Browsing by Issue Date, starting with "2024-09-11"
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- Comunicação organizacional interna : implementação do projeto SANUS03 na Câmara Municipal de Vila VerdePublication . Oliveira, Ana Catarina da Silva; Cunha, Manuel António Antunes daA presença das empresas no ambiente digital tornou-se essencial, tanto no que se refere à sua visibilidade, competitividade e relação com os clientes, como no âmbito dos colaboradores internos das respetivas instituições. O processo de digitalização exige uma abordagem global, envolvendo o uso de novas tecnologias, a promoção de uma cultura de inovação e uma gestão eficaz dos processos organizacionais. O presente relatório de estágio teve como objetivo o estudo da comunicação organizacional interna da Câmara de Vila Verde, no âmbito do Projeto SANUS 03 que visava a promoção da saúde e bemestar dos trabalhadores do município. Procuramos indagar até que ponto a comunicação interna pode ser um fator potenciador de saúde e bem-estar em contexto autárquico. Embora a criação de um grupo privado na rede social Facebook tenha potenciado o sucesso da iniciativa, verificamos que um tal canal de comunicação digital deve ser acompanhado por uma certa proximidade com os diversos departamentos e níveis hierárquicos, assim como uma pedagogia e formação na literacia digital e uma escuta ativa das expetativas dos funcionários.
- Fronto-central changes in multiple frequency bands in active tactile width discrimination taskPublication . Ramos, Tiago; Ramos, Júlia; Pais-Vieira, Carla; Pais-Vieira, MiguelThe neural basis of tactile processing in humans has been extensively studied; however, the neurophysiological basis of human width discrimination remains relatively unexplored. In particular, the changes that occur in neural networks underlying active tactile width discrimination learning have yet to be described. Here, it is hypothesized that subjects learning to perform the active version of the width discrimination task would present changes in behavioral data and in the neurophysiological activity, specifically in networks of electrodes relevant for tactile and motor processing. The specific hypotheses tested here were that the performance and response latency of subjects would change between the first and the second blocks; the power of the different frequency bands would change between the first and the second blocks; electrode F4 would encode task performance and response latency through changes in the power of the delta, theta, alpha, beta, and low-gamma frequency bands; the relative power in the alpha and beta frequency bands in electrodes C3 and C4 (Interhemispheric Spectral Difference—ISD) would change because of learning between the first and the second blocks. To test this hypothesis, we recorded and analyzed electroencephalographic (EEG) activity while subjects performed a session where they were tested twice (i.e., two different blocks) in an active tactile width discrimination task using their right index finger. Subjects (n = 18) presented high performances (high discrimination accuracy) already in their first block, and therefore no significant improvements were found in the second block. Meanwhile, a reduction in response latency was observed between the two blocks. EEG recordings revealed an increase in power for the low-gamma frequency band (30–45 Hz) for electrodes F3 and C3 from the first to the second block. This change was correlated with neither performance nor latency. Analysis of the neural activity in electrode F4 revealed that the beta frequency band encoded the subjects’ performance. Meanwhile, the delta frequency band in the same electrode revealed a complex pattern where blocks appeared clustered in two different patterns: an Upper Pattern (UP), where power and latency were highly correlated (Rho = 0.950), and a sparser and more uncorrelated Lower Pattern (LP). Blocks belonging to the UP or LP patterns did not differ in performance and were not specific to the first or the second block. However, blocks belonging to the LP presented an increase in response latency, increased variability in performance, and an increased ISD in alpha and beta frequency bands for the pair of electrodes C3–C4, suggesting that the LP may reflect a state related to increased cognitive load or task difficulty. These results suggest that changes in performance and latency in an active tactile width discrimination task are encoded in the delta, alpha, beta, and low-gamma frequency bands in a fronto-central network. The main contribution of this study is therefore related to the description of neural dynamics in frontal and central networks involved in the learning process of active tactile width discrimination.
- Development of edible coatings based on pineapple peel (Ananas comosus L.) and yam starch (Dioscorea alata) for application in acerola (Malpighia emarginata DC)Publication . Galvão, Maria Brígida Fonseca; Stamford, Thayza Christina Montenegro; Melo, Flávia Alexsandra Belarmino Rolim de; Lima, Gerlane Souza de; Oliveira, Carlos Eduardo Vasconcelos de; Oliveira, Ingrid Luana Nicácio de; Bidô, Rita de Cássia de Araújo; Pintado, Maria Manuela Estevez; Oliveira, Maria Elieidy Gomes de; Stamford, Tania Lucia MontenegroAcerola fruit has great nutritional and economic relevance; however, its rapid degradation hinders commercialization. The use of coatings reduces post-harvest biochemical modifications and provides physical and biological protection for vegetables such as acerola. This study developed and characterized an edible coating made from pearl pineapple peel flour (PPPF) and yam starch (YS) to preserve the quality standards of acerola fruits during storage at room temperature and under refrigeration. The edible coating, composed of 4 g of PPPF, 3 g of starch, and 10% glycerol, presented excellent moisture content (11%), light tone (L* 83.68), and opacity (45%), resistance to traction of 27.77 Mpa, elastic modulus of 1.38 Mpa, and elongation percentage of 20%. The total phenolic content of the coating was 278.68 ± 0.45 mg GAE/g and the antioxidant activity by DPPH was 28.85 ± 0.27%. The quality parameters of acerolas were evaluated with three treatments: T1—uncoated fruits; T2—fruits coated with 1% glycerol; and T3—fruits coated with PPPF-YS. The T3 treatment reduced the weight loss of stored acerolas, maintaining the light and bright color of the fruits, and delayed the decrease in soluble solids, especially in refrigerated fruits. Therefore, edible coatings based on pineapple flour and yam starch are effective technologies for controlling the physical and physicochemical parameters of acerolas during storage, benefiting the post-harvest quality of this fruit.
- Biocides in food packaging: safety concerns and migration insightsPublication . Vieira, Tiago Monteiro; Singh, Srishti; Pereira, Joel; Poças, FátimaIntroduction: Context: Biocides such as BIT (1,2-Benzisothiazolin-3-one), CMIT (Chloromethylisothiazolinone), and MIT (Methylisothiazolinone) are commonly used in food packaging to preserve materials and ensure safety due to their antimicrobial properties. Problem: The potential migration of these biocides into food contact materials (FCMs) raises concerns, especially since their behavior under various conditions is not well understood. Objective: This study aims to characterize the extraction behavior of BIT, CMIT, and MIT from Kraft paper, focusing on its potential migration when used in food packaging. Results & Conclusions: The extraction of biocides from food packaging materials is influenced by the solvent type, temperature, and biocide properties (e.g., log Kow). BIT and CMIT showed higher solubility and extraction in ethanol, while MIT has a stronger affinity for water, reducing its extraction in ethanol. The complex interactions between temperature, solvent type, and the Kraft paper matrix affect biocide availability and migration patterns. Findings highlight the need for rigorous standards in food safety regarding biocide use in food packaging, emphasizing the need for further research of biocide behavior migration in various matrices.