Ribosomes and their subunits have been isolated from Halobacterium marismortui, an extremely halophilic bacterium from the Dead Sea. The stability and functional activity of the subunits were tested under a wide range of salt conditions. Three‐dimensional microcrystals of the large ribosomal subunits have been obtained. Electron microscopy of positively stained thin sections of these crystals showed that the particles are closely packed with approximate cell constants of 310 × 350 Å.

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