The Absorption of Sodium Ions by the Crayfish, Astacus Pallipes Lereboullet : I. The Effect of External and Internal Sodium Concentrations
The Absorption of Sodium Ions by the Crayfish, Astacus Pallipes Lereboullet : I. The Effect of External and Internal Sodium Concentrations
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小龙虾 (Astacus Pallipes Lereboullet) 对钠离子的吸收：I. 外部和内部钠浓度的影响
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发表时间：
1959
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通讯作者：
J. Shaw
中科院分区：
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作者：
J. Shaw
1.研究了外源和内源钠离子浓度对小龙虾吸收钠离子的影响。2.正常钠内流，用24钠测量，由0.3 mm/L开始，氯化钠溶液为1.5微米/10克体重/小时。去离子水中钠的损失率大致相同。3.钠的净损失降低了钠平衡所需的外部钠浓度。最低平衡浓度约为0.04mM/L·氯化钠。4.外源钠浓度与钠内流量之间呈非线性关系。流入的最大流量约为10微米/10克/小时。在外部浓度约为。1 mm./L。5.24 Na内流是低外源浓度下钠摄取速率的真实测量。在较高浓度下，流入可能超过吸收速率约20%。6.钠的净损失使流入量增加了三到五倍。体内总钠的5%-10%的损失增加了从正常水平到最大水平的内流。1%的变化对涌入有显著影响。体内钠含量的变化反映了血钠浓度的变化。7.建议了一种方案，通过该方案，外部和内部的钠浓度在流入时共同作用，以产生一个自我调节系统，使动物保持钠平衡。
1. The effects of external and internal sodium concentrations on the uptake of sodium ions by the crayfish, Astacus pallipes , has been studied. 2. The normal sodium influx, measured with 24 Na, from O.3 mM /l. NaCl solution is 1.5 µM./10 g. body weight/hr. The rate of loss of sodium to de-ionized water has roughly the same value. 3. Net loss of sodium reduces the external sodium concentration required for sodium balance. The minimum equilibrium concentration is about 0.04 mM./l. NaCl. 4. The relation between the external sodium concentration and the sodium influx is non-linear. The influx has a maximum of about 10 µM./10 g./hr. at an external concentration of approx. 1 mM./l. 5. The 24 Na influx is a true measure of the sodium uptake rate at low external concentrations. At higher concentrations the influx may exceed the uptake rate by some 20%. 6. Net loss of sodium increases the influx by three to five times. Loss of 5-10% of the total internal sodium increases the influx from the normal to the maximum level. A 1% change has a significant effect on the influx. Changes in the internal sodium content reflect changes of the blood sodium concentration. 7. A scheme is suggested whereby the external and internal sodium concentrations interact together on the influx to produce a self-regulating system which maintains the animal in sodium balance.