Investigation of the electrochemical behaviour of thermally prepared Pt-IrO2 electrodes

Different IrO2 electrodes in which the molar percentage of platinum (Pt) varies from 0 %mol Pt to 100 %mol Pt were prepared on titanium (Ti) substrate by thermal decomposition techniques. The electrodes were characterized physically (SEM, XPS) and electrochemically and then applied to methanol oxidation. The SEM micrographs indicated that the electrodes present different morphologies depending on the amount of platinum in the deposit and the cracks observed on the 0 %mol Pt electrode diminish in size tending to a compact and rough surface for 70 %mol Pt electrode. XPS results indicate good quality of the coating layer deposited on the titanium substrate. The voltammetric investigations in the supporting electrolyte indicate that the electrodes with low amount of platinum (less than 10 %mol Pt) behave as pure IrO2. But in the case of electrodes containing more than 40 %mol Pt, the voltammograms are like that of platinum. Electrocatalytic activity towards methanol oxidation was observed with the electrodes containing high amount of platinum. Its oxidation begins at a potential of about 210 mV lower on such electrodes than the pure platinum electrode (100 %mol Pt). But for electrode containing low quantity of Pt, the surface of the coating is essentially composed of IrO2 and methanol oxidation occurs in the domain of water decomposition solely. The increase of the electrocatalytic behaviour of the electrodes containing high amount of Pt towards methanol oxidation is due to the bifunctional behaviour of the electrodes. KEY WORDS: Iridium dioxide, Platinum, Methanol oxidation, Electrocatalytic activity  Bull. Chem. Soc. Ethiop. 2008, 22(1), 125-134

Corpus linguistics and metaoperational grammar to the teaching of grammatical cohesion

Abstract: Producing cohesive writing can be a difficult task if foreign language learners are not presented with the necessary analytic tools to fathom out the functioning of language. Studies show that cohesive writing is particularly difficult for non-native English speakers (E. Hinkel, 2001, 2002; J.M. Swales & C.B. Feak, 2004). And it is also proved that textual cohesion devices do not receive enough attention in traditional language teaching (G. Cook,1989 p.127). That is undoubtedly the reason why there is a shortage of teaching materials on cohesion (M. Johnson, 2017). Consequently, this analysis aims to propose an approach that can be helpful to English learners in their writing. It also ambitions to familiarize students and teachers with online corpora in addressing some linguistics facts. It draws on metaoperational grammar theory’s findings (H. Adamczewski, 1982, 1991; J-P. Gabilan, 2011; Y.K.J-F. Kpli, 2014). Utterances are extracted from online sources, like Corpus of Contemporary American English (COCA) and British National Corpus (BNC) in order to take advantage of this revolutionary approach to data collection (Corpus Linguistics), not yet widely applied in Côte d’Ivoire. It results from the analyses that metaoperational grammar theory and corpus linguistics can help students to produce cohesive writing in order to succeed in conveying their own ideas. Keywords: grammatical cohesion, metaoperational, grammar, corpus linguistic

Study of oxygen evolution reaction on thermally prepared xPtOy-(100-x)IrO2 electrodes

The mixed coupled xPtOy-(100-x)IrO2 electrodes (x = 0, 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100) were thermally prepared at 450 °C on titanium supports. The prepared electrodes were firstly physically characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Afterwards, electrochemical characteri­zations were performed by voltammetric (cyclic and linear) methods in different electrolyte media (KOH and HClO4). It is shown that the prepared electrodes are composed by both PtOy (platinum and platinum oxide) and IrO2 (iridium dioxide). For xPtOy-(100-x)IrO2 electrodes having higher content of IrO2, more surface cracks and pores are formed, defining a higher surface area with more active sites. Higher surface area due to presence of both PtOy and IrO2, is for xPtOy-(100-x)IrO2 electrodes in 1 M KOH solution confirmed by cyclic voltammetry at potentials of the oxide layer region. For all prepared electrodes, voltammetric charges were found higher than for PtOy, while the highest voltammetric charge is observed for the mixed 40PtOy-60IrO2 (x = 40) electrode. The Tafel slopes for oxygen evolution reaction (OER) in either basic (0.1 M KOH) or acid (0.1 M HClO4) media were determined from measured linear voltammograms corrected for the ohmic drop. The values of Tafel slopes for OER at PtOy, 90PtOy-10IrO2 and IrO2 in basic medium are 122, 55 and 40 mV dec-1, respectively. For other mixed electrodes, Tafel slopes of 40 mV dec-1 were obtained. Although proceeding by different OER mechanism, similar values of Tafel slopes were obtained in acid medium, i.e., Tafel slopes of 120, 60 and 39 mV dec-1 were obtained for PtOy, 90PtOy-10IrO2 and IrO2, and 40 mV dec-1 for other mixed electrodes. The analysis of Tafel slope values showed that OER is more rapid on coupled mixed electrodes than on pure PtOy. For mixed xPtOy-(100-x)IrO2 electrodes, OER is more rapid when the molar percent of PtOy meets the following condition: 0 ˂ x ≤ 80. This study also showed that the mixed coupled electrodes are more electro­cata­lytically active for OER than either PtOy or IrO2 in these two media. </p

