lactide वाक्य
उदाहरण वाक्य
मोबाइल
- Two molecules of lactic acid can be dehydrated to lactide, a cyclic lactone.
- The sealant film is synthetic and incorporates absorbable polymers, including poly ( lactide-co-glycolide ).
- It is used as a monomer equivalent to lactic acid or lactide in the preparation of poly ( lactic acid ).
- This process needs to be carried out at less than 200 �C; above that temperature, the entropically favored lactide monomer is generated.
- This compound is more reactive than lactide, because its polymerization is driven by the loss of one equivalent of carbon dioxide per equivalent of lactic acid.
- A variety of catalysts can polymerise lactide to either heterotactic or syndiotactic polylactide, which as biodegradable polyesters with valuable ( inter alia ) medical properties are currently attracting much attention.
- For example, poly ( L-lactide ) ( PLA ), is used to make screws and darts for meniscal repair and is marketed under the trade name Clearfix Mensical Dart / Screw.
- Polymerization of a racemic mixture of L-and D-lactides usually leads to the synthesis of poly-DL-lactide ( "'PDLLA "'), which is amorphous.
- Apart from lactic acid and lactide, lactic acid " O "-carboxyanhydride ( " lac-OCA " ), a five-membered cyclic compound has been used academically as well.
- Depending on the ratio of lactide to glycolide used for the polymerization, different forms of PLGA can be obtained : these are usually identified in regard to the molar ratio of the monomers used ( e . g.
- Other brands of polyglycolic acid suture include PolySyn, Surgicryl, Polysorb and Dexon, all of which are manufactured by different companies . Vicryl is a copolymer of lactide ( a cyclic diester of lactic acid ) and glycoside.
- The melting temperature of PLLA can be increased by 40 50 �C and its heat deflection temperature can be increased from approximately 60 �C to up to 190 �C by physically blending the polymer with PDLA ( poly-D-lactide ).
- Some types of polymers being tested now are poly ( ethylene glycol ) ( PEG ), N-( 2-hydroxypropyl ) methacrylamide ( HPMA ), and poly ( lactide-co-glycolide ) ( PLGA ) copolymers have been successful in medical research.
- This has been demonstrated by coating biodegradable cationic microparticles ( such as poly ( lactide-co-glycolide ) formulated with cetyltrimethylammonium bromide ) with DNA . Such DNA-coated microparticles can be as effective at raising CTL as recombinant viruses, especially when mixed with alum.
- Example of routes to polyester formation using lactic acid . a ) Condensation of lactic acid into dimeric lactide followed by ring-opening polymerization of to form poly ( lactic acid ); b ) Direct condensation of lactic acid, demonstrating the need to continuously remove water from the system in order to drive the reaction forward.
- A 2011 study by El-Ayoubi et al . investigated " 3D-plotting technique to produce ( biocompatible and biodegradable ) poly-L-Lactide macroporous scaffolds with two different pore sizes " via solid free-form fabrication ( SSF ) with computer-aided-design ( CAD ), to explore therapeutic articular cartilage replacement as an " alternative to conventional tissue repair ".
- An example of a naturally dissolving stent is the'Absorb'stent'produced by Abbott that has several design components and features : "'base scaffold "': a poly ( L-lactide ) polymer similar to that in dissolvable stitches is shaped into a tube made up of zigzag hoops linked together by bridges; drug-eluting layer': a mixture of poly-D, L-lactide ( PDLLA ) and everolimus;'markers': a pair of radio-opaque platinum markers at the ends that allow the device to be visualized during angiography;'delivery system': a balloon delivery system.
- An example of a naturally dissolving stent is the'Absorb'stent'produced by Abbott that has several design components and features : "'base scaffold "': a poly ( L-lactide ) polymer similar to that in dissolvable stitches is shaped into a tube made up of zigzag hoops linked together by bridges; drug-eluting layer': a mixture of poly-D, L-lactide ( PDLLA ) and everolimus;'markers': a pair of radio-opaque platinum markers at the ends that allow the device to be visualized during angiography;'delivery system': a balloon delivery system.
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