dark current

dark current
(of retina) Current caused by constant influx of sodium ions into the rod outer segment of retinal photoreceptors, and that is blocked by light (leading to hyperpolarization). The plasma membrane sodium channel is controlled through a cascade of amplification reactions initiated by photon capture by rhodopsinin the disc membrane.

Dictionary of molecular biology. 2004.

Look at other dictionaries:

  • Dark current — is the constant response exhibited by a receptor of radiation during periods when it is not actively being exposed to light. It may refer to: Dark current (biochemistry) : The depolarizing current, carried by Na+ ions, that flows into a… …   Wikipedia

  • dark current — tamsinė srovė statusas T sritis automatika atitikmenys: angl. dark current vok. Dunkelstrom, m rus. темновой ток, m pranc. courant d obscurité, m …   Automatikos terminų žodynas

  • dark current — tamsinė srovė statusas T sritis fizika atitikmenys: angl. dark current vok. Dunkelstrom, m rus. темновой ток, m pranc. courant d’obscurité, m; courant noir, m …   Fizikos terminų žodynas

  • dark current — noun The temperature dependant current that flows in a photodetector when no light is shining on it …   Wiktionary

  • dark current — noun the residual electric current flowing in a photoelectric device when there is no illumination …   English new terms dictionary

  • dark current — noun : the current through a photoelectric or photoconductive cell when an electromotive force is applied in the absence of light …   Useful english dictionary

  • Dark current spectroscopy — is a technique that is used to determine contaminants in silicon. This science article is a stub. You can help Wikipedia by expanding it …   Wikipedia

  • Dark current (physics) — In physics and in electronic engineering, dark current is the relatively small electric current that flows through photosensitive devices such as a photomultiplier tube, photodiode, or charge coupled device even when no photons are entering the… …   Wikipedia

  • Dark current (chemistry) — In analytical chemistry, dark current refers to the constant response produced by a spectrochemical receptor, even in the absence of radiation. This response adds to the signal produced when the receptor is used to measure light and so must be… …   Wikipedia

  • dark-current noise — tamsinės srovės triukšmas statusas T sritis fizika atitikmenys: angl. dark current noise vok. Dunkelstromrauschen, n rus. шум темнового тока, m pranc. bruit de courant d’obscurité, m …   Fizikos terminų žodynas

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