Advanced Search Examples

Search for records by using field tags, set combinations or a combination of both. Search operators and wildcards are allowed.


AU=(Olson M* AND McAllister T*)

Finds records co-authored by Olson, M and McAllister, T.


AI=(A-1009-2008 OR 0000-0002-1553-596X)

Finds records in which either the Researcher ID A-1009-2008 or the ORCID identifier 0000-0002-1553-596X appears in the Author Identifiers table


AU=Chen J* NOT AD=China

Finds records in which Chen J (including Chen, Jiaji; Chen, Jun-Yuan; Chen, Jian; Chen, Jian-Xiu; and so on) is an author, but excludes records in which China appears in the Address field.


CH=(Hemoglobin AND Glucose)

Finds records in which the chemical names hemoglobin and glucose appear in the Chemical Data table.


CPD=Mir Project AND MT=Weightlessness

Finds records of articles that contain Mir Project in the Space Flight Mission field and the subject heading weightlessness as a major topic.



Find the record that contains AI48470 in the Grant Information field.



Finds records of documents authored by the Centers for Disease Control (CDC).



Finds records of publications such as journals and electronic publications that contains this ISSN number in the ISSN field within a record.

The ISSN (International Standard Serial Number) searches for periodical publications such as journals and electronic publications. If a journal has both a print ISSN and an electronic ISSN, then both display in the Full Record. The format is four numbers, a hyphen (-), three numbers, and then a check character that may be a number or X.


IS=0040-87* AND NL=04173*

Finds records whose ISSN begins with 0040-87 and whose NLM Unique ID begins with 04173.


MT:exp=Back Pain/etiology OR MT:exp=Neck Pain/etiology

Finds the MeSH term Back Pain or the MeSH term Neck Pain as a major topic with the qualifer etiology.


PY=2007 AND CH=(Hemoglobin AND Glucose)

Finds records published in 2007 containing the terms hemoglobin and glucose.

When searching by publication year, you must combine the PY= field tag with another field tag using the AND or NOT Boolean operator.

Example: TS=cell growth AND PY=2007

When entering a range of years, restrict your search to five years or less; otherwise, processing slows down and the product returns too many unproductive results.

Example: TS=cell growth AND PY=(2008-2010)


RN=(439-14-5 AND 7439-93-2)

Finds records that contain two CAS Registry Numbers: 439-14-5 and 7439-93-2.


RO=NASA AND TI=Robonaut*

Finds records that contain NASA in the Record Owner field and Robonaut (or Robonauts) in the Title field.


SO=Nature AND TS=Amphibian*

Finds records of articles that appear in the journal Nature that contain the term amphibian.

SO=Nature AND TS=Amphibian* AND PY=2001

Finds records of articles published in the journal Nature in 2001  that contain the term amphibian.


SO=Lancet* AND TI="Sleeping Sickness" AND PD=200*

Finds records of articles from any Lancet journal published between 2000 and the present whose title contains the phrase sleeping sickness.


SU=Computer Science

finds records in which this term appears in the Research Areas field of a Full Record. These records may also include other research areas such as:

  • Chemistry
  • Computer Science
  • Mathematics
  • Zoology

For a list of research areas, see Research Areas.


SU=Mathematical & Computational Biology OR SU=Mathematics

Finds records in which either or both research areas appear within the Research Area field in a Full Record. These records may also include other research areas such as:

  • Chemistry
  • Computer Science
  • Mathematics
  • Zoology
  • And more ...

See also Research Areas


TI=succinic acid

finds records in which the terms succinic and acid appear in the title.

TI="succinic acid"

finds records in which the exact phrase succinic acid appears in the title.


TS=Monte Carlo simulation

finds records of publications containing the terms Monte, Carlo and simulation in any Topic field. The terms do not have to appear together in the same field.

TS="Monte Carlo simulation"

finds records of articles containing the exact phrase Monte Carlo simulation in a Topic field.


TS=Tomato* AND IC=AY22*

Finds records containing tomato (or tomatoes) in any Topic field and a GENBANK accession number beginning with AY22 in the Molecular Sequence Data field.


TS=(Winter AND Sleep) AND #1 NOT #2

Finds all records containing the search terms sleep and winter that also contain the search terms found in set #1, but excludes all records that contain the search terms found in set #2.


Field Tags
  • AD=Address
  • AI=Author Identifiers
  • AU=Author
  • CH=Chemical
  • CPD=Collaborating Partner
  • GI=Grant Information
  • GP=Corporate Author
  • IC=Identifying Codes
  • MH=MeSH Heading*
  • MT=MeSH Major Topic*
  • NL=NLM Unique ID
  • PD=Publication Date
  • PMID=PubMed ID
  • PY=Year Published
  • RN=Registry Number
  • RO=Record Owner
  • SO=Publication Name
  • SU=Subject Area
  • TI=Title*
  • TS=Topic*

You can map or map/explode fields marked with an asterisk (*).


Search Query Rules
  • Each search term in the query must be explicitly tagged with a field tag. Different fields must be connected with search operators.

  • Extraneous spaces are ignored by the product. For example, extra spaces around opening and closing parentheses ( ) and equal (=) signs are ignored.

  • For set combinations, enter a number (#) sign before each set number in the query.

  • Only use SAME in Address searches. When used in other searches (such as Topic), SAME works exactly like AND.

  • The total number of search sets that you can create during a session is 200.


Search Tip

To search on the words AND, OR, NOT, and NEAR, enclose the word in quotation marks. Example: "Or"