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PubMed Central is a free digital archive of full articles, accessible to anyone from anywhere via a web browser (with varying provisions for reuse). Conversely, although PubMed is a searchable database of biomedical citations and abstracts, the full-text article resides elsewhere (in print or online, free or behind a subscriber paywall ).
A database of biomedical and life sciences literature with access to full-text research articles and citations. [56] Includes text-mining tools and links to external molecular and medical data sets. A partner in PMC International. [57] Free EMBL-EBI [58] FSTA – Food Science and Technology Abstracts: Food science, Food technology, Nutrition
As of the same date, 24.6 million of PubMed's records are listed with their abstracts, and 26.8 million records have links to full-text versions (of which 10.9 million articles are available, full-text for free). [8] Over the last 10 years (ending 31 December 2019), an average of nearly one million new records were added each year.
Access to the full-text pdfs of non-open access publications require either a subscription (to the specific journal rather than to the whole database) or per-article/book payment. Subscriptions to the overall content hosted on ScienceDirect, rather than to specific titles, are usually acquired through what is called a big deal .
Europe PMC provides free access to more than 9.3 million full-text biomedical and life sciences research articles and over 43.3 million citations. [3] Europe PMC contains some citation information and includes text mining based marked up text that links to external molecular and medical datasets.
At the end of the process (December 2017), close to 5,000 journals, out of the 11,600 indexed in May 2016, had been removed from their database, in majority for failure to reapply. [ 4 ] [ 5 ] [ 6 ] Notwithstanding the substantial cleanup, the number of journals included in DOAJ has continued to grow, to reach 14,299 as of 3 March 2020. [ 7 ]
PubMed: biomedical literature citations and abstracts, including Medline—articles from (mainly medical) journals, often including abstracts. Links to PubMed Central and other full-text resources are provided for articles from the 1990s. PubMed Central: free, full-text journal articles; Site Search: NCBI web and FTP web sites; Books: online books
Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. . Released in beta in November 2004, the Google Scholar index includes peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other ...