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MEMBRANE LIQUIDE [3 records]

Record 1 2012-07-13

English

Subject field(s)
  • Bioengineering
  • Biotechnology
DEF

Thin film made up of liquid (as opposed to solid) which is stable in another liquid (usually water).

OBS

Thus the liquid must not dissolve in the water, but nevertheless must be prevented from collapsing into small droplets.

OBS

There are, in fact, two basic types of liquid membranes, an Emulsion Liquid Membrane (ELM), and an Immobilized Liquid Membrane (ILM), also called a Supported Liquid Membrane.

French

Domaine(s)
  • Technique biologique
  • Biotechnologie
CONT

La structure des matériaux permet de distinguer trois types de membranes : les membranes isotropes, elles ont des propriétés structurelles constantes sur toute leur épaisseur; les membranes anisotropes, leur structure composite varie de la surface de la membrane vers l'intérieur; les membranes liquides.

Spanish

Campo(s) temático(s)
  • Bioingeniería
  • Biotecnología
DEF

Fina película de líquido estable en otro líquido (normalmente agua).

OBS

De esta forma, el líquido no se disuelve en el agua, aunque debe impedirse que se hunda al fragmentarse en pequeñas gotas.

Save record 1

Record 2 2011-08-09

English

Subject field(s)
  • Biological Sciences
CONT

Enzymes can be immobilized within microcapsules that have either a permanent or nonpermanent semipermeable membrane.... Nonpermanent membranes or "liquid-surfactant membranes" ... refer to a water-immiscible phase composed of surfactants, "additives", and a hydrocarbon solvent that contain emulsion-size aqueous droplets of various reagents or catalysts.... The general procedure for immobilizing enzymes with liquid-surfactants membranes microcapsules is similar to that used for microencapsulation with permanent membranes. The aqueous enzyme-containing solution is emulsified with a surfactant to form the liquid membrane encapsulated enzyme. Once prepared, the microcapsules are transferred to an aqueous solution to which then can be added the substrate.

French

Domaine(s)
  • Sciences biologiques
CONT

Les microcapsules à membrane liquide [...] présentent l'intérêt de pouvoir être très facilement préparées et de permettre la récupération du matériau enzymatique par simple rupture. Ainsi lorsque l'on soumet à des ultrasons des agrégats obtenus par dispersion de phospholipides dans l'eau, on donne naissance à des sphères closes limitées par une double couche lipidique [...], les liposomes [...], emprisonnant des gouttelettes d'enzymes en solution aqueuse.

OBS

À l'inverse des autres techniques, la pénétration du substrat ne dépend pas alors de la taille des pores de la membrane mais de sa solubilité dans les constituants lipidiques.

Spanish

Save record 2

Record 3 1997-03-03

English

Subject field(s)
  • Canadian General Standards Board (CGSB) Standards
OBS

Standard number: CAN/CGSB-58-M86

French

Domaine(s)
  • Normes de l'Office des normes générales du Canada (ONGC)

Spanish

Save record 3

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