Rebuilding the health care system in Afghanistan: an overview of primary care and emergency services

Developing nations have many challenges to the growth of emergency medical systems. This development in Afghanistan is also complicated by many factors that plague post-conflict countries including an unstable political system, poor economy, poor baseline health indices, and ongoing violence. Progress has been made in Afghanistan with the implementation of the Basic Package of Health Service (BPHS) by the Ministry of Public Health in an effort to provide healthcare that would have the most cost-effective impact on common health problems. Trauma and trauma-related disability were both identified as priorities under the BPHS, and efforts have begun to address these problems. Most of the emergency care delivered in Afghanistan is provided by the military sector and non-governmental organizations. Security, lack of infrastructure, economic hardship, difficult access to healthcare facilities, poor healthcare facility conditions, and lack of trained healthcare providers, especially women, are all problems that need to be addressed. The long-term goal of quality healthcare for all Afghan citizens will only be met by a combination of specific goal-oriented projects, foreign aid, domestic responsibility, and time

Medicamentos de dispensação excepcional: histórico e gastos do Ministério da Saúde do Brasil

OBJECTIVE: To describe the technical aspects of the Exceptional Circumstance Drug Dispensing Program of the Brazilian Ministry of Health, especially with respect to the cost of dispensed medication. METHODS: Technical information was obtained from the ordinances that regulate the Program. Expenditure from 2000 to 2007 was obtained from the Sistema Único de Saúde's (Unified Healthcare System) Outpatient Information System. All drugs dispensed between 1993 and 2009 and the amount and cost of each procedure were evaluated, based on information from the high-complexity procedure authorization of each of the country's states. RESULTS: The Program changed with the increase in the number of pharmacological agents and presentations distributed by, and the number of diseases contemplated in the program. In 1993, the program distributed 15 pharmacological agents in 31 distinct presentations. This number increased to 109 agents in 243 presentations in 2009. Total Ministry of Health expenditure with medications was R$1,410,181,600.74 in 2007, almost twice the amount spent in 2000, R$684,975,404.43. Diseases whose expenditure increased in the period included chronic renal insufficiency, transplantation, and hepatitis C. CONCLUSIONS: The Exceptional Circumstance Drug Dispensing Program is in constant transformation, aimed at building instruments and strategies that can ensure and expand access to medication among the population. Alternatives should be sought to decrease the financial impact of the Program to a level that does not impact other sectors of the health care system, given the high cost associated with novel interventions.OBJETIVO: Describir aspectos técnicos del Programa de Medicamentos de Dispensación en Carácter Excepcional del Ministerio de Salud de Brasil, especialmente con relación a los gastos con los medicamentos distribuidos. MÉTODOS: Los aspectos técnicos fueron obtenidos por medio de consulta a todas los reglamentos que rigen el Programa. Gastos en el período de 2000 a 2007 fueron obtenidos del Sistema de Informaciones Ambulatorias del Sistema Único de Salud. Se analizaron los medicamentos dispensados de 1993 a 2009, cantidades y valor de cada procedimiento, informado en las autorizaciones de procedimientos de alta complejidad para cada estado. RESULTADOS: El Programa cambió, con aumento del número de fármacos y presentaciones farmacéuticas distribuidas y de enfermedades contempladas. Eran distribuidos 15 fármacos en 31 diferentes presentaciones farmacéuticas en 1993, pasando para 109 fármacos en 243 presentaciones en 2009. Los gastos totales del Ministerio de Salud con medicamentos sumaron, en 2007, R$1.410.181.600,74, casi el doble del valor gastado en el año 2000: R$ 684.975.404,43. Algunas enfermedades que representaron mayor gastos en ese período fueron: insuficiencia renal crónica, trasplante y hepatitis