Web of Science is the world's largest, high-quality interdisciplinary database back to 1965. All subject areas are covered, but the sciences are covered very well. WoS is easy to use, but it has many advanced features that make it an excellent tool for advanced researchers. See the Web of Science page for searching instructions.
You can search all these databases, or select only one.
Web of Science (Arts & Humanities Index, Science Citation Index, Social Sciences Index)
BIOSIS (the leading biological sciences database)
Current Contents (current awareness database covering more than 7,000 journals)
PubChem provides information on the biological activities of small molecules. PubChem is organized as three linked databases within the NCBI's Entrez information retrieval system. These are PubChem Substance, PubChem Compound, and PubChem BioAssay. PubChem also provides a fast chemical structure similarity search tool.
The Energy Citations Database contains bibliographic records for energy-related reports, conference papers, journal articles, books, dissertations, and patents from the Department of Energy and its predecessor agencies, the Energy Research and Development Administration and the Atomic Energy Commission.
HSDB is a toxicology data file focusing on the toxicology of potentially hazardous chemicals. It is enhanced with information on human exposure, industrial hygiene, emergency handling procedures, environmental fate, regulatory requirements, and related areas.
The American Chemical Society is a self-governed individual membership organization that consists of more than 158,000 members at all degree levels and in all fields of chemistry. The organization provides a broad range of opportunities for peer interaction and career development, regardless of professional or scientific interests.
Applied Science & Technology Abstracts is home to a comprehensive collection of content from a wide range of interdisciplinary fields within the applied sciences. Contains indexing and abstracts for around 800 publications back to 1983, and full text from more than 220 periodicals dating back to 1997.
The United States Department of Commerce National Technical Information Service (NTIS) serves as the largest central resource for government-funded scientific, technical, engineering, and business related information available today. Included are citations for more than 3 million publications in more than 350 subject areas.