黑藻中氢离子和氯离子通量的定位
Localization of hydrogen ion and chloride ion fluxes in Nitella.
作者信息
Spear D G, Barr J K, Barr C E
出版信息
J Gen Physiol. 1969 Sep;54(3):397-414. doi: 10.1085/jgp.54.3.397.
Abstract
Alternating bands of acid and base formation have been detected along the length of the internodal cell of Nitella clavata when it is illuminated, while in the dark this phenomenon is minimal. Chloride influx occurs only or largely in the acid-extruding regions, and this is also a light-dependent ion movement. Chloride efflux is slightly dependent on illumination and is not localized as are H(+) efflux and Cl(-) influx. The results obtained support Kitasato's (1968) proposal that a large passive H(+) influx is balanced by an active efflux of this ion. Transport mechanisms suggested by the correlations of Cl(-) and HCO(3) (-) influxes with H(+) extrusion are discussed.
摘要
当光照时，在棒形丽藻节间细胞的长度方向上检测到了交替出现的酸形成带和碱形成带，而在黑暗中这种现象则很微弱。氯离子内流仅发生在或主要发生在酸分泌区域，这也是一种光依赖的离子运动。氯离子外流对光照有轻微的依赖性，并且不像氢离子外流和氯离子内流那样具有局部性。所获得的结果支持了北里（1968年）的提议，即大量的被动氢离子内流由该离子的主动外流来平衡。讨论了由氯离子和碳酸氢根离子内流与氢离子外排的相关性所暗示的转运机制。
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