# Presentation: 912076

## PubMed Central

- Brooke Dine
- National Library of Medicine
- Medical Library Association Conference
- May 2004

## What is PubMed Central?

- PubMed Central (PMC) is the U.S. National Library of Medicine's free digital archive of biomedical and life sciences journal literature.
- PMC serves as a...
- a permanent archive
- a platform for enriched linking, analysis, and use of research reports and data
- one of many sources of full-text articles linked to PubMed/MEDLINE citations

## Access to PMC Content

- Free access to full-text articles and supporting data
- A journal may delay free access to its content
- Research articles are generally free in a year or less
- Non-research articles may have a delay of 6-24 months depending on the journal
- Full-text searching of current and back issue content via PMC Entrez
- Citations for articles included in PubMed
- Fully integrated with other Entrez databases – sequence data, taxonomy, books, etc.

## PMC Participation & Usage

- Currently, PMC includes:
- 150 life sciences journals
- over 300,000 articles, letters, etc.
- 700,000 unique users monthly
- 1.75 million full-text retrievals per month
- Total retrieval is nearly 4 million pages per month

## PMC Home Page

## PMC Journal List – Full List

## PMC Journal List – Tabbed List

## PMC and Open Access

- Deposit of Open Access (OA) content is subject to normal PMC standards and requirements
- OA source files can be downloaded by anyone:
- PMC-OAI service for full-text XML
- FTP service to download complete article packet – XML, images, PDF and supplemental data files
- OA simplifies distribution of content to collaborating archives
- Opens door for data mining and creation of innovative products by others
- Open Access may apply to an entire journal and its content or at the article-level when authors have retained the copyright

## Open Access Journals in PMC

- Open Access Journals in PMC:
- Amphibian and Reptile Conservation
- BioMed Central Journals
- PLoS Biology
- Journals in PMC which offer authors the option to publish open access articles:
- Nucleic Acids Research
- PNAS
- In October 2003, PMC began accepting individual open access articles from journals that do not participate in PMC on a routine basis.
- Science

## Open Access & Copyright

## Open Access & Copyright

## PubLink with Open Access

## Open Access TOC

## Open Access Articles

## Ahead of Print Articles

## Back Issue Digitization in PMC

- Create a complete digital archive of PMC journals
- Bring the collection to today’s     “if not online, it doesn’t exist” user
- Cover-to-cover digital copy of everything up to where journal began producing electronic copy
- Publisher gets free, unencumbered digital copy
- First complete archive, Bulletin of the Medical Library Association (1911), released in November 2003

## What’s Being Digitized?

- 50 journals that deposit current issues including:
- American Society for Microbiology (10 journals)
- BMJ Publishing Group (BMJ and specialist journals)
- Bulletin of the Medical Library Association
- Journal of Clinical Investigation
- Molecular Biology of the Cell
- Nucleic Acids Research
- Plant Physiology
- PNAS: Proceedings of the National Academy of Sciences of the USA

## Archive Table of Contents (TOC)

## Digitized Issue TOC

## Digitized Article – Summary

## Digitized Article – Page Browse

## Back Issue Digitized Images

## Back Issue Digitized Images

## Back Issue Digitized Images

## Entrez

- Entrez retrieval system supports access to PubMed, online books, the sequence databases, a taxonomy database, and more.
- Users can now search the full text of all SGML- or XML-based content deposited in PMC, including articles for which the full text is viewable only at the journal’s site.
- Back issue content is also searchable via PMC Entrez.

## PMC Entrez – Journal Limits

## PMC Entrez Limits

## PMC Entrez Results

## Linking Options within PMC

- Articles within PMC offer various linking options across articles, issues, and journals. These include:
- 	Commentaries
- 	Cited In
- 	Referenced Articles
- 	Corrections

## Linking: Commentary Articles

## Linking: Commentary Articles

## Cited In

## Cited In TOC

## Referenced Articles

## Linking: Corrected Articles

## Linking: Original Article

## PMC

- PubMed Central Site:
- _[http://www.pubmedcentral.nih.gov](http://www.pubmedcentral.nih.gov/)_
- Questions about PMC:
- pubmedcentral@nih.gov