Estudo cinético da reação da hidroxilamina e n-metilhidroxilamina com o anidrido 1,8-naftálico

TCC (graduação) - Universidade Federal de Santa Catarina. Centro de Ciências Físicas e Matemáticas. Curso de Química.Reações de transacilação têm sido objeto de intensa pesquisa devido a sua grande importância em sistemas bioquímicos. Estas aparecem nas reações de derivados funcionais de ácidos carboxílicos e no mecanismo de ação de enzimas hidrolíticas em sistemas biológicos. O entendimento da reatividade dos grupos nucleófugos e nucleófilos participantes da reação torna-se altamente importante. Um exemplo é a pesquisa de nucleófilos estáveis na detoxificação química, chamados nucleófilos detentores do efeito alfa1. Anidridos reagem eficientemente com aminas primárias e secundárias, fornecendo amidas, via reação de transacilação, estas por sua vez fornecem imidas pela perda de uma molécula de água. A reação de transacilação do anidrido 1,8- naftálico com a hidroxilamina e a N-metilhidroxilamina, ambos nucleófilos detentores do efeito alfa, fornece a N-hidroxiftalimida e o ácido naftalâmico, respectivamente. As constantes de velocidade de segunda ordem obtidas, quando comparados a valores para reações do anidrido 1,8-naftálico com outras aminas primárias, mostram que a reação do anidrido com a hidroxilamina e seu derivado é pelo menos 100 vezes mais rápida, um indicativo da maior nucleofilicidade da hidroxilamina devido o efeito α. Um gráfico de kobs versus a concentração da amina é linear indicando que a reação é de primeira ordem em relação as aminas estudadas o que exclui a participação de uma segunda molécula da amina catalisando a reação de transacilação e atuação da mesma num processo de catálise ácido-base geral. Os resultados até o momento não permitem inferências sobre a etapa limitante da velocidade, mas ainda assim um mecanismo genérico, que satisfaz o conjunto de dados experimentais até agora obtido, pode ser postulado

Perfil dos observadores de aves no Parque Natural da Ria Formosa

In the Algarve the potential for birdwatching tourism is widely recognized, especially in the Ria Formosa Natural Park (RFNP). This study aims to describe birdwatchers' profile in the RFNP. For this purpose, a survey was applied. The results show that the most frequent nationalities of birdwatchers are: British (39%), Dutch (17%) and Portuguese (17%). The majority of birdwatchers are male (55%) and married (57%). The average age is 50 years old. They are highly educated (74% have an academic degree). Concerning profession, the most frequent answer was retired (41%). Respondents are committed to the activity as the majority possess special equipment and practice birdwatching in vacations. This study also tests if nationality is related to other characteristics of the birdwatchers, by using the Kruskal-Wallis and the Chi-square tests. Overall, the results of this study highlight that regional management organizations should invest in developing birdwatching in the RFNP.O potencial para o turismo de birdwatching é vastamente reconhecido, especialmente no Parque Natural da Ria Formosa (PNRF). Este estudo tem como objetivo descrever o perfil dos observadores de aves que visitam o PNRF. Para esse propósito, foi aplicado um questionário. Os resultados mostram que as nacionalidades mais frequentes dos observadores de aves são: britânica (39%), holandesa (17%) e portuguesa (17%). A maioria dos observadores de aves é do sexo masculino (55%), sendo o seu estado civil casado (57%). A idade média é de 50 anos. O seu nível educacional é elevado (74% têm um grau académico). Quanto à profissão, a resposta mais frequente foi aposentado (41%). Os inquiridos estão comprometidos com a atividade, pois a maioria possui equipamentos especiais e pratica observação de aves nas férias. Este estudo também testa se a nacionalidade está relacionada com outras características dos observadores de aves, através de testes Kruskal-Wallis e Qui-quadrado. Os resultados deste estudo indicam que as organizações de gestão regional devem investir no desenvolvimento do birdwatching no PNRF.info:eu-repo/semantics/publishedVersio

