Showing papers by "Serge Pérez published in 1985"
TL;DR: In this paper, the crystal structure of methyl-α-maltotrioside tetrahydrate C 16 H 34 O 16, 4H 2 O has been established by direct methods from 2269 independent reflections and refined to a final R value of 0.054.
44 citations
TL;DR: A unified representation of helical parameters (n,h) based on a polar mapping is proposed and its application to the case of polysaccharides allows a straightforward comparison of all secondary structures displayed by this class of biopolymers in the solid state.
Abstract: A unified representation of helical parameters (n,h) based on a polar mapping is proposed. Its application to the case of polysaccharides allows a straightforward comparison of all secondary structures displayed by this class of biopolymers in the solid state. Based on the concept that a disordered state of a polymer may be described by a succession of local helical parameters, the application of this unified representation has been extended to the simulation of chain behavior in solution.
15 citations
TL;DR: The 13C nmr spectra of solids acquired using the Cross Polarization/Magic Angle Spinning (CP/MAS) technique are very sensitive to the detailed nature of crystalline packing as discussed by the authors.
Abstract: The 13C nmr spectra of solids, acquired using the Cross Polarization/Magic Angle Spinning (CP/MAS) technique, are very sensitive to the detailed nature of crystalline packing. These effects are illustrated in the CP/MAS spectra of the α and β anomers of methyl-D-xylopyranoside. In the spectrum of the α anomer, which crystallizes with two molecules per unit cell, individual spectra can be resolved for the two molecules in the asymmetric unit of this crystal.
13 citations