23 documents found, page 1 of 3
Fiber-reinforced alkali-activated cements from ceramic waste and ladle furnace ...
Gaibor, Norma; Leitão, Dinis; Miranda, Tiago F. S.; Cristelo, Nuno; Fernandes, Lisete; Pereira, E. N. B.; Cunha, Vitor M. C. F.Alkaline-activated cement, as an alternative to conventional portland cement, is being increasingly studied due to its environmental advantages and engineering properties. However, research on the feasibility of using both uncommon precursors and curing at ambient temperature is still limited. This study aims to investigate the potential of ceramic wastes, specifically from brick and tile production and ladle f...
Electrical properties of melt-mixed polypropylene and as-grown carbon nanofiber...
Paleo, Antonio J.; Aribou, Najoia; Nioua, Yassine; Samir, Zineb; Fernandes, Lisete; Moreira, J. Agostinho; Achour, Mohammed E.The morphology, crystallinity, and electrical conductivity (σ′ and σ″) as a function of frequency of polypropylene (PP) melt-extruded with different amounts of as-grown carbon nanofibers (CNFs) from 0 to 1.4 vol. % are examined. The PP/CNF composites present CNF aggregates randomly distributed within the PP and an insulator–conductor transition at CNF contents near 0.9 vol. %. The degree of crystallinity of PP/...
Absence of Gim proteins, but not GimC complex, alters stress-induced transcription
Amorim, Ana Fátima; Pinto, Dora; Kuras, Laurent; Fernandes, LiseteSaccharomyces cerevisiae GimC (mammalian Prefoldin) is a hexameric (Gim1-6) cytoplasmic complex involved in the folding pathway of actin/tubulin. In contrast to a shared role in GimC complex, we show that absence of individual Gim proteins results in distinct stress responses. No concomitant alteration in F-actin integrity was observed. Transcription of stress responsive genes is altered in gim2Δ, gim3Δ and gim...
Alternative regimens for treating prostate cancer using equivalent uniform dose...
Oliveira, Susana; Rosmanets, Yuriy; Teles, Pedro; Fernandes, Lisete; Teixeira, Nuno; Vaz, PedroIntroduction - Conventional radiotherapy treatments are administrated with 2 Gy external beam radiotherapy (EBRT) fractions. It has been postulated that prostate cancer would respond to radiotherapy as a slowly proliferating late-responding normal tissue, benefiting from hypo-fractionated regimens. Highly conformed brachytherapy is a treatment option either alone or combined with EBRT. Purpose - To identify alt...
Assessing the production of jet mix columns using alkali activated waste based ...
Cristelo, Nuno; Miranda, Tiago F. S.; Oliveira, Daniel V.; Rosa, Ivo; Soares, Edgar; Coelho, Paulo; Fernandes, LiseteRecent research has proved the potential of alkaline activated fly-ash for soil stabilisation. However, such studies have not focused on the link between financial, mechanical and environmental aspects of this solution, but only on their absolute mechanical properties. The present paper characterises the mechanical behaviour of a large spectrum of activator-ash-soil combinations used to build jet mixing columns...
Surface engineering of silica nanoparticles for oral insulin delivery: characte...
Andreani, Tatiana; Kiill, Charlene P.; Souza, Ana Luiza R. de; Fangueiro, Joana F.; Fernandes, Lisete; Doktorovová, Slavomira; Santos, Dario L.The present work aimed at studying the interaction between insulin and SiNP surfaced with mucoadhesive polymers (chitosan, sodium alginate or polyethylene glycol) and the evaluation of their biocompatibility with HepG2 and Caco-2 cell lines, which mimic in vivo the target of insulin-loaded nanoparticles upon oral administration. Thus, a systematic physicochemical study of the surface-modified insulin-silica nan...
Dosimetric effect of tissue heterogeneity for 125I prostate implants
Oliveira, Susana Maria; Teixeira, Nuno; Fernandes, Lisete; Teles, Pedro; Vaz, PedroAim - To use Monte Carlo (MC) together with voxel phantoms to analyze the tissue heterogeneity effect in the dose distributions and equivalent uniform dose (EUD) for (125)I prostate implants. Background - Dose distribution calculations in low dose-rate brachytherapy are based on the dose deposition around a single source in a water phantom. This formalism does not take into account tissue heterogeneities, inter...
Tissue composition and density impact on the clinical parameters for 125I prost...
Oliveira, Susana Maria; Teixeira, Nuno; Fernandes, Lisete; Teles, Pedro; Vieira, Guy; Vaz, PedroThe MCNPX code was used to calculate the TG-43U1 recommended parameters in water and prostate tissue in order to quantify the dosimetric impact in 30 patients treated with (125)I prostate implants when replacing the TG-43U1 formalism parameters calculated in water by a prostate-like medium in the planning system (PS) and to evaluate the uncertainties associated with Monte Carlo (MC) calculations. The prostate d...
First isolation of Pseudogymnoascus destructans in bats from Portugal.
Paiva-Cardoso, Maria das Neves; Morinha, Francisco José Guedes; Barros, Paulo Alexandre Rodrigues de; Vale-Gonçalves, Hélia; Fernandes, LiseteThe psychrophilic fungus Pseudogymnoascus destructans (formerly known as Geomyces destructans) is considered the etiological agent of white-nose disease (WND), an emerging disease which affects bats during their hibernation period. This disease is clinically characterized by the growth of a white fungus on muzzle, ears, and wings’ membranes of affected bats. This infection caused the death of several million ba...
Render reinforced with textile threads
Pinto, Jorge; Peixoto, Artur; Vieira, José; Fernandes, Lisete; Morais, José; Cunha, Vitor M. C. F.; Varum, HumbertoFrom a sustainable technical building perspective, this research work aims to investigate the potential of using waste products of the textile industry in building applications. In particular, textile threads as an alternative fiber reinforcement solution for cement based coating mortar. Unfortunately, undesirable and unexpected shrinkage cracking coating mortar is still a relevant concern in the building indus...