Incorporação de resíduos de cerâmica em argamassas de cal aérea

Sabe-se que aproximadamente 30% do material produzido pela indústria cerâmica é considerado desperdício e, frequentemente, depositado em aterro, com o impacto ambiental negativo que acarreta. Esta tem sido uma das grandes motivações para a crescente investigação que tem sido levada a cabo a fim de obter soluções viáveis para a sua reintrodução no processo produtivo. A viabilidade do uso de resíduos de material cerâmico tem vindo a ser avaliada, principalmente, na incorporação em betões ou em argamassas com base em cimento. Na antiguidade e na ausência de pozolanas naturais, eram frequentemente utilizados resíduos cerâmicos moídos, atuando como pozolanas artificiais e conferindo algumas características hidráulicas e de durabilidade às argamassas de cal aérea. Temse efetivamente constatado que alguns pós resultantes de desperdícios de cerâmica de barro vermelho, nomeadamente os que foram sujeitos a tratamento térmico a temperaturas inferiores a 900°C e moídos em granulometria fina, podem funcionar como pozolanas artificiais em argamassas. A introdução de resíduos de cerâmica em granulometria mais grossa nas argamassas, como agregado, pode também revelarse vantajoso, na medida em que permite substituir parcialmente a areia normalmente utilizada. Assim sendo, o recurso aos resíduos de cerâmica pode ser muito vantajoso em três vertentes principais: a redução de resíduos a depositar em aterro, a redução da extração de rochas para serem utilizadas na produção de ligantes e de areias e a produção de argamassas com comportamentos melhorados. Com o objetivo de analisar a viabilidade da introdução de resíduos de cerâmica em argamassas, que se pretendem sejam, essencialmente, adequadas como argamassas de substituição, tem vindo a ser desenvolvida investigação na Universidade de Coimbra em colaboração com a Universidade Nova de Lisboa. O trabalho que se apresenta neste artigo é uma pequena parte dessa investigação. Toda esta investigação tem tido o apoio de um projeto de investigação financiado pela FCT.

Beriberi epidemic within rural Muslin fishing communities in Guiné - Bissau

Beriberi, ou cardiopatia e polineuropatia ligada à deficiência de tiamina, foi, antigamente, um flagelo nas populações. Os mais notáveis surtos de beriberi ocorreram após o advento da moagem de massa de arroz, em várias zonas da Ásia, no final do século XIX. Com a descoberta de vitamina B1, "anti-beriberi", e, subsequentemente, o enriquecimento de alimentos e as campanhas de sensibilização de saúde pública, a doença foi esquecida por muitos profissionais de saúde. Contudo, sabe-se que, hoje em dia, em diferentes partes do mundo, muitos casos de beriberi são os focos primários de epidemias de outras deficiências potencialmentes fatais, em comunidades vulneráveis. Determinados alimentos, assim como o álcool, são conhecidos para reduzir a absorção de vitamina B1. A Encefalopatia de Wernicke, a deficiência de tiamina mais conhecida pelos médicos que trabalham em países desenvolvidos, está associada à ingestão de álcool. Estudos recentes demonstraram, por um lado, atrasos significativos do desenvolvimento neurolinguístico em crianças alimentadas com leite sem tiamina, assim como uma possível correlação entre malária grave e deficiencia em Vitamina B1, o que reforça a importância desta vitamina na saúde das populações. A Guiné-Bissau, um país fragilizado pelos conflitos coloniais e pós-coloniais, instabilidade política, tráfico de droga e deficiente acesso à Saúde, continua sendo um dos países mais pobres do mundo. A maioria da população vive da agricultura de subsistência, pesca e colheita de cajú. O Islão é practicado por quase metade da população, e as religiões animistas e cristãs compõem as outras religiões principais do país. De acordo com a fé islâmica, os muçulmanos da Guiné-Bissau praticam o jejum, em função da luz do dia, durante o mês de Ramadão. Existe pouca investigação publicada sobre os efeitos nutricionais e na saúde deste ritual. Este trabalho é o primeiro a relacionar uma deficiência de micronutrientes ao mês sagrado do Ramadão. Esta tese apresenta casos clínicos de beriberi em comunidades rurais muçulmanas, que ocorreram no final da época das chuvas, que coincide com o mês de Ramadão. A análise dos dados mostra que, uma vez que alguns dos doentes apresentavam os mesmos sintomas, repetidamente, todos os anos, estes casos podem refletir a ponta do iceberg da ocorrência de beriberi na Guiné-Bissau. Parte da discussão centra-se na necessidade de mais investigação para confirmar o grau de deficiência na população em geral, efeitos de deficiência de tiamina relacionados com a malária, e consequências possíveis da deficiência marginal, a longo prazo, desta vitamina na saúde. A discussão apresenta ainda sugestões práticas para a redução da incidência da deficiência de vitamina B1 na Guiné-Bissau.

