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PMC released a new and improved journal list on March 31, 2009, after a comprehensive redesign for greater clarity and organization.

The new design not only combines the full-list and tabbed-list views of the previous version but also includes some new or updated features to provide users with a greater overview of the total PMC archive. Looking at this new list, you will find:

1. An Expanded View of PMC journals that includes NIH Portfolio
2. Special Collections
3. A New “Participation Level” Journal Category
4. Hide/Show Display Option for Predecessor Titles
5. Article and Journal Search Feature

For more information, see the complete article in the May-June issue of the NLM Technical Bulletin: https://www.nlm.nih.gov/pubs/techbull/mj09/mj09_pmc_redesign.html

You can now find embargoed articles and their corresponding PMCIDs through a recently released search option in the PMC Entrez database. Using the “Limits” tab, click in the field, “Show both free and embargoed articles” and refine your search by journal, author, date, article type, and/or tag term, as needed. Once you’re on the summary page, click on the “embargoed” tab at the top to find the articles in this category. You can then find the PMCID and date of availability at the bottom of the article citation, as indicated in the example below. Note: The PMC search option only includes articles with an initial embargo of up to 12 months. Articles with an embargo greater than 12 months are not compliant with the NIH Public Access Policy and will appear in search results only when the full text is free in PMC. For more information, see the article in the September-October issue of the NLM Technical Bulletin.

PMC marked its 10th anniversary in 2010 with a celebratory event at its annual Advisory Committee meeting, held at the National Library of Medicine last June. This milestone event was recently featured in the February 17th edition of NLM In Focus, in an article NLM Milestones: The Hits Just Keep on Coming. For more information on the ten years of PMC, see the article in the May-June issue of the NLM Technical Bulletin.

The PMC user's guide, PMC Help has been updated to include new and improved information on navigating the site as well as descriptions and instructions on using the new search functions, such as Limits and Advanced Search Builder. Further updates will also be forthcoming.

NCBI has developed a new web presentation style called PubReader, which offers you an easier way to use your Web browser to read the articles in PMC. Designed particularly for enhancing readability and navigation on tablet and other small screen devices, PubReader can also be used on desktops and laptops and from multiple web browsers. For more information on PubReader, see the article in the November-December issue of the NLM Technical Bulletin.

KoreaMed Synapse, a digital archive and reference linking platform of Korean medical journals, is now using NCBI’s new PubReader presentation style to display their full-text journal articles. KoreaMed’s database of 122 journals now includes a blue ‘PubReader’ icon for each full-text article. NCBI launched PubReader in December 2012 as a convenient new way to view full-text articles in PubMed Central on desktops as well as tablets and mobile devices. In tandem with the launch, NCBI made the code used to create PubReader freely available on GitHub.

PMC has created a new email list for announcements of new or updated tools and utilities to help you keep better track of improvements to the archive. To find out more information about the list, or to subscribe, please visit PMC-Utils-Announce.

You can now search for Open Access articles that have certain types of licenses, by using special filters in both PMC and PubMed. These filters are based on license information that is provided to PMC by publishers and other content providers, as encoded by machine-readable identifiers in the source XML of each article. For more information, see our updated Open Access Subset page.

PMC has recently released an updated version of its PubReader view. The new version (1.2) includes a "search this page" feature that allows you to find specific terms within the article. The latest source code is also available from the GitHub repository.

PMC has just released an upgrade to our ID converter, now dubbed the PMCID - PMID -Manuscript ID - DOI Converter. This utility allows you to start with the unique identifier for an article that is in PMC, and find additional unique identifiers that may apply to the article. Improvements include support for DOIs, auto-detection of the ID type based on its format, and enhanced output. It also provides output in any of several different formats: HTML, XML, JSON, or CSV. This tool uses an underlying web service, that is also publicly available for those needing programmatic access to this data. See the ID Converter API documentation.

PMC is happy to announce the addition of a citation exporter feature. This feature makes it easy to retrieve either styled citations that you can copy/paste into your manuscripts, or to download them into a format compatible with your bibliographic reference manager software.

When viewing an Entrez search results page, each result summary will now include a "Citation" link. When, clicked, this will open a pop-up window that you can use to easily copy/paste citations formatted in one of three popular styles: AMA (American Medical Association), MLA (Modern Language Association), or APA (American Psychological Association). In addition, the box has links at the bottom that can be used to download the citation information in one of three machine-readable formats, which most bibliographic reference management software can import.

The same citation box can also be invoked from an individual article, either in classic view (with the "Citation" link among the list of formats) or the PubReader view, by clicking on the citation information just below the article title in the banner.

These human-readable styled citations, and machine-readable formats, will be available through a public API, and we will be providing more details about that in another announcement, on the pmc-utils-announce mailing list. Please subscribe to that list if you are interested.

As of August 2016, PMC is home to four million articles! To make this wealth of full-text content easier to navigate, PMC has rolled out a few updates:

1) Search Result Filters
On all search results pages, you will now see filters (similar to PubMed’s filters) on the left-hand side that allow you to filter your results by article attributes, publication date, research funder, and search fields. These filters replace the Limits page and allow you to more readily:

• find open access articles (PMC has more than 1.35 million open access articles that can be reused according to their license statements),
• explore PMC’s rich historical content from NLM's back issue digitization project,
• browse research supported by PMC-participating funding organizations (click "Customize" to view additional funder options),
• and much more.

