Browsing by Author "Rocha, S."
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- 13C solid-state nuclear magnetic resonance and Fourier transform infrared studies of the thermal decomposition of corkPublication . Neto, C. Pascoal; Rocha, J.; Gil, A.; Cordeiro, N.; Esculcas, A.P.; Rocha, S.; Delgadillo, I.; De Jesus, J.D.Pedrosa; Correia, A.J.FerrerThe thermal decomposition of cork has been studied by Fourier transform infrared (FTIR) spectroscopy and 13C solid-state nuclear magnetic resonance (NMR) spectroscopy with cross-polarization and magic-angle spinning (CP-MAS), high-power ‘H decoupling (HPDEC) and cross-polarization depolarization-polarization (CPDP). Waxes and other soluble components of cork begin to decompose at ca. 150°C. This is accompanied by partial decomposi tion of suberin, probably initiated at the points of attachment to the cell wall. The carbohydrates begin to decompose at ca. 200°C. The decomposition of lignin begins at 250-3OO”C, while suberin undergoes further degradation. Significant amounts of coke are formed in the process. At 400°C cork has been transformed into coke with traces of partially decomposed suberin. The thermal decomposition of cork is dependent on the calcination time, particularly in the 200-350°C range.
- Ultrastructural and molecular characterization of a microsporidian infectingSerranus atricauda(Teleostei, Serranidae) in the Madeira ArchipelagoPublication . Casal, G.; Rocha, S.; Costa, Graça; Al-Quraishy, S.; Azevedo, C.