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Chemical ecology of echinoderms : impact of environment and diet in metabolomic...
Pereira, David M.; Andrade, Paula B.; Pires, R. A.; Reis, R. L.The phylum Echinodermata constitutes a successful and widespread group comprising Asteroidea, Ophiuroidea, Echinoidea, Holothuroidea and Crinodeia. Nowadays, marine organisms are being given a lot of attention in drug discovery pipelines. In these studies, sponges and nudibranchs are frequently addressed, however an increasing number of works focus their attention in echinoderms. Given the fact that many of the...
Tailor made degradable ureteral stents from natural origin polysaccharides
Barros, Alexandre A.; Duarte, Ana Rita C.; Pires, R. A.; Lima, Estêvão Augusto Rodrigues de; Mano, J. F.; Reis, R. L.A urinary stent is defined as a thin tube, which is inserted in the ureter to prevent or treat the obstruction of urine flow from the kidney. Silicone, latex, polyvinylchloride and polyurethanes are the most widely used materials for the preparation of stents. Nonetheless, severe clinical complications may result from the use of these materials such as fracture, encrustation and infection. In some of the cases,...
Immobilization of bioactive factor-loaded liposomes at the surface of electrosp...
Monteiro, Nelson; Martins, Albino; Pires, R. A.; Faria, Susana, 1972-; Fonseca, Nuno A.; Moreira, João N.; Reis, R. L.; Neves, N. M.Publicado em "Journal of Tissue Engineering and Regenerative Medicine", vol. 7, supp. 1 (2013) ; The ability to manipulate and control the surface properties is of crucial importance in the designing of scaffolds for Tissue Engineering (TE) and Regenerative Medicine. Electrospun nanofibers (NFM), due to their morphology and fibrous structure have received much attention as potential biomedical devices, TE scaf...
Sulfonic groups induce formation of filopodia in mesenchymal stem cells
Costa, Diana Soares da; Pires, R. A.; Frias, A. M.; Reis, R. L.; Pashkuleva, I.Glycosaminoglycans (GAGs) are an integral part of the extracellular matrix and glycocalix, i.e. the closest cellular environment. They are abundant in –OH groups and their bioactivity is also associated with the presence of negatively charged –SO3H functionalities. Therefore, we have investigated and discussed the influence of these functional units on mesenchymal stem cells (MSCs) behaviour using single compon...
Improvement on the mechanical properties of cork composites using suberin as co...
Fernandes, E. M.; Aroso, Ivo; Pires, R. A.; Correlo, V. M.; Pitkänen, P.; Koskimies, S.; Mano, J. F.; Reis, R. L.New functionalized composite structures were prepared using low-density polyethylene (LDPE), cork powder and different suberins extracted from cork and birch outer bark as coupling agents to promote interfacial adhesion. The compounding was performed under reactive extrusion and samples processed by compression moulding. The morphology of the functionalized composites showed good adhesion between cork and the p...
Surface properties of extracts from cork black condensate
Pires, R. A.; Mano, J. F.; Reis, R. L.The insulation corkboard production generates black condensate (BC), a paste-like solid waste. It is hydrophobic and has the potential to be used as protective coating. To evaluate this potential, coatings were prepared from BC extracts and their surface behavior was evaluated by contact angle (CA) measurements. The CA dynamics were recorded as a function of time; advancing CAs were also registered; the approac...
Structural and spatially-resolved studies on the hardening of a commercial resi...
Pires, R. A.; Fernandez, Christian; Nunes, Teresa G.A commercial photopolymerizable resinmodified glass-ionomer (Fuji II LC) was studied using a variety of nuclear magnetic resonance (NMR) techniques. H and F stray-field imaging (STRAFI) enabled to follow the acid–base reaction kinetics in self-cured (SC) samples. Gelation and maturation processes with 25 min and 40 h average time constants, respectively, were distinguished. In self- & photo-cured (SPC) samples,...
31P nuclear magnetic resonance and X-ray diffraction study of Na-Sr-phosphate g...
Pires, R. A.; Abrahams, I.; Nunes, Teresa G.; Hawkes, G. E.A set of Na-Sr-phosphate glass and glass-ceramic samples, with general formula xSrO:(0.55-x)Na2O:0.45P2O5, were prepared and analysed by solid state 31P nuclear magnetic resonance spectroscopy and X-ray powder diffraction. The results show the presence of Q1 and Q2 phosphate species in all samples. At low concentrations of Sr2+ (x £ 0.20) the strontium is preferentially incorporated in Sr2+-Q1 crystalline phase...
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