La letteratura biomedica è rappresentata da milioni di abstracts disponibili nel database di Medline. L'interfaccia di PubMed fornisce un motore di ricerca che adotta un sistema di parole chiave booleano. Questo approccio evidenzia però dei limiti nel recupero degli abstracts relativi a temi molto specifici, in quanto è difficile per un utente non esperto trovare tutte le parole chiave più pertinenti relative ad un argomento biomedico. Per affrontare questo problema, di significato del testo, sono stati sviluppati strumenti che aiutano gli autori a sviluppare abstracts pertinenti. MedlineRanker web consente una certa flessibilità di graduatoria Medline per un argomento di interesse generale, senza conoscenze specifiche. Dati alcuni abstract relativi ad un argomento, il programma deduce automaticamente le parole più importanti rispetto ad una selezione casuale. Queste parole possono essere usate da altri autori di abstracts, permettendo di classificarli in base alla pertinenza. Questo strumento può essere estremamente preciso ed è in grado di elaborare milioni di abstracts in un lasso di tempo molto breve. MedlineRanker è gratuito ed è disponibile a http://cbdm.mdc-berlin.de/tools/medlineranker.
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