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The Government of Canada’s terminology and linguistic data bank.
ENERGIA LIBRE [1 record]
Record 1 - internal organization data 2011-01-07
Record 1, English
Record 1, Subject field(s)
- Biological Sciences
- Biotechnology
Record 1, Main entry term, English
- free energy
1, record 1, English, free%20energy
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
Measure of a system's ability to do work. It is defined by F = U - TS, where U is the internal energy. For a reversible isothermal process, [delta]F represents the useful work available. 2, record 1, English, - free%20energy
Record number: 1, Textual support number: 1 CONT
Reactions that release a large quantity of free energy are those that have a very large negative [delta]G and create much disorder. Such reactions will have a strong tendency to occur, although the rate at which they do so will depend on other factors, such as the availability of specific enzymes. Conversely, reactions with a positive value of [delta]G create net order in the universe and cannot occur spontaneously. Such energetically unfavorable reactions will happen only if they are coupled to a second reaction with a negative [delta]G so large that the [delta]G of the entire process is negative. 3, record 1, English, - free%20energy
Record number: 1, Textual support number: 1 OBS
The change in free energy, G, is a measure of the tendency of a reaction at constant pressure to proceed spontaneously. 4, record 1, English, - free%20energy
Record 1, French
Record 1, Domaine(s)
- Sciences biologiques
- Biotechnologie
Record 1, Main entry term, French
- énergie libre
1, record 1, French, %C3%A9nergie%20libre
correct, feminine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
Fonction d'état d'un système à l'équilibre, notée souvent F et égale à U - TS, où U est l'énergie interne, T la température et S l'entropie du système. (Lors d'une transformation isotherme, la variation de cette énergie est égale au travail reçu par le système.) 2, record 1, French, - %C3%A9nergie%20libre
Record number: 1, Textual support number: 1 CONT
Notons que l'enzyme ne détermine pas le sens de la réaction; la proportion de molécules X et Y, à l'équilibre, dépend de facteurs thermodynamiques : la réaction favorisée est celle qui minimise ce que l'on appelle l'énergie libre. (L'énergie libre d'un système est égale à son énergie totale diminuée de son entropie, c'est-à-dire d'une quantité qui caractérise le désordre du système.) 3, record 1, French, - %C3%A9nergie%20libre
Record number: 1, Textual support number: 1 OBS
Pour caractériser une réaction, on parle aussi de variation d'enthalphie libre [delta]G = [delta]U + P[delta]V - T[delta]S où P est la pression et [delta]V, la variation de volume. En biochimie, on peut admettre que [delta]V = 0, car les variations de volume pour les réactions ayant lieu en solution sont négligeables. Ainsi, [delta]G = [delta]U - T[delta]S = [delta]F. Par conséquent [delta]F se confond avec [delta]G. Ceci est vrai surtout si les réactions font intervenir des liquides et des solides en solution (et aucun gaz) aux températures physiologiques qui sont basses. 4, record 1, French, - %C3%A9nergie%20libre
Record 1, Spanish
Record 1, Campo(s) temático(s)
- Ciencias biológicas
- Biotecnología
Record 1, Main entry term, Spanish
- energía libre
1, record 1, Spanish, energ%C3%ADa%20libre
correct, feminine noun
Record 1, Abbreviations, Spanish
Record 1, Synonyms, Spanish
Record 1, Textual support, Spanish
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