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Pressure gradient and concentratioin gradient

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Pressure gradient and concentratioin gradient

Postby jacks » Mon Aug 01, 2005 9:57 pm

what is the difference between the two??? What is bukl flow???????
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Postby Dr.Stein » Tue Aug 02, 2005 1:51 am

Pressure gradient: from higher pressure to lower pressure
For example: air flows according to pressure gradient

Concentration gradient
: from higher concentration to lower concentration
For example:
- passive transport (diffusion, osmosis, facilitated diffusion) flows according to concentration gradient
- active transport flows against concentration gradient

Do you mean "bulk flow"? I ever heard about that but unfortunately I forgot what it is. I should open my book :)
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Postby iri_black » Tue Aug 02, 2005 6:30 am

Granular matter does not flow homogeneously like a fluid when submitted to external stress, but usually forms rigid regions separated by marrow shear bands where the material yealds and flows(like in avalanches).
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Postby sdekivit » Tue Aug 02, 2005 8:00 am

important to know is that when you go with the gradient energy can be stored as ATP (oxidative phosphorylation) or an action potential in nevers can occur ( Na/K-gradients) for example. When you go against the gradient ATP is needed (for example the Na/K ATPase in cell membranes)

From thermodynamics, it follows that the processes with the gradient can occur spontaneous while the reverse are not spontaneous.
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Postby jacks » Tue Aug 02, 2005 11:21 am

Thanks for all the help!!!! Jacks
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Postby Dr.Stein » Tue Aug 02, 2005 12:55 pm

No problem. We like to help each other :wink:
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