topics covered include clinical and experimental medicine; microbiology; pathology; pharmacology; physiology; reproductive biology; toxicology; and veterinary medicine.
Coverage Dates: 1950 - present

The web version of Science Citation Index (SCI) and Social Science Citation Index (SSCI). The Web of Science accesses a multidisciplinary database of topics include all science disciplines, includes cited reference searching
Coverage Dates: 1970 - present

covers environmental sciences topics, and contains a subset of databases that focus on microorganisms, microbial degradation, antibiotic activity and production, microbial toxins, soil microorganisms and environmental pollution.
Coverage Dates: 1967 - present

covers agriculture topics
Coverage Dates: 1970 - present

covers microorganisms, microbial degradation, antibiotic activity and production, microbial toxins, soil microorganisms and environmental pollution.
Coverage Dates: 1982 - present

covers bacteriology, including methodology, taxonomy, cell structure and function, antibiotics, antibacterial agents, and medical, animal and invertebrate bacteriology.
Coverage Dates: 1982 - present

covers all aspects of chemistry, requires free registration before you can begin to search.
Coverage Dates: 1907 - present