Backfile packages from Wiley and Elsevier were recently purchased that now give users access to the archive content of almost 400 titles. Many titles are now accessible back to the first issue.

Wiley backfile packages purchased include the following collections:
Biology
Cell and Developmental Biology
Earth and Environmental Sciences
General Medicine
Materials Science
Microbiology
Natural Sciences and Taxonomy
Neurology, Neurosurgery and Pain
Physics and Astronomy
Radiology
Surgery

Elsevier backfile packages purchased include the following collections:
Mathematics
Environmental Sciences
Immunology and Microbiology

ScienceDirect will be unavailable 9:00 PM EDT, Saturday, October 31 to 5:00 AM EST, Sunday November 1st  (1:00 AM GMT to 10:00AM GMT, Sunday November 1st)

We apologize for the inconvenience.

PubMed Central (PMC) is a free digital archive of biomedical and life sciences journal literature developed by the National Institutes of Health (NIH).  PMC is a stable repository to permanently preserve and maintain unrestricted access to electronic literature resulting from NIH funding.  PubMed Central is managed by the National Library of Medicine (NLM), and is accessible world-wide to health professionals, researchers, and the public.  

Effective April 7, 2008, articles resulting from NIH funding should be submitted to PubMed Central within 12 months of publication. The NIH Public Access Policy  should significantly enhance the collection of articles in PMC. Initially (in 2000), it included content from only two journals:  PNAS: Proceedings of the National Academy of Sciences and Molecular Biology of the Cell.  It now includes about 1,000,000 articles from a growing list of journals which deposit some or all of their content.  Each PMC article is marked in the PubMed database with a link to the full text.