The photochemistry and photophysics of a series of alpha octa(alkyl-substituted) silicon, zinc and palladium phthalocyanines

Photophysical and photochemical measurements have been made on a series of novel alpha octa(alkyl-substituted) silicon, zinc and palladium phthalocyanines for which the synthesis is outlined. Fluorescence quantum yields and lifetimes, triplet quantum yields and lifetimes and singlet delta oxygen quantum yields were measured in 1% v/v pyridine in toluene. The effects of varying central atom and addition of alkyl substituents relative to unsubstituted parent molecules, zinc phthalocyanine (ZnPc) and silicon phthalocyanine (SiPc), are discussed. All phthalocyanines studied exhibit absorption and emission maxima in the region of 680–750 nm with molar absorptivity of the Q-band 105 M−1 cm−1. The series of compounds also exhibited triplet quantum yields of 0.65–0.95 and singlet oxygen quantum yields of 0.49–0.93

Motivação dos alunos por encontrar?: aliança tripartida: design-based research, tecnologia e aprendizagem da língua estrangeira

CNaPPES 2018. 5º Congresso Nacional de Práticas Pedagógicas no Ensino Superior. Braga, Portugal, 12 e 13 de julho de 2018.Entre as práticas mais importantes na educação aparece uma que permite aprofundar a nossa reflexão e o desenhar de atividades pedagógicas na a ́rea das línguas estrangeiras: desencadear a motivação dos aprendentes para a aprendizagem.info:eu-repo/semantics/publishedVersio

An ecologically intensive approach for the design of sustainable horticultural systems in the tropics

Fruit and vegetable growers in the tropics are faced with crop protection issues resulting in food insecurity and low-income in low-input traditional agro-systems. In intensive systems, pesticide-induced adverse impacts on human health and the environment may occur. Setting up an "ecologically intensive" horticulture by modifying agro-systems to mobilize natural regulation mechanisms taking ecological processes as a source of inspiration, has become a major challenge. This implies a shift from a "tactical" approach based on preventive and curative chemical treatments (agro-chemistry) to a "strategic" approach based on preventive and natural methods (agro-ecology) for the regulation of pests/pathogens infestations/infections. Horticultural cropping systems provide ideal frameworks for studying the effects of the planned introduction and management of plant species diversity (PSD), on pest and disease impact. The Cirad Omega3 Project builds on case studies representing a broad range of PSD levels, scales and deployment modalities, according to an a priori typology of pests and diseases based on their life-history traits. Obtained and anticipated outcomes of these studies concern both i) knowledge on ecological pest and disease regulation processes that can be mobilized in horticultural systems, ii) tools and methods for incepting and evaluating innovating pest and disease-resilient cropping systems. We present here the global approach and first results obtained within this framework regarding i) introduction of service plants with sanitizing/ allelopathic effect managed as green manure for reducing tomato bacterial wilt caused by Ralstonia solanacearum, ii) potential of trap crops/barriers for reducing infestation and damage of tomato fruit worms Helicoverpa armigera on okra in Niger and Helicoverpa zea on tomato in Martinique. Results of these case studies on non-specific disease and pests with respectively low and high dispersal ability, provide decision rules which help set up models to predict the impact of PSD deployment modes on the studied bio-aggressors or other pathogens/pests with similar life-history traits. (Résumé d'auteur

Design-based research: desafios nos contextos escolares

Comunicação apresentada ao 5º Congresso Ibero-Americano em Investigação Qualitativa (CIAIQ2016), realizado na Universidade Lusófona do Porto em 2016Este artigo tem por objetivos explicitar a fundamentação teórica da abordagem metodológica do Design-Based Research, destacar as principais características, as vantagens, desvantagens da abordagem para responder aos desafios nos contextos escolares, com destaque para a integração de tecnologias. Apresenta as fases de organização do Design-Based Research e os ciclos iterativos em uma investigação, sobre formação de professores para integrar Recursos Educacionais Abertos nas práticas pedagógicas. Os aspectos pesquisados e as fases da investigação realizadas evidenciam o potencial da DBR para desenvolver pesquisas nos contextos escolares, em colaboração com os participantes sobre a integração de tecnologias e novos recursos educacionais nas práticas pedagógicas.This article aims to explain the theoretical basis of the methodological approach Design-Based Research, to highlight the main features, advantages, disadvantages of the approach trying to answer the challenges in school contexts, highlighting integration technologies. We also present the stages of organization of the Design-Based Research and iterative cycles in an investigation on teacher training to integrate Open Educational Resources in pedagogical practices. The aspects investigated and the research phases performed show the potential of DBR to develop research in the school context, in collaboration with the participants on the integration of technology and new educational resources in pedagogical practices.info:eu-repo/semantics/publishedVersio

New application of density fractionation: assessing trace element/soil matrix associations within organic waste-amended agricultural soils

