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- W2076271195 abstract "The corneal endothelium is a fluid-transporting epithelium. As other similar tissues, it displays an electrical potential of ensuremath{sim}1 mV (aqueous side negative) across the entire layer [transendothelial potential difference (TEPD)]. It appears that this electrical potential is mainly the result of the transport of anions across the cell layer (from stroma to aqueous). There is substantial evidence that the TEPD is related linearly to fluid transport; hence, under proper conditions, its measure could serve as a measure of fluid transport. Furthermore, the TEPD is not steady; instead, it displays a spectrum of frequency components (0--15 Hz) recognized recently using Fourier transforms. Such frequency components appear due to charge-separating (electrogenic) processes mediated by epithelial plasma membrane proteins (both ionic channels and ionic cotransporters). In particular, the endothelial TEPD oscillations of the highest amplitude (1--2 Hz) were linked to the operation of so-called sodium bicarbonate cotransporters. However, no time localization of that activity could be obtained with the Fourier methodology utilized. For that reason we now characterize the TEPD using wavelet analysis with the aim to localize in time the variations in TEPD. We find that the mentioned high-amplitude oscillatory components of the TEPD appear cyclically during the several hours that an endothelial preparation survives in vitro. They have a period of 4.6 ifmmodepmelsetextpmfi{} 0.4 s on average ($n$=4). The wavelet power value at the peak of such oscillations is 1.5 ifmmodepmelsetextpmfi{} 0.1 mV${}^{2}$ Hz on average ($n$ $=$ 4), and is remarkably narrow in its distribution." @default.
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- W2076271195 date "2011-09-19" @default.
- W2076271195 modified "2023-10-08" @default.
- W2076271195 title "Wavelet analysis of corneal endothelial electrical potential difference reveals cyclic operation of the secretory mechanism" @default.
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- W2076271195 doi "https://doi.org/10.1103/physreve.84.032902" @default.
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