Enumerations for _Sample.Type (An open enumeration)
`bicelle` | enumeration_text
`emulsion` | enumeration_text
`fiber` | 'solid-state fiber sample'
`fibrous protein` | enumeration_text
`filamentous virus` | enumeration_text
`gel solid` | 'gel samples used for solid-state NMR'
`gel solution` | 'gel samples used for solution NMR'
`liposome` | enumeration_text
`lyophilized powder` | enumeration_text
`membrane` | enumeration_text
`micelle` | enumeration_text
`oriented membrane film` | enumeration_text
`polycrystalline powder` | enumeration_text
`reverse micelle` | enumeration_text
`single crystal` | enumeration_text
`solid` | enumeration_text
`solution` | enumeration_text