STN International - The Scientific and Technical Information Network
Search Example: Toxicology
Question: What are the TLV's (Threshold Limit Values) for beryllium?
Strategy: An easy way to answer this question is to locate substance information in the "Toxicology" category, especially in the RTECS database.
Search Strategy
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Log on to STN Easy at STN Easy Home Page
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To open a new STN Easy account, click the blue "Open New Account" button on the STN Easy Home Page and complete and submit the online forms. Within 30 minutes, your STN login ID and password will be sent to the e-mail address you specify.
If you have an existing STN account:
To log on to STN Easy, simply enter your login ID and password.
Then click "Start Your Session."
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   Select Search Mode:
STN Easy Search Page
The Search Page is displayed. It offers three different search options: "Easy", "Advanced" and "CAS Number" Search.
To find toxicological information, select the "Advanced Search" tab.
The Advanced Search option prompts you to choose the category of databases you wish to search. Click the "Select Your Category" button for the list of categories.
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   Select Databases:
Select database category
An additional browser window is opened. It displays the list of STN Easy database categories.
Select the category "Toxicology" and click the yellow Database Folder icon to see the list of databases included in this category.
De-select all but the RTECS (Registry of Toxic Effects of Chemical Substances) database and click "OK".
The window closes and you are ready to enter the search terms.
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   Enter Search Terms:
Enter search terms
Pick "Chemical Name" from the first drop-down box and type in the name of the substance.
Click the green "Search" button. - Note that the search costs are displayed below the Search button.
More info about Search Guidelines
Helpful HINT: Use the free "Browse Index" button before clicking "Search" to make sure that the chemical name you entered is spelled correctly and is included in the database you have chosen - before you actually pay for the search.
Simply select the chemical name you wish to search from the "Browse Index" list, then click "Search".
More info about Browse Index feature
   Answer page:
Select title at Answer Page
The list of answers is displayed in a table format on the Answer Page.
The RTECS record for beryllium is located. To view the detailed record, click the blue "Display Answers" button or directly the title hyperlink. - You may change the Display Format and Display Style using the selection boxes at the bottom of the title list.
Please note: The display cost is shown to the right of the answer.
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Helpful HINT: With more complex chemical names, it is often better to start your search in the CAS Number search, get the CAS Registry answer and then cross over to RTECS with the toxicology link at the end of the record. By starting with the CAS Registry record, all the listed synonyms for the chemical name are searched automatically in the toxicology category.
More info about CAS Number Search
   Display page:
See detailed record at Display Page
Immediately, the detailed record of RTECS database is displayed - including the relevant Threshold Limit Values.
More info about STN Easy Display Page
Helpful HINT: At any time during your STN Easy search, you can determine the cost of your search activity to date by clicking "Session Cost" link on the navigation frame.
In order to start a new search, simply click the appropriate search option below the STN Easy Logo on the blue Navigation Frame and a new Search Page is displayed.
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