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MICROAMBIENTE [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-02-09

English

Subject field(s)
  • Biological Sciences
  • Biotechnology
DEF

The immediate vicinity of the bound enzyme.

CONT

There are two distinct ways in which a polymer support might affect the microenvironment surrounding an immobilized enzyme. The first may be considered to be a partitioning effect. By virtue of its own physical chemistry, the polymer may attract (or repel) substrate, product, inhibitor, or other molecules to its surface thus concentrating (or depleting) them in the immediate vicinity of the enzyme. The second way in which the polymer may affect the enzyme's microenvironment may be by presenting itself as a barrier to the free diffusion of molecules both to and from the enzyme.

French

Domaine(s)
  • Sciences biologiques
  • Biotechnologie
DEF

Environnement immédiat dans lequel agit l'enzyme.

CONT

Les conditions de microenvironnement imposées permettent de modifier considérablement la catalyse notamment du point de vue de la spécificité : seules les applications analytiques nécessitent une spécificité absolue. Pour les applications de bioconversions, il est intéressant de pouvoir exploiter pour une large gamme de substrats, une spécificité restreinte (régio- ou stéréospécificité) ex : isomération de glucose en fructose par la xylose isomérase. [...] Cette spécificité peut elle-même dépendre du microenvironnement : ainsi la β galactosidase d'E. Coli ne peut hydrolyser à l'état soluble les galactocérébrosides très hydrophobes. Elle acquiert cette capacité de reconnaissance par inclusion dans des liposomes.

Spanish

Campo(s) temático(s)
  • Ciencias biológicas
  • Biotecnología
Save record 1

Record 2 2006-11-03

English

Subject field(s)
  • Ecosystems
DEF

The environment of a very small, specific area.

CONT

Theoretically, all sandfly species are able to be colonized given appropriate temperature, humidity and media resembling the natural conditions... However, some species though reared through at least one generation, have not yet been colonized. Presumably, unknown factors that are not mimicked in the laboratory, and reflect the micro-environment of the species in nature have limited the ability to propagate these species.

French

Domaine(s)
  • Écosystèmes
DEF

Biotope élémentaire possédant des propriétés spécifiques.

OBS

biotope : Composante d'un écosystème constituée par des dimensions physicochimiques et spatiales.

Spanish

Campo(s) temático(s)
  • Ecosistemas
Save record 2

Record 3 2003-01-30

English

Subject field(s)
  • Cytology

French

Domaine(s)
  • Cytologie

Spanish

Campo(s) temático(s)
  • Citología
Save record 3

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