Abstract
The orientation of pigments and pigment-protein complexes of the marine diatom Cylindrotheca fusiformis was studied by linear dichroism at 77 K. The technique of polyacrylamide gel squeezing was used to orient the diatom intact cells, their isolated thylakoid membranes and the three pigment-protein complexes: chlorophyll ac-fucoxanthin, chlorophyll ac and PS I complexes. The data indicate that specific orientation of various pigments exists at all structure levels. Tentative assignments of various features of the linear-dichroism spectra to the major photosynthetic pigments are presented. The orientation of the three pigment-protein complexes with respect to the thylakoid membrane plane and the major axis of the cell is also discussed.
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