RESUMO
Using layered double hydroxides as a support, both the palladium catalyst and the cobalt co-catalyst are heterogenised and proven to form an acceptable catalytic system for the heterogeneous oxidative carbonylation of phenol to diphenyl carbonate (DPC).
RESUMO
Intradural spinal teratoma is a rare tumor that can be associated with dysraphic defects. Although the origin of these tumors is traditionally thought to be secondary to primordial germ cells misplaced early in embryogenesis, the pathogenesis of intraspinal teratoma remains unclear. The authors present a series of patients in whom an intradural teratoma arose at the same site as a developmental spinal cord abnormality, including a split cord malformation, myelomeningocele, and lipomyelomeningocele. It is postulated that these lesions were the result of a dysembryogenic mechanism and were not neoplastic.
