to thermal degradation of both components before the melting point of Td (302.3°C), an approach based on the drug crystallization from the supersaturated solid dispersion was selected to calculate the solubility of Td in the polymer. Annealing of the Td/PVP-VA solid dispersion (1:1, w/w) at selected temperatures above its Tg resulted in different stable solid dispersions. According to the Gordon-Taylor equation their new Tgs gave the information about the quantitative composition which corresponded to the thermodynamic solubility of Td in PVP-VA at given temperatures of annealing. The obtained relationship was fitted to the exponential function, with the calculated solubility of Td of 20.5% at 25°C. This value was in accordance with the results of hot stage polarizing light microscopy as well as stability tests carried out at 80°C and 0% RH, in which Td solid dispersions containing 10-20% of the drug were the only systems that did not crystallize within two months. A thermal analysis protocol utilizing a fast heating rate was shown to generate Td solubility data complementing the solid dispersion method. The Flory-Huggins model applied for the Td/PVP-VA system yielded the solubility value of 0.1% at 25°C, showing the lack of applicability in this case. Copyright © 2015 Elsevier B.V. All rights reserved.

  5. Fabrication of CH3NH3PbI3/PVP Composite Fibers via Electrospinning and Deposition

    Science.gov (United States)

    Chao, Li-Min; Tai, Ting-Yu; Chen, Yueh-Ying; Lin, Pei-Ying; Fu, Yaw-Shyan

    2015-01-01

    In our study, one-dimensional PbI2/polyvinylpyrrolidone (PVP) composition fibers have been prepared by using PbI2 and PVP as precursors dissolved in N,N-dimethylformamide via a electrospinning process. Dipping the fibers into CH3NH3I solution changed its color, indicating the formation of CH3NH3PbI3, to obtain CH3NH3PbI3/PVP composite fibers. The structure, morphology and composition of the all as-prepared fibers were characterized by using X-ray diffraction and scanning electron microscopy. PMID:28793517

  6. Fabrication of CH3NH3PbI3/PVP Composite Fibers via Electrospinning and Deposition

    Directory of Open Access Journals (Sweden)

    Li-Min Chao

    2015-08-01

    Full Text Available In our study, one-dimensional PbI2/polyvinylpyrrolidone (PVP composition fibers have been prepared by using PbI2 and PVP as precursors dissolved in N,N-dimethylformamide via a electrospinning process. Dipping the fibers into CH3NH3I solution changed its color, indicating the formation of CH3NH3PbI3, to obtain CH3NH3PbI3/PVP composite fibers. The structure, morphology and composition of the all as-prepared fibers were characterized by using X-ray diffraction and scanning electron microscopy.

  7. PVP-Stabilized Palladium Nanoparticles in Silica as Effective Catalysts for Hydrogenation Reactions

    Directory of Open Access Journals (Sweden)

    Caroline Pires Ruas

    2013-01-01

    Full Text Available Palladium nanoparticles stabilized by poly (N-vinyl-2-pyrrolidone (PVP can be synthesized by corresponding Pd(acac2 (acac = acetylacetonate as precursor in methanol at 80°C for 2 h followed by reduction with NaBH4 and immobilized onto SiO2 prepared by sol-gel process under acidic conditions (HF or HCl. The PVP/Pd molar ratio is set to 6. The effect of the sol-gel catalyst on the silica morphology and texture and on Pd(0 content was investigated. The catalysts prepared (ca. 2% Pd(0/SiO2/HF and ca. 0,3% Pd(0/SiO2/HCl were characterized by TEM, FAAS, and SEM-EDS. Palladium nanoparticles supported in silica with a size 6.6 ± 1.4 nm were obtained. The catalytic activity was tested in hydrogenation of alkenes.

  8. Effect of Polymers (PEG and PVP on Sol-Gel Synthesis of Microsized Zinc Oxide

    Directory of Open Access Journals (Sweden)

    Thilagavathi Thirugnanam

    2013-01-01

    Full Text Available Fibers irregular and seed-like microcrystalline ZnO were synthesized by using a cost-effective and low temperature aqueous sol-gel method. Various polymers, namely, polyethylene glycol 6000 (PEG 6000 and polyvinyl pyrrolidone (PVP, were used as structure directing agents. The samples were characterized by X-ray diffraction (XRD, Fourier transform infrared spectroscopy (FTIR, and scanning electron microscopy (SEM. The X-ray diffraction pattern revealed the formation of phase-pure ZnO micropowders. It is observed that the polymers play an important role in modifying the surface morphology and the size of the crystallites. A compact granular morphology is observed for the ZnO samples without polymer. The samples exhibit microparticles of size 100 nm for PVP and for PEG-mediated growth, whereas microporous corrugated morphology is observed for added PEG-mediated micropowder. FTIR study is used to confirm the structural modifications occurring in the polymers.

  9. Characterization and physical stability of spray dried solid dispersions of probucol and PVP-K30

    DEFF Research Database (Denmark)

    Thybo, Pia; Pedersen, Betty L; Hovgaard, Lars

    2008-01-01

    of small-sized amorphous powders dispersed in a hydrophilic polymer. SDs were prepared by spray drying solutions of probucol and different amounts of PVP-K30. The obtained SDs were characterized by dissolution rate measurements in a flow-through apparatus, X-ray Powder Diffraction (XRPD), Differential......The main purpose of this study was to obtain stable, well-characterized solid dispersions (SDs) of amorphous probucol and polyvinylpyrrolidone K-30 (PVP-K30) with improved dissolution rates. A secondary aim was to investigate the flow-through dissolution method for in-vitro dissolution measurements...... weeks. The flow-through method was found suitable as dissolution method. All SDs showed improved in-vitro dissolution rates when compared to starting material and physical mixtures. The greatest improvement in the in-vitro dissolution rate was observed for the highest polymer to drug ratio. By means...

  10. Effect of PVP Intermediate Layer on the Properties of SAPO 34 Membrane

    Directory of Open Access Journals (Sweden)

    Jugal K. Das

    2012-01-01

    Full Text Available SAPO 34 zeolite membranes were prepared on a tubular mullite support. Before membrane preparation, the support surfaces were coated with seed crystals. Seeds particles were prepared by hydrothermal synthesis. Before seeding, the substrates were treated with polyvinylpyrrolidone (PVP to orient the seeds. Both the treated and untreated supports were seeded, and membranes were synthesized on those support tubes by ex situ hydrothermal method. The PVP molecule exists in the two resonance structures. Hence the acylamino bond –N+ = C–O-– acts as intermediate linker between support surface and seed surface. Due to charge interaction, the seed crystals were anchored strongly to support surface. The synthesized membranes along with seed crystals were characterized by XRD, FESEM, and EDAX analysis. The single-gas permeation with CO2 and H2 was investigated. Up to 5 bar of feed pressure, the permselectivity of CO2 and H2 was as high as 4.2.

  11. Vibrational and impedance spectroscopic study on PVP-NH{sub 4}SCN based polymer electrolytes

    Energy Technology Data Exchange (ETDEWEB)

    Ramya, C.S. [Solid State and Radiation Physics Laboratory, Department of Physics, Bharathiar University, Coimbatore-641 046 (India); Selvasekarapandian, S. [Solid State and Radiation Physics Laboratory, Department of Physics, Bharathiar University, Coimbatore-641 046 (India)]. E-mail: sekarapandian@yahoo.com; Savitha, T. [Solid State and Radiation Physics Laboratory, Department of Physics, Bharathiar University, Coimbatore-641 046 (India); Hirankumar, G. [Solid State and Radiation Physics Laboratory, Department of Physics, Bharathiar University, Coimbatore-641 046 (India); Angelo, P.C. [Department of Metallurgical Engineering, P.S.G. College of Technology, Coimbatore-641 004 (India)

    2007-04-30

    Polymer electrolytes based on poly (N-vinyl pyrrolidone) (PVP) and ammonium thiocyanate (NH{sub 4}SCN) prepared by solution cast technique have been studied using X-ray diffraction (XRD), Raman and impedance spectroscopic techniques. The XRD and Raman spectra for the electrolytes indicate that the amorphous nature of PVP increases with the increase of the concentration of ammonium thiocyanate. The spectral changes in the Raman bands of the C=O and the C{identical_to}N stretching indicate the interaction between the salt and the polymer. The conductivity analysis shows that the 20 mol% ammonium thiocyanate doped polymer electrolyte exhibits high ionic conductivity and it has been found to be 1.7x10{sup -4} S cm{sup -1}, at room temperature. The ionic coordination in the polymeric electrolytes, as determined by Raman spectroscopy, has been discussed in relation to the conductance behavior.

  12. Vibrational and impedance spectroscopic study on PVP-NH 4SCN based polymer electrolytes

    Science.gov (United States)

    Ramya, C. S.; Selvasekarapandian, S.; Savitha, T.; Hirankumar, G.; Angelo, P. C.

    2007-04-01

    Polymer electrolytes based on poly ( N-vinyl pyrrolidone) (PVP) and ammonium thiocyanate (NH 4SCN) prepared by solution cast technique have been studied using X-ray diffraction (XRD), Raman and impedance spectroscopic techniques. The XRD and Raman spectra for the electrolytes indicate that the amorphous nature of PVP increases with the increase of the concentration of ammonium thiocyanate. The spectral changes in the Raman bands of the C dbnd O and the C tbnd N stretching indicate the interaction between the salt and the polymer. The conductivity analysis shows that the 20 mol% ammonium thiocyanate doped polymer electrolyte exhibits high ionic conductivity and it has been found to be 1.7×10 -4 S cm -1, at room temperature. The ionic coordination in the polymeric electrolytes, as determined by Raman spectroscopy, has been discussed in relation to the conductance behavior.

  13. Influence of PVP/VA copolymer composition on drug-polymer solubility

    DEFF Research Database (Denmark)

    Rask, Malte Bille; Knopp, Matthias Manne; Olesen, Niels Erik

    2016-01-01

    polyvinylpyrrolidone (PVP) and polyvinyl acetate (PVA) was predicted at 25 °C using a thermal analysis method based on the recrystallization of a supersaturated amorphous dispersion (recrystallization method). These solubilities were compared with a prediction based on the solubility of CCX in the liquid monomeric...... precursors of PVP/VA, N-vinylpyrrolidone (NVP) and vinyl acetate (VA), using the Flory-Huggins lattice theory (liquid monomer solubility approach). The solubilities predicted from the liquid monomer solubility approach increased linearly with increasing VP/VA ratio from 0.03-0.60 w/w. Even though...... the solubilities predicted from the recrystallization method also increased with increasing VP/VA ratio from 0.02-0.40 w/w, the predicted solubility seemed to approach a plateau at high VP/VA ratios. Increasing positive deviations from the Gordon-Taylor equation with increasing VP/VA ratio indicated strong...

  14. PVP-coated silver nanoparticles showing antifungal improved activity against dermatophytes

    Science.gov (United States)

    Silva, Edgar; Saraiva, Sofia M.; Miguel, Sónia P.; Correia, Ilídio J.

    2014-11-01

    Fungal infections affecting human beings have increased during the last years and the currently available treatments, when administered for long periods, trigger microbial resistance. Such demands the development of new viable therapeutic alternatives. Silver is known since the antiquity by its antimicrobial properties and, herein, it was used to produce two types of nanoparticles (NPs), uncoated and coated with polyvinylpyrrolidone (PVP), which were aimed to be used in fungal infection treatment. NPs properties were characterized by Transmission electron microscopy, X-ray diffraction, UV-Vis, Dynamic light scattering, Fourier transform infrared, and Energy-dispersive X-ray spectroscopy. Furthermore, in vitro studies were also performed to evaluate NPs cytotoxic profile and antifungal activity. The results obtained revealed that the produced nanoparticles are biocompatible and have a good potential for being used in the treatment of common skin infections caused by Trichophyton rubrum and Trichophyton mentagrophytes, being PVP-coated silver NPs the most suitable ones.

  15. Design of PVP/VA S-630 based tadalafil solid dispersion to enhance the dissolution rate.

    Science.gov (United States)

    Choi, Jin-Seok; Park, Jeong-Sook

    2017-01-15

    Tadalafil (TDF) is a Biopharmaceutics Classification System (BCS) class II drug; the efficacy thereof is critically limited by inherent poor water solubility. Solid dispersion (SD) techniques are widely used to improve the bioavailability of drugs that are poorly water-soluble. Herein, we used an SD technique to improve the solubility and in vitro dissolution rate of TDF; a solvent evaporation method was applied involving the use of hydrophilic carriers (PVP/VA S-630) and assistants (malic acid or meglumine). The TDF-SD formulations were evaluated in terms of the solubility, in vitro dissolution, and stability. Physical properties were confirmed by field-emission scanning electron microscopy, differential scanning calorimetry, powder X-ray diffraction, and Fourier transform infrared spectroscopy (FT-IR). TDF-SD formulations containing assistants (malic acid or meglumine) and various solubilizers exhibited significantly enhanced solubility in distilled water (DW) (up to 27.3-fold; 18.5±0.16μg/mL with PVP/VA S-630) compared with TDF alone (0.73±0.08μg/mL). However, the dissolution rate of malic acid based formulation was decreased as the PVP/VA S-630 content increased compared to meglumine based formulation. Thus, the optimal TDF-SD formulation (TDF/meglumine/PVP/VA S-630/Aerosil 200: 1/3/5/3) exhibited a greater dissolution rate (89.1±3.9%) than TDF alone (6.2±2.5%) and Cialis(®) powder (16.0±1.9%) in DW. The final TDF-SD formulation was amorphous in nature and exhibited good stability. In conclusion, TDF-SD was successfully improved in vitro dissolution rate of TDF compared to commercial products (Cialis(®)) in the dissolution media without sodium lauryl sulfate (SLS). Copyright © 2016 Elsevier B.V. All rights reserved.

  16. Preparation, characterization and in vivo pharmacokinetic study of PVP-modified oleanolic acid liposomes.

    Science.gov (United States)

    Liu, Yan; Luo, Xiao; Xu, Xiaochao; Gao, Nannan; Liu, Xiaohong

    2017-01-30

    The primary purpose of the present study was to design and optimize a liposomal formulation of the poorly water-soluble drug oleanolic acid (OA) to improve its oral bioavailability, and prolong the duration of therapeutic drug level. Liposomes containing a soybean lecithin and cholesterol lipid bilayer, a protective hydrophilic polyvinylpyrrolidone-K30 (PVP-K30) coating, and a protective bile salt, sodium deoxycholate, were prepared by a thin-film dispersion method coupled with sonication. Several properties of the PVP-modified OA liposomes (PVPOALs), including surface morphology, particle size, zeta potential and entrapment efficiency were extensively characterized. The pharmacokinetic parameters of PVPOALs in rats were determined by UPLC-MS/MS following oral administration. The results of the characterization studies demonstrated that PVPOALs were spherical particles with an average particle size of 179.4nm and a zeta potential of -28.8mV. The drug encapsulation efficiency was more than 90%. After freeze-drying, the prepared liposomes possessed high entrapment efficiency of more than 90%. The mean particle size was 194.8nm, and the zeta potential was about -30.9mV. Furthermore, as compared to the commercial tablets, the liposomal formulation enhanced the maximum plasma concentration (Cmax) of OA by 6.90-fold in rat plasma. The relative bioavailability of PVP-modified liposomes was 607.9%. The research work in the paper suggests that PVP-modified liposomes could serve as a practical oral preparation for OA in future cancer therapy. Copyright © 2016 Elsevier B.V. All rights reserved.

  17. Production of Prednisolone by Pseudomonas oleovorans Cells Incorporated Into PVP/PEO Radiation Crosslinked Hydrogels

    Directory of Open Access Journals (Sweden)

    Abeer Abd El-Hady

    2004-01-01

    Full Text Available In order to rise the yield of prednisolone from hydrocortisone, the Pseudomonas oleovorans cells were entrapped into radiation crosslinked poly (vinyl pyrrolidone/poly(ethylene oxide (PVP/PEO hydrogel of different gel contents. The factors affecting the gel content and swelling behavior of the polymeric gel, such as polymer composition, polymer blend concentration, and irradiation doses, were investigated. The formation of gels having a good strength with the ability to retain a desirable amount of water in their three-dimensional network can be achieved by using PVP/PEO copolymer of composition (90:10 and concentration of 15% prepared at 20 kGy irradiation dose. At these conditions the prepared hydrogel is considered the most favorable one that gave the highest hydrocortisone bioconversion and prednisolone yield, 81% and 62.8%, respectively. The improvement of prednisolone yield was also achieved by increasing substrate concentration. Maximum hydrocortisone bioconversion (86.44 was obtained at 18 hours by using substrate concentration of 30 mg. Reusability of immobilized Pseudomonas oleovorans entrapped into PVP/PEO copolymer hydrogel was studied. The results indicated that the transformation capacity of hydrocortisone to prednisolone highly increased by the repeated use of copolymer for 4 times. This was accompanied by an increase in prednisolone yield to 89% and the bioconversion of hydrocortisone was 98.8%.

  18. Synthesis of antibacterial film CTS/PVP/TiO2/Ag for drinking water system.

    Science.gov (United States)

    Zhang, Liang; Bai, Xue; Tian, Hua; Zhong, Lvling; Ma, Cailian; Zhou, Yuanzhen; Chen, Shuangli; Li, Dongliang

    2012-08-01

    A CTS/PVP/TiO2/Ag functional film was prepared as an antibacterial composite used in storing drinking water. The orthogonal experiment showed that the optimal conditions for preparing membranes with best antibacterial activity and tensile strength are c(AgNO3)=0.08%, c(TiO2)=0.20%, c(CTS)=2.25%, and c(PVP)=3.00%. The FT-IR spectrum implies that hydrogen bands are formed between acetyl in PVP and hydroxyl in CTS molecule, and -NH and -OH of CTS have some interactions with sliver nano-particles (nano-Ags) which were reduced in situ. The SEM images show that the TiO2 particles are displayed on the surface and embedded in the film. And nano-Ags are further proved through XRD and SEM images. The DSC curves show that the film has a favorable compatibility and heat stability. In application study, it is proved that this film has sustainable antibacterial activity and is safe in use. Copyright © 2012 Elsevier Ltd. All rights reserved.

  19. Hydrophobic interactions increase attachment of gum Arabic- and PVP-coated Ag nanoparticles to hydrophobic surfaces.

    Science.gov (United States)

    Song, Jee Eun; Phenrat, Tanapon; Marinakos, Stella; Xiao, Yao; Liu, Jie; Wiesner, Mark R; Tilton, Robert D; Lowry, Gregory V

    2011-07-15

    A fundamental understanding of attachment of surface-coated nanoparticles (NPs) is essential to predict the distribution and potential risks of NPs in the environment. Column deposition studies were used to examine the effect of surface-coating hydrophobicity on NP attachment to collector surfaces in mixtures with varying ratios of octadecylichlorosilane (OTS)-coated (hydrophobic) glass beads and clean silica (hydrophilic) glass beads. Silver nanoparticles (AgNPs) coated with organic coatings of varying hydrophobicity, including citrate, polyvinylpyrrolidone (PVP), and gum arabic (GA), were used. The attachment efficiencies of GA and PVP AgNPs increased by 2- and 4-fold, respectively, for OTS-coated glass beads compared to clean glass beads. Citrate AgNPs showed no substantial change in attachment efficiency for hydrophobic compared to hydrophilic surfaces. The attachment efficiency of PVP-, GA-, and citrate-coated AgNPs to hydrophobic collector surfaces correlated with the relative hydrophobicity of the coatings. The differences in the observed attachment efficiencies among AgNPs could not be explained by classical DLVO, suggesting that hydrophobic interactions between AgNPs and OTS-coated glass beads were responsible for the increase in attachment of surface-coated AgNPs with greater hydrophobicity. This study indicates that the overall attachment efficiency of AgNPs will be influenced by the hydrophobicity of the NP coating and the fraction of hydrophobic surfaces in the environment.

  20. Viscoelastic behavior of mineralized (CaCO3) chitin based PVP-CMC hydrogel scaffolds

    Science.gov (United States)

    Čadež, Vida; Saha, Nabanita; Sikirić, Maja Dutour; Saha, Petr

    2017-05-01

    Enhancement of the mechanical as well as functional properties of the perspective mineralized PVP-CMC-CaCO3 hydrogel scaffold applicable for bone tissue engineering is quite essential. Therefore, the incorporation feasibility of chitin, a bioactive, antibacterial and biodegradable material, was examined in order to test its ability to enchance mechanical properties of the PVP-CMC-CaCO3 hydrogel scaffold. Chitin based PVP-CMC hydrogels were prepared and characterized both as non-mineralized and mineralized (CaCO3) form of hydrogel scaffolds. Both α-chitin (commercially bought) and β-chitin (isolated from the cuttlebone) were individually tested. It was observed that at 1% strain all hydrogel scaffolds have linear trend, with highly pronounced elastic properties in comparison to viscous ones. The complex viscosity has directly proportional behavior with negative slope against angular frequency within the range of ω = 0.1 - 100 rad.s-1. Incorporation of β-chitin increased storage modulus of all mineralized samples, making it interesting for further research.

  1. Comparative study of gum arabic and PVP as stabilizing agents for synthesis of gold nanoparticles

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Andressa A.; Leal, Jessica; Geraldes, Adriana N.; Lugao, Ademar B., E-mail: andressa_alvess@yahoo.com.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2015-07-01

    Use Colloidal metallic nanoparticles such as gold nanoparticles have received a great attention, due in part to their specific properties and potential applications. Control of size and uniformity of nanoparticles is important to prevent aggregation. High-molecular-weight polymers were used as stabilizer agents. Natural polymers, such as gum Arabic, are used as stabilizer because of capping nanoparticles behavior and present advantages such as solubility, non- toxicity and its compatibility for pharmaceutical and biomedical applications. Previous studies showed that the hydrophilic group of Poly(vinyl pyrrolidone) (PVP) caused repulsion on gold nanoparticles surface because steric interactions with polymer, for this reason this kind of polymers could be used as stabilizer agent. The aim of this work is to study the synthesis and stabilization of gold nanoparticles with PVP and gum Arabic using gamma radiation. The results obtained by samples analysis using UV-Visible showed that the gamma irradiation doses influenced the nanoparticles formation by PVP but that is not the case with the GA, because for smaller quantity of Arabic gum in different doses produced and stabilized nanoparticles. The samples were observed for 20 days and showed stability. We have obtained preliminary results showed that the use of radiation is applicable to the formation of gold nanoparticles. (author)

  2. Photo physical studies of PVP arrested ZnS quantum dots

    Science.gov (United States)

    Shahi, Ashutosh Kumar; Pandey, Bishnu Kumar; Singh, Bheeshma Pratap; Gupta, Bipin Kumar; Singh, Sukhvir; Gopal, Ram

    2017-03-01

    Monodispersed polyvinylpyrrolidone (PVP) arrested ZnS quantum dots (QDs) having diameter in range 2-5 nm are synthesized by a colloidal precipitation method using PVP as the stabilizing agent. X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selective area electron diffraction (SAED) and Fourier transform infrared (FT-IR) spectroscopy are probed to investigate the structural information. The optical properties are studied using diffuse UV-visible reflectance and photoluminescence (PL) spectroscopy techniques. TEM images as well as XRD reflection peak broadening indicate the nanometer size particles formation with cubic (sphalerite) phase within the polymer matrix. Optical absorbance studies reveal an excitonic peak at around 310 nm dictates the effect of quantum confinement effect in the ZnS QDs. PL emission spectra for ZnS QDs in PVP exhibit four emission peaks at 382 nm, 414 nm, 480 nm and 527 nm are observed. These excitonic emissions from ZnS QDs are caused by the interstitial sulfur/Zn vacancies and surface states.

  3. A comparison of PVP and methyl cellulose as rouleaux inducing reagents in the automated anti-D quantification method.

    Science.gov (United States)

    Bowell, P J; Salata, M K

    1983-01-01

    The anti-D potency of 102 samples was determined using the automated anti-D quantification method. On the whole the values obtained when using PVP as the rouleaux inducer were no different to those obtained using methyl cellulose.

  4. A procedure for disinfecting Atlantic salmon (Salmo salar) eggs using a polyvinylpyrrolidone-iodine (PVP-I) solution

    National Research Council Canada - National Science Library

    Frantsi, C; Withey, K.G

    1972-01-01

    .... The procedure involves complete disinfection of incubation facilities, hardening, measuring, picking of dead eggs, and disinfection of eggs for 10 minutes in a solution of polyvinylpyrrolidone-iodine (PVP...

  5. Solid-State Characterization and Dissolution Properties of Meloxicam–Moringa Coagulant–PVP Ternary Solid Dispersions

    OpenAIRE

    Noolkar, Suhail B.; Namdeo R Jadhav; Bhende, Santosh A.; Killedar, Suresh G.

    2013-01-01

    The effect of ternary solid dispersions of poor water-soluble NSAID meloxicam with moringa coagulant (obtained by salt extraction of moringa seeds) and polyvinylpyrrolidone on the in vitro dissolution properties has been investigated. Binary (meloxicam–moringa and meloxicam–polyvinylpyrrolidone (PVP)) and ternary (meloxicam–moringa–PVP) systems were prepared by physical kneading and ball milling and characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, a...

  6. PVP formulated Fullerene (C60) increases Rho-kinase dependent Vascular Tissue Contractility in Pregnant Sprague Dawley Rats

    Science.gov (United States)

    Vidanapathirana, Achini K.; Thompson, Leslie C.; Mann, Erin. E.; Odom, Jillian T.; Holland, Nathan A.; Sumner, Susan J.; Han, Li; Lewin, Anita H.; Fennell, Timothy R.; Brown, Jared M.; Wingard, Christopher J.

    2014-01-01

    Pregnancy is a unique physiological state, in which C60 fullerene is reported to be distributed in both maternal and fetal tissues. Tissue distribution of C60 differs between pregnant and non-pregnant states, presumably due to functional changes in vasculature during pregnancy. We hypothesized that, polyvinylpyrorrolidone (PVP) formulated C60 (C60/PVP) increases vascular tissue contractility during pregnancy by increasing Rho-kinase activity. C60/PVP was administered intravenously to pregnant and non-pregnant female Sprague Dawley rats. Vascular responses were assessed using wire myography 24 hours post-exposure. Increased stress generation was observed in uterine artery, thoracic aorta and umbilical vein. Rho-Rho-kinase mediated force maintenance was increased in arterial segments from C60/PVP exposed pregnant rats when compared to PVP exposed rats. Our findings suggest that intravenous exposure to C60/PVP during pregnancy increases vascular tissue contractility of the uterine artery through elements of Rho-Rho-kinase signaling during late stages of pregnancy. PMID:25088243

  7. Characterization and quantitation of PVP content in a silicone hydrogel contact lens produced by dual-phase polymerization processing.

    Science.gov (United States)

    Hoteling, Andrew J; Nichols, William F; Harmon, Patricia S; Conlon, Shawn M; Nuñez, Ivan M; Hoff, Joseph W; Cabarcos, Orlando M; Steffen, Robert B; Hook, Daniel J

    2017-05-15

    Polyvinylpyrrolidone (PVP) has been incorporated over the years into numerous hydrogel contact lenses as both a primary matrix component and an internal wetting agent to increase lens wettability. In this study, complementary analytical techniques were used to characterize the PVP wetting agent component of senofilcon A and samfilcon A contact lenses, both in terms of chemical composition and amount present. Photo-differential scanning calorimetry (photo-DSC), gas chromatography with a flame ionization detector (GC-FID), and high-resolution/accurate mass (HR/AM) liquid chromatography-mass spectrometry (LC-MS) techniques confirmed dual phase reaction and curing of the samfilcon A silicone hydrogel material. Gel permeation chromatography (GPC) demonstrated that high molecular weight (HMW) polymer was present in isopropanol (IPA) extracts of both lenses. High-performance liquid chromatography (HPLC) effectively separated hydrophilic PVP from the hydrophobic silicone polymers present in the extracts. Collectively, atmospheric solids analysis probe mass spectrometry (ASAP MS), Fourier transform infrared (FTIR) spectroscopy, (1) H nuclear magnetic resonance (NMR) spectroscopy, GC-FID, and LC-MS analyses of the lens extracts indicated that the majority of NVP is consumed during the second reaction phase of samfilcon A lens polymerization and exists as HMW PVP, similar to the PVP present in senofilcon A. GC-FID analysis of pyrolyzed samfilcon A and senofilcon A indicates fourfold greater PVP in samfilcon A compared with senofilcon A. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2017. © 2017 Wiley Periodicals, Inc.

  8. A novel catalyst containing palladium nanoparticles supported on PVP composite nanofiber films: Synthesis, characterization and efficient catalysis

    Science.gov (United States)

    Guo, Liping; Bai, Jie; Li, Chunping; Meng, Qingrun; Liang, Haiou; Sun, Weiyan; Li, Hongqiang; Liu, Huan

    2013-10-01

    This paper studied the preparation of Pd nanoparticles/PVP composite nanofiber membranes catalyst. In the experiment, reductant was ethanol and PVP (polyvinyl pyrrolidone) served as the protecting agent as well as supporter of palladium nanoparticles. Pd nanoparticles/PVP sol was examined by UV-vis absorbance spectra (UV-vis); Pd NPs/PVP nanofibers were characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM). The Pd NPs/PVP nanofibers films catalyst was applied to catalytic hydrogenation of aryl nitro compounds reduction and Heck reactions to test the catalytic activity, products were characterized by gas chromatograph (GC) and gas chromatograph mass spectrometer (GC-MS). Results showed that the diameters of Pd NPs were 3-10 nm and the Pd NPs/PVP nanofibers films catalyst possessed high-activity, improved the selectivity and yield, the conversion rate of paratoluidine was 74.36%, N-butyl cinnamate esters conversion rate still exceed 99% after catalyst be used three times. It overcomes the problems that palladium has leached badly and recovery difficultly in conventional homogeneous palladium catalyst field, and have a broad foreground of catalyst applications.

  9. A Novel Research on Behavior of Zinc Ferrite Nanoparticles in Different Concentration of Poly(vinyl pyrrolidone (PVP

    Directory of Open Access Journals (Sweden)

    Halimah Mohamed Kamari

    2014-04-01

    Full Text Available Zinc ferrite nanocrystals were prepared from an aqueous solution containing metal nitrates and various of concentrations of poly(vinyl pyrrolidone (PVP, i.e., 0, 15, 40, and 55 g/L, as a capping agent. To stabilize the particles, they were thermally treated at 873 K, as an optimum calcination temperature. The behaviors of the polymeric precursor were analyzed by use of simultaneous thermo-gravimetry (TG and derivative thermo-gravimetry analyses (DTG. The presence of the crystalline phase in each sample was confirmed by X-ray diffraction (XRD analysis. The average particle size and the morphology of the nanoparticles were determined by transmission electron microscopy (TEM, and these parameters were found to differ at various concentrations of PVP. Fourier transform infrared spectroscopy (FT-IR confirmed the presence of metal oxide bands for all the PVP concentrations and confirmed the absence of organic bands for PVP concentrations less than 55 g/L. Measurements of the magnetization value of the zinc ferrite nanoparticles were obtained at room temperature by using a vibrating sample magnetometer (VSM, which showed that, in the absence of PVP, the sample exhibited a paramagnetic behavior while, in the presence of PVP, samples have a super-paramagnetic behavior.

  10. Title V Operating Permits

    Science.gov (United States)

    This site will provide basic information on clean air permitting under the title V operating permits program, provide access to state and regional permitting programs, and maintain access to proposed and final regulatory requirements.

  11. Browse Title Index

    African Journals Online (AJOL)

    Issue, Title. Vol 5, No 1 (2006), Zidovudine-cyclodextrin inclusion complex and its permeability across rat stomach and intestinal compartments, Abstract. JO Onah, EO Adagazu. 101 - 101 of 101 Items, << < 1 2 3 ...

  12. Title IX Today.

    Science.gov (United States)

    Vargyas, Ellen J.

    1989-01-01

    Title IX of the Educational Amendments of 1972 is the principal federal law which prohibits sex discrimination in education. The law's requirements with regard to physical education classes and competitive, intramural, and club athletics are discussed. (IAH)

  13. Browse Title Index

    African Journals Online (AJOL)

    Items 5051 - 5100 of 11090 ... Journal Home > Advanced Search > Browse Title Index .... Vol 10, No 84 (2011), Fatty acid elongase 1 (FAE1) promoter as a candidate for genetic engineering of fatty acids to .... V Jalasutram, A Jetty, GR Anupoju.

  14. Browse Title Index

    African Journals Online (AJOL)

    Items 1 - 50 of 490 ... Journal Home > Advanced Search > Browse Title Index ... to the extraction and purification of pectin from inferior shaddock using .... Vol 4, No 4 (2008), Assessment of heavy metals concentrations in water from borehole at ...

  15. Browse Title Index

    African Journals Online (AJOL)

    Items 1 - 34 of 34 ... Journal Home > Advanced Search > Browse Title Index ... Vol 17 (2007), Application of wastewater treatment by algae in irrigation of some economic ... and physiological behavior of drinking water-borne pathogenic bacteria.

  16. Browse Title Index

    African Journals Online (AJOL)

    Items 101 - 150 of 444 ... Journal Home > Advanced Search > Browse Title Index ... Vol 60 (2007), Determination of Phenols in Water Samples using a ... Silver on Nano-ZnO for the Environmental Purification of Dye Pollutants, Abstract PDF.

  17. Energy transfer based photoluminescence properties of (Sm3+ + Eu3+):PEO + PVP polymer films for Red luminescent display device applications

    Science.gov (United States)

    Naveen Kumar, K.; Vijayalakshmi, L.; Ratnakaram, Y. C.

    2015-07-01

    Eu3+:PEO + PVP, Sm3+:PEO + PVP and co-doped Sm3+ + Eu3+:PEO + PVP polymer films have successfully been synthesized by solution casting method. For these polymer films, their XRD, FTIR and RAMAN spectral profiles were studied systematically. Both absorption and photoluminescence spectra have been assessed by evaluating their optical properties. The Sm3+:PEO + PVP and Eu3+:PEO + PVP polymer film has displayed a reddish-orange and red emissions at 596 nm and 619 nm respectively under an UV lamp. A reddish-orange emission was found for Sm3+:PEO + PVP polymer film at 596 nm (4G5/2 → 6H7/2) and its lifetime has also been evaluated suitably. Red emission at 619 nm (4G5/2 → 6H7/2) of Eu3+ has been identified for Eu3+:PEO + PVP polymer film and its lifetime are also evaluated. The photoluminescence efficiency of Eu3+ ion has been enhanced due to the addition of Sm3+ by means of an energy transfer process. The energy transfer mechanism, from Sm3+ to Eu3+ has been clearly established. At 0.1 wt% concentration of Sm3+ ions (sensitizer), the photoluminescence efficiency of the Eu3+ ion (activator) has been significantly enhanced in co-doped sample through energy transfer from Sm3+ to Eu3+ in the polymer matrix. The energy transfer process has been analyzed using lifetime decay dynamics. From the obtained results, these polymer materials could be proposed as potential Red luminescent optical materials.

  18. Neurobiology of 3,4-methylenedioxypyrovalerone (MDPV) and α-pyrrolidinovalerophenone (α-PVP).

    Science.gov (United States)

    Glennon, Richard A; Young, Richard

    2016-09-01

    Synthetic cathinones are analogs of cathinone or β-ketoamphetamine - the major psychostimulant component of the shrub Catha edulis or khat. Cathinone analogs - though not termed as such - have been known for >100 years, but confusing chemical nomenclature often made the topic difficult to appreciate. In addition, many of the early analogs were prepared as synthetic precursors for the development of various other agents, and relatively few were pharmacologically evaluated. Cathinone is a close structural relative of amphetamine. Today, certain cathinone derivatives, synthetic cathinones, are known to produce central stimulant actions and represent a "new" class of drugs of abuse. Depending upon the nature of their terminal amine, α substituent, and aryl substituents, they seem to produce their effects via release or reuptake of various neurotansmitters including dopamine norepinephreine and/or serotonin. Two of the newest and most prominent members of the class are MDPV and its parent α-PVP ("flakka"). Both have been encountered on their own and in what might be constituents of what has been termed by a variety of names including psychoactive "bath salts". Here, we describe the nomenclature of synthetic cathinones, the mechanism(s) of action of MDPV and α-PVP, and their structure-activity relationships. In order to assist in forensic studies, and to identify novel substances requiring future pharmacological evaluation, the metabolism of these agents is also described. Finally, the preclinical behavioral actions of these two agents in a variety of behavioral assays, including rodent locomotor assays, self-administration studies, intracranial self-stimulation, conditioned place preference, and drug discrimination, is summarized. The results of these studies with MDPV and α-PVP are consistent with their acting as potent cocaine-like central stimulants with abuse liability. Copyright © 2016 Elsevier Inc. All rights reserved.

  19. Effect of antigravity suit inflation on cardiovascular, PRA, and PVP responses in humans.

    Science.gov (United States)

    Kravik, S E; Keil, L C; Geelen, G; Wade, C E; Barnes, P R; Spaul, W A; Elder, C A; Greenleaf, J E

    1986-08-01

    Blood pressure, pulse rate (PR), serum osmolality and electrolytes, as well as plasma vasopressin (PVP) and plasma renin activity (PRA), were measured in five men and two women [mean age 38.6 +/- 3.9 (SE) yr] before, during, and after inflation of an antigravity suit that covered the legs and abdomen. After 24 h of fluid deprivation the subjects stood quietly for 3 h: the 1st h without inflation, the 2nd with inflation to 60 Torr, and the 3rd without inflation. A similar control noninflation experiment was conducted 10 mo after the inflation experiment using five of the seven subjects except that the suit was not inflated during the 3-h period. Mean arterial pressure increased by 14 +/- 4 (SE) Torr (P less than 0.05) with inflation and decreased by 15 +/- 5 Torr (P less than 0.05) after deflation. Pulse pressure (PP) increased by 7 +/- 2 Torr (P less than 0.05) with inflation and PR decreased by 11 +/- 5 beats/min (P less than 0.05); PP and PR returned to preinflation levels after deflation. Plasma volume decreased by 6.1 +/- 1.5% and 5.3 +/- 1.6% (P less than 0.05) during hours 1 and 3, respectively, and returned to base line during inflation. Inflation decreased PVP from 6.8 +/- 1.1 to 5.6 +/- 1.4 pg/ml (P less than 0.05) and abolished the significant rise in PRA during hour 1. Both PVP and PRA increased significantly after deflation: delta = 18.0 +/- 5.1 pg/ml and 4.34 +/- 1.71 ng angiotensin I X ml-1 X h-1, respectively. Serum osmolality and Na+ and K+ concentrations were unchanged during the 3 h of standing.(ABSTRACT TRUNCATED AT 250 WORDS)

  20. Thermodynamic aspects of polymer–surfactant interactions: Gemini (16-5-16-PVP-water system

    Directory of Open Access Journals (Sweden)

    Naved Azum

    2016-11-01

    Full Text Available The interaction between polyvinylpyrrolidone (PVP and gemini surfactant (16-5-16 in aqueous solution has been analyzed using conductometry. From conductivity data the critical aggregation concentration (cac, critical micelle concentration (cmc, the effective degree of counter-ion binding (β at different temperatures were obtained. The thermodynamic parameters, i.e., Gibbs energy of aggregation and micellization, standard enthalpy of aggregation, and standard entropy of aggregation of surfactant/polymer system were estimated, employing pseudophase separation model. The negative values of Gibbs energy and standard enthalpy suggest that the surfactant/polymer aggregation process is spontaneous and exothermic respectively.

  1. Frozen-thawed spermatozoa from oligozoospermic ejaculates are susceptible to in situ DNA fragmentation in polyvinylpyrrolidone-based sperm-immobilization medium.

    Science.gov (United States)

    Salian, Sujit Raj; Kalthur, Guruprasad; Uppangala, Shubhashree; Kumar, Pratap; Adiga, Satish Kumar

    2012-08-01

    To elucidate the effect of sperm immobilization media that are and are not based on polyvinylpyrrolidone (PVP) on the DNA integrity of fresh and frozen-thawed spermatozoa during standard intracytoplasmic sperm injection (ICSI) conditions. Experimental prospective study. Embryology research laboratory. Forty-six ejaculates from normozoospermic and oligozoospermic men. Assessment of sperm DNA fragmentation by single-cell gel electrophoresis assay. DNA integrity of fresh and frozen-thawed spermatozoa from normozoospermic and oligozoospermic ejaculates exposed to PVP-based and non-PVP-based media. Exposure of fresh and frozen thawed spermatozoa from normozoospermic and oligozoospermic ejaculates to PVP-based medium in an ICSI dish for 30 minutes statistically significantly increased the DNA fragmentation. In contrast, the extent of DNA fragmentation in non-PVP-based medium did not statistically significantly differ from control. A PVP-based medium can induce a statistically significant amount of sperm DNA fragmentation in an ICSI dish, and frozen-thawed sperm from oligozoospermic ejaculates are more susceptible to in situ DNA fragmentation. Copyright © 2012 American Society for Reproductive Medicine. Published by Elsevier Inc. All rights reserved.

