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The terms "free", "subscription", and "free & subscription" will refer to the availability of the website as well as the journal articles used. Furthermore, some programs are only partly free (for example, accessing abstracts or a small number of items), whereas complete access is prohibited (login or institutional subscription required).
Biological Abstracts is a database produced by Clarivate Analytics. It includes abstracts from peer-reviewed academic journal articles in the fields of biology , biochemistry , biotechnology , botany , pre-clinical and experimental medicine , pharmacology , zoology , agriculture , and veterinary medicine , and has been published since 1926.
PubMed is a free database including primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics. The United States National Library of Medicine (NLM) at the National Institutes of Health maintains the database as part of the Entrez system of information retrieval.
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).
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 ...
The informative abstract, also known as the complete abstract, is a compendious summary of a paper's substance and its background, purpose, methodology, results, and conclusion. [ 23 ] [ 24 ] Usually between 100 and 200 words, the informative abstract summarizes the paper's structure, its major topics and key points. [ 23 ]
Scientific publications on the World Wide Web (although e.g. scientific journals are now commonly published on the web). Books, technical reports , pamphlets, and working papers issued by individual researchers or research organizations on their own initiative; these are sometimes organized into a series.
Weed Abstracts, derived from CAB Abstracts, is an abstracts database focused on published research regarding weeds and herbicides. This includes weed biology , encompassing research areas from genetics to ecology , including parasitic , poisonous , allergenic and aquatic weeds.