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3.
Dermatology ; 196(4): 467-9, 1998.
Artigo em Inglês | MEDLINE | ID: mdl-9669134

RESUMO

We report two patients with hypomelanosis of Ito, one whose afflictions were limited to the pigmentary skin abnormalities and another with systemic involvement of the neurological and gastrointestinal system. These case reports give support to the importance of establishing hypomelanosis of Ito as occurring with or without systemic involvement.


Assuntos
Hipopigmentação/patologia , Transtornos da Pigmentação/patologia , Adulto , Pré-Escolar , Feminino , Gastroenteropatias/complicações , Gastroenteropatias/patologia , Humanos , Hipopigmentação/complicações , Doenças do Sistema Nervoso/complicações , Doenças do Sistema Nervoso/patologia , Transtornos da Pigmentação/complicações
4.
Inorg Chem ; 35(5): 1305-1309, 1996 Feb 28.
Artigo em Inglês | MEDLINE | ID: mdl-11666324

RESUMO

The structure and stability of VF(5) and the higher chromium fluorides CrF(4), CrF(5), and CrF(6) have been investigated using density functional theory. The local density approximation (LDA) was used to obtain geometries and vibrational frequencies, while nonlocal corrections were added in order to obtain more accurate binding energies. The results obtained for CrF(4) and VF(5) are in good agreement with the available experimental data, indicating the quality of the method used. Both CrF(5) and CrF(6) are found to be stable with respect to Cr-F dissociation. The calculated binding energies are 49.7 and 40.7 kcal/mol, respectively. In agreement with recent ab initio work, the octahedral isomer is found to be the most stable for CrF(6). An activation barries of 16.9 kcal/mol is calculated for pseudorotation to a trigonal prism transition structure. CrF(5) is found to be dynamically Jahn-Teller distorted from D(3h) to C(2v) symmetry.

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