  2. Formulation, Characterization, and in Vivo Evaluation of Celecoxib-PVP Solid Dispersion Nanoparticles Using Supercritical Antisolvent Process

    Directory of Open Access Journals (Sweden)

    Eun-Sol Ha

    2014-12-01

    Full Text Available The aim of this study was to develop celecoxib-polyvinylpyrrolidone (PVP solid dispersion nanoparticles with and without surfactant using the supercritical antisolvent (SAS process. The effect of different surfactants such as gelucire 44/14, poloxamer 188, poloxamer 407, Ryoto sugar ester L1695, and d-α-tocopheryl polyethylene glycol 1000 succinate (TPGS on nanoparticle formation and dissolution as well as oral absorption of celecoxib-PVP K30 solid dispersion nanoparticles was investigated. Spherical celecoxib solid dispersion nanoparticles less than 300 nm in size were successfully developed using the SAS process. Analysis by differential scanning calorimetry and powder X-ray diffraction showed that celecoxib existed in the amorphous form within the solid dispersion nanoparticles fabricated using the SAS process. The celecoxib-PVP-TPGS solid dispersion nanoparticles significantly enhanced in vitro dissolution and oral absorption of celecoxib relative to that of the unprocessed form. The area under the concentration-time curve (AUC0→24 h and peak plasma concentration (Cmax increased 4.6 and 5.7 times, respectively, with the celecoxib-PVP-TPGS formulation. In addition, in vitro dissolution efficiency was well correlated with in vivo pharmacokinetic parameters. The present study demonstrated that formulation of celecoxib-PVP-TPGS solid dispersion nanoparticles using the SAS process is a highly effective strategy for enhancing the bioavailability of poorly water-soluble celecoxib.

  3. Evolution of the PVP-Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition.

    Science.gov (United States)

    García-Aguilar, Jaime; Navlani-García, Miriam; Berenguer-Murcia, Ángel; Mori, Kohsuke; Kuwahara, Yasutaka; Yamashita, Hiromi; Cazorla-Amorós, Diego

    2016-11-22

    Palladium nanoparticles (Pd NPs) were synthesized by the reduction-by-solvent method using polyvinylpirrolidone (PVP) as capping agent. The nonstatic interaction between PVP and the metallic surface may change the properties of the NPs due to the different possible interactions, through either the O or N atoms of the PVP. In order to analyze these effects and their repercussions in their catalytic performance, Pd NPs with various PVP/Pd molar ratios (1, 10, and 20) were prepared, deposited on silica, and tested in the formic acid decomposition reaction. The catalytic tests were conducted using catalysts prepared by loading NPs with three different time lapses between their purification and their deposition on the silica support (1 day, 1 month, and 6 months). CO adsorption, FTIR spectroscopy, XPS, and TEM characterization were used to determine the accessibility of the Pd NPs surface sites, the electronic state of Pd, and the average NPs size, respectively. The H2 production from the formic acid decomposition reaction has a strong dependence on the Pd surface features, which in turn are related to the NPs aging time due to the progressive removal of the PVP.

  4. Encapsulation of plai oil/2-hydroxypropyl-β-cyclodextrin inclusion complexes in polyvinylpyrrolidone (PVP) electrospun nanofibers for topical application.

    Science.gov (United States)

    Tonglairoum, Prasopchai; Chuchote, Tudduo; Ngawhirunpat, Tanasait; Rojanarata, Theerasak; Opanasopit, Praneet

    2014-06-01

    The aim of this study was to prepare electrospun polyvinylpyrrolidone (PVP)/2-hydroxypropyl-β-cyclodextrin (HPβCD) nanofiber mats and to incorporate plai oil (Zingiber Cassumunar Roxb.). The plai oil with 10, 20 and 30% wt to polymer were incorporated in the PVP/HPβCD solution and electrospun to obtain nanofibers. The morphology and structure of the PVP and PVP/HPβCD nanofiber mats with and without the plai oil were analyzed using scanning electron microscopy (SEM). The thermal behaviors of the nanofiber mats were characterized using differential scanning calorimeter (DSC). Terpinen-4-ol was used as a marker of the plai oil. The amount of plai oil remaining in the PVP/HPβCD nanofiber mats was determined using gas chromatography-mass spectoscopy (GC-MS). The SEM images revealed that all of the fibers were smooth. The average diameter of fibers was 212-450 nm, and decreased with the increasing of plai oil content. The release characteristics of plai oil from the fiber showed the fast release followed by a sustained release over the experimental time of 24 h. The release rate ranged was in the order of 10% > 20% ∼ 30% plai oil within 24 h. Electrospun fibers with 20% plai oil loading provided the controlled release and also showed the highest plai oil content. Hence, this electrospun nanofiber has a potential for use as an alternative topical application.

  5. Structural Modification of the Designer Stimulant α-Pyrrolidinovalerophenone (α-PVP) Influences Potency at Dopamine Transporters.

    Science.gov (United States)

    Kolanos, R; Sakloth, F; Jain, A D; Partilla, J S; Baumann, M H; Glennon, R A

    2015-10-21

    α-Pyrrolidinovalerophenone (α-PVP, 7) is an illegal synthetic stimulant that is being sold on the clandestine market as "flakka" and "gravel". The potent pharmacological effects of α-PVP are presumably mediated by inhibition of dopamine uptake at the dopamine transporter (DAT). However, little is known about how structural modification of α-PVP influences activity at DAT. Eleven analogs of α-PVP were synthesized and examined for their ability to inhibit uptake of [(3)H]dopamine and [(3)H]serotonin in rat brain synaptosomes. None of the analogs significantly inhibited [(3)H]serotonin uptake when tested at 10 μM at the serotonin transporter (SERT). All of the analogs behaved as DAT reuptake inhibitors, but potencies varied over a >1500-fold range. Potency was primarily associated with the nature of the α-substituent, with the more bulky substituents imparting the highest potency. Expansion of the pyrrolidine ring to a piperidine reduced potency up to 10-fold, whereas conformational constraint in the form of an aminotetralone resulted in the least potent compound. Our study provides the first systematic and comparative structure-activity investigation on the ability of α-PVP analogs to act as inhibitors of DAT.

  6. New recreational drug 1-phenyl-2-(1-pyrrolidinyl)-1-pentanone (alpha-PVP) activates central nervous system via dopaminergic neuron.

    Science.gov (United States)

    Kaizaki, Asuka; Tanaka, Sachiko; Numazawa, Satoshi

    2014-02-01

    1-phenyl-2-(1-pyrrolidinyl)-1-pentanone (α-PVP) is a new designer drug of the cathinone type. People who have taken drugs containing α-PVP or other synthetic cathinone reportedly lose consciousness, develop difficulty breathing, and at worst case, die. However, the mechanism underlying α-PVP-induced neurotoxicity is unknown. The objective of the present study was to investigate the effect of α-PVP on the central nervous system (CNS) and compare its neurotoxicity with that of methamphetamine (METH) in mice. Balb/c male mice (8 weeks old) were orally administered α-PVP (25 mg/kg) or METH (5 mg/kg). α-PVP induced a significant increase in locomotor activity, which occurred earlier than locomotor activity induced by METH. This increase was inhibited by the D1 receptor antagonist SCH23990 (50 µg/kg, i.p.) and the D2 receptor antagonist sulpiride (50 mg/kg, i.m.). The extracellular concentration of dopamine (DA) in the striatum, determined by in vivo microdialysis increased immediately after α-PVP administration. These results suggest that α-PVP stimulates DA release, causing an increase in locomotor activity, and that this stimulatory effect of α-PVP on CNS is mediated, at least in part, by the D1 and D2 receptors.

  7. Effect of chitosan addition and gamma radiation on polymeric blends of PVP and PVAL; Efeito da adicao de quitosana e da radiacao gama em blendas polimericas de PVP e PVAL

    Energy Technology Data Exchange (ETDEWEB)

    Terence, M.C.; Castro, P.J.; Miranda, L.F.; Faldini, S.B., E-mail: mauroterence@yahoo.com.b [Universidade Presbiteriana Mackenzie, Sao Paulo. SP (Brazil). Dept. de Engenharia de Materiais

    2010-07-01

    The objective of this project is the study of the effect of chitosan addition and the radiation with gamma rays. The polymeric blend usage is a recent development that expanded the applications of the polymers, due to the improvement of the properties of a single polymer. The PVP and PVAL were chosen because they present the main required characteristics to the formation of a hydrogel, such as water absorption and crosslinking, and the chitosan to improve the interaction between the hydrogel and the organism. The flexibility of the PVP was added with the mechanical resistance of the PVAL and the chitosan biocompatibility. With a defined concentration of PVP and PVAL, films of this blend was irradiated and also solutions with different concentrations of chitosan was prepared to obtain new films of this blend. After obtaining the films, some assays were realized to evaluate the mechanical properties. (author)

  8. Biological compatibility test on films of added SEO [poly(dimethyl siloxane)-co-poly(ethylene oxide)] PVP; Teste de biocompatibilidade de filmes de PVP com adicao de SEO [poli (dimetilsiloxano)-co-poli(oxido de etileno)

    Energy Technology Data Exchange (ETDEWEB)

    Rogero, Sizue O.; Souza-Bazzi, Aurea de; Higa, Olga Z. [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil). Supervisao de Radiobiologia

    1999-11-01

    Membranes composed by polyvinylpyrrolidone (PVP), agar and water crosslinked by ionizing radiation, can have the mechanical properties improved by the addition of copolymers. Due to the hydrophilic property also by the medical grade as it is supplied, the copolymer poly(dimethyl siloxane)-co-poly(ethylene oxide) (SEO) was added to the PVP membranes. Varied concentrations of SEO were used in the preparation of PVP membranes by electron beam irradiation at dose rate of 25 kGy. For testing the bicompatibility of the SEO composed membrane the in vitro assay of cytotoxicity, with Chinese Hamster Ovary cells (CHO), was carried out. However, the membranes showed a cytotoxic characteristic in cell culture, which was stronger as the amount of SEO increased in the composition. (author) 5 refs., 1 fig., 1 tab.

  9. Organic–inorganic Au/PVP/ZnO/Si/Al semiconductor heterojunction characteristics

    Science.gov (United States)

    Mokhtari, H.; Benhaliliba, M.

    2017-11-01

    The paper reports the fabrication and characterization of a novel Au/PVP/ZnO/Si/Al semiconductor heterojunction (HJ) diode. Both inorganic n type ZnO and organic polyvinyl pyrrolidone (PVP) layers have grown by sol–gel spin-coating route at 2000 rpm. The front and back metallic contacts are thermally evaporated in a vacuum at pressure of 10-6 Torr having a diameter of 1.5 mm and a thickness of 250 nm. The detailed analysis of the forward and reverse bias current-voltage characteristics has been provided. Consequently, many electronic parameters, such as ideality factor, rectification coefficient, carrier concentration, series resistance, are then extracted. Based upon our results a non-ideal diode behavior is revealed and ideality factor exceeds the unity (n > 4). A high rectifying (~4.6 × 10 4) device is demonstrated. According to Cheung-Cheung and Norde calculation models, the barrier height and series resitance are respectively of 0.57 eV and 30 kΩ. Ohmic and space charge limited current (SCLC) conduction mechanisms are demonstrated. Such devices will find applications as solar cell, photodiode and photoconductor.

  10. Optical, electrical, thermal properties of cadmium chloride doped PVA – PVP blend

    Energy Technology Data Exchange (ETDEWEB)

    Baraker, Basavarajeshwari M.; Hammannavar, Preeti B.; Lobo, Blaise, E-mail: blaise.lobo@gmail.com [Department of Physics, Karnatak Science College, Karnatak University, Dharwad-580001 (India)

    2015-06-24

    Films of polyvinylalcohol (PVA) – polyvinylpyrrolidone (PVP) blend doped with Cadmium Chloride (CdCl{sub 2}) in the doping range 1 wt% to 40 wt% were prepared by solution casting technique. These films were characterized using optical/UV-Vis- NIR spectroscopy, Differential Scanning Calorimetry (DSC) and DC electrical measurements. The UV-Visible spectra were quantitatively analyzed to yield the optical parameters. The UV-Visible Spectra show intermediate absorption bands (before the final absorption edge) due to formation of energy bands in the forbidden gap of PVA-PVP. There is a prominent absorption band at 2.9 eV, from 0.5 wt% up to 1.8 wt% doping level (DL) caused by the dopant (CdCl{sub 2}). The DC electrical studies showed an increase in activation energy from 2.8 eV at 0.5 wt% DL up to 3.5 eV at 4.4 wt% DL, reaching a low of 2.4 eV at 11.2 wt% DL. DSC scans show evidence of formation of chain fragments, at doping levels beyond 8 wt%.

  11. PVP/PEG/Carrageenan/Silver acetate hydrogels by {gamma}-ray

    Energy Technology Data Exchange (ETDEWEB)

    Lim, Youn Mook; Youn, Young; Gwon, Hui Jeong; Park, Jong Seok; Nho, Young Chang [Korea Atomic Energy Research Institute, Jeongeup (Korea, Republic of)

    2010-03-15

    In recent day, there is much interest in the biocidal activity of silver since silver is known to be safe and effective as disinifectant and biocidal material against coliforms and viruses. In this study, hydrogels containing silver acetate as antibacterial agent have been prepared using gamma rays irradiation. The hydrogels are composed of poly(vinyl pyrrolidone) (PVP), poly(ethylene glycol) (PEG), carrageenan and silver acetate. The concentration of solution was 9 wt%. The ratio of PVP: PEG: carrageenan was 6:1:2. The concentration of the silver acetate were 0,0.01, 0.03, 0.05 and 0.07% and Gamma irradiation dose was 25 kGy. The Gamma irradiation dose in hydrogels with 0.01% silver acetate were 20 kGy, 35 kGy, 50 kGy, 65 kGy, and 80 kGy. The results showed that 0.01% silver acetate concentration of hydrogels by 25 kGy irradiation dose showed the highest antibacterial activity against E. coli and Staphylococcus aureus. Moreover, antibacterial activity of various Gamma irradiation dose in hydrogels treated 0.01% silver acetate showed highest 35 kGy irradiation dose against Staphylococcus aureus.

  12. Investigations on electrical properties of PVP:KIO4 polymer electrolyte films

    Science.gov (United States)

    Ravi, M.; Bhavani, S.; Kiran Kumar, K.; Narasimaha Rao, V. V. R.

    2013-05-01

    Solid polymer electrolytes based on poly(vinyl pyrrolidone) (PVP) complexed with potassium periodide (KIO4) salt at different weight percent ratios were prepared using solution-cast technique. X-ray diffraction (XRD) results revealed that the amorphous nature of PVP polymer matrix increased with the increase of KIO4 salt concentration. The complexation of the salt with the polymer was confirmed by Fourier transform infrared (FTIR) spectroscopy studies. The ionic conductivity was found to increase with the increase of temperature as well as dopant concentration. The maximum ionic conductivity (1.421 × 10-4 S cm-1) was obtained for 15 wt% KIO4 doped polymer electrolyte at room temperature. The variation of ac conductivity with frequency obeyed Jonscher power law. The dynamical aspects of electrical transport process in the electrolyte were analyzed using complex electrical modulus. The peaks found in the electric modulus plots have been characterized in terms of the stretched exponential parameter. Optical absorption studies were performed in the wavelength range 200-600 nm and the absorption band energies (direct band gap and indirect band gap) values were evaluated. Using these polymer electrolyte films electrochemical cells were fabricated and their discharge characteristics were studied.

  13. Evaluation of PVP/Au Nanocomposite Fibers as Heterogeneous Catalysts in Indole Synthesis

    Directory of Open Access Journals (Sweden)

    Ioanna Savva

    2016-09-01

    Full Text Available Electrospun nanocomposite fibers consisting of crosslinked polyvinylpyrrolidone (PVP chains and gold nanoparticles (Au NPs were fabricated, starting from highly stable PVP/Au NP colloidal solutions with different NP loadings, followed by thermal treatment. Information on the morphological characteristics of the fibers and of the embedded Au NPs was obtained by electron microscopy. Cylindrical, bead-free fibers were visualized by Scanning Electron Microscopy (SEM while Transmission Electron Microscopy (TEM and Energy Diffraction X-ray (EDX analysis supported the presence of Au NPs within the fibers and gave information on their morphologies and average diameters. These materials were briefly evaluated as heterogeneous catalytic supports for the gold-catalyzed intramolecular cyclisation of 2‑(phenylethynylaniline to form 2-phenyl-1H-indole. The performance of the gold catalyst was strongly dependent on the Au NP size, with the system containing the smallest Au NPs being the more effective. Moreover, a slight drop of their catalytic efficiency was observed after three consecutive reaction runs, which was attributed to morphological changes as a consequence of fiber merging.

  14. Consistency of Carbopol 971-P NF gels and influence of soluble and cross-linked PVP.

    Science.gov (United States)

    Sanz Taberner, T; Martín-Villodre, A; Pla-Delfina, J M; Herráez, José Vicente

    2002-02-21

    A study is made of the polymerization process of polyacrylic acid, commercially known as Carbopol 971 NF, assessing its consistency as a function of the degree of neutralization at pH values from 3 to 12, approximately. Percentage concentrations ranging from 0.1 to 1.4% (w/w) were studied. The gels obtained were non-Newtonian, and pseudoplastic. As concentration and pH rise, the consistency of the gels increase to a maximum, which appears between pH 6 and 8, allowing their use as vehicles in bioadhesive formulations for mucosal application. Over the increasing viscosity interval, functions were obtained to indicate the consistency of the gel as a function of pH and concentration. Since the correlation between the theoretical and experimental results is excellent, the equation found can be used to theoretically calculate the working concentration and pH required to secure the necessary consistency for a given vehicle. The addition of soluble polyvinylpyrrolidone (PVP), and cross-linked PVP (PVPP) does not substantially modify the rheological behavior of the gels, thus permitting their addition to usual vehicles.

  15. MDPV and α-PVP use in humans: The twisted sisters.

    Science.gov (United States)

    Karila, Laurent; Lafaye, Geneviève; Scocard, Amandine; Cottencin, Olivier; Benyamina, Amine

    2017-10-10

    The new psychoactive substances phenomenon continues to represent a considerable public health challenge. Synthetic cathinones are β-keto amphetamine analogues, also known as legal highs, research chemicals, bath salts. These drugs have surfaced as a popular alternative to other illicit drugs of abuse, such as cocaine, MDMA, and methamphetamine, due to their potent psychostimulant and empathogenic effects. Pyrovalerone cathinones (a-pyrrolidinophenones) form a distinct group of designer cathinones, such as MDPV. After being listed as an illegal product, "second generation" compounds such as α-PVP, sharing a very similar chemical structure with MDPV, were developed. Clinical effects of these compounds are individual, dose- and route of administration-dependent. Both of them have been involved in an increased number of, not only acute intoxications but also fatalities over the past few years, raising concerns in the medical field. In this paper, we will review the available data regarding the use and effects of MDPV and α-PVP in humans in order to highlight their impact on public health. Health actors and general population need to be clearly informed of potential risks and consequences of these 2 novel psychoactive substances spread and use. The literature search conducted led to the identification of potentially 83 relevant articles. All articles were screened from their abstracts to determine their relevance in the framework of the current review. Copyright © 2017 Elsevier Ltd. All rights reserved.

  16. Influence of morphology on the emissive properties of dye-doped PVP nanofibers produced by electrospinning

    Science.gov (United States)

    Enculescu, Monica; Evanghelidis, Alex; Enculescu, Ionut

    2014-12-01

    Dye-doped polymer micro- and nanofibers with tailored light emission properties have great potential for applications in optical, optoelectronic, or photonic devices. In this study, these types of structures were obtained by electrospinning rhodamine 6 G-doped polyvinylpyrrolidone (PVP) using a polymer solution of 10% (mass) concentration in ethanol. Polymer nanofibers with different morphologies (smooth and beaded) and diameters of about 500 nm were obtained using different electrospinning conditions with the same solutions. Fluorescence optical microscopy observations showed that the dye was distributed uniformly in the doped PVP nanofibers. Different shifts were observed when we compared the wavelength of the dye emission band peak of the smooth nanofibers (566 nm) and the wavelength of the dye emission band peak of the beaded fibers (561.5 nm) produced by electrospinning in different conditions with the wavelength of the emission band peak for transparent thin films produced by spin coating (558 nm) using the same polymer solution. This demonstrates that it is possible to tune the optical properties of electrospun dye-doped polymer nanofibers simply by modifying the morphology of the material, i.e., the parameters of the electrospinning process.

  17. Electrical Properties of PVP-SiO2-TMSPM Hybrid Thin Films as OFET Gate Dielectric

    Science.gov (United States)

    Bahari, A.; Shahbazi, M.

    2016-02-01

    Organic-inorganic polyvinylpyrrolidone-silicon dioxide-3-(trimethoxysilyl)propyl methacrylate (PVP-SiO2-TMSPM) hybrid solutions have been synthesized using the sol-gel process with different amounts of TMSPM as coupling agent and equivalent amounts of PVP and SiO2. Hybrid solutions were deposited on p-type Si(111) substrates using the spin coating technique, as a gate dielectric material for use in thin-film transistors. The structural properties of the samples were investigated using Fourier-transform infrared spectroscopy and x-ray diffraction analysis. Atomic force microscopy and scanning electron microscopy techniques were applied to study the topography and morphology of the hybrid thin-film samples. Current-voltage ( I- V) curves, capacitance-voltage ( C- V) measurements, and the electrical properties of the organic hybrid thin-film gate dielectrics were also studied in a metal-insulator/polymer-semiconductor structure. According to the results, the J GS curves in terms of V GS showed gate leakage current densities small enough for use as gate dielectric material at interface layers. At V DS = 30 V, in the saturation region, I DS curves in terms of V GS presented higher charge carrier mobility ( μ FET,S = 0.0584 cm2 s-1 V-1) due to lower dielectric constant ( k = 11.43) in the sample with 0.05 weight ratio of TMSPM compared with other samples with different weight ratios of TMSPM.

  18. Radiation preparation of drug carriers based polyacrylic acid (PAAc) using poly(vinyl pyrrolidone) (PVP) as a template polymer

    Science.gov (United States)

    Abd El-Rehim, H. A.; Hegazy, E. A.; Khalil, F. H.; Hamed, N. A.

    2007-01-01

    The present study deals with the radiation synthesis of stimuli response hydrophilic polymers from polyacrylic acid (PAAc). To maintain the property of PAAc and control the water swellibility for its application as a drug delivery system, radiation polymerization of AAc in the presence of poly(vinyl pyrrolidone) (PVP) as a template polymer was carried out. Characterization of the prepared PAA/PVP inter-polymer complex was investigated by determining gel content, swelling property, hydrogel microstructure and the release rate of caffeine as a model drug. The release rate of caffeine from the PAA/PVP inter-polymer complexes showed pH-dependency, and seemed to be mainly controlled by the dissolution rate of the complex above a p Ka of PAAc. The prepared inter-polymer complex could be used for application as drug carriers.

  19. Radiation preparation of drug carriers based polyacrylic acid (PAAc) using poly(vinyl pyrrolidone) (PVP) as a template polymer

    Energy Technology Data Exchange (ETDEWEB)

    Abd El-Rehim, H.A. [National Center for Radiation Research and Technology, Poymer, 3-Ahmed El-Zomor, P.O. Box 29, Cairo, Naser City (Egypt)]. E-mail: ha_rehim@hotmail.com; Hegazy, E.A. [National Center for Radiation Research and Technology, Poymer, 3-Ahmed El-Zomor, P.O. Box 29, Cairo, Naser City (Egypt); Khalil, F.H. [National Center for Radiation Research and Technology, Poymer, 3-Ahmed El-Zomor, P.O. Box 29, Cairo, Naser City (Egypt); Hamed, N.A. [National Center for Radiation Research and Technology, Poymer, 3-Ahmed El-Zomor, P.O. Box 29, Cairo, Naser City (Egypt)

    2007-01-15

    The present study deals with the radiation synthesis of stimuli response hydrophilic polymers from polyacrylic acid (PAAc). To maintain the property of PAAc and control the water swellibility for its application as a drug delivery system, radiation polymerization of AAc in the presence of poly(vinyl pyrrolidone) (PVP) as a template polymer was carried out. Characterization of the prepared PAA/PVP inter-polymer complex was investigated by determining gel content, swelling property, hydrogel microstructure and the release rate of caffeine as a model drug. The release rate of caffeine from the PAA/PVP inter-polymer complexes showed pH-dependency, and seemed to be mainly controlled by the dissolution rate of the complex above a pK {sub a} of PAAc. The prepared inter-polymer complex could be used for application as drug carriers.

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    Items 451 - 500 of 1932 ... Issue, Title. Vol 7, No 3 (2008), Characterization of Biotic and Abiotic Profiles of Greenhouse Evaporative Cooling System Fouling, Abstract PDF. AA Nuhu, S Ahmad. Vol 13, No 12 (2014), Characterization of Carbamazepine-Loaded Solid Lipid Nanoparticles Prepared by Rapid Expansion of ...

  20. Browse Title Index

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    Issue, Title. Vol 87, No 7 (2010), Perceptions of Interns Performance: A Comparison between a Problem Based and a Conventional Curriculum, Abstract PDF. C Owino. Vol 82, No 1 (2005):, Perceptions Of Primary Health Care With Regard To Corresponding Knowledge, Attitude And Practices Amongst The Kenyan Maasai ...

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    Items 351 - 400 of 452 ... Issue, Title. Vol 17, No 3 (2016), Prevalence of glucose-6-phosphate dehydrogenase deficiency in India: An updated meta-analysis, Abstract PDF. Pradeep Kumar, Upendra Yadav, Vandana Rai. Vol 14, No 1 (2013), Prevalence of methylenetetrahydrofolate reductase C677T and A1298C ...

  2. Browse Title Index

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    Items 101 - 150 of 350 ... Issue, Title. Vol 43 (2014), Die waarde en uitdagings van diensleer vir tolkopleiding: die ervaring van die tolkopleidingsprogram aan die Universiteit Stellenbosch, Abstract PDF. HM Lesch. Vol 45 (2014), Die waarde van tolking vir tersiêre onderrig en leer. 'n Ondersoek na die persepsies van ...

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    Items 101 - 107 of 107 ... Issue, Title. Vol 9, No 2 (2007), User Experiences And Perceptions Of Online Information Resources In Libraries: A Case Of Sokoine National Agricultural Library (Snal), Tanzania, Abstract. A Malekani. Vol 6, No 2 (2004), User fees in public libraries: perspectives, opportunities and challenges in ...

  4. Browse Title Index

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    Items 101 - 150 of 414 ... Issue, Title. Vol 8, No 1 (2011), Comparative Study on Three Major Internet Search Engines, Abstract. UA Usman, JK Alhassan. Vol 13, No 2 (2016), Competencies and materials for repositioning cataloguers for information management in an electronic era in University Libraries in South East, Nigeria ...

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    Items 501 - 550 of 741 ... Issue, Title. Vol 16, No 1 (2008), Psychosocial Factors Influencing Attitudes Towards Internet Piracy among Nigerian University Students, Abstract. F M Ilevbare. Vol 20, No 1 (2012), Psychosocial factors predisposing university undergraduates to mentoring relationship, Abstract. R Opayemi. Vol 20, No ...

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    Items 201 - 250 of 312 ... Issue, Title. Vol 23, No 1-2 (2008), Mechanism of the delayed puberty onset in offspring of rats that consumed aqueous extract of hibiscus sabdariffa during pregnancy, Abstract PDF. E.E Iyare, O.A Adegoke. Vol 24, No 2 (2009), Medicinal properties of fractionated acetone/water neem (Azadirachta ...

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    Items 51 - 100 of 292 ... Issue, Title. Vol 19, No 1 (2012), Cancer Patterns In Ilorin: An Analysis Of Ilorin Cancer Registry Statistics, Abstract. EAO Afolayan, OOK Ibrahim, GT Ayilara. Vol 17, No 1 (2010), Cardiovascular health benefits of some locally adoptable exercise techniques, Abstract. A.F Adeniyi, U.A Ahmed. Vol 19, No 2 ...

  8. Browse Title Index

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    Items 151 - 200 of 247 ... Issue, Title. Vol 3, No 4 (2008), New gaussian points for the solution of first order ordinary differential equations, Abstract PDF. J.P Chollom, S.E Madugu. Vol 10, No 1 (2015), Nuclear and Atomic Methods Applied in the Determination of Some Heavy Polluting Elements in Some Soil Samples around ...

  9. Browse Title Index

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    Items 151 - 200 of 1247 ... Issue, Title. Vol 11, No 2 (2007), Assessment of Possible Impacts of Climate Change in Water Reservoir of Bhopal with Special Reference to Heavy Metals, Central Region - India, Abstract PDF. C Parashar, S Dixit, R Shrivastava. Vol 18, No 1 (2014), Assessment of Potential Abatement provided by ...

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    Items 501 - 521 of 521 ... Issue, Title. Vol 22, No 3 (2004), Urinary tract infection in adults, Abstract PDF. E Coetzer. Vol 29, No 7 (2011), Using communication skills for difficult conversations in palliative care: 'Suffering is not a question which demands an answer, It is not a problem which demands a solution, It is a mystery ...

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    Items 401 - 450 of 493 ... Issue, Title. Vol 34, No 2 (2014), Stress and coping mechanisms of nursing students during clinical practice in Ghana, Abstract PDF. VB Bam, GA Oppong, MB Ibitoye. Vol 36, No 2 (2016), STUDENTS' AWARENESS OF AND ADHERENCE TO ENERGY MANAGEMENT PRACTICES IN SELECTED ...

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    Items 101 - 125 of 125 ... Issue, Title. Vol 4, No 2 (2014): Special Issue: Part 1, The chemist's triangle and a general systemic approach to teaching, learning and research in chemistry education, Abstract PDF. JD Bradley. Vol 4, No 2 (2014): Special Issue: Part 1, The development of a new chemistry curriculum in the ...

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    Items 551 - 600 of 611 ... Issue, Title. Vol 2, No 1 (1999), The effect of aqeous seed extract of Trigonella foenum graecum (Fenugreek) on haematological parameters in albino rats, Abstract PDF. K.D. Efraim, H.A. Salami, P.A. Nwafor. Vol 10, No 2 (2007), The effect of chronic cement dust exposure on lung function of cement ...

  14. Browse Title Index

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    Items 751 - 800 of 1463 ... Issue, Title. Vol 9, No 2 (2009): Special Issue, In-vitro antibacterial activity of selected medicinal plants from Longisa region of Bomet district, Kenya, Abstract PDF. KR Cheruiyot, D Olila, J Kateregga. Vol 7, No 4 (2007), In-vitro antimicrobial activity of selected honeys on clinical isolates of Helicobacter ...

  15. Browse Title Index

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    Issue, Title. Vol 1, No 1 (2009), Relationship Between Socioeconomic Status and Body Mass Index Among Adult Nigerians, Abstract PDF. CE Mbada, RA Adedoyin, AS Odejide. Vol 2, No 1 (2010), Relationship Between the 6-minute Walk Test and Correlates of Type 2 Diabetes: Indication for caution in exercise prescription ...

  16. Browse Title Index

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    Items 251 - 300 of 699 ... Issue, Title. Vol 33, No 3 (2008), Effects of oil pollution on aquatic macroinvertebrate assemblages in Gabon wetlands, Abstract. MR Vinson, EC Dinger, J Kotynek, M Dethier. Vol 29, No 1 (2004), Effects of the 2000 southern Mozambique floods on a marginal coral community: the case at Xai-Xai ...

  17. Browse Title Index

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    Items 101 - 150 of 11090 ... Issue, Title. Vol 12, No 7 (2013), In vitro clonal propagation of Fuchsia magellanica Lam. Abstract. Anjum Parveen, Sadia Rasheed. Vol 7, No 8 (2008), In vitro clonal propagation of Mucuna pruriens var. utilis and its evaluation of genetic stability through RAPD markers, Abstract PDF.

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    Issue, Title. Vol 11, No 3 (2017), Synthesis of novel thiazolobenzimidazoles, Abstract PDF. Siomenan Coulbali, Roger Simplice Pépin Zoakouma, Sagne Jacques Akpa, Venance Martial Say, Fanté Bamba, Drissa Sissouma, Ané Adjou. Vol 3, No 4 (2009), Synthesis of peptide derivatives of aspirin and their antibiogram ...

  19. Browse Title Index

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    Items 51 - 100 of 210 ... Issue, Title. Vol 30, No 2 (2006), Comparative Brine Shrimp Toxicity of Withenia somnifera and Chrysanthemum cinerariaefolium Extracts and In Vitro Antimicrobial Activity of W. Somnifera, Abstract. J M Mbaria, G W Gakuya, S N Yunus, H F Kaburia, A N Njuguna. Vol 27 (2004): Special Issue 2004 ...

  20. Browse Title Index

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    Items 7651 - 7700 of 11090 ... Issue, Title. Vol 11, No 6 (2012), Novel expressed sequence tag- simple sequence repeats (EST-SSR) markers characterized by new bioinformatic criteria reveal high genetic similarity in sugarcane (Saccharum spp.) breeding lines, Abstract PDF. K Ukoskit, P Thipmongkolcharoen, ...

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    Items 1 - 41 of 41 ... Issue, Title. Vol 1, No 1 (1997), Aeration of anaerobically digested sewage sludges to enhance phosphorus precipitation, Abstract. Z. Phiri, H. Harada. Vol 1, No 1 (1997), Amenability assessment for recovery of gold from Nigerian Ilesha gold ore by cyanidation, Abstract. J. A. Ajayi, S. Simukanga. Vol 1, No 2 ...

  2. Browse Title Index

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    Items 51 - 100 of 189 ... Issue, Title. Vol 5, No 2 (2004), Dimensioning of dog bone specimens and numerical analysis of the effects of different fillet radii, clamp area and pinhole loading on the stresses in such specimens, Abstract. Maina Maringa. Vol 12, No 1 (2012), Diversity of the chironomidae (diptera) of river Niger related ...

  3. Browse Title Index

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    Items 1 - 50 of 164 ... Issue, Title. Vol 22, No 1 (2010), Bona, Barometer of the Decades, Abstract. T Khuzwayo. Vol 17, No 2 (2005), En fuite, on Foot, in Thought: Making the Metropolis Elusive, Abstract. S-A Murray. Vol 15, No 1 (2003), A Brazilian theatre model meets Zulu performance conventions Westville prison – the case ...

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    Items 101 - 120 of 120 ... Issue, Title. Vol 11, No 2 (2017), Serological survey of toxoplasmosis, neosporosis and brucellosis among cattle herds in Oyo state, south-western Nigeria, Abstract PDF. Adekunle Ayinmode, Victor Akinseye, Gereon Schares, Simeon Cadmus. Vol 9, No 2 (2015), Seronegative conversion of an HIV ...

  5. Browse Title Index

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    Items 51 - 100 of 226 ... Issue, Title. Vol 17 (2000), Comparative analysis of Scandinavian and Ethiopian approaches to housing with special emphasis on housing tenure and housing finance, Abstract PDF. W Berhanu. Vol 18 (2001), Comparison Of Seismic Provisions Of EBCS 8 And Current Major Builduing Codes Pertinent ...

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    Issue, Title. Vol 3, No 3 (2009), Kinetics of the reaction of compound III of horseradish peroxidase with hydrogen peroxide and NADPH, Abstract PDF. SA Adeniyi, CL Orjiekwe, SJ Josiah. Vol 4, No 5 (2010), Knowledge of Nigerian laboratory technologists and mortuary attendants on various methods of embalming ...

  7. Browse Title Index

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    Items 51 - 100 of 139 ... Issue, Title. Vol 7, No 1 (2015), Engineering-geological properties of carbonates and shale: their implications for dam construction in Mekelle, Northern ... Vol 2, No 1 (2010), Evaluation of Orange Peel Citrus Sinensis (L) As a Source of Repellent, Toxicant and Protectant against Zabrotes Subfasciatus ...

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    Issue, Title. Vol 3, No 2 (2016), Usefulness of problem tree, objective tree and logical framework matrix to fix chal-lenges of unemployment and underemployment of higher education graduates in Rwanda, Kenya and Ghana, Abstract PDF. Irénée Ndayambaje, Philothère Ntawiha, Susan Ngigi, Samuel Yaw Ampofo.

  9. Browse Title Index

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    Items 51 - 100 of 620 ... Issue, Title. Vol 19, No 2 (2007), A qualitative study of medical student socialization in Malawi\\'s College of Medicine: Preclinical training and identity, Abstract PDF. C Wendland, C Bandawe. Vol 27, No 3 (2015), A review of patients with advanced cervical cancer presenting to palliative care services at ...

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    Items 251 - 300 of 399 ... Issue, Title. Vol 11, No 2 (2012), Pattern of diabetic retinopathy in Kano, Nigeria, Abstract PDF. A Lawan, TB Mohammed. Vol 6, No 4 (2007), Pattern of Eclampsia in a Tertiary Health Facility Situated in a Semi-Rural Town in Northern Nigeria, Abstract PDF. J Tukur, BA Umar, A Rabi'u. Vol 7, No 3 (2008) ...

  11. Browse Title Index

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    Items 351 - 400 of 465 ... Issue, Title. Vol 13, No 2 (2008), Recognition of Odontogenic Cyst-Fluid Cholesterol Concentration as a Measure of Serum Cholesterol Value of the Patient. Abstract. U Mgbeokwere, BC Ezeanolue, OC Ekwueme, AE Obiechina, C Oji. Vol 14, No 2 (2009), Recurrent angio-oedema involving the upper ...

  12. Browse Title Index

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    Items 251 - 300 of 1932 ... Issue, Title. Vol 16, No 10 (2017), Anti-hyperlipidemic effects of Caralluma edulis (Asclepiadaceae) and Verbena officinalis (Verbenaceae) whole plants against high-fat diet-induced .... Vol 8, No 4 (2009), Antimicrobial Activity of the Leaves of Endemic Stachys pseudopinardii in Turkey, Abstract PDF.

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    Items 151 - 200 of 387 ... Issue, Title. Vol 15, No 2 (2015), Introduction to Christian philosophy, Abstract. Charles Ogundu Nnaji. Vol 8, No 2 (2006), Is Quantum Mechanics a Complete Theory?: A Philosophical Defense of Einstein's Position, Abstract. U O Egbai. Vol 10, No 1 (2007), Jesus in Africa, Abstract. FF Edet. Vol 10, No ...

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    Items 401 - 450 of 814 ... Issue, Title. Vol 20, No 1 (2015), Major limb amputations at a teaching hospital in the sub-Saharan Africa: Any change in trend? Abstract PDF. OJ Ogundele, AI Ifesanya, OA Oyewole, OO Adegbehingbe. Vol 14, No 1 (2009), Major limb trauma in Eastern Ethiopia, Abstract PDF. MD Munyazewal Dessie.

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    Items 101 - 150 of 168 ... Issue, Title. Vol 59 (2017), On the record: Interview with Lieutenant General Gary Kruser, Deputy National Commissioner, South African Police Service, Abstract PDF. Johan Burger. Vol 60 (2017), On the record: Interview with Major General Johan Jooste (Retired), South African National Parks, Head of ...

  16. Browse Title Index

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    Items 101 - 150 of 338 ... Issue, Title. Vol 14, No 4 (2010), Digital teaching files – a useful teaching tool for the modern radiologist, Abstract PDF. AT du Plessis. Vol 8, No 2 (2004), Do dose area product meter measurements reflect radiation doses absorbed by health care workers? Abstract PDF. R Raubenheimer, B ...

  17. Browse Title Index

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    Items 1 - 15 of 15 ... Issue, Title. Vol 1, No 1 (2008), Assessment Of Ophthalmic Patients' Satisfaction In Owo, Abstract. CO Omolase, CO Fadamiro, BO Omolase, AS Aina, EO Omolade. Vol 3, No 1 (2010), Case Report: Strongyloides stercoralis coinfection in a Nigerian with HIV. Abstract. A.A Oyekunle, R.A.A Bolarinwa, O.A ...

  18. Browse Title Index

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    Items 1 - 50 of 900 ... Issue, Title. Vol 10, No 6 (2010), β-carotene, iron and zinc content in Papua New Guinea and East African highland bananas. Abstract PDF. R Fungo, J.K Kikafunda, M Pillay. Vol 11, No 6 (2011), Allium hookeri, Thw. Enum. A lesser known terrestrial perennial herb used as food and its ethnobotanical ...

  19. Browse Title Index

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    Items 51 - 100 of 112 ... Issue, Title. Vol 24, No 1 (2008), Improving the quality of care of the critically ill patient. Implementing the central venous line care bundle in the ICU, Abstract PDF. R Gillespie. Vol 23, No 2 (2007), Improving the quality of care of the critically ill patients: Implementing the care bundle approach in the ICU ...

