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|Type:||Artigo de periódico|
|Title:||Some Characteristics Of Ca2+ Transport In Plant Mitochondria|
|Abstract:||Coupled mitochondria isolated from the white leaves of cabbage (Brassica Oleracea, var. capitata) were inactive in respiration-coupled Ca2+ accumulation, in contrast to mitochondria isolated from etiolated corn (Zea mays) which showed the ability to take up Ca2+ from the medium, although with a much lower activity than liver mitochondria. The addition of corn mitochondria to aerobic medium containing succinate as respiratory substrate and a free Ca2+ concentration of 40μM resulted in Ca2+ uptake with a decrease in free Ca2+ concentration until a steady state of about 2.0μM was reached and maintained constant for several minutes. Perturbation of this steady state by the addition of Ca2+ or EGTA was followed by Ca2+ uptake or release, respectively, until the steady state was attained at the original extramitochondrial free Ca2+ concentration. These results indicate that corn but not cabbage mitochon dria, as with some animal mitochondria, have the ability to buffer external Ca2+ and may be involved in the maintenance of Ca2+ homeostasis in the cell. © 1985.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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