A theorem of Fr. Fabricius-Bjerre on helices

We give an alternative proof of a theorem proved in [1]

Erosion perceptions, beliefs and the sustainability of coastal areas: an individual or collective endeavour?

Coastal erosion (CE) is a phenomenon that has undergone a conceptual evolution. Nowadays, it is considered a physical and social process that is scientifically studied, quantified, and technically mitigated. It may also be approached by following the individual/collective perceptions of coastal communities. Risk and vulnerability associated with CE may also be addressed by considering different aspects that require a differentiated and trans-disciplinary analysis. A gap regarding the social perception of CE in Portuguese coastal communities was detected in the literature review. Therefore, the initial questions and aim of this study are, as follows: to research the social perceptions of CE and to understand how they impact public decisions/participation aimed at mitigating CE. The purpose of this research, supported by a hypothetical-deductive-approach, is exploratory and followed a multiple-case study strategy. The study was conducted using a mixed methodological paradigm (qualitative and quantitative). The Paramos/Espinho and Costa-da-Caparica cases, which differ environmentally, geographically and socioeconomically, were selected. Social and environmental vulnerability indicators were determined through the Analytical-Hierarchy-Process. These indicators were used to structure/draft the exploratory interviews and a questionnaire. These were applied to three categories of stakeholders: politicians/decision-makers, presidents of recreational associations and fishermen/inhabitants; all chosen by convenience sampling. The interviews identified both the historical and current perception of CE, as well as the public-institutional interaction within the scope of the planned/executed interventions targeting the mitigation of this problem. The questionnaire also revealed memories of damaging events, recognition of the causes of CE and sea encroachment, identification of risk perception, and understanding of the feedback about the strategies developed for mitigating erosion. The results showed that the perception of CE was derived from constructed experience and social memory. For the participants, the erosion «issue» is a serious daily problem. They identified risks and mentioned natural causes that are magnified by both climate change and human causes. Disengagement of the state through inefficient decision-making, inadequate construction and maintenance of defence structures, and through their laxness regarding building new constructions were all mentioned as significant examples of human causes. Participants highlighted the authorities’ lack of sensitivity towards traditional knowledge and their lack of will to welcome/integrate the contribution participants’ experience could make. The main contribution of this work resides in the empirically based development of a model for the social perception of CE, by positioning vulnerability in the context of CE. The perceived vulnerability/risk was deemed to result not only from CE, but also from a variable and dynamic context-specific framework, and from internal/external factors that were identified.info:eu-repo/semantics/acceptedVersio

A Mixed-Method Case Study on a Treatment Centre in the Lisbon Metropolitan Area, Portugal

Funding Information: Funding: R.M.R., L.G., P.J.H. and I.C. were supported by Fundação para a Ciência e a Tecnologia for funds to GHTM-UID/04413/2020 and L.G. from UIDB/00006/2020 and UIDP/00006/2020. Funding Information: R.M.R., L.G., P.J.H. and I.C. were supported by Funda??o para a Ci?ncia e a Tecnologia for funds to GHTM-UID/04413/2020 and L.G. from UIDB/00006/2020 and UIDP/00006/2020. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.Tuberculosis (TB) is an infectious disease associated with poverty. In the European Union TB tends to concentrate in urban settings. In Lisbon, previous studies revealed, the presence of migrant populations from a high endemic country, is one of the risk factors contributing to TB. To better understand TB in foreign-born individuals in the Lisbon Metropolitan Area, a mixed-method case study was undertaken on a TB treatment centre in a high-risk part of urban Portugal. Quantitatively, annual TB cases were analysed from 2008 to 2018, dividing foreign-origin cases into recent migrants and long-term migrants. Qualitatively, we explored recent migrants’ reasons, experiences and perceptions associated with the disease. Our results showed that foreign-born individuals accounted for 45.7% of cases, mainly originated from Angola, Guinea-Bissau, and Cabo Verde. TB in recent migrants increased over the years for Angola and Guinea-Bissau, while for Cabo Verde TB cases were due to migrants residing in Portugal for more than 2 years. Recent migrants’ reasons to travel to Portugal were to study, to live and work, tourism, and seeking better healthcare. Visiting family and friends, historical links and common language were key drivers for the choice of country. Recent migrants and long-term migrants may present distinct background profiles associated with diagnosed TB.publishersversionpublishe

Back to replacement migration: a new European perspective applying the prospective-age concept

