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Vorlesung 7: Transport löslicher Substanzen
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Transport löslicher Substanzen
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Vorlesung 7: Transport löslicher SubstanzenMitchell: Membran als Battierie
Energieeinsatz Gradient
(Εκτέλεση εργασίας)
Em (=Membranpotenzial) von -100 bis -200Mv
, Malat=Anion
Elektroschemischer Gradient: elektroscher + Konzentrationsgradient Energiebedarf für Transport
Elektrischer Gradient treibt: Kationenimport und Anionenexport
Ionenverteilung von Nernst Gleichung beschrieben
Nernst-Gleichung: im Gleichgewicht wird Konzentrationsunterschied eines Ions durch
Spannungsunterschied zwischen Kompartimenten kompensiert (Στην ισορροπία, η διαφορά
συγκέντρωσης ενός ιόντος αντισταθμίζεται από τη διαφορά τάσης μεταξύ των διαμερισμάτων)
Protonentransport bestimmt wesentlich das Membranpotenzial
• Nernst Potenzial für K+ annährend Diffusionspotenzial ( Membranpotenzial ~ -80
bis -50 mV)
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