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Bark-based biorefineries: anatomical and chemical characterization of the bark ...
Şen, Ali Umut; Simões, Rita; Yücedağ, Cengiz; Quilhó, Teresa; Sousa, Vicelina; Miranda, Isabel M.; Fernandes, Ângela; Pereira, HelenaThe detailed anatomical and chemical features of the bark from endemic Quercus vulcanica in Turkey are reported here for the first time and discussed in the perspective of integration into a bark-based biorefinery system. The bark of Q. vulcanica trees was collected and studied through observations using light and scanning electron microscopy, wet-chemical analysis, inorganic elemental and FTIR analyses, GC-MS ...
A new construction of an MDS convolutional code of rate 1/2
Abreu, Zita; Pinto, Maria Raquel; Simões, RitaMaximum distance separable convolutional codes are characterized by the property that the free distance reaches the generalized Singleton bound, which makes them optimal for error correction. However, the existing constructions of such codes are available over fields of large size. In this paper, we present the unique construction of MDS convolutional codes of rate 1/2 and degree 5 over the field 11.
Insights into cork weathering regarding colour, chemical and cellular changes i...
Miranda, Isabel; Lourenço, Ana; Simões, Rita; Athayde, João; Pereira, HelenaA comprehensive analysis of outdoor weathering and soil burial of cork during 1-year experi- ments was carried out with measurements of CIELAB color parameters, cellular observa- tions by scanning electron microscopy, and surface chemical features analysed by ATR- FTIR and wet chemical analysis. Cork applied in outdoor conditions above and below ground retained its physical structure and integrity without signs...
Biochemical characterization and fuel properties of endemic taurus flowering as...
Şen, Ali Umut; Simões, Rita; Yücedağ, Cengiz; Miranda, Isabel M.; Fernandes, Ângela; Pereira, HelenaTaurus flowering ash (Fraxinus ornus subsp. cilicica) is an endemic tree species in Turkey. The bark of the species was characterized for summative chemical composition, the monomeric composition of polysaccharides, phenolic content, in vitro and ex vivo antioxidant properties of hydrophilic extracts, the composition of lipophilic extractives and suberin, and thermal degradation. The bark has an elevated ash co...
Cuticular Waxes and Cutin in Terminalia catappa Leaves from the Equatorial São ...
Pereira, Helena; Simões, Rita; Miranda, IsabelThis study presents for the first time an analysis of the content and chemical composition of the cuticular waxes and cutin in the leaves of the widespread and important tropical species Terminalia catappa. The leaves were collected in the equatorial Atlantic islands of São Tomé and Príncipe, in the Gulf of Guinea. The epicuticular and intracuticular waxes were determined via dichloromethane extraction and thei...
Variation in leaf cutin content and chemical composition along one annual cycle...
Simões, Rita; Sousa, Isabel; Pereira, HelenaPlant leaves have one important protection barrier made up by a cuticle that covers their external surface and builds up a continuous extracellular, mostly hydrophobic, membrane on the epidermis that provides protection from biotic or abiotic stresses, namely from climatic harsh conditions, e.g., by limiting water loss and in heat insulation [1,2]. The cuticle includes a polymeric cutin matrix and cuticular wax...
Biochemical Characterization and Fuel Properties of Endemic Taurus Flowering As...
Sen, Ali Umut; Simões, Rita; Yüceda˘, Cengiz; Miranda, Isabel; Fernandes, Ângela; Pereira, HelenaTaurus flowering ash (Fraxinus ornus subsp. cilicica) is an endemic tree species in Turkey. The bark of the species was characterized for summative chemical composition, the monomeric composition of polysaccharides, phenolic content, in vitro and ex vivo antioxidant properties of hydrophilic extracts, the composition of lipophilic extractives and suberin, and thermal degradation. The bark has an elevated ash co...
Optimization of autohydrolysis of olive pomaces to obtain bioactive oligosaccha...
Freitas, Laura; Simões, Rita; Miranda, Isabel; Peres, Maria de Fátima.; Dias, Suzana FerreiraThe valorisation of agro-industrial residues presents a challenge in obtaining economically sustainable and environmentally friendly industrial processes. Olive pomace is a by-product generated in large quantities, from olive oil extraction. This residue mostly consists of lignocellulosic materials. The aim of this study was to evaluate the potential use of extracted olive pomaces (EOP) obtained from olives wit...
The Influence of Solvent and Extraction Time on Yield and Chemical Selectivity ...
Simões, Rita; Miranda, Isabel; Pereira, H.The cuticular lipid compounds, usually named cuticular waxes, present in the cuticular layering of Quercus suber adult leaves were extracted with solvents of different polarities (n-hexane, dichloromethane and acetone) and analysed by GC–MS. Q. suber leaves have a substantial cuticular wax layer (2.8% of leaf mass and 239 g/cm2), composed predominantly by terpenes (43–63% of all compounds), followed by aliphati...
Phytochemical Composition of Extractives in the Inner Cork Layer of Cork Oaks w...
Simões, Rita; Branco, Manuela; Nogueira, Carla; Carvalho, Carolina; Santos-Silva, Conceição; Ferreira-Dias, S.; Miranda, Isabel; Pereira, HelenaThe beetle Coraebus undatus, during its larval stage feeds, and excavates galleries on the cork-generating layer of Quercus suber L. trees, seriously affecting the cork quality with significant economic losses for the cork industry. This work compared the composition of the extracts present in the innermost cork layers (the belly) of cork planks from Q. suber trees with low and moderate C. undatus attack in one...