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Diffusion and concentration gradient

Hello, We have been working on the respiratory system and once more this involved concentration gradients. I more or less understand how it works by now (it's been mentioned a lot in other systems as well) but what intrigues me is that the concentration gradient can be ...

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by Aymeric
Sun Dec 15, 2013 1:02 am
Forum: General Discussion
Topic: Diffusion and concentration gradient
Replies: 7
Views: 9680

Re: [NEUROSCIENCE]-Two Questions about AP Propagation

Tertiary supporting answer for question #1 are the active pumps which assist in the purpose of establishing a voltage, offseting the natural gradients of the ions through the leak channels.

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by aj415
Fri Aug 24, 2012 10:59 pm
Forum: Human Biology
Topic: [NEUROSCIENCE]-Two Questions about AP Propagation
Replies: 5
Views: 6275

organs shape

... put forward based on a previous model of regeneration postulates that the individual cells of an organ primordium measure the concentration gradients of specific signaling molecules, such as Dpp in the Drosophila wing disc and Shh in the vertebrate limb bud (Day and Lawrence 2000). In immature ...

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by animus
Thu Jun 28, 2012 4:41 pm
Forum: Human Biology
Topic: organs shape
Replies: 1
Views: 5550

Gene enhancers/repressors in Drosophilia stripes

I know it has to deal with having repressors interacting with the enhancers at different gradients along the fly and when enhancers are "on", transcription can occur and a stripe can be made. I just can't seem to understand the details behind this.

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by bwooten28
Wed Apr 04, 2012 4:56 am
Forum: Molecular Biology
Topic: Gene enhancers/repressors in Drosophilia stripes
Replies: 1
Views: 1428


... net loss or uptake of a water molecule occurs by osmosis, the diffusion of water across a membrane. This is passive transport requiring no energy. Gradients of water potential drive the osmotic movement of water from cell to cell within root and leaf tissue. Does that all sound correct? If you ...

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by killian07
Mon Dec 12, 2011 4:23 am
Forum: General Discussion
Topic: Diffusion
Replies: 2
Views: 4137
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