Browsing by Author "Silva, Ana"
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- Calcific uraemic arteriolopathy - A mini-reviewPublication . Mendes, Filipa; Rocha, Sofia Couto; Agapii, Rodica; Silva, Ana; Fragoso, Andr?; Jerónimo, Teresa; Pimentel, Ana; Neves, Pedro LCalcific Uraemic Arteriolopathy (CUA) or calciphylaxis, is a thrombotic disorder of skin and subcutaneous tissue which typically presents with painful purpuric nodules that may progress to necrotic ulcers, and is a severe, life-threatening condition. CUA is an uncommon clinical entity that affects mostly haemodialysis (HD) patients. Although the process of vascular calcification was initially thought to be the result of a passive deposition of calcium-phosphate crystals, current knowledge suggests a distinct mechanism, including cellular activity with differentiation of vascular smooth muscle cells (VSMCs) into chondrocyte as well as osteoblast-like cellular phenotypes and deficiencies in calcification inhibitors. Although multiple studies suggest a potential relationship between warfarin and CUA, larger prospective studies are needed in order to better evaluate this association, and randomised controlled trials are needed to assess the benefit of distinct interventions in this setting. In this article the topic of CUA is reviewed based on a clinical case of a 65-year-old man undergoing haemodialysis, who underwent an aortic valve replacement one year earlier, receiving a mechanical heart valve, and who has been under warfarin therapy since then
- Calcium/magnesium ratio in patients with diabetes and chronic kidney disease: a risk factor for cardiovascular diseasePublication . Borges, Henrique; Afonso, Rita; Marques, Roberto Calças; Jerónimo, Teresa; Silva, AnaChronic Kidney Disease (CKD) and Diabetes Mellitus (DM) are significant risk factors for Cardiovascular (CV) Disease. Patients with CKD and/or DM exhibit higher incidence and prevalence of CV events compared to the general population. Hypomagnesemia and elevated calcium-magnesium (Ca:Mg) ratios have been identified as independent risk factors for CV-related deaths. The aim of this study is to determine the relationship between Ca:Mg and the prognosis of CV disease in patients with CKD and DM.
- Do saber ao bem estar: uma nova bioexperiência RomanaPublication . Reis, Emanuel; Colaço, Ana; Rodrigues, Miguel; Dias, Filipe; Santos, Ana; Silva, Ana; Francisco, Maria Luisa; Garcia, Cristina; Brigas, Amadeu; Azambuja, Sónia Talhé; Fernandes, Paulo; Silva, Ana Paula; Flores, Ruben; Tomás, André; Marcelo, Pedro; Tomás, André; Veiga-Pires, C.A iniciativa “Do saber ao bem estar: uma nova bio-experiência romana" é uma atividade desenvolvida no âmbito do programa DiVaM e enquadrada nas Jornadas Europeias do Património 2016 e dá continuidade à atividade já realizada no ano anterior, intitulada “Do saber ao sabor: uma bio-experiência romana.” A Villa de Milreu é um exemplo do modelo de ocupação romana da região da Iberia, centrada na exploração dos recursos agrícolas, marinhos e na produção de bens alimentares, que eram exportados por via marítima para os portos do Império. Com esta “nova bio-experiência” pretende-se proporcionar aos participantes a possibilidade de vivenciar a cultura e costumes do Algarve Romano à luz de um enquadramento científico, mas informal e lúdico, segundo uma abordagem alternativa à que foi explorada na edição do ano passado, focando este ano nas plantas.
- Environmental factors impacting the abundance and distribution of amphipods in intertidal rock poolsPublication . Carvalho, Jéssica; Mendonça, Vanessa; Vinagre, Catarina; Silva, AnaIntertidal rock pools are considered critical habitats along coastal shores. Amphipods play an important role in intertidal rock pool ecosystems, as food resources for higher trophic levels and sometimes by enriching nutrients through grazing. However, the environmental factors driving their rockpool occupation remain largely unknown. We aimed to examine the importance of the large-scale wave action variation and meso-scale shore variation on the abundance and diversity of rockpool amphipods. A total of 32 intertidal rock pools on four Portuguese shores were studied during the summer spring tide of 2015. We applied multivariate analysis to evaluate the potential impact of wave action (sheltered versus wave exposed shores), physical pool structure (length, width, and depth), and relationships within the pool community on the abundance and diversity of amphipods. Wave exposure significantly influenced amphipod abundance and diversity, and some substrata and biodiversity features of the pool were important in explaining the amphipod abundance. The percentage and composition of coverage and physical features of the rock pools had no significant effect on amphipod abundance and diversity. We showed that the amphipod rockpool community displayed a clear positive response of biodiversity and abundance to the extrinsic factor wave action, and a varied and complex response to within-rockpool biotic variables. In addition, we recorded the presence of the invasive Ampithoe valida for the first time on rocky shores of Portugal. Further investigation into the influence that wave action has on associated pool biota (i.e., dislodgment or deposition of species) could give additional insight into the role of the biotic community in the regulation of amphipod populations within intertidal rock pools
- Morphodynamics of fetch-limited beaches in contrasting environmentsPublication . Freire, Paula; Ferreira, Óscar; Taborda, Rui; Oliveira, Filipa; Carrasco, Ana Rita; Silva, Ana; Vargas, Catarina; Capitão, Rui; Fortes, Conceição Juana; Braga Coli, Alexandre; Santos, JoãoSandy beaches can be found in fetch-limited environments that are protected from ocean generated waves, as estuaries, lagoons, and backbarriers, and where fetch characteristics allow local wind-generated waves to develop and maintain a beach. The morphodynamics of these low-energy beaches present a peculiar behaviour and general open-ocean models are inappropriate for their study.
- Patterns of rock pool molluscs in differing shore exposuresPublication . Gonçalves, Inês; Vinagre, Catarina; Silva, AnaRock pools are understudied systems of extreme importance due to their proven vulnerability to climate change. Rock pool molluscs play essential ecological roles therein, directly by acting both as prey and predator and, indirectly by influencing the macroalgal canopy/vegetation topography via grazing. However, the environmental factors driving their rock pool occupation remain largely unknown. Our study is one of the few to focus on community patterns in rock pool molluscs, particularly at a large scale between shores of differing exposure to wave action, being the first focused assessment of rock pool molluscs in Portugal. Overall, 32 intertidal rock pools on four rocky shores were studied during the summer spring tide of 2015. We used multivariate analysis to evaluate the potential impact of sheltered versus exposed wave action, physical pool structure (length, width, and depth), and relationships within the pool community on the abundance and diversity of molluscs. Wave exposure significantly influenced mollusc abundance and diversity. The majority of the 37 different taxa identified were grazing gastropods (62.2%), followed by bivalves (27.0%) and chitons (10.8%). We suggest that mollusc taxa may have preferences for particular rock pool habitats depending on the type of algae present rather than pool size. We also suggest that species-specific mollusc presence in rock pools can be related to their shell size, aperture, and foot size due to corresponding variation in musculature needed to hold the snail to the substrate in hydrodynamic conditions. Further investigation would benefit from disentangling the potential role of algal pool coverage as a refuge for molluscs.
- Unknown facts of the biology of Polybius henslowii - Effect of gender on claw morphology and dietPublication . Cereja, Rui; Vinagre, Catarina; Silva, AnaPolybius henslowii is known for both its unusual swimming behaviour and for forming large shoals during its pelagic phase. Although being a common species, many aspects of its biology remain unknown. In this work, P. henslowif s sexual dimorphism was examined in both dietary composition and morphologies of carapace and claw. Males were generally larger than females both on carapace and claw sizes. Claw morphology differed between males and females. Diet was similar between genders. Hence, we suggest that the sexual dimorphism in claw morphology results from gender-specific behaviours instead of diet. The most common dietary items were sand (51.2%), squid (34.1%) and crustaceans (26.8%). The same items were also the most important in volume, but with squids being more important than sand. The diet composition of P. henslowii was consistent with previous studies but also presenting sediment as an important item.