Browsing by Issue Date, starting with "2019-09"
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- Determination of glyphosate bioconcentration in lettuce (Lactuca sativa) simultaneously exposed to cylindrospermopsin in a soil systemPublication . Lessa, P.; Sengupta, S.; Pinto, Edgar; Freitas, Marisa; Azevedo, J.; Oliveira, F.; Campos, A.; Vasconcelos, V.Glyphosate has become the most widely used herbicide worldwide. The mode of action of this herbicide is linked to the inhibition of 5-enolpyruvylshikimate-3-phopsphate synthase enzyme, which blocks the plant’s biosynthesis of aromatic amino acids.
- Computational simulation of the cupula behavior in vestibular pathologies of the inner earPublication . Santos, Carla; Gentil, Fernanda; Parente, Marco; Areias, Bruno; Belinha, Jorge; Natal Jorge, RenatoVertigo is reported as one of the most common symptoms in the world, commonly related with vestibular disorders. It is considered the third most frequent complaint in medicine, transmitting a sense of inadequacy and insecurity, mainly in elders. The aim of this work is to contribute to a better understanding on how the vestibular system works, mainly during vestibular rehabilitation process. This knowledge will help in the development of new techniques that will facilitate a more efficient rehabilitation. Vestibular rehabilitation consists in a set of exercises, known as maneuvers, that can reduce and even eliminate the symptoms of dizziness and imbalance associated with a vestibular disorder.
- Portuguese consumer exposure to cosmetic products: risk assessment of ingredients in facial and body moisturizersPublication . Rodrigues, Matilde; Silva, Manuela Vieira Da; Marques, A.The cosmetic industry launches thousands of products annually. Most chemicals are added to the cosmetic product in the form of preservatives and fragrances and some are classified as toxic and prohibited from being used as ingredients because they can cause cancer diseases, mutations, reproductive toxicity, and endocrine disruption.
- "As professores escrevem muito!": Representações de estudantes do 1.º Ciclo sobre a docênciaPublication . Moreira, Ana Isabel; Duarte, PedroAs representações sociais podem ser entendidas como sistemas de significação utilizados na orientação de ações individuais ou mesmo como referência para a categorização de pessoas e acontecimentos (Jodelet, 2001; Moscovici, 1998). Aquelas conceções constroem-se, mesmo por quem ainda vai dando os primeiros passos na experiência educativa que é a frequência quotidiana da escola, como resultado de influências várias, para além dos próprios recursos cognitivos: os discursos sociais, os meios de comunicação, as tradições escolares ou a subjetividade inerente às marcas histórica e socialmente situadas (Moscovici, 2001; Jodelet, 2011). E no dia-a-dia, inevitavelmente, são elas que permitem a identificação como grupo social, a comunicação com os demais, a conferência de sentido a intervenções quotidianas, seja o significado das práticas concretizadas pelos professores ou os comportamentos adotados pelos pares na sala de aula (Castorina, 2017; Flick e Foster, 2008; Wagner et al., 1999). Este trabalho pretende, assim, apresentar as representações construídas por 22 estudantes a frequentarem o 1.º Ciclo do Ensino Básico, em instituições de ensino portuguesas, sobre o seu atual professor (titular da turma), bem como as idiossincrasias inerentes à profissão docente. As suas perspetivas emergem como elementos significativos para se analisar e conceptualizar aquela que, socialmente, se vai veiculando como a identidade de tal grupo profissional, desde logo pelos desenhos e palavras de quem começa agora o seu percurso escolar. Metodologicamente, optou-se por uma investigação de carácter misto (envolvendo análise de dados quantitativa e qualitativa), recolhendo-se as respostas dos alunos por via de um inquérito por questionário. Este contemplou três questões distintas: uma tradicional, de resposta livre e um pouco mais extensa; outra para associação de palavras e uma menos habitual e que requereu a elaboração de um desenho individual sobre a figura do professor. Os dados recolhidos tendem a representar uma professora (docente do sexo feminino), que tem uma profissão importante, centrada na aprendizagem, semelhante ao que é perspetivado por Roldão (2005). A par disso, reconhecem-se dois elementos simbólicos estruturais nessas representações: i) o quadro de ardósia, com especial destaque na sala de aula, estando os alunos centralmente a fixarem-no; ii) o ponteiro, enquanto instrumento utilizado, exclusivamente, pela docente.
- Occupational exposure to metals fumes: A case study in a metalworking industryPublication . Reis, P.; Pinto, Edgar; Neves, P.; Ferreira, T.; Rodrigues, MatildeDuring welding process, a visible smoke that contains harmful metal fume and gas byproducts is produced. The exposure to these welding fumes can bring adverse effects for workers’ health, such as fever, bronchitis, fibrosis, chronic inflammation, functional changes in the lung and increased risk of cancer. The workers performing welding tasks are directly exposed to the metal particles produced by the weld. However, it is important to realize that not only the welders may be exposed to these fumes. If there is no particle suppression, these particles can reach other workers.
