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Low temperature polymorphism in 3-amino-1-propanol
Cacela, C.; Baudot, A.; Duarte, M. L.; Matos-Beja, A. M.; Silva, M. Ramos; Paixão, J. A.; Fausto, R.3-Amino-1-propanol (3AP) was investigated by differential scanning calorimetry, and low temperature powder X-ray diffraction and Raman spectroscopy. Within the range of temperatures studied (-150-25 °C), 3AP was found to be able to crystallize in two monotropic polymorphs. Fast cooling rates produce an amorphous state that, on heating, crystallizes into the metastable polymorph. At higher temperatures, this met...
Carcinoma espinho-celular do colo do útero tipo linfoepitelioma-like
Pires, MA; Andrade, MJ; Guerra, C; Silva, T; Oliveira, CF; Matos-Beja, ALymphoepithelioma-like carcinomas of the cervix uteri are very rare. They are poorly differentiated squamous cell carcinomas with intense stromal lymphocytic infiltration. These histologic features are similar to nasopharyngeal lymphoepithelioma and may have a better prognosis than other tumors of the cervix. A lymphoepithelioma-like lesion of the cervix uteri is described in a 33-year-old Caucasian woman who h...
Molecular structure and charge density analysis of p-methoxybenzoic acid (anisi...
Fausto, R.; Matos-Beja, A.; Paixão, J.A.A concerted X-ray and ab initio SCF-MO study of the structure and charge density of p-methoxybenzoic acid (anisic acid) is reported. An extensive X-ray data set (7401 reflections) was measured on a single crystal using Mo Kα radiation and the structure refined with 2121 unique reflections, leading to a final R(F)-factor of 0.047 calculated for reflections with I>2σ. The molecular geometry of crystalline anisic ...
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