CMB1004/L23 Electro-osmotic Effects in Cells Flashcards
What is the equation for the Gibbs free energy considering individual components?
G = (na)(mew.a) + (nb)(mew.b)
What equation gives the chemical potential of a solute?
mewA = mewA(T) +RTln([A])
What is RTln([A])?
Entropic effect of mixing A with other components
What is formed due to an imbalance of permeable and impermeable ions?
Strong electric field
What is the effect of a potential difference across a membrane?
Opposed transfer of further ions
What is the Nernst potential?
Electrical potential difference required to stop the flow of ions arising from a concentration difference
What is the Nernst equation?
Delta(mewA) + RTln([Ai]/[Ao]) = 0
What is the Faraday constant?
The charge of 1 mole of electrons
What is the equation for change in electrical potential energy?
Delta(U) = qDelta(V)
What is the equation for standard chemical potential for one mole of substance?
Delta(mewAO) = zF*Delta(V)
What is the equation for equilibrium across the membrane? (Nernst)
V(nernst) = - (RT/zF)ln([Ai]/[Ao]) = 0
What is the Donnan membrane potential?
Unequal distribution of ions across a membrane when equilibrated with a electrolyte
What equation is turgor pressure given by?
P = Delta(Osm)*RT
How do cells withstand turgor pressure?
Na+/K+ pumps
Cells are not in electrochemical equilibrium
What biological process sets up a large proton concentration (pH) imbalance?
Respiration
