LogGP in theory and practiceAn indepth analysis of modern interconnection networks.docx
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LogGP in theory and practiceAn indepth analysis of modern interconnection networks.docx
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LogGPintheoryandpracticeAnindepthanalysisofmoderninterconnectionnetworks
Polymericmaterialsforboneandcartilagerepair ReviewArticle
ProgressinPolymerScience,Volume35,Issue4,April2010,Pages403-440
D.Puppi,F.Chiellini,A.M.Piras,E.Chiellini
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Abstract
Thepastdecadehasseentherapiddevelopmentofnewstrategiesforthedesignofbiodegradablemacromolecularcompounds,withproperlysuitedarchitectureandtailoredproperties,functioningastemporarysupportfortheengineeringoflivingconstructsintissueregenerationapplications.Thepurposeofthispaperistoreviewrecentresearchintheinterdisciplinaryfieldoftissueengineering,withparticularregardtoboneandcartilagetissues,aimedatthedesign,synthesis,evaluationandcharacterizationofbioactivepolymericscaffoldsguidingandpromotingnewtissueingrowth.Currentstrategiesinscaffold-guidedtissueengineeringapproach,involvingthemostemployedbiodegradablepolymers,eitherofnaturalorsyntheticorigin,willbereportedunderlyingtheroleplayedbybothmaterialstructure–propertyrelationshipandscaffoldarchitecture.Whiletherearemanypolymericmaterialsthatmaybeemployedfortheregenerationofboneandcartilagetissue,wewillfocusspecificallyonthosethathavebeenmoreextensivelyapplied,showingpromisingoutcomes.Commonlyexploitedandinnovativeprocessingtechniquesforthefabricationofadvancedtissueengineeringscaffoldswillbeexplored,highlightingtheoreticalprinciplesandtheirpotentialincreatingmicro-nanostructuressuitablefortissueregenerationapplications.
ArticleOutline
1.Introduction
2.Boneandcartilagetissuedamageandtransplantation
2.1.Bonedefectstreatments
2.2.Cartilagedefectstreatments
2.3.Osteochondraldefectstreatments
3.Scaffold-guidedboneandcartilagetissueregeneration
3.1.Scaffoldrequirements
4.Polymericmaterialsemployedforscaffoldspreparation
4.1.Compositebioabsorbable/bioactivematerials
4.2.Polymersofnaturalorigin
4.2.1.Proteins
4.2.1.1.Collagen
4.2.1.2.Silkfibroin
4.2.2.Polysaccharides
4.2.2.1.Chitosananditsderivative
4.2.2.2.Hyaluronicacid
4.2.2.3.Alginates
4.2.2.4.Starch-basedmaterials
4.2.2.5.Cellulose
4.2.2.6.Dextrans
4.2.3.Microbialoriginpolyesters
4.3.Syntheticpolymers
4.3.1.Shortchainsaturatedaliphaticpolyesters
4.3.2.Poly(-caprolactone)
4.3.3.Bioresorbablepoly(urethane)s
4.3.4.Poly(propylenefumarate)
4.3.5.Polyphosphazenes
4.3.6.Poly(1,4-butylenesuccinate)
5.Techniquesforpolymericscaffoldspreparation
5.1.Solventcastingcombinedwithparticleleaching
5.2.Freezedrying
5.3.Supercritical-fluidtechnology
5.4.Phase-separationtechnology
5.5.Fiberbonding
5.6.Moldingtechniques
5.7.Solidfreeformfabrication
6.Conclusionsandoutlook
References
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Synthesisandstructureofunusuallystablelinearcopper(I)complexeswithbluefluorescence OriginalResearchArticle
Polyhedron,Volume25,Issue11,31July2006,Pages2269-2276
SandipBanthia,AnunaySamanta
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Anewfluorescentligand2-(4′-aminophthalimidoethyl)pyridine(L2)hasbeensynthesized.SolidstatestructuresofL2and2-(4′-aminophthalimidomethyl)pyridine(L1)havebeendeterminedbyX-raycrystallography.WhileL1crystallizesinthenon-centrosymmetricorthorhombicspacegroupFdd2,L2crystallizesinthemonoclinicspacegroupC2/c.ThemolecularpackinginbothsystemsisdominatedbyintermolecularN–HOandN–HNhydrogenbondsandrelativebendingoftheplanesdefinedbythepyridineandphthalimidemoieties.Anunusuallystabletwo-coordinatecomplexofcopper(I)withL2,Cu(L2)2,hasbeensynthesizeduponinsitureductionofcopper(II)atroomtemperature.Thiscomplex,whichhasbeencharacterizedbyX-raycrystallography,crystallizesinthecentrosymmetricspacegroupC2/cwithalinearN–Cu–Ngeometry.TheCu–Nbonddistance(1.89 Å)inCu(L2)2isfoundtobesimilartothatinCu(L1)2.Boththecomplexesdisplayinterestingstructuralfeature,arisingfromweakCuOinteractions(3.12 ÅinCu(L1)2and2.71 ÅinCu(L2)2)betweenthecopperandoxygenatomsofthecounteranion,leadingtoalinearnetworkwithalternateandCu+ions.A2-DnetworkdeterminedbyintermolecularN–HOhydrogenbondingisalsoobserved.Thesecomplexesarefoundtobehighlyresistanttowardoxidationbothinthesolidstateandinsolution.ThenewcomplexCu(L2)2,inwhichthemetalcenterismoreseparatedfromthe4-aminophthalimidemoieties,exhibitslesserstabilitythanCu(L1)2.Close
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