  20. Browse Title Index

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    Issue, Title. Vol 50, No 1 (2013), Memory, verbal onslaught and persuasive eloquence in Armah's Two Thousand Seasons and The Healers, Abstract PDF. AM Fubara. Vol 36, No 1-2 (2002), Metacognitive reading skills in academic support: A transactionist perspective of the relationship between reading and learning ...

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    Items 251 - 300 of 333 ... Issue, Title. Vol 22, No 1 (1999), Self-incompatibility system in the Ethiopian populations of Guizotia abyssinica ( L.F) Cass. (niger). Details PDF. Sileshi Nemomissa, Endashaw Bekele, Kifle Dagne. Vol 28, No 1 (2005), Sequence stratigraphic interpretation of the Chilga basin sediments, Northwest ...

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    Issue, Title. Vol 10, No 15 (2011), The effect of polyacrylamide (PAM) applications on infiltration, runoff and soil losses under simulated rainfall conditions, Abstract PDF. Z Tümsavas, A Kara. Vol 11, No 49 (2012), The effect of polythene colour container and three spawn rates on production of Pleurotus ostreatus mushroom ...

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    Issue, Title. Vol 6, No 22 (2007), Antimicrobial activity of a decoction used by Southwestern Nigeria traditional healers on selected dermatophytes, Abstract PDF. AM Kilani, O Oyelade, OE Adeleke. Vol 7, No 16 (2008), Antimicrobial activity of autochthonous lactic acid bacteria isolated from Algerian traditional fermented milk ...

  4. Browse Title Index

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    Items 6401 - 6450 of 11090 ... Issue, Title. Vol 2, No 10 (2003), Influence of nitrogen, phosphorus and potassium application on the yield of maize in the savanna zone of Nigeria, Abstract PDF. JOS Kogbe, JA Adediran. Vol 10, No 56 (2011), Influence of nitrogen source and sucrose concentration on inulinase production by ...

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    Items 1 - 50 of 346 ... Issue, Title. Vol 27, No 3 (2014), A desire for weight loss in season increases disordered eating behaviour risk and energy deficiency in athletes, Abstract PDF. HH Wright, R Ford, CR Botha. Vol 29, No 3 (2016), A review of infant and young child feeding practice in hospital and the home in KwaZulu-Natal ...

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    Items 101 - 150 of 188 ... Issue, Title. Vol 16 (2002), Le Chichewa essai de description dans une perspective didactique, Details PDF. Allan Lipenga. Vol 3, No 1 (1989), Leibniz and Ralph Cudworth on freedom, necessity and fatalism, Abstract PDF. Didier Njirayamanda Kaphagawani. Vol 24 (2016), Les dynamiques de ...

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    Items 1 - 50 of 457 ... Issue, Title. Vol 3, No 6 (2011), 2D study of wind forces around multiple cooling towers using computational fluid dynamics, Abstract PDF. H Irtaza, S Ahmad, T Pandey. Vol 2, No 6 (2010), 3D finite element analysis on crack-tip plastic zone, Abstract PDF. Shashidhar K Kudari, Krishnaraja G Kodancha.

  8. Browse Title Index

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    Items 51 - 100 of 242 ... Issue, Title. Vol 7, No 2 (2008), Day Case Orthopaedic Surgery in a West African Teaching Hospital, Abstract. OA Adewole, SO Giwa, MO Kayode, MO Shoga. Vol 11, No 2 (2012), Diagnostic Accuracy of Lachman Test in the Evaluation of Anterior Cruciate Ligament Injuries, Abstract. CA Nkanta, JVS ...

  9. Browse Title Index

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    Items 101 - 136 of 136 ... Issue, Title. Vol 13, No 1 (2004), Taxation Of Financial Assets: Implications For Capital Market Development In Tanzania, Abstract. Emma C Isinika, Hamisi H Mwinyimvua. Vol 14, No 1 (2005), The application of management accounting techniques in decision-making in a developing country, Abstract.

  10. Browse Title Index

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    Items 51 - 100 of 333 ... Issue, Title. Vol 36, No 2 (2013), Characterization of fungal extracts from Trichoderma isolates: their effects against coffee wilt pathogen (Gibberella xylarioides), Abstract PDF. Afrasa Mulatu, Negussie Megersa, Tesfaye Alemu. Vol 35, No 2 (2012), CHROMOSOME STUDY OF SOME GRASSHOPPER ...

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    Items 101 - 150 of 814 ... Issue, Title. Vol 17, No 1 (2012), Attitude of Nurses in Mulago Hospital Burns Unit to HIV/AIDS Burns Patients, Abstract PDF. R Alenyo, R Ssentongo, E Kalanzi, C Namatovu. Vol 8, No 1 (2003), Autotransfusion in penetrating chest war trauma with haemothorax: The Keysaney Hospital experience ...

  12. Browse Title Index

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    Items 201 - 250 of 473 ... Issue, Title. Vol 1, No 2 (1999), Enhancement of protein in Cassava (in vitro), Abstract. D Eruvbetine, EB Oguntona, LO Adegbenro. Vol 5, No 1 (2002), Estimating growth, instability indices and levels of associations in number and value of loans guaranteed under agricultural credit guaranteed scheme ...

  13. Browse Title Index

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    Items 7051 - 7100 of 11090 ... Issue, Title. Vol 8, No 20 (2009), Mapping of QTLs for frost tolerance and heading time using SSR markers in bread wheat, Abstract PDF. O Sofalian, SA Mohammadi, S Aharizad, M Moghaddam, MR Shakiba. Vol 9, No 50 (2010), Mapping of QTLs for leaf area and the association with winter ...

  14. Browse Title Index

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    Items 201 - 250 of 458 ... Issue, Title. Vol 32, No 2 (2011), Grid Keratotomy for Treatment of Atypical Presenting Indolent Corneal Ulceration in a Boxer, Abstract PDF. Sarbani Hazra, Himangshu Palui. Vol 36, No 4 (2015), Gross and morphometric anatomical changes of the thyroid gland in the West African Dwarf Goat (Capra ...

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    Items 51 - 100 of 282 ... Issue, Title. Vol 17, No 1 (2016), Comparison and suitability of genotype by environment analysis methods for yield-related traits of pearl millet, Abstract PDF. G Lubadde, J Ebiyau, B Akello, M.A. Ugen. Vol 16, No 1 (2015), Comparison of in vitro digestibility using slaughtered and fistulated cattle as ...

  16. Browse Title Index

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    Items 301 - 350 of 350 ... Issue, Title. Vol 3, No 2 (2007), Socio-economic characteristics of cattle farmers and their perceptions of climatic effects on cattle production in Kwara State, Nigeria, Abstract ... Vol 6, No 3 (2010), Survey of Hard Ticks (Ixodidae) Infesting Camels (Camelus Dromedarius) in Kano State, Nigeria, Abstract.

  17. Browse Title Index

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    Items 301 - 350 of 635 ... Issue, Title. Vol 7, No 2 (2014): Supplement, Farmers' Perception and Adaptation to Climate Change: Heckman's Two Stage Sample Selection Model, Abstract PDF. U Tilahun, A Bedemo. Vol 4, No 1 (2011), Farmers' Perception and Reponses to Soil erosion in Zing Local Government Area of Taraba ...

  18. Browse Title Index

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    Items 101 - 150 of 399 ... Issue, Title. Vol 49, No 2 (2015), Determinants of physicians' intention to collect data exhaustively in registries: an exploratory study in Bamako's community health centres, Abstract PDF. BA Ly, MP Gagnon, F Legare, M Rousseau, D Simonyan. Vol 45, No 2 (2011), Diabetic foot care: Self reported ...

  19. Browse Title Index

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    Items 101 - 113 of 113 ... Issue, Title. Vol 6, No 1 (2014), The e-waste conundrum: Balancing evidence from the North and on-the-ground developing countries' realities for improved management, Abstract PDF. M Martin Oteng-Ababio, E F Amankwaa. Vol 2, No 2 (2011), The Impact of Corporate Board Meetings on Corporate ...

  20. Browse Title Index

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    Items 1 - 50 of 149 ... Issue, Title. Vol 1, No 2 (2003), A study of annexin-V labeled-lymphocytes apoptosis in pediatric-onset systemic lupus erythematosus in comparison to juvenile rheumatoid arthritis, Abstract PDF. Ashraf A Salama, Hoda Y Tomoum, Afaf A Mostafa, Emad M Mourad. Vol 10, No 2 (2012), Allergen-specific ...

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    Items 51 - 100 of 107 ... Issue, Title. Vol 3, No 1 (2005), Job satisfaction of journalism graduates in Pakistan, Abstract. S Riaz. Vol 9, No 2 (2013): Special Issue, Land Tenure Induced Deforestation and Environmental Degradation in Ethiopia: The Case of Arbagugu State Forest Development and Protection Project (A Historical ...

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    Items 101 - 137 of 137 ... Issue, Title. Vol 4, No 1 (2010), The Director as a Theatre Critic: The Case of Dapo Adelugba, Abstract PDF. N Nnenyelike. Vol 3, No 1 (2009), The drama in cross-cultural marriages and stereotypes in central Nigeria: The tiv-igede paradigm in the global age, Abstract PDF. GA Doki. Vol 10, No 2 (2016) ...

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    Items 901 - 950 of 1427 ... Issue, Title. Vol 17, No 3 (2017), Onset and duration of cycloplegic action of 1% cyclopentolate – 1% tropicamide combination, Abstract PDF. Samuel Kyei, Alfred Asiem Nketsiah, Kofi Asiedu, Agnes Awuah, Andrew Owusu-Ansah. Vol 16, No 4 (2016), Opiate withdrawal syndrome in buprenorphine ...

  4. Browse Title Index

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    Items 1 - 50 of 82 ... Issue, Title. Vol 7, No 2 (2010), A Markov deterioration model for predicting recurrent maintenance of a network of roads: a case study of Niger state, Nigeria. Abstract PDF. YA Jimoh, AY Adama. Vol 10, No 1 (2013), A Method for Solving the Voltage and Torque Equations of the Split-Phase Induction ...

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    Items 1 - 50 of 921 ... Issue, Title. Vol 9, No 1 (2005), "Abortion? That's for women!" Narratives and experiences of commercial motorbike riders in South-Western Uganda, Abstract. Stella Nyanzi, Barbara Nyanzi, Kalina Bessie. Vol 3, No 2 (1999), Editorial: Safe Abortion in Africa: Ending the Silence and Starting a Movement ...

  6. Browse Title Index

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    Items 1 - 50 of 392 ... Issue, Title .... Vol 44, No 2 (2006), Adult tonsillectomy - are long waiting lists putting patients at risk? ... G Watermeyer, MEC van Wyk, PA Goldberg ... CR de Jager, RJ Moont, NE Pearce ... testosterone and adverse prognostic factors in men diagnosed with prostate cancer in KwaZulu-Natal, Abstract PDF.

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    Issue, Title. Vol 9, No 2 (2010), Utilization of community-based outpatient addiction treatment programmes in Kenya, Abstract PDF. CS Deveau, L Tengia, C Mutua, S Njoroge, L Dajoh, B Singer. Vol 7, No 1 (2008), Volume of alcohol consumption, patterns of drinking and burden of disease in sub-Saharan Africa, 2002 ...

  8. Browse Title Index

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    Items 8251 - 8300 of 11090 ... Issue, Title. Vol 1, No 2 (2002), Physiological and molecular insights into drought tolerance, Abstract PDF. Sagadevan G Mundree, Bienyameen Baker, Shaheen Mowla, Shaun Peters, Saberi Marais, Clare Vander Willigen, Kershini Govender, Alice Maredza, Samson Muyanga, Jill M Farrant, ...

  9. Browse Title Index

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    Items 151 - 200 of 210 ... Issue, Title. Vol 13, No 2 (2016), Social determinants of self-care subsequent to major medical surgery at the Central Regional Teaching Hospital in Ghana, Abstract PDF. William Boateng. Vol 7, No 1 (2010), Socio-Economic and Cultural Determinants of Girl-Child Education in Gushegu/Karaga ...

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    Issue, Title. Vol 30, No 3 (2012), Corpus-based language teaching: An African language perspective, Abstract ... Vol 33, No 1 (2015), Development and Validation of an EFL Self-Regulated Learning Questionnaire, Abstract ... Vol 32, No 1 (2014), Domains of H tone spreading and the noun class prefix in Xitsonga, Abstract.

  11. Browse Title Index

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    Items 101 - 127 of 127 ... Issue, Title. Vol 3, No 1 (2011), Role of the African Council for Distance Education in Fostering Quality Assurance in Open and Distance Learning in Africa, Abstract. O Rotimi, J Sanusi. Vol 4, No 2 (2013), Sampling in Qualitative Research: Improving the Quality of Research Outcomes in Higher ...

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    Items 1 - 50 of 74 ... Issue, Title. Vol 4, No 1-2 (2013), 'From the classroom to stage': developing an African popular music pedagogy, Abstract PDF. AM Emielu. Vol 4, No 1-2 (2013), A review of literature: rape and communication media strategies in Nigeria, Abstract PDF. OT Akinwole, OS Omoera. Vol 2, No 1-2 (2008), A Study ...

  13. Browse Title Index

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    Items 351 - 400 of 650 ... Issue, Title. Vol 10, No 1 (2017), Inhibitory effect of isolated Lupeol from stem bark of Diospyros mespiliformis Horsch (Ebenaceae) against some microbial pathogens, Abstract PDF. A Anas, A Ahmed, S Umar, U.M. Jajere, E.H. Mshelia, O Natasha. Vol 3, No 1 (2010), Interventional studies of ...

  14. Browse Title Index

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    Items 101 - 150 of 846 ... Issue, Title. Vol 9, No 3 (2017), Assessment of nutrient contamination in surface water, case study of Ain Zada Dam (North-East of Algeria), Abstract PDF. A Mebarkia, A Haouchine, A Boudoukha, R Nedjai. Vol 5, No 2 (2013), Assessment of water quality index for groundwater of Valsad district of south ...

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    Issue, Title. Vol 38, No 1 (2004), Book Review: Unexpected Voices – Theory, Practice and Identity in the Writing Classroom. Abstract. Charly Dyers. Vol 38, No 1 (2004), Book Review: Shelley Angelil-Carter: Stolen Language? Plagiarism in Writing. Abstract. Elizabeth de Kadt. Vol 37, No 1 (2003), Book Review: The Green ...

  16. Browse Title Index

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    Items 401 - 450 of 522 ... Issue, Title. Vol 12, No 1 (2006), Spectral entropy and haemodynamic response to surgery during sevoflurane anaesthesia, Abstract PDF. FJ Smith, E Dannhauser. Vol 19, No 3 (2013), Spinal anaesthesia for brachytherapy for carcinoma of the cervix: a comparison of two dose regimens of hyperbaric ...

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    Items 1 - 50 of 231 ... Issue, Title. Vol 16, No 2 (2004), A Comparative Analysis of Students\\' Characteristics and the Impact these have on Student Unrest: The Case of Three Universities in Harare, Abstract. Muchadei Alex Nyota. Vol 24, No 3 (2012), A Comparative Analysis of the Causes of Primary School Dropout in an Urban ...

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    Items 151 - 200 of 633 ... Issue, Title. Vol 19, No 1 (2009), Delays in Tuberculosis Treatment and Associated Factors in Jimma Zone, Southwest Ethiopia, Abstract PDF. Ayalew Tegegn, Meseret Yazachew. Vol 26, No 1 (2016), Delivery Site Preferences and Associated Factors among Married Women of Child Bearing Age in ...

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    Items 151 - 168 of 168 ... Issue, Title. Vol 41 (2012), Understanding 'Poinry face': What is criminology for? Abstract PDF. B Dixon. Vol 48 (2014), Unsustainable and unjust: Criminal justice policy and remand detention since 1994, Abstract PDF. J Redpath. Vol 32 (2010), Using data to make a difference: Understanding crime ...

  20. Browse Title Index

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    Items 1 - 50 of 1006 ... Issue, Title. Vol 56, No 2 (2014), Toxoplasma gondii seroprevalence studies on humans and animals in Africa, Abstract PDF. K Hammond-Aryee, M Esser, PD Van Helden. Vol 51, No 1 (2009), A Bibliometric Analysis of Research Publications Funded Partially by the Cancer Association of South Africa ...

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    Items 101 - 150 of 1427 ... Issue, Title. Vol 10, No 3 (2010), Ameliorative effects of Cnidoscolus aconitifolius on alloxan toxicity in Wistar rats, Abstract PDF. O.I Azeez, A.A Oyagbemi, M.O Oyeyemi, A.A Odetola. Vol 12, No 4 (2012), Amlodipine-induced gingival hyperplasia in chronic renal failure: a case report, Abstract PDF.

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    Items 1 - 15 of 15 ... Issue, Title. Vol 1, No 1 (2007), An Action Five Strategy For Bridging The Gender Gap In Academic Research Activities In African Universities. The Case of Nigeria, Abstract PDF. DN Okorie, OG Agabi, CM Uche. Vol 1, No 1 (2007), Book Review: Confronting sexual harassment in Ghanaian Universities ...

  3. Browse Title Index

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    Items 451 - 500 of 518 ... Issue, Title. Vol 8, No 3 (2016): Special Issue, The effects of (ethanolic, methanolic, and aqueous) extracts of Cinnamomum zeylanicum and Thymus vulgaris with clotrimazol ointment in preventing the growth of Candidad albicans fungus, Abstract PDF. E Saffarieh, R Pazoki, S Aghaamoo, E Jahan.

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    Items 1 - 50 of 172 ... Issue, Title. Vol 35, No 3 (2006): Politics and the Imagination, 'To Think Representatively': Arendt on Judgment and the Imagination, Abstract. Maurizio Passerin d Entreves. Vol 36, No 1 (2007):, A Non-Modal Conception of Secondary Properties, Abstract. Manuel García-Carpintero. Vol 30, No 3 (2001): ...

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    Items 551 - 600 of 911 ... Issue, Title. Vol 16, No 1 (2012), Nigerian Lawyers and Reproductive Health Rights: A Survey of Knowledge, Practices and Opinions on Law Reforms among the Bar and Bench in North Eastern Nigeria, Abstract PDF. Abdulkarim Garba Mairiga, Ado Dan'azumi Geidam, Babagana Bako, Abdullahi ...

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    Items 51 - 100 of 247 ... Issue, Title. Vol 9, No 1 (2014), Biochemical response of normal albino rats to the addition of aqueous leaves extract of Hibiscus cannabinus and Murraya koenigii in rats drinking water, Abstract PDF. SA James, MJ Ladan, R Auta, J Audu, A Garba. Vol 4, No 1 (2009), Bioconversion of cassava starch to ...

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    Items 301 - 350 of 425 ... Issue, Title. Vol 36 (2005), Nutrient status of some soils supporting rubber (Hevea brasil iensis Arg. Muell) in Midwestern Nigeria, Abstract. IK Ugwa, Jr Orimoloye, TU Esekhade. Vol 35 (2004), Nutritional physcio-chemical properties of snake gourd Trichosanthes cucumerina pulp compared to tomatoe ...

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    Items 251 - 300 of 641 ... Issue, Title. Vol 3, No 4 (2013), Fetal Macrosomia: Risk Factors, Maternal, and Perinatal Outcome, Abstract PDF. A Mohammadbeigi, F Farhadifar, N Soufi Zadeh, N Mohammadsalehi, M Rezaiee, M Aghaei. Vol 3, No 3 (2013), Fever of Unknown Origin: A Case of Post Obstructive Pneumonia ...

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    Items 301 - 350 of 391 ... Issue, Title. Vol 1, No 3 (1999):, Selection and in-vitro propagation of five cassava (Manihot esculenta, Crantz) cultivars, Abstract. K. E. Danso, E. Acheampong, H. M. Amoatey. Vol 12, No 1 (2010), Selection of New Standard Crosses for the Oil Palm (Elaeis Guineensis J.) Third Cycle of Selection ...

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    Items 1 - 50 of 425 ... Issue, Title. Vol 34 (2003), A COMPARATIVE ANALYSIS OF CAPTURE FISHERIES ON THE WESTERN AND EASTERN SHORES OF KAINJI LAKE BASIN, NIGERIA, Abstract. M.A.Y RAHJI. Vol 40, No 1-2 (2009), A comparative study of gender roles in indigenous processing and marketing of yam and ...

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    Items 251 - 260 of 260 ... Issue, Title. Vol 46 (2006), The use of two biological formulations of Bacillus Thuringiensis and Bacillus Sphaericus in the control of mosquito vectors of malaria in drains and rice fields, Abstract. M H Ocran, F Akpabey. Vol 47 (2007), The Wildlife Trade In Ghana: A Threat To Biodiversity Conservation ...

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    Items 51 - 100 of 452 ... Issue, Title. Vol 16, No 1 (2015), Association of β-fibrinogen promoter gene polymorphism (148C/T), hyperfibrinogenemia and ischemic stroke in young adult patients, Abstract PDF. I Imran, R Lamsudin, P Idjradinata, TH Achmad, A Maskoen, S Wibowo, H Harapan. Vol 17, No 1 (2016), Association of ...

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    Issue, Title. Vol 23, No 1 (2016), La teneur en iode du sel de cuisine consommé à Lubumbashi et le statut iode des personnes vulnérables: cas de femmes enceintes de milieux défavorisés, Abstract. Bienvenue Ilunga Banza, Jean Baptiste Simbi Lumbu, Philippe Donnen, Eugène Kabange Twite, Daniel Mikobi Kwete, ...

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    Items 1 - 37 of 37 ... Issue, Title. Vol 12, No 1 (2006), A critical analysis of paradigms and rights in disability dicources, Abstract. L Nyirinkindi. Vol 12, No 2 (2006), A Critique Of The Rights Of Refugees Under The OAU Convention Governing The Specific Aspects Of Refugee Problems In Africa, Abstract. OS Oyelade. Vol 14, No ...

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    Items 1 - 50 of 247 ... Issue, Title. Vol 6, No 2 (2011), In vitro Aantimalarial Activity of the Extracts of Vernonia amygdalina Commonly Used In Traditional Medicine In Nigeria, Abstract PDF. KK Sha'a, S Oguche, IM Watila, TF Ikpa. Vol 12, No 1 (2017), In vitro antioxidant activity of n-butanol extract of Curcuma longa and its ...

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    Items 301 - 350 of 432 ... Issue, Title. Vol 21, No 1 (2016), Selection criteria for a radiography programme in South Africa: Predictors for academic success in the first year of study, Abstract PDF. Carol Anne Kridiotis, Johan Bezuidenhout, Jacques Raubenheimer. Vol 10, No 4 (2005), Service-learning in nursing: Integrating ...

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    Items 1 - 50 of 85 ... Issue, Title. Vol 4, No 1 (2012), Helicobacter Pylori: Serological Testing and Treatment in Uninvestigated Dyspepsia: Randomized Control Study in Northern Nigeria, Abstract. OA Solomon, TD Thacher, AO Ajayi. Vol 8, No 2 (2016), Helicobacter pylori and upper digestive diseases - diagnosis through real ...

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    Issue, Title. Vol 33, No 3 (2011), Transit station or destination? Attendance patterns, movements and abundance estimate of humpback whales off west South Africa from photographic and genotypic matching, Abstract. J Barendse, PB Best, M Thornton, SH Elwen, HC Rosenbaum, I Carvalho, C Pomilla, TJQ Collins, MA ...

  19. Browse Title Index

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    Items 1 - 50 of 113 ... Issue, Title. Vol 8, No 2 (2016), 2010 FIFA World Cup stadium investment: Does the post-event usage justify the expenditure? Abstract. Luke Humphrey, Gavin Fraser. Vol 6, No 1 (2014), 7Implication of mergers and acquisitions on stock returns before and during the 2007–2009 credit crunch: An event ...

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    Items 351 - 400 of 1199 ... Issue, Title. Vol 5, No 1 (2011), Effective Classroom Management Techniques for Secondary Schools, Abstract PDF. RI Asiyai. Vol 9, No 2 (2015), Effective Management of Human Resources for Business and Church Growth, Abstract PDF. SA Jaja, LO Arugu. Vol 6, No 3 (2012), Effective Management ...

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    Items 101 - 150 of 227 ... Journal Home > Advanced Search > Browse Title Index ... Vol 7, No 1 (2015): Supplement 1, Impact of a quality improvement project to strengthen infection prevention and control training at rural healthcare facilities ... Vol 2, No 1 (2010), Is temperament a key to the success of teaching innovation?

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    Items 51 - 97 of 97 ... Issue, Title. Vol 4, No 3 (2015), Malaria and intestinal parasites in pregnant and non-pregnant women: a comparative study at the University Hospital, Kumasi, Ghana, Abstract PDF. E. Agboli, S.C.K. Tay, C. Obirikorang, E.Y. Aidoo. Vol 1, No 4 (2012), Management of complex ankle fracture: A Ghanaian ...

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    Issue, Title. Vol 74 (2014), Isolation, characterization and primary screening of soil actinomycetes from Kenyatta University arboretum grounds for antibacterial activities, Abstract PDF. OY Khasabuli, AN Kibera. Vol 114 (2017), Isolement par partition bio guidé du principe actif myostimulant de l'extrait aqueux de Mareya ...

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    Items 151 - 200 of 244 ... Issue, Title. Vol 22, No 1-4 (2010), Ocular features seen in children with hydrocephalus at University of Nigeria Teaching Hospital Enugu: a case series, Abstract. FC Maduka-Okafor, UF Ezepue. Vol 25, No 3-4 (2013), Ocular manifestations and outcome of treatment of Stevens-Johnson Syndrome: ...

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    Issue, Title. Vol 21, No 1 (2015), Lingual botryomycoma in the aftermath of Stevens-Johnson syndrome, Abstract PDF. Houyam Moundib, Fouzia Hali. Vol 17, No 1 (2014), Lipid profile frequency and the prevalence of dyslipidaemia from biochemical tests at Saint Louis University Hospital in Senegal, Abstract PDF.

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    Issue, Title. Vol 3, No 1 (2014), Utilisation and diagnostic yield of large bowel endoscopy at Korle-Bu Teaching Hospital, Abstract PDF. JCB Dakubo, B Seshie, LNA Ankrah. Vol 2, No 2 (2013), Visual Impairment and Ocular Findings among Deaf and Hearing Impaired School Children in Central Region, Ghana, Abstract PDF.

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    Items 51 - 100 of 1117 ... Issue, Title. Vol 21, No 2 (2015), A cross-over from Sport Psychology to the Psychology of Music: An intervention study on undergraduate music students, Abstract. BJM Steyn, MH Steyn, DJF Maree, C Panebianco-Warrens. Vol 16, No 2 (2010), A descriptive and factor analytical study of salient ...

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    Items 1 - 50 of 116 ... Issue, Title. Vol 25 (2005), 'Stop this filth': The censorship of Roger Lucey's music in apartheid South Africa, Abstract. M Drewett ... Vol 26 (2007), 'This Is Our Sport!' Christmas Band ... Vol 34-35, No 1 (2015), Book Review: Sounding the Cape: Music, Identity and Politics in South Africa, Abstract. Francesca ...

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    Items 101 - 150 of 493 ... Issue, Title. Vol 30, No 1 (2010), Determinants of Under-Five Mortality in Builsa District, Upper East Region, Ghana, Abstract PDF. K Osei-Kwakye, E Otupiri, E Owusu Dabo, ENL Browne, M Adjuik. Vol 29, No 2 (2009), Determination Of Segmented Angular Shapes For Circular Areas Of Thermal ...

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    Items 1 - 50 of 521 ... Journal Home > Advanced Search > Browse Title Index ... Vol 22, No 8 (2004), A medical approach to language delay, Abstract PDF ... Vol 29, No 3 (2011), Advanced magnetic resonance imaging of the brain: MRI is now the ...

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    Items 201 - 250 of 432 ... Issue, Title. Vol 21, No 1 (2016), Knowledge, perceptions and practices of pharmacovigilance amongst community and hospital pharmacists in a selected district of North West Province, South Africa, Abstract PDF. M.C. Joubert, Panjasaram Naidoo. Vol 9, No 2 (2004), Leadership in Health Services ...

  12. Browse Title Index

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    Items 1 - 50 of 990 ... Issue, Title. Vol 11, No 1 (1997), (+)-Floribundone 3 from the pods of Senna septemtrionalis, Details PDF. Gizachew Alemayehu, Bekuretsion Woldeyesus, Berhanu M Abegaz. Vol 14, No 1 (2000), 11α-Hydroxy muzigadiolide, a novel drimane sesquiterpene from the stem bark of warburgia ugandensis ...

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    Issue, Title. Vol 38, No 1 (2016), Changes in insulin resistance and adipokines in obese women following a 12-week programme of combined exercise training, Abstract. Dong-Il Seo, Wi-Young So, Dong Jun Sung. Vol 36, No 2 (2014), Changing relationships with significant others: Reflections of National and International ...

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    ... current susceptibility pattern of methicillin resistant Staphylococcus aureus to ... The effect of heat treatment on the chemical composition of canned meat. ... on muscle texture and eating qualities of the broiler chickens for Nigerians, Abstract.

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    ) and Berillium iodide (BeI2) thin films and their possible applications, Abstract PDF. P A Ilenikhena. Vol 30, No 3 (2010), Compensatory and susceptive responses of cowpea genotypes to infestation by aphis Craccivora ...

  16. Protein adsorption resistance of PVP-modified polyurethane film prepared by surface-initiated atom transfer radical polymerization

    Energy Technology Data Exchange (ETDEWEB)

    Yuan, Huihui; Qian, Bin; Zhang, Wei [Shanghai Key Laboratory of Functional Materials Chemistry and Research Center of Analysis and Test, East China University of Science and Technology, Shanghai 200237 (China); Lan, Minbo, E-mail: minbolan@ecust.edu.cn [Shanghai Key Laboratory of Functional Materials Chemistry and Research Center of Analysis and Test, East China University of Science and Technology, Shanghai 200237 (China); State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237 (China)

    2016-02-15

    Highlights: • Antifouling PVP brushes were successfully grafted on PU films by SI-ATRP. • The effect of polymerization time on surface property and topography was studied. • Hydrophilicity and protein fouling resistance of PVP–PU films were greatly promoted. • Competitive adsorption of three proteins on PVP–PU films was evaluated. - Abstract: An anti-fouling surface of polyurethane (PU) film grafted with Poly(N-vinylpyrrolidone) (PVP) was prepared through surface-initiated atom transfer radical polymerization (SI-ATRP). And the polymerization time was investigated to obtain PU films with PVP brushes of different lengths. The surface properties and protein adsorption of modified PU films were evaluated. The results showed that the hydrophilicity of PU–PVP films were improved with the increase of polymerization time, which was not positive correlation with the surface roughness due to the brush structure. Additionally, the protein resistance performance was promoted when prolonging the polymerization time. The best antifouling PU–PVP (6.0 h) film reduced the adsoption level of bovine serum albumin (BSA), lysozyme (LYS), and brovin serum fibrinogen (BFG) by 93.4%, 68.3%, 85.6%, respectively, compared to the unmodified PU film. The competitive adsorption of three proteins indicated that LYS preferentially adsorbed on the modified PU film, while BFG had the lowest adsorption selectivity. And the amount of BFG on PU–PVP (6.0 h) film reduced greatly to 0.08 μg/cm{sup 2}, which was almost one-tenth of its adsorption from the single-protein system. Presented results suggested that both hydrophilicity and surface roughness might be the important factors in all cases of protein adsorption, and the competitive or selective adsorption might be related to the size of the proteins, especially on the non-charged films.

  17. Physicochemical properties of direct compression tablets with spray dried and ball milled solid dispersions of tadalafil in PVP-VA.

    Science.gov (United States)

    Wlodarski, K; Tajber, L; Sawicki, W

    2016-12-01

    The aim of this research was to develop immediate release tablets comprising solid dispersion (IRSDTs) of tadalafil (Td) in a vinylpyrrolidone and vinyl acetate block copolymer (PVP-VA), characterized by improved dissolution profiles. The solid dispersion of Td in PVP-VA (Td/PVP-VA) in a weight ratio of 1:1 (w/w) was prepared using two different processes i.e. spray drying and ball milling. While the former process has been well established in the formulation of IRSDTs the latter has not been exploited in these systems yet. Regardless of the preparation method, both Td/PVP-VA solid dispersions were amorphous as confirmed by PXRD, DSC and FTIR. However, different morphology of particles (SEM) resulted in differences in water apparent solubility and disk intrinsic dissolution rate (DIDR). Both solid dispersions and crystalline Td were successfully made into directly compressible tablets at three doses of Td, i.e. 2.5mg, 10mgand20mg, yielding nine different formulations (D1-D9). Each of the lots met the requirements set by Ph.Eur. and was evaluated with respect to appearance, diameter, thickness, mass, hardness, friability, disintegration time and content of Td. IRSDTs performed as supersaturable formulations and had significantly improved water dissolution profiles in comparison with equivalent tablets containing crystalline Td and the marketed formulations. Tablets with both spray dried and ball milled Td/PVP-VA revealed the greatest improvement in dissolution depending on the investigated doses, i.e. 2.5mgand20mg, respectively. Also, dissolution of Td from Td/PVP-VA delivered in different forms occurred in the following order: powders>tablets>capsules. Copyright © 2016 Elsevier B.V. All rights reserved.

  18. Improvement in latent fingerprint detection on thermal paper using a one-step ninhydrin treatment with polyvinylpyrrolidones (PVP).

    Science.gov (United States)

    Schwarz, Lothar; Klenke, Inga

    2010-07-01

    Most thermosensitive surfaces of thermal paper turn black when they come into contact with polar organic solvents such as are used in ninhydrin petroleum benzin solution. This dark staining reduces the contrast between the developed fingerprint and the background to such an extent that the identification process becomes very difficult. Integrating polyvinylpyrrolidones (PVP) into a ninhydrin solution prevents the black staining, and the developed fingerprints appear in clear contrast to the background. The new ninhydrin solution containing PVP is successful compared to the two-step ninhydrin-acetone washing method for thermal paper which is popular in Germany.

  19. Influence of PVP/VA copolymer composition on drug-polymer solubility.

    Science.gov (United States)

    Rask, Malte Bille; Knopp, Matthias Manne; Olesen, Niels Erik; Holm, René; Rades, Thomas

    2016-03-31

    In this study, the influence of copolymer composition on drug-polymer solubility was investigated. The solubility of the model drug celecoxib (CCX) in various polyvinylpyrrolidone/vinyl acetate (PVP/VA) copolymer compositions (70/30, 60/40, 50/50 and 30/70 w/w) and the pure homopolymers polyvinylpyrrolidone (PVP) and polyvinyl acetate (PVA) was predicted at 25 °C using a thermal analysis method based on the recrystallization of a supersaturated amorphous dispersion (recrystallization method). These solubilities were compared with a prediction based on the solubility of CCX in the liquid monomeric precursors of PVP/VA, N-vinylpyrrolidone (NVP) and vinyl acetate (VA), using the Flory-Huggins lattice theory (liquid monomer solubility approach). The solubilities predicted from the liquid monomer solubility approach increased linearly with increasing VP/VA ratio from 0.03-0.60 w/w. Even though the solubilities predicted from the recrystallization method also increased with increasing VP/VA ratio from 0.02-0.40 w/w, the predicted solubility seemed to approach a plateau at high VP/VA ratios. Increasing positive deviations from the Gordon-Taylor equation with increasing VP/VA ratio indicated strong interactions between CCX and the VP repeat unit, which was in accordance with the relatively high solubilities predicted using both methods. As the solubility plateau may be a consequence of steric hindrance caused by the size differences between CCX and the VP repeat units, it is likely that a CCX molecule interacting with a VP repeat unit hinders another CCX molecule from binding to the neighboring repeat units in the polymer chain. Therefore, it is possible that replacing these neighboring hygroscopic VP repeat units with hydrophobic VA repeat units, could increase the physical stability of an amorphous solid dispersion without compromising the drug-polymer solubility. This knowledge could be used advantageously in future development of amorphous drug delivery systems as

  20. Influence of polymer molecular weight on in vitro dissolution behavior and in vivo performance of celecoxib:PVP amorphous solid dispersions

    DEFF Research Database (Denmark)

    Knopp, Matthias Manne; Nguyen, Julia Hoang; Becker, Christian

    2016-01-01

    In this study, the influence of the molecular weight of polyvinylpyrrolidone (PVP) on the non-sink in vitro dissolution and in vivo performance of celecoxib (CCX):PVP amorphous solid dispersions were investigated. The dissolution rate of CCX from the amorphous solid dispersions increased with dec...

  1. Browse Title Index

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    Issue, Title. Vol 5, No 3 (2011), Caractérisation de souches d'Aspergillus spp isolées des graines d'arachides cultivées au Burkina Faso, Afrique de l'Ouest, Abstract PDF .... Vol 1, No 2 (2007), Caractérisation et étude de la germination des diaspores de Tetracarpidium conophorum (Müll. Arg.) Hutch. et Dalz. Abstract PDF.

  2. Browse Title Index

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    Items 1 - 50 of 513 ... Issue, Title. Vol 38, No 2 (2017), -308G>A (rs1800629)and -244G>A(rs673) polymorphisms at the promoter region of the TNF-α gene in severe malaria patients in north-central Nigeria, Abstract. S.I. Oyedeji, H.O. Awobode, P.U. Bassi, F.K. Jürgen. Vol 36, No 1 (2015), Albicans candidiasis amongs women ...

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    Items 201 - 250 of 683 ... Issue, Title. Vol 86, No 3 (2015), Current conservation status of the Blue Swallow Hirundo atrocaerulea Sundevall 1850 in Africa, Abstract. S.W. Evans, A Monadjem, L Roxburgh, A.E. McKechnie, E.M. Baker, R.B. Kizungu, I.T. Little, F Matsvimbo, R.K. Mulwa, D Mwizabi, D Nalwanga, K Ndang'ang'a, ...

  4. High-Yield Synthesis of Uniform Ag Nanowires with High Aspect Ratios by Introducing the Long-Chain PVP in an Improved Polyol Process

    Directory of Open Access Journals (Sweden)

    Jie-Jun Zhu

    2011-01-01

    Full Text Available Polyvinyl pyrrolidone (PVP with different molecular weights was used as capping agent to synthesize silver nanowires through a polyol process. The results indicated that the yields and aspect ratios of silver nanowires were controlled by the chain length of PVP and increased with increasing the molecular weight (MW of PVP. When the long-chain PVP-K90 (MW = 800,000 was used, the product was uniform in size and was dominated by nanowires with high aspect ratios. The growth mechanism of the nanowires was studied. It is proposed that the chemical adsorption of Ag+ on the PVP chains at the initial stage promotes the growth of Ag nanowires.

  5. Poor title--poor manuscript?

    Science.gov (United States)

    Gjersvik, Petter; Gulbrandsen, Pål; Aasheim, Erlend T; Nylenna, Magne

    2013-12-10

    The title of a scientific article is important for several reasons. Does the title of a manuscript submitted for publication in a medical journal reflect the quality of the manuscript itself? We prepared criteria for poor, fair and good titles and tested them in pilot studies. All manuscripts submitted to the Journal of the Norwegian Medical Association during the period 1 September 2009-31 August 2011 as original articles (n = 211) or review articles (n = 110) were recorded. The quality of the titles was scored by two former editors. Primary outcome measures were rejection rates and odds ratio for rejection of manuscripts with a poor title compared to those with a good title. For original articles, the rejection rate for manuscripts with a poor, fair or good title amounted to 88%, 73% and 61% (p = 0.002) respectively, and for review articles 83%, 56% and 38% (p title compared to those with a good title was 4.6 (95% CI: 1.7-12.3) for original articles and 8.2 (95% CI: 2.6-26.4) for review articles. In a logistic regression model, the quality of the title explained 14% and 27% of the variance in outcome for original articles and review articles respectively. In this study, a poor manuscript title was significantly associated with manuscript rejection. This indicates that the quality of the title often reflects the quality of the manuscript itself.

  6. Effect of strain on viscoelastic behavior of fresh, swelled and mineralized PVP-CMC hydrogel

    Science.gov (United States)

    Saha, Nabanita; Vyroubal, Radek; Shah, Rushita; Kitano, Takeshi; Saha, Petr

    2013-04-01

    Mineralization of calcium carbonate (CaCO3) in hydrogel matrix is one of the most interesting topics of research by material scientists for the development of bio-inspired polymeric biomaterial for biomedical applications especially for bone tissue regeneration. As per our knowledge there was no work reported about rheological properties of CaCO3 mineralized hydrogel though some works have done on mineralization of CaCO3 in various gel membranes, and also it was reported about the viscoelastic properties of Agarose, Cellulose, PVA and PVPCMC hydrogels. This paper mainly focuses about the effect of strain on viscoelastic properties of fresh, swelled and mineralized (CaCO3) PVP-CMC hydrogel. All these three types of hydrogel sustain (or keep) strictly the elastic properties when low strain (1%) is applied, but at higher strain (10%) the viscoelastic moduli (G' and G") show significant change, and the nature of these materials turned from elastic to viscous.