C. CONCLUSIONES: El Programa de Medicamentos de Dispensación en Carácter Excepcional está en constante transformación, buscando mejorar los instrumentos y estrategias que aseguren y amplíen el acceso de la población a los medicamentos. Se deben buscar alternativas para reducir el impacto financiero del Programa para que no exista prejuicio hacia las otras áreas del sistema de salud, dado el costo elevado de las nuevas tecnologías.OBJETIVO: Descrever aspectos técnicos do Programa de Medicamentos de Dispensação em Caráter Excepcional do Ministério de Saúde do Brasil, especialmente em relação aos gastos com os medicamentos distribuídos. MÉTODOS: Os aspectos técnicos foram obtidos por meio de consulta a todas as portarias que regulamentaram o Programa. Gastos no período de 2000 a 2007 foram obtidos do Sistema de Informações Ambulatoriais do Sistema Único de Saúde. Foram analisados os medicamentos dispensados de 1993 a 2009, quantidades e valor de cada procedimento informados nas autorizações de procedimentos de alta complexidade para cada estado. RESULTADOS: O Programa mudou, com aumento do número de fármacos e apresentações farmacêuticas distribuídas e de doenças contempladas. Eram distribuídos 15 fármacos em 31 diferentes apresentações farmacêuticas em 1993, passando para 109 fármacos em 243 apresentações em 2009. Os gastos totais do Ministério da Saúde com medicamentos somaram, em 2007, R$1.410.181.600,74, quase o dobro do valor gasto em 2000: R$ 684.975.404,43. Algumas das doenças que representaram maiores gastos nesse período foram: insuficiência renal crônica, transplante e hepatite C. CONCLUSÕES: O Programa de Medicamentos de Dispensação em Caráter Excepcional está em constante transformação, visando aprimorar os instrumentos e estratégias que assegurem e ampliem o acesso da população aos medicamentos. Devem-se buscar alternativas para reduzir o impacto financeiro do Programa para que não haja prejuízos às outras áreas do sistema de saúde, dado o custo elevado das novas tecnologias.Universidade Federal de São Paulo (UNIFESP) Centro Paulista de Economia da SaúdeMinistério da SaúdeUNIFESP, Centro Paulista de Economia da SaúdeSciEL

The New International Health Regulations and the Federalism Dilemma

The recent revision of the International Health Regulations, say Wilson and colleagues, is both long overdue and eminently necessary to face the challenges of an increasingly globalized world

SARS Coronavirus Detection

We developed a set of three real-time reverse transcription–polymerase chain reaction (PCR) assays that amplify three different regions of the SARS-associated coronavirus (SARS-CoV), can be run in parallel or in a single tube, and can detect <10 genome equivalents of SARS-CoV. The assays consider all currently available SARS-CoV sequences and are optimized for two prominent real-time PCR platforms

Herbal medicine: women's views, knowledge and interaction with doctors: a qualitative study

BACKGROUND: There is growing concern that serious interactions are occurring between prescribed/over the counter and herbal medicines and that there is a lack of disclosure of herbal use by patients to doctors. This study explores women's perspectives about the safety of herbal remedies, herb-drug interactions and communication with doctors about herbal medicines. METHODS: Qualitative, cross-sectional study, with purposive sampling which took place in Cheshire, UK. Eighteen in depth semi-structured interviews were conducted with female herbal medicine users aged 18 years and above. RESULTS: The large majority did not inform their GPs of their use of herbal medicines. This was due to lack of physician enquiry, perception of importance and fear of a negative response. Several women were not aware that herbal remedies could interact with prescribed or over the counter medicines. Of the women who had experienced adverse effects none had reported them, believing them of low importance. CONCLUSION: The women had little knowledge about herb-drug interactions and rarely disclosed use of herbal medicines to their doctor. Doctors' communication and openness regarding herbal medicines needs to improve and there should be increased access to accurate information on herbal medicines in the public and health care domain