Entering a Search Query
In the query box, enter one or more terms that describe your search topic. These may be any combination of words, chemical names, and numbers, including Chemical Abstracts Services Registry Numbers (CASRNs). Examples of search terms:
- vinyl chloride
- dna adducts
- skin tumors
- aflatoxin b1
The term(s) entered will be searched for in all ALTBIB fields.
You can view the full search strategy, including any mapped terms, by examining the list items under "Modify PubMed Search Strategy" on the Edit ALTBIB Search page. Clicking the check box beside a list items will reveal the structure of that search subtopic, which you can modify by editing the terms in the text box.
The search, including any modifications you have made, will be initiated when you click the "Search" button. To erase your search term(s) and start over with a blank query box, click on the "Reset Form" link.
If your query includes chemicals, ALTBIB will expand your search by adding synonyms and CASRNs. For example, if you enter "perchloroethylene," the system will add the CASRN 127-18-4 and synonyms such as "tetrachloroethylene" and "tetrachloroethene." To turn off synonym searching, place double quotes around your query words, which will limit your search to the exacts term you enter.
Search terms entered in the query box will be matched against a translation table derived from the National Library of Medicine's Medical Subject Headings (MeSH) controlled vocabulary. This table includes MeSH terms, "see" cross references (i.e. entry terms), subheadings, and other equivalent or lexical variant terms identified in the Unified Medical Language System (UMLS). If your search term is found in the translation table, your search will be automatically augmented with terms associated with it. For example, if you enter "LLNA," ALTBIB will also search for the MeSH heading "Local Lymph Node Assay."