The surface area of the cerebral cortex has increased massively during mammalian evolution and this change has been accompanied by folding of the cortical sheet into gyri. The molecular mechanisms that control cortical size are poorly understood. A recent study suggests that the regulation of cortical size might involve phospholipids, by showing that their addition to cultured embryonic mouse c...

concentrated enzyme extracts with higher specific activities. By performing the assay in the presence of various concentrations of ornithine, we confirmed that AGAT is inhibited by ornithine, as reported previously (7 ). This observation may be of clinical interest in conditions of hyperornithinemia. Decreased brain creatine has been observed in patients affected with gyrate atrophy of the chor...

L-Ornithine is a non-proteinogenic amino acid, abundant in freshwater clams and commercially available as an oral nutritional supplement. L-Ornithine is metabolized by ornithine-δ-aminotransferase. Deficiency of this enzyme causes gyrate atrophy of the choroid and retina, an autosomal recessive hereditary disease characterized by the triad of progressive chorioretinal degeneration, early catara...

Motivated by the analogies between the projective and the almost quaternionic geometries, we first study the generalized planar curves and mappings. We follow, recover, and extend the classical approach, see e.g. [9, 10]. Then we exploit the impact of the general results in the almost quaternionic geometry. In particular we show, that the natural class of H–planar curves coincides with the clas...

purpose : to investigate and compare the causes of blindness in ocular behçet’s disease (bd) in men and women methods : in a retrospective, descriptive investigation from 1976 to 2008, 6,021 bd cases were registered in our bd unit of shariati hospital of tehran university of medical sciences (tums). at the last visit, 187 patients (124 men and 63 women) were blind (vision=1/10 or less) at least...