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- W2079227618 abstract "Rhodopsin-mediated photoreceptor currents, IP, of the unicellular alga Chlamydomonas reinhardtii were studied under neutral and acidic conditions. We characterized the kinetically overlapping components of the first, flash-induced inward current recorded from the eye, IP1, as a low- and high-intensity component, IP1a and IP1b, respectively. They peak between 1 and 10 ms after the light-flash and are both likely to be carried by Ca2+. IP1a and IP1b exhibit half-maximal photon flux densities, Q1/2, of ∼0.14 and 58 μE m−2, and maximal amplitudes of ∼4.9 and 38 pA, respectively. At acidic extracellular pH values (pH 3–5), both IP1 currents are followed by distinct H+ currents, IP2a and IP2b, with maxima after ∼5 and 100 ms, respectively. Because the Q1/2 values of IP1b and IP2b virtually coincide with Q1/2 of rhodopsin bleaching, we suggest that the respective conductances G1b and G2b are closely coupled to the rhodopsin, whereas the low light-saturating conductances G1a and G2a reflect transducer-activated states of a second rhodopsin photoreceptor system." @default.
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- W2079227618 date "2002-02-01" @default.
- W2079227618 modified "2023-09-27" @default.
- W2079227618 title "Evidence for a Light-Induced H+ Conductance in the Eye of the Green Alga Chlamydomonas reinhardtii" @default.
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- W2079227618 doi "https://doi.org/10.1016/s0006-3495(02)75436-2" @default.
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