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POLYMERIC GEL [2 records]

Record 1 2011-01-12

English

Subject field(s)
  • Biological Sciences
CONT

The first experiments on covalent binding of a variety of proteins including enzymes as well as antigens to chemically well defined water-insoluble polymeric supports were limited to the commercial polymers available at the time--derivatized celluloses and styrene polymers.... These first steps were soon followed by other methods of coupling proteins to polymers.... The preparation of a complementary polymeric support is based on modifying the enzyme by an analogue of the monomer and then copolymerizing the resulting preparation with the monomer. This gives an enzyme chemically incorporated into the three-dimensional lattice of the polymer gel, the points of the enzyme-support binding being the centers of premodification of the enzyme molecule.

French

Domaine(s)
  • Sciences biologiques
CONT

L'aspartame [...] est constitué par deux acides aminés, la L-phénylalanine et le L-acide aspartique. Sa synthèse est très difficile à réaliser par voie chimique : seul un procédé complexe permet de préparer de la L-phénylalanine par dédoublement d'un mélange racémique de phénylalanine D et L. En revanche, la thermolysine immobilisée sur un support polymère réalise facilement cette synthèse à partir de l'acide L-aspartique et d'un mélange racémique de phénylalanine L et D où elle sélectionne exclusivement le dérivé L.

Spanish

Save record 1

Record 2 1986-08-06

English

Subject field(s)
  • Silviculture
  • Chemical Elements and Compounds
CONT

Pure culture inocula of ectomycorrhizal fungi are usually produced on a vermiculate peat mixture. They can also be prepared by cultivating the fungus in a fermentor and entrapping it in a polymeric gel...

French

Domaine(s)
  • Sylviculture
  • Éléments et composés chimiques
OBS

gel : Partie insoluble de certains polymères ... On obtient des gels à partir de chaînes polymériques flexibles attachées les unes aux autres en quelques points et formant un réseau tridimensionnel. Ce réseau est gonflé par un solvant.

Spanish

Save record 2

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