  7. Synthesis of PVA/PVP hydrogels having two-layer by radiation and their physical properties

    Science.gov (United States)

    Park, Kyoung Ran; Nho, Young Chang

    2003-06-01

    In these studies, two-layer hydrogels which consisted of polyurethane membrane and a mixture of polyvinyl alcohol(PVA)/poly- N-vinylpyrrolidone(PVP)/glycerin/chitosan were made for the wound dressing. Polyurethane was dissolved in solvent, the polyurethane solution was poured on the mould, and then dried to make the thin membrane. Hydrophilic polymer solutions were poured on the polyurethane membranes, they were exposed to gamma irradiation or two steps of 'freezing and thawing' and gamma irradiation doses to make the hydrogels. The physical properties such as gelation, water absorptivity, and gel strength were examined to evaluate the hydrogels for wound dressing. The physical properties of hydrogels such as gelation and gel strength was greatly improved when polyurethane membrane was used as a covering layer of hydrogel, and the evaporation speed of water in hydrogel was reduced.

  8. Synthesis and characterization of PVP-functionalized superparamagnetic Fe3O4 nanoparticles as an MRI contrast agent

    Directory of Open Access Journals (Sweden)

    2010-06-01

    Full Text Available The magnetite (Fe3O4 nanoparticles (MNPs coated with poly(N-vinyl pyrrolidone (PVP via covalent bonds were prepared as T2 contrast agent for magnetic resonance imaging (MRI. The surface of MNPs was first coated with 3-(trimethoxysilyl propyl methacrylate (silan A by a silanization reaction to introduce reactive vinyl groups onto the surface, then poly(N-vinyl pyrrolidone was grafted onto the surface of modified-MNPs via surface-initiated radical polymerization. The obtained nanoparticles were characterized by FT-IR (Fourier transform infrared spectroscopy, XRD (X-ray diffraction, TEM (transmission electron microscopy, VSM (vibrating sample magnetometer, and TGA (thermogravimetric analysis. The MNPs had an average size of 14 nm and exhibited superparamagnetism and high saturation magnetization at room temperature. T2-weighted MRI images of PVP-grafted MNPs showed that the magnetic resonance signal is enhanced significantly with increasing nanoparticle concentration in water. The r1 and r2 values per millimole Fe, and r2/r1 value of the PVP-grafted MNPs were calculated to be 2.6 , 72.1, and 28.1(mmol/l–1•s–1, respectively. These results indicate that the PVP-grafted MNPs have great potential for application in MRI as a T2 contrast agent.

  9. Resistive switching effect of N-doped MoS2-PVP nanocomposites films for nonvolatile memory devices

    Science.gov (United States)

    Wu, Zijin; Wang, Tongtong; Sun, Changqi; Liu, Peitao; Xia, Baorui; Zhang, Jingyan; Liu, Yonggang; Gao, Daqiang

    2017-12-01

    Resistive memory technology is very promising in the field of semiconductor memory devices. According to Liu et al, MoS2-PVP nanocomposite can be used as an active layer material for resistive memory devices due to its bipolar resistive switching behavior. Recent studies have also indicated that the doping of N element can reduce the band gap of MoS2 nanosheets, which is conducive to improving the conductivity of the material. Therefore, in this paper, we prepared N-doped MoS2 nanosheets and then fabricated N-doped MoS2-PVP nanocomposite films by spin coating. Finally, the resistive memory [C. Tan et al., Chem. Soc. Rev. 44, 2615 (2015)], device with ITO/N-doped MoS2-PVP/Pt structure was fabricated. Study on the I-V characteristics shows that the device has excellent resistance switching effect. It is worth mentioning that our device possesses a threshold voltage of 0.75 V, which is much better than 3.5 V reported previously for the undoped counterparts. The above research shows that N-doped MoS2-PVP nanocomposite films can be used as the active layer of resistive switching memory devices, and will make the devices have better performance.

  10. Browse Title Index

    African Journals Online (AJOL)

    Items 551 - 600 of 2005 ... East African Medical Journal. ... Vol 91, No 11 (2014), Disaster preparedness in secondary schools in Ruiru Division, Kiambu County, Kenya, Abstract ... Vol 82, No 12 (2005):, Drug susceptibility pattern of Helicobacter pylori in patients with dyspepsia at the Kenyatta National Hospital, Nairobi ...

  11. Browse Title Index

    African Journals Online (AJOL)

    Items 1 - 45 of 45 ... Vol 6 (2004), Effect of ph and nutrient starvation on biodegradation of azo dyes by Cellulomonas sp. Abstract. N A Oranusi, C J Ogugbue. Vol 6 (2004), Falciparum malaria and their susceptibility to genetic markers among pregnant women in Uyo, South Eastern Nigeria, Abstract. K N Opara, E S Ibanga, N B ...

  12. Browse Title Index

    African Journals Online (AJOL)

    Vol 8, No 2 (2014), Prevalence of Salmonella and their antibiotic susceptibility patterns in the District of Abidjan, Côte d'Ivoire, Abstract PDF. AC Bonny, ATG Karou, ... Vol 8, No 5 (2014), Prevalence of intestinal protozoan parasites in stray and domicile dogs in Ilorin, North Central, Nigeria, Abstract PDF. A Adedoja, JA ...

  13. Browse Title Index

    African Journals Online (AJOL)

    Items 701 - 750 of 763 ... Vol 10, No 9 (2016), The use of magnetic susceptibility measurements to determine pollution of agricultural soils in road proximity, Abstract PDF. F Brempong, Q ... Vol 6, No 11 (2012), Toxicity assessment of treated effluents from a textile industry in Lagos, Nigeria, Abstract PDF. VJ Odjegba, NM ...

  14. Browse Title Index

    African Journals Online (AJOL)

    Items 501 - 550 of 604 ... Vol 23, No 1 (2013), The bacteriological safety and antimicrobial susceptibility of bacteria isolated from street-vended white lupin (Lupinus albus) in Bahir Dar, Ethiopia, Abstract PDF. M Kibret, M Tadesse. Vol 27, No 5 (2017), The barriers to achieve financial protection in Iranian health system: a ...

  15. Browse Title Index

    African Journals Online (AJOL)

    Vol 12, No 5 (2013), Investigation of Association between Slime Production by Candida Spp and Susceptibility to Fluconazole and Voriconazole, Abstract PDF. B Kaskatepe, S Yildiz. Vol 12, No 4 (2013), Investigation of Factors Affecting Microdialysis Probe Delivery and Recovery of Puerarin In Vitro, Abstract PDF. P Li, Y Lu ...

  16. Browse Title Index

    African Journals Online (AJOL)

    Items 51 - 100 of 985 ... Vol 16 (2010), A Study Of The Internal Energy And Magnetic Spin Susceptibility Of The 2-D Hubbard Model Representation Of High Temperature Superconductors Via An Exact-Approach, Abstract. PO Akusu. Vol 19 (2011), A study on switched linear system identification using game-theoretic strategies ...

  17. Browse Title Index

    African Journals Online (AJOL)

    Items 201 - 246 of 246 ... Vol 11, No 1 (2014), Susceptibility of clinical isolates of uropathogenic bacteria from Southwest Nigeria to antibiotics and extracts of Brachystegia eurycoma Harms (Leguminosae), Abstract. PA Idowu, BM Okanlawon. Vol 12, No 2 (2015), Synergistic effect of Murraya koenigii and Telfairia occidentalis ...

  18. Browse Title Index

    African Journals Online (AJOL)

    Items 501 - 550 of 571 ... Vol 9, No 3 (2007), Suicidal ideation and associated factors among in-school adolescents in Zambia, Abstract PDF. A S Muula, L N Kazembe, E Rudatsikira, S Siziya. Vol 9, No 1 (2007), Susceptibility of Simulium damnosum complex larvae to temephos in the Tukuyu onchocerciasis focus, southwest ...

  19. Browse Title Index

    African Journals Online (AJOL)

    Items 251 - 300 of 361 ... Vol 47, No 1 (2001), Supernumerary teeth: literature review, Abstract. PVV Prasad Rao, M M Chidzonga. Vol 47, No 9 (2001), Susceptability of Zimbabwean Streptococcus agalactiae (group B streptococcus; GBS) isolates to four different antibiotics, Abstract. S R Moyo, J A Maeland, E S Munemo.

  20. Browse Title Index

    African Journals Online (AJOL)

    Items 201 - 250 of 281 ... Vol 27, No 3 (2015), Role of parents as a protective factor against adolescent athletes' doping susceptibility, Abstract PDF. C Blank, V Leichtfried, D Müller, W Schobersberger. Vol 23, No 4 (2011), Rugby-playing history at the national U13 level and subsequent participation at the national U16 and ...

  1. Browse Title Index

    African Journals Online (AJOL)

    Items 1 - 50 of 117 ... Vol 23, No 1 (2008), Anticoagulant Control Results among Patients with Mechanical Heart Valves at Muhimbili National hospital, Tanzania, Abstract. A Makubi, J Lwakatare, J Nordrehaug, P Magesa. Vol 21, No 1 (2006), Antimicrobial susceptibility patterns of Salmonella typhi and Candida Albicans ...

  2. Rapid microwave-assisted synthesis of PVP-coated ultrasmall gadolinium oxide nanoparticles for magnetic resonance imaging

    Energy Technology Data Exchange (ETDEWEB)

    Vahdatkhah, Parisa [Department of Materials Science and Engineering, Sharif University of Technology (Iran, Islamic Republic of); Madaah Hosseini, Hamid Reza, E-mail: Madaah@sharif.ir [Department of Materials Science and Engineering, Sharif University of Technology (Iran, Islamic Republic of); Khodaei, Azin [Department of Materials Science and Engineering, Sharif University of Technology (Iran, Islamic Republic of); Montazerabadi, Ali Reza [Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences (Iran, Islamic Republic of); Irajirad, Rasoul [Biomolecular Image Analysis Group, Research Center for Molecular and Cellular Imaging, Tehran University of Medical Sciences (Iran, Islamic Republic of); Oghabian, Mohamad Ali [Biomolecular Image Analysis Group, Research Center for Molecular and Cellular Imaging, Tehran University of Medical Sciences (Iran, Islamic Republic of); Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences (Iran, Islamic Republic of); Delavari, Hamid H., E-mail: Hamid.delavari@modares.ac.ir [Department of Materials Engineering, Tarbiat Modares University, Tehran, PO Box 14115-143 (Iran, Islamic Republic of)

    2015-05-12

    Highlights: • A rapid microwave-assisted polyol process used to synthesize Gd{sub 2}O{sub 3} nanoparticles. • In situ surface modification of ultrasmall Gd{sub 2}O{sub 3}NPs with PVP has been performed. • Gd{sub 2}O{sub 3}NPs shows considerable increasing of relaxivity in comparison to Gd-chelates. • PVP-covered Gd{sub 2}O{sub 3}NPs show appropriate stability for approximately 15 days. • Spectrophotometric indicates the leaching of free Gd ions not occurred versus time. - Abstract: Synthesis of polyvinyl pyrrolidone (PVP) coated ultrasmall Gd{sub 2}O{sub 3} nanoparticles (NPs) with enhanced T{sub 1}-weighted signal intensity and r{sub 2}/r{sub 1} ratio close to unity is performed by a microwave-assisted polyol process. PVP coated Gd{sub 2}O{sub 3}NPs with spherical shape and uniform size of 2.5 ± 0.5 nm have been synthesized below 5 min and structure and morphology confirmed by HRTEM, XRD and FTIR. The longitudinal (r{sub 1}) and transversal relaxation (r{sub 2}) of Gd{sub 2}O{sub 3}NPs is measured by a 3 T MRI scanner. The results showed considerable increasing of relaxivity for Gd{sub 2}O{sub 3}NPs in comparison to gadolinium chelates which are commonly used for clinical magnetic resonance imaging. In addition, a mechanism for Gd{sub 2}O{sub 3}NPs formation and in situ surface modification of PVP-grafted Gd{sub 2}O{sub 3}NPs is proposed.

  3. Effect of PVP on the characteristic of modified membranes made from waste PET bottles for humic acid removal.

    Science.gov (United States)

    Arahman, Nasrul; Fahrina, Afrillia; Amalia, Sastika; Sunarya, Rahmat; Mulyati, Sri

    2017-01-01

    Background: The aim of the present study was to evaluate the possibility of using recycled polymer (waste polyethylene terephthalate [PET] bottles) as a membrane material. Furthermore, the effect of the addition of a pore-forming agent and preparation conditions was also observed. Methods: Porous polymeric membranes were prepared via thermally induced phase separation by dissolving recycled PET in phenol. PET polymer was obtained from waste plastic bottles as a new source of polymeric material. For original PET membrane, the casting solution was prepared by dissolving of 20wt% PET in phenol solution. For PET modified membrane, a 5 wt% of polyvinylpyrrolidone (PVP) was added into polymer solution. The solution was cast onto a glass plate at room temperature followed by evaporation before the solidification process. The membranes formed were characterized in terms of morphology, chemical group, and filtration performance. A humic acid solution was used to identify the permeability and the solute rejection of the membranes. Results: The results showed that the recycled PET from waste plastic bottles was applicable to use as a membrane material for a water treatment process. The maximum flux of 97.0 l/m (2).hr was obtained from filtration test using PET membrane. The highest rejection of humic acid in a water sample, which reached up to 75.92%, was obtained using the PET/PVP membrane. Conclusions: The recycled PET from waste bottles was successfully used to prepare porous membrane. The membrane was modified by the addition of PVP as a membrane modifying agent. SEM analysis confirmed that the original PET membrane has a rough and large pore structure. The addition of PVP improved the pore density with a narrow pore structure. The PET/PVP membrane conditioned with evaporation was the best in humic acid rejection.

  4. Characterization of modular bacteriophage endolysins from Myoviridae phages OBP, 201φ2-1 and PVP-SE1.

    Directory of Open Access Journals (Sweden)

    Maarten Walmagh

    Full Text Available Peptidoglycan lytic enzymes (endolysins induce bacterial host cell lysis in the late phase of the lytic bacteriophage replication cycle. Endolysins OBPgp279 (from Pseudomonas fluorescens phage OBP, PVP-SE1gp146 (Salmonella enterica serovar Enteritidis phage PVP-SE1 and 201φ2-1gp229 (Pseudomonas chlororaphis phage 201φ2-1 all possess a modular structure with an N-terminal cell wall binding domain and a C-terminal catalytic domain, a unique property for endolysins with a Gram-negative background. All three modular endolysins showed strong muralytic activity on the peptidoglycan of a broad range of Gram-negative bacteria, partly due to the presence of the cell wall binding domain. In the case of PVP-SE1gp146, this domain shows a binding affinity for Salmonella peptidoglycan that falls within the range of typical cell adhesion molecules (K(aff = 1.26 × 10(6 M(-1. Remarkably, PVP-SE1gp146 turns out to be thermoresistant up to temperatures of 90 °C, making it a potential candidate as antibacterial component in hurdle technology for food preservation. OBPgp279, on the other hand, is suggested to intrinsically destabilize the outer membrane of Pseudomonas species, thereby gaining access to their peptidoglycan and exerts an antibacterial activity of 1 logarithmic unit reduction. Addition of 0.5 mM EDTA significantly increases the antibacterial activity of the three modular endolysins up to 2-3 logarithmic units reduction. This research work offers perspectives towards elucidation of the structural differences explaining the unique biochemical and antibacterial properties of OBPgp279, PVP-SE1gp146 and 201φ2-1gp229. Furthermore, these endolysins extensively enlarge the pool of potential antibacterial compounds used against multi-drug resistant Gram-negative bacterial infections.

  5. Browse Title Index

    African Journals Online (AJOL)

    Items 201 - 250 of 251 ... Vol 8, No 1 (2006), Susceptibility of hospital strains of staphylococcus aureus to Isol®, Dettol® Purit®, and Septol® disinfectants marketed in Nsukka, Enugu State, Abstract. IR Iroha, N Onwa, C Okeh, O Nworie, J Nnaji, JO Orji. Vol 4, No 2 (2002), Tear break-up time among menopausal women ...

  6. Titles are "serious stuff": a historical study of academic titles

    OpenAIRE

    Salager-Meyer, Françoise; Alcaraz Ariza, María Ángeles

    2013-01-01

    In this paper we carried out a diachronic analysis (1840-2009) of a corpus of 180 medical case report titles drawn from the British Medical Journal. We analyzed a series of quantitative variables (number of authors and their institutional affiliation, title length, and punctuation/grammatical data) and qualitative variables (authors’ collaboration and types of titles). The results of our research show various shifts over the period studied that could be attributed to the following factors: 1)...

  7. PVP-coated silver nanoparticles block the transmission of cell-free and cell-associated HIV-1 in human cervical culture

    Directory of Open Access Journals (Sweden)

    Rodriguez-Padilla Cristina

    2010-07-01

    Full Text Available Abstract Background Previous in vitro studies have demonstrated that polyvinylpyrrolidone coated silver nanoparticles (PVP-coated AgNPs have antiviral activity against HIV-1 at non-cytotoxic concentrations. These particles also demonstrate broad spectrum virucidal activity by preventing the interaction of HIV-1 gp120 and cellular CD4, thereby inhibiting fusion or entry of the virus into the host cell. In this study, we evaluated the antiviral activity of PVP-coated AgNPs as a potential topical vaginal microbicide to prevent transmission of HIV-1 infection using human cervical culture, an in vitro model that simulates in vivo conditions. Results When formulated into a non-spermicidal gel (Replens at a concentration of 0.15 mg/mL, PVP-coated AgNPs prevented the transmission of cell-associated HIV-1 and cell-free HIV-1 isolates. Importantly, PVP-coated AgNPs were not toxic to the explant, even when the cervical tissues were exposed continuously to 0.15 mg/mL of PVP-coated AgNPs for 48 h. Only 1 min of PVP-coated AgNPs pretreatment to the explant was required to prevent transmission of HIV-1. Pre-treatment of the cervical explant with 0.15 mg/mL PVP-coated AgNPs for 20 min followed by extensive washing prevented the transmission of HIV-1 in this model for 48 h. Conclusions A formulation of PVP-coated AgNPs homogenized in Replens gel acts rapidly to inhibit HIV-1 transmission after 1 min and offers long-lasting protection of the cervical tissue from infection for 48 h, with no evidence of cytotoxicity observed in the explants. Based on this data, PVP-coated AgNPs are a promising microbicidal candidate for use in topical vaginal/cervical agents to prevent HIV-1 transmission, and further research is warranted.

  8. Conditioned taste avoidance, conditioned place preference and hyperthermia induced by the second generation 'bath salt' α-pyrrolidinopentiophenone (α-PVP).

    Science.gov (United States)

    Nelson, Katharine H; Hempel, Briana J; Clasen, Matthew M; Rice, Kenner C; Riley, Anthony L

    2017-05-01

    α-Pyrrolidinopentiophenone (α-PVP) has been reported to be rewarding in a variety of pre-clinical models. Given that a number of drugs of abuse have both rewarding and aversive effects, the balance of which influences addiction potential, the present study examined the aversive properties of α-PVP by assessing its ability to induce taste avoidance. This assessment was made in a combined taste avoidance/place conditioning design that also allowed an evaluation of the relationship between α-PVP's aversive and rewarding effects. Male Sprague-Dawley rats were exposed to a novel saccharin solution, injected with one of four doses of α-PVP (0, 0.3, 1.0 and 3.0mg/kg) (IP) and placed on one side of a place conditioning apparatus. The next day, they were injected with vehicle, given access to water and placed on the other side. Following four conditioning cycles, saccharin avoidance and place preferences were then assessed. The effects of α-PVP on body temperature were also examined. α-PVP induced dose-dependent taste avoidance as well as significant increases in time spent on the drug-paired side (although this effect was not dependent on dose). α-PVP also induced dose- and time-dependent hyperthermia. α-PVP induced significant taste avoidance whose strength relative to the psychostimulants methylenedioxypyrovalerone (MDPV) and cocaine paralleled their relative binding to the dopamine transporter. Similar to other drugs of abuse, α-PVP has both aversive and rewarding effects. It will be important to assess how various experiential and subject variables impact these effects and their balance to predict abuse liability. Copyright © 2017 Elsevier Inc. All rights reserved.

  9. What makes a good title?

    Science.gov (United States)

    Grant, Maria J

    2013-12-01

    The chances are the first thing you when you set out to write an article is the title. But what factors transform a mediocre title into a good title? Firstly, it should be both informative and specific, using words or phrases likely to be used when searching for information, for example 'nurse education' rather than simply 'nurse'. Secondly, it should be concise yet convey the main ideas clearly; articles with short titles reporting study findings have been found to attract higher numbers of viewing and citations. Thirdly, provide details of the study design to assist the reader in making an informed choice about the type of project your article is reporting. In taking these small steps when developing your title, your title can present a more concise, retrievable and clear articulation of your article. © 2013 The authors. Health Information and Libraries Journal © 2013 Health Libraries Group.

  10. Long-Term Physical Stability of PVP- and PVPVA-Amorphous Solid Dispersions.

    Science.gov (United States)

    Lehmkemper, Kristin; Kyeremateng, Samuel O; Heinzerling, Oliver; Degenhardt, Matthias; Sadowski, Gabriele

    2017-01-03

    The preparation of amorphous solid dispersion (ASD) formulations is a promising strategy to improve the bioavailability of an active pharmaceutical ingredient (API). By dissolving the API in a polymer it is stabilized in its amorphous form, which usually shows higher water solubility than its crystalline counterpart. To prevent recrystallization, the long-term physical stability of ASD formulations is of big interest. In this work, the solubility of the APIs acetaminophen and naproxen in the excipient polymers poly(vinylpyrrolidone) (PVP K25) and poly(vinylpyrrolidone-co-vinyl acetate) (PVPVA64) was calculated with three models: the Perturbed-Chain Statistical Associating Fluid Theory (PC-SAFT), the Flory-Huggins model (FH), and an empirical model (Kyeremateng et al., J. Pharm. Sci, 2014, 103, 2847-2858). PC-SAFT and FH were further used to predict the influence of relative humidity (RH) on the API solubility in the polymers. The Gordon-Taylor equation was applied to model the glass-transition temperature of dry ASD and at humid conditions. The calculations were validated by 18 months-long stability studies at standardized storage conditions, 25 °C/0% RH, 25 °C/60% RH, and 40 °C/75% RH. The results of the three modeling approaches for the API solubility in polymers agreed with the experimental solubility data, which are only accessible at high temperatures in dry polymers. However, at room temperature FH resulted in a lower solubility of the APIs in the dry polymers than PC-SAFT and the empirical model. The impact of RH on the solubility of acetaminophen was predicted to be small, but naproxen solubility in the polymers was predicted to decrease with increasing RH with both, PC-SAFT and FH. At 25 °C/60% RH and 40 °C/75% RH, PC-SAFT is in agreement with all results of the long-term stability studies, while FH underestimates the acetaminophen solubility in PVP K25 and PVPVA64.

  11. Combined DFT/FTIR structural studies of monodispersed PVP/Gold and silver nano particles

    Energy Technology Data Exchange (ETDEWEB)

    Abdelghany, A.M., E-mail: a.m_abdelghany@yahoo.com [Spectroscopy Department, Physics Division, National Research Center, Dokki, 12311, Cairo (Egypt); Mekhail, M.Sh.; Abdelrazek, E.M.; Aboud, M.M. [Physics Department, Faculty of Science, Mansoura University, 35516, Mansoura (Egypt)

    2015-10-15

    Nano-particles of two Nobel metals, namely, (silver and gold) were prepared and used as a dopant in polyvinyl pyrrolidone (PVP) polymeric matrix by the simple casting technique. Prepared samples examined theoretically using density functional theory (DFT) and experimentally with Fourier transform infrared (FTIR) and (UV/Vis) spectroscopy. DFT calculations and FTIR experimental results shows the persistence of the characteristic bands of polymeric network in their positions while pyrrolidinone adsorbed both silver and gold colloid surfaces preferably via the non-bonding electrons of the carbonyl group. UV/Vis experimental data was employed to calculate the optical energy gap of pristine and doped samples. Optical band gap and particle size were calculated and is in agreement with the results obtained from TEM data. Transmission electron microscopy shows that the prepared silver and gold nanoparticles were mono dispersed within the polymeric matrix. - Highlights: • Nano-particles of two Nobel metals, namely, (silver and gold) were prepared. • Polyvinyl pyrrolidone polymeric matrix doped with nobel metal were prepared via casting technique. • Prepared samples investigated via combined (DFT) and (FTIR). • Transmission electron microscopy shows monodispersed nanoparticles.

  12. Change spectroscopic studies and optimization electrical properties of PVP/PEO doped copper phthalocyanines

    Energy Technology Data Exchange (ETDEWEB)

    Ragab, H.M., E-mail: yara20092009@yahoo.com [Department of Physics, Faculty of Science, Al-Azhar University, Girls Branch, Cairo 11754 (Egypt); Basic Science Department, Faculty of Preparatory Year, Hail University (Saudi Arabia); Ahmad, F.; Radwan, Sh.N. [Department of Physics, Faculty of Science, Al-Azhar University, Girls Branch, Cairo 11754 (Egypt)

    2016-12-01

    Composite films of polyvinyl pyrrolidone and Polyethylene oxide (PVP/PEO) blend doped with 1, 4 and 12 wt% of copper Phthalocyanines (CuPc) were prepared by casting method. The samples were studied using different techniques. The X-ray (XRD) revealed average crystallite size and X-ray intensity decrease at 1 CuPc %; this implies to an increase on the degree of amorphousity, then increase at CuPc >1%. The change in both the intensity and position of some absorption peaks of the blend with CuPc content were observed in Fourier transform infrared (FTIR) spectroscopy suggest the complexation of polymer blend. The UV–Vis spectroscopy revealed that the optical band gap decreases as well as band tail width increases with increasing CuPc concentration. It may be reflect the role of CuPc in modifying the electronic structure of the polymeric matrix. The charge carrier concentration is responsible for conductivity improvement in electrolytes rather than the mobility.

  13. Synthesis and Raman analysis of SnS nanoparticles synthesized by PVP assisted polyol method

    Energy Technology Data Exchange (ETDEWEB)

    Baby, Benjamin Hudson; Mohan, D. Bharathi, E-mail: d.bharathimohan@gmail.com [Department of Physics, School of Physical, Chemical and Applied Sciences, Pondicherry University, R.V. Nagar, Kalapet, Puducherry-605014 (India)

    2015-06-24

    SnS film was prepared by a simple drop casting method after synthesizing SnS nanoparticles by using PVP assisted polyol method. Confocal Raman study was carried out for the as deposited and annealed (150, 300 and 400 °C) films at two different excitation wavelengths 514 and 785 nm. At the excitation wavelength of 514 nm, the Raman modes showed for a mixed phase of SnS and SnS{sub 2} up to 150 °C and then only a pure SnS phase was observed up to 400 °C due to the dissociation of SnS{sub 2} in to SnS by releasing S. The increase in intensity of Raman (A{sub g} and B{sub 3g}) as well as IR (B{sub 3u}) active modes of SnS are observed with increasing annealing temperature at excitation wavelength 785 nm due to the increased crystallinity and inactiveness of SnS{sub 2} modes. X-ray diffraction confirming the formation of a single phase of SnS while the greater homogeneity in both size and shape of SnS nanoparticles were confirmed through surface morphology from SEM.

  14. Calcined Solution-Based PVP Influence on ZnO Semiconductor Nanoparticle Properties

    Directory of Open Access Journals (Sweden)

    Halimah Mohamed Kamari

    2017-02-01

    Full Text Available A water-based solution of polyvinylpyrrolidone (PVP at various concentrations and zinc nitrates were used in conjunction with calcination to produce zinc oxide semiconductor nanoparticles. The extent to which the zinc oxide semiconductor nanoparticles had become crystallized was measured using X-ray diffraction (XRD, whilst morphological characteristics were determined using scanning electron microscopy (SEM. Transmission electron microscopy (TEM supported by XRD results were used to evaluate the average particle size. Fourier transform infrared spectroscopy (FT-IR was then carried out in order to identify the composition phase, since this suggested that the samples contained metal oxide bands and that all organic compounds had been effectively removed after calcination. A UV-VIS spectrophotometer was used to determine the energy band gap and illustrate optical features. Additionally, photoluminescence (PL spectra revealed that the intensity of photoluminescence decreased with a decrease in particle size. The obtained results have mainly been inclusive for uses by several semiconductor applications in different fields, such as environmental applications and studies, since an absorption process for energy wavelengths could efficiently occur.

  15. PVP capped silver nanocubes assisted removal of glyphosate from water-A photoluminescence study.

    Science.gov (United States)

    Sarkar, Sumit; Das, Ratan

    2017-10-05

    Glyphosate [N-phosphono-methylglycine (PMG)] is the most used herbicide worldwide and it has been reported very recently that Glyphosate is very harmful and can produce lots of diseases such as alzheimer and parkinson's disease, depression, cancer, infertility including genotoxic effects. As it is mostly present in stable water body and ground water system, its detection and removal is very important. Here, we have shown a fluorescence technique for the removal of glyphosate from water using chemically synthesized polyvinylpyrrolidone (PVP) silver nanocrystals. Transmission Electron Microscopy (TEM) study shows the average size of silver nanocrystals of 100nm approximately with a morphology of cubic shape. Glyphosate does not show absorption in the visible region. But both glyphosate and silver nanocrystals show strong fluorescence in the visible region. So, photoluminescence study has been successfully utilized to detect the glyphosate in water samples and on treating the glyphosate contaminated water sample with silver nanocrystals, the sample shows no emission peak of glyphosate at 458nm. Thus, this approach is a promising and very rapid method for the detection and removal of glyphosate from water samples on treatment with silver nanocubes. NMR spectra further confirms that the silver nanocrystals treated contaminated water samples are glyphosate free. Copyright © 2017 Elsevier B.V. All rights reserved.

  16. Change spectroscopic studies and optimization electrical properties of PVP/PEO doped copper phthalocyanines

    Science.gov (United States)

    Ragab, H. M.; Ahmad, F.; Radwan, Sh. N.

    2016-12-01

    Composite films of polyvinyl pyrrolidone and Polyethylene oxide (PVP/PEO) blend doped with 1, 4 and 12 wt% of copper Phthalocyanines (CuPc) were prepared by casting method. The samples were studied using different techniques. The X-ray (XRD) revealed average crystallite size and X-ray intensity decrease at 1 CuPc %; this implies to an increase on the degree of amorphousity, then increase at CuPc >1%. The change in both the intensity and position of some absorption peaks of the blend with CuPc content were observed in Fourier transform infrared (FTIR) spectroscopy suggest the complexation of polymer blend. The UV-Vis spectroscopy revealed that the optical band gap decreases as well as band tail width increases with increasing CuPc concentration. It may be reflect the role of CuPc in modifying the electronic structure of the polymeric matrix. The charge carrier concentration is responsible for conductivity improvement in electrolytes rather than the mobility.

  17. Influence of Copolymer Composition on In Vitro and In Vivo Performance of Celecoxib-PVP/VA Amorphous Solid Dispersions

    DEFF Research Database (Denmark)

    Knopp, Matthias Manne; Nguyen, Julia Hoang; Mu, Huiling

    2016-01-01

    of the copolymer composition of polyvinylpyrrolidone/vinyl acetate (PVP/VA) on the non-sink in vitro dissolution behavior and in vivo performance of celecoxib (CCX) amorphous solid dispersions. The study showed that the hydrophilic monomer vinylpyrrolidone (VP) was responsible for the generation of CCX...... supersaturation whereas the hydrophobic monomer vinyl acetate (VA) was responsible for the stabilization of the supersaturated solution. For CCX, there was an optimal copolymer composition around 50-60% VP content where further replacement of VP monomers with VA monomers did not have any biopharmaceutical...... advantages. A linear relationship was found between the in vitro AUC0-4h and in vivo AUC0-24h for the CCX:PVP/VA systems, indicating that the non-sink in vitro dissolution method applied in this study was useful in predicting the in vivo performance. These results indicated that when formulating a poorly...

  18. Effectiveness of ascorbic acid and PVP in the rooting of clonal minicuttings of Eucalyptus urophylla x Eucalyptus grandis

    Directory of Open Access Journals (Sweden)

    Lucas Amaral de Melo

    2011-12-01

    Full Text Available The objective of this study is to evaluate the effectiveness of the antioxidants ascorbic acid and polyvinylpyrrolidone (PVP in the rooting of mini-cuttings for three clones of Eucalyptus urophylla x Eucalyptus grandis. Mini-cuttings were gathered from a mini-clonal hedge which had been cultivated in concrete ducts containing washed sand. Five concentrations of each antioxidant were experimentally tested on each of the three clones (C1, C2 and C3. Assessments were done of mini-cutting survival and rooting rates when leaving the greenhouse and the shade house, as well as seedling survival and growth at age 50 days. Ascorbic acid was found to be beneficial to the mini-cuttings of the clone with a lower rooting percentage (C3, whereas PVP was found to be unbeneficial to the clones being studied.

  19. Effect of PVP as a capping agent in single reaction synthesis of nanocomposite soft/hard ferrite nanoparticles

    Energy Technology Data Exchange (ETDEWEB)

    Ahmad, H.A. [Department of Physics, Faculty of Science, Universiti Putra Malaysia, UPM, 43400 Serdang, Selangor (Malaysia); Saiden, N.M., E-mail: nlaily@upm.edu.my [Department of Physics, Faculty of Science, Universiti Putra Malaysia, UPM, 43400 Serdang, Selangor (Malaysia); Saion, E.; Azis, R.S.; Mamat, M.S. [Department of Physics, Faculty of Science, Universiti Putra Malaysia, UPM, 43400 Serdang, Selangor (Malaysia); Hashim, M. [Advanced Material and Nanotechnology Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, UPM, 43400 Serdang, Selangor (Malaysia)

    2017-04-15

    Nanocomposite magnets consist of soft and hard ferrite phases are known as an exchange spring magnet when they are sufficiently spin exchange coupled. Hard and soft ferrites offer high value of coercivity, H{sub c} and saturation magnetization, M{sub s} respectively. In order to obtain a better permanent magnet, both soft and hard ferrite phases need to be “exchange coupled”. The nanoparticles were prepared by a simple one-pot technique of 80% soft phase and 20% hard phase. This technique involves a single reaction mixture of metal nitrates and aqueous solution of varied amounts of polyvinylpyrrolidone (PVP). The heat treatment applied was at 800 °C for 3 h. The synthesized composites were characterized by Transmission Electron Microscope (TEM), Fourier Transform Infra-red (FT-IR), Energy Dispersive X-Ray (EDX), X-ray diffraction (XRD) and Vibrating sample magnetometer (VSM). The coexistence of two phases, Ni{sub 0.5}Zn{sub 0.5}Fe{sub 2}O{sub 4} and SrFe{sub 12}O{sub 19} were observed by XRD patterns. It also verified by the EDX that no impurities detected. The magnetic properties of nanocomposite ferrites for 0.06 g/ml PVP gives a better properties of H{sub c} 932 G and M{sub s} 39.0 emu/g with average particle size obtained from FESEM was 49.2 nm. The concentration of PVP used gives effect on the magnetic properties of the samples. - Highlights: • Amount of PVP play important roles in controlling the particle size distribution and magnetic properties. • This is a novel technique to produce nanocomposite ferrites effectively. • This study contributes better understanding on magnetic properties in nanoparticle composite magnets.

  20. Title III/Title IV Authorities Necessary for Full and Interim Title V Program Approval

    Science.gov (United States)

    This document may be of assistance in applying the Title V air operating permit regulations. This document is part of the Title V Policy and Guidance Database available at www2.epa.gov/title-v-operating-permits/title-v-operating-permit-policy-and-guidance-document-index. Some documents in the database are a scanned or retyped version of a paper photocopy of the original. Although we have taken considerable effort to quality assure the documents, some may contain typographical errors. Contact the office that issued the document if you need a copy of the original.

  1. Does prostate configuration affect the efficacy and safety of GreenLight HPS™ laser photoselective vaporization prostatectomy (PVP)?

    Science.gov (United States)

    Gu, Xiao; Strom, Kurt; Spaliviero, Massimiliano; Wong, Carson

    2013-02-01

    We evaluate the efficacy and safety of GreenLight HPS™ laser photoselective vaporization prostatectomy (PVP) for the treatment of benign prostatic hyperplasia (BPH) with different prostate configuration. Patients were stratified into two groups: bilobe (group I) and trilobe (group II) BPH. Transurethral PVP was performed using a 120 W GreenLight HPS™ side-firing laser system. American Urological Association Symptom Score (AUASS), Quality of Life (QoL) score, maximum flow rate (Q max), and postvoid residual (PVR) were measured preoperatively and at 1 and 4 weeks and 3, 6, 12, 18, 24 and 36 months postoperatively. A number of 160 consecutive patients were identified (I: 86, II: 74). Among the preoperative parameters, there were significant differences (p  0.05). Significant differences (p  0.05). The incidences of adverse events were low and similar in both groups. Our experience suggests that BPH configuration has little effect on the efficacy and safety of GreenLight HPS™ laser PVP.

  2. Prediction of thermal conductivity of polyvinylpyrrolidone (PVP) electrospun nanocomposite fibers using artificial neural network and prey-predator algorithm

    Science.gov (United States)

    Khan, Waseem S.; Hamadneh, Nawaf N.

    2017-01-01

    In this study, multilayer perception neural network (MLPNN) was employed to predict thermal conductivity of PVP electrospun nanocomposite fibers with multiwalled carbon nanotubes (MWCNTs) and Nickel Zinc ferrites [(Ni0.6Zn0.4) Fe2O4]. This is the second attempt on the application of MLPNN with prey predator algorithm for the prediction of thermal conductivity of PVP electrospun nanocomposite fibers. The prey predator algorithm was used to train the neural networks to find the best models. The best models have the minimal of sum squared error between the experimental testing data and the corresponding models results. The minimal error was found to be 0.0028 for MWCNTs model and 0.00199 for Ni-Zn ferrites model. The predicted artificial neural networks (ANNs) responses were analyzed statistically using z-test, correlation coefficient, and the error functions for both inclusions. The predicted ANN responses for PVP electrospun nanocomposite fibers were compared with the experimental data and were found in good agreement. PMID:28934220

  3. Risk Prediction of New Adjacent Vertebral Fractures After PVP for Patients with Vertebral Compression Fractures: Development of a Prediction Model

    Energy Technology Data Exchange (ETDEWEB)

    Zhong, Bin-Yan; He, Shi-Cheng; Zhu, Hai-Dong [Southeast University, Department of Radiology, Medical School, Zhongda Hospital (China); Wu, Chun-Gen [Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Department of Diagnostic and Interventional Radiology (China); Fang, Wen; Chen, Li; Guo, Jin-He; Deng, Gang; Zhu, Guang-Yu; Teng, Gao-Jun, E-mail: gjteng@vip.sina.com [Southeast University, Department of Radiology, Medical School, Zhongda Hospital (China)

    2017-02-15

    PurposeWe aim to determine the predictors of new adjacent vertebral fractures (AVCFs) after percutaneous vertebroplasty (PVP) in patients with osteoporotic vertebral compression fractures (OVCFs) and to construct a risk prediction score to estimate a 2-year new AVCF risk-by-risk factor condition.Materials and MethodsPatients with OVCFs who underwent their first PVP between December 2006 and December 2013 at Hospital A (training cohort) and Hospital B (validation cohort) were included in this study. In training cohort, we assessed the independent risk predictors and developed the probability of new adjacent OVCFs (PNAV) score system using the Cox proportional hazard regression analysis. The accuracy of this system was then validated in both training and validation cohorts by concordance (c) statistic.Results421 patients (training cohort: n = 256; validation cohort: n = 165) were included in this study. In training cohort, new AVCFs after the first PVP treatment occurred in 33 (12.9%) patients. The independent risk factors were intradiscal cement leakage and preexisting old vertebral compression fracture(s). The estimated 2-year absolute risk of new AVCFs ranged from less than 4% in patients with neither independent risk factors to more than 45% in individuals with both factors.ConclusionsThe PNAV score is an objective and easy approach to predict the risk of new AVCFs.

  4. Characterization and optimization of electrospun TiO2/PVP nanofibers using Taguchi design of experiment method

    Directory of Open Access Journals (Sweden)

    H. Albetran

    2015-09-01

    Full Text Available TiO2 nanofibers were prepared within polyvinylpyrrolidone (PVP polymer using a combination of sol–gel and electrospinning techniques. Based on a Taguchi design of experiment (DoE method, the effects of sol–gel and electrospinning on the TiO2/PVP nanofibers’ diameter, including titanium isopropoxide (TiP concentration, flow rate, needle tip-to-collector distance, and applied voltage were evaluated. The analysis of DoE experiments for nanofiber diameters demonstrated that TiP concentration was the most significant factor. An optimum combination to obtain smallest diameters was also determined with a minimum variation for electrospun TiO2/PVP nanofibers. The optimum combination was determined to be a 60% TiP concentration, at a flow rate of 1 ml/h, with the needle tip-to-collector distance at 11 cm (position a, and the applied voltage of 18 kV. This combination was further validated by conducting a confirmation experiment that used two different needles to study the effect of needle size. The average nanofiber diameter was approximately the same for both needle sizes in good accordance with the optimum condition estimated by the Taguchi DoE method.

