caa a22 4500 465794769 CHVBK 20180323112034.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF00146554 doi (NATIONALLICENCE)springer-10.1007/BF00146554 Changes in [K+]0 at the vitreal surface compared with those around receptors in the isolated rabbit retina [Elektronische Daten] [Wolf-Ulrich Mättig, Renate Hanitzsch] Isolated rabbit retinas were superfused from the receptor side with a plasma-saline mixture kept at 35° C. The vitreal side was exposed to an atmosphere of humidified warm oxygen. In one study the second-order neuronal activity was suppressed with aspartate and glutamate; in another study transmission was not blocked. When all neurons were active, [K+]0 around receptors was 4.5 ± 0.4 mM in the dark. During a long (60s) exposure to light stimulus, [K+]0 dropped to 73% of the dark value and reaccumulated to 80%. At the vitreal surface, [K+]0 in the dark was 4.7 ± 0.8 mM. During the 60s light stimulus, [K+]0 increased transiently, dropped to 83% of the dark value, then increased again to 91%. A continuous decrease of [K+]0 at the vitreal surface during long light stimuli concurrent with the increase of [K+]0 around receptors would indicate that the spatial buffering capability of the Müller cells contributes to the reaccumulation of potassium. Such a decrease, however, was not detected. After the blockage of transmission, [K+]0 values did not vary significantly from those after light stimulus in unblocked preparations. In the dark, [K+]0 was 5.2 ± 0.9mM at the vitreal surface and 4.6 ± 0.4 mM around the receptors. Kluwer Academic Publishers, 1990 aspartate nationallicence ERG nationallicence extracellular potassium nationallicence rabbit retina nationallicence Mättig Wolf-Ulrich Carl-Ludwig-Institute of Physiology, KMU, Leipzig, Germany aut Hanitzsch Renate Carl-Ludwig-Institute of Physiology, KMU, Leipzig, Germany aut Documenta Ophthalmologica Kluwer Academic Publishers 75/2(1990-09-01), 181-187 0012-4486 75:2<181 1990 75 10633 https://doi.org/10.1007/BF00146554 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00146554 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mättig Wolf-Ulrich Carl-Ludwig-Institute of Physiology, KMU, Leipzig, Germany aut NATIONALLICENCE 700 1- Hanitzsch Renate Carl-Ludwig-Institute of Physiology, KMU, Leipzig, Germany aut NATIONALLICENCE 773 0- Documenta Ophthalmologica Kluwer Academic Publishers 75/2(1990-09-01), 181-187 0012-4486 75:2<181 1990 75 10633 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer