Quertle: Relationship-Driven Biomedical Search

Why Quertle is Different

It's easy - Quertle's friendly interface makes it simple to search and refine results.
It's powerful - Using its advanced semantics, Quertle finds quality search results, not just long lists.
It's inclusive - All of PubMed (MEDLINE) plus an ever increasing number of full-text documents.
NEW: More Content - News (so you can find information before publication in the literature) and whitepapers (corporate
   research reports and scientific posters).

Find Relationships, not Just Keywords

If you search for two or more terms, you will find occurrences of a conceptual relationship, not just the terms scattered within the same document.

Focus on Core Concepts

Since Quertle searches for Relationships, all the terms in your query must be found together in a meaningful way. Thus, Quertle immediately gives you results with more relevance.

Unleash the Strength of Power Terms™

Use Power Terms to search for categories of objects. For instance, you can use "$Protein" to search for any protein, rather than the occurrence of the term, "protein". View all Power Terms.

Search Full-text Documents

The Quertle search engine has been optimized to search full-text documents, including the Material and Methods section (but not the Bibliography).

Use Real Biology & Chemistry Terms

Quertle recognizes capital "TWIST" as the transcription factor (not the verb), and capital "NO" as "nitrous oxide"(not a negative). So, use proper capitalization in your query, and you won't be lost in a sea of irrelevant results.

Look for the Quertle Difference on the Results Page

» More relevant results

» Easy filtering and breadcrumb tracking

» Automatic identification of key concepts

» Single-click access to PDFs of full-text documents

Quertle is a registered trademark of Quertle, LLC. PubMed & MEDLINE are registered trademarks of the National Library of Medicine.

Relationships vs. Keywords

Relationships are conceptual facts based on the context and implication of the text. A document may have more than one relationship relevant to your search. Click on "Expand All Relationships" to view more relationships.

Keyword Results, in contrast, are independent of context and simply have your search terms anywhere within the document.

Results Order

Results are initially ordered by relevance to your search. You can also sort by publication date. Note that documents with a date of "Epub" (an electronic publication ahead of print). will be sorted based on their expected publication date.

Easy to Use Filters

Several types of filters, such as Published Within (date) and Publication Type are found in the Filters section, making it easy to focus in on what is most important.

Key Concepts

In the Filters section, use the automatically extracted Key Concepts to refine the Relationship results. General Concepts, as well as action words can also be used for filtering. Click on the desired term to limit the relationships shown to those containing the selected concept.

Highlighting

Terms (and their synonyms) used in your query will be highlighted. You have the option to turn highlighting off.

Power Terms™

Use any of the following Power Terms in your query to represent an entire class of related concepts. Click on a term to add it to the current query (or type them directly). Power Terms can be combined in a single query. The most common Power Terms are shown below; for more, see the full list of Power Terms.

Full List of Power Terms

Examples

Sample queries for several fields are shown. Click the desired query to execute any of the samples. Note that queries are focused on Relationships, leaving modifier terms to be applied as filters.