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1、NetworkDynamicsandFieldEvolution:TheGrowthofInterorganizationalCollaborationintheLifeSciencesAuthor(s):Walter W. Powell,Douglas R. White,Kenneth W. Koput,andJason Owen‐SmithSource:AmericanJournalofSociology,Vol.110,No.4(January2005),pp.1132-1205Publishedby:TheUniversityofChicagoPressStableURL:h
2、ttp://www.jstor.org/stable/10.1086/421508.Accessed:19/10/201310:52YouruseoftheJSTORarchiveindicatesyouracceptanceoftheTerms&ConditionsofUse,availableat.http://www.jstor.org/page/info/about/policies/terms.jsp.JSTORisanot-for-profitservicethathelpsscholars,researchers,andstudentsdiscover,use,andb
3、uilduponawiderangeofcontentinatrusteddigitalarchive.Weuseinformationtechnologyandtoolstoincreaseproductivityandfacilitatenewformsofscholarship.FormoreinformationaboutJSTOR,pleasecontactsupport@jstor.org..TheUniversityofChicagoPressiscollaboratingwithJSTORtodigitize,preserveandextendaccesstoAmer
4、icanJournalofSociology.http://www.jstor.orgThiscontentdownloadedfrom121.33.190.136onSat,19Oct201310:52:10AMAllusesubjecttoJSTORTermsandConditionsNetworkDynamicsandFieldEvolution:TheGrowthofInterorganizationalCollaboration1intheLifeSciencesWalterW.PowellDouglasR.WhiteStanfordUniversityandUnivers
5、ityofCalifornia,SantaFeInstituteIrvine,andSantaFeInstituteKennethW.KoputJasonOwen-SmithUniversityofArizonaUniversityofMichiganArecursiveanalysisofnetworkandinstitutionalevolutionisofferedtoaccountforthedecentralizedstructureofthecommercialfieldofthelifesciences.Fouralternativelogicsofattachmenta
6、ccumu-lativeadvantage,homophily,follow-the-trend,andmulticonnectiv-ityaretestedtoexplainthestructureanddynamicsofinteror-ganizationalcollaborationinbiotechnology.Usingmultiplenovelmethods,theauthorsdemonstratehowdifferentrulesforaffiliationshapenetworkevolution.Commercializationstrategiespursued
7、byearlycorporateentrantsaresupplantedbyuniversities,researchinstitutes,venturecapital,andsmallfirms.Asorganizationsincreasetheircollaborativeactivitiesanddiversifytheirtiestoothers,co-hesivesubnetworksform,characterizedbymultiple,i
