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Cationic liposomes can efficiently carry nucleic acids into mammalian cells. This property is tightly connected with their ability to fuse with negatively charged natural membranes (i.e. the plasma membrane and endosomal membrane). We used FRET to monitor and compare the efficiency of lipid mixing of two liposomal preparations — one of short-chained diC14-amidine and one of long-chained unsaturated...
Hemolysis was used as an endpoint for the measurement of damage to the plasma membrane in human erythrocytes after a single or a double heat shock. The thermotolerance of erythrocytes is a transitional phenomenon, reaching its maximum at a 3-hour incubation at 37°C between the heat shocks.
There is a significant number of data confirming that the maintenance of calcium homeostasis in a living cell is a complex, multiregulated process. Calcium efflux from excitable cells (i.e., neurons) occurs through two main systems an electrochemically driven Na+/Ca2+ exchanger with a low Ca2+ affinity (K0.5 = 10-15 µM), and a plasmalemmal, specific Ca2+-ATPase, with a high Ca2+ affinity (K0.5 <0...
Pisum arvense plants were subjected to 5 days of nitrogen deprivation. Then, in the conditions that increased or decreased the root glutamine and asparagine pools, the uptake rates of 0.5 mM NH₄⁺ and 0.5 mM K⁺ were examined. The plants supplied with 1 mM glutamine or asparagine took up ammonium and potassium at rates lower than those for the control plants. The uptake rates of NH₄⁺ and K⁺ were not...
nfluence of immobilization in Ca-alginate gel on K+ (86Rb+) uptake by Chlorella vulgaris cells was investigated. In immobilized cells the K+ influx was decreased by 20-25% in comparison to suspended cells. The addition of Ca2+ (0.1-10 mM) into incubation medium considerably increased K+ uptake in suspension. By contrast, free alginate (0.01-1%) drastically inhibited the isotope uptake in the same...
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