  5. A novel biocompatible conducting polyvinyl alcohol (PVA)-polyvinylpyrrolidone (PVP)-hydroxyapatite (HAP) composite scaffolds for probable biological application.

    Science.gov (United States)

    Chaudhuri, B; Mondal, B; Ray, S K; Sarkar, S C

    2016-07-01

    We have prepared biocompatible composites of 80wt% polyvinyl alcohol (PVA)-(20wt%) polyvinylpyrrolidone (PVP) blend with different concentrations of bioactive nanohydroxyapatite, Ca10(PO4)6(HO)2 (HAP). The composite films demonstrated maximum effective conductivity (σ∼1.64×10(-4)S/m) and effective dielectric constant (ε∼290) at percolation threshold concentration (∼10wt% HAP) at room temperature. These values of σ and ε are much higher than those of PVA, PVP or HAP. Our preliminary observation indicated excellent biocompatibility of the electrospun fibrous meshes of two of these composites with different HAP contents (8.5 and 5wt% within percolation threshold concentration) using NIH 3T3 fibroblast cell line. Cells viability on the well characterized composite fibrous scaffolds was determined by MTT [3-(4,5-di-methylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay analysis. Enhancement of σ, due to HAP addition, was found to show increased biocompatibility of the fibrous scaffold. Enhanced σ value of the PVA/PVP-HAP composite provided supporting cues for the increased cell viability and biocompatibility of the composite fibrous meshes. Excellent biocompatibility these electrospun composite scaffolds made them to plausible potential candidates for tissue engineering or other biomedical applications. Copyright © 2016 Elsevier B.V. All rights reserved.

  6. Prediction of thermal conductivity of polyvinylpyrrolidone (PVP) electrospun nanocomposite fibers using artificial neural network and prey-predator algorithm.

    Science.gov (United States)

    Khan, Waseem S; Hamadneh, Nawaf N; Khan, Waqar A

    2017-01-01

    In this study, multilayer perception neural network (MLPNN) was employed to predict thermal conductivity of PVP electrospun nanocomposite fibers with multiwalled carbon nanotubes (MWCNTs) and Nickel Zinc ferrites [(Ni0.6Zn0.4) Fe2O4]. This is the second attempt on the application of MLPNN with prey predator algorithm for the prediction of thermal conductivity of PVP electrospun nanocomposite fibers. The prey predator algorithm was used to train the neural networks to find the best models. The best models have the minimal of sum squared error between the experimental testing data and the corresponding models results. The minimal error was found to be 0.0028 for MWCNTs model and 0.00199 for Ni-Zn ferrites model. The predicted artificial neural networks (ANNs) responses were analyzed statistically using z-test, correlation coefficient, and the error functions for both inclusions. The predicted ANN responses for PVP electrospun nanocomposite fibers were compared with the experimental data and were found in good agreement.

  7. Effect of PVP as a capping agent in single reaction synthesis of nanocomposite soft/hard ferrite nanoparticles

    Science.gov (United States)

    Ahmad, H. A.; Saiden, N. M.; Saion, E.; Azis, R. S.; Mamat, M. S.; Hashim, M.

    2017-04-01

    Nanocomposite magnets consist of soft and hard ferrite phases are known as an exchange spring magnet when they are sufficiently spin exchange coupled. Hard and soft ferrites offer high value of coercivity, Hc and saturation magnetization, Ms respectively. In order to obtain a better permanent magnet, both soft and hard ferrite phases need to be ;exchange coupled;. The nanoparticles were prepared by a simple one-pot technique of 80% soft phase and 20% hard phase. This technique involves a single reaction mixture of metal nitrates and aqueous solution of varied amounts of polyvinylpyrrolidone (PVP). The heat treatment applied was at 800 °C for 3 h. The synthesized composites were characterized by Transmission Electron Microscope (TEM), Fourier Transform Infra-red (FT-IR), Energy Dispersive X-Ray (EDX), X-ray diffraction (XRD) and Vibrating sample magnetometer (VSM). The coexistence of two phases, Ni0.5Zn0.5Fe2O4 and SrFe12O19 were observed by XRD patterns. It also verified by the EDX that no impurities detected. The magnetic properties of nanocomposite ferrites for 0.06 g/ml PVP gives a better properties of Hc 932 G and Ms 39.0 emu/g with average particle size obtained from FESEM was 49.2 nm. The concentration of PVP used gives effect on the magnetic properties of the samples.

  8. Synthesis of Polyvinyl Pirrolidone (PVC /Κ-Carrageenan Hydrogel Prepared by Gamma Radiation Processing As a Function of Dose and PVP Concentration

    Directory of Open Access Journals (Sweden)

    Erizal Erizal

    2013-05-01

    Full Text Available The aim of this research is to prepare a biomaterial to be used in health care. A series of hydrogels based on polyvinyl pyrrolidone (PVP/κ-Carrageenan (KC has been prepared by radiation technique. PVP (5-15% were mixed with ΚC (2% and irradiated by gamma rays at the doses from 25 kGy to 35 kGy (dose rate 7 kGy/h at room temperature. The chemical change of hydrogels was characterized using Fourier Transform infra Red (FTIR. Gel fraction, water absorption and water evaporation were determined gravimetrically. Tensile strength and elongation at break was measured using Instron meter. It was found that with the increase irradiation dose and PVP concentration, the gel fraction and tensile strength of hydrogels increase. In contrast the elongation at break and water absorption of hydrogels decrease. The hydrogel of PVP/KC hydrogel produced by gamma radiation can be considered for wound dressings.

  9. Removal of bovine serum albumin from wastewater using fouling resistant ultrafiltration membranes based on the blends of cellulose acetate, and PVP-TiO2 nanoparticles.

    Science.gov (United States)

    Gebru, Kibrom Alebel; Das, Chandan

    2017-09-15

    Fouling resistant ultrafiltration membranes based on the blends of polyvinylpyrrolidone (PVP), TiO2 nanoparticles and cellulose acetate, CA-PVP-TiO2 (CATP), for removal of bovine serum albumin (BSA) were prepared by using phase inversion process. The influences of PVP and TiO2 on the preparation of phase inverted cellulose acetate (CA) ultrafiltration membrane were explored in terms of morphology study, equilibrium water content (EWC), hydraulic resistance, permeability performance, hydrophilicity, and thermal stability. After the introduction of PVP and TiO2 to the ternary (polymer-solvent-non-solvent) system, the formations of finger-like structures and macro-voids were reduced significantly. An improvement in porosity, average pore size, and hydrophilic nature of the CA membranes were detected after the introduction of PVP and TiO2 into the polymer matrix. The interaction between TiO2 and CA was confirmed and the degradation temperature of the CA membrane was significantly improved. BSA protein removal efficiency, anti-fouling performance, and recycling potential of the UF membranes were investigated. The CATP membrane (10.5 wt % CA: 4 wt % PVP: 2 wt % TiO2) has displayed high BSA removal efficiency and flux recovery ratios (NFR) with enhanced anti-fouling performances for the three fouling/rinsing cycles. Copyright © 2017 Elsevier Ltd. All rights reserved.

  10. 24 CFR 266.405 - Title.

    Science.gov (United States)

    2010-04-01

    ... 24 Housing and Urban Development 2 2010-04-01 2010-04-01 false Title. 266.405 Section 266.405... Requirements; HUD Endorsement § 266.405 Title. (a) Eligibility of title. Marketable title to the mortgaged property must be vested in the mortgagor on the date the mortgage is filed for record. (b) Title evidence...

  11. 24 CFR 202.12 - Title II.

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    2010-04-01

    ... 24 Housing and Urban Development 2 2010-04-01 2010-04-01 false Title II. 202.12 Section 202.12... INSTITUTIONS AND MORTGAGEES Title I and Title II Specific Requirements § 202.12 Title II. (a) Tiered pricing—(1... mortgagee approved for participation in Title II programs is notified by the Secretary that it had a rate of...

  12. 24 CFR 202.11 - Title I.

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    2010-04-01

    ... 24 Housing and Urban Development 2 2010-04-01 2010-04-01 false Title I. 202.11 Section 202.11... INSTITUTIONS AND MORTGAGEES Title I and Title II Specific Requirements § 202.11 Title I. (a) Administrative... may be imposed under the Title I program. The administrative actions that may be applied are set forth...

  13. Developmental and reproductive toxicity of PVP/PEI-coated silver nanoparticles to zebrafish.

    Science.gov (United States)

    Orbea, Amaia; González-Soto, Nagore; Lacave, José María; Barrio, Irantzu; Cajaraville, Miren P

    2017-09-01

    Cellular and molecular mechanisms of toxicity of silver nanoparticles (NPs) and their toxicity to fish embryos after waterborne exposure have been widely investigated, but much less information is available regarding the effect of Ag NPs on physiological functions such as growth or reproduction. In this work, the effects of waterborne exposure of adult zebrafish (Danio rerio) to PVP/PEI coated Ag NPs (~5nm) on reproduction (fecundity) were investigated. Moreover, the development of the embryos after parental exposure was compared with the development of embryos after direct waterborne exposure to the NPs. For this, two experiments were run: 1) embryos from unexposed parents were treated for 5days with Ag NPs (10μgAgL -1 -10mgAgL -1 ) and development was monitored, and 2) selected breeding zebrafish were exposed for 3weeks to 100ngAgL -1 (environmentally relevant concentration) or to 10μgAgL -1 of Ag NPs, fecundity was scored and development of resulting embryos was monitored up to 5days. Waterborne exposure of embryos to Ag NPs resulted in being highly toxic (LC50 at 120h=50μgAgL -1 ), causing 100% mortality during the first 24h of exposure at 0.1mgAgL -1 . Exposure of adults, even at the environmentally relevant silver concentration, caused a significant reduction of fecundity by the second week of treatment and resulting embryos showed a higher prevalence of malformations than control embryos. Exposed adult females presented higher prevalence of vacuolization in the liver. These results show that Ag NPs at an environmentally relevant concentration are able to affect population level parameters in zebrafish. Copyright © 2017 Elsevier Inc. All rights reserved.

  14. The Behavioral Profile of methylenedioxypyrovalerone (MDPV) and α-pyrrolidinopentiophenone (PVP) - A Systematic Review.

    Science.gov (United States)

    Stanciu, Cornel N; Penders, Thomas M; Gnanasegaram, Samantha A; Pirapakaran, Elvin; Padda, Juvraj S; Padda, Jeeven S

    2017-03-21

    New psychoactive substances are emerging at an alarming rate. With novel structures and properties they produce unique behavioral characteristics during intoxication. Synthetic cathinones are some of the most common. More and more are presenting to emergency departments due to consequences of use. Aside from isolated reports, little is known about these compounds. Here we review literature pertaining to two common synthetic cathinones, MDPV and alphaPVP, and correlate clinically with guidance on management of intoxications. We searched the literature using predefined search terms for publications between January1985 and November2016. English language literature pertaining to humans only was considered. Returns were supplemented by citations of search returns, and credible online sources Results:Synthetic cathinones exert their action by blocking re-uptake of norepinephrine and dopamine, concentrating these in the synaptic cleft. Due to short duration of action, users re-dose frequently and compulsively leading to, and persisting into, delirium. Aside from disorganization, delusional thinking and hallucinations, some patients experience a more severe consequence- excited delirium. This is characterized by intense paranoia followed by very violent behavior often requiring physical interventions. Restraints are associated with increased mortality. Early recognition of the toxidrome allows for stress reduction and implementation of supportive care and sedation while avoiding dopaminergic agents. The trend of new molecules entering the market will continue and with it we will encounter more and more cases in our clinical practice. Standard drug testing is unlikely to confer much guidance. Clinicians must be aware of such presentations and be able to manage them accordingly, minimizing unwanted harm. Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.org.

  15. The antiproliferative function of violacein-like purple violet pigment (PVP) from an Antarctic Janthinobacterium sp. Ant5-2 in UV-induced 2237 fibrosarcoma

    Science.gov (United States)

    Mojib, Nazia; Nasti, Tahseen H.; Andersen, Dale T.; Attigada, Venkatram R.; Hoover, Richard B.; Yusuf, Nabiha; Bej, Asim K.

    2013-01-01

    Background In this study, we have investigated the chemotherapeutic potential of a purple violet pigment (PVP), which was isolated from a previously undescribed Antarctic Janthinobacterium sp. (Ant5-2), against murine UV-induced 2237 fibrosarcoma and B16F10 melanoma cells. Methods The 2237, B16F10, C50, and NIH3T3 cells were treated with PVP at different doses and for different times, and their proliferation and viability were detected by 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) assay. Cell cycle arrest induced by PVP in 2237 fibrosarcoma cells was assessed by flow cytometry and expression analysis of cell cycle regulatory proteins were done by Western blot. Apoptosis induced by PVP in 2237 cells was observed by annexin-V/propidium iodide double staining flow cytometry assay and fluorescence microscopy. To further determine the molecular mechanism of apoptosis induced by PVP, the changes in expression of Bcl-2, Bax and cytochrome c were detected by Western blot. The loss of mitochondrial membrane potential in PVP treated 2237 cells was assessed by staining with JC-1 dye following flow cytometry. Caspase-3, Caspase-9 and PARP cleavage were analyzed by Western blot and Caspase-3 and -9 activities were measured by colorimetric assays. Results In vitro treatment of murine 2237 cells with the PVP resulted in decreased cell viability (13–79%) in a time (24–72 h) and dose (0.1–1 μM)-dependent manner. The PVP-induced growth inhibition in 2237 cells was associated with both G0/G1 and G2/M phase arrest accompanied with decrease in the expression of cyclin dependent kinases (Cdks) and simultaneous increase in the expression of cyclin dependent kinase inhibitors (Cdki) – Cip1/p21 and Kip1/p27. Further, we observed a significant increase in the apoptosis of the 2237 fibrosarcoma cells which was associated with an increased expression of pro-apoptotic protein Bax, decreased expression of anti-apoptotic proteins Bcl-2, disruption of

  16. Title V Permitting Statistics Inventory

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Title V Permitting Statistics Inventory contains measured and estimated nationwide statistical data, consisting of counts of permitted sources, types of permits...

  17. Region 7 Title V facilities

    Data.gov (United States)

    U.S. Environmental Protection Agency — This web map shows the Region 7 Title V facilities (Clean Air Act major sources), any Class I areas within 300 km of R7 States, and any Tribal areas within 50 miles...

  18. PVP-coated silver nanoparticles and silver ions induce reactive oxygen species, apoptosis and necrosis in THP-1 monocytes

    DEFF Research Database (Denmark)

    Foldbjerg, Rasmus; Olesen, Ping Liu; Hougaard, Mads

    2009-01-01

    The objective of the present study was to investigate the toxicity of silver nanoparticles (Ag NPs) in vitro. Silver ions (Ag+) have been used in medical treatments for decades whereas Ag NPs have been used in a variety of consumer products within recent years. This study was undertaken to compare...... the effect of well characterized, PVP-coated Ag NPs (69 nm ± 3 nm) and Ag+ in a human monocytic cell line (THP-1). Characterization of the Ag NPs was conducted in both stock suspension and cell media with or without serum and antibiotics. By using the flowcytometric annexin V/propidium iodide (PI) assay...

  19. The entrapment of BaIb in PVP additives to form stable double active amorphous drug by hydrogen bonds

    Science.gov (United States)

    Safna Hussan K., P.; Thayyil, Mohamed Shahin; Deshpande, S. K.; Jinitha T., V.

    2017-05-01

    A stable amorphous drug with increased shelf life is synthesized by entrapping the double active pharmaceutical ingredient benzalkonium ibuprofenate (antibacterial as well as anti-inflammatory) in Polyvinyle pyrrollidone exceipient using stoichiometric metathesis reaction. The interaction between the drug and the additive were studied with the help of various experimental techniques. FTIR spectroscopy exposed the intermolecular hydrogen bonding between BaIb and PVP. The shelf life of the amorphous binary mixture is predicted with the help of continious XRD taken at regular interval of time. Molecular dynamics were studied with the help of BDS from deep glassy state in a wide frequency range revealed that it's a good fragile glass former.

  20. Optical properties of thin fibrous PVP/SiO2 composite mats prepared via the sol-gel and electrospinning methods

    Science.gov (United States)

    Tański, Tomasz; Matysiak, Wiktor; Krzemiński, Łukasz; Jarka, Paweł; Gołombek, Klaudiusz

    2017-12-01

    The aim of the research was to create thin, nanofibrous composite mats with a polyvinylpyrrolidone (PVP) matrix, with the reinforcing phase in the form of silicon oxide (SiO2) nanoparticles. SiO2 nanopowder was obtained using the zol-gel method with a mixture of tetraethyl orthosilicate (TEOS, Si (OC2H5)), hydrochloric acid (HCl), ethanol (C3H5OH) and distilled water. The produced colloidal suspension was subjected to a drying process and a calcination process at 550 °C, resulting in an amorphous silica nanopowder with an average particle diameter of 20 nm. The morphology and structure of the manufactured SiO2 nanoparticles was tested using transmission electron microscopy (TEM) and X-ray diffraction analysis (XRD). Then, using the electrospinning method with a 15% (weight) solution of PVP in ethanol and a 15% solution of PVP/EtOH containing the produced nanoparticles equivalent to 5% of the mass concentration relative to the polymer matrix, polymer PVP nanofibres and PVP/SiO2 composite nanofibres/SiO2 nanoparticles were produced. The morphology and chemical composition of the produced polymer and composite nanofibres were tested using a scanning electron microscope (SEM) with an energy dispersive spectrometer (EDS). The analysis of the impact of the reinforcing phase on the absorption of electromagnetic radiation was conducted on the basis of UV-vis spectra, based on which the rated values of band gaps of the produced thin fibrous mats were assessed.

  1. Using DVS-NIR to assess the water sorption behaviour and stability of a griseofulvin/PVP K30 solid dispersion.

    Science.gov (United States)

    Li, Wanjing; Buckton, Graham

    2015-11-30

    The purpose of this work was to investigate the distribution of water in a physically unstable amorphous solid dispersion (polyvinylpyrrolidone (PVP) and griseofulvin (as a model hydrophobic drug)), both as the sample absorbs water and during prolonged exposure to elevated humidity by use of dynamic vapour sorption combined with near infrared (DVS-NIR). The solid dispersion absorbed much less water than the sum of the water sorption of the individual components. This suggests that griseofulvin hindered PVP from absorbing water through the formation of the solid dispersion. Prolonged storage of the solid dispersion at 75% RH resulted in no significant mass change. Whilst this would usually be interpreted as the absence of crystallization, the NIR spectra demonstrated that crystallization occurred. The reason for the lack of a weight loss was that the expelled water from amorphous griseofulvin was sorbed by PVP, meaning that as the dispersion was broken by the crystallisation of griseofulvin, the PVP was once again free to sorb water (in line with the higher water sorption shown by PVP alone, and in contrast with the lower sorption of water by the solid dispersion). As water is a key factor in the physical stability of amorphous systems, understanding how and where water is absorbed and how this is liable to change is an important advance and offers promise in understanding the mechanism of stabilisation of solid dispersions, and therefore may be useful to predict the stability of new API dispersions. Copyright © 2015 Elsevier B.V. All rights reserved.

  2. Response surface method (RSM) for optimization of ionic conductivity of membranes polymer electrolyte poly (vinylidene fluoride) (PVDF) with polyvinyl pyrrolidone (PVP) as pore forming agent

    Science.gov (United States)

    Dyartanti, E. R.; Susanto, H.; Widiasa, I. N.; Purwanto, A.

    2017-06-01

    The Membranes Polymer Gel Electrolyte (MPGEs) based poly (vinylidene fluoride) (PVDF) was prepared by a phase inversion method using polyvinyl pyrrolidone (PVP) as a pore-forming agent and N, N-dimethyl acetamide (DMAc) as a solvent and water as non solvet. The membranes were then soaked in 1 M lithium hexafluorophosphate (LiPF6) in ethylene carbonate (EC) / dimethyl carbonate (DMC) / Diethyl carbonate (DEC) (4:2:4 %vol) solution in order to prepare polymer electrolyte membranes. The MPEGs PVDF/PVP/Nanoclay was applied using central composite design (CCD) experimental design to obtain a quantitative relationship between selected membranes prepared parameters namely (PVDF, PVP as pore forming agent and nanoclay filler concentration) and Ionic conductivity MPEGs. The model was used to find the optimum ionic conductivity from polymer electrolyte membranes. The polymer electrolyte membranes show good ionic conductivity on the order of 6.3 - 8.7 x 10-3 S cm-1 at the ambient temperatures. The ionic conductivity tended to increase with PVP and nanoclay concentration and decrease with PVDF composition. The model predicted the maximum ionic conductivity of 8.47 x 10-3 S cm-1 when the PVDF, PVP and nanoclay concentration were set at 8.01 %, 8.04 % and 10.12%, respectively. The first section in your paper.

  3. 48 CFR 252.217-7006 - Title.

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    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Title. 252.217-7006... Clauses 252.217-7006 Title. As prescribed in 217.7104(a), use the following clause: Title (DEC 1991) (a) Unless otherwise provided, title to all materials and equipment to be incorporated in a vessel in the...

  4. 48 CFR 245.7309-5 - Title.

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    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Title. 245.7309-5 Section... Title. (a) Unless otherwise specified in the Invitation, title to property sold under this Invitation... Contractor, title shall not vest until payment and loading are completed. (b) A Standard Form 97, Certificate...

  5. 7 CFR 3200.7 - Title.

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    2010-01-01

    ... 7 Agriculture 15 2010-01-01 2010-01-01 false Title. 3200.7 Section 3200.7 Agriculture Regulations... PERSONAL PROPERTY § 3200.7 Title. Title to excess personal property obtained under Part 3200 will... will give preference to the Federal agency that will retain title in the Government. ...

  6. 13 CFR 314.7 - Title.

    Science.gov (United States)

    2010-01-01

    ... 13 Business Credit and Assistance 1 2010-01-01 2010-01-01 false Title. 314.7 Section 314.7... Property § 314.7 Title. (a) General. The Recipient must hold title to the Real Property required for a... and must maintain title at all times during the Estimated Useful Life of the Project, except in those...

  7. 12 CFR 5.42 - Corporate title.

    Science.gov (United States)

    2010-01-01

    ... 12 Banks and Banking 1 2010-01-01 2010-01-01 false Corporate title. 5.42 Section 5.42 Banks and... CORPORATE ACTIVITIES Other Changes in Activities and Operations § 5.42 Corporate title. (a) Authority. 12 U... change its corporate title. (c) Standards. A national bank may change its corporate title provided that...

  8. 48 CFR 1352.271-80 - Title.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Title. 1352.271-80 Section... SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text of Provisions and Clauses 1352.271-80 Title. As prescribed in 48 CFR 1371.111, insert the following clause: Title (APR 2010) (a) Title to all materials and...

  9. 48 CFR 51.106 - Title.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 1 2010-10-01 2010-10-01 false Title. 51.106 Section 51... GOVERNMENT SOURCES BY CONTRACTORS Contractor Use of Government Supply Sources 51.106 Title. (a) Title to all... educational institutions and the Government Property clause at 52.245-1, Alternate II, is used, title to...

  10. 24 CFR 200.61 - Title.

    Science.gov (United States)

    2010-04-01

    ... 24 Housing and Urban Development 2 2010-04-01 2010-04-01 false Title. 200.61 Section 200.61... Requirements for Existing Projects General Requirements § 200.61 Title. (a) Marketable title to the project must be vested in the mortgagor as of the date the mortgage is filed for record. (b) Title evidence for...

  11. Study on characteristics of PVDF/nano-clay composite polymer electrolyte using PVP as pore-forming agent

    Energy Technology Data Exchange (ETDEWEB)

    Dyartanti, Endah R., E-mail: heru.susanto@undip.ac.id, E-mail: endah-rd@uns.ac.id [Departement of Chemical Engineering, Sebelas Maret University, Surakarta (Indonesia); Department of Chemical Engineering, Diponegoro University, Semarang (Indonesia); Purwanto, Agus [Departement of Chemical Engineering, Sebelas Maret University, Surakarta (Indonesia); Widiasa, I. Nyoman; Susanto, Heru, E-mail: heru.susanto@undip.ac.id, E-mail: endah-rd@uns.ac.id [Department of Chemical Engineering, Diponegoro University, Semarang (Indonesia)

    2016-02-08

    Polyvinylidene fluoride (PVDF) based polymer electrolytes have a high dielectric constant, which can assist in greater ionization of lithium salts. The main advantages of PVDF are its durability in long battery operation and its ability to be a good ion conductor. However, the limitation of this polymer is its crystalline molecular structure. Dispersing nano-particles in the polymer matrix may improve the characteristics of the PVDF polymer. This paper aims to investigate the impact of nano-clay addition on the characteristics of PVDF polymer to be used as a polymer electrolyte membrane. In addition, the effect of poly(vinyl pyrrolidone) (PVP) is also investigated. The membrane was prepared by phase separation method whereas the polymer electrolyte membranes was prepared by immersing into 1 M lithium hexafluorophosphate (LiPF{sub 6}) in ethylene carbonate/dimethyl carbonate (EC/DMC) electrolytes for 1 h. The membranes were characterized by scanning electron microscope (SEM), porosity and electrolyte uptake and performance in battery cell. The results showed that both nano-clay and PVP have significant impacts on the improvement of PVDF membranes to be used as polymer electrolyte.

  12. Facile Electrospinning Synthesis of Carbonized Polyvinylpyrrolidone (PVP)/g-C3 N4 Hybrid Films for Photoelectrochemical Applications.

    Science.gov (United States)

    Wang, Yan; Zhao, Xu; Tian, Yang; Wang, Yanbin; Jan, Abdul Khaliq; Chen, Yutong

    2017-01-05

    The film-forming ability and conductivity of graphitic carbon nitride (g-C3 N4 ) are still unsatisfying, despite much progress having been made in g-C3 N4 -related photocatalysts. New methods for synthesizing g-C3 N4 films coupled with excellent conductive materials are of significance. Herein, a facile method for synthesizing novel carbonized polyvinylpyrrolidone (PVP)/g-C3 N4 (CPVP /g-C3 N4 ) films have been developed through an electrospinning technique. Nanocarbons are generated by in situ carbonization of PVP in the films, which could enhance the photoelectrochemical (PEC) performance of the films due to its good conductivity. The coverage of the CPVP /g-C3 N4 film is good and the films exhibit excellent PEC performance. Furthermore, the thickness of the films can be adjusted by varying the electrospinning time and substantially controlling the PEC performance, of which the photocurrent densities under visible-light irradiation are 3.55, 4.92, and 6.64 μA cm(-2) with spinning times of 40, 70, and 120 min, respectively. The photocurrent does not decrease until testing at 4000 s and the coverage is still good after the tests, which indicates the good stability of the films. The excellent PEC performance of the films and facile preparation method enables promising applications in energy and environmental remediation areas. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

  13. In situ FTIR spectroscopic study of the effect of CO2 sorption on H-bonding in PEG-PVP mixtures.

    Science.gov (United States)

    Labuschagne, Philip W; Kazarian, Sergei G; Sadiku, Rotimi E

    2011-05-01

    A study of the H-bonding between poly(ethylene glycol) (PEG) and polyvinylpyrrolidone (PVP) in the presence of supercritical carbon dioxide at various temperatures, pressures, different M(w) of PEG and PVP and different PEG/PVP ratios is presented. In situ attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy was used to investigate H-bonding by examining changes in the relative intensities and positions of peak maxima of the 2nd derivative ν(C=O) bands associated with 'free' and H-bonded C=O groups. In general, relative intensities of bands associated with H-bonded CO groups decreased upon CO(2) sorption and was accompanied by an increase in intensity of bands associated with 'free' C=O groups. At the same time, these bands were shifted to higher wavenumbers. These shifts were attributed to the shielding effect of CO(2) molecules on H-bonding interactions between PEG and PVP. The magnitude of the effects of CO(2) shielding generally increased with decreasing polymer M(w) and increasing CO(2) content. However, upon CO(2) venting the extent of the H-bonding between PEG and PVP reappeared. The extent of H-bonding recovery was greatest for blends with low M(w) PEG (M(w): 4×10(2)) and PVP (M(w): 9×10(3)) and PEG content ≥0.54 wt% under mild conditions of pressure (80 bar) and temperature (35°C). For the same low M(w) blends, increasing pressure to 150 bar, or temperature to 50°C, showed poor H-bond recovery upon CO(2) venting. Overall, it was shown that supercritical CO(2)-induced shielding of H-bonding interactions in polymer blends is reversible upon CO(2) venting, and the magnitude of both was influenced by processing conditions and blend composition. Copyright © 2011 Elsevier B.V. All rights reserved.

  14. Study on plasma pre-functionalized PVC film grafted with TiO2/PVP to improve blood compatible and antibacterial properties

    Science.gov (United States)

    Suganya, Arjunan; Shanmugavelayutham, Gurusamy; Serra Rodríguez, Carmen

    2017-04-01

    Research into the design of new biopolymers/polymer functionalized with nanoparticles is of tremendous interest to the medical sector, particularly with regard to blood-contacting devices. In this present study, a steady blood compatible and active antibacterial coating was fabricated by the grafting of titanium dioxide (TiO2)/polyvinylpyyrolidone (PVP) onto a polyvinyl chloride (PVC) film surface via the direct-current glow discharge plasma method. To enhance the chemical interaction between TiO2/PVP and PVC, the surfaces of the PVC films were functionalized by different plasmas (air, argon, and oxygen) before coating. In this study, the plasma parameters were varied, such as treatment time of about 5-20 min for a constant power of 100 W, potential 300 V, and a constant gas pressure of 2 Pa for air, argon, and oxygen gas environment. Then, the different plasma treatments on the PVC films, TiO2/PVP were grafted using a simple dip-coating method. In addition, the TiO2/PVP-grafted PVC films were characterized by contact angle, attenuated total reflectance Fourier transform infrared spectroscopy, field-emission scanning electron microscope, and x-ray photo electron spectroscopy. Importantly, TiO2/PVP is grafted onto the PVC surface due to the plasma-based retained functionality and demonstrates adhesive efficiency, which was observed by XPS. The bio-stability of the TiO2/PVP-modified PVC film was evaluated by in vitro platelet activation analysis and protein adsorption analysis. Then, the antibacterial properties were evaluated by the agar diffusion method against Escherichia coli. The result reveals that the grafting of TiO2/PVP was slightly higher for the 15 min oxygen plasma-functionalized PVC, which significantly decreases the platelet adhesion and protein adsorption. Moreover, the antibacterial properties of the 15 min oxygen plasma-functionalized PVC with TiO2/PVP-grafted film is also greatly improved compared with an air- and argon-functionalized surface

  15. Transport of industrial PVP-stabilized silver nanoparticles in saturated quartz sand coated with Pseudomonas aeruginosa PAO1 biofilm of variable age.

    Science.gov (United States)

    Mitzel, Michael R; Tufenkji, Nathalie

    2014-01-01

    Understanding the environmental fate and transport of engineered nanoparticles (ENPs) is of paramount importance for the formation and validation of regulatory guidelines regarding these new and increasingly prevalent materials. The present study assessed the transport of an industrial formulation of poly(vinylpyrrolidone)-stabilized silver nanoparticle (PVP-nAg) in columns packed with water-saturated quartz sand and the same sand coated with Pseudomonas aeruginosa PAO1 biofilm of variable age (i.e., growth period). Physicochemical characterization studies indicate that the PVP-nAg is stable in suspension and exhibits little change in size or electrophoretic mobility with changing ionic strength (IS) in either NaNO3 or Ca(NO3)2. The collector surface had a relatively homogeneous biofilm coating, as determined by CLSM, and a near uniform distribution of biomass and biofilm thickness following column equilibration. Transport experiments in clean sand revealed changes in the particle deposition behavior only at and above 10 mM IS Ca(NO3)2 and showed no discernible change in PVP-nAg transport behavior in the presence of 1 to 100 mM NaNO3. Transport experiments in P. aeruginosa-coated sand indicated significantly reduced retention of PVP-nAg at low IS compared to clean sand, irrespective of biofilm age. Nanoparticle retention was also generally reduced in the biofilm-coated sand at the higher IS, but to a lesser extent. The decreased retention of PVP-nAg in biofilm-coated sand compared to clean sand is likely due to repulsive electrosteric forces between the PVP coatings and extracellular polymeric substances (EPS) of the biofilm. Additionally, the slope of the rising portion of the PVP-nAg breakthrough curve was noticeably steeper in biofilm conditions than in clean sand. More mature biofilm coating also resulted in earlier breakthrough of PVP-nAg compared to younger biofilm coatings, or to the clean sand, which may be an indication of the effect of repulsive surface

  16. Acid and base recovery from brine solution using PVP intermediate-based bipolar membrane through water splitting technology

    Science.gov (United States)

    Venugopal, Krishnaveni; Murugappan, Minnoli; Dharmalingam, Sangeetha

    2017-07-01

    Potable water has become a scarce resource in many countries. In fact, the world is not running out of water, but rather, the relatively fixed quantity is becoming too contaminated for many applications. Hence, the present work was designed to evaluate the desalination efficiency of resin and glass fiber-reinforced Polysulfone polymer-based monopolar and bipolar (BPM) ion exchange membranes (with polyvinyl pyrrolidone as the intermediate layer) on a real sample brine solution for 8 h duration. The prepared ion exchange membranes (IEMs) were characterized using FTIR, SEM, TGA, water absorption, and contact angle measurements. The BPM efficiency, electrical conductivity, salinity, sodium, and chloride ion concentration were evaluated for both prepared and commercial-based IEM systems. The current efficiency and energy consumption values obtained during BPMED process were found to be 45 % and 0.41 Wh for RPSu-PVP-based IEM system and 38 % and 1.60 Wh for PSDVB-based IEM system, respectively.

  17. Investigation of the degree of homogeneity and hydrogen bonding in PEG/PVP blends prepared in supercritical CO2: comparison with ethanol-cast blends and physical mixtures

    CSIR Research Space (South Africa)

    Labuschagne, Philip W

    2010-07-01

    Full Text Available The degree of homogeneity and H-bond interaction in blends of low-molecular-mass poly(ethylene glycols) (PEG, Mw = 400, 600, 1000) and poly(vinylpyrrolidone) (PVP, Mw =9×103) prepared in supercritical CO2, ethanol and as physical mixtures were...

  18. Influence of Polymer Molecular Weight on Drug-Polymer Solubility: A Comparison between Experimentally Determined Solubility in PVP and Prediction Derived from Solubility in Monomer.

    Science.gov (United States)

    Knopp, Matthias Manne; Olesen, Niels Erik; Holm, Per; Langguth, Peter; Holm, René; Rades, Thomas

    2015-09-01

    In this study, the influence of polymer molecular weight on drug-polymer solubility was investigated using binary systems containing indomethacin (IMC) and polyvinylpyrrolidone (PVP) of different molecular weights. The experimental solubility in PVP, measured using a differential scanning calorimetry annealing method, was compared with the solubility calculated from the solubility of the drug in the liquid analogue N-vinylpyrrolidone (NVP). The experimental solubility of IMC in the low-molecular-weight PVP K12 was not significantly different from that in the higher molecular weight PVPs (K25, K30, and K90). The calculated solubilities derived from the solubility in NVP (0.31-0.32 g/g) were found to be lower than those experimentally determined in PVP (0.38-0.40 g/g). Nevertheless, the similarity between the values indicates that the analogue solubility can provide valuable indications on the solubility in the polymer. Hence, if a drug is soluble in an analogue of the polymer, it is most likely also soluble in the polymer. In conclusion, the solubility of a given drug-polymer system is determined by the strength of the drug-polymer interactions rather than the molecular weight of the polymer. Therefore, during the first screenings for drug solubility in polymers, only one representative molecular weight per polymer is needed. © 2015 Wiley Periodicals, Inc. and the American Pharmacists Association.

  19. Microfluidic preparation of a highly active and stable catalyst by high performance of encapsulation of polyvinylpyrrolidone (PVP)-Pt nanoparticles in microcapsules.

    Science.gov (United States)

    Nam, Jin-Oh; Kim, Jongmin; Jin, Si Hyung; Chung, Young-Min; Lee, Chang-Soo

    2016-02-15

    The encapsulation of active metals in microcapsules would be highly advantageous in maintaining or improving the reaction performance of an array of widely used chemical reactions. However, conventional methods suffer from low uniformity, complicated fabrication steps, sintering, leaching, decline of catalytic activity, and/or poor reusability. Here, we report an efficient microfluidic approach to encapsulate Pt nanoparticle stabilized by polyvinylpyrrolidone (PVP) in photocurable double-emulsion droplets with semipermeable thin shells. The encapsulated catalysts are prepared by the in situ photopolymerization of a double emulsion. The rapid and exquisite microfluidics-based fabrication process successfully generates monodisperse microcapsules without loss of the PVP-Pt nanoparticles, which is the first demonstration of the microfluidic encapsulation of active metal with promising catalytic activity. Specifically, compared to quasi-homogeneous catalysis of PVP-Pt nanoparticles for 4-nitrophenol hydrogenation, the encapsulated PVP-Pt nanoparticles demonstrate excellent catalytic activity, a leaching-proof nature, and high reusability under the same reaction conditions. We envision that the approach described here may be an example of elegant catalyst design to efficiently overcome difficult problems in active-metal encapsulation and to dramatically enhance catalytic activity by taking advantage of the unique aspects of microfluidic methods. Copyright © 2015 Elsevier Inc. All rights reserved.

  20. Antimicrobial activity of PVP from an Antarctic bacterium, Janthinobacterium sp. Ant5-2, on multi-drug and methicillin resistant Staphylococcus aureus

    KAUST Repository

    Huang, Jonathan P.

    2012-04-11

    Multiple drug resistant (MDR) and methicillin-resistant Staphylococcus aureus (MRSA) have become increasingly prevalent as a community acquired infection. As a result limited treatment options are available with conventional synthetic antibiotics. Bioprospecting natural products with potent antimicrobial activity show promise for developing new drugs against this pathogen. In this study, we have investigated the antimicrobial activity of a purple violet pigment (PVP) from an Antarctic bacterium, Janthinobacterium sp. Ant5-2 on 15 clinical MDR and MRSA strains. The colorimetric resazurin assay was employed to determine the minimum inhibitory concentration (MIC90) of PVP against MDR and MRSA. The MIC90 ranged between 1.57 µg/mL and 3.13 µg/mL, which are significantly lower than many antimicrobials tested from natural sources against this pathogen. The spectrophotometrically determined growth analysis and total microscopic counts using Live/dead® BacLight™ fluorescent stain exhibited a steady decrease in viability of both MDR and MRSA cultures following treatment with PVP at the MIC levels. In silico predictive molecular docking study revealed that PVP could be a DNA-targeting minor groove binding antimicrobial compound. The continued development of novel antimicrobials derived from natural sources with the combination of a suite of conventional antibiotics could stem the rising pandemic of MDR and MRSA along with other deadly microbial pathogens.

  1. Spectroscopic Study of the Thermal Degradation of PVP-capped Rh and Pt Nanoparticles in H2 and O2 Environments

    Energy Technology Data Exchange (ETDEWEB)

    Borodko, Yuri; Lee, Hyun Sook; Joo, Sang Hoon; Zhang, Yawen; Somorjai, Gabor A.

    2009-09-15

    Poly(N-vinylpyrrolidone) (PVP) capped platinum and rhodium nanoparticles (7-12 nm) have been studied with UV-VIS, FTIR and Raman spectroscopy. The absorption bands in the region 190-900 nm are shown to be sensitive to the electronic structure of surface Rh and Pt atoms as well as to the aggregation of the nanoparticles. In-situ FTIR-DRIFT spectroscopy of the thermal decay of PVP stabilized Rh and Pt nanoparticles in H{sub 2} and O{sub 2} atmospheres in temperatures ranging from 30 C-350 C reveal that decomposition of PVP above 200 C, PVP transforms into a 'polyamidpolyene' - like material that is in turn converted into a thin layer of amorphous carbon above 300 C. Adsorbed carbon monoxide was used as a probing molecule to monitor changes of electronic structure of surface Rh and Pt atoms and accessible surface area. The behavior of surface Rh and Pt atoms with ligated CO and amide groups of pyrrolidones resemble that of surface coordination compounds.

