• Drug-eluting stents

    Jul 15, 2010· Then, the PCI was moved toward to the third milestone, drug-eluting stents, in the early 2000s . A drug-eluting stent (DES), namely, a stent combined with a drug, is designed to prevent ISR through inhibition of smooth muscle cell (SMC) proliferation.

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  • IJMS | Free Full-Text | Bioresorbable Drug-Eluting ...

    The first generation of bioabsorbable metal scaffolds (AMS-1; Biotronik AG, Bülach, Switzerland) was made from a WE43 alloy, composed of 93% Mg and 7% rare earth elements . The AMS-1 was a tubular, slotted, balloon-expandable scaffold sculpted by laser from a tube of a bioabsorbable magnesium alloy without drug-elution.

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  • ANALYSIS OF RARE EARTHS IN EUDIALYTE

    Elution rates of the Rare Earths were determined by eluting through the column a sample of eudialyte of approximately 0.3 grams spiked with tracers of radio-active . La. 140 : and Yb . 175 • Since Yb is the first Rare Earth to come off the column and La is the last, it was possible to draw up elution curves for the Rare Earth elements.

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  • Mutual Separation of Rare Earths in Monazite with Cation ...

    Mutual separation of the individual rare earth elements (exception of cerium) in monazite from different districts was investigated by cation exchange elution method. Strong acid type cation exchange resin, Bio-Rad AG 50 Wx8 and eluting solution of a α-hydroxyisobutyric acid (α-HIBA) were used. Radioactivity tagged Eu-152, 154 or Tb-160 were ...

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  • Selective separation of rare earth elements by ion ...

    Jul 25, 2000· Selective separation of rare earth elements by ion exchange in an iminodiacetic resin . United States Patent 6093376 . Abstract: A method is disclosed to separate the heavy rare earth elements Lu through Sm plus Y by an ion-exchange process called selective elution. ... eluting rare earth elements with chelating agent in the separation column ...

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  • 1.1. Chemistry of Rare Earths - INFLIBNET

    1.1. Chemistry of Rare Earths Rare earth metals comprise of elements that are part of the lanthanides in the periodic table with atomic numbers 57-71. Scandium and yttrium are grouped with the lanthanide family because of their similar properties [1]. Rare earth elements are separated into three categories,

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  • Rare-earth element fractionation in uranium ore and its U ...

    Rare-earth element fractionation in uranium ore and its U(VI) alteration minerals Enrica Balbonia,b,∗, Antonio Simonettia, Tyler Spanoa, Nathaniel D. Cooka, Peter C. Burnsa,c a Department of Civil and Environmental Engineering and Earth Science, University of Notre Dame…

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  • Grouping separation of mixed rare earths from their ...

    Jan 18, 2019· A new approach was proposed for grouping separation of 14 lanthanide rare-earth ions from their co-existing mixed aqueous solutions, by performing liquid-column elution using the aqueous solution containing 14 lanthanide rare-earth ions as the stationary phase and the dispersed organic oil droplets containing P507 extractant as the mobile phase.

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  • Anion Exchange Resin Separation of the Rare Earths ...

    Separation of the rare earths by anion exchange in water-solvent mixtures in the presence of α-hydroxyisobutyric acid. Journal of Chromatography A 1967, 26, 232-238. DOI: 10.1016/S0021-9673(01)98858-2. J. Alstad, A.O. Brunfelt. Adsorption of the rare-earth elements on an anion-exchange resin from nitric acid-acetone mixtures.

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  • CN102041389A - Method for producing rare earth carbonate ...

    The invention discloses a method for producing rare earth carbonate by using recycled rare earth carbonate precipitation waste liquid, which comprises: preparing high-concentration inorganic acid solution of rare earth from rare earth carbonate precipitation supernate and forming 1.0 to 1.5 mol/l solution of rear earth chloride; preparing ammonium bicarbonate precipitator at a concentration of ...

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  • Rare Earth - I Know I'm Losing You (full version) - YouTube

    Feb 17, 2011· (I Know) I'm Losing You; Artist Rare Earth; Writers Norman Whitfield, Cornelius Grant, Edward Holland; Licensed to YouTube by UMG; SOLAR Music Rights Management, ARESA, LatinAutor - SonyATV, BMG ...

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  • Drug-Eluting Bioabsorbable Magnesium Stent | Request PDF

    Drug-Eluting Bioabsorbable Magnesium Stent. ... The ACR issue solution came from magnesium alloys extensively used in aerospace since the addition of low levels of rare-earth metal elements ...

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  • Development of a procedure for spectrophotometric ...

    Apr 20, 2019· The function of the retaining ion is to cause the redeposit ion of the rare earth elements on the resin bed and transport the chelating agent off the column in soluble form to obtain a better separation and resolutions of individual rare earths.The following reaction represents rare earth elements adsorption and elution through Cu(II) as shown ...

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  • Current Status on Resource and Recycling Technology for ...

    very few radioactive elements and is a superior rare earth resource because rare earth elements in the ores can be easily separated and extracted through elution using eluting agent such as an ammonium sulfate. However, ion adsorption-deposits have been discovered only in southern China and certain parts of …

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  • Rapid separation of heavy rare-earth elements.

