Browsing by Issue Date, starting with "2021"
Now showing 1 - 10 of 2995
Results Per Page
Sort Options
- Experiências de educação bilíngue para surdos: entrelaçamentos entre Brasil e PortugalPublication . Sofiato, Cássia Geciauskas; Carvalho, Paulo Vaz de; Coelho, Orquídea
- Influence and comparison of thermal, ultrasonic and thermosonic treatments on physicochemical quality of orange juicePublication . Amir-Tahi, Akila; Miller, Fátima A.; Silva, Cristina L. M.Orange juice is the most popular and consumed juice worldwide, associated with healthy eating habits. Thermal pasteurization treatments are used to preserve industrially produced juice. Unfortunately, this process removes many nutritious compounds. Therefore, other milder treatments are being studied to minimize the impact on the product's final quality. The main goal of this study was to evaluate the effect of thermosonication (TS) treatment on the quality of orange juice in comparison with heat (HT) and ultrasound (UT) treatments alone. Commercial pasteurized orange juice was treated by UT, HT or TS in a sonoreactor (20 kHz and 80% amplitude) at different temperatures 20, 30, 40, 50 and 60 °C for 90, 60, 60, 30 and 30 min, respectively. These treatment times were chosen to guarantee the Staphylococcus aureus inactivation. Physicochemical characteristics, such as pH, colour and Brix, and microbial cell counts, were evaluated before and after treatments. Principal components analysis (PCA) was carried out to detect simple patterns and differences.All treatments could reduce the S. aureus presence in at least 3 log cycles, except the HT at 20, 30 and 40 °C, where an increase in microbial counts was attained. The majority of quality characteristics were not significantly affected by the applied treatments, except a* value for US 20, 30 40 and 50°C, Brix for TS 60°C and pH for US 30 and 40 °C, TS 50°C and HT 20 and 50 °C. PCA revealed two components with eigenvalues greater than one, which explained 56.1% and 28.4% of the total variance, respectively. The first component was mostly influenced by a*, pH, L*, b* and Chroma, while the second by Hue and microbial inactivation. The second component allowed a clear distinction between types of treatment, while the first component allowed separation among the processing conditions of temperature/time.
- Long-term stability of a non-adapted aerobic granular sludge process treating fish canning wastewater associated to EPS producers in the core microbiomePublication . Paulo, Ana M. S.; Amorim, Catarina L.; Costa, Joana; Mesquita, Daniela P.; Ferreira, Eugénio C.; Castro, Paula M. L.The tolerance of aerobic granular sludge (AGS) to variable wastewater composition is perceived as one of its greatest advantages compared to other aerobic processes. However, research studies select optimal operational conditions for evaluating AGS performance, such as the use of pre-adapted biomass and the control of wastewater composition. In this study, non-adapted granular sludge was used to treat fish canning wastewater presenting highly variable organic, nutrient and salt levels over a period of ca. 8 months. Despite salt levels up to 14 g NaCl L−1, the organic loading rate (OLR) was found to be the main factor driving AGS performance. Throughout the first months of operation, the OLR was generally lower than 1.2 kg COD m−3 day−1, resulting in stable nitrification and low COD and phosphorous levels at the outlet. An increase in OLR up to 2.3 kg COD m−3 day−1 disturbed nitrification and COD and phosphate removal, but a decrease to average values between 1 and 1.6 kg COD m−3 day−1 led to resuming of those processes. Most of the bacteria present in the AGS core microbiome were associated to extracellular polymeric substances (EPS) production, such as Thauera and Paracoccus, which increased during the higher OLR period. Ammonium-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) species were detected in AGS biomass; while AOB were identified throughout the operation, NOB were no further identified after the period of increased OLR. Different polyphosphate-accumulating organisms (PAOs) were detected along the process: Candidatus Accumulibacter, Tetrasphaera and Gemmatimonas. A non-adapted granular sludge was able to treat the fish canning wastewater and to tolerate salinity fluctuations up to 14 g L−1. Overall, a high microbial diversity associated to EPS producers allowed to preserve bacterial groups responsible for nutrients removal, contributing to the adaptation and long-term stability of the AGS system.
