There has been an increased interest in open source publishing as of late, and the U.S government has gotten involved recently with the creation of PubMed Central (through the National Center for Biotechnology Information and the National Library of Medicine) in 2000. PubMed Central is a digital archive of life science journal literature which offers free and complete access to the contents of approximately 50 peer-reviewed journals, such as Applied and Environmental Microbiology, Dynamic Medicine, and the Journal of Bacteriology. The search engine is fairly straightforward, as users may elect to enter author names, journal titles in full, or by keywords. All told, PubMed currently contains many thousands of articles, many of which will be of great interest to researchers and students in these fields. Perhaps the most crucial features of PubMed are summarized in this passage from their overview section, which remarks thusly: "It also makes it possible to integrate the literature with a variety of other information resources such as sequence databases and other factual databases that are available to scientists, clinicians, and everyone else interested in the life sciences. The intentional and serendipitous discoveries that such links might foster excite us and stimulate us to move forward."