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Descriptor English: Substrate Cycling
Descriptor Spanish: Ciclo del Sustrato
Descriptor ciclación de sustratos
Entry term(s) ciclación fútil
Scope note: Conjunto de reacciones desequilibradas de oposición, catalizadas por diversos enzimas que actúan simultáneamente con, al menos, una de las reacciones impulsadas por la hidrólisis de ATP. Los resultados del ciclo son que la energía del ATP se agota, produciéndose calor, sin obtenerse ninguna conversión neta de sustrato a producto. Como ejemplos de ciclos de sustrato tenemos el ciclo de las vías de gluconeogénesis y glicólisis, y las vías de triglicéridos y ácidos grasos. Las tasas de los ciclos de sustratos pueden incrementarse en muchas veces cuando se asocian a estados hipermetabólicos resultantes de quemaduras graves, exposición al frío, hipertiroidismo, o ejercicio agudo.
Descriptor Portuguese: Ciclização de Substratos
Descriptor French: Recyclage du substrat
Entry term(s): Cycles de substrats
Cycles futiles
Recyclage futile
Tree number(s): G02.111.833
G03.295.835
RDF Unique Identifier: https://id.nlm.nih.gov/mesh/D015219
Scope note: A set of opposing, nonequilibrium reactions catalyzed by different enzymes which act simultaneously, with at least one of the reactions driven by ATP hydrolysis. The results of the cycle are that ATP energy is depleted, heat is produced and no net substrate-to-product conversion is achieved. Examples of substrate cycling are cycling of gluconeogenesis and glycolysis pathways and cycling of the triglycerides and fatty acid pathways. Rates of substrate cycling may be increased many-fold in association with hypermetabolic states resulting from severe burns, cold exposure, hyperthyroidism, or acute exercise.
Annotation: restricted to enzyme activity; almost never IM; coord NIM with specific enzyme (IM)
Allowable Qualifiers: DE effets des médicaments et des substances chimiques
GE génétique
IM immunologie
PH physiologie
RE effets des radiations
DeCS ID: 23842
Unique ID: D015219
Documents indexed in the Virtual Health Library (VHL): Click here to access the VHL documents
Date Established: 1989/01/01
Date of Entry: 1988/05/11
Revision Date: 2016/07/01
Recyclage du substrat - Preferred
Concept UI M0023381
Preferred term Recyclage du substrat
Cycles futiles - Narrower
Concept UI M0023382
Preferred term Cycles futiles
Entry term(s) Cycles de substrats
Recyclage futile



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