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The main academic full-text databases are open archives or link-resolution services, although others operate under different models such as mirroring or hybrid publishers. Such services typically provide access to full text and full-text search, but also metadata about items for which no full text is available.
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. 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.
Central America[ b ] is a subregion of North America. [ 2 ] Its political boundaries are defined as bordering Mexico to the north, Colombia to the southeast, the Caribbean Sea to the east, and the Pacific Ocean to the southwest. Central America is usually defined as consisting of seven countries: Belize, Costa Rica, El Salvador, Guatemala ...
Website. ncbi.nlm.nih.gov. The National Center for Biotechnology Information (NCBI) [1][2] is part of the United States National Library of Medicine (NLM), a branch of the National Institutes of Health (NIH). It is approved and funded by the government of the United States. The NCBI is located in Bethesda, Maryland, and was founded in 1988 ...
BioMed Central (BMC) is a United Kingdom-based, for-profit scientific open access publisher that produces over 250 scientific journals. All its journals are published online only. BioMed Central describes itself as the first and largest open access science publisher. It was founded in 2000 and has been owned by Springer, now Springer Nature ...
The Pan American approach is a part of PAHO history and the spirit of panamericanism continues to stimulate technical cooperation among countries in health. PAHO has helped countries work together toward common goals, and to initiate multi-country health ventures in Central America, the Caribbean, the Andean Region, and the Southern Cone.
History of Central America. 20th century political map of Central America. Central America is commonly said to include Guatemala, Belize, El Salvador, Honduras, Nicaragua, Costa Rica, and Panama. This definition matches modern political borders. Central America begins geographically in Mexico, at the Isthmus of Tehuantepec, Mexico's narrowest ...