    The U.S. Bureau of Mines investigated the separation of heavy rate-earth elements (REE) in an ion exchange process. An ion-exchange column consisting of two sections, a loading section and a separation section, provides high 1evels of REE loading and good REE separation with an expected processing cycle of less than a month, while current ion-exchange technology requires more than 5 …

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  • In Vivo and In Vitro Studies of Biodegradable WE43 Stent

    Magnesium alloys are very biocompatible and show promise for use in implant device. The focus of this article lies in the evaluation of the degradation performance and biological response of a paclitaxel-eluting biodegradable stent based on WE43 magnesium alloy by in vivo and in vitro studies. The corrosion characteristics analyzed by immersion testing in phosphate buffered solution (PBS) for 24h.

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  • Bioresorbable stent - Wikipedia

    Like metal stents, placement of a bioresorbable stent will restore blood flow and support the vessel through the healing process. However, in the case of a bioresorbable stent, the stent will gradually resorb and be benignly cleared from the body, enabling a natural reconstruction of the arterial wall and restoration of vascular function.

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  • InspireMD Announces Issuance of Two New U.S. Patents ...

    InspireMD Announces Issuance of Two New U.S. Patents Covering Proprietary MicroNet Stent Jacket and Related Drug Eluting Technology. Gabrielle Lakusta ... Rare Earth Investing. Scandium Investing.

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  • Optimisation of mass transfer in column elution of rare ...

    Request PDF on ResearchGate | Optimisation of mass transfer in column elution of rare earths from low grade weathered crust elution-deposited rare earth ore | An investigation was carried out to ...

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  • I ,I RARE-EARTH ANALYSIS BY A MASS SPECTROMETRIC …

    A technique for the analysis of rare-earth element abundances in rocks and minerals by mass spectrometric stable isotope dilution has been developed. The technique is being used at present for the routine analysis of europium and the seven even- atomic-number rare …

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  • The use of chelating agents in the separation of the rare ...

    The use of chelating agents in the separation of the rare earth elements by ion-exchange methods Abstract The research described in this thesis was undertaken in order to accomplish two main objectives. The first was to measure the stability of the complexes formed by each of the trivalent rare earth cations with

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  • Rapid separation of heavy rare-earth elements (Book ...

    Rare earth elements are eluted with 3N hydrochloric acid. Cerium is separated from the other rare earths by solvent extraction of its nitrate with methyl-iso-butyl ketone; both groups are determined gravimetrically. Thorium is eluted from themore »

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  • US6093376A - Selective separation of rare earth elements ...

    A method is disclosed to separate the heavy rare earth elements Lu through Sm plus Y by an ion-exchange process called selective elution. Mixed rare earths are saturated onto a loading column containing sulfonic resin. Iminodiacetic resin in a separation column is conditioned into the hydrogen and ammonium form before it is saturated with rare earth retaining ion.

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  • Welcome to CDC stacks | Rapid separation of heavy rare ...

    Bands of mixed REE eluting between separated bands of pure REE were recycled directly to the columns. Without mixed-band recycle, over 80% of the REE eluted from the column was separated into fractions with 99% purity of each element; with such recycle, the percentage of separated elements can be increased to around 90%." ... the rare earth ...

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  • Development of a method for measuring rare earth elements ...

    All rare earth elements are concentrated by approximately a factor of five through this eluting procedure. The eluted solution was collected and measured with the ICP-MS. The total time for the chemical separation and preconcentration procedure and the ICP-MS measurement was about one day.

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  • Rare Earth - I Just Want to Celebrate - YouTube

    Mar 13, 2008· Rare Earth - I Just Want to Celebrate Chadman2000. Loading... Unsubscribe from Chadman2000? Cancel Unsubscribe. Working... Subscribe Subscribed Unsubscribe 16.2K. Loading...

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  • (DOC) Selective separation of rare earth elements by ion ...

    A consequence of this is thatthe rare earth concentration eluted is not dependent on NH.sub.4 concentration, but on EDTA concentration. During rare earth elution, NH.sub.4 displaces hydrogen from the top of the separation column and then hydrogen will displace rare earth from lowerin the column.

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  • Separation of rare earth elements by high performance ...

    Jul 25, 2001· Separation of rare earth elements by high performance liquid chromatography using a covalent modified silica gel column. ... The eluting agent was chosen as HIBA, the influence of its concentration was studied by the injecting individual lanthanides and determining the retention times for some of them at different concentrations of HIBA at a ...

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  • Rare-earth element - Wikipedia

    A rare-earth element (REE) or rare-earth metal (REM), as defined by the International Union of Pure and Applied Chemistry, is one of a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides, as well as scandium and yttrium.

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  • Talk:Bioresorbable stent - Wikipedia

    Clinical research has shown that resorbable scaffolds, or naturally dissolving stents, offer comparable efficacy and safety profile to drug-eluting stents. Specifically, the Absorb naturally dissolving stent has been investigated in single-arm trials and in randomized trials comparing it to a drug-eluting stent (DES).

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  • Praseodymium - Wikipedia

    Praseodymium is a chemical element with the symbol Pr and atomic number 59. It is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals.Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties.It is too reactive to be found in native form, and pure praseodymium ...

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  • THE SEPARATION OF THE RARE EARTHS BY ION-EXCHANGE …

    on their clevelop111ent as eluting agents for the rare earth elements. These compounds are weak acids \vith "znritterion" or dual type ion formation causing considerable difference in the dissociation of the acid groups. \?Then partially neutl-alized, these acids readily for111 complex ions with most

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  • Rare earths and ion exchange (Conference) | OSTI.GOV

    The yttrium-- rare earth concentrates were obtained from Fergusonite ore, Gadolinite ore, and a by-product from an ion-exchange resin separation process. In each case the mixture in terms of oxide was composed of from 50 to 60% yttrium and 5 to 15% heavy rare earths with the light rare earth fraction constituting the remaining material.

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