Background: The UN Replacement Migration report (2000) had a significant impact in academic and civil society. Its approach consisted of estimating the migration volumes required to mitigate the effects of population decline and ageing. The volume of migrants required to prevent population decline and sustain the working-age population was not particularly high, but the vast number of migrants needed to maintain the potential support ratio was highlighted as an unrealistic goal. Objective: In this paper the UN exercise is revisited and updated by deploying the concept of prospective age to overcome a strict chronological definition of the working-age population. The replacement migration approach is developed from a new European perspective, the temporal series is extended for an additional decade, and alternative operative age-group definitions are compared by projecting replacement migration estimations according to both classic (conventional) and dynamic (prospective) age limits. Conclusions: The key conclusions of the original UN publication are reasserted. In many countries the replacement migration volumes needed to sustain the decline in total population and working-age population are of an order of magnitude similar to recent observed migration. However, even under the prospective-age approach the halt of the ageing process – expressed as the maintenance of the current potential support ratio – remains an unrealistic target. Contribution: We propose the deployment of the prospective-age concept to define dynamic age limits in the definition of working-age population. Because the prospective-age concept is flexible it will be possible to explore other dimensions from this perspective in the future, increasing the analytical potential of replacement migration estimations as a valuable contribution to the demographic ageing debate.info:eu-repo/semantics/publishedVersio

A comparison between biotic indices and predictive models in stream water quality assessment based on benthic diatom communities

http://www.sciencedirect.com/science/article/B6W87-4TBVPV7-1/2/9410c28d535e230ea5a4b3bc5f30512

A comparison between biotic indices and predictive models in stream water quality assessment based on benthic diatom communities

http://www.sciencedirect.com/science/article/B6W87-4TBVPV7-1/2/9410c28d535e230ea5a4b3bc5f30512

Association of Serum 25-Hydroxyvitamin D Concentration with Pulmonary Function in Young Adults

The role of vitamin D on pulmonary function is unclear and is mostly studied in patients, smokers and elderly people. The aim of this paper was to evaluate the association between serum 25-hydroxyvitamin D [25(OH)D] concentration and pulmonary function in young adults. Cross-sectional analysis of 499 individuals that were evaluated at 21 years of age as part of the population-based cohort Epidemiological Health Investigation of Teenagers in Porto (EPITeen). Serum 25(OH)D was categorized according to the Institute of Medicine. Pulmonary function was evaluated using spirometry. Linear regression models were used to estimate the regression coefficients (beta) and its 95% confidence intervals (95% CI), and were adjusted for confounders. Education, smoking, body mass index, and season of evaluation were determinants of serum 25(OH)D concentration. Prevalence of serum 25(OH)D concentration = 50 nmol/L, PEF was significantly lower for those with a concentration of 30 to < 50 nmol/L (beta = -0.576; 95% CI: -0.943, -0.210), and for those with a concentration of <30 nmol/L (beta = - 0.650; 95% CI: -1.155, -0.146). Although only PEF attained statistical significance, the consistent results with the other parameters support the role of serum 25(OH)D to promote better pulmonary function in young adults.This study was funded by FEDER through the Operational Programme Competitiveness and Internationalization and national funding from the Foundation for Science and Technology-FCT (Portuguese Ministry of Science, Technology and Higher Education) (POCI-01-0145-FEDER-016829), under the project Uma abordagem longitudinal a obesidade metabolicamente saudavel: da inflamacao ao perfil de risco cardiovascular (Ref. FCT PTDC/DTP-EPI/6506/2014) and the Unidade de Investigacao em Epidemiologia -Instituto de Saude Publica da Universidade do Porto (EPIUnit) (POCI-01-0145-FEDER-006862; Ref. UID/DTP/04750/2013); and the PhD Grant PD/BD/105824/2014 (Maria Cabral), co-funded by the FCT and the POPH/FSE Program

An Uncommon Cause of Recurrent Dysphagia and Chest Pain in an Adolescent Boy

An 11-year-old boy was brought to the emergency department with a week-long history of widespread pain in his upper abdomen that worsened with deep breathing and eating, sialorrhea, food impaction sensation, and a recent fever. Ten months prior, he had similar symptoms and was diagnosed with a pharyngeal phlegmon. He was treated with antibiotics and dexamethasone. In the current episode, he presented with mild elevation of inflammatory markers, a slight deviation of the trachea on chest X-ray, and a tubular esophageal duplication was identified on a thoracic CT, with its opening observed during the endoscopic study. The patient was admitted for further treatment with fluids, analgesia, and antibiotics, and showed improvement over the next seven days with no significant incidents. Esophageal duplications are a rare congenital anomaly and their exact cause is unknown. Typically found in the posterior mediastinum and lower esophagus, they can cause symptoms such as pain, dysphagia, regurgitation, and malnutrition. Surgical or endoscopic resection can be a treatment option for these malformations.info:eu-repo/semantics/publishedVersio