Highlights on Gold TADF complexes

AEI/FEDER, UE Project CTQ2016-76120-P Project PTDC/QUI-QFI/32007/2017Thermally activated delayed fluorescence (TADF) and TADF-organic light-emitting diodes (OLEDs) systems are being given increasing attention in research nowadays. Much more work has been done for organic-based materials in this field, but the use of TADF organometallic systems has also emerged in recent years. In particular, TADF-based gold compounds have not been particularly well-explored, with a higher number of examples of Au(I)-molecules and fewer for the higher oxidation state Au(III) derivatives. Nevertheless, the novelty and observed results deserve attention. A careful analysis has been performed in this review by classifying the reported compounds into two different groups regarding the oxidation state of the metal, and within each group, the ancillary ligands. Specific examples to illustrate their potential applications are included in the different section.publishersversionpublishe

Supramolecular Gold Metallogelators: The Key Role of Metallophilic Interactions

Gold metallogelators is an emerging area of research. The number of results published in the literature is still scarce. The majority of these gels is observed in organic solvents, and the potential applications are still to be explored. In this work, we present an overview about gold metallogelators divided in two different groups depending on the type of solvent used in the gelation process (organogelators and hydrogelators). A careful analysis of the data shows that aurophilic interactions are a common motif directly involved in gelation involving Au(I) complexes. There are also some Au(III) derivatives able to produce gels but in this case the organic ligands determine the aggregation process. A last section is included about the potential applications that have been reported until now with this new and amazing class of supramolecular assemblies

Biomass residues for energy production and habitat preservation. Case study in a montado area in Southwestern Europe

The use of forest and agricultural residues for energy production presents multiple benefits, but the link between bioenergy and the environment is complex and not all of the energetic options have the same impacts. This work evaluates the net positive effect of valorizing residual biomass in the context of a rural area of Portugal, Estremoz. It focuses on the combined assessment of biomass availability, techno-economic feasibility and environmental aspects of utilizing forest and agricultural residues to produce bioheat. At first, the energy potential of the residual biomass available in the municipality is evaluated using a geographical information system database. The assessment with RETScreen of the techno-economic feasibility of replacing electricity by biomass for heating local public schools follows. The results show that around 27 314 t of residues, corresponding to about 267 680 GJ, are produced each year in Estremoz, more than half in montado areas. The use of this biomass for the replacement of the existing electric heating systems of nine local schools by biomass-based ones offers good project profitability. As far as the environment is concerned, the energetic valorization of the residual biomass in Estremoz has multiple benefits. It contributes to climate change mitigation by saving greenhouse gas emissions and promoting the preservation of the traditional extensive uses of the ecosystems. Moreover, a correct vegetation management decreases the fire risk, potentiates the increase in biodiversity, offers better conditions for native species and allows to maintain the ecosystems

Highlights on gold TADF complexes

Thermally activated delayed fluorescence (TADF) and TADF-organic light-emitting diodes (OLEDs) systems are being given increasing attention in research nowadays. Much more work has been done for organic-based materials in this field, but the use of TADF organometallic systems has also emerged in recent years. In particular, TADF-based gold compounds have not been particularly well-explored, with a higher number of examples of Au(I)-molecules and fewer for the higher oxidation state Au(III) derivatives. Nevertheless, the novelty and observed results deserve attention. A careful analysis has been performed in this review by classifying the reported compounds into two different groups regarding the oxidation state of the metal, and within each group, the ancillary ligands. Specific examples to illustrate their potential applications are included in the different sections

