From the site: "BioCyc is a collection of 16,822 Pathway/Genome Databases (PGDBs), plus software tools for exploring them".
Focuses on the literature in chemistry. It is produced and published by CAS: Chemical Abstracts Service, a division of the American Chemical Society. In addition to including Medline and Chemical Abstracts, it includes chemical identification and chemical reaction exploration tools as well as a chemical supplier/catalog database that can be used to find sources for reagents and compare prices for different sources.
Registration information for CAS SciFinder.
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Resource that evaluates a journal's influence and impact based on citation data, otherwise known as the journal impact factor. Released annually, typically in June or July.