Membrane ultrastructure of alkaliphilic Bacillus species studied by rapid-freeze electron microscopy.
AUTOR(ES)
Khan, S
RESUMO
Cells of Bacillus firmus OF4 and Bacillus alcalophilus were examined by rapid-freeze freeze-fracture and freeze-substitution electron microscopy. No special vesicular structures linked to growth at alkaline pH were found, either within or associated with the cytoplasmic membrane. The cytoplasmic membranes of the alkaliphilic bacilli and the neutrophilic Bacillus subtilis BD99 were indistinguishable. Distinctive intramembrane particle rings, presumed to be flagellar structures on the basis of distribution and morphological characteristics, were found in all of these species. These observations indicate that the adaptations required to effect oxidative phosphorylation and flagellar rotation at extreme alkaline pH occur without gross morphological rearrangement.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=206330Documentos Relacionados
- New structural features of the flagellar base in Salmonella typhimurium revealed by rapid-freeze electron microscopy.
- Analysis of outer membrane ultrastructure of pathogenic Treponema and Borrelia species by freeze-fracture electron microscopy.
- Analysis of Borrelia burgdorferi membrane architecture by freeze-fracture electron microscopy.
- Ultrastructure of chicken cardiac muscle as studied by double immunolabeling in electron microscopy.
- Morphological forms and viability of Campylobacter species studied by electron microscopy.