Scopus is an abstract and citation database of research literature and quality web sources, including journals, conference proceedings, trade publications, abstracts, and patent records. It is a multidisciplinary resource covering materials from the humanities, sciences and social sciences. Also indexes EMBASE articles. Scopus allows you to locate the most highly cited items and the articles that cite them.
Date Coverage: 1970-present; selected access back to 1823
IOPscience is an online service for all journal content published by the Institute of Physics. It contains more than 300,000 articles, from 1874 to the present day. Also includes pre-prints from eprintweb.org (a free service, based on the arXiv.org at Cornell University), and editorial and news from IOP community websites.
Full-text access to IET/IEE (Institution of Engineering and Technology) Journals and IEEE (Institute of Electrical and Electronics Engineers) transactions, journals, magazines, and conference proceedings published since 1988 and all current IEEE standards.
The National Library of Medicine's digital archive of biomedical and life sciences journal literature, providing free access to the full text of articles. Includes a growing number of final, peer-reviewed author manuscripts by scientists who receive research funding from NIH and other funding agencies, in addition to articles from journals that deposit their content in the archive. Frequently confused with PubMed
SciFinder Scholar is a comprehensive chemistry database of chemical and chemical engineering literature including patents (1907 - date, with selected coverage back to 1878) and the CAS Registry with information on 18 million substances. Also useful for biotechnology, toxicology, environmental science, medicine, food science and nuclear science and general chemistry.