Zinc (Zn) is a trace element (TE) that occurs naturally in soils, however spreading Zn-rich organic waste (OW) on farmlands may lead to hazardous Zn levels. Common problems are related to phytotoxicity, introduction into the food chain and groundwater contamination. Assessing the associations between OW-borne Zn and the soil matrix is paramount to predict its short- and long-term behavior in the environment. This is usually pursued by using either single/sequential extractions (SSE) or spectroscopic methods such as XAS. Nevertheless, SSE reflects element extractability rather than the nature of its interactions with bearing phases, while XAS requires synchrotron radiation sources that are not available in certain regions of the world. We applied a third approach in this study – namely soil density fractionation – to isolate and characterize the constituents of the soil matrix (i.e. potential Zn bearing phases) and thereafter identify their associations with natural and OW-borne Zn. The target density fractions were the following: 2.7 g cm-3, plus an extractable fraction. The soil analyzed was a clayey Hapludox soil that received controlled pig slurry applications over 11 years, causing a 2-fold increase in Zn concentration within the surface layer: from 105.8 mg kg-1 of Zn (control soil) to 206.6 mg kg-1 of Zn (amended soil). Among the six selected density fractions, two of them were the most contrasting and representative. (I) The light fraction (<1.9 g cm-3) contained high OM concentration but accounted for only ~5% of the bulk soil mass. (II) The mineral-rich fraction (2.5–2.7 g cm-3) contained mainly quartz, kaolinite, vermiculite, a small amount of hematite and accounted for ~80% of the soil mass. In the control soil (no pig slurry application), 79.7% of the Zn was found in the mineral-rich 2.5–2.7 g cm-3 fraction. In the soil amended with pig slurry, the proportion of Zn found in the 2.5–2.7 g cm-3 fraction decreased to 57.3%, as Zn was also found in the OMrich <1.9 g cm-3 fraction (13.2%) and in the extractable fraction (16.6%). Other fractions were less representative in both soils (control and amended). The extractable, <1.9 g cm-3 and 2.5– 2.7 g cm-3 fractions accounted for roughly 1/3 each of the OW-borne Zn fate in the amended soil. Finally, these results were compared with data we previously reported for the same field experiment using well-stablished SSE and XAS techniques. Density fractionation not only agreed but also complemented the understanding of previous observations. This work demonstrates that density fractionation may be used as either main or complementary approach for assessing the biogeochemistry of TE such as Zn in the context of OW recycling in agricultural soils

Perception of family support among low-income elderly and associated factors

This study aims to identify the perception of family support among low-income elderly and associated factors. It is cross- sectional study with a sample of 235 elderly residents of Jequié, Bahia, Brazil. The instrument consisted of: demographics and health; Mini-Mental State Examination, Barthel Index, and Perceived Family Support Inventory. Statistical analysis was performed with a p<0.05 level of significance, upon completion of the Chi-Square. There was a statistically significant difference between the averages for Consistency-affection domain and presence of consequences variables (p=0.042) and impairment of basic daily living activities (p=0.033); and between Family-adaptation domain averages and illiterate education levels (p=0.012); and between the Autonomy domain and married state variables (p=0.013), completion of treatment (p=0.032), and impairment of basic daily living activities (p=0.011). Thus, it is evident that most seniors tested showed impaired perception of family support

Avaliação de saúde e da dor no pós-operatório de idosos submetidos à cirurgia cardíaca

O presente estudo teve por objetivo avaliar a saúde e a dor em idosos com insuficiência coronariana submetidos à cirurgia cardíaca. Trata-se de uma pesquisa de caráter analítico, prospectivo, com delineamento transversal e abordagem quantitativa. Os dados foram coletados a partir de uma ficha de avaliação fisioterapêutica e da escala numérica de dor, junto a 70 idosos submetidos à cirurgia cardíaca, em dois hospitais do município de Natal-RN. A faixa etária mais frequente foi de 60 a 69 anos (61,43%), seguida do sexo masculino (62,86%). Em relação às condições de saúde, 61,43% dos idosos apresentavam patologias pré-existentes, sendo a de maior distribuição, a Hipertensão Arterial Sistêmica (31,40%). O comportamento doloroso foi moderado no 1° e 3° e leve no 2° e 4° dias de pós- operatório. Desta forma, constatou-se que a maioria dos idosos submetidos à cirurgia cardíaca era do sexo masculino, que apresentava patologias pré-existentes, sendo a hipertensão, a patologia mais frequente, e com intensidade dolorosa predominantemente moderada

Caracterización de las personas con úlcera venosa en Brasil y Portugal: estudio comparativo

Objective: To compare the socio-demographic aspects, of health, care and clinic of people with venous ulcer (VU) in Brazil and Portugal. Method: Analytical comparative and transversal study with a quantitative approach. The sample was composed by 130 persons with UV assisted in Natal/Brazil and Évora/Portugal in the period between June and October of 2011, through a structured interview form and collection of bio-physiological measures. Results: Significant differences between the two countries were verified, regarding the age, family income, profession/occupation, time of lesion shorter than 6 months, small lesion area, ulcer with granulation, availability of proper products, place for treatment, access to medics, Doppler examination and documentation of clinical sate. Conclusion: The researched in Portugal were elder, with better income; the number of patients with a profession/occupation was lower than the researched users in Brazil and presented lesions with more favourable characteristics to the scar healing process. The researched assistance to users with VU in Portugal has presented to be significantly better than the one performed in Brazil

Quality of life for venous ulcer patients: a comparative study in Brazil/Portugal

Introduction: Venous ulcers are a public health problem that affect quality of life (QOL) and are determined by socioeconomic context, health assistance and lesion characteristics. Aim: To compare the QOL of patients suffering from venous ulcers in Natal/Brazil with patients in Evora/ Portugal. Method: Comparative and quantitative research involving 170 individuals suffering from venous ulcers, using the SF-36 instrument. Results: In Portugal, all dominion and dimension averages were higher than in Brazil, especially regarding social aspects (70.62). There were also a larger number of people with positive treatment characteristics. As for the lesion characteristics, these affected QOL dominions and dimensions in both countries. Discussion: The socioeconomic reality in Portugal is different from that in Brazil; the former has a larger variety and quantity of material resources available for lesion treatment. Conclusion: QOL in Portugal is better than in Brazil in terms of the aspects under consideration in this research