  2. Kinetic and theoretical studies of novel biodegradable thermo-sensitive xerogels based on PEG/PVP/silica for sustained release of enrofloxacin

    Science.gov (United States)

    Ebadi, Azra; Rafati, Amir Abbas; Bavafa, Sadeghali; Mohammadi, Masoumah

    2017-12-01

    This study involves the synthesis of a new silica-based colloidal hybrid system. In this new hybrid system, poly (ethylene glycol) (PEG) and thermo-sensitive amphiphilic biocompatible poly (vinyl pyrrolidone) (PVP) were used to create suitable storage for hydrophobic drugs. The possibility of using variable PVP/PEG molar ratios to modulate drug release rate from silica nanoparticles was a primary goal of the current research. In addition, an investigation of the drug release kinetic was conducted. To achieve this, silica nanoparticles were synthesized in poly (ethylene glycol) (PEG) and poly (vinyl pyrrolidone) (PVP) solution incorporated with enrofloxacin (EFX) (as a model hydrophobic drug), using a simple synthetic strategy of hybrid materials which avoided waste and multi-step processes. The impacts of PVP/PEG molar ratios, temperature, and pH of the release medium on release kinetic were investigated. The physicochemical properties of the drug-loaded composites were studied by Fourier transform infrared (FT-IR) spectra, scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). In vitro drug release studies demonstrated that the drug release rate, which was evaluated by analyzing the experimental data with seven kinetic models in a primarily non-Fickian diffusion-controlled process, aligned well with both Ritger-Peppas and Sahlin-Peppas equations.

  3. In vitro Phase I and Phase II metabolism of α-pyrrolidinovalerophenone (α-PVP), methylenedioxypyrovalerone (MDPV) and methedrone by human liver microsomes and human liver cytosol.

    Science.gov (United States)

    Negreira, Noelia; Erratico, Claudio; Kosjek, Tina; van Nuijs, Alexander L N; Heath, Ester; Neels, Hugo; Covaci, Adrian

    2015-07-01

    The aim of the present study was to identify the in vitro Phase I and Phase II metabolites of three new psychoactive substances: α-pyrrolidinovalerophenone (α-PVP), methylenedioxypyrovalerone (MDPV), and methedrone, using human liver microsomes and human liver cytosol. Accurate-mass spectra of metabolites were obtained using liquid chromatography-quadrupole time-of-flight mass spectrometry. Six Phase I metabolites of α-PVP were identified, which were formed involving reduction, hydroxylation, and pyrrolidine ring opening reactions. The lactam compound was the major metabolite observed for α-PVP. Two glucuronidated metabolites of α-PVP, not reported in previous in vitro studies, were further identified. MDPV was transformed into 10 Phase I metabolites involving reduction, hydroxylation, and loss of the pyrrolidine ring. Also, six glucuronidated and two sulphated metabolites were detected. The major metabolite of MDPV was the catechol metabolite. Methedrone was transformed into five Phase I metabolites, involving N- and O-demethylation, hydroxylation, and reduction of the ketone group. Three metabolites of methedrone are reported for the first time. In addition, the contribution of individual human CYP enzymes in the formation of the detected metabolites was investigated.

  4. TITLE

    Directory of Open Access Journals (Sweden)

    Nisha K. M

    2016-01-01

    Full Text Available The new millennium is seen as an epoch of entrepreneurship with entrepreneurs perceiving novel opportunities, organizing resources, undertaking risks to pursue their goals in establishing innovative ventures for scaling new horizons. Women entrepreneurs have the potency to confront numerous challenges, such as creating equity, equilibrium, ensuring sustainable and inclusive socio economic development in divergent economies, by seizing tremendous business opportunities in the contemporary commercial world. Kerala, the southern State of India, is experiencing an economic renovation through technological transformation and, in particular, through the growth of women oriented Micro, Small and Medium Enterprises (MSMEs. The study aims to; identify the growth trends of women’s entrepreneurship in the micro enterprises of Kerala; examine whether women’s entrepreneurial activities significantly vary across the form of women owned enterprises, type of organization and nature of activity; and also explore the prospects and challenges faced by women entrepreneurs through micro entrepreneurial activities. Research methodology involves the application of descriptive quantitative analysis on the secondary data primarily collected from the database of Directorate of Industries and District Industries Centre for a period of 7 years extending from 2007-08 to 2013-14. Findings reveal that MSMEs spawn better income distribution, by operating in heterogeneous areas of the economy with limited capital and creating more employment opportunities, thereby reducing poverty and inequalities. The trend analysis reflects an escalation in the number of enterprises, investments, profits and employment opportunities generated especially through micro enterprises of women. They play a crucial role in the economy in terms of creating self employment and generating employment opportunities for others. A paradigm shift is seen in the role of women’s entrepreneurship in terms of innovation, attitudes, leadership qualities, competitiveness, entrepreneurial skill and absorbing new entrants to the job market, empowering marginalized women.

  5. Avoiding Title V permitting pitfalls

    Energy Technology Data Exchange (ETDEWEB)

    Laswell, D.L.

    1993-04-01

    Title V of the 1990 Clean Air Act Amendments requires states to implement new air operating permit programs. States have a great deal of flexibility in developing their permit programs. Industry should work now to ensure that state programs contain the favorable aspects of the federal regulations and do not contain more stringent requirements that are not required under the Clean Air Act. This article outlines areas of the permit program that have the potential to handicap industry`s ability to expand.

  6. Nanostructurization effects in PVP-stabilized tetra-arsenic tetra-sulfide As{sub 4}S{sub 4} nanocomposites

    Energy Technology Data Exchange (ETDEWEB)

    Shpotyuk, O., E-mail: olehshpotyuk@yahoo.com [Institute of Physics of Jan Dlugosz University in Czestochowa, 13/15, Al. Armii Krajowej, Czestochowa, 42200 (Poland); Vlokh Institute of Physical Optics, 23, Dragomanov Str., Lviv, 79005 (Ukraine); Scientific Research Company “Carat”, 202, Stryjska Str., 79031, Lviv (Ukraine); Bujňáková, Z.; Baláž, P. [Institute of Geotechnics of Slovak Academy of Sciences, 45, Watsonova Str., Košice, 04001 (Slovakia); Ingram, A. [Opole University of Technology, 75, Ozimska Str., Opole, 45370 (Poland); Demchenko, P. [Ivan Franko National University of Lviv, 1, Universytetska Str., 79000 Lviv (Ukraine); Kovalskiy, A. [Department of Physics & Astronomy, Austin Peay State University, Clarksville, TN, 37044 (United States); Vlcek, M. [Department of General and Inorganic Chemistry, Faculty of Chemistry, University of Pardubice, 532 10, Pardubice (Czech Republic); Shpotyuk, Ya. [Ivan Franko National University of Lviv, 1, Universytetska Str., 79000 Lviv (Ukraine); Centre for Innovation and Transfer of Natural Sciences and Engineering Knowledge, 1, Pigonia Str., 35310, Rzeszow (Poland); Cebulski, J.; Dziedzic, A. [Centre for Innovation and Transfer of Natural Sciences and Engineering Knowledge, 1, Pigonia Str., 35310, Rzeszow (Poland)

    2017-01-15

    Nanostructurization in three types of tetra-arsenic tetra-sulfide As{sub 4}S{sub 4} polymorphs composed by (1) preferential β-As{sub 4}S{sub 4}, (2) realgar α-As{sub 4}S{sub 4} and (3) admixture of As{sub 4}S{sub 4} in the form of β-realgar, pararealgar and intermediate χ-phase subjected to mechanochemical ball milling in a water solution of polyvinylpyrrolidone (PVP) are characterized with multiexperimental structure-sensitive probes. Void structure of pelletized As{sub 4}S{sub 4}-PVP nanocomposites is probed by positron annihilation lifetime spectroscopy complemented with atomic-sensitive techniques such as X-ray powder diffraction, Raman scattering and scanning electron microscopy with energy-dispersive X-ray spectroscopy. Appearance of arsenolite As{sub 2}O{sub 3} crystallites is character for all As{sub 4}S{sub 4} polymorphs affected by wet milling. Positron annihilation lifetime data considered in terms of substitution positron-positronium trapping confirm complicated nature of nanocomposites. Modified x3-x2-coupling decomposition algorithm developed in addition to unconstrained x3-term fitting procedure is applied to parameterize annihilation channels in these nanocomposites. Interfacial free-volume voids between neighboring nanoparticles in PVP environment are defined as most favorable trapping sites, they being rather loosely composed by As{sub 4}S{sub 4} crystallites in full respect to variety of crystallographic polymorphs used for milling. Detected annihilation channels are ascribed preferentially to intrinsic free-volume voids insensitive to trapping states at the surface of oxidized nanocomposites. - Highlights: • PVP-stabilized tetra-arsenic tetra-sulfide nanocomposites prepared by wet milling. • As{sub 4}S{sub 4}-PVP composites by complementary atomic-specific and deficient structure probes. • Surface oxidation due to crystalline arsenolite As{sub 2}O{sub 3} under wet milling. • Free-volume structure of PVP-stabilized As{sub 4}S{sub 4

  7. 48 CFR 1832.1009 - Title.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 6 2010-10-01 2010-10-01 true Title. 1832.1009 Section... CONTRACTING REQUIREMENTS CONTRACT FINANCING Performance-Based Payments 1832.1009 Title. In accordance with 42 U.S.C. 2465d, NASA shall not take title to launch vehicles under contracts for launch services...

  8. 12 CFR 543.1 - Corporate title.

    Science.gov (United States)

    2010-01-01

    ... 12 Banks and Banking 5 2010-01-01 2010-01-01 false Corporate title. 543.1 Section 543.1 Banks and...-INCORPORATION, ORGANIZATION, AND CONVERSION § 543.1 Corporate title. (a) General. A Federal savings association shall not adopt a title that misrepresents the nature of the institution or the services it offers. (b...

  9. 48 CFR 1371.111 - Title.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Title. 1371.111 Section... REGULATIONS ACQUISITIONS INVOLVING SHIP CONSTRUCTION AND SHIP REPAIR Provisions and Clauses 1371.111 Title. Insert clause 1352.271-80, Title, in all solicitations and contracts for ship repair. ...

  10. 48 CFR 1252.217-77 - Title.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Title. 1252.217-77 Section... SOLICITATION PROVISIONS AND CONTRACT CLAUSES Text of Provisions and Clauses 1252.217-77 Title. As prescribed at (TAR) 48 CFR 1217.7001(b) and (c), insert the following clause: Title (OCT 1994) (a) Unless otherwise...

  11. 48 CFR 32.1009 - Title.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 1 2010-10-01 2010-10-01 false Title. 32.1009 Section 32... REQUIREMENTS CONTRACT FINANCING Performance-Based Payments 32.1009 Title. (a) Since the clause at 52.232-32, Performance-Based Payments, gives the Government title to the property described in paragraph (f) of the...

  12. 7 CFR 2812.6 - Title.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 15 2010-01-01 2010-01-01 false Title. 2812.6 Section 2812.6 Agriculture Regulations of the Department of Agriculture (Continued) OFFICE OF OPERATIONS, DEPARTMENT OF AGRICULTURE...) § 2812.6 Title. Title to excess personal property/equipment donated under this Part will automatically...

  13. 45 CFR 1309.20 - Title.

    Science.gov (United States)

    2010-10-01

    ... 45 Public Welfare 4 2010-10-01 2010-10-01 false Title. 1309.20 Section 1309.20 Public Welfare Regulations Relating to Public Welfare (Continued) OFFICE OF HUMAN DEVELOPMENT SERVICES, DEPARTMENT OF HEALTH... FACILITIES PURCHASE, MAJOR RENOVATION AND CONSTRUCTION Protection of Federal Interest § 1309.20 Title. Title...

  14. The formation of α-phase SnS nanorods by PVP assisted polyol synthesis: Phase stability, micro structure, thermal stability and defects induced energy band transitions

    Energy Technology Data Exchange (ETDEWEB)

    Baby, Benjamin Hudson; Mohan, D. Bharathi, E-mail: d.bharathimohan@gmail.com

    2017-05-01

    We report the formation of single phase of SnS nanostructure through PVP assisted polyol synthesis by varying the source concentration ratio (Sn:S) from 1:1M to 1:12M. The effect of PVP concentration and reaction medium towards the preparation of SnS nanostructure is systematically studied through confocal Raman spectrometer, X-ray diffraction, thermogravimetry analysis, scanning electron microscope, transmission electron microscopy, X-ray photoelectron spectroscopy, UV–Vis–NIR absorption and fluorescence spectrophotometers. The surface morphology of SnS nanostructure changes from nanorods to spherical shape with increasing PVP concentration from 0.15M to 0.5M. Raman analysis corroborates that Raman active modes of different phases of Sn-S are highly active when Raman excitation energy is slightly greater than the energy band gap of the material. The presence of intrinsic defects and large number of grain boundaries resulted in an improved thermal stability of 20 °C during the phase transition of α-SnS. Band gap calculation from tauc plot showed the direct band gap of 1.5 eV which is attributed to the single phase of SnS, could directly meet the requirement of an absorber layer in thin film solar cells. Finally, we proposed an energy band diagram for as synthesized single phase SnS nanostructure based on the experimental results obtained from optical studies showing the energy transitions attributed to band edge transition and also due to the presence of intrinsic defects. - Highlights: • PVP stabilizes the orthorhombic (α) phase of SnS. • Optical band gap of P type SnS tuned by PVP for photovoltaic applications. • The formation of Sn rich SnS phase is investigated through XPS analysis. • Intrinsic defects enhance the thermal stability of α-SnS. • The feasibility of energy transition liable to point defects is discussed.

  15. Effect of PVP on the characteristic of modified membranes made from waste PET bottles for humic acid removal [version 2; referees: 2 approved

    Directory of Open Access Journals (Sweden)

    Nasrul Arahman

    2017-06-01

    Full Text Available Background: The aim of the present study was to evaluate the possibility of using recycled polymer (waste polyethylene terephthalate [PET] bottles as a membrane material. Furthermore, the effect of the addition of a pore-forming agent and preparation conditions was also observed. Methods: Porous polymeric membranes were prepared via thermally induced phase separation by dissolving recycled PET in phenol. PET polymer was obtained from waste plastic bottles as a new source of polymeric material. For original PET membrane, the casting solution was prepared by dissolving of 20wt% PET in phenol solution. For PET modified membrane, a 5 wt% of polyvinylpyrrolidone (PVP was added into polymer solution. The solution was cast onto a glass plate at room temperature followed by evaporation before the solidification process. The membranes formed were characterized in terms of morphology, chemical group, and filtration performance. A humic acid solution was used to identify the permeability and the solute rejection of the membranes. Results: The results showed that the recycled PET from waste plastic bottles was applicable to use as a membrane material for a water treatment process. The maximum flux of 97.0 l/m2.hr was obtained from filtration test using PET membrane. The highest rejection of humic acid in a water sample, which reached up to 75.92%, was obtained using the PET/PVP membrane. Conclusions: The recycled PET from waste bottles was successfully used to prepare porous membrane. The membrane was modified by the addition of PVP as a membrane modifying agent. SEM analysis confirmed that the original PET membrane has a rough and large pore structure. The addition of PVP improved the pore density with a narrow pore structure. The PET/PVP membrane conditioned with evaporation was the best in humic acid rejection.

  16. The effect of minimal concentration of ethylene glycol (EG) combined with polyvinylpyrrolidone (PVP) on mouse oocyte survival and subsequent embryonic development following vitrification.

    Science.gov (United States)

    Wang, Yao; Okitsu, Osamu; Zhao, Xiao-Ming; Sun, Yun; Di, Wen; Chian, Ri-Cheng

    2014-01-01

    Vitrification techniques employ a relatively high concentration of cryoprotectant in vitrification solutions. Exposure of oocytes to high concentrations of cryoprotectant is known to damage the oocytes via both cytotoxic and osmotic effects. Therefore, the key to successful vitrification of oocytes is to strike a balance between the usage of minimal concentration of cryoprotectant without compromising their cryoprotective actions. The minimal concentration of ethylene glycol (EG) on mouse oocyte survival and subsequent embryonic development was evaluated following vitrification-warming and parthenogenetic activation. Polyvinylpyrrolidone (PVP) combined with EG on mouse oocyte survival and subsequent embryonic development as well as morphology of the spindle and chromosome alignment were also evaluated. Vitrification system was adapted with JY Straw and the cooling rate was approximately 442-500 °C/min. In contrast, the warming rate was approximately 2,210-2,652 °C/min. Survival rate of oocytes increased significantly when 15 % EG was combined with 2 % PVP in vitrification solution (VS). The effect of combination of EG and PVP was not significant when the concentration of EG was 20 % and higher. Although there were no significant differences in embryonic development, the percentage of abnormal spindle and chromosome alignment was significantly higher in the oocytes without 2 % PVP in VS. Our data provide a proof of principle for oocyte vitrification that may not require a high concentration of cryoprotectant. There are synergic effects of EG combined with PVP for oocyte vitrification, which may provide important information to the field in developing less cytotoxic VS.

  17. 42 CFR 476.86 - Correlation of Title XI functions with Title XVIII functions.

    Science.gov (United States)

    2010-10-01

    ... 42 Public Health 4 2010-10-01 2010-10-01 false Correlation of Title XI functions with Title XVIII functions. 476.86 Section 476.86 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF...) Qio Review Functions § 476.86 Correlation of Title XI functions with Title XVIII functions. (a...

  18. The byzantine title of Constantine Bodin

    Directory of Open Access Journals (Sweden)

    Komatina Predrag

    2011-01-01

    Full Text Available The paper considers the use of the title exousiastes on the newly discovered seal of Constantine Bodin. It analyses the meaning and use of this title in the sources of a diplomatic character of the 10th century, as well as its use in the 11th century sources. The question is posed why this title was used on Bodin’s seal instead of the title archon, which had been used for former Serbian rulers, as well as whether this phenomenon had any connection to the fact that Serbian rulers, beginning at the end of the rule of Bodin’s father Michael, used the title of king.

  19. Extraction of human DNA for PCR from chewed residues of betel quid using a novel "PVP/CTAB" method.

    Science.gov (United States)

    Chiou, F S; Pai, C Y; Hsu, Y P; Tsai, C W; Yang, C H

    2001-09-01

    Residues of chewed betel quid (BQ) are often found on crime scenes in Taiwan and possibly some of the Southeast Asian countries. Although these residues are important biological evidences relating to the suspects, the forensic analysis of BQ evidence has been hindered by failures in extraction of human DNA for PCR analysis. Therefore, it is a prerequisite for relevant forensic casework to establish a reliable method for extracting DNA from chewed BQ residues. Three conventional methods (salt/chloroform, 5% Chelex-100 resin, and QIAamp) were first tested for extraction of human DNA from 33 mock BQ samples, which had been stored for less than two months, and 50 four-year-old forensic BQ samples. PCR amplifications from the HLA-DQA1&PM and the STR loci were then used to test the quality of the extracted DNA. For the mock samples, three observations were made. First, PCR amplification of DNA extracted by using these conventional methods had low success rate. Second, the addition of extra Taq DNA polymerase could compensate the lost enzyme activities due to putative inhibitors and, thus, increase the yield. Third, using the Centricon-100 column to remove putative inhibitors substantially improved the efficiency of PCR. However, for the four-year-old forensic BQ samples, none of the attempts for PCR were successful. In order to solve the problem in PCR analysis of DNA from old BQ samples, we developed a DNA extraction method based on the use of polyvinyl pyrrolidone (PVP) and cetyltrimethylammonium bromide (CTAB), which bind to two common classes of PCR inhibitors in plants, polyphenols, and polysaccharides, respectively. The result showed that this "PVP/CTAB" method is completely successful for the mock BQ samples, and 92% (46 out of 50) successful for the four-year-old forensic BQ samples. To our best knowledge, this is the first report of a reliable method for the extraction of human DNA for PCR from chewed BQ residues. This method should provide a useful means for

  20. Susceptibility to malignant hyperthermia

    NARCIS (Netherlands)

    Snoeck, Marcus Matheus Johannes

    2004-01-01

    In this thesis the author studied the diagnostic procedures for susceptibility to malignant hyperthermia (MH), with special emphasis upon refining the biological diagnostic test and improving protocols and guidelines for investigation of MH susceptibility. MH is a pharmacogenetic disease of skeletal

  1. Land Titles and Rice Production in Vietnam

    DEFF Research Database (Denmark)

    Van Den Broeck, Katleen; Newman, Carol; Tarp, Finn

    In most of the empirical literature on land titling, the household is regarded as unitary, and land rights are found to have ambiguous effects on land allocation, investment and productivity. Using data from 12 provinces in Vietnam, we diversify land titles, and show in a household fixed effects...... analysis of plot level rice yields that land titles are indeed important. Only exclusively held titles have the expected positive effects, and the positive effect on yields is found in male headed households. Furthermore, a household level rice yield function reveals that exclusive user rights...... are inefficiency decreasing, while jointly held user rights have no efficiency effects. Finally, once the gender of the head of household is controlled for, exclusively held female titles have a greater positive effect on the efficiency of the household than that of male held titles....

  2. MEDLARS Abbreviations for Medical Journal Titles

    Science.gov (United States)

    Charen, Thelma; Gillespie, Constantine J.

    1971-01-01

    The National Library of Medicine announces its adoption of the Anglo-American standard for the formulation of journal title abbreviations according to the American National Standard for the Abbreviation of Titles of Periodicals (1969), with individual words abbreviated, in turn, according to the International List of Periodical Title Word Abbreviations (1970). The history of the activity of the specific Z39 Committee of USASI (now ANSI) concerned with journal title abbreviations is reviewed, covering the period from 1962 to the present. A history of the National Clearinghouse for Periodical Title Word Abbreviations and of the International List is also given. Former NLM usage is compared with the forms of the present International List and examples show the major changes in NLM abbreviations. The NLM Rules for Abbreviation of Periodical Titles as derived from the new standard are appended. PMID:5146764

  3. The Effect of PEI and PVP-Stabilized Gold Nanoparticles on Equine Platelets Activation: Potential Application in Equine Regenerative Medicine

    Directory of Open Access Journals (Sweden)

    Mateusz Hecold

    2017-01-01

    Full Text Available The aim of this work was to assess the effect of different stabilizing agents, for example, polyethylenimine (PEI and polyvinylpyrrolidone (PVP, on gold nanoparticles (AuNPs and their influence on equine platelet activation and release of particular growth factors. The gold nanoparticles were produced by chemical reduction of chloroauric acid. UV-Vis spectroscopy confirmed the presence of gold nanoparticles in investigated solutions. The AuNPs were incubated with whole blood at various concentrations. The morphology of platelets in PRP prepared from the blood incubated with AuNPs was characterized by scanning transmission electron microscopy, whereas the concentrations of growth factors and cytokines were evaluated by ELISA assays. The most promising results were obtained with equine platelets incubated with 5% AuNPs stabilized by PEI, which lead to secretion of bone morphogenetic protein 2 (BMP-2, vascular endothelial growth factor (VEGF, and fibroblast growth factor 1 (FGF-1 and simultaneously cause decrease in concentration of interleukin-1 alpha (IL-1α. The qRT-PCR confirmed ELISA test results. The incubation with 5% AuNPs stabilized by PEI leads to upregulation of BMP-2 and VEGF transcripts of mRNA level and to downregulating expression of interleukin-6 (IL-6. Obtained data shed a promising light on gold nanoparticle application for future regenerative medicine application.

  4. Synthesis, characterization and photocatalytic activity of PVP stabilized ZnO and modified ZnO nanostructures

    Science.gov (United States)

    Bandekar, Gauri; Rajurkar, N. S.; Mulla, I. S.; Mulik, U. P.; Amalnerkar, D. P.; Adhyapak, P. V.

    2013-01-01

    In the present study, ZnO nanostructures have been successfully synthesized by hydrothermal, sonochemical and precipitation methods using polyvinyl pyrrolidone (PVP) as the capping agent. The ZnO nanoparticles were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV-Visible spectroscopy and photoluminescence (PL) techniques. The XRD results revealed the hexagonal wurtzite structure of the ZnO nanostructures for all the samples. Furthermore, the morphology of the ZnO particles was obtained from FESEM micrographs. Particles prepared by hydrothermal method were found to be rice grain shaped and that prepared by precipitation and sonochemical methods were spherical shaped. Sunlight driven photocatalytic degradation of methylene blue (MB) was studied for ZnO nanostructures synthesized by various methods. The ZnO nanostructures were further decorated with Ag nanoparticles to enhance its dye degradation efficiency. The Ag decorated ZnO nanoparticles exhibited a higher degradation rate as compared to pure ZnO nanoparticles which was independent of pH. Since this process of dye degradation relies on the degradation of dye due to oxidation by highly reactive hydroxyl radicals, there are many factors which affect the efficiency of this process. Hence a study was conducted on the effect of various parameters on ZnO viz amount of catalyst, reaction pH and concentration of MB dye.

  5. Real-Time Characterization of Electrospun PVP Nanofibers as Sensitive Layer of a Surface Acoustic Wave Device for Gas Detection

    Directory of Open Access Journals (Sweden)

    D. Matatagui

    2014-01-01

    Full Text Available The goal of this work has been to study the polyvinylpyrrolidone (PVP fibers deposited by means of the electrospinning technique for using as sensitive layer in surface acoustic wave (SAW sensors to detect volatile organic compounds (VOCs. The electrospinning process of the fibers has been monitored and RF characterized in real time, and it has been shown that the diameters of the fibers depend mainly on two variables: the applied voltage and the distance between the needle and the collector, since all the electrospun fibers have been characterized by a scanning electron microscopy (SEM. Real-time measurement during the fiber coating process has shown that the depth of penetration of mechanical perturbation in the fiber layer has a limit. It has been demonstrated that once this saturation has been reached, the increase of the thickness of the fibers coating does not improve the sensitivity of the sensor. Finally, the parameters used to deposit the electrospun fibers of smaller diameters have been used to deposit fibers on a SAW device to obtain a sensor to measure different concentrations of toluene at room temperature. The present sensor exhibited excellent sensitivity, good linearity and repeatability, and high and fast response to toluene at room temperature.

  6. Microwave-assisted polyol synthesis and characterization of pvp-capped cds nanoparticles for the photocatalytic degradation of tartrazine

    Energy Technology Data Exchange (ETDEWEB)

    Darwish, Maher, E-mail: m-darwish@razi.tums.ac.ir [Department of Drug and Food Control, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of); Mohammadi, Ali, E-mail: alimohammadi@tums.ac.ir [Department of Drug and Food Control, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of); Nanotechnology Research Centre, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of); Assi, Navid, E-mail: navid_a30@yahoo.com [Department of Drug and Food Control, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of)

    2016-02-15

    Highlights: • PVP-stabilized CdS nanoparticles have been fabricated by a polyol-microwave method. • CdS nanoparticles were characterized and the size was approximately 48 ± 10 nm. • Catalytic activity of our nanoparticles was examined for tartrazine degradation. • Remarkable results were obtained under both UV and visible light irradiations. - Abstract: Polyvinylpyrrolidone capped cadmium sulfide nanoparticles have been successfully synthesized by a facile polyol method with ethylene glycol. Microwave irradiation and calcination were used to control the size and shape of nanoparticles. Characterization with scanning electron microscopy revealed a restricted nanoparticles growth comparing with the uncapped product, hexagonal phase and 48 nm average particle size were confirmed by X-ray diffraction, and finally mechanism of passivation was suggested depending on Fourier transform infrared spectra. The efficiency of nanoparticles was evaluated by the photocatalytic degradation of tartrazine in aqueous solution under UVC and visible light irradiation. Complete degradation of the dye was observed after 90 min of UVC irradiation under optimized conditions. Kinetic of reaction fitted well to the pseudo-first-order kinetic and Langmuir–Hinshelwood models. Furthermore, 85% degradation of the dye in 9 h under visible light suggests that cadmium sulfide is a promising tool to work under visible light for environmental remediation.

  7. Synthesis and characterization of LiFePo4/C cathode material by freeze drying method with PVP

    Directory of Open Access Journals (Sweden)

    Kuzmanović Maja D.

    2014-01-01

    Full Text Available Lithium iron phosphate is a promising cathode material for lithium ion battery application thanks to its good characteristics. Here is presented the freeze drying method for the preparation of carbon coated LiFePO4, where PVP is used as a carbon source. The main advantage of this method is mixing at the atomic level and introducing the carbon source into the precursor solution. The synthesis process can be divided into three stages: freezing of a precursor solution, drying under vacuum until water evaporates and calicination of as-dried powder at slightly reductive atmosphere. Powder X-ray diffraction measurement demonstrated single phase LiFePO4 with crystallite size of 45.8 nm. Morphology and particle size was revealed with scanning electron microscopy and particle size analyzer. Galvanostatic cycling from 2.3 to 4.1 V vs. Li/Li+, shows typical LiFePO4 redox behavior with plateau at 3.4 V. The discharge capacity value obtained at C/10 rate was 154 mAh- 1, with decrease on greater C-rates.

  8. Laser Raman, XRD, DSC and Ac-Impedance Analysis of Polymer Blend Electrolyte Based on Eco-Friendly Pva-Pvp Blend with NH4NO3

    Science.gov (United States)

    Rajeswari, N.; Selvasekarapandian, S.; Prabaharan, S. R. S.; Kawamura, J.; Iwai, Y.; Karthikeyan, S.

    2013-07-01

    Proton conducting polymer blend electrolytes have attractive interest because of their advantages such as processability, flexibility, electrochemical stability, easy handling and their applications to a variety of electrochemical devices such as fuel cells, chemical sensor and electrochemical displays. In the present work, the films of 50PVA-50PVP blend with different MWt% concentrations of NH4NO3 have been prepared by solution casting techniques using distilled water as a solvent. The prepared films have been investigated by different techniques such as XRD, DSC, Laser Raman and AC Impedance spectroscopy. XRD studies reveal the amorphous nature of the polymer blend-salt complexes. The glass transition temperature has been calculated from the DSC analysis. From the AC Impedance spectroscopy, the high conductivity of the 30MWt% of NH4NO3 doped 50PVA-50PVP polymer complex has been found to be the order of 1.41 × 10-3S cm-1 at room temperature.

  9. Preparation of Aligned Ultra-long and Diameter-controlled Silicon Oxide Nanotubes by Plasma Enhanced Chemical Vapor Deposition Using Electrospun PVP Nanofiber Template

    Directory of Open Access Journals (Sweden)

    Zhou Ming

    2009-01-01

    Full Text Available Abstract Well-aligned and suspended polyvinyl pyrrolidone (PVP nanofibers with 8 mm in length were obtained by electrospinning. Using the aligned suspended PVP nanofibers array as template, aligned ultra-long silicon oxide (SiOx nanotubes with very high aspect ratios have been prepared by plasma-enhanced chemical vapor deposition (PECVD process. The inner diameter (20–200 nm and wall thickness (12–90 nm of tubes were controlled, respectively, by baking the electrospun nanofibers and by coating time without sacrificing the orientation degree and the length of arrays. The micro-PL spectrum of SiOx nanotubes shows a strong blue–green emission with a peak at about 514 nm accompanied by two shoulders around 415 and 624 nm. The blue–green emission is caused by the defects in the nanotubes.

  10. Modulatory effects of Zn2+ ions on the toxicity of citrate- and PVP-capped gold nanoparticles towards freshwater algae, Scenedesmus obliquus.

    Science.gov (United States)

    Iswarya, V; Johnson, J B; Parashar, Abhinav; Pulimi, Mrudula; Chandrasekaran, N; Mukherjee, Amitava

    2017-02-01

    Gold nanoparticles (GNPs) are widely used for medical purposes, both in diagnostics as well as drug delivery, and hence are prone to release and distribution in the environment. Thus, we have explored the effects of GNPs with two distinct surface capping (citrate and PVP), and three different sizes (16, 27, and 37 nm) at 0.01-, 0.1-, and 1-mg L-1 concentrations on a predominant freshwater alga Scenedesmus obliquus in the sterile freshwater matrix. We have also investigated how an abundant metal ion from freshwater, i.e., Zn2+ ions may modulate the effects of the selected GNPs (40 nm, citrate, and PVP capped). Preliminary toxicity results revealed that gold nanoparticles were highly toxic in comparison to zinc ions alone. A significant modulation in the toxicity of Zn ions was not noticed in the presence of GNPs. In contrast, zinc ions minimized the toxicity produced by GNPs (both CIT-37 and PVP-37), despite its individual toxicity. Approximately, about 42, 33, and 25% toxicity reduction was noted at 0.05-, 0.5-, and 5-mg L-1 Zn ions, respectively, for CIT-37 GNPs, while 31% (0.05 mg L-1), 24% (0.5 mg L-1), and 9% (5 mg L-1) of toxicity reduction were noted for PVP-37 GNPs. Maximum toxicity reduction was seen at 0.05 mg L-1 of Zn ions. Abbott modeling substantiated antagonistic effects offered by Zn2+ ions on GNPs. Stability and sedimentation data revealed that the addition of zinc ions gradually induced the aggregation of NPs and in turn significantly reduced the toxicity of GNPs. Thus, the naturally existing ions like Zn2+ have an ability to modulate the toxicity of GNPs in a real-world environment scenario.

  11. Ships Docked at Title V Permitted Facilities

    Science.gov (United States)

    This document may be of assistance in applying the Title V air operating permit regulations. This document is part of the Title V Policy and Guidance Database available at www2.epa.gov/title-v-operating-permits/title-v-operating-permit-policy-and-guidance-document-index. Some documents in the database are a scanned or retyped version of a paper photocopy of the original. Although we have taken considerable effort to quality assure the documents, some may contain typographical errors. Contact the office that issued the document if you need a copy of the original.

  12. The effect of water-soluble polymers, PEG and PVP, on the solubilisation of griseofulvin in aqueous micellar solutions of Pluronic F127.

    Science.gov (United States)

    Oliveira, Cristiane P; Ribeiro, Maria Elenir N P; Ricardo, Nágila M P S; Souza, Ticiane V de P; Moura, Carolina Lima; Chaibundit, Chiraphon; Yeates, Stephen G; Nixon, Keith; Attwood, David

    2011-12-15

    The purpose of this study was to investigate the possibility of enhancing the solubilisation capacity of micellar solutions of Pluronic F127 for the poorly water-soluble drug griseofulvin by co-formulating with a water-soluble polymer. The effect of the addition of the polyethylene glycols PEG6000 and 35000, and the poly(vinylpyrrolidone)s PVP K30 and K90, on the solubilisation capacity of 1wt% solutions of Pluronic F127 was related to the effect of these additives on particle size as determined by dynamic light scattering measurements. The addition of PEG35000 to 1wt% F127 solutions significantly increased the solubility capacity expressed in terms of unit weight of F127; PVP K90 had a smaller effect but no enhancement was noted following the addition of PEG6000 or PVP K30. Solubilisation enhancement was thought to be a consequence of the association of the polymers with the E-blocks of the micelle corona so providing an expanded region of reduced polarity for drug solubilisation. Copyright © 2011 Elsevier B.V. All rights reserved.

  13. PVP assisted hydrothermal fabrication and morphology-controllable fabrication of BiFeO{sub 3} uniform nanostructures with enhanced photocatalytic activities

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Xingfu; Mao, Weiwei [Key Laboratory for Organic Electronics & Information Displays (KLOEID), Synergetic Innovation Center for Organic Electronics and Information Displays (SICOEID), Institute of Advanced Materials - IAM, School of Materials Science and Engineering - SMSE, Nanjing University of Posts and Telecommunications - NUPT, Nanjing 210023 (China); School of Science, Advanced Energy Technology Center, Nanjing University of Posts and Telecommunications (NUPT), Nanjing 210023 (China); Zhang, Qiaoxia; Wang, Qi; Zhu, Yiyi; Zhang, Jian; Yang, Tao [Key Laboratory for Organic Electronics & Information Displays (KLOEID), Synergetic Innovation Center for Organic Electronics and Information Displays (SICOEID), Institute of Advanced Materials - IAM, School of Materials Science and Engineering - SMSE, Nanjing University of Posts and Telecommunications - NUPT, Nanjing 210023 (China); Yang, Jianping [School of Science, Advanced Energy Technology Center, Nanjing University of Posts and Telecommunications - NUPT, Nanjing 210023 (China); Li, Xing' ao, E-mail: lxahbmy@126.com [Key Laboratory for Organic Electronics & Information Displays (KLOEID), Synergetic Innovation Center for Organic Electronics and Information Displays (SICOEID), Institute of Advanced Materials - IAM, School of Materials Science and Engineering - SMSE, Nanjing University of Posts and Telecommunications - NUPT, Nanjing 210023 (China); Huang, Wei, E-mail: iamwhuang@njupt.edu.cn [Key Laboratory for Organic Electronics & Information Displays (KLOEID), Synergetic Innovation Center for Organic Electronics and Information Displays (SICOEID), Institute of Advanced Materials - IAM, School of Materials Science and Engineering - SMSE, Nanjing University of Posts and Telecommunications - NUPT, Nanjing 210023 (China); Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), National Synergistic Innovation Center for Advanced Materials - SICAM, Nanjing Tech University - NanjingTech, 30 South Puzhu Road, Nanjing 211816 (China)

    2016-08-25

    Bismuth ferrite (BiFeO{sub 3}) nanostructures with various morphologies (spindles, cubes and plates) have been successfully synthesized via a convenient one-pot hydrothermal method. The results show that three kinds of BiFeO{sub 3} products were obtained in this polyvinylpyrrolidone (PVP)-assisted hydrothermal reaction under different alkaline conditions. The resulting nanostructures were characterized using XRD and SEM. Possible formation mechanism for BiFeO{sub 3} nanostructures was proposed on the basis of our results. The experiments showed that the visible light absorptive capacity of the BiFeO{sub 3} nanostructures was significant influenced on the size and morphology. Notably, the as-prepared BiFeO{sub 3} plates with (104) facets exposed exhibit high efficiency for the degradation of methyl orange (MO) under visible light irradiation, suggesting potential applications in photocatalytic and related areas under visible light. - Highlights: • BiFeO{sub 3} nanostructures were synthesized via a PVP-assisted hydrothermal method. • The effect of the PVP and alkaline concentration was investigated. • The visible light absorptive capacity was significant influenced on the morphology. • The photocatalytic activity of the as-prepared BiFeO{sub 3} plates is the best.

  14. Fluorescence-based logic gate for sensing of Ca(2)(+) and F(-) ions using PVP crowned chrysene nanoparticles in aqueous medium.

    Science.gov (United States)

    Mahajan, Prasad G; Kolekar, G B; Patil, Shivajirao R

    2017-08-01

    Polyvinyl pyrrolidone (PVP) crowned chrysene nanoparticles (CHYNPs) were prepared by using a reprecipitation method. Dynamic light scattering (DLS) and scanning electron microscope (SEM) studies indicate that the monodispersed spherical nanoparticles bear a negative charge on their surfaces. The bathochromic spectral shift in the UV-visible and fluorescence spectrum of CHYNPs from chrysene (CHY) in acetone solution supports the J- type aggregation of nanoparticles. The aggregation-induced enhanced emission of CHYNPs at 486 and 522 nm decreases by increasing the concentration of the Ca(2)(+) ion solution. It can display an ON-OFF type fluorescence response with high selectivity towards Ca(2)(+) ions aqueous medium. Furthermore, the in situ generated PVP-CHYNPs-Ca(2)(+) ensemble could recover the quenched fluorescence upon the addition of fluoride anions resulting in an OFF-ON type sensor. The present method has a correlation coefficient R(2) = 0.988 with a detection limit of 1.22 μg/mL for Ca(2)(+) in the aqueous medium. The fluorescence changes of PVP crowned CHYNPs upon the addition of Ca(2)(+) and F(-) can be utilized as an INHIBIT logic gate at the molecular level, using Ca(2)(+) and F(-) chemical inputs and the fluorescence intensity signal as output. Copyright © 2017 John Wiley & Sons, Ltd.

  15. Comparing the characteristics of highly cited titles and highly alted titles

    Energy Technology Data Exchange (ETDEWEB)

    Didegah, F.; Bowman, T.D.; Bowman, S.; Hartley, J.

    2016-07-01

    This study examines differences in the types of titles for articles that show high altmetric activity (highly alted articles) versus highly cited articles. This work expands on previous research on document titles in combination with a grounded theory approach to develop a codebook in which articles were manually coded based on 11 characteristics. The results show that there are differences and similarities in titles across many of the examined characteristics; highly cited titles and highly mentioned titles on Wikipedia have some similar characteristics such as they have the the highest percentage of substantive words; in addition, there are no or very few titles referencing outside or with humor/lightness on both platforms. Twitter and Facebook also showed some similarities having the highest percentage of humorous/light titles and lowest percentage of substantive words in their titles. (Author)

  16. The effect of PVP on morphology, optical properties and electron paramagnetic resonance of Zn0.5Co0.5Fe2-xPrxO4 nanoparticles

    Science.gov (United States)

    Bitar, Z.; El-Said Bakeer, D.; Awad, R.

