Biomedical subjects

J Maquet

Publications and source records attributed to J Maquet.

3 recordsLinked to original sources

PubMed2005

Application of the MAS-J-HMQC experiment to a new pair of nuclei {29Si,31P}: Si5O(PO4)6 and SiP2O7 polymorphs.

We report the results of the two-dimensional MAS-J-HMQC experiment providing scalar correlations between 29Si and 31P nuclei in solid state NMR, and we give the first evaluation of the 2JSi-O-P coupling constants (approximately 15 Hz) for a crystalline silicophosphate phase Si5O(PO4)6. The experiment is applied to the characterization of complex mixtures of SiP2O7 phases, through editing of 31P spin pairs by the heteronuclear 2JP-O-Si interaction.

Journal Article↗

PubMed2000

Modeling maps by using rational functions

Rational functions are not very useful for obtaining global differential models because they involve poles that may eject the trajectory to infinity. In contrast, it is here shown that they allow one to significantly improve the quality of models for maps. In such a case, the presence of poles does not involve any numerical difficulty when the models are iterated. The models then take advantage of the ability of rational functions to capture complicated structures that may be generated by maps. The method is applied to experimental data from copper electrodissolution.

Journal Article↗

PubMed1991

[Cerebellar cavernous angioma, cervical dystonia and crossed cortical diaschisis].

On four occasions since 1978, this 53 year-old woman presented with a right hemicorporal hypotonia, symptomatic of a hemispheric cerebellar syndrome. In 1981, she experienced the progressive development of a cervical dystonia. CT scan and RM scan showed a cavernous angioma in the right cerebellar hemisphere. The 18F-2-fluoro-2-deoxy-glucose PET scan revealed a right cerebellar and a contralateral cortical and striatal hypometabolism. This crossed cerebello-cortical diaschisis can be interpreted as a functional interruption of the cerebello-cerebral pathways. This case raises the question of the role played by a cerebellar lesion in the development of a focal dystonia.

Cerebellar Neoplasms↗