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Gradient

Definition

noun, plural: gradients

(1) A slope, which may be upward or downward.

(2) The degree of steepness or inclination, e.g., of a road or other geographic features.

(2) The rate of change of one variable relative to another, e.g. a physical quantity (e.g. temperature or pressure) increases or decreases relative to change in a given variable (e.g. distance).

(3) The rate of change in growth, metabolism, or physiological activity of a cell or organism.


Supplement

Word origin: From Latin gradiens, present participle of gradior (“‘to step, to walk’”).

Related phrases: concentration gradient, proton gradient, potential gradient.


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Help! ANT COLLONY!! I have a QUEEN ANT --- now what?

... and only at specific stages. The soil should always have some moist parts. If you water one side - just a bit, don't soak it - the ants have a gradient of moisture and can decide where they want to be. For most species, larvae and pupae need different conditions and they know best which ones. ...

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by Tricho
Mon Jun 16, 2014 3:48 am
 
Forum: Zoology Discussion
Topic: Help! ANT COLLONY!! I have a QUEEN ANT --- now what?
Replies: 2
Views: 1433

Re: Western transfer failure

... 1 hr. One gel transferred fine, another went backwards to blot paper after 1 hr. Did I just arrange backwards? Did lack of SDS mess with electric gradient? Correlation may not be causation, so I don't claim lack of SDS was the problem. It would be easy to do an experiment, though.

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by yanggers
Thu Feb 06, 2014 9:16 pm
 
Forum: Molecular Biology
Topic: Western transfer failure
Replies: 5
Views: 5075

Re: Diffusion and concentration gradient

1) the answer of Arlen1991 is completely irrelevant to your question! 2) Darby's analogy is perfect 3) it's simply about entropy . The molecules move randomly in any direction without any knowledge of presence of other molecules (alike or different). So just by following probability they spread rand...

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by JackBean
Thu Dec 26, 2013 5:49 pm
 
Forum: General Discussion
Topic: Diffusion and concentration gradient
Replies: 7
Views: 5008

Diffusion and concentration gradient

... and men, randomly moving across a sidewalk from one side of a park to the other. If the movement is random, men will gradually diffuse along their gradient, women along theirs, and even though they are all "people," the process still works...

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by Darby
Fri Dec 20, 2013 3:14 pm
 
Forum: General Discussion
Topic: Diffusion and concentration gradient
Replies: 7
Views: 5008

Re: Diffusion and concentration gradient

I don't see the problem. It's all about net movement in each direction. If there is more O2 in region A than in region B, there will be more movement of O2 from A to B than from B to A. After all, O2 can't diffuse out of region B if it isn't already present in region B. If B is filled with mostly CO...

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by wildfunguy
Thu Dec 19, 2013 12:51 am
 
Forum: General Discussion
Topic: Diffusion and concentration gradient
Replies: 7
Views: 5008
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