A remark on the blow-up of the solutions of the equation ut+f(u)a(u)ux=h(x,u)

Sin resume

A developing agenda for Lisbon within the twenty-first century

UID/SOC/04647/2013Divided by interdisciplinary realms of application, both climate change and urbanism are ultimately bound together by cause-and-effect in our ever mutable cities. Although suggested that cities are changing faster than Mankind have been able to adjust out thinking, the yearly dissemination scientific data on climatic change is continually improving the efficiency of urbanism to tackle new looming paradigms. Respectively, it is considered that urbanism encounters its greatest opportunities in this uncertain 'third modernity', where flexible approaches such as 'what if?' scenarios allow urbanism to continuously uphold the ever evolving identity and continuum within eventful horizons. This collaboration between these two interrelating realms of contemporary practice is currently being applied upon the case of Lisbon, where regional and local climate change scenarios are assessed in terms of their potential territorial impacts. This originated the opportunity to evaluate how the city components and functioning within its waterfronts shall be affected by climate change. Resultantly, and embedded within its niche, urbanism presents a new creative laboratory where flexible and innovative urban adaptation strategies can be developed to counter-act the impending impacts upon Lisbon within the XXI century.publishersversionpublishe

Long-term ley and manure managements have consistent effects on microbial functional profiles and organic C groups across soils from a latitudinal gradient

Soil organic matter (SOM) is important in maintaining soil fertility and other ecosystem functions. Yet, land management in intensive agriculture has caused SOM level to decrease, with knock-on effects for soil fertility and quality. Therefore, land management options that ensure that SOM is not depleted and that soil functions are better sustained are of increasing interest. However, there is limited knowledge on how different land managements affect the composition of SOM and associated microbial functional profiles. Twelve long-term field experiments, covering a wide range of climatic zones and soil types, were selected in Sweden. They focused on the role of combining ley in crop rotations with the manure application (livestock farm), as opposed to the management without ley and receiving only inorganic fertilizer (arable farm). In ten out of the 12 study sites, livestock farm management tended to have higher proportions of aliphatic and double bonded C groups, as estimated by mid-infrared spectroscopy. This was further confirmed by C-13 NMR analysis, which found greater proportions of O-alkyl and di-O-alkyl groups and less aromatic C in livestock farm than arable farm management in five of the eight sites analyzed. The changes in SOM composition were reflected in microbial functional profiles across many sites: soils from livestock farm management utilized more carbohydrates and amino acids, while polymer and aromatic compounds were associated with arable farm management. Overall, shifts in both microbial functional profiles and SOM composition showed great consistency across geographical and climatic zones. Livestock farm management maintained higher levels of microbial functional diversity and were associated with higher proportions of "reactive" C functional groups. Our investigation demonstrates that livestock farm management could maintain soil fertility over the long-term via the changes in SOM composition and the regulation of microbial functional profiles

Pancreas angiosarcoma : case report of a rare cause of abdominal pain

© 2020 The Authors. Published by Elsevier Ltd on behalf of IJS Publishing Group Ltd. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/)Introduction: Pancreas angiosarcoma is a very aggressive malignant neoplasm. The symptoms are nonspecific and it is usually diagnosed at an advanced stage, which confers a poor prognosis. Presentation of case: We present a 56-year-old woman with abdominal epigastric pain and nausea. The abdominal CT-scan showed a 7 cm mass within the head of the pancreas and the pathology and immunochemistry analysis were positive for pancreas angiosarcoma. Intra-operatively the tumor was irresectable. Discussion: Pancreas angiosarcoma is an extremely rare neoplasm with non-specific diagnosis. The histology has a wide range of presentations and immunohistochemistry is required. The surgery appears to be the only effective treatment. Conclusion: We report the seventh case of pancreas angiosarcoma in the English literature. Despite it's irresectability, the patient was asymptomatic two months after surgery, initiating chemotherapy with paclitaxel, with good tolerance.info:eu-repo/semantics/publishedVersio

Organochemical Characterization of Peat Reveals Decomposition of Specific Hemicellulose Structures as the Main Cause of Organic Matter Loss in the Acrotelm

