TERMIUM Plus®

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ENCOMBREMENT STERIQUE [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-10-26

English

Subject field(s)
  • Scientific Research Equipment
  • Medical Instruments and Devices

French

Domaine(s)
  • Matériel et équipement (Recherche scientifique)
  • Instruments et appareillages médicaux

Spanish

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Record 2 1998-08-26

English

Subject field(s)
  • Chemistry
  • Genetics
DEF

Slowing of the rate of a chemical reaction owing to the presence of structures on the reagents that mechanically interfere with the motions associated with the reaction, typically by obstructing the reaction site.

French

Domaine(s)
  • Chimie
  • Génétique
DEF

Accumulation de groupements volumineux autour d'un centre réactionnel, qui en rend l'accès difficile.

Spanish

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Record 3 1990-01-15

English

Subject field(s)
  • Biological Sciences
DEF

Nonbonded repulsions between atoms or groups of atoms in a molecule or transition state. For example, it is greater in cis-2-butene than in trans-2-butene because of the closeness of the two methyl groups in the former.

CONT

When an enzyme is immobilized by using a water-insoluble polymer carrier, the enzyme activity toward substrates of high molecular weight is markedly reduced due to steric hindrance which obstructs the approach of the substrate to the enzyme molecule. However, the activity of immobilized enzyme toward substrates of low molecular weight is similar to that of the native enzyme because the substrate can easily approach the enzyme molecule.

French

Domaine(s)
  • Sciences biologiques
DEF

Accumulation de groupements volumineux autour d'un centre réactionnel, qui en rend l'accès difficile.

CONT

Tout comme il interagit avec la structure tridimensionnelle de l'enzyme, le microenvironnement imposé par l'immobilisation peut en modifier le comportement apparent pour des raisons purement mécaniques d'encombrement stérique. L'accessibilité des différents sites d'une enzyme est en effet fortement conditionnée par la méthode d'immobilisation choisie. La différence avec l'enzyme soluble est d'autant plus marquée que le substrat ou l'effecteur sont de taille plus importante.

Spanish

Save record 3

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