Browsing by Issue Date, starting with "2024-02-16"
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- Relação entre nomofobia, phubbing e fobia social em jovens adultos e em adultos PortuguesesPublication . Sousa, Dorenilde Tavares de; Maia, Berta Maria Marinho Rodrigues; Dias, Paulo César AzevedoSegundo a literatura, há uma relação entre a nomofobia, phubbing e fobia social. Porém, que seja do nosso conhecimento, não existem estudos que cruzem os três construtos. O presente trabalho visa explorar os níveis de nomofobia, de phubbing e de fobia social e se existem diferenças entre os sexos e as idades e a relação entre o nomofobia, phubbing e a fobia social em Jovens adultos e adultos Portugueses. A amostra, é constituída por, 316 jovens adultos e adultos, com idade entre 18 aos 59 anos (M = 25.71, DP = 8.23), que preencheram um questionário sociodemográfico, uma Escala de Nomofobia, uma Escala de Phubbing e uma Escala de Fobia Social. Os resultados revelam que 62% dos participantes apresentaram nomofobia em nível moderado, com 21.8% em risco alto, sem nenhum participante sem nomofobia. Cerca de 21.8% dos participantes experimentaram ansiedade e 24.1% evitamento, indicando possíveis problemas de ansiedade social. A obsessão por telefone foi a dimensão mais alta do phubbing, com uma média de 12.81. Foram encontradas correlações positivas entre nomofobia e phubbing. A nomofobia e a fobia social correlacionaram-se, positivamente, exceto, pela dimensão "Evitamento" da EAESDIS, que teve uma correlação negativa. As diferenças de género, mostraram que as mulheres tinham pontuações mais altas em nomofobia, phubbing e fobia social. Não foram encontradas diferenças significativas na idade em relação ao phubbing e à fobia social. Contudo, a nomofobia teve diferenças estatisticamente significativas, com pontuações mais altas em jovens adultos. Os nossos resultados permitiram, na generalidade, confirmar a relação entre a nomofobia, phubbing e fobia social. Os níveis de nomofobia, (quer de risco médio, quer alto) alertam-nos para a necessidade de continuarmos a estudar este fator, de modo a perceber, se este aumento, é ou não adaptativo e a não ser, a traçar programas de prevenção e/ou intervenção.
- Climate migration in post-apocalyptic narratives on the mainstream screenPublication . Koncz, Linda; Villas Boas, AlexThrough the perspective of ‘catastrophising thought’, this work undertakes a comparative analysis of five post-apocalyptic films dealing with climate migration: Waterworld, Snowpiercer, Interstellar, Mad Max: Fury Road and Mortal Engines in order to identify recurring themes within their dystopian societies. These narratives share an apocalyptic literary approach, intertwining biblical elements to draw a subjectivity that enables us to see the end of our known world order simultaneously as a new beginning. In the plots, technological development is related to the disrespect of ecological harmony and, therefore, extreme climate conditions. The changes in the films’ narratives lead to a new kind of spirituality and a new concept of home. This article concludes by evaluating how these findings relate to the real, contemporary world.
- Safety profile of ZnO active packaging PBAT based biomaterial for food packaging: first tier evaluationPublication . Singh, Srishti; Pereira, Joel; Guerreiro, Patricia; Selbourne, Céu; Paula, Cidália; Cunha, António; Sousa, Clara; Poças, FátimaMaterials produced with polybutylene adipate terephthalate (PBAT) and starch are raising great interest for packaging and food contact applications, including as support for active antimicrobial agents such as zinc oxide nanoparticles (ZnO). Studies focusing on the safety of these materials as evaluated with the current reference rules for food contact materials, are lacking. A commercially available PBAT/starch-based material was incorporated with ZnO and the overall and specific migration of the films were studied at different conditions of simulants and temperature. The overall migration (OM) limit is exceeded due to the release of starch as confirmed by infrared spectroscopy. The impact of temperature on the OM was higher for the ethanol 10%. The incorporation of ZnO particles reduced the OM, for both temperatures tested for ethanol 10%. The impact of incorporating ZnO in the migration into acetic acid was relevant at 20 °C only. Beside starch, most relevant migrants were PBAT oligomers made of butanediol and two different kinds of diacids, terephthalic acid or adipic acid. The cyclic diester of 1,4-butanediol and adipic acid, butenyl butanediol adipate in either cyclic and linear form and oligomers terephthalic acid, but-3-enyl hexadecyl ester were detected in an untargeted screening with GC-MS. A second TPA oligomer was not fully identified. The specific migration was in several cases, depending on the simulant and on the temperature, higher than 50 μgkg−1 (semi-quantification), the threshold value for requiring additional toxicity test (genotoxicity tests applied to oligomers below 1000 Da). This indicates the need for more detailed studies with more precise quantification to verify the need for toxicity tests.
- Egyptian citrus essential oils recovered from lemon, orange, and mandarin peels: phytochemical and biological valuePublication . Ibrahim, Faten Mohamed; Mohammed, Reda Sayed; Abdelsalam, Eman; Ashour, Wedian El-Sayed; Magalhães, Daniela; Pintado, Manuela; Habbasha, El Sayed ElCitrus peels are an important by-product of citrus processing industries, but a large part is considered waste. There has been increased attention in the last five years on these industrial by-products, especially those containing residual essential oils (EOs). Lemon, orange, and mandarin peels from Egypt were subjected to hydro-distillation to obtain EOs, which were analyzed via mass spectrometry (GC/MS) and by building Global Natural Products Social Molecular Networking (GNPS-MN) for the purpose of visually exploring the volatile components of citrus species. The constructed MN revealed that D-Limonene, α-pinene, and β-pinene are the dominant volatile constituents in the three Egyptian citrus species. The EOs from three citrus peels exhibited promising activities as antioxidants using two tested methods: 1,1-diphenyl-2-picryl-hydrazil (DPPH) and nitric oxide (NO) compared with vitamin C. Lemon EO proved excellent antimicrobial activity against Gram-positive and negative bacteria. Additionally, the three citrus EOs showed good activities against the yeast Candida albicans. Regarding the anti-inflammatory assay, the three citrus EOs showed promising activities as COX-1 and COX-2 inhibitors. This study concludes that EOs extracted from citrus peel waste can be valorized as an innovative strategy for food preservation or may be incorporated in cosmetics and pharmaceutical formulations in alignment with circular economy principles.