PubMed contains abstracts and full-text life sciences journal articles, biomedical literature, and books. Subjects covered include health, biomedicine, behavioral sciences, chemical sciences, and bioengineering.
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.