PortFIR – An integrated data provider as support for the food policy-makers

Introduction: Portuguese Food Composition Table (TCA) is managed by the National Institute of Health Doutor Ricardo Jorge (INSA) and is publicly available on the Portuguese Food Information Resource (PortFIR) platform. PortFIR, besides food composition data, was designed to include data on food contamination and food consumption, in order to provide national data easily available in one platform. Objective:To compile and make widely available food-related data (food composition, food safety and food consumption), while providing science-based information, to support food policy-makers.info:eu-repo/semantics/publishedVersio

Food Composition Table user’s utilization and needs PortFIR assessment

Food composition tables (FCT) and databases (FCDB) are very important data resources that can contribute to the achievement of health gains through the improvement of knowledge and nutritional status of the population and the promotion of healthy eating, however they are far from complete. Therefore, a continuous development and update of these resources, with great focus in their user’s needs, should be considered a priority. Objectives: To identify and assess the type of utilization and needs of the Portuguese FCT/FCDB (TCA) user’s, in order to define priorities for its development and update.info:eu-repo/semantics/publishedVersio

Availability and information needs in the chemical contaminants domain – PortFIR assessment

Chemical contaminants (Chc) can be naturally present and/or be introduced in food and feed as result of the various stages of its production, processing and transport and/or due to environmental contamination. The analysis of Chc laboratory data allows to generate information for continuous improvement of food safety and protection of public health. In order to define priorities for development of the Contaminants Database of the Portuguese Food Information Resource (PortFIR), it was decided to identify and assess the availability and information needs on food and feed Chc of the main Portuguese stakeholders in the area.N/

Comunicação nas organizações e tácticas de socialização : o caso dos estagiários de jornalismo televisivo

Orientação: Jorge Correia Jesuíno ; co-orientação: Fernando CorreiaA presente investigação trata um tema muito discutido hoje em dia nos meios da comunicação social em Portugal, mas que se relaciona com uma problemática mais ampla de comunicação nas organizações: a integração dos estagiários de jornalismo nas estruturas redactoriais. Vários autores como Sara Meireles Graça, Paulo Faustino e José Luís Garcia têm-se debruçado sobre o problema do “corrupio” de jornalistas estagiários nas redacções e sobre outro tema muito controverso, directamente relacionado, que é o “trabalho escravo” no jornalismo (Garcia et. al., 2009, p. 147). Pretendemos aprofundar estas questões, averiguando a sua dimensão e qual o interesse das empresas neste e noutros processos de recrutamento e integração organizacional, assim como o que pensam sobre tudo isto os estagiários e outros intervenientes. O estudo terá como objecto as três estações generalistas de televisão em Portugal. A pesquisa empírica desenvolveu-se nestas três estações de televisão que, salvaguardando as suas particularidades, foram tomadas como organizações-exemplo para a análise dos processos de integração e socialização organizacional. Realizámos um estudo longitudinal com base numa metodologia de cariz qualitativo a partir do olhar, nomeadamente, dos responsáveis pelos estágios nas redacções e dos estagiários, que são os principais atores neste processo. Os resultados apontam para a existência em algumas televisões, de estagiários curriculares a desempenhar funções como se de jornalistas profissionais se tratassem. Em relação a este tema, também existem divergências de opinião entre as entidades que regulam a profissão e as que representam as televisões. Quanto às tácticas de socialização, as televisões conseguem formar profissionais autónomos, apesar da existência de alguns casos de insatisfação e desinvestimento por parte de estagiários.This research addresses a topic that is much discussed in the media in Portugal nowadays, but is related to a wider issue of communication in organizations: the integration of trainee journalists in the newsrooms. Several authors, such as Sara Meireles Graça, Paulo Faustino and José Luís Garcia, have been addressing the problem of the «hustle» of trainee journalists in the newsrooms and about another very controversial topic, directly related, which is the "slave labour" in journalism (Garcia et. al., 2009, p. 147). We intend to explore these issues, by examining their extension and what’s the interest of the companies in this and other recruitment and organizational integration processes, as well as what the trainees and other stakeholders think about all this. The study will focus on the three generalist TV stations in Portugal. The empirical research was developed in these three tv stations which, safeguarding their particularities, were taken as model organizations for the analysis of integration processes and organizational socialization. We conducted a longitudinal study based on a methodology of a qualitative nature from the point of view, namely, of the responsible of the trainees in the newsrooms and the trainees, who are the main actors in this process. The results point to the existence in some televisions, of curriculum trainees performing functions as if they were professional journalists. About this issue, there are also diverging opinions among the entities that regulate the profession and those which represent the televisions. As for socialization tactics, televisions can form autonomous professionals, despite the existence of some cases of dissatisfaction and disinvestment by trainees

