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The journals are grouped into four main sections: Physical Sciences and Engineering; Life Sciences; Health Sciences; Social Sciences and Humanities.; Article abstracts are freely available, and access to their full texts (in PDF and, for newer publications, also HTML) generally requires a subscription or pay-per-view purchase unless the content is freely available in open access.
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).
Contains more than 1,500,000 full-text articles and 4,200 journals covering all academic disciplines and different languages. Provides full-text article search, RSS feeds and a mobile application to access the literature. Free Paperity: Philosophy Documentation Center eCollection: Applied ethics, Philosophy, Religious studies
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.
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 ...
SciELO (Scientific Electronic Library Online) is a bibliographic database, digital library, and cooperative electronic publishing model of open access journals.SciELO was created to meet the scientific communication needs of developing countries and provides an efficient way to increase visibility and access to scientific literature. [2]
PNAS was established by the National Academy of Sciences (NAS) in 1914, [note 1] [8] [9]: 30 with its first issue published in 1915. The NAS itself was founded in 1863 as a private institution, but chartered by the United States Congress, with the goal to "investigate, examine, experiment and report upon any subject of science or art."
Scientists report a new species of mussel named Vadumodiolus teredinicola. [106] Biologists report a new species of jellyfish named Santjordia pagesi. [107] 7 February. Reported science studies suggest that cosmic dust particles may have spread, in a process termed panspermia, life to Earth and elsewhere in the Universe. [108] [109]