Peatlands store carbon in the form of dead organic residues. Climate change and human impact impose risks on the sustainability of the peatlands carbon balance due to increased peat decomposition. Here, we investigated molecular changes in the upper peat layers (0-40 cm), inferred from high-resolution vertical depth profiles, from a boreal peatland using two-dimensional H-1-C-13 nuclear magnetic resonance (NMR) spectroscopy, and comparison to delta C-13, delta N-15, and carbon and nitrogen content. Effects of hydrological conditions were investigated at respective sites: natural moist, drainage ditch, and natural dry. The molecular characterization revealed preferential degradation of specific side-chain linkages of xylan-type hemicelluloses within 0-14 cm at all sites, indicating organic matter losses up to 25%. In contrast, the xylan backbone, galactomannan-type hemicelluloses, and cellulose were more resistant to degradation and accumulated at the natural moist and drainage site. delta C-13, delta N-15, and carbon and nitrogen content did not correlate with specific hemicellulose structures but reflected changes in total carbohydrates. Our analysis provides novel insights into peat carbohydrate decomposition and indicates substantial organic matter losses in the acrotelm due to the degradation of specific hemicellulose structures. This suggests that variations in hemicellulose content and structure influence peat stability, which may have important implications with respect to climate change

Conceptions on protein, sugar and fats : an investigation with students of basic and higher education

A Bioquímica, enquanto campo do conhecimento busca entender os processos químicos que ocorrem nos sistemas biológicos, sendo assim, é de fundamental importância para o entendimento de nossa própria existência. Apesar de ser uma ciência com conceitos muito bem estruturados, fora do ambiente acadêmico encontramos muitos conhecimentos baseados em senso comum, as chamadas concepções alternativas. Por carregarem uma grande conotação simplista como forma de explicar os fenômenos ou preceitos científicos, tais concepções podem se tornar obstáculos para uma aprendizagem significativa. Dessa forma, é necessário que o professor tome conhecimento de tais concepções para que possa repensar a sua prática, (re) construindo-a de acordo com as necessidades de seus estudantes. Nesse sentido, o presente trabalho visa, por meio de um questionário, inventariar as concepções de estudantes de escolas públicas da cidade de Santa Maria, RS. Foram investigados 34 estudantes de Ensino Fundamental (nono ano), 306 de Ensino Médio (1º, 2º e 3º anos) e 36 de Ensino Superior (formandos do Curso de Licenciatura em Química da Universidade Federal de Santa Maria – RS) sobre os conceitos: Proteínas, Açúcares e Gorduras. De modo geral, podemos perceber nas respostas uma grande tendência em considerar as proteínas como substâncias fundamentais para a saúde, muito relacionadas à “energia” e “força”. Por outro lado, açúcares e gorduras, são considerados substâncias ruins e causadoras de doenças e problemas estéticos, o que não deixa de ser verdade, porém, pode indicar que estes estudantes não têm um claro entendimento do papel de tais substâncias para o correto funcionamento e manutenção dos organismos.Biochemistry, as a field of knowledge seeks to understand the chemical processes that occur in biological systems, it is therefore of fundamental importance for the understanding of our own existence. Despite being a science with well structured concepts, outside the academic environment we find many knowledge based on common sense, the so-called alternative conceptions. On carry a large connotation as simplistic way of explaining the phenomena or scientific principles, these concepts may become obstacles to meaningful learning. Thus, it is necessary that the teacher becomes aware of such concepts to help you rethink your practice, (re) building it according to the needs of their students. In this sense, the present work aims, using a questionnaire, survey the conceptions of students from public schools in the city of Santa Maria, RS. Thirty four students from Elementary School (ninth year), 306 of Secondary Education (1st, 2nd and 3rd years) and 36 of Higher Education (Chemistry Licentiate students, from Federal University of Santa Maria - RS) were investigated on the concepts: proteins, sugars and fats. Overall, we can see a big trend in the responses to consider the proteins as key substances for health, closely related to the "energy" and "force." On the other hand, sugars and fats are considered bad substances and disease-causing and esthetic problems, which is nonetheless true, however, may indicate that these students have no a clear understanding of the role of such substances for proper operation and maintenance of organisms

