Reliability of phases retrieved from 400-kV spot-scan images of purple membranes acquired on a slow-scan CCD camera

M. B. Sherman, W. Chiu

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Glucose-embedded purple membranes were used as a test specimen to evaluate the reliability of phases retrieved from 400-kV spot-scan images acquired on a 1024 x 1024 slow-scan CCD camera. This specimen was chosen because it represents a broad class of low-contrast radiation-sensitive biological objects and its structure is well established. The amplitudes of computed reflections from these images were strongly damped by the modulation transfer function of the camera. Nevertheless, their phases on average were< 12°different from the reference data of Henderson et al. (1986), Ultramicroscopy, 19, 147-178, up to 8.8 Å resolution, which corresponds to 0.8 of the Nyquist frequency of the camera.

Original languageEnglish (US)
Pages (from-to)285-289
Number of pages5
JournalJournal of Microscopy
Volume188
Issue number3
DOIs
StatePublished - Jan 1 1997
Externally publishedYes

Keywords

  • 400 kV electron cryomicroscopy
  • Modulation transfer function
  • Phase reliability
  • Slow-scan CCD camera
  • Spot-scan imaging

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology

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