Digital object identifierA digital object identifier (DOI) is a persistent identifier, or persistent handle, used to uniquely identify various objects, standardized by the International Organization for Standardization (ISO). DOIs are an implementation of the Handle System; they also fit within the URI system (Uniform Resource Identifier). They are widely used to identify academic, professional, and government information, such as journal articles, research reports, data sets, and official publications. A DOI aims to resolve to its targ...
X-Factor (comics)X-Factor is a group of mutantsuperheroes appearing in American comic books published by Marvel Comics. Publication historyOriginal team (1986–1991)X-Factor launched in 1986 featuring a team composed of the five original X-Men that debuted in X-Men #1 (1963): Angel – A millionaire heir, capable of flight by means of two feathery wings extending from his back.Beast – A brilliant scientist possessing bestial strength and agility.Cyclops – Former X-Men team leader, with the ability to emit powerful "optic bl...
PubMed CentralPubMed Central (PMC) is a free digital repository that archives open access full-text scholarly articles that have been published in biomedical and life sciences journals. As one of the major research databases developed by the National Center for Biotechnology Information (NCBI), PubMed Central is more than a document repository. Submissions to PMC are indexed and formatted for enhanced metadata, medical ontology, and unique identifiers which enrich the XML structured data for each article. Content within PMC c...*As an Amazon Associate I earn from qualifying purchases.