Cross-Cultural Validation of Quebec User Satisfaction with Assistive Technology 2.0 for Spanish Population (QUEST-2.0 ES)

[Abstract] Background: Assistive technologies (ATs) are resources to promote the independence and participation of people with a disability. The use of standardized tools, based on outcome measures, is essential for guaranteeing high-quality rates. The Quebec User Evaluation of Satisfaction with AT-2.0 (QUEST) is a scale to assess the satisfaction of people using any AT. Objectives: To translate and culturally validate the QUEST-2.0 for the Spanish population (QUEST 2.0-ES). Methods: A validation cross-design and descriptive study. The test-retest reliability, validity, and internal consistency of QUEST 2.0-ES were studied. It was divided into two phases: Sample 1 was formed by 26 persons; in sample 2, 30 persons participated. The conditions included neurological conditions, amputations, rare diseases, and deafness. Results: Thirty-five men and 21 women participated in total. The majority of AT used were those for mobility. QUEST 2.0-ES analysis showed internal consistency values between the test (α = 0.87) and retest versions (α = 0.89). The internal consistency was high for AT (test, α = 0.83; retest, α = 0.87) and Service (test, α = 0.80; retest, α = 0.80). The temporal reliability (1-2 weeks) for test-retest was 0.88. Conclusion: QUEST 2.0-ES showed good psychometric properties in terms of validity and test-retest reliability, and it is a good tool to assess the user's satisfaction with ATs and services.Ministerio de Ciencia e Innovación (España); PID2019-104323RB-C3

URBSOIL-LISBON-Geoquímica dos solos urbanos de Lisboa: caracterização e cartografia, suporte para futuros estudos de saúde humana: resultados preliminares

A Geologia, e em especial a Geoquímica em ambiente urbano, têm-se revelado ferramentas essenciais não só no estudo dos materiais naturais neste ambiente, como na ligação entre a Geologia e a acção antrópica. Este estudo, com uma metodologia que usa vários meios de amostragem, pretende avaliar quais os elementos químicos que podem intervir num contexto de interacção em que as crianças são tomadas como alvo principal. Os primeiros resultados sobre concentrações de elementos químicos para os solos urbanos de Lisboa apontam para uma exposição esparsa na cidade de alguns dos elementos químicos inorgânicos, mas havendo por vezes um zonamento por tipologia de local ou de elemento químico. Foram definidos quatro grupos de pontos de amostragem consoante o tipo de uso, e escolhidos para uma análise mais próxima alguns elementos considerados tendencialmente de input antrópico e que se relacionam com a saúde humana.

Prevalencia de sobrepeso y obesidad en la infancia en las instituciones educativas: públicas vs. privadas

Introduction: epidemiological data indicate that childhood obesity is increasing in Brazil and is identified as a risk factor for early development of chronic diseases. Obesity has been characterized by increased adipose tissue and body weight. Objective: to diagnose and compare the prevalence of overweight and obesity in schoolchildren from public (EPU) and private (EPR) schools. Methods: anthropometrics variables (BMI and DOC [skin folds]) were evaluated in boys (n=91) and girls (n=109) between 8 and 10 years old. There was a higher prevalence of overweight in boys (19.6%) and girls (25.5%) of the EPR compared to boys (6.7%) and girls (8.1%) of the EPU. the obesity level was higher in boys (34.8%) and girls (31.9%) of the EPR compared to boys (6.7%) and girls (6.5%) of the EPU. Positive correlation was obtained between the variables BMI and % body fat in boys (r=0.82) and girls (r=0.85). Results: the results suggest that despite the increase in all social classes, overweight and obesity prevalence were more present in those with higher economic status, confirming therefore a socioeconomic relationship. This finding may lead to a health condition closest to the negative pole. Conclusion: the BMI analysis proved to be an index for efficient determination of overweight and obesity in children.Univ Sao Judas Tadeu, Programa Posgrad Stricto Sensu Educ Fis, BR-03221100 São Paulo, SP, BrazilUniv Fed Sergipe, Aracaju, BrazilUniversidade Federal de São Paulo, São Paulo, BrazilUniversidade Federal de São Paulo, São Paulo, BrazilWeb of Scienc