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- Publisher
- Springer Journals
- Copyright
- Copyright © 1967 by Springer-Verlag
- Subject
- Life Sciences; Biotechnology; Biochemistry, general; Cell Biology; Ecology; Microbial Ecology; Microbiology
- ISSN
- 0302-8933
- eISSN
- 1432-072X
- DOI
- 10.1007/BF00408695
- Publisher site
- See Article on Publisher Site
Abstract
203 57 57 2 2 Roger V. Smith A. Peat Department of Botany University of Durham England Summary An investigation was made of 5 species of blue-green algae reported to contain gas-vacuoles. All organisms were grown and harvested under standard conditions. Gas-vacuoles were characterised as reddish structures which are destroyed by applying pressure. Using a simple direct preparation technique gascylinders were observed with the transmission electron microscope in gas-vacuolate cells. Gas-vacuoles were present in the strains of Anabaena flos-aquae, Gloeotrichia echinulata and Oscillatoria agardhii studied and absent from Microcystis aeruginosa and Nostoc linckia . The reddish, refractile central area of N. linckia and M. aeruginosa cells was tentatively identified as nucleoplasm. Gas-vacuoles are collections of gas-cylinders 70 mμ wide, which in A. flos-aquae and G. echinulata are clearly bounded by photosynthetic lamellae and associated with α-granules. The presence of bounding photosynthetic lamellae in these species is suggested as a causal factor of the unusual optical properties of their gas-vacuoles. The range of lengths of gas-cylinders in G. echinulata and O. agardhii is from 100 mμ to 500 mμ and in A. flos-aquae it is from 100 mμ to 1300 mμ. The percentage of cell volume occupied by gas-vacuoles was estimated by direct measurement. In A. flos-aquae and G. echinulata it was 22%. In O. agardhii gas-cylinders were not clearly associated with photosynthetic lamellae and α-granules and occupied 39% of cell volume. Gascylinder membranes showed reasonable preservation in KMnO 4 and excellent preservation in OsO 4 . The widths of membranes after treatment with these two fixatives was 3 mμ and 2 mμ respectively.
Journal
Archives of Microbiology – Springer Journals
Published: Jun 1, 1967