Electron microscopy of poly (O-acetyl hydroxy-L-proline) crystals

✍ Scribed by J. C. Andries; A. G. Walton

• Publisher: Wiley (John Wiley & Sons)
• Year: 1969
• Tongue: English
• Weight: 722 KB
• Volume: 8
• Category: Article
• ISSN: 0006-3525
• DOI: 10.1002/bip.1969.360080404

✦ Synopsis

Single crystals of POAHP I1 were grown from acetic anhydride, a solvent in which POAHP I is thought to be stable. The single crystals gave an electron diffraction pattern whichospecified a hexagonal unit cell and the lateral spacing between molecular chains (11.4 A). There is reasonable indication that molecular chain folding occurs in the POAHP single crystals. Epitaxial crystallization of POAHP I1 has been observed in the [loo] and [320] directions on NaC1, [I101 direction on KC1, and [loo] direction on KI. Evidence indicates that the molecular axis is normal to the long axis of the POAHP needles and parallel to the substrate surface.