Cited by pubmed central articles

Researchers, institutions and publishers have complied with the mandate, but it still has its opponents. One year on, advocates of free public access to scientific literature are calling a law that requires researchers at the US National Institutes of Health (NIH) to make their manuscripts publicly available at the PubMed Central repository a success. Click for larger imageSince the legal requirement that NIH-funded researchers make their manuscripts publicly available after acceptance for journal publication came into effect last April, the number of articles being approved by their authors for processing by the repository has more than tripled. The reason that the policy has succeeded at the NIH "is that there has been cooperation — whether they wanted to [comply] or not — by grantees, by extramural staff, by the universities and by publishers", says David Lipman, director of the NIH's National Center for Biotechnology Information in Bethesda, Maryland. Because of the delay of up to a year on NIH uploads to PubMed Central, it is difficult at this stage to gauge the impact of the policies on societies and other publishers that rely heavily on subscriptions for revenue. Heather Joseph, executive director of the Scholarly Publishing and Academic Resources Coalition (SPARC), an advocacy group in Washington DC with an open-access agenda, says that the consortium's members are reporting large-scale cuts in journal subscriptions.
But Martin Frank, executive director of the American Physiological Society in Bethesda, says that "in an environment where access is readily available whether after 12 months or 6 months or immediately, the subscription model starts wobbling". And last week, the formerly open-access Journal of Visualized Experiments (JoVE) abruptly switched to a subscription model, charging individuals $99 per month and larger institutions up to $2,400 per year.
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At the same time, the measure continues to be challenged by a senior congressman and some publishers. In March 2009, 6,425 such original articles were approved by their authors for processing; a year earlier, the number was 1,852 (see graph).
Britain's Wellcome Trust, the Italian National Institute of Health (ISS), the European Research Council and many others have implemented similar mandates, including all seven UK research councils. He believes that the new requirement is at least partly responsible for the increased use of PubMed Central; there were approximately 550,000 articles downloaded from the site in March 2008, and 680,000 last month.
The recession is driving down endowments and with them library budgets, leading independently to some degree of subscription cancellations.
Frank predicts that, as subscription revenues tank, publishers will be forced to levy stiff fees on authors for publishing. The number of articles downloaded from PubMed Central represent the average usage on a typical weekday, not a monthly total as we state. The articles become available through PubMed Central no more than a year after their journal publication. In February, Conyers re-introduced a bill from the last congressional session that would amend US copyright law to forbid the NIH making funding conditional on manuscripts being publicly accessible.

Disease groups such as the high-profile US foundation Autism Speaks have done the same, as have the Massachusetts Institute of Technology and the Faculty of Arts andSciences at Harvard University. He notes that the open-access journal group the Public Library of Science has boosted its publication fees for PLoS Medicine and PLoS Biology from US$1,500 in 2006 to $2,950 today; the author fees for four of its other five journals have risen to $2,300. They are pretty user-friendly," says Carol Mason, a neuroscientist at Columbia University in New York. Author compliance "has been dramatically altered" by converting an "anaemic" voluntary policy into law, says former NIH director Harold Varmus, now president of the Memorial Sloan Kettering Cancer Center in New York and a keen supporter of open-access initiatives. However, congressional observers say that the bill has little chance of going anywhere this year.
When she published a paper in the Journal of Neuroscience last month, the journal submitted the paper to PubMed Central for her.

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