Abstract
SummaryThe thylakoids of the filamentous non-heterocystous cyanophycea Oscillatoria brevis Kutz, studied on freeze fractures show important structural changes when cells are submitted to nitrogen privation. The EF particles regularly arranged in parallel alignments in normal cells (N), have a disordered arrangement in nitrogen-deprived cells (C).The number of particles per μ2 slightly increases (as a possible result of thylakoidal surface decrease) and the mean size of EF particles decreases in a significant way in cells (C). This is probably the result of the disappearance of chlorophyll-protein complexes associated with photosystem II, which are part of EF particles.
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