MersV1, Main, Exploration, bibRecord, 005067

Clays as possible catalysts for peptide formation in the prebiotic era.

Identifieur interne : 005067 ( Main/Exploration ); précédent : 005066; suivant : 005068

Clays as possible catalysts for peptide formation in the prebiotic era.

Auteurs : M. Paecht-Horowitz

Source :

Origins of life [ 0302-1688 ] ; 1976.

RBID : pubmed:1023136

Descripteurs français

KwdFr :
- AMP, Analyse spectrale, Catalyse, Eau, Peptides, Relation structure-activité, Sol.
MESH :
- AMP, Analyse spectrale, Catalyse, Eau, Peptides, Relation structure-activité, Sol.

English descriptors

KwdEn :
- Adenosine Monophosphate, Catalysis, Peptides, Soil, Spectrum Analysis, Structure-Activity Relationship, Water.
MESH :
- chemical : Adenosine Monophosphate, Peptides, Soil, Water.
- Catalysis, Spectrum Analysis, Structure-Activity Relationship.

Abstract

From the point of view of prebiotic synthesis, clays might have performed functions of concentration, catalysis, and protection of molecules. The degree of polymerization obtained when amino acid adenylates are added to montmorillonite suspensions in water, are much iigher than those obtained by polymerization in the absence of such a clay. In addition, they are of a discrete spectrum, usually multiplies of 6 or 7, and reach values of up to 40 mers. In the absence of clay a continuous spectrum of degrees of polymerization is obtained, and usually up to 4-6 mers only. Copolymerization in the absence of clays yields mostly random copolymers in their presence mostly block copolymers are obtained. Optical density measurements show that after adsorption has taken place on the clay, stacking of its layers occurs. Polymerization starts only after these stacked layers have been formed. The distance between the layers - as measured by X-rays - increase during polymerization, probably because the resulting polymers settle in their interspace, while the adsorption site of the active monomers is at the edges of the clay.

DOI: 10.1007/bf00927932
PubMed: 1023136

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en">From the point of view of prebiotic synthesis, clays might have performed functions of concentration, catalysis, and protection of molecules. The degree of polymerization obtained when amino acid adenylates are added to montmorillonite suspensions in water, are much iigher than those obtained by polymerization in the absence of such a clay. In addition, they are of a discrete spectrum, usually multiplies of 6 or 7, and reach values of up to 40 mers. In the absence of clay a continuous spectrum of degrees of polymerization is obtained, and usually up to 4-6 mers only. Copolymerization in the absence of clays yields mostly random copolymers in their presence mostly block copolymers are obtained. Optical density measurements show that after adsorption has taken place on the clay, stacking of its layers occurs. Polymerization starts only after these stacked layers have been formed. The distance between the layers - as measured by X-rays - increase during polymerization, probably because the resulting polymers settle in their interspace, while the adsorption site of the active monomers is at the edges of the clay.</div>
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Serveur d'exploration MERS

Clays as possible catalysts for peptide formation in the prebiotic era.

Clays as possible catalysts for peptide formation in the prebiotic era.

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki

	Serveur d'exploration MERS
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