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Forty-two patients have been surgically treated for medically uncontrollable epilepsy, using the Talairach and Bancaud methodology. The mean age of the patients was 19 years (range 6-54 years). The location of the epileptogenic zone was:frontal in 18 patients, temporal in 14, temporo-parieto-occipital junction in 4, parietal in 4 and occipital in 2. The… (More)
The authors present 4 patients with medically uncontrollable epilepsy of tumoural aetiology (grade I-II gliomas). In two of them, CT scan showed probable neoplastic lesions, located deeply in the left frontal and right temporal lobes respectively, reflected in the SEG studies only in the second case. The other two were patients with left frontal gliomas in… (More)
Sodium and pH responsive Hydrogel Formation by the Supramolecular System: Calixpyrrole derivative/Tetramethyl Ammonium.
An L-proline based supramolecular hydrogel is used as an efficient heterogeneous organocatalyst for the direct aldol reaction with high stereoselectivity (up to 90% ee) and recyclability (up to 3 runs). The reversible nature of this self-assembled supramolecular system allows for easy recovery and regeneration of the catalyst.
We examine the self-assembly of a peptide A6H comprising a hexa-alanine sequence A6 with a histidine (H) "head group", which chelates Zn(2+) cations. We study the self-assembly of A6H and binding of Zn(2+) ions in ZnCl2 solutions, under acidic and neutral conditions. A6H self-assembles into nanotapes held together by a β-sheet structure in acidic aqueous… (More)
A low molecular weight hydrogelator with a covalently appended imidazole moiety is reported. Capable of percolating water in the pH range of 6 to 8, it proves to be an efficient catalyst upon self-assembly, showing Michaelis-Menten type kinetics. Activities at different pH values correlated with dramatic structural changes were observed. It can hydrolyse… (More)
The formation of self-assembled fibrillar networks by low molecular weight peptidomimetics containing a Pro-Val moiety is reported; insight into the aggregation mechanism is provided revealing that it is associated to an unfolding process and that a fibrillar network formed under kinetic control can self-correct into a thermodynamically stable one.