Hidrológiai Közlöny 2007 (87. évfolyam)
6. szám - XLVIII. Hidrobiológus Napok: Európai elvárások és a hazai hidrobiológia Tihany, 2006. október 4–6.
92 HIDROLÓGIAI KÖZLÖNY 2007. 87. ÉVF. 6. SZ. 1. ábra. A különböző sejttípusokban található magnetit ntagnetoszómák. Az ábra egyes részeinek magyarázatát a 2. táblázat tartalmazza Köszönetnyilvánítás A kutatást az OTKA-T048607 számú pályázata támogatta. Irodalom Akai, J., Sato, T. and Okusa, S. (1991): TEM study on biogenic magnetite in deep-sea sediments from the Japan Sea and the Western Pacific Ocean. Journal of Electron Microscopy 40: 110-117. Arató, B„ Szányi, Z, Flies, C., Schüler, D„ Frankel, R. B., Buseck, P. R. and Pósfai, M. (2005): Crystal-size and shape distributions of magnetite from uncultured magnetotactic bacteria as a potential biomarker. American Mineralogist 90: 1233-1241. Baeuerlein, E. (Ed) (2000). Biomineralization, Wiley. Bazylinski, D. A. and Frankel, R. B. (2004): Magnetosome formation in prokaryotes. Nature Reviews Microbiology 2:217-230. Blakemore, R. P. (1975): Magnetotactic bacteria. Science 190: 377-379 Cox, B. L., Popa, R., Bazylinski, D. A., Lanoil, B., Douglas, S., Belz, A., Engler, D. L. and Nealson, K. H. (2002): Organization and elemental analysis of P-, S-, and Fe-rich inclusions in a population of freshwater magnetococci. Geomicrobiology Journal 19: 387-406. Flies, C. B., H. M. Jonkers, de Beer, D., Bosselmann, K., Böttcher, M. E. and Schüler, D. (2005): Diversity and vertical distribution of magnetotactic bacteria along chemical gradients in freshwater microcosms. FEMSMicrobiology Ecology 52: 185-195. Grunberg, K„ Muller, E. C„ Otto, A., Reszka, R., Under, D„ Kube, M, Reinhardt, R. and Schuler, D. (2004): Biochemical and proteomic analysis of the magnetosome membrane in Magnetospirillum gryphiswaldense. Applied and Environmental Microbiology 70: 10401050. Lins, U. and Farina, M. (1999): Phosphorus-rich granules in uncultured magnetotactic bacteria. Ferns Microbiology Letters 172: 23-28. Pósfai, M. and Arató, B. (2000): Magnetotactic bacteria and their mineral inclusions from Hungarian freshwater sediments. Acta Geologica Hungarica 43: 463-476. V ÍÁ 2. ábra. P- és Ca-tartalmú zárványokat tartalmazó kokkusz sejt és a megjelölt zárvány EDS spektruma Magnetotactic bacteria from Lake Balaton Kósa, I. — Pósfai, M. Abstract: The abundance and morphotype distribution of magnetotactic bacteria in Lake Balaton were studied from the spring of 2004 to the autumn of 2005, by observing magnetically enriched drops with a light microscope. In order to study the pysical and chemical properties of magnetosomes and their locations within cells, whole mounts were examined using transmission electron microscopy (TEM). Elemental compositions of the magnetosomes and other inclusions within the cells were determined using energy-dispersive X-ray spectrometry. We found that the distribution of the different morphotypes of magnetotactic bacteria varied seasonally. Based on the spatial arrangements of magnetosomes, six types of magnetotactic bacteria occurred in the samples. All of the inclusions besides magnetite were amorphous, and their compositions, sizes and numbers varied in the different morphological types. Keywords: magnetotactic bacteria, magnetite, Lake Balaton
