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<div class="actions">April 26, 2007 <span class="status">[posted]</span>
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<h1>PubMed Central<span class="registered">&#174;</span> Limits Page Improved</h1>
<img src="../new_tb_graphics/t.gif" class="initcap" alt=""
width="35" height="43" />
<p class="first">
<span class="initcap">t</span>
he <a href="//www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PMC&amp;itool=toolbar">PubMed Central</a> (PMC) Limits page now offers improved searching by author, journal, and date as well as by article types or within specified fields (Tag Terms) (see <a href="#fig1">Figure 1</a>).
</p>
<br />
<div class="figure" style="width: 502px;">
<a name="fig1" id="fig1">
<img src="graphics/pmc_limits_fig1.gif"
alt="The new Limits page."
title="" width="500" height="403" /><br />
<strong>Figure 1: The new PubMed Central Limits page.</strong>
</a>
</div>
<h2>Limiting Searches by Author or Journal</h2>
<p>
To search by author, click <strong>Add Author</strong>. The author search box, which includes an autocomplete feature, will be displayed. Enter a name in the Author name box to see a list of suggested names (see <a href="#fig2">Figure 2</a>); this list shortens as you type more letters. Select the author name you are looking for when it appears.
</p>
<br />
<div class="figure" style="width: 502px;">
<a name="fig2" id="fig2">
<img src="graphics/pmc_limits_fig2.gif"
alt="Add Author on the Limits page."
title="" width="500" height="148" /><br />
<strong>Figure 2: Add author on the Limits page.</strong>
</a>
</div>
<p>
To add more authors, click <strong>Add Another Author</strong>. By default, if you add multiple authors, all the names selected are included in your search -- the <strong>All these authors</strong> option (see <a href="#fig3">Figure 3</a>) using the Boolean operator <strong>AND</strong>. To search for any authors, click the <strong>Any of these</strong> radio button which uses the Boolean operator <strong>OR</strong>. To delete an author search box, click the <strong>remove</strong> link. Author names will automatically move to the PMC search box when you click <strong>Go</strong>.
</p>
<br />
<div class="figure" style="width: 502px;">
<a name="fig3" id="fig3">
<img src="graphics/pmc_limits_fig3.gif"
alt="Author radio button on the Limits page."
title="" width="500" height="122" /><br />
<strong>Figure 3: Author searching options on the Limits page.</strong>
</a>
</div>
<p>
To search by journal, click <strong>Add Journal</strong>. A journal search box, which includes an autocomplete feature, will be displayed. Enter a name in the journal name box to get a list of suggested names. This list includes journals that participate in PMC (including earlier names for a journal, if applicable) as well as author manuscripts from other journals provided through the NIH Manuscript Submission System. Select the journal title you are looking for when it appears.
</p>
<p>
To add more journals, click the <strong>Add Another Journal</strong> link. When multiple journals are selected, search results include any of the selected journals. Journal titles will automatically move to the PMC search box when you click <strong>Go</strong>.
</p>
<h2>Limiting Searches by Dates</h2>
<p>
You may limit your search to articles published or added to PMC by a pre-set date range (see <a href="#fig4">Figure 4</a>) or you may enter any desired date range (see <a href="#fig5">Figure 5</a>). Date limits remain in effect for subsequent searches unless you change them or turn them off (see <a href="#fig8">Turning Limits on or off</a>).
</p>
<br />
<div class="figure" style="width: 502px;">
<a name="fig4" id="fig4">
<img src="graphics/pmc_limits_fig4.gif"
alt="Dates pull-down menu."
title="" width="500" height="187" /><br />
<strong>Figure 4: Dates pull-down menu.</strong>
</a>
</div>
<br />
<div class="figure" style="width: 502px;">
<a name="fig5" id="fig5">
<img src="graphics/pmc_limits_fig5.gif"
alt="User-specified published date range."
title="" width="500" height="124" /><br />
<strong>Figure 5: User-specified published date range.</strong>
</a>
</div>
<h2>Limiting Searches by Article Types</h2>
<p>
To limit your search by article type, click the checkbox next to each desired type (see <a href="#fig6">Figure 6</a>). It is important to note that the Article Types limits are not based on MeSH<span class="registered">&#174;</span> publication type terms, but are drawn from information provided by publishers.
</p>
<p>
By default, if you select multiple article types, any of the article types selected are included in your search (<strong>Any of these article types</strong>). To search for all article types instead of any article types, click the <strong>All of these article types</strong> radio button, or click <strong>None of these article types</strong> to exclude certain article types from your search.
</p>
<p>
Article Types limits remain in effect for subsequent searches unless you change them or turn them off (see <a href="#fig8">Turning Limits on or off</a>).
</p>
<br />
<div class="figure" style="width: 502px;">
<a name="fig6" id="fig6">
<img src="graphics/pmc_limits_fig6.gif"
alt="Article types on the Limits page."
title="" width="500" height="137" /><br />
<strong>Figure 6: Article types on the Limits page.</strong>
</a>
</div>
<h2>Tag Terms</h2>
<p>
To limit search terms to a specific citation field or by Text Word, choose a field from the Tag Terms menu located at the bottom of the PMC Limits page.
</p>
<h2><a name="fig8" id="fig8">Turning Limits on or off</a></h2>
<p>
When limits are active, a check appears in the Limits tab and your selected limits are indicated in a yellow bar (see <a href="#fig7">Figure 7</a>). To turn off limits, click off the Limits tab checkbox and run a new search. Author and journal selections will only be included in subsequent searches if they are not cleared from the PMC search box.
</p>
<br />
<div class="figure" style="width: 502px;">
<a name="fig7" id="fig7">
<img src="graphics/pmc_limits_fig7.gif"
alt="Search results with Limits set to Open Access Articles type."
title="" width="500" height="233" /><br />
<strong>Figure 7: Search results with Limits set to Open Access Articles type.</strong>
</a>
</div>
<p class="authors">
By
Mark Desierto<br />
National Center for Biotechnology Information<br />
</p>
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<!--************************CHANGE CITATION INFORMATION BELOW*****************************-->
<p class="citation">Desierto M. PubMed Central<span class="registered">&#174;</span> Limits Page Improved. NLM Tech Bull. 2007 Mar-Apr; (355):e14. </p>
<!--************************END CITATION INFORMATION**************************************-->
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