Produção Nacional
Revisado por pares
Membrane vesicles in magnetotactic bacteria
2003; Elsevier BV; Volume: 158; Issue: 4 Linguagem: Inglês
10.1078/0944-5013-00210
ISSN1618-0623
AutoresUlysses Lins, Marcos Farina, Bechara Kachar,
Tópico(s)Planetary Science and Exploration
ResumoMagnetotactic bacteria are microorganisms that respond to magnetic fields. We have studied the surface ultrastructure of Magnetospirillum magnetotacticum and uncultured magnetotactic bacteria from a marine environment using transmission electron microscopy and freeze-etching. Numerous membrane vesicles were observed on the surface of Magnetospirillum magnetotacticum bacteria. All uncultured magnetotactic bacteria presented membrane vesicles on their surface in addition to an extensive capsular material and an S-layer formed by particles arranged in a hexagonal symmetry. We did not observe any indication of electron-dense precipitation on the surface of these microorganisms. Our results indicate that membrane vesicles are a common characteristic of magneto-tactic bacteria in natural sediments.
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