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169. Foreword

Author

Guillot, J., primary, Guyot, A., additional, and Pichot, C., additional

Published
1995
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178. Dispersions filmogènes de latex copolymères modèles. Relations synthèse-structure-propriétés

Author

Guyot, A, primary, Cansell, F, additional, Cavaille, JY, additional, Chevalier, Y, additional, Dobler, F, additional, Graillat, C, additional, Guillot, J, additional, Henry, F, additional, Hidalgo, M, additional, Holl, Y, additional, Lambla, M, additional, Mura, JL, additional, Perez, J, additional, Pichot, C, additional, Pith, T, additional, Riess, G, additional, and Rios, L, additional

Published
1992
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180. Variation of selfing rate and inbreeding depression among individuals and across generations within an admixed Cedrus population.

Author

Ferriol, M., Pichot, C., and Lefèvre, F.

Subjects
*INBREEDING, *CEDRUS, *CHLOROPLAST DNA, *PLANT growth, *SEEDLINGS, *SELF-pollination
Abstract

We investigated the variation and short-term evolution of the selfing rate and inbreeding depression (ID) across three generations within a cedar forest that was established from admixture ca 1860. The mean selfing rate was 9.5%, ranging from 0 to 48% among 20 seed trees (estimated from paternally inherited chloroplast DNA). We computed the probability of selfing for each seed and we investigated ID by comparing selfed and outcrossed seeds within progenies, thus avoiding maternal effects. In all progenies, the germination rate was high (88-100%) and seedling mortality was low (0-12%). The germination dynamics differed significantly between selfed and outcrossed seeds within progenies in the founder gene pool but not in the following generations. This transient effect of selfing could be attributed to epistatic interactions in the original admixture. Regarding the seedling growth traits, the ID was low but significant: 8 and 6% for height and diameter growth, respectively. These rates did not vary among generations, suggesting minor gene effects. At this early stage, outcrossed seedlings outcompeted their selfed relatives, but not necessarily other selfed seedlings from other progenies. Thus, purging these slightly deleterious genes may only occur through within-family selection. Processes that maintain a high level of genetic diversity for fitness-related traits among progenies also reduce the efficiency of purging this part of the genetic load. [ABSTRACT FROM AUTHOR]

Published
2011
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181. Ordering of latex particles during film formation.

Author

Kilian, H. -G., Lagaly, G., Zulauf, M., Terech, P., Joanicot, M., Wong, K., Maquet, J., Chevalier, Y., Pichot, C., Graillat, C., Lindner, P., Rios, L., and Cabane, B.

Abstract

Small angle neutron scattering and electron microscopy are used to investigate the ordering of soft latex particles which have been dispersed in water and then brought into contact through evaporation of the solvent. We observe a succession of metastable states where the particles are kept separated by their hydrophilic surface layers: colloidal liquid (short range order only) to colloidal crystal (long range order) to foam (dense packing of polyhedral cells with latex interior and hydrophilic walls). At each stage the structure may collapse into a homogeneous latex phase through coalescence of the particles and expulsion of the hydrophilic material. [ABSTRACT FROM AUTHOR]

Published
1990
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200. RECONSTRUCTION OF COMPLEX AND MULTIPLE SHAPE OBJECT CONTOURS USING A LEVEL SET METHOD.

Author

Ferray&eacut;, R., Dauvignac, J.-Y., and Pichot, C.

Subjects
ELECTROMAGNETIC wave scattering, IMAGING systems, CRYSTAL growth, ELECTRICAL harmonics, FLUID dynamics
Abstract

A very accurate inverse scattering method for reconstructing the contours of perfectly conducting cylinders of arbitrary cross-section illuminated by electromagnetic waves under TM polarization with time-harmonic dependence is presented. No assumption is made on the shapes of the contours nor on their number. Inversion strategy consists in computing a special deformation velocity, defined on the contours of the objects, and allowing to decrease a cost function at each interation. Level set methods, used in as diverse fields as fluid dynamics, image processing and crystal growth, are used to perform the evolution of the contours. These methods allow to handle automatically topological changes by using a Eulerian point of view built on a level set representation of the contours. Hence, several objects can be retrieved from one single initial contour. Moreover, contours regularization is easily performed by adding a curvature term to the velocity. The inverse scattering method is based on a very accurate forward scattering algorithm characterized by the use of well-behaved pseudo-currents which are developed in Fourier series along the contours. The frequency hopping technique turns out to play a key role in the inversion process. The method is proved to be flexible, allowing to reconstruct accurately complex and multiple shape contours from one single initial guess. The deformation velocity is even able to retrieve very sharp corners and is quite robust with respect to high noise levels. [ABSTRACT FROM AUTHOR]

Published
2003

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