• CAplus -
  >30 million documents
• MEDLINE -
  >17 million references

• >41 million organic and inorganic substances
• >60 million sequences (view latest numbers)

• >16 million single- and multi-step reactions

• >246,000 inventoried or regulated chemicals

• >26 million commercially available chemicals

CAplus - Journal articles and patent documents from chemistry and related sciences

• Proteomics
• Genomics
• Biochemistry
• Biochemical genetics
• Organic
• Macromolecular
• Applied
• Physical, inorganic, analytical

MEDLINE - Produced by NLM, and covers all areas in the broad field of biomedicine

Information about the many different types of substances, including:

• Synonyms
• Molecular formulas
• Nucleic acid and protein sequences
• Ring analysis data
• Structure diagrams
• Experimental and calculated property data

Reaction information consisting of:

• Structure diagrams for reactants and products
• CAS Registry Numbers for all reactants products, reagents, solvents, and catalysts
• Yields for many products
• Textual reaction information

Chemical substances that are regulated in key markets across the globe:

• Chemical names
• Synonyms
• Regulatory lists
• Chemical inventory status

Information about commercially available chemicals and their worldwide suppliers:

• CAS Registry Number 
• Supplier information

CAplus

• 1907 to present, plus more than 133,000 pre-1907 journal records and more than 1,250 records for U.S. patents issued from 1808-1859 
• More than 10,000 scientific journals
• Patents from 57 patent authorities
• Conference proceedings
• Technical reports
• Books
• Dissertations
• Reviews
• Meeting abstracts
• Electronic-only journals
• Web preprints

MEDLINE

• 1949 to present
• 4,800 biomedical journals
• 99% of references are from journal literature
• 1949-1965 from OLDMEDLINE database

• Complete coverage from 1957 to present
• Many substances back to the early 1900s
• New substances as identified by the CAS Registry System
• GenBank sequences
• Organic and inorganic substances including:
  - Alloys
  - Coordination compounds
  - Minerals
  - Mixtures
  - Polymers
  - Salts
  - Sequences

• 1840 to present
• Journals covered for Chemical Abstracts^TM since 1985
• Patents covered for CA from 1991 to present

• Originally from data in the 1985 TSCA inventory and supplements
• U.S. Government Federal Register 1778-1987
• 13 national inventories
• State lists

(view lists)

• >900 suppliers of commercial chemicals worldwide
• >1000 chemical catalogs

CAplus - 3,000 references daily

MEDLINE - 5 times per week