Epidemiological study on leishmaniasis in an area of environmental tourism and ecotourism, State of Mato Grosso do Sul, 2006-2007

The aims of this study were to carry out a serological survey of canine leishmaniasis and identify the phlebotomine fauna in the urban area of Bonito, Mato Grosso do Sul. The serological survey was conducted on a sample of 303 dogs, by means of the indirect immunofluorescence test. Phlebotomines were captured using automated light traps. The serological survey found that 30% of the dogs were seropositive, both from the center and from all districts of the town. A total of 2,772 specimens of phlebotomines were caught and the species most found was Lutzomyia longipalpis (90.4%), which corroborated its role as the vector of for canine visceral leishmaniasis in the region. Phlebotomines of the species Bichromomyia flaviscutellata (the main vector for Leishmania (Leishmania) amazonensis) and Nyssomyia whitmani (the vector for Leishmania (Viannia) brasiliensis) were also caught. The findings indicate the need for continuous epidemiological surveillance, with attention towards diminishing the vector breeding sites and the transmission of these diseases in that region.

Epidemiological pattern of leprosy in an endemic area of North-East Brazil, 1996-2005: the supporting role of a Nongovernmental Organization

In an endemic area of North-East Brazil (the town of Picos, State of Piauí), a nongovernmental organization (NGO) supported the activity against leprosy in connection with governmental health organizations and local agents. The indicators of leprosy elimination were compared over time (within Picos) and across space (Picos versus Piauí). The case detection rate, above 8 per 10,000 people in the last two years of observation, increased over time in Picos (p=0.010). This finding could be due to active detection activities rather than expanding endemicity, as suggested by the reduction in leprosy in children (p=0.053) and the decrease in the proportion of new cases with grade 2 disability (p<0.001). These indicators showed a more favorable time trend in the city than in the State, suggesting that NGO activity was supportive in the battle towards leprosy control.

Comparison between clinical and ultrasonographic findings in cases of periportal fibrosis in an endemic area for schistosomiasis mansoni in Brazil

INTRODUCTION: Abdominal palpation and ultrasound findings among patients from an endemic area for schistosomiasis in Brazil who had been followed up for 27 years were compared. METHODS: In 2004, 411 patients from Brejo do Espírito Santo, in the State of Bahia, were selected for the present investigation after giving their written informed consent. Based on clinical data, they were divided into three groups: 41 patients with evidence of liver fibrosis in 2004 (Group 1); 102 patients with evidence of liver fibrosis in the past (1976-1989) but not in 2004 (Group 2); and 268 patients without evidence of liver fibrosis at any time during the 27-year follow-up (Group 3). All of the patients underwent abdominal ultrasound in which the examiner did not know the result from the clinical examination. The data were stored in a database. RESULTS: The prevalence of periportal fibrosis on ultrasound was 82.9%, 56.9% and 13.4% in Groups 1, 2 and 3, respectively. In the presence of hard, nodular liver or prominent left lobe and a hard palpable spleen, ultrasound revealed periportal fibrosis in 70.9%. However, periportal fibrosis was diagnosed using ultrasound in 25.4% of the patients in the absence of clinical evidence of liver involvement. Thus, ultrasound diagnosed periportal fibrosis 3.1 times more frequently than clinical examination did. CONCLUSIONS: Although clinical examination is important in evaluating morbidity due to Manson's schistosomiasis in endemic areas, ultrasound is more accurate in diagnosing liver involvement and periportal fibrosis.

Seroprevalence and risk factors for canine visceral leishmaniasis in the endemic area of Dias D'Ávila, State of Bahia, Brazil

INTRODUCTION: Visceral leishmaniasis (VL) is an important zoonosis in relation to public health systems. Dogs are the main domestic reservoir. This study aimed to investigate occurrences of canine VL in Dias D'Ávila, State of Bahia, Brazil. METHODS: The prevalence was evaluated by means of clinical and laboratory tests on a population of 312 domestic dogs from 23 localities in this municipality, using indirect immunofluorescence and immunoenzymatic assays. RESULTS: Among the animals examined, 3.2% and 6.7% showed signs of VL, confirmed by indirect immunofluorescence and immunoenzymatic assays, respectively, with a distribution of 29.9% (24 dogs) in the rural zone and 4.9% (288 dogs) in the urban zone (p = 0.001). The clinical evaluation on seropositive dogs showed both asymptomatic animals (2.4%) and symptomatic animals (47.6%), along with other abnormalities (e.g. normocytic and normochromic anemia, with leukocytosis and thrombocytopenia). Observations relating to phenotypic characteristics (e.g. sex, age, breed and hair) did not present statistical significance, although high seropositivity among male, short-haired and mixed-breed dogs was observed. CONCLUSIONS: The findings showed that VL was a predominantly rural zoonosis and that close contact between poultry and domestic dogs significantly increased the risk of canine infection in this region.

Sand