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- W2275435045 abstract "Abstract In order to obtain a model which allows to directly study Mg 2+ influx into the cell, Mg 2+ deficiency was induced in the unicellular photoautotrophic flagellate Euglena gracilis. Lack of Mg 2+ in the culture medium leads to a number of morphological, biochemical, and physio logical changes in E uglena gracilis. The rate of cell division was reduced under Mg 2+ -free conditions. Subsequently an enlargement of the cells was observed and they changed from spindle-like to oval shape. The Mg 2+ -starved cells were well filled with paramylon granules, while their motility and vitality was not impaired. Concurrently with the larger cell size the protein-, carbohydrate-, and chlorophyll content of the cells increased. Further changes were observed in the surface carbohydrates. The proportion of cells with galactose, N-acetyl-galac-tosamine and mannose on the cell surface rose in the Mg 2+ -starved cultures, shown in a lectin-binding assay. Fucose was found on the pellicle of Mg 2+ -starved cells only. Cultivation of E uglena gracilis in Mg 2+ -free medium induced a drastic reduction of the intracellular Mg 2+ concentration already after 24 h (from 233 nmol/10 6 cells to 82 nmol/10 6 cells). When Mg 2+ was made available again, the Mg 2+ -starved cells took them up rapidly and the intracellular concentration of free Mg 2+ rose. As Mg 2+ depletion could be induced in Euglena gracilis easily by manipulating the culture conditions and as the cells remained viable, it was con cluded that this flagellate can be used as a model organism for studying the Mg 2+ uptake of eukaryotic cells." @default.
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- W2275435045 date "1996-04-01" @default.
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- W2275435045 title "Magnesium Starved Cells of Euglena gracilis - a Possible Model System for Studying Mg2+ Influx?" @default.
- W2275435045 doi "https://doi.org/10.1515/znc-1996-3-406" @default.
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