- How the computational methods can contribute to better knowledge of the earPublication . Gentil, Fernanda; Parente, Marco; Santos, Carla; Areias, Bruno; Belinha, Jorge; Jorge, Renato NatalThe biomechanical behavior of the human ear can be studied using mathematical approaches, such as the finite element method. This methodology allows to perform simulations to evaluate the influence of sound transmission through all way of the ear, since the sound is selected by the outer ear to the inner ear. The finite element method is currently the preferred method for the numerical solution of partial differential equations, and it is used in several fields of the biological sciences. Due to its large applicability and efficiency, there are several works where this methodology is applied in different specialties, to analyze loads, strains or displacements, as in the case of the biomechanical study of the ear. From CT images, three-dimensional accurate computational models are created. The technique employs a set of calculations of numerical analysis for solutions of kinematic (displacements and rotations) and mechanical aspects (strength, stress, pressure, deformation). The use of these computer models enables the motion analysis of all ossicular chain points at any moment.
- Evaluation of the impact of pre-treatment and extraction conditions on the polyphenolic profile and antioxidant activity of Belgium apple woodPublication . Withouck, Hannes; Boeykens, Annick; Vanden Broucke, Machteld; Moreira, Manuela M.; Delerue-Matos, Cristina; De Cooman, LucThis study describes the possibilities of valorising a waste stream that originates from apple wood by mapping the reducing capacity and phenolic profile from extracts derived from apple tree (Malus domestica). This study evaluated the efficiency of warm solvent extraction (WSE) and ultrasound-assisted extraction (UAE) techniques for extracting antioxidant phenolic compounds from the bark and core wood of an apple tree cultivated in the north-eastern part of Belgium. Furthermore, the influence of the pre-treatment technique, namely, fresh, oven-dried, and freeze-dried samples, respectively, on the yield of polyphenols was studied. Fresh bark extract obtained by UAE—the most efficient extraction technique—employing acetone 60% v/v contains the highest levels of phenolic compounds as well as the highest antioxidant activity. High-performance liquid chromatographic analysis shows that phloridzin is the major compound of the identified polyphenol markers present in bark and core wood extracts. Based on the obtained results, it may be possible to produce a polyphenolic extract from apple wood at an industrial scale without extensive costs or altering the antioxidant properties. This study reveals the potential of apple tree wood residues valorisation through the recovery of phenolic compounds for food, pharmaceutical, and cosmetic applications.
- Occupational noise exposure and cardiovascular diseases: A pilot study in a metalworking industryPublication . Filipe, J.; Carvalhais, Carlos; Neves, P.; Sena, M.; Baeta, Cristina; Teixeira, J. P.; Pereira, C. C.Exposure to noise is an important risk to human health. Despite that, its control in the occupational environment is only made considering the prevention of hearing loss. Portuguese law for this subject neglect the non-auditory effects, such as sleep disturbances, annoyance and stress, reduction of cognitive performance and cardiovascular diseases.
- Exposure of Mytilus galloprovencialis to diarrhetic shellfish poisoning toxin: food safety implicationsPublication . Silva, M.; Campos, A.; Pérez, D.; Azevedo, C.; Costa, P. Reis; Martins, J. C.; Vasconcelos, V.; Freitas, MarisaThroughout the world, toxins produced by algae are responsible for approximately 60000 human food poisonings yearly. Shellfish toxins cause damage to wildlife and have a negative economic impact on recreation, tourism and shellfish industry, being almost a worldwide phenomenon. Dinoflagelates such as Dynophysis and Prorocentrum lima are considered a primary producer of diarhetic shellfish toxins, such as Okadaic Acid (OA) and Dinophysistoxins (DTXs), which can be accumulated in the tissues of the bivalves. Bioaccumulation process could increase the concentration of OA and DTXs at risky level, making bivalves unsafe for human consumption.
- O 1.º Ciclo do Ensino Básico: Que identidade(s)?Publication . Duarte, Pedro; Moreira, Ana Isabel; Diogo, Fernando; Fernandes, Dárida; Ribeiro, Deolinda; Costa, José António; Queiroz Canha, Manuel BernardoO presente livro resulta das comunicações apresentadas no seminário O 1.º ciclo do Ensino Básico — Que identidade(s)? | Currículo, práticas e formação docente, que teve como objetivo primeiro a partilha de perspetivas e investigações sobre o currículo, as práticas e a identidade docente, para uma reflexão mais ampla no âmbito do 1.º Ciclo do Ensino Básico.