You can now also quickly add articles that are under a 12-month or less embargo in PMC to your search results by selecting the “Include embargoed articles” filter option under Text Availability. See the PMC User Guide for more information on these filters.

2) Reference List Display
Using related article data available in PMC, articles that cite papers that have been either retracted or named in a Findings of Research Misconduct issued by the HHS Office of Research Integrity and not yet retracted will now include a red hyperlink to the relevant notice directly from the article’s reference list. This update will help users more easily identify post-publication updates to existing research.

Since March 2016, the NIH Manuscript Submission (NIHMS) system has added support for researchers from the following federal agencies to deposit in PMC any manuscripts that fall under the agency’s public access policy:

• Assistant Secretary for Preparedness and Response (ASPR/HHS; intramural only at this time)
• Environmental Protection Agency (EPA; intramural only at this time)
• National Aeronautics and Space Administration (NASA; intramural/civil servants and grantees)

Manuscript deposit support for all Administration for Community Living (ACL/HHS) researchers will be available in NIHMS by October 2017 and for Department of Homeland Security researchers in early 2018.

Additionally, the Bill & Melinda Gates Foundation Open Access Policy now requires their grantees to make their published research results available in PMC immediately upon publication under a Creative Commons Attribution (CC-BY) license. Manuscript deposit support is not provided in NIHMS for Gates-funded researchers; rather the final published version of any Gates-funded article is to be deposited directly to PMC by the publisher or a funder-supported data provider without author involvement. More information on this open access policy is available on the Gates Foundation website.

PMC will continue to update the list of participating funding agencies at Public Access and PMC as support is implemented.

As we kick off a new year, we wanted to take this opportunity to look back on 2017, which was a milestone year for PMC.

Last year, PMC made nearly half a million articles available for the public to access with the support of participating journals, publisher programs, and research funders. Also, in addition to expanding support for public access to research results and the linking of those results to the underlying dataset(s), PMC released several other policy and resource updates. These include:

1. Clearer statement of scope for PMC (see also the updated entry in the NLM Collection Development Manual for “Journals”);
2. Guidance for journals on reapplying to PMC;
3. Policy statements on the scientific, editorial, and technical standards for PMC (including details on the journal reevaluation process), the supply of back content, the eligibility of non-English language journals, and the maintenance of publishing schedules;
4. Production data requirements for PMC-participating journals; and
5. Major update to the PMC Article Previewer, a tool that allows publishers to see or “preview” how articles will appear in PMC and resolve data problems prior to submission.

In September, NLM recognized the achievements to date in the Wellcome Trust and NLM Biomedical Journal Digitization project, which has added a dozen new historical titles and more than a half million pages to the PMC archive. The PMC archive now includes content from as far back as the late 18th century.

Many thanks all our participants and users for a wonderful year!

PMC has released expanded information about its selection process for journals that apply for participation. The current review process has been in place since November 2014 and focuses on the scientific rigor and editorial quality of each journal that applies to participate in PMC. Some of the attributes taken into account as part of this process include the article content, journal policies, language quality, and presentation of content. The same assessment considerations are used for reevaluation of currently participating journals. We encourage you to visit the Journal Selection for PMC page to learn more.

Publishers and journals interested in submitting an application to PMC are also encouraged to review our updated policies on agreement types. These policies provide the eligibility criteria for each type of participation agreement and should be considered alongside the pre-application requirements.

We hope these updates are informative and look forward to hearing your feedback.

Machine-readability of scholarly outputs is critical to supporting large-scale analysis of the scientific literature. To that end, PMC’s Tagging Guidelines and internal processes have been updated to support the JATS4R recommendations for tagging clinical trial information. NLM encourages PMC-participating publishers, journals, and data providers to review this guidance. Please contact us at pubmedcentral@ncbi.nlm.nih.gov if you have any questions.

On March 18, 2019, PMC will no longer provide bulk packages of Open Access (OA) Subset text and XML at the top level directory of the FTP Service. These files were superseded in August 2016 by the Commercial Use and Non-Commercial Use bulk packages located in the oa_bulk subdirectory. One set comprises articles that may be used for commercial purposes (the Commercial Use Collection); the other contains articles that can be used only for non-commercial purposes. Anyone planning to use OA subset content for non-commercial purposes will need to download both “non_comm_use.*.tar.gz” and “comm_use.*.tar.gz” to access the complete collection. See the Open Access Subset page for additional details. Questions should be directed to pubmedcentral@ncbi.nlm.nih.gov.

On March 13, 2020, the National Science and Technology Advisors from a dozen countries, including the United States, called on publishers to voluntarily agree to make their COVID-19 and coronavirus-related publications and associated data immediately accessible in PubMed Central (PMC) and other appropriate public repositories to support the ongoing public health emergency response efforts.

For more information on which publishers have responded to this call and how to discover COVID-19 and coronavirus-related publications in PMC, see the main COVID-19 Initiative page.

A FAQ is also available. If you have questions not addressed in the FAQ, please contact pmc-phe@ncbi.nlm.nih.gov.

You can learn more about how this initiative fits into the wider NLM response to the current public health emergency in Dr. Patti Brennan's post, "How Does a Library Respond to a Global Crisis?"

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Category: Health News
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