    2017-07-01

    Zinc Cobalt nano ferrite doped with Praseodymium, Zn0.5Co0.5Fe2-xPrxO4 (0 ≤ x ≤ 0.2), were prepared by co-precipitation method from an aqueous solution containing metal chlorides and two concentrations of poly(vinylpyrrolidone) (PVP) 0 and 30g/L as capping agent. The samples were characterized using X-ray powder diffraction (XRD), Transmission Electron Microscope (TEM), UV-visible optical spectroscopy, Fourier transform infrared (FTIR) and Electron Paramagnetic Resonance (EPR). XRD results display the formation of cubic spinel structure with space group Fd3m and the lattice parameter (a) is slightly decreased for PVP capping samples. The particle size that determined by TEM, decreases for PVP capping samples. The optical band energy Eg increases for PVP capping samples, confirming the variation of energy gap with the particle size. The FTIR results indicate that the metal oxide bands were shifted for the PVP capping samples. EPR data shows that the PVP addition increases the magnetic resonance field and hence decreases the g-factor.

  17. How property title impacts urban consolidation

    DEFF Research Database (Denmark)

    Easthope, Hazel; Warnken, Jan; Sherry, Cathy

    2014-01-01

    Continuing urbanisation is triggering an increase in multi-titled housing internationally. This trend has given rise to a substantial research interest in the social consequences of higher density living. Little enquiry, however, has been directed to examining how property title subdivisions gene...

  18. 24 CFR 3500.16 - Title companies.

    Science.gov (United States)

    2010-04-01

    ... 24 Housing and Urban Development 5 2010-04-01 2010-04-01 false Title companies. 3500.16 Section 3500.16 Housing and Urban Development Regulations Relating to Housing and Urban Development (Continued... DEVELOPMENT REAL ESTATE SETTLEMENT PROCEDURES ACT § 3500.16 Title companies. No seller of property that will...

  19. 31 CFR 505.01 - Short title.

    Science.gov (United States)

    2010-07-01

    ... 31 Money and Finance: Treasury 3 2010-07-01 2010-07-01 false Short title. 505.01 Section 505.01 Money and Finance: Treasury Regulations Relating to Money and Finance (Continued) OFFICE OF FOREIGN... CERTAIN MERCHANDISE BETWEEN FOREIGN COUNTRIES § 505.01 Short title. The regulations in this part may be...

  20. 18 CFR 415.1 - Short title.

    Science.gov (United States)

    2010-04-01

    ... 18 Conservation of Power and Water Resources 2 2010-04-01 2010-04-01 false Short title. 415.1 Section 415.1 Conservation of Power and Water Resources DELAWARE RIVER BASIN COMMISSION ADMINISTRATIVE MANUAL BASIN REGULATIONS-FLOOD PLAIN REGULATIONS Generally § 415.1 Short title. This part shall be known...

  1. 40 CFR 105.3 - Title.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 21 2010-07-01 2010-07-01 false Title. 105.3 Section 105.3 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) WATER PROGRAMS RECOGNITION AWARDS UNDER THE CLEAN WATER ACT General § 105.3 Title. The awards are known as the National Clean Water Act...

  2. Title I Dollars Support Community Schools

    Science.gov (United States)

    Pearson, Sarah S.; Blank, Martin J.

    2010-01-01

    Title I funds are available to districts and schools with high numbers or percentages of disadvantaged students to provide services, including academic enrichment services through Title I, Part A, so all the nation's children have an equal opportunity to education and can reach proficiency on state academic achievement standards and assessments.…

  3. 33 CFR 401.1 - Short title.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Short title. 401.1 Section 401.1 Navigation and Navigable Waters SAINT LAWRENCE SEAWAY DEVELOPMENT CORPORATION, DEPARTMENT OF TRANSPORTATION SEAWAY REGULATIONS AND RULES Regulations § 401.1 Short title. These regulations may be cited as the...

  4. 7 CFR 1955.141 - Transferring title.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 14 2010-01-01 2009-01-01 true Transferring title. 1955.141 Section 1955.141 Agriculture Regulations of the Department of Agriculture (Continued) RURAL HOUSING SERVICE, RURAL BUSINESS... Transferring title. (a)-(c) [Reserved] (d) Rent increases for MFH property. After approval of a credit sale for...

  5. 29 CFR 18.1103 - Title.

    Science.gov (United States)

    2010-07-01

    ... 29 Labor 1 2010-07-01 2010-07-01 true Title. 18.1103 Section 18.1103 Labor Office of the Secretary of Labor RULES OF PRACTICE AND PROCEDURE FOR ADMINISTRATIVE HEARINGS BEFORE THE OFFICE OF ADMINISTRATIVE LAW JUDGES Rules of Evidence Applicability § 18.1103 Title. These rules may be known as the United...

  6. 33 CFR 402.2 - Title.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Title. 402.2 Section 402.2 Navigation and Navigable Waters SAINT LAWRENCE SEAWAY DEVELOPMENT CORPORATION, DEPARTMENT OF TRANSPORTATION TARIFF OF TOLLS § 402.2 Title. This tariff may be cited as the St. Lawrence Seaway Tariff of Tolls...

  7. Land Titles and Rice Production in Vietnam

    DEFF Research Database (Denmark)

    Van Den Broeck, Katleen; Newman, Carol; Tarp, Finn

    In most of the empirical literature on land titling, the household is regarded as unitary, and land rights are found to have ambiguous effects on land allocation, investment and productivity. Using data from 12 provinces in Vietnam, we diversify land titles, and show in a household fixed effects...

  8. Student Achievement in Title I Schools

    Science.gov (United States)

    Diaz, Abby T.

    2017-01-01

    This researcher seeks to answer the following question: How did two elementary Title I schools, identified as "high performing" on the first Smarter Balanced assessment, address elements of Maslow's hierarchy of needs when developing school-wide initiatives to enhance student achievement? Many students in Title I schools face barriers to…

  9. Browse Title Index - African Journals Online

    African Journals Online (AJOL)

    Items 801 - 850 of 879 ... Vol 21, No 5 (2007), The usefulness of reflexive photography for qualitative research: A case study in higher education, Abstract. S Schulze. Vol 16, No ... Vol 25, No 2 (2011), Titles as discourse: Naming and framing research agendas as evident in theses titles in 1995–2004, Abstract. AV Bengesai, BB ...

  10. Informational Dynamics of Journal Article Titles.

    Science.gov (United States)

    Diener, Richard A. V.

    1984-01-01

    Analyzes changing information values of journal article titles (measured by counting total number of words, number of keywords, and computing proportion of substantive words). Use of linear regression to determine change patterns for sample of titles from four selected journals, six library journals, and six miscellaneous journals (1951-1980) is…

  11. 2 CFR 1.100 - Content of this title.

    Science.gov (United States)

    2010-01-01

    ... 2 Grants and Agreements 1 2010-01-01 2010-01-01 false Content of this title. 1.100 Section 1.100 Grants and Agreements ABOUT TITLE 2 OF THE CODE OF FEDERAL REGULATIONS AND SUBTITLE A Introduction to Title 2 of the CFR § 1.100 Content of this title. This title contains— (a) Office of Management and...

  12. Installation of groundwater observation tubes OL-PVP36-38 and drilling of shallow drillholes OL-PP70-71 at Olkiluoto in Eurajoki 2011

    Energy Technology Data Exchange (ETDEWEB)

    Toropainen, V. [Suomen Malmi Oy, Espoo (Finland)

    2012-05-15

    In order to widen the groundwater monitoring network at Olkiluoto, Posiva Oy contracted Suomen Malmi Oy (Smoy) to install new groundwater observation tubes to three locations and to drill two shallow drillholes with standpipes. The identification numbers of the groundwater observation tubes are OL-PVP36, OL-PVP37A, 37B, 37C, OL-PVP38A, 38B, 38C and 38D, and the shallow drillholes are named OL-PP70 and OL-PP71. The observation tubes were installed and the shallow holes drilled between September 22nd and October 12th in 2011. The drilling rig used in the installation work was a GM-200 rig. Drilling equipment consisted of casing tubes (90/77 mm) with drilling bit, 55 mm geo rods and 64 mm drilling bits and T76-equipment for drilling the shallow holes. Monitoring pipes (PVC, 60/52 mm) were lowered into the holes inside the casings. The monitoring pipes consist of a lower section of riser pipe, a middle section of screen pipe and an upper section of riser pipe. The screen pipe slot size is 0.3 mm and the length of the screen section is two metres. Protective stainless steel covers with lock-up caps were installed around the monitoring tubes and the shallow drillholes. In addition to the installation of the tubes, the work included water level measurements after installation. The core samples of the shallow drillholes were logged and reported by geologist. Geological logging included the following parameters: lithology, foliation, fracture parameters, fractured zones, core loss, weathering, fracture frequency, RQD and rock quality. (orig.)

  13. Service Locator - Family Planning Title X

    Data.gov (United States)

    U.S. Department of Health & Human Services — This locator tool will help you find Title X family planning centers that provide high quality and cost-effective family planning and related preventive health...

  14. Code of Federal Regulations Title 21

    Data.gov (United States)

    U.S. Department of Health & Human Services — This database contains the most recent revision from the Government Printing Office (GPO) of the Code of Federal Regulations (CFR) Title 21 - Food and Drugs.

  15. In situ FTIR spectroscopic study of the effect of CO2 sorption on H-bonding in PEG–PVP mixtures

    CSIR Research Space (South Africa)

    Labuschagne, Philip W

    2011-05-01

    Full Text Available recorded with a Bruker Equinox 55 FTIR spectrometer equipped with amercury?cadmium?telluride (MCT) detector. The resolution was 2 cm?1. 2.2.2. Sample preparation PEG and PVP raw materials were dried for 12h at 70 ?C in a vacuum oven (Model VO65.... In order to emphasize the effect of different PEG-400 concentra- tions on interaction behaviour, variations in the relative intensities of thesecondderivativebands representingH-bonded (Ih) and ?free? (If) carbonyl groups upon CO2 pressurisation...

  16. Native title: Its effects on petroleum exploration

    Energy Technology Data Exchange (ETDEWEB)

    Vickery, E. [Minter Ellison Baker O`Loughlin, Adelaide, SA (Australia)

    1995-12-31

    The existence of native title in Australia was recognised by the High Court in its historic Mabo No.2 judgement on 3 June 1992. Native title is a shorthand expression used to describe those activities pursued by native peoples in connection with their traditional lands, in accordance with traditional law and custom. It could be extinguished in many ways, and once extinguished cannot be revived. Following an intense public debate, the Commonwealth enacted the Native Title Act (NTA) which, for most purposes, commenced on 1 January 1994. The NTA recognizes and protects native title, enabling its future extinguishment in only limited cases, principally by government acquisition for public purposes which are actually fulfilled. This paper discusses the meaning and application of the NTA and the Racial Discrimination Act, 1975 (RDA) together with their impact on onshore and offshore petroleum activities. It concludes that access to land and security of title are important to petroleum exploration and that exploration companies need to be aware of the conflicts between statutory exploration rights and the rights of native title holders as owners of the land. 1 photo.

  17. Genetic susceptibility of periodontitis

    NARCIS (Netherlands)

    Laine, M.L.; Crielaard, W.; Loos, B.G.

    2012-01-01

    In this systematic review, we explore and summarize the peer-reviewed literature on putative genetic risk factors for susceptibility to aggressive and chronic periodontitis. A comprehensive literature search on the PubMed database was performed using the keywords ‘periodontitis’ or ‘periodontal

  18. Fourie susceptible.pmd

    African Journals Online (AJOL)

    Prof. Adipala Ekwamu

    a number of cultivars exhibited field resistance to halo blight and bacterial brown spot, all cultivars were more or less susceptible to .... Cerillos. Alubia. I. 91. 57. Kranskop. Red speckled sugar. II. 97. 63. OPS-RS1. Red speckled sugar. II. 96. 63. OPS-RS2. Red speckled sugar. I. 100. 61. OPS-RS3. Red speckled sugar. II. 97.

  19. Flexible resistive switching device based on poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/poly(4-vinylphenol) (PVP) composite and methyl red heterojunction

    Science.gov (United States)

    Hassan, Gul; Ali, Shawkat; Bae, Jinho; Lee, Chong Hyun

    2017-04-01

    To obtain a desired performance of non-volatile memory applications, heterojunction-based resistive switching devices have tremendous attractions. In this paper, we demonstrate resistive switching characteristics for heterojunction of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/poly(4-vinylphenol) (PVP) composite and methyl red sandwiched in between bottom and top silver (Ag) electrodes. The proposed heterojunction layers are fabricated through spin coater at 3000 rpm for 60 s each, and the Ag electrodes are deposited through a commercialized inkjet printer DMP-3000 on polyethyleneterephthalate (PET) substrate. To verify the proposed device, the resistive switching on dual polarity voltage of ±10.2 V is measured over more than 500 endurance cycles. The paper also presents an R off/ R on ratio which can adjust through an active layer's area and a blending ratio of the PEDOT:PSS and PVP. By applying the area of 100 μm2 and the blending ratio of 3:1, we achieve the higher R off/ R on ratio of 121, and its high resistance state (HRS) and low resistance state (LRS) are observed as 3000 kΩ and 24.7 kΩ, respectively. To maintain a long retention time, the device is encapsulated with PDMS, which changes a little variations of 52 Ω for HRS 498 Ω for LRS over 60 days. For the flexible realization to be utilized in wearable applications, it can be easily applied on a plastic substrate using printed technologies.

  20. Synergetic effect of TiO2 nano filler additives on conductivity and dielectric properties of PEO/PVP nanocomposite electrolytes for electrochemical cell applications

    Science.gov (United States)

    Koduru, H. K.; Kondamareddy, K. K.; Iliev, M. T.; Marinov, Y. G.; Hadjichristov, G. B.; Karashanova, D.; Scaramuzza, N.

    2017-01-01

    Sodium-ion conducting PEO/PVP blend based solid polymer electrolyte films complexed with NaIO4 salt and nano-sized TiO2 fillers are fabricated by employing a solution casting technique for Na-ion battery applications. Measurements of X-ray diffraction (XRD) and thermogravimetric analysis (TGA) are carried out to investigate the crystallinity and thermal stability of the solid polymer electrolytes. Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) studies are performed to understand the modifications in surface morphological features and to evaluate the size and distribution of dispersed nano-sized TiO2 fillers. The room temperature ionic conductivities of polymer electrolyte films are investigated by impedance analysis in the frequency range 1 MHz - 1 Hz. The nano-sized TiO2 (3 wt%) filled composite electrolyte of ‘PEO/PVP/NaIO4 (10 wt%)’ demonstrates a maximum room temperature conductivity of 9.82 X 10-6 S/cm. The influence of TiO2 filler on conductivity and dielectric properties are presented in this report.

  1. An investigation into the effect of spray drying temperature and atomizing conditions on miscibility, physical stability, and performance of naproxen-PVP K 25 solid dispersions.

    Science.gov (United States)

    Paudel, Amrit; Loyson, Yves; Van den Mooter, Guy

    2013-04-01

    The present study investigates the effect of changing spray drying temperature (40°C-120°C) and/or atomizing airflow rate (AR; 5-15 L/min) on the phase structure, physical stability, and performance of spray-dried naproxen-polyvinylpyrrolidone (PVP) K 25 amorphous solid dispersions. The modulated differential scanning calorimetry, attenuated total internal reflectance-Fourier transform infrared, and powder X-ray diffractometry (pXRD) studies revealed that higher inlet temperature (IT) or atomization airflow leads to the formation of amorphous-phase-separated dispersions with higher strongly H-bonded and free PVP fractions, whereas that prepared with the lowest IT was more homogeneous. The dispersion prepared with the lowest atomization AR showed trace crystallinity. Upon exposure to 75% relative humidity (RH) for 3 weeks, the phase-separated dispersions generated by spray drying at higher temperature or higher atomization airflow retained relatively higher amorphous drug fraction compared with those prepared at slow evaporation conditions. The humidity-controlled pXRD analysis at 98% RH showed that the dispersion prepared with highest atomization AR displayed the slowest kinetics of recrystallization. The molecular-level changes occurring during recrystallization at 98% RH was elucidated by spectroscopic monitoring at the same humidity. The rate and extent of the drug dissolution was the highest for dispersions prepared at the highest atomizing AR and the lowest for that prepared with the slowest atomizing condition. Copyright © 2013 Wiley Periodicals, Inc.

  2. Characterization of CH3SO3H-doped PMMA/PVP blend-based proton-conducting polymer electrolytes and its application in primary battery

    Science.gov (United States)

    Ambika, C.; Hirankumar, G.

    2016-02-01

    Various compositions of solid blend polymer electrolytes based on poly(methyl methacrylate) (PMMA)/poly(vinyl pyrrolidone) (PVP) complexed with methanesulfonic acid (MSA) as proton donor were prepared by solution casting technique. The complex nature of polymer blend with MSA was confirmed by Fourier transform infrared spectroscopy. Good thermal stability of PMMA/PVP blend polymer electrolyte was identified by thermogravimetric analysis. The surface morphology of the prepared electrolytes was studied through optical microscopy. Ion transport number was determined in the range of 0.93-0.97 for proton-conducting blend polymer electrolytes. The maximum conductivity value was calculated as 2.51 × 10-5 S/cm at 303 K for 14.04 mol% MSA-doped polymer electrolytes. Dielectric studies were also carried out. The electrochemical stability window of blend polymer electrolyte was found to be 1.82 V. Primary proton battery was fabricated with Zn + ZnSO4·7H2O/solid polymer electrolytes/MnO2. The discharge characteristics were studied at constant current drain of 5, 20 and 50 μA. The energy and power density were calculated as 0.27 W h kg-1 and 269.23 mW kg-1 for 20 μA of discharge, respectively.

  3. Studies on the thermodynamics and solute–solvent interaction of Polyvinyl pyrrolidone wrapped single walled carbon nanotubes (PVP-SWNTs in water over temperature range 298.15–313.15 K

    Directory of Open Access Journals (Sweden)

    Malahah Mohamed

    2017-05-01

    Full Text Available The water solubilisation of single walled carbon nanotubes (SWNTs has been achieved by polymer wrapping. The present study aims at highlighting the solute–solvent interaction and thermodynamic parameters in the solubilisation of polyvinyl pyrrolidone wrapped single walled carbon nanotubes (PVP-SWNTs in water. Conductivity and density values of both PVP and PVP-SWNTs have been determined in water maintaining different concentrations (0.005–0.1 g/L at temperatures 298.15, 303.15, 308.15 and 313.15 K. The conductance values have been used to evaluate the limiting molar conductance (∧om and the activation energy (Es. From the density values, the limiting partial molar volumes and expansibilities have been calculated. The estimated parameters were discussed in terms of solute–solvent interactions.

  4. 46 CFR 67.53 - Methods of establishing title.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Methods of establishing title. 67.53 Section 67.53... DOCUMENTATION OF VESSELS Title Requirements for Vessel Documentation § 67.53 Methods of establishing title. Title to a vessel may be established through one of the following methods: (a) Simplified method without...

  5. 29 CFR 452.8 - Trusteeship provisions, title III.

    Science.gov (United States)

    2010-07-01

    ... 29 Labor 2 2010-07-01 2010-07-01 false Trusteeship provisions, title III. 452.8 Section 452.8... AND DISCLOSURE ACT OF 1959 Other Provisions of the Act Affecting Title IV § 452.8 Trusteeship provisions, title III. Placing a labor organization under trusteeship consistent with title III, may have the...

  6. 48 CFR 32.503-14 - Protection of Government title.

    Science.gov (United States)

    2010-10-01

    ... title. 32.503-14 Section 32.503-14 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION... of Government title. (a) Since the Progress Payments clause gives the Government title to all of the... ensure that the Government title to these inventories is not compromised by other encumbrances...

  7. 24 CFR 203.366 - Conveyance of marketable title.

    Science.gov (United States)

    2010-04-01

    ... 24 Housing and Urban Development 2 2010-04-01 2010-04-01 false Conveyance of marketable title. 203... Conveyance of marketable title. (a) Satisfactory conveyance of title and transfer of possession. The mortgagee shall tender to the Commissioner a satisfactory conveyance of title and transfer of possession of...

  8. 24 CFR 232.595 - Eligibility of title.

    Science.gov (United States)

    2010-04-01

    ... 24 Housing and Urban Development 2 2010-04-01 2010-04-01 false Eligibility of title. 232.595... Fire Safety Equipment Title § 232.595 Eligibility of title. In order for the property which is to be... Commissioner shall determine that the title to the property is vested in the borrower as of the date the...

  9. Titles of LIS textbooks and research articles : a bibliometric study

    OpenAIRE

    Tiew, Wai Sin; Sen, B. K.; Kaur, Kiran; Lee, Lily

    1997-01-01

    Studies the number of keywords in the titles of library and information science textbooks and research articles. Results indicate that on an average the number of keywords in the titles of research articles and textbooks are 7.7 and 5 respectively and prove the hypothesis that the number of keywords in textbook titles is less than that of the research article titles

  10. 32 CFR 644.71 - Final Title Assembly.

    Science.gov (United States)

    2010-07-01

    ... 32 National Defense 4 2010-07-01 2010-07-01 true Final Title Assembly. 644.71 Section 644.71 National Defense Department of Defense (Continued) DEPARTMENT OF THE ARMY (CONTINUED) REAL PROPERTY REAL... Title Assembly. (a) Disposition of final title assemblies. The final title opinion and related papers...

  11. Genetic Susceptibility to Atherosclerosis

    Directory of Open Access Journals (Sweden)

    Sanja Kovacic

    2012-01-01

    Full Text Available Atherosclerosis is a complex multifocal arterial disease involving interactions of multiple genetic and environmental factors. Advances in techniques of molecular genetics have revealed that genetic ground significantly influences susceptibility to atherosclerotic vascular diseases. Besides further investigations of monogenetic diseases, candidate genes, genetic polymorphisms, and susceptibility loci associated with atherosclerotic diseases have been identified in recent years, and their number is rapidly increasing. This paper discusses main genetic investigations fields associated with human atherosclerotic vascular diseases. The paper concludes with a discussion of the directions and implications of future genetic research in arteriosclerosis with an emphasis on prospective prediction from an early age of individuals who are predisposed to develop premature atherosclerosis as well as to facilitate the discovery of novel drug targets.

  12. Marijuana Usage and Hypnotic Susceptibility

    Science.gov (United States)

    Franzini, Louis R.; McDonald, Roy D.

    1973-01-01

    Anonymous self-reported drug usage data and hypnotic susceptibility scores were obtained from 282 college students. Frequent marijuana users (more than 10 times) showed greater susceptibility to hypnosis than nonusers. (Author)

  13. Job title of recent bachelor's degree recipients

    Science.gov (United States)

    White, Susan C.

    2015-05-01

    Physics bachelor's degree recipients work in all kinds of professions—science writing, medicine, law, history of science, acting, music, healthcare and more. Since very few of these employees have the word "physics" in their job titles, it can be hard for new graduates to know where to look for jobs and how to find other recent physics graduates in the workforce. The American Institute of Physics and the Society of Physics Students joined forces on an NSF-funded grant to create career tools for undergraduate physics students.1 One of the tools available to students in the Careers Toolbox is a listing of common job titles of physics bachelors degree recipients working in various fields; some of the job titles are listed below.

  14. Browse Title Index - African Journals Online

    African Journals Online (AJOL)

    Items 101 - 150 of 613 ... Issue, Title. Vol 16, No 3 (2013), Chaos in Family Law: A Model for the Recognition of Intimate Relationships in South Africa, Abstract PDF. P Bakker. Vol 8, No 1 (2005), "Checks and balances reflections on the development of the doctrine of separation of powers under the South African constitution" ...

  15. Browse Title Index - African Journals Online

    African Journals Online (AJOL)

    Issue, Title. Vol 13, No 2 (1957), Dr. C. van Gelderen , De boeken der Koningen, opnieuw uit de grondtekst vertaald en verklaard, III, 2 Kon. 5-17, tweede druk, J. H. Kok N.V., Kampen, 1956, Abstract PDF. A. van Selms. Vol 13, No 2 (1957), Dr. C.J. Goslinga , De boeken Samuel opnieuw uit die grondtekst vertaalden ...

  16. 76 FR 60593 - Title VI; Proposed Circular

    Science.gov (United States)

    2011-09-29

    ... for FTA staff to make oral presentations about the two proposed Circulars and allow attendees an... proposed Circular would incorporate lessons learned from triennial reviews, discretionary Title VI... Implementation Plan for Limited English Proficient (LEP) persons now contains a summary of the DOT LEP guidance...

  17. Browse Title Index - African Journals Online

    African Journals Online (AJOL)

    Items 101 - 150 of 151 ... Issue, Title. Vol 6, No 1 (2013), Promoting responsible research conduct in a developing world academic context, Abstract PDF. L Horn. Vol 4, No 2 (2011), Psychometrics of the student version of the Jefferson Scale of Physician Empathy (JSPE-S) in final-year medical students in Johannesburg in ...

  18. Title IX--A Modest Success.

    Science.gov (United States)

    Abrams, Mary

    1982-01-01

    Title IX has helped bring change to discriminatory policies and practices including curriculum options, activities, sports, and changes in vocational education. It is argued that students need to see women and men in a broad range of positions in order to broaden their concept of potential careers for themselves. (MLW)

  19. Browse Title Index - African Journals Online

    African Journals Online (AJOL)

    Items 501 - 550 of 1238 ... Issue, Title. Vol 27, No 3 (2001), Flood frequency analysis at ungauged sites in the KwaZulu-Natal Province, South Africa, Abstract PDF. TR Kjeldsen, JC Smithers, RE Schulze. Vol 32, No 3 (2006):, Flood routing in ungauged catchments using Muskingum methods, Abstract PDF. MH Tewolde, JC ...

  20. Software Development Framework For Electronic Land Titles ...

    African Journals Online (AJOL)

    We hereby introduce a software development framework for electronically administering the records of Land Titles. The model is computer dependent, and the graphical presentations in the designs will simplify the job of software developers in the process of systems conversion from the existing cumbersome, disorganized ...

  1. Browse Title Index - African Journals Online

    African Journals Online (AJOL)

    Items 9351 - 9400 of 11090 ... Issue, Title. Vol 3, No 8 (2004), Role of sialic acids in the midguts of Trypanosoma congolense infected Culex pipense pipiense mosquitoes, Abstract PDF. AB Sallau, AJ Nok, IS Ndams, EO Balogun. Vol 6, No 14 (2007), Roles of agricultural biotechnology in ensuring adequate food security in ...

  2. Title I: Time to Get It Right

    Science.gov (United States)

    Roza, Marguerite; Lake, Robin

    2015-01-01

    Congress enacted the Elementary and Secondary Education Act (ESEA) 50 years ago as part of President Lyndon B. Johnson's "War on Poverty." The most expansive federal education bill ever passed, it was developed as redress, establishing that poor children needed more educational services than wealthier children. Title I of the ESEA…

  3. Browse Title Index - African Journals Online

    African Journals Online (AJOL)

    Issue, Title. Vol 15, No 2 (2016), Fetal Toxicity and Cytotoxicity of Lannea kerstingii Engl and Krause Stem Bark (Anacardiaceae), Abstract PDF. Aboudoulatif Diallo, Paolo Darre, Kossi Metowogo, Povi Lawson-evi, Divakar Selva, Yao Potchoo, Edmond Creppy, Muthiah Ramanathan. Vol 7, No 3 (2008), Flavonoids as ...

  4. 77 FR 52116 - Title VI; Final Circular

    Science.gov (United States)

    2012-08-28

    ... enforcement of Title VI disparate impact regulations, it did not undermine the validity of those regulations... streamlined this process. We have modified the definition of ``disparate impact'' for clarity. We decline to... process reengineering. In response, FTA will review the public engagement plan and its implementation when...

  5. Browse Title Index - African Journals Online

    African Journals Online (AJOL)

    Items 1 - 50 of 120 ... Issue, Title. Vol 33, No 1 (2017), 2014 Election forecast - a post-election analysis, Abstract. H.W. Ittmann, J.P. Holloway, N Dudeni-Tlhone. Vol 20, No 1 (2004), A bio-economic application to the Cape Rock Lobster resource using a delay difference modelling approach, Abstract PDF. E Roos. Vol 22, No 1 ...

  6. Browse Title Index - African Journals Online

    African Journals Online (AJOL)

    Items 8201 - 8250 of 11090 ... Issue, Title. Vol 6, No 7 (2007), Physico-chemical and microbiological characteristics of honey from the sudano-guinean zone of West Cameroon, Abstract PDF. J Tchoumboue, J Awah-Ndukum, FA Fonteh, ND Dongock, J Pinta, ZA Mvondo. Vol 14, No 26 (2015), Physicochemical and ...

  7. Cleveland Bilingual Education Program: Title VII ESEA.

    Science.gov (United States)

    Halasa, Ofelia

    This 1974-75 evaluation report of the Title VII Cleveland Bilingual Education Program discusses the degree to which process objectives were implemented and product objectives attained, and the impressions of project and school staff and parents. The goals of the bilingual program were to develop the ability to communicate and function in Spanish…

  8. Title IX and Intercollegiate Sports: Equal Opportunity?

    Science.gov (United States)

    Weistart, John

    1998-01-01

    After 25 years of federal Title IX regulation, only three dozen of the top 300 college athletics programs are in compliance. Women receive less than 40% of athletic scholarships. College sports are locked into a budgetary structure that favors two dominant men's sports, football and basketball. Divisive rhetoric and resistance delay balanced…

  9. Browse Title Index - African Journals Online

    African Journals Online (AJOL)

    Items 151 - 200 of 338 ... Issue, Title. Vol 19, No 2 (2015), Imaging in anorectal malformations: What does the surgeon need to know? Abstract PDF. Christopher Westgarth-Taylor, Tracy Westgarth-Taylor, Richard Wood, Marc Levitt. Vol 14, No 2 (2010), Imaging of a rare disorder: macrodystrophia lipomatosa, Abstract PDF.

  10. Magnetic susceptibilities of minerals

    Science.gov (United States)

    Rosenblum, Sam; Brownfield, I.K.

    2000-01-01

    Magnetic separation of minerals is a topic that is seldom reported in the literature for two reasons. First, separation data generally are byproducts of other projects; and second, this study requires a large amount of patience and is unusually tedious. Indeed, we suspect that most minerals probably are never investigated for this property. These data are timesaving for mineralogists who concentrate mono-mineralic fractions for chemical analysis, age dating, and for other purposes. The data can certainly be used in the ore-beneficiation industries. In some instances, magnetic-susceptibility data may help in mineral identification, where other information is insufficient. In past studies of magnetic separation of minerals, (Gaudin and Spedden, 1943; Tille and Kirkpatrick, 1956; Rosenblum, 1958; Rubinstein and others, 1958; Flinter, 1959; Hess, 1959; Baker, 1962; Meric and Peyre, 1963; Rojas and others, 1965; and Duchesne, 1966), the emphasis has been on the ferromagnetic and paramagnetic ranges of extraction. For readers interested in the history of magnetic separation of minerals, Krumbein and Pettijohn (1938, p. 344-346) indicated nine references back to 1848. The primary purpose of this paper is to report the magnetic-susceptibility data on as many minerals as possible, similar to tables of hardness, specific gravity, refractive indices, and other basic physical properties of minerals. A secondary purpose is to demonstrate that the total and best extraction ranges are influenced by the chemistry of the minerals. The following notes are offered to help avoid problems in separating a desired mineral concentrate from mixtures of mineral grains.

  11. Alcohol increases hypnotic susceptibility.

    Science.gov (United States)

    Semmens-Wheeler, Rebecca; Dienes, Zoltán; Duka, Theodora

    2013-09-01

    One approach to hypnosis suggests that for hypnotic experience to occur frontal lobe activity must be attenuated. For example, cold control theory posits that a lack of awareness of intentions is responsible for the experience of involuntariness and/or the subjective reality of hypnotic suggestions. The mid-dorso-lateral prefrontal cortex and the ACC are candidate regions for such awareness. Alcohol impairs frontal lobe executive function. This study examined whether alcohol affects hypnotisability. We administered 0.8 mg/kg of alcohol or a placebo to 32 medium susceptible participants. They were subsequently hypnotised and given hypnotic suggestions. All participants believed they had received some alcohol. Participants in the alcohol condition were more susceptible to hypnotic suggestions than participants in the placebo condition. Impaired frontal lobe activity facilitates hypnotic responding, which supports theories postulating that attenuation of executive function facilitates hypnotic response, and contradicts theories postulating that hypnotic response involves enhanced inhibitory, attentional or other executive function. Copyright © 2013. Published by Elsevier Inc.

  12. A simple, fast, and inexpensive CTAB-PVP-silica based method for genomic DNA isolation from single, small insect larvae and pupae.

    Science.gov (United States)

    Huanca-Mamani, W; Rivera-Cabello, D; Maita-Maita, J

    2015-07-17

    In this study, we report a modified CTAB-PVP method combined with silicon dioxide (silica) treatment for the extraction of high quality genomic DNA from a single larva or pupa. This method efficiently obtains DNA from small specimens, which is difficult and challenging because of the small amount of starting tissue. Maceration with liquid nitrogen, phenol treatment, and the ethanol precipitation step are eliminated using this methodology. The A260/A280 absorbance ratios of the isolated DNA were approximately 1.8, suggesting that the DNA is pure and can be used for further molecular analysis. The quality of the isolated DNA permits molecular applications and represents a fast, cheap, and effective alternative method for laboratories with low budgets.

  13. The dangerous new synthetic drug α-PVP as the hydrated chloride salt α-pyrrolidinopentiophenone hydrochloride 0.786-hydrate.

    Science.gov (United States)

    Wood, Matthew R; Bernal, Ivan; Lalancette, Roger A

    2016-01-01

    α-Pyrrolidinovalerophenone (α-PVP), a dangerous designer drug, is now being marketed around the world as a harmless `bath salt', when in reality it is a powerful β-ketone phenethylamine stimulant. A sample of the free base from a recent law-enforcement seizure was crystallized as the HCl salt [systematic name: 1-(1-oxo-1-phenylpentan-2-yl)pyrrolidin-1-ium chloride 0.786-hydrate], C15H22NO(+)·Cl(-)·0.786H2O. In the crystal structure, the propyl chain is nearly perpendicular to both the phenyl ring and the carbonyl group. The hydrogen-bonding scheme involves the quaternary N atom, the Cl(-) anion and the partially occupied (0.786) water molecule, forming centrosymmetric dimers.

  14. Graphene susceptibility in Holstein model

    Energy Technology Data Exchange (ETDEWEB)

    Mousavi, Hamze, E-mail: hamze.mousavi@gmail.co [Department of Physics, Razi University, Kermanshah (Iran, Islamic Republic of); Nano Science and Nano Technology Research Center, Razi University, Kermanshah (Iran, Islamic Republic of)

    2011-06-15

    We study the effects of the electron-phonon interaction on the temperature dependence of the orbital magnetic susceptibility of monolayer graphene. We use the linear response theory and Green's function formalism within the Holstein Hamiltonian model. The results show that the effects of the electron-phonon interaction on the susceptibility of graphene sheet have different behaviors in two temperature regions. In the low temperature region, susceptibility increases when the electron-phonon coupling strength increases. On the other hand, the susceptibility reduces with increasing the electron-phonon coupling strength in the high temperature region. - Highlights: Effect of electron-phonon interaction on the susceptibility of graphene is studied. Linear response theory and Green's function technique in Holstein model are used. Effect of electron-phonon on susceptibility has different behaviors in two temperature regions.

  15. Topological susceptibility from slabs

    Energy Technology Data Exchange (ETDEWEB)

    Bietenholz, Wolfgang [Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, A.P. 70-543, Distrito Federal, C.P. 04510 (Mexico); Forcrand, Philippe de [Institute for Theoretical Physics, ETH Zürich,CH-8093 Zürich (Switzerland); CERN, Physics Department, TH Unit, CH-1211 Geneva 23 (Switzerland); Gerber, Urs [Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, A.P. 70-543, Distrito Federal, C.P. 04510 (Mexico); Instituto de Física y Matemáticas, Universidad Michoacana de San Nicolás de Hidalgo,Edificio C-3, Apdo. Postal 2-82, Morelia, Michoacán, C.P. 58040 (Mexico)

    2015-12-14

    In quantum field theories with topological sectors, a non-perturbative quantity of interest is the topological susceptibility χ{sub t}. In principle it seems straightforward to measure χ{sub t} by means of Monte Carlo simulations. However, for local update algorithms and fine lattice spacings, this tends to be difficult, since the Monte Carlo history rarely changes the topological sector. Here we test a method to measure χ{sub t} even if data from only one sector are available. It is based on the topological charges in sub-volumes, which we denote as slabs. Assuming a Gaussian distribution of these charges, this method enables the evaluation of χ{sub t}, as we demonstrate with numerical results for non-linear σ-models.

  16. Topological Susceptibility from Slabs

    CERN Document Server

    Bietenholz, Wolfgang; Gerber, Urs

    2015-01-01

    In quantum field theories with topological sectors, a non-perturbative quantity of interest is the topological susceptibility chi_t. In principle it seems straightforward to measure chi_t by means of Monte Carlo simulations. However, for local update algorithms and fine lattice spacings, this tends to be difficult, since the Monte Carlo history rarely changes the topological sector. Here we test a method to measure chi_t even if data from only one sector are available. It is based on the topological charges in sub-volumes, which we denote as slabs. Assuming a Gaussian distribution of these charges, this method enables the evaluation of chi_t, as we demonstrate with numerical results for non-linear sigma-models.

  17. Title IX: With New Opportunities, Girls' Interest Rises

    Science.gov (United States)

    Toporek, Bryan

    2012-01-01

    On June 23, 1972, President Richard M. Nixon signed into law Title IX of the Education Amendments of 1972, which prohibits gender discrimination in any federally financed education program or activity. Title IX is far-reaching, but the law is most often associated with school and college athletics. Title IX allows schools to prove their athletic…

  18. 27 CFR 70.102 - Coordination with title 11.

    Science.gov (United States)

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 2 2010-04-01 2010-04-01 false Coordination with title 11... § 70.102 Coordination with title 11. (a) Certain failures to pay tax. No addition to the tax shall be... respect to a period during which a case is pending under Title 11 of the United States Code— (1) If such...

  19. 24 CFR 241.1080 - Eligibility of title.

    Science.gov (United States)

    2010-04-01

    ... 24 Housing and Urban Development 2 2010-04-01 2010-04-01 false Eligibility of title. 241.1080...-Eligibility Requirements § 241.1080 Eligibility of title. In order for the project to be eligible for insurance, the Commissioner shall determine that the title to the property is vested in the borrower as of...

  20. 13 CFR 314.9 - Recorded statement-title.

    Science.gov (United States)

    2010-01-01

    ... 13 Business Credit and Assistance 1 2010-01-01 2010-01-01 false Recorded statement-title. 314.9... PROPERTY Personal Property § 314.9 Recorded statement—title. For all Projects which EDA determines involve... by EDA to be recorded, the Recipient must hold title to the Personal Property acquired or improved as...

  1. 29 CFR 1601.93 - Opinions-title VII.

    Science.gov (United States)

    2010-07-01

    ... 29 Labor 4 2010-07-01 2010-07-01 false Opinions-title VII. 1601.93 Section 1601.93 Labor Regulations Relating to Labor (Continued) EQUAL EMPLOYMENT OPPORTUNITY COMMISSION PROCEDURAL REGULATIONS Title VII Interpretations and Opinions by the Commission § 1601.93 Opinions—title VII. Only the following...

  2. 48 CFR 35.014 - Government property and title.

    Science.gov (United States)

    2010-10-01

    ... title. 35.014 Section 35.014 Federal Acquisition Regulations System FEDERAL ACQUISITION REGULATION... title. (a) The requirements in part 45 for establishing and maintaining control over Government property... otherwise, the policies in subparagraphs (1) through (4) following, regarding title to equipment (and other...

  3. 48 CFR 1335.014 - Government property and title.

    Science.gov (United States)

    2010-10-01

    ... title. 1335.014 Section 1335.014 Federal Acquisition Regulations System DEPARTMENT OF COMMERCE SPECIAL CATEGORIES OF CONTRACTING RESEARCH AND DEVELOPMENT CONTRACTING 1335.014 Government property and title. The designee authorized to determine that the policies in FAR 35.014(b)(1)-(4) will not apply regarding title...

  4. Futurist Art: Motion and Aesthetics As a Function of Title.

    Science.gov (United States)

    Mastandrea, Stefano; Umiltà, Maria A

    2016-01-01

    Very often the titles of Futurist paintings contain words denoting movement in order to satisfy their artistic poetic focused on motion and velocity. The aim of the present study is to investigate the reported dynamism and aesthetic quality of several Futurist artworks as a function of their title. Ten Futurist artworks with a movement-related word in the title were selected for this study. The titles were manipulated, resulting in four conditions for each painting: the "original title" with the movement word; an "increased" title in which an adjective was added in order to intensify the sense of dynamism; a "decreased" title, in which the movement word was eliminated; no title. Participants evaluated the movement suggested by each painting in the four different title conditions, rated their beauty and reported how much they liked the work. Results showed that the manipulation of the title had an effect on the reported movement: compared to the others, paintings presented with the "original" and with the "increased" title received significant higher movement scores. Of interest, beauty did not differ across conditions, but liking was higher for the conditions with more movement. Lastly, positive correlations between the quantity of perceived movement and aesthetic evaluation were found. From the present results it can be concluded that Futurists attributed much relevance to the titles of their artworks in order to effectively increase the expression of the movement represented.

