Showing papers by "Tunis University published in 1993"
TL;DR: The chromosomal localization of one form of CMT4 will have important implications in clarifying the nosology of this complex group of disorders.
Abstract: Autosomal recessive Charcot-Marie-Tooth (CMT) disease (CMT4) is a complex group of severe childhood motor and sensory neuropathies, characterized by an early age of onset with rapidly progressive distal limb weakness and atrophy. One subgroup designated CMT4 type A (CMT4A) was selected from a series of Tunisian CMT4 families according to the following electrophysiological and pathological criteria: slow motor nerve conduction velocity (MCV), severe hypomyelination upon nerve biopsy with basal lamina onion bulbs and no myelin outfolding. In an attempt to localize the CMT4A locus, we studied four inbred families with 13 affected patients. Significant evidence for linkage was found for several markers from chromosome 8q13-21.1 (D8S279, D8S164, D8S286, D8S84, D8S275 and D8S167). An overall two point peak lod score of z(theta) = 9.19 at theta = 0.00 (95% confidence limit 0.00-0.08) was obtained for D8S164. No evidence of genetic heterogeneity was found. The chromosomal localization of one form of CMT4 will have important implications in clarifying the nosology of this complex group of disorders.
177 citations
TL;DR: In this article, the results obtained from diffraction techniques, which give information on the structure of (00.1) h.c. gold layers embedded in (111) f.p. cobalt thin films, are presented.
16 citations
15 Dec 1993
TL;DR: In this article, three-dimensional potential energy functions (PEFs) for the two components of the electronic ground state X 2 Π state of the N 2 O + radical cation have been calculated using multi-configuration self-consistent field approach.
Abstract: Three-dimensional potential energy functions (PEFs) for the two components of the electronic ground state X 2 Π state of the N 2 O + radical cation have been calculated using multi-configuration self-consistent field approach. The theoretical PEFs and the existing experimental information have been combined to generate empirical PEFs for the beyond Born-Oppenheimer variational calculations of the ro-vibronic energy levels including the couplings of the rotation-vibration, the electron spin and the electronic angular momenta. Band origins ( J = P ) are given for energies up to 4500 cm −1 . The experimentally known vibronic energy levels are reproduced with an accuracy of better than 5 cm −1 for the vibronic states with K ⩽ 2. The anharmonic coupling effects have been investigated.
14 citations
TL;DR: Although it is still in its enfancy, this relation-based model for defining the semantics of concurrent programs shows some advantageous features, which make it worthy of further investigation.
1 citations
TL;DR: In this article, a simple way to calculate the uniaxial strain dependence of the TO(Γ) phonon mode in GaAs, including the envolved relaxations effects, was developed.
Abstract: Using the density-functional theory in the local-density approximation, norm-conserving pseudopotentials, and plane-wave expansions, we have developed a simple way to calculate ab initio the uniaxial strain dependence of the TO(Γ) phonon mode in GaAs, including the envolved relaxations effects. The relaxation response of the system was evaluated from the use of the elasticity theory. Our results confirm the experimental evidence and show a reasonable agreement with the observed data for the frequency splitting of this phonon mode. © 1993 John Wiley & Sons, Inc.
1 citations
TL;DR: In this article, the Claisen rearrangement of allyl F-alkylated vinyl ethers was used for the first time to obtain γ,Δ ethylenic perfluoroalkyl ketones.
Abstract: γ,Δ ethylenic perfluoroalkyl ketones, described for the first time, were prepared through the Claisen rearrangement of allyl F-alkylated vinyl ethers.