Question

Who is single layered but maintain cellular osmotic pressure

Answer 1

I have measured water activites on some of my samples (seawater), and calculated the (total) osmotic pressure.

But I assume that because of the low rejection coefficients for Na and Cl, they do not contribute fully to the osmotic pressure influencing the membrane?

I am trying to see how the osmotic pressure varies over time when I run seawater through the NF setup (batch process), but the osmotic pressure calculated from the water activity tells me nothing. 

Answer 2

I have measured water activites on some of my samples (seawater), and calculated the (total) osmotic pressure.

But I assume that because of the low rejection coefficients for Na and Cl, they do not contribute fully to the osmotic pressure influencing the membrane?

I am trying to see how the osmotic pressure varies over time when I run seawater through the NF setup (batch process), but the osmotic pressure calculated from the water activity tells me nothing.