- An elephant in the room? (Re)building possibilities and challenges for promoting relationships between supervisors and PhD students at neoliberal universityPublication . Jesus, Antonela PereiraPhD student pathway studies demonstrate how this teaching cycle has high dropout, dissatisfaction, and mental health problems (McAlpine & Norton, 2006; Stubb, Pyhältö & Lonka, 2011; Anttila et al., 2015; Levecque et al., 2017). These are problems with external and internal factors that play against each other and the relationship with supervisors is a widely recognized aspect to minimize and, in certain situations, prevent such situations (Dharmananda & Kahl, 2012; Filho & Martins, 2006; Hunter & Devine, 2016). However, this relationship can serve both as a source of support and as a critical element (Schmidt & Hansson, 2018). These relationships are contextualized in a neoliberal culture, including the imposition of the “publish or perish culture” in which teaching and pedagogy lose strength in the face of research understood as an end in itself (Moosa, 2018). Considering the commitment of social work to the promotion of human relations both in formationWeidman & Stein, 2003) and in practice (IFSW, 2014)this paper proposes to analyze and understand students' experiences and perceptions regarding the doctoral supervision relationship, in today’s context. More specifically, this work deepens the students' conceptions about the following aspects: i) the reasons that led to the choice of the supervisor and the expectations regarding this process, namely in terms of the support received and in the academic socialization; ii) satisfaction with the relationship, favoring the characteristics and competences indicated in this area, the components of the support received as well as their articulation with critical moments in the doctoral course; iii) the way they envisage the repercussions of neoliberal logic in academia including, but not limited to, their articulation with the frequency and quality of the supervisory process; iv) and finally the way they perceive the supervisor as a role model of professional socialization, in the investigative and pedagogical aspect., this research is a qualitative, descriptive and phenomenological study using semi-structured interviews with 15 students from the 2nd and 3rd year of PhD.
- Nursing epidemiological approach of hypertension management in a Public Health Service from the Northern Region of PortugalPublication . Melo, Pedro; Miranda, Dário; Santos, Sandra; Sousa, Sérgio; Cardoso, Teresa; Pereira, AlexandraBackground: Epidemiological surveillance of a nursing diagnosis is an approach anchored in a post-modern epidemiology focused on a person’s health disease responses. Regarding public health priorities, the population where our study occurred had as a priority problem arterial hypertension. Related to this chronic disease, nursing diagnoses about health disease responses in primary healthcare has, as a major focus, Therapeutic Regimen Management. Our aim was to study the nursing diagnosis in this issue from an epidemiological approach. Methods: A descriptive study from an epidemiological approach was developed, analyzing nursing diagnoses in hypertensive patients. Results: We found 17.7% of undiagnosed patients and better diagnoses in patients with complications than in those without complications. Conclusions: Nursing records need to be improved in order to promote more robust studies in the post-modern epidemiology for the future.
- Sobre os crimes na lei antidopagemPublication . Cunha, José Damião da
- On Emily Dickinson’s "A little madness in the spring"Publication . Eckerson, Sara
- Evolution of gentamicin and arsenite resistance acquisition in Ralstonia pickettii water isolatesPublication . Ferro, Pompeyo; Vaz-Moreira, Ivone; Manaia, Célia M.Ralstonia pickettii are ubiquitous in water environments. Members of this species are frequently, but not always, resistant to both gentamicin and arsenite. Gentamicin and arsenite co-resistance and the putative molecular mechanisms were investigated. A group of 37 R. pickettii strains isolated from drinking water and hospital wastewater were characterized for gentamicin and arsenite resistance phenotypes, the number and size of plasmids, and screened for genetic elements associated with arsenite tolerance, Integrative and Conjugative Elements (ICEs), among other. The genomes of three representative strains were compared. Most gentamicin resistant (GR) isolates (32/33) were resistant to arsenite, and harbored ICE- and ars operon-related genes. These genetic elements were not detected in any of the five arsenite susceptible strains, regardless of the GR (n = 1) or gentamicin susceptibility (GS) (n = 4) phenotype. The comparison of the genomes of two GR (one resistant and one susceptible to arsenite) and one GS strains suggested that these phenotypes correspond to three phylogroups, distinguished by presence of some genes only in GR isolates, in addition to point mutations in functional genes. The presence of ICEs and ars operon-related genes suggest that arsenite resistance might have been acquired by GR lineages.
- Sugarcane as a sustainable source of biologically active carboxymethyl cellulosePublication . Casanova, Francisca; F. Pereira, Carla; Freixo, Ricardo; Costa, Eduardo; Ribeiro, Alessandra A.; Pintado, Manuela E.; Fernandes, João C.; Ramos, Oscar L.