Data Item _chem_shift_ref.chem_shift_units
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General 
- Item name
- _chem_shift_ref.chem_shift_units
- Category name
- chem_shift_ref
- Attribute name
- chem_shift_units
- Required in PDB entries
- yes
- Used in currrent PDB entries
- No
Item Description
Units for the chemical shift value assigned to the atoms of the chemical
shift reference.
Item Example
ppm
Data Type 
- Data type code
- line
- Data type detail
- char item types / multi-word items ...
- Primitive data type code
- char
- Regular expression
- [][ \t_(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*
Controlled Vocabulary
| Allowed Value | Details |
|---|---|
| Hz | Hertz |
| MHz | megahertz |
| na | not available |
| ppm | parts per million |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| Hz | Hertz |
| MHz | megahertz |
| na | not available |
| ppm | parts per million |