Data Item _pdbx_nmr_chem_shift_ref.external_ref

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General

Item name: _pdbx_nmr_chem_shift_ref.external_ref_loc
Category name: pdbx_nmr_chem_shift_ref
Attribute name: external_ref_loc
Required in PDB entries: no
Used in currrent PDB entries: No

Item Description

External chemical shift references are defined as either located within the sample (e.g., as a capillary) or external to the sample and are inserted into the spectrometer before, after, or both before and after the sample containing the molecular system studied in the entry.

Additional Descriptive Information for Depositors

 
External chemical shift references are defined as either located within
the sample (e.g., as a capillary) or external to the sample and are inserted into
the spectrometer before, after, or both before and after the sample containing
the molecular system studied in the entry.

Item Example

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 insert at center of experimental sample tube

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

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Allowed Value	Details
insert at center of a separate sample tube
insert at center of experimental sample tube
insert at outer edge of a separate sample tube
insert at outer edge of experimental sample tube
other
separate tube (no insert) not similar to the experimental sample tube
separate tube (no insert) similar to the experimental sample tube

Controlled Vocabulary at Deposition