  5. 32 CFR 644.356 - Report on Government title.

    Science.gov (United States)

    2010-07-01

    ... 32 National Defense 4 2010-07-01 2010-07-01 true Report on Government title. 644.356 Section 644... General Services Administration (gsa) § 644.356 Report on Government title. In all cases where Government... thereof), a report prepared by a qualified employee of the holding agency on the Government's title to the...

  6. 48 CFR 3052.217-96 - Title (USCG).

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 7 2010-10-01 2010-10-01 false Title (USCG). 3052.217-96... of Provisions and Clauses 3052.217-96 Title (USCG). As prescribed in USCG guidance at (HSAR) 48 CFR 3017.9000(a) and (b), insert the following clause: Title (DEC 2003) (a) Unless otherwise provided...

  7. 24 CFR 241.595 - Eligibility of title.

    Science.gov (United States)

    2010-04-01

    ... 24 Housing and Urban Development 2 2010-04-01 2010-04-01 false Eligibility of title. 241.595... Meters in Multifamily Projects Without a HUD-Insured or HUD-Held Mortgage Title § 241.595 Eligibility of title. In order for the property which is to be the security for a loan to be insured under this subpart...

  8. 29 CFR 2200.31 - Caption; titles of cases.

    Science.gov (United States)

    2010-07-01

    ... the upper right of the page, opposite the title, the docket number, if known, assigned by the... 29 Labor 9 2010-07-01 2010-07-01 false Caption; titles of cases. 2200.31 Section 2200.31 Labor... Pleadings and Motions § 2200.31 Caption; titles of cases. (a) Notice of contest cases. Cases initiated by a...

  9. 14 CFR 1245.109 - Assignment of title to NASA.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 5 2010-01-01 2010-01-01 false Assignment of title to NASA. 1245.109... INTELLECTUAL PROPERTY RIGHTS Patent Waiver Regulations § 1245.109 Assignment of title to NASA. (a) The instrument of waiver set forth in § 1245.115(c) shall be voided by NASA with respect to the domestic title to...

  10. The title of Philostratus' Life of Apollonius of Tyana

    NARCIS (Netherlands)

    Boter, G.J.

    2015-01-01

    The title of Philostratus' Life of Apollonius of Tyana as it stands in all editions since Kayser's 1844 edition, is not correct. The genuine title of the work is. The suggestion by Ewen Bowie, that the title of the work characterizes it as a novel, must therefore be dismissed. The meaning of the

  11. Microwave susceptibility experiments

    Energy Technology Data Exchange (ETDEWEB)

    McConaghy, C.

    1984-05-29

    In certain experimental environments, systems can be affected or damaged by microwave pulses. I have conducted tests at LLNL to understand the phenomenology of microwave susceptibility of system components and subsystem components. To date, my experiments have concentrated on bipolar transistors, similar to what might be used in discrete analog circuits, and on CMOS RAM chips, which might be used in a computer memory system. I observed a decrease in failure energies for both the transistor and the integrated curcuit as I shortened the microwave pulse width. An S band (2.86 GHz) transmit/receive (T/R) tube has also been tested both at S band and at X band (8.16 GHz). The S band pulse had limitations in rise-time from zero power, which had an effect on the amount of power that could be transmitted through the T/R tube, as much as 0.7% of the incident power passed through the tube. All tests were conducted in closed-waveguide or coax test-fixtures, in contrast to the anechoic chambers utilized by other experimenters. I have used both S band and X band Klystron generators. For very high power (greater than 1 MW), I used an additional pulse-compression cavity at S band. Other subsystem components such as an X band mixer and an X band T/R tube will be tested in the future. 8 references.

  12. [Antimicrobial susceptibility cumulative reports].

    Science.gov (United States)

    Canut-Blasco, Andrés; Calvo, Jorge; Rodríguez-Díaz, Juan Carlos; Martínez-Martínez, Luis

    2016-10-01

    Cumulative reports on antimicrobial susceptibility tests data are important for selecting empirical treatments, as an educational tool in programs on antimicrobial use, and for establishing breakpoints defining clinical categories. These reports should be based on data validated by clinical microbiologists using diagnostic samples (not surveillance samples). In order to avoid a bias derived from including several isolates obtained from the same patient, it is recommended that, for a defined period, only the first isolate is counted. A minimal number of isolates per species should be presented: a figure of >=30 isolates is statistically acceptable. The report is usually presented in a table format where, for each cell, information on clinically relevant microorganisms-antimicrobial agents is presented. Depending on particular needs, multiple tables showing data related to patients, samples, services or special pathogens can be prepared. Copyright © 2015 Elsevier España, S.L.U. and Sociedad Española de Enfermedades Infecciosas y Microbiología Clínica. All rights reserved.

  13. Title I versus Non-Title I Students and Standardized Test Scores in a School District in Georgia

    Science.gov (United States)

    Ross, Charles

    2016-01-01

    The Title I program was established to support students who were enrolled in schools that had high rates of children from low-income households. The program's goal was to provide supplemental services that would assist in raising the academic success of students in Title I schools so that they achieve comparable outcomes to children in Non-Title I…

  14. Academic Achievement Differences between Title I Students Enrolled in Music Classes and Title I Students Who Are Not

    Science.gov (United States)

    McDaniel, Brian

    2011-01-01

    Purpose. The purpose of the study was to determine academic achievement differences between those Title I students enrolled in music classes and Title I students who are not enrolled in music classes. A second purpose was to determine educators' perceptions regarding the educational justice implications of excluding nonproficient Title I students…

  15. Titles as Discourse: Naming and Framing Research Agendas as Evident in Theses Titles in 1995-2004

    Science.gov (United States)

    Bengesai, A. V.; Goba, B. B.; Karlsson, J.

    2011-01-01

    This article examines the discourses of theses titles as postgraduate students name and frame their research. It does this by analysing the discourse, nature and trends of title construction in Master's and Ph.D. research titles 1995-2004 in all universities in South Africa. The dominant discourses are analysed using Foucault's approach to…

  16. Formulating the Right Title for a Research Article.

    Science.gov (United States)

    Bavdekar, Sandeep B

    2016-02-01

    Title is an important part of the article. It condenses article content in a few words and captures readers' attention. A good title for a research article is the one which, on its own, is able to introduce the research work to the fullest extent, but in a concise manner. Writing scientific titles that are informative and attractive is a challenging task. This communication describes the importance of titles and the methods of creating appropriate titles for research papers. © Journal of the Association of Physicians of India 2011.

  17. Biomedical journal title changes: reasons, trends, and impact.

    Science.gov (United States)

    Afes, V B; Wrynn, P E

    1993-01-01

    A study was conducted to document the impact of biomedical journal title changes on medical libraries and to increase awareness of the reasons titles are changed. The study consisted of two parts: a survey of academic health sciences libraries in the United States and Canada and an analysis of title changes from two different years. The survey response rate was 83%. The majority of respondents commented on difficulties in identifying and processing title changes, often resulting in the delay or loss of information. The analysis revealed that a third of title changes were not justified by the journal. The study results substantiate the need to standardize title change reporting by publishers. A standard developed by the National Information Standards Organization requires publishers to conform to standardized practices for notification. This standard precisely reflects the concerns reflected in both the survey and the study of title changes, and librarians are urged to ensure that the standard is implemented by publishers. PMID:8428189

  18. Evolution of the Title of Ukrainian Works

    Directory of Open Access Journals (Sweden)

    Lyudmila Yuldasheva

    2017-11-01

    Full Text Available The article is devoted to the study of the phenomenon of the title of folklore and literary Ukrainian works while taking into account changes in its characteristics with time. The emphasis is on the main formal and semantic features of the headings of folklore works, works of ancient Ukrainian literature, the literature of the end of the XVIII-XI centuries, the literature of the XX century, works of the period of modern independent Ukraine. The dynamics are studied and the main tendencies of the nomination of works in the historical perspective are singled out.

  19. Wisconsin Public Service, Weston Generating Station; Petition to Object to Issuance of Title V Operating Permit

    Science.gov (United States)

    This document may be of assistance in applying the Title V air operating permit regulations. This document is part of the Title V Petition Database available at www2.epa.gov/title-v-operating-permits/title-v-petition-database.

  20. Tennessee Valley Authority, Paradise Fossil Plant; Order Responding Petition to Object to Title V Operating Permit

    Science.gov (United States)

    This document may be of assistance in applying the Title V air operating permit regulations. This document is part of the Title V Petition Database available at www2.epa.gov/title-v-operating-permits/title-v-petition-database.

  1. Tennessee Valley Authority, Paradise Fossil Plant; Petition to Object to Title V Operating Permit

    Science.gov (United States)

    This document may be of assistance in applying the Title V air operating permit regulations. This document is part of the Title V Petition Database available at www2.epa.gov/title-v-operating-permits/title-v-petition-database.

  2. Cemex, Inc., Lyons, Colorado; Petition to Object (or reopen) to Title V Operating Permit

    Science.gov (United States)

    This document may be of assistance in applying the Title V air operating permit regulations. This document is part of the Title V Petition Database available at www2.epa.gov/title-v-operating-permits/title-v-petition-database.

  3. Tradewinds Veneer Mill, Ookala, Hawaii; Petition to Object to Title V Operating Permit

    Science.gov (United States)

    This document may be of assistance in applying the Title V air operating permit regulations. This document is part of the Title V Petition Database available at www2.epa.gov/title-v-operating-permits/title-v-petition-database.

  4. Tradewinds Veneer Mill, Ookala, Hawaii; Petiton to Object to Title V Operating Permit

    Science.gov (United States)

    This document may be of assistance in applying the Title V air operating permit regulations. This document is part of the Title V Petition Database available at www2.epa.gov/title-v-operating-permits/title-v-petition-database.

  5. Georgia Power Company, Wansley Steam Electric Generating Plant; Petition to Object to Title V Operating Permit

    Science.gov (United States)

    This document may be of assistance in applying the Title V air operating permit regulations. This document is part of the Title V Petition Database available at www2.epa.gov/title-v-operating-permits/title-v-petition-database.

  6. [Antimicrobial susceptibility in Chile 2012].

    Science.gov (United States)

    Cifuentes-D, Marcela; Silva, Francisco; García, Patricia; Bello, Helia; Briceño, Isabel; Calvo-A, Mario; Labarca, Jaime

    2014-04-01

    Bacteria antimicrobial resistance is an uncontrolled public health problem that progressively increases its magnitude and complexity. The Grupo Colaborativo de Resistencia, formed by a join of experts that represent 39 Chilean health institutions has been concerned with bacteria antimicrobial susceptibility in our country since 2008. In this document we present in vitro bacterial susceptibility accumulated during year 2012 belonging to 28 national health institutions that represent about 36% of hospital discharges in Chile. We consider of major importance to report periodically bacteria susceptibility so to keep the medical community updated to achieve target the empirical antimicrobial therapies and the control measures and prevention of the dissemination of multiresistant strains.

  7. pso.ATION AND ANTIMICROBIAL SUSCEPTIBILITY

    African Journals Online (AJOL)

    isolates vere made using standard methods, Antibiotic susceptibility tests against commonly prescribed ... Acute otitis media is rapid with short .... sensitivity tests. Antimicrobial susceptibility tests: The antimicrobial susceptibility patterns of major Gram positive and negative bacterial isolates obtained from clinical specimens.

  8. Influence of solvent composition on the miscibility and physical stability of naproxen/PVP K 25 solid dispersions prepared by cosolvent spray-drying.

    Science.gov (United States)

    Paudel, Amrit; Van den Mooter, Guy

    2012-01-01

    To investigate the influence of solvent properties on the phase behavior and physical stability of spray-dried solid dispersions containing naproxen and PVP K 25 prepared from binary cosolvent systems containing methanol, acetone and dichloromethane. The viscosity, polymer globular size and evaporation rate of the spray-drying feed solutions were characterized. The solid dispersions were prepared by spray-drying drug-polymer solutions in binary solvent blends containing different proportions of each solvent. The phase behavior was investigated with mDSC, pXRD, FT-IR and TGA. Further, physical stability of solid dispersions was assessed by analyzing after storage at 75% RH. The solid dispersions prepared from solvent/anti-solvent mixture showed better miscibility and physical stability over those prepared from the mixtures of good solvents. Thus, solid dispersions prepared from dichloromethane-acetone exhibited the best physicochemical attributes followed by those prepared from methanol-acetone. FT-IR analysis revealed differential drug-polymer interaction in solid dispersions prepared from various solvent blends, upon the exposure to elevated humidity. Spray-drying from a cocktail of good solvent and anti-solvent with narrower volatility difference produces solid dispersions with better miscibility and physical stability resulting from the simultaneous effect on the polymer conformation and better dispersivity of drug.

  9. Screening of process variables to enhance the solubility of famotidine with 2-HydroxyPropyl-β-Cyclodextrin & PVP K-30 by using Plackett-Burman design approach.

    Science.gov (United States)

    Verma, Umakant; Naik, Jitendra B; Patil, Jayesh S; Yadava, Sunil K

    2017-08-01

    In the present work, inclusion complex of famotidine (FMT) was prepared with (2-HydroxyPropyl)-β-Cyclodextrin (HP-β-CyD) and polyvinylpyrrolidone K-30 (PVP K-30) by spray drying technique to enhance the solubility of famotidine. FMT is a potent histamine H 2 -receptor antagonist having low solubility as well as oral bioavailability. In order to enhance the solubility of FMT, a quality by design (QbD) approach has been used by employing Plackett-Burman design (PBD). With the application of PBD, seven independent process variables were investigated and optimized for maximum solubility. The developed inclusion complex was characterized for solubility, encapsulation efficiency, FTIR, FESEM, XRD. In-vitro drug release study was also performed by preparing fast dissolving tablets of inclusion complex. Solubility of FMT in prepared complex was found 38 fold higher than pure FMT while %EE was found 92.10%. Statistical analysis of the data (ANOVA) indicates an adequate model fitting predicting the effect of process parameters affecting the solubility. In conclusion, spray dried inclusion complex can effectively increases the solubility as well as dissolution rate of the FMT and other active pharmaceutical ingredients in combination of the fast dissolving tablets. Copyright © 2017 Elsevier B.V. All rights reserved.

  10. Bioevaluation of Novel Anti-Biofilm Coatings Based on PVP/Fe3O4 Nanostructures and 2-((4-Ethylphenoxymethyl-N- (arylcarbamothioylbenzamides

    Directory of Open Access Journals (Sweden)

    Carmen Limban

    2014-08-01

    Full Text Available Novel derivatives were prepared by reaction of aromatic amines with 2-(4-ethylphenoxymethylbenzoyl isothiocyanate, affording the N-[2-(4-ethylphenoxymethyl benzoyl]-Nꞌ-(substituted phenylthiourea. Structural elucidation of these compounds was performed by IR, NMR spectroscopy and elemental analysis. The new compounds were used in combination with Fe3O4 and polyvinylpyrrolidone (PVP for the coating of medical surfaces. In our experiments, catheter pieces were coated by Matrix Assisted Pulsed Laser Evaporation (MAPLE technique. The microbial adherence ability was investigated in 6 multi-well plates by using culture based methods. The obtained surfaces were also assessed for their cytotoxicity with respect to osteoblast cells, by using fluorescence microscopy and MTT assay. The prepared surfaces by advanced laser processing inhibited the adherence and biofilm development ability of Staphylococcus aureus and Pseudomonas aeruginosa tested strains while cytotoxic effects on the 3T3-E1 preosteoblasts embedded in layer shaped alginate hydrogels were not observed. These results suggest that the obtained medical surfaces, based on the novel thiourea derivatives and magnetic nanoparticles with a polymeric shell could represent a promising alternative for the development of new and effective anti-infective strategies.

  11. Hypnotic susceptibility and dream characteristics.

    Science.gov (United States)

    Zamore, N; Barrett, D

    1989-11-01

    This study examined the relationship of hypnotic susceptibility to a variety of dream characteristics and types of dream content. A Dream Questionnaire was constructed synthesizing Gibson's dream inventory and Hilgard's theoretical conceptions of hypnosis. Employing the Harvard Group Scale of Hypnotic Susceptibility and the Field Inventory for evaluating hypnotic response, several dream dimensions correlated significantly with hypnotizability. For subjects as a whole, the strongest correlates were the frequency of dreams which they believed to be precognitive and out-of-body dreams. Ability to dream on a chosen topic also correlated significantly with hypnotic susceptibility for both genders. For females only, there was a negative correlation of hypnotic susceptibility to flying dreams. Absorption correlated positively with dream recall, ability to dream on a chosen topic, reports of conflict resolution in dreams, creative ideas occurring in dreams, amount of color in dreams, pleasantness of dreams, bizarreness of dreams, flying dreams and precognitive dreams.

  12. Ancestral susceptibility to colorectal cancer

    Czech Academy of Sciences Publication Activity Database

    Huhn, S.; Pardini, Barbara; Naccarati, Alessio; Vodička, Pavel (ed.); Hemminki, K.; Försti, A.

    2012-01-01

    Roč. 27, č. 2 (2012), s. 197-204 ISSN 0267-8357 R&D Projects: GA ČR GA310/07/1430; GA ČR GAP304/10/1286 Grant - others:EU FP7(XE) HEALTH-F4-2007-200767 Institutional research plan: CEZ:AV0Z50390512 Keywords : cancer susceptibility * molecular epidemiology * genetic susceptibility Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 3.500, year: 2012

  13. Freehold title issues of significance to the industry

    Energy Technology Data Exchange (ETDEWEB)

    Scherman, B.J. [Balfour Moss, Regina, SK (Canada)

    2005-07-01

    Thousands of top leases still survive in Saskatchewan, and are complicating access to oil and gas resources. This paper examined recent developments in Saskatchewan law applicable to freehold title, with particular reference to a judicial decision relating to top leases and the introduction of an electronic land titles system. The validity of top leases was discussed as well as issues concerning contraventions of the rule against perpetuities. Conversion to the new Land Titles Act of 2000 has involved the creation of an electronic ownership registry for each surface parcel and each granted mineral commodity associated with a mineral parcel, and allowed for multiple titles created within the ownership registry for each surface parcel or mineral commodity within a mineral parcel due to tenants in common or fractional ownerships. An audit report with a 95 per cent degree of confidence found the error rate resulting from the land titles conversion was 3 per cent and the error rate in the Writ Registry conversion was 3.5 per cent. Due to an amendment, mineral certification is no longer mandatory when registering a transfer of an uncertified mineral title in a producing area. However, there is no assurance of title or access to assurance fund compensation if transfers are made without certification. The conversion process will perpetuate many of the existing errors regarding minerals. Transfers of uncertified mineral titles or registration of interests against uncertified mineral titles can occur, but there is no statutory assurance that this will result in a valid and effective title until certification of the underlying mineral occurs. Recommendations included searching original grants to ensure that there are not 2 or more grants for the same mineral rights; searching the last paper title prior to conversion; and, searching back from the current mineral title to the certification by the registrar.

  14. What Difference Does a Title Make

    DEFF Research Database (Denmark)

    Balle, Søren Hattesen

    The subtitles placed in the margins of Elizabeth Bishop’s prose poem “Twelve O’Clock News” function in an ambiguously reassuring and unsettling manner, thus both inviting and resisting interpretation of the sections they entitle. The poem’s main title does its proper job of entitlement, as spelled....... On such a reading, the poem is often given further significance through a contextual interpretation, taking into consideration that its time of writing coincided with the Vietnam War. In this light, the poem is interpreted as a critical comment on how through its ostensibly objective and neutral tone news reporting...... adds just as much to the infliction of cruelty and alienation on its victims as does the war itself. This aspect, many critics point out, is underlined by the distance which the textual layout of the poem introduces between the text itself and its subtitles. Since the subtitles form a list...

  15. Effects of additions of dimethyl siloxanes and ethylene oxide (SEO) copolymers in tensile break (Tb), in gels and swelling percentage of poly(n-vinyl-2-pyrrolidone) (PVP) crosslinking films by electron beams; Influencia da adicao dos copolimeros de dimetilsiloxano e oxido de etileno (SEO) na tensao de ruptura (Tb), na porcentagem de gel e de intumescimento de filmes de poli(n-vinil-2-pirrolidona) (PVP) reticulados por feixes de eletrons

    Energy Technology Data Exchange (ETDEWEB)

    Souza, A.; Miranda, A.; Hutzler, B.; Silva, L.G.A. [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil); Nunes, S.P. [Universidade Estadual de Campinas, SP (Brazil). Inst. de Quimica

    1997-12-01

    When PVP gels are irradiated a self-supported film formation occur because of a crosslinking process. Such process consists of the recombination of the macro radicals during the direct or indirect interaction of ionizing radiation producing tridimensional networks. The aim of this work is to improve the tensile break (Tb) of the film without any harm to its biomedic characteristics. Thus, the SEO copolymers were chosen like coadjuvants, which show excellent hydrophilic characteristic and have been used for medical purposes. It is observed that films constituted by 6% PVP in the presence of the agar show a maximum Tb equal to 0,05 Mpa. The adding of 2,5% of the SEO in such films increase the maximum Tb to 0,08 MPa, the elevation was of 60%.It is noticed also that the increase of SEO concentration promotes an increase in the gels percentage and a decrease of the swelling percentage. So we conclude that the presence of the SEO favors the increase of crosslinking degree where 2,5% of the copolymers in films constituted by 6% of PVP and 0,4% of agar are enough to increase the Tb by 60%. (author). 13 refs., 4 figs.

  16. Periodic Monitoring Guidance for Title V Operating Permits Programs

    Science.gov (United States)

    This document may be of assistance in applying the Title V air operating permit regulations. This document is part of the Title V Policy and Guidance Database available at www2.epa.gov/title-v-operating-permits/title-v-operating-permit-policy-and-guidance-document-index. Some documents in the database are a scanned or retyped version of a paper photocopy of the original. Although we have taken considerable effort to quality assure the documents, some may contain typographical errors. Contact the office that issued the document if you need a copy of the original.

  17. Citation Oil and Gas Corporation... Title V Applicability Determination

    Science.gov (United States)

    This document may be of assistance in applying the Title V air operating permit regulations. This document is part of the Title V Policy and Guidance Database available at www2.epa.gov/title-v-operating-permits/title-v-operating-permit-policy-and-guidance-document-index. Some documents in the database are a scanned or retyped version of a paper photocopy of the original. Although we have taken considerable effort to quality assure the documents, some may contain typographical errors. Contact the office that issued the document if you need a copy of the original.

  18. Susceptibility Genes in Thyroid Autoimmunity

    Directory of Open Access Journals (Sweden)

    Yoshiyuki Ban

    2005-01-01

    Full Text Available The autoimmune thyroid diseases (AITD are complex diseases which are caused by an interaction between susceptibility genes and environmental triggers. Genetic susceptibility in combination with external factors (e.g. dietary iodine is believed to initiate the autoimmune response to thyroid antigens. Abundant epidemiological data, including family and twin studies, point to a strong genetic influence on the development of AITD. Various techniques have been employed to identify the genes contributing to the etiology of AITD, including candidate gene analysis and whole genome screening. These studies have enabled the identification of several loci (genetic regions that are linked with AITD, and in some of these loci, putative AITD susceptibility genes have been identified. Some of these genes/loci are unique to Graves' disease (GD and Hashimoto's thyroiditis (HT and some are common to both the diseases, indicating that there is a shared genetic susceptibility to GD and HT. The putative GD and HT susceptibility genes include both immune modifying genes (e.g. HLA, CTLA-4 and thyroid specific genes (e.g. TSHR, Tg. Most likely, these loci interact and their interactions may influence disease phenotype and severity.

  19. Quality by design approach for developing chitosan-Ca-alginate microspheres for colon delivery of celecoxib-hydroxypropyl-β-cyclodextrin-PVP complex.

    Science.gov (United States)

    Mennini, N; Furlanetto, S; Cirri, M; Mura, P

    2012-01-01

    The aim of the present work was to develop a new multiparticulate system, designed for colon-specific delivery of celecoxib for both systemic (in chronotherapic treatment of arthritis) and local (in prophylaxis of colon carcinogenesis) therapy. The system simultaneously benefits from ternary complexation with hydroxypropyl-β-cyclodextrin and PVP (polyvinylpyrrolidone), to increase drug solubility, and vectorization in chitosan-Ca-alginate microspheres, to exploit the colon-specific carrier properties of these polymers. Statistical experimental design was employed to investigate the combined effect of four formulation variables, i.e., % of alginate, CaCl₂, and chitosan and time of cross-linking on microsphere entrapment efficiency (EE%) and drug amount released after 4h in colonic medium, considered as the responses to be optimized. Design of experiment was used in the context of Quality by Design, which requires a multivariate approach for understanding the multifactorial relationships among formulation parameters. Doehlert design allowed for defining a design space, which revealed that variations of the considered factors had in most cases an opposite influence on the responses. Desirability function was used to attain simultaneous optimization of both responses. The desired goals were achieved for both systemic and local use of celecoxib. Experimental values obtained from the optimized formulations were in both cases very close to the predicted values, thus confirming the validity of the generated mathematical model. These results demonstrated the effectiveness of the proposed jointed use of drug cyclodextrin complexation and chitosan-Ca-alginate microsphere vectorization, as well as the usefulness of the multivariate approach for the preparation of colon-targeted celecoxib microspheres with optimized properties. Copyright © 2011 Elsevier B.V. All rights reserved.

  20. Acute toxicity, bioaccumulation and effects of dietary transfer of silver from brine shrimp exposed to PVP/PEI-coated silver nanoparticles to zebrafish.

    Science.gov (United States)

    Lacave, José María; Fanjul, Álvaro; Bilbao, Eider; Gutierrez, Nerea; Barrio, Irantzu; Arostegui, Inmaculada; Cajaraville, Miren P; Orbea, Amaia

    2017-09-01

    The extensive use and release to the aquatic environment of silver nanoparticles (NPs) could lead to their incorporation into the food web. Brine shrimp larvae of 24h showed low sensitivity to the exposure to PVP/PEI-coated Ag NPs (5nm), with EC 50 values at 24h of 19.63mgAgL -1 , but they significantly accumulated silver after 24h of exposure to 100μgL -1 of Ag NPs. Thus, to assess bioaccumulation and effects of silver transferred by the diet in zebrafish, brine shrimp larvae were exposed to 100ngL -1 of Ag NPs as an environmentally relevant concentration or to 100μgL -1 as a potentially effective concentration and used to feed zebrafish for 21days. Autometallography revealed a dose- and time-dependent metal accumulation in the intestine and in the liver of zebrafish. Three-day feeding with brine shrimps exposed to 100ngL -1 of Ag NPs was enough to impair fish health as reflected by the significant reduction of lysosomal membrane stability and the presence of vacuolization and necrosis in the liver. However, dietary exposure to 100μgL -1 of Ag NPs for 3days did not significantly alter gene transcription levels, neither in the liver nor in the intestine. After 21days, biological processes such as lipid transport and localization, cellular response to chemical stimulus and response to xenobiotic stimulus were significantly altered in the liver. Overall, these results indicate an effective dietary transfer of silver and point out to liver as the main target organ for Ag NP toxicity in zebrafish after dietary exposure. Copyright © 2017 Elsevier Inc. All rights reserved.

  1. Inherited susceptibility and radiation exposure

    Energy Technology Data Exchange (ETDEWEB)

    Little, J.B. [Harvard School of Public Health, Boston, MA (United States)

    1997-03-01

    There is continuing concern that some people in the general population may have genetic makeups that place them at particularly high risk for radiation-induced cancer. The existence of such a susceptible subpopulation would have obvious implications for the estimation of risks of radiation exposure. Although it has been long known that familial aggregations of cancer do sometimes occur, recent evidence suggests that a general genetic predisposition to cancer does not exist; most cancers occur sporadically. On the other hand, nearly 10% of the known Mendelian genetic disorders are associated with cancer. A number of these involve a familial predisposition to cancer, and some are characterized by an enhanced susceptibility to the induction of cancer by various physical and chemical carcinogens, including ionizing radiation. Such increased susceptibility will depend on several factors including the frequency of the susceptibility gene in the population and its penetrance, the strength of the predisposition, and the degree to which the cancer incidence in susceptible individuals may be increased by the carcinogen. It is now known that these cancer-predisposing genes may be responsible not only for rare familial cancer syndromes, but also for a proportion of the common cancers. Although the currently known disorders can account for only a small fraction of all cancers, they serve as models for genetic predisposition to carcinogen-induced cancer in the general population. In the present report, the author describes current knowledge of those specific disorders that are associated with an enhanced predisposition to radiation-induced cancer, and discusses how this knowledge may bear on the susceptibility to radiation-induced cancer in the general population and estimates of the risk of radiation exposure.

  2. pitting corrosion susceptibility pitting corrosion susceptibility of aisi ...

    African Journals Online (AJOL)

    eobe

    Abstract. The susceptibility of austenitic (AISI 301) stainless steel to pitting corrosion was evaluated in sodium chloride. (NaCl) solutions ... AISI 301 steel suffers from pitting corrosion in all the investigated solutions. AISI 301 steel suffers from ..... [1] Ijeomah, M.N.C. Elements of Corrosion and Protection. Theory, Auto Century ...

  3. Magnetic Susceptability Measurements in Superconductors

    Science.gov (United States)

    Kim, Jason; Mallory, Kendall; Seim, Ryan

    2000-04-01

    A new undergraduate research facility in magnetic susceptability measurements on superconductors is being developed at the University of Northern Colorado. Initial data measurements of the magnetic susceptability of various superconductors will be presented. These measurements were obtained with a liquid helium/nitrogen dewar that was reassembled for use in this project. The cryostat consists of two separate dewars, the first of which contains liquid nitrogen, the second, liquid helium. The liquid nitrogen dewar is used to keep the helium bath from evaporating off too quickly. Data on the evaporation rates of the two liquids will also be presented.

  4. 38 CFR 19.2 - Composition of the Board; Titles.

    Science.gov (United States)

    2010-07-01

    ... 38 Pensions, Bonuses, and Veterans' Relief 2 2010-07-01 2010-07-01 false Composition of the Board; Titles. 19.2 Section 19.2 Pensions, Bonuses, and Veterans' Relief DEPARTMENT OF VETERANS AFFAIRS....2 Composition of the Board; Titles. (a) The Board consists of a Chairman, Vice Chairman, Deputy Vice...

  5. 36 CFR 901.1 - Title and office.

    Science.gov (United States)

    2010-07-01

    ... Section 901.1 Parks, Forests, and Public Property PENNSYLVANIA AVENUE DEVELOPMENT CORPORATION BYLAWS OF THE CORPORATION § 901.1 Title and office. (a) Title. The name of the Corporation is the Pennsylvania Avenue Development Corporation. (b) Office. The office of the Corporation shall be in the city of...

  6. 12 CFR 611.1137 - Title VIII service corporations.

    Science.gov (United States)

    2010-01-01

    ... 12 Banks and Banking 6 2010-01-01 2010-01-01 false Title VIII service corporations. 611.1137 Section 611.1137 Banks and Banking FARM CREDIT ADMINISTRATION FARM CREDIT SYSTEM ORGANIZATION Service... authorities granted under title VIII of the Act to act as an agricultural mortgage marketing facility. (b) How...

  7. 24 CFR 27.45 - Transfer of title and possession.

    Science.gov (United States)

    2010-04-01

    ... 24 Housing and Urban Development 1 2010-04-01 2010-04-01 false Transfer of title and possession... Foreclosure of Multifamily Mortgages § 27.45 Transfer of title and possession. (a) If the Secretary is the... deed to the purchaser upon receipt of the entire purchase price and execution by the Secretary and the...

  8. Evaluation Report, Brookville EEE Program, ESEA Title I, Summer, 1970.

    Science.gov (United States)

    Morgan, Don L.

    Contained in this report is an evaluation of the ESEA Title I Environmental-Ecological Education Program for educationally disadvantaged students operated by the Brookville Area School District, Pennsylvania. The program is a modification of a previously operated ESEA Title III Rural Youth Enrichment Program. Conducted during the summer of 1970,…

  9. The ties that bind: what's in a title?

    Science.gov (United States)

    Neuhaus, Susan J

    2017-05-04

    Many Australian and New Zealand surgeons use the title 'Mister' rather than 'Doctor', a practice dating back to traditions established over 600 years ago. The Royal Australasian College of Surgeons is currently undergoing a period of critical self-reflection, embodied by its 'Respect' campaign. Active measures to embrace diversity and encourage women into surgery are underway. This paper reviews the historical basis to the use of gendered titles and their current use amongst fellows. De-identified demographic data from the college register of active fellows was searched by self-identified title, country or state, and gender. Data were further reviewed by surgical sub-specialty and year of fellowship. The college dataset suggests that there is significant variance in the preference for gendered titles, determined predominantly by geography rather than specialty. The highest use of gendered titles (by male and female surgeons) was in Victoria/Tasmania (58% male, 22% female) and New Zealand (81% male, 17% female). By contrast, only 2% of female surgeons in other states elected a gendered title (Miss/Mrs/Ms). Surgery is the only profession that continues to use gendered titles. As the College of Surgeons moves towards greater equity and diversity, consideration should be given to phasing out the use of gendered titles, which serve to divide rather than unite our profession. © 2017 Royal Australasian College of Surgeons.

  10. 1990 Clean Air Act Amendment Summary: Title I

    Science.gov (United States)

    This page provides an overview of the 1990 amendments to Title I of the Clean Air Act, which were enacted to curb acid rain, urban air pollution and toxic air emissions. The edits to this title deal with the national ambient air quality standards.

  11. 24 CFR 234.65 - Nature of title.

    Science.gov (United States)

    2010-04-01

    ... 24 Housing and Urban Development 2 2010-04-01 2010-04-01 false Nature of title. 234.65 Section 234.65 Housing and Urban Development Regulations Relating to Housing and Urban Development (Continued... OWNERSHIP MORTGAGE INSURANCE Eligibility Requirements-Individually Owned Units § 234.65 Nature of title. A...

  12. 1990 Clean Air Act Amendment Summary: Title VI

    Science.gov (United States)

    This page provides an overview of the 1990 amendments to Title VI of the Clean Air Act, which were enacted to curb acid rain, urban air pollution and toxic air emissions. The edits to this title deal with stratospheric ozone and global climate protection.

  13. Examining ambiguities in film titles: the Nigerian situation | Nwala ...

    African Journals Online (AJOL)

    The paper investigated ambiguous film titles with specific reference to films in Nigeria. It observed that film titles which are meant to serve as initial appraisal and forerunners of films that light up the interest of the consumers and promote patronage are usually scripted in mind-boggling ambiguous expressions, which make ...

  14. Review Article - Book title: Oral tradition as history | Mbakwe ...

    African Journals Online (AJOL)

    Review Article - Book title: Oral tradition as history. ... International Journal of Development and Management Review. Journal Home ... Abstract. BOOK TITLE: ORAL TRADITION AS HISTORY MBAKWE, PAUL UCHE Department of History and International Relations, Abia State University P. M. B. 2000 Uturu, Nigeria.

  15. [The title of master in the history of health care].

    Science.gov (United States)

    Piasek, G; Piasek, M

    1999-09-01

    The review examples of usage of the Latin term magister (master) in various common titles throughout the past, particularly in Croatia. As early as the Roman Empire and until the Middle Ages, the title magister designated various functions and duties, generally denoting authority, higher rank, or a responsible position. The review highlights certain historical events and persons related to the usage of the title magister. Ever since the Middle Ages, the title has specifically denoted various health care professions. The term was used in Latin, as it was the official language in Croatia at the time, for example, m. chirurgiae (master of surgery), m. obstetritiae (master of obstetrics), m. artis occularis (master of the eye-related skills), m. hospitalis (master of the hospice), m. sanitatis (health care master). As an example, the review shows the difference between the titles doctor medicinae and m. obstetritiae according to John the Baptist Lalangue (1743-1799), the official physician of the Varazdin county in the Hapsburg Empire and one of the most prominent figures in the history of health care in Croatia. Lalangue was the author of the first professional medical book in the Croatian language published in 1776 and of several other books in Croatian. The books were meant to teach medical professionals and ordinary people how to improve their health. Beside the title of medical doctor, Lalangue held the title of m. obstetritiae which he earned through additional education. He thought it was essential for a complete health provider to be trained both in general practice and in obstetrics which, at the time, included infant care. Nowadays in Croatia, only persons who are graduate pharmacists use magister pharmaciae as a professional title. The title is otherwise strictly reserved to denote an academic degree between the bachelor's and the doctoral in a particular field. The title magister scientiarum (Master of Science) is achieved upon completion of a postgraduate

  16. Topological susceptibility from the overlap

    DEFF Research Database (Denmark)

    Del Debbio, Luigi; Pica, Claudio

    2003-01-01

    The chiral symmetry at finite lattice spacing of Ginsparg-Wilson fermionic actions constrains the renormalization of the lattice operators; in particular, the topological susceptibility does not require any renormalization, when using a fermionic estimator to define the topological charge. Theref...

  17. The Relationship between Standardized Test Scores of Socioeconomically Disadvantaged Students in Title I and Non-Title I Schools

    Science.gov (United States)

    Heier, Sharon L.

    2011-01-01

    Federal Title I funding has been allocated to districts since 1965 in an effort to provide schools with a high population of identified low socioeconomic students with additional resources to close the achievement gap. The basis for this study was to ascertain whether the Title I funding that schools received was having a positive impact on…

  18. 76 FR 62148 - Title VI; Proposed Circular, Environmental Justice; Proposed Circular

    Science.gov (United States)

    2011-10-06

    ... Federal Transit Administration Title VI; Proposed Circular, Environmental Justice; Proposed Circular... information sessions, as published in the September 29, 2011, Federal Register Notices titled ``Title VI... sessions, as published in the September 29, 2011, Federal Register Notices titled ``Title VI; Proposed...

  19. Inscribing Authority: Female Title Bearers in Jewish Inscriptions

    Directory of Open Access Journals (Sweden)

    Carrie Duncan

    2012-02-01

    Full Text Available This paper investigates representations of gender in the material culture of the ancient synagogue. The pertinent data are numerous dedicatory and funerary inscriptions linking individual Jews, men and women, with titles seemingly associated with leadership in Late Antique synagogues (ca. 200–600 CE. Bernadette Brooten’s influential 1982 monograph argued against the prevailing tendency to characterize these titles as indications of power, authority, and responsibility when associated with men but as meaningless flattery when applied to women. She suggests that synagogue titles denote power, authority and responsibility on all title bearers equally, both men and women. I question the continued utility of proffering female title-holders as enumerable examples of powerful women rescued from their forgotten place in history. Using theoretical insights developed by historians Elizabeth Clark and Gabrielle Spiegel, this paper will engage a comparative analysis with the work of Riet van Bremen and Saba Mahmood to develop new methods of conceptualizing women’s authority in early Jewish communities. I propose that viewing women’s synagogue titles as culturally constructed representations allows for a fruitful inquiry into how women’s titles were used by male-dominated synagogue communities in their self-articulation and public presentation of Judaism.

  20. PVP-coated, negatively charged silver nanoparticles: A multi-center study of their physicochemical characteristics, cell culture and in vivo experiments

    Directory of Open Access Journals (Sweden)

    Sebastian Ahlberg

    2014-11-01

    Full Text Available PVP-capped silver nanoparticles with a diameter of the metallic core of 70 nm, a hydrodynamic diameter of 120 nm and a zeta potential of −20 mV were prepared and investigated with regard to their biological activity. This review summarizes the physicochemical properties (dissolution, protein adsorption, dispersability of these nanoparticles and the cellular consequences of the exposure of a broad range of biological test systems to this defined type of silver nanoparticles. Silver nanoparticles dissolve in water in the presence of oxygen. In addition, in biological media (i.e., in the presence of proteins the surface of silver nanoparticles is rapidly coated by a protein corona that influences their physicochemical and biological properties including cellular uptake. Silver nanoparticles are taken up by cell-type specific endocytosis pathways as demonstrated for hMSC, primary T-cells, primary monocytes, and astrocytes. A visualization of particles inside cells is possible by X-ray microscopy, fluorescence microscopy, and combined FIB/SEM analysis. By staining organelles, their localization inside the cell can be additionally determined. While primary brain astrocytes are shown to be fairly tolerant toward silver nanoparticles, silver nanoparticles induce the formation of DNA double-strand-breaks (DSB and lead to chromosomal aberrations and sister-chromatid exchanges in Chinese hamster fibroblast cell lines (CHO9, K1, V79B. An exposure of rats to silver nanoparticles in vivo induced a moderate pulmonary toxicity, however, only at rather high concentrations. The same was found in precision-cut lung slices of rats in which silver nanoparticles remained mainly at the tissue surface. In a human 3D triple-cell culture model consisting of three cell types (alveolar epithelial cells, macrophages, and dendritic cells, adverse effects were also only found at high silver concentrations. The silver ions that are released from silver nanoparticles may be