Physician burnout in primary care during the COVID-19 pandemic: a cross-sectional study in Portugal

Primary care physicians have been present on the frontline during the ongoing pandemic, adding new tasks to already high workloads. Our aim was to evaluate burnout in primary care physicians during the COVID-19 pandemic, as well as associated contributing factors. Cross-sectional study with an online questionnaire disseminated through social media, applying the snowball technique. The target population was primary care physicians working in Portugal during the first outbreak of the COVID-19 pandemic. In addition to sociodemographic data, the questionnaire collected responses to the Copenhagen Burnout Inventory (CBI), the Resilience Scale and the Depression, Anxiety, and Stress Scales (DASS-21). Data were collected from May 9 to June 8, 2020, a period comprising the declaration of a national calamity and then state of emergency, and the subsequent ease of lockdown measures. Levels of burnout in 3 different dimensions (personal, work, and patient-related), resilience, stress, depression, and anxiety were assessed. Logistic regression analyses were conducted to identify factors associated with burnout levels. Results: Among the 214 physician respondents, burnout levels were high in the 3 dimensions. A strong association was found between gender, years of professional experience, depression and anxiety, and burnout levels. Physician burnout in primary care is high and has increased during the pandemic. More studies are needed in the long term to provide a comprehensive assessment of COVID-19’simpact on burnout levels and how to best approach and mitigate it during such unprecedented times.info:eu-repo/semantics/publishedVersio

The new era in Retail: Retail 4.0 centered on the human being and its purchase process

In the face of the new "digital phenomenon", a more human-centric and personal-oriented era is predicted. Brands seek to create an emotional bond with the customer and provide an experience that unifies the online and offline world. It was verified that there is a reinforcement of the strategy established in Retail 3.0, continuing with the implementation of the omnichannel business model, but highlighting the consumer and his preferences. This is a very current subject and one that is still the target of many studies, since it is a recent phenomenon and still in application. So, this article allows us to understand the demands that drove the arrival of marketing and Retail 4.0 and what it entails, but that brings with it a central question: "why brands start their activity on the online channel instead of opting for the traditional channel? " It is therefore necessary to understand whether there is a kind of role reversal as to how some brands present themselves to their customers for the first time. If they begin to implement themselves, first, in the digital world, using it as their point of sale (POS), and only then think of integrating a physical store, or if they choose to unify the channels. It was once notable that brands presented themselves to their customers through a physical store and gradually implemented a multi-channel strategy to follow the change in consumer buying behavior, which over the years demonstrated a strong desire to introduce the new technologies in their day-to-day tasks. Nowadays, the reverse is true, that newly created brands even opt to make themselves known in the digital world, some of which later open a physical store or are implemented in multi-brand stores, while others keep only their point of virtual sales. This brings us to some minor issues: why do most brands nowadays start their activity on the online platform and do not follow the physical store? What is the key to success (for a brand to transition from online to offline)? When does a brand feel ready to move to an omnichanel strategy? What resources do they use to understand if the brand is ready for a new step? The objective would be to perceive this new panorama for the brands and that, in the end, it is possible to obtain a set of criteria that allow them to have a greater orientation on this subject.This work is financed by FEDER funds through the Competitivity Factors Operational Program - COMPETE and by national funds through FCT – Foundation for Science and Technology within the scope of the project POCI-01-0145-FEDER-00713