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Transition temperature

transition temperature

(Science: chemistry) The temperature at which there is a transition in the organisation of, for example: the phospholipids of a membrane where the transition temperature marks the shift from fluid to more crystalline. Usually determined by using an arrhenius plot of activity against the reciprocal of absolute temperature, the transition temperature being that temperature at which there is an abrupt change in the slope of the plot. In membranes such phase transitions tend to be inhibited by the presence of cholesterol.


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Formation of helices in heterogeneous protein vs. homogeneou

... for helices being sequence dependent. Relate it to the coil-helix transition, fractional helicity and melting temperature.

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by JordanGo
Fri Oct 19, 2012 8:16 pm
 
Forum: Cell Biology
Topic: Formation of helices in heterogeneous protein vs. homogeneou
Replies: 0
Views: 1145

Re: (Facilitated Diffusion), Carrier protein.

... is energy in the system that can cause motion; the key is whether the transition energy required to go from one conformation to the other is low enough. Wiggling is free at room temperature. Moving past a difficult energy barrier can be expensive, a little thermal ...

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by jonmoulton
Fri Jun 24, 2011 4:29 pm
 
Forum: Cell Biology
Topic: (Facilitated Diffusion), Carrier protein.
Replies: 3
Views: 8773

Cell Fusion experiment

... the membrane proteins C) the fused cell was incubated above the phase transition temperature D) the fused cell is in the process of dividing back into the two donor cells E) ...

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by hannahzarzar
Thu May 19, 2011 12:06 am
 
Forum: Cell Biology
Topic: Cell Fusion experiment
Replies: 5
Views: 4878

Enzymes and activation energy.

... being changed into a different molecule, and without raising the temperature. However, an enzyme does not add energy to a reaction but rather ... increases the rate of reactivity of the substrate and stabilizes the transition state. New to biology

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by NewtoBiology
Wed Jul 08, 2009 2:09 am
 
Forum: Molecular Biology
Topic: Enzymes and activation energy.
Replies: 5
Views: 39797

Electrons... To be or not to be...

... because of the their free valence electrons and in the case of transition metals, they have a d orbital which also contribute carrier electrons. ... being big in insulators which means there are few carriers at room temperature.

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by mith
Fri Feb 13, 2009 4:23 pm
 
Forum: General Discussion
Topic: Electrons... To be or not to be...
Replies: 14
Views: 7890
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