science-articles
PubMed / PMC (NCBI E-utilities)
The US National Institutes of Health's index of biomedical literature, covering roughly 37 million citations plus about 10 million full-text articles in PubMed Central. You search the corpus through NCBI's E-utilities, which return results without an API key. It is the standard first stop for medical, clinical, and life-sciences literature.
Por qué es útil y cómo funciona
PubMed is the authoritative index of biomedical and life-sciences literature maintained by the US National Library of Medicine, and the standard starting point for medical and clinical research. You can search it by keyword, author, journal, MeSH term, or PubMed ID; papers indexed here link through to free full text in PubMed Central when available. Echo queries the NCBI E-utilities API on your behalf, returning the same results you would get searching pubmed.ncbi.nlm.nih.gov directly.
Qué contiene
Over 40 million citations from MEDLINE, life-science journals, and online books. PubMed Central holds more than 11 million linked full-text articles, most with a matching PubMed record.
Acceso por API
https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=pubmed&term=...&retmode=json
Acceso
Programmatic API access (a key may be required, see the API tag).