SciFinder-n contains abstracts of journal articles, patent records, and literature on chemical and substance reactions. Subjects covered include chemistry, biochemistry, chemical engineering, materials science, and physics. Individual user registration is required. If you don't have an account with CAS, you'll need to create one. Please review the Terms and Conditions.
Science Direct contains abstracts and full-text articles from scientific, technological, and medical scholarly journals and reference books. Subjects covered include biology, chemistry, computer science, economics, environmental science, mathematics, medicine, neuroscience, nursing, physics, education, and psychology. Note that Science Direct only searches Elsevier journals.