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The central angle is also known as the arc's angular distance. The arc length spanned by a central angle on a sphere is called spherical distance. The size of a central angle Θ is 0° < Θ < 360° or 0 < Θ < 2π (radians). When defining or drawing a central angle, in addition to specifying the points A and B, one must specify whether the ...
PubMed Central. PubMed 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.
PubMed Central (PMC) [13] Biomedical, life sciences: 7,500,000 Free full-text archive of publications and preprints Free Yes NIH, NLM: ResearchGate: Multidisciplinary: 4,000,000 [citation needed] Commercial social networking site for scientists and researchers. Over 19 million registered users that share their articles, datasets and other ...
PubMed is an excellent starting point for locating peer-reviewed medical literature reviews on humans from the last five years. It offers a free search engine for accessing the MEDLINE database of biomedical research articles offered by the National Library of Medicine at the U.S. National Institutes of Health. [32]
A PMID (PubMed identifier or PubMed unique identifier) [35] is a unique integer value, starting at 1, assigned to each PubMed record. A PMID is not the same as a PMCID (PubMed Central identifier) which is the identifier for all works published in the free-to-access PubMed Central .
The NIH Public Access Policy is an open access mandate, drafted in 2004 and mandated in 2008, [1] requiring that research papers describing research funded by the National Institutes of Health must be available to the public free through PubMed Central within 12 months of publication. PubMed Central is the self-archiving repository in which ...
The degree of curvature is defined as the central angle to the ends of an agreed length of either an arc or a chord; [1] various lengths are commonly used in different areas of practice. This angle is also the change in forward direction as that portion of the curve is traveled. In an n -degree curve, the forward bearing changes by n degrees ...
Entrez Global Query is an integrated search and retrieval system that provides access to all databases simultaneously with a single query string and user interface. Entrez can efficiently retrieve related sequences, structures, and references. The Entrez system can provide views of gene and protein sequences and chromosome maps.