Demontis G C, Longoni B, Gargini C, Cervetto L
Istituto Policattedra di Discipline Biologiche, Università di Pisa, Italy.
Arch Ital Biol. 1997 Mar;135(2):95-109.
The effects of temperature on rod sensitivity and adaptation are analysed in the general context of the energy requirements of photoreception. The dependence of adaptation on the [Na]i turn-over appears to be critical in mammalian rods where the metabolic load is particularly heavy because of both temperature conditions and large Na+ influx. Estimates of the energy dissipated by rods in darkness and during bright illumination show that the metabolic load is reasonably well distributed. From this analysis it also results that most of the energy, which a rod dissipates in both darkness and light, is needed to keep [Na]i and [Ca]i low.
在光感受器能量需求的总体背景下，分析了温度对视杆细胞敏感性和适应性的影响。在哺乳动物视杆细胞中，由于温度条件和大量钠离子内流，代谢负荷特别重，适应性对细胞内钠离子周转的依赖性似乎至关重要。对视杆细胞在黑暗和强光照射期间消耗的能量估计表明，代谢负荷分布较为合理。从该分析还可得出，视杆细胞在黑暗和光照下消耗的大部分能量用于维持细胞内低钠离子和钙离子浓度。
