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In chemical thermodynamics, an endergonic reaction (from Greek ἔνδον (endon) 'within' and ἔργον (ergon) 'work'; also called a heat absorbing nonspontaneous reaction or an unfavorable reaction) is a chemical reaction in which the standard change in free energy is positive, and an additional driving force is needed to perform this ...
Limited synthesis of adenosine triphosphate impairs many cellular transport mechanisms that utilize ATP to drive energetically unfavorable processes that transport ions and molecules across the cellular membrane. For example, the membrane potential of the cell is maintained by the sodium-potassium ATPase pump. Failure of the pump results in ...
Anabolism usually involves reduction and decreases entropy, making it unfavorable without energy input. [6] The starting materials, called the precursor molecules, are joined using the chemical energy made available from hydrolyzing ATP, reducing the cofactors NAD + , NADP + , and FAD , or performing other favorable side reactions. [ 7 ]
Large particles are more energetically favorable since, continuing with this example, more atoms are bonded to 6 neighbors and fewer atoms are at the unfavorable surface. As the system tries to lower its overall energy, molecules on the surface of a small particle (energetically unfavorable, with only 3 or 4 or 5 bonded neighbors) will tend to ...
A reaction with ∆H°<0 is called exothermic reaction while one with ∆H°>0 is endothermic. Figure 8: Reaction Coordinate Diagrams showing favorable or unfavorable and slow or fast reactions [7] The relative stability of reactant and product does not define the feasibility of any reaction all by itself.
Hsp104 monomer is composed of two NBDs (Nucleotide Binding Sites) NBD1 and NBD2 which communicate through allosteric communication . Located on the C-terminus of NBD1 there are around 125 residues that link both NBDs .In hsp104 NBD1 is where ATP hydrolysis occurs, NBD2 C-terminus is shown to express the configuration of the structure by nucleotide-dependent hexamerazation.
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Syntrophy, in the context of microbial metabolism, refers to the pairing of multiple species to achieve a chemical reaction that, on its own, would be energetically unfavorable. The best studied example of this process is the oxidation of fermentative end products (such as acetate, ethanol and butyrate) by organisms such as Syntrophomonas ...
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