Divulgação do património geológico da ilha de Santa Maria

XIV Expedição Científica do Departamento de Biologia - Santa Maria 2009.As ilhas dos Açores apresentam uma grande variedade de rochas, formas, estruturas e paisagens, que derivam, entre outros factores, da natureza dos magmas, do tipo de vulcanismo, dos condicionalismos geotectónicos intrínsecos à sua génese e em especial do seu posicionamento no Atlântico Norte, na junção tripla das placas litosféricas Euroasiática, Norte Americana e Africana (ou Núbia). Das nove ilhas que constituem o Arquipélago dos Açores, Santa Maria é a ilha mais Oriental e Meridional do território insular. [...]. Santa Maria distingue-se das restantes ilhas açorianas pelas suas características edafo-climáticas, geológicas e morfológicas. A história geológica desta ilha traduz-se numa intensa actividade vulcânica, que terá feito emergir a mesma há cerca de 10 milhões de anos, alternada com períodos de acalmia, oscilações do nível do mar concomitantes e episódios de intensa erosão. Em consequência, a ilha, que contém as formações geológicas mais antigas do arquipélago, possui actualmente formas vulcânicas muito alteradas e índices de erosão superiores aos das outras ilhas do arquipélago, apresenta significativos afloramentos de rochas sedimentares com conteúdo fóssil abundante e diversificado e expõe abundantes afloramentos de lavas submarinas (Nunes et al., 2007). Em suma: a sua localização geográfica, clima, actividade vulcânica e oscilações do nível do mar que a afectaram contribuíram, indubitavelmente, para a sua evolução e a geodiversidade que evidencia

A Manutenção dos Equipamentos Científicos da Universidade de Brasília

Neste artigo busca-se apresentar os aspectos da manutenção dos equipamentos científicos da Universidade de Brasília UnB numa reflexão orientada a outras universidades brasileiras para acordarem para a idéia de que não basta o investimento na implementação do seu parque científico ou tecnológico, sendo fundamental que o tempo de utilização de todo o sistema seja o maior possível ao longo da vida útil. Na aquisição dos equipamentos e instalações são ponderados os aspectos de custos de investimento, mas são negligenciados aspectos importantes para a manutenção, que dificultam os procedimentos em caso de defeito, cometendo-se o erro de não verificar a existência de meios humanos e materiais para a manutenção dos equipamentos. Fundamentada nos conceitos de manutenção, corretiva, preventiva, preditiva, produtiva total e centrada na confiabilidade, a pesquisa aborda, numa fase documental, os registros das ocorrências de manutenção entre os anos de 2003 e 2006, enfatizando as vantagens da manutenção preventiva planejada contra as ações corretivas e a importância que o usuário considera em relação ao tempo de resposta e ao tempo total nas intervenções. Confrontando, também, com uma pesquisa de campo que revela o nível de satisfação do serviço prestado pelo Centro de Manutenção de Equipamentos Científicos da UnB. Busca-se por fim, um grau de confiabilidade que deve partir do princípio de que a manutenção se inicia na especificação do bem, no qual são considerados os aspectos que facilitam os procedimentos da manutenção

Monitoring of the visitors impact at “Ponta da Ferraria e Pico das Camarinhas” geosite (São Miguel Island, Azores UNESCO Global Geopark, Portugal)

"Ponta da Ferraria e Pico das Camarinhas" is a protected geosite in São Miguel Island in the Azores archipelago, Portugal. Due to its importance for the geoconservation strategy of the Azores UNESCO Global Geopark, monitoring actions of visitor impact were implemented in order to assure that the main geological features of this geosite continue to be in a favourable status of conservation, taking into account present public use. Different types of data were collected over a one-year period aiming at the identification of factors that may affect the geosite and also the assessment of the eventual decrease of relevance that this geosite has experienced throughout that period. Among the many geological features that occur in the geosite, the littoral cone (or pseudocrater) was considered the most threatened due to its uniqueness and high vulnerability. The number of visitors was also analysed with respect to the geosite’s carrying capacity. The monitoring of this geosite allowed the definition of practical actions, in par- ticular to be addressed to the governmental agency who is responsible for the management of this geosite.This work is co-funded by the European Union through the European Regional Development Fund based on COMPETE 2020 (Programa Operacional da Competitividade e Internacionalização),project ICT(UID/GEO/04683/2013) with reference POCI-01-0145-FEDER-007690 and national funds provided by Fundação para a Ciência e Tecnologia. We also thank the Azores Geopark management body and staff for the support to the master thesis attheaimofwhichthismonitoringwascarriedout.Authorsexpresstheir gratitude for the comments made by Dr. Juana Vegas and by an anonymous reviewer, who contributed to improve the final quality of the manuscript.info:eu-repo/semantics/publishedVersio

Selective Recognition of Amino Acids and Peptides by Small Supramolecular Receptors

UIDB/50006/2020To this day, the recognition and high affinity binding of biomolecules in water by synthetic receptors remains challenging, while the necessity for systems for their sensing, transport and modulation persists. This problematic is prevalent for the recognition of peptides, which not only have key roles in many biochemical pathways, as well as having pharmacological and biotechnological applications, but also frequently serve as models for the study of proteins. Taking inspiration in nature and on the interactions that occur between several receptors and peptide sequences, many researchers have developed and applied a variety of different synthetic receptors, as is the case of macrocyclic compounds, molecular imprinted polymers, organometallic cages, among others, to bind amino acids, small peptides and proteins. In this critical review, we present and discuss selected examples of synthetic receptors for amino acids and peptides, with a greater focus on supramolecular receptors, which show great promise for the selective recognition of these biomolecules in physiological conditions. We decided to focus preferentially on small synthetic receptors (leaving out of this review high molecular weight polymeric systems) for which more detailed and accurate molecular level information regarding the main structural and thermodynamic features of the receptor biomolecule assemblies is available.publishersversionpublishe

Aplicação da metodologia da análise e solução de problemas em um serviço de entrega de cartões bancários : um estudo de caso

The Islamic financial market has been gaining more and more space in the economies of emerging countries, especially in Southeast Asian countries, having as influence of this growth, factors such as growing wealth in predominantly Muslim countries and growing awareness of Sharia, as is the case of Brunei Darussalam, a predominantly Muslim power in Southeast Asia. Such growth generated an increase in the demand for services related to this segment, and for this reason the company under study, responsible for the delivery of bank cards of a financial institution compatible with sharia, began to face problems in meeting this demand. In view of this, the present work aimed to identify the deficiencies in the bank card delivery service, the proposition and implementation of improvements and the standardization of its processes through the application of the MASP. The research was characterized as a descriptiveexploratory case study, with qualitative-quantitative data analysis. The development of the methodology was adequate to the situation, since it allowed that existing problems in the process were identified, analyzed and solved in a systemic way, thus providing a significant gain in the rates of cards successfully delivered.O mercado financeiro islâmico vem ganhando cada vez mais espaço na economia de países emergentes, principalmente de países do sudeste asiático, tendo como influência desse crescimento, fatores como a crescente riqueza em países predominante muçulmanos e a crescente conscientização sobre os modos de financiamento compatíveis com a sharia, como é o caso de Brunei Darussalam, potência de predominância muçulmana do Sudeste Asiático. Tal crescimento gerou um aumento nas demandas de serviços relacionados a esse segmento, e por esse motivo a empresa objeto de estudo, responsável pela entrega de cartões bancários de uma instituição financeira compatível com a sharia, passou a enfrentar problemas em atender à essa demanda. Diante disso, o presente trabalhou objetivou por meio da aplicação da metodologia de análise e solução de problemas a identificação de deficiências existentes no serviço de entrega dos cartões bancários, a proposição e implementação de melhorias e a padronização de seus processos. A pesquisa caracterizou-se como um estudo de caso descritivo-exploratório, com análise quali-quantitativa dos dados. O desenvolvimento da metodologia de análise e solução de problemas se mostrou adequada a situação, pois possibilitou que problemas existentes no processo fossem identificados, analisados e solucionados de forma sistêmica, proporcionando assim um ganho significativo nos índices de cartões entregues com sucesso