Crystal habits and magnetic microstructures of magnetosomes in coccoid magnetotactic bacteria
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| Natura: | Artículo científico |
| Lingua: | en |
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Academia Brasileira de Ciências
2006
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| _version_ | 1876463862798090240 |
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| author | Ulysses Lins |
| author_facet | Ulysses Lins |
| contents | Crystal habits and magnetic microstructures of magnetosomes in coccoid magnetotactic bacteria Ulysses Lins Martha R. McCartney Marcos Farina Richard B. Frankel Peter R. Buseck Multidisciplinaria (Ciencias Naturales y Exactas) high magnetite magnetotaxis resolution transmission electron microscopy We report on the application of off-axis electron holography and high-resolution TEM to study the crystalhabits of magnetosomes and magnetic microstructure in two coccoid morphotypes of magnetotactic bacteriacollected from a brackish lagoon at Itaipu, Brazil. Itaipu-1, the larger coccoid organism, contains twoseparated chains of unusually large magnetosomes; the magnetosome crystals have roughly square projections,lengths up to 250 nm and are slightly elongated along [111] (width/length ratio of about 0.9). Itaipu-3magnetosome crystals have lengths up to 120 nm, greater elongation along [111] (width/length ∼0.6), andprominent corner facets. The results show that Itaipu-1 and Itaipu-3 magnetosome crystal habits are related,differing only in the relative sizes of their crystal facets. In both cases, the crystals are aligned with their[111] elongation axes parallel to the chain direction. In Itaipu-1, but not Itaipu-3, crystallographic positioningperpendicular to [111] of successive crystals in the magnetosome chain appears to be under biological control.Whereas the large magnetosomes in Itaipu-1 are metastable, single-magnetic domains, magnetosomesin Itaipu-3 are permanent, single-magnetic domains, as in most magnetotactic bacteria. 2006 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32778307 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.3 Vol.78 |
| format | Artículo científico |
| id | redalyc_32778307 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | Crystal habits and magnetic microstructures of magnetosomes in coccoid magnetotactic bacteria Ulysses Lins Multidisciplinaria (Ciencias Naturales y Exactas) high magnetite magnetotaxis resolution transmission electron microscopy Crystal habits and magnetic microstructures of magnetosomes in coccoid magnetotactic bacteria Ulysses Lins Martha R. McCartney Marcos Farina Richard B. Frankel Peter R. Buseck Multidisciplinaria (Ciencias Naturales y Exactas) high magnetite magnetotaxis resolution transmission electron microscopy We report on the application of off-axis electron holography and high-resolution TEM to study the crystalhabits of magnetosomes and magnetic microstructure in two coccoid morphotypes of magnetotactic bacteriacollected from a brackish lagoon at Itaipu, Brazil. Itaipu-1, the larger coccoid organism, contains twoseparated chains of unusually large magnetosomes; the magnetosome crystals have roughly square projections,lengths up to 250 nm and are slightly elongated along [111] (width/length ratio of about 0.9). Itaipu-3magnetosome crystals have lengths up to 120 nm, greater elongation along [111] (width/length ∼0.6), andprominent corner facets. The results show that Itaipu-1 and Itaipu-3 magnetosome crystal habits are related,differing only in the relative sizes of their crystal facets. In both cases, the crystals are aligned with their[111] elongation axes parallel to the chain direction. In Itaipu-1, but not Itaipu-3, crystallographic positioningperpendicular to [111] of successive crystals in the magnetosome chain appears to be under biological control.Whereas the large magnetosomes in Itaipu-1 are metastable, single-magnetic domains, magnetosomesin Itaipu-3 are permanent, single-magnetic domains, as in most magnetotactic bacteria. 2006 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32778307 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.3 Vol.78 |
| title | Crystal habits and magnetic microstructures of magnetosomes in coccoid magnetotactic bacteria |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) high magnetite magnetotaxis resolution transmission electron microscopy |
| url | https://www.redalyc.org/articulo.oa?id=32778307 |