22 documents found, page 1 of 3
Quality Control Protocol of Individual Radiological Protection Equipment in a H...
Cardoso, Isabel; Freire, Luís; Ribeiro, Maria MargaridaIntroduction: In Radiology, with the increasing number of diagnostic procedures using Ionizing Radiation, it is imperative to monitor Personal Radiation Protection Equipment to ensure safe working environments for professionals. Objectives: To develop a Quality Control protocol for Personal Radiation Protection Equipment and to create a Good Practice Guide. To assess the attenuation percentage of the equipment....
Application of abbreviated protocols in the study of Prostate Carcinoma by Magn...
Abreu, Vanessa Alexandra Vicente de; Oliveira, Vítor Jesus de; Ribeiro, Maria MargaridaProstate cancer is the second tumor in incidence and mortality among male malignant neoplasms. For adequate therapeutic programming, it is essential to characterize and distinguish between tumors confined to the prostate and those that have prostatic extension. Magnetic Resonance Imaging is a first-line examination in the study of prostate pathology. Access to this type of exams is not yet widely available due ...
Uncertainties in Plant Species Niche Modeling under Climate Change Scenarios
Passos, Isabel; Figueiredo, Albano; Almeida, Alice Maria; Ribeiro, Maria MargaridaSpecies distribution models (SDMs) have been used to forecast the impact of climate change on species’ potential distribution, with results that might support decisions for conservation and biodiversity management. Despite their vulnerability to parameterization and data quality input, SDM use has been increasing in the last decades. In fact, inappropriate inputs and the lack of awareness about the effects of m...
How will climate change impact maritime pine forest distribution and productivi...
Alegria, Cristina Maria; Almeida, Alice M.; Ribeiro, Maria Margarida; Martins Roque, Natália; Fernandez, Paulo; Gerassis, SakiPortuguese maritime pine forests are severely affected by forest fires. The study aimed at modelling: (1) species’ current distribution and productivity; and (2) species’ distribution for projected future climate change scenarios. The land cover, national forest inventory, and environmental data were used. A Bayesian Machine Learning (ML) analysis allowed exploring the most influential environmental variables. ...
Pyrenean oak forests under global change - integrating projected suitable areas...
Passos, Isabel; Almeida, Alice A.; Vila-Viçosa, Carlos; Ribeiro, Maria Margarida; Figueiredo, AlbanoForests provide broad ecosystem services (ES), and their contribution to regulation and maintenance services (e.g. carbon sequestration, soil formation, habitat protection, erosion control) explains why forest recovery/expansion is an effective nature-based solution for climate change mitigation. Thus, forest restoration measures must integrate results about expected changes in species distribution, as future c...
Big data help to define climate change challenges for the typical Mediterranean...
Almeida, Alice Maria; Ribeiro, Maria Margarida; Ferreira, Miguel R.; Roque, Natália; Quintela-Sabarís, Celestino; Fernandez, PauloClimate change’s huge impact on Mediterranean species’ habitat suitability and spatial and temporal distribution in the coming decades is expected. The present work aimed to reconstruct rockrose (Cistus ladanifer L.) historical and future spatial distribution, a typically Mediterranean species with abundant occurrence in North Africa, Iberian Peninsula, and Southern France. The R ensemble modeling approach was ...
Multitemporal land use and cover analysis coupled with climatic change scenario...
Almeida, Alice Maria; Delgado, Fernanda; Roque, Natália; Ribeiro, Maria Margarida; Fernandez, PauloClimate change and land use and land cover (LULC) change are impacting the species’ geographic distribution, causing range shifts and reducing suitable habitats. Asphodelus bento-rainhae subsp. bento-rainhae (AbR) is an endangered endemic plant restricted to Serra da Gardunha (Portugal), and knowledge of those changes will help to design conservation measures. MaxEnt was used to model AbR’s current distribution...
Magnetic resonance spectroscopy (1H) of the intervertebral lumbar disc in the a...
Cruz Maurício, J.; Ribeiro, Maria MargaridaAims – To show the potential of magnetic resonance spectroscopy (1H-MRS) in the diagnosis of degenerative disease of the lumbar disc and to advocate the addition of this technique in the classification of the invertebral disc involution vs degeneration (L4-L5 and L5-S1) in the clinical routine of lumbar pain status, not related with mechanic causes. Material and method – We studied 102 out of 123 lumbar interve...
Ressonância magnética no estudo do Locus coeruleus e a relação com o processo c...
Bulhões, Margarida; Ribeiro, Maria Margarida; Veiga, LuisaIntrodução: A degeneração progressiva dos neurónios do Locus Coeruleus associada à diminuição de recetores adrenérgicos, alvos da Noradrenalina, conduz a uma diminuição da função cerebral, provocando uma baixa resposta hemodinâmica e atividade neuronal. A disfunção noradrenérgica pode, ainda, interromper a capacidade de monitorizar estímulos externos e alterar o processo cognitivo da atenção, como acontece na D...
Magnetic resonance imaging in the study of the Locus Coeruleus and the relation...
Bulhões, Margarida; Ribeiro, Maria Margarida; Veiga, LuísaIntroduction: The progressive degeneration of LC neurons associated with a decrease in adrenergic receptors, targets of NA, leads to a decrease in brain function, causing a low hemodynamic response and neuronal activity. Noradrenergic dysfunction can also interrupt the ability to monitor external stimuli and alter the cognitive process of attention, as in AD and PD. Objectives: The investigation sought to unite...