Biological Abstracts contains abstracts and some full text of articles from peer reviewed journals. Subjects covered include biological and biomedical research, pharmacological studies, and discoveries of new organisms.
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.
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.
An international, peer-reviewed, open-access online publication for all scientific disciplines. Associated scientific content available at this site include PLoS Biology, PLoS Medicine, PLoS Genetics, PLoS Neglected Tropical Diseases, PLoS Pathogens, and PLoS Computational Biology.