| Skip navigation |
|
Medical terms can be difficult to remember, and often there are many names for a single concept (e.g., cancer of the colon, colonic neoplasm, colon cancer, etc.). Thus, Profiles in Science adds words related to those you entered automatically. This may increase the number of documents retrieved.
Example: When using the phrase heart attack in a search, the related phrase myocardial infarction will be added.
Date Comparison Operators:
| Operator | Date Meaning |
|---|---|
| < | Before |
| <= | Before or On (inclusive) |
| = | Only on this date |
| not = | NOT on this date |
| >= | After or On (inclusive) |
| > | After |
There are two keywords which can be used to specify indefinite quantities. Keywords must be all UPPERCASE letters.
| MIN | The earliest date available |
| MAX | The latest date available |
Date Field Examples:
| Date Field Values | Meaning |
|---|---|
| 1997-03-23 blank |
Any date from 1997-03-23 or later |
| March 23, 1997 blank |
Any date from March 23, 1997 or later |
| 1997-03-23 MAX |
same behavior |
| 1997-03-23 1997-03-23 |
Date field equals 1997-03-23 |
| blank 1997-03-23 |
Date is before 1997-03-23 inclusive |
| MIN 1997-03-23 |
same behavior |
| 1997-03-23 1999-01-01 |
Date is greater than or equal to 1997-03-23 but less than 1999-01-01 inclusive |
| Operator | Definition | Example |
|---|---|---|
| AND | Retrieved documents contain all words or phrases (and synonyms) connected by the AND operator | leukemia AND chemotherapy |
| OR | Retrieved documents contain either word or phrase (and synonyms) connected by the OR operator | aspirin OR ibuprofen |
| NOT | Retrieved documents do not contain the word or phrase (and synonyms) following the NOT operator | Immunodeficiency NOT AIDS |
| " " | Retrieved documents contain the exact words as specified between the quotes (and synonyms) | "heart attack" |
Notes on Operators
| Search Terms | Resultant Documents |
|---|---|
| cancer | cancer, cancers, tumors, and variations |
| heart attack | "heart attack", "myocardial infarction" |
| "heart attack" | the literal words "heart attack" must be found |
| crab OR lobster OR shrimp | any of the words crab, lobster, or shrimp |
| bank AND loan AND business | all of the words bank, loan, and business |
| bank, loan, business | all of the words bank, loan, and business. |
| bank NOT river | The word bank but not the word river |
| swim OR bike AND run | Stemmed variations of bike and run on the same page or stemmed variations of swim |
| (swim OR bike) AND run | Stemmed variations of swim or run and stemmed variations of bike |
| ((swim OR bike) AND run) OR walk | Stemmed variations of swim or run and stemmed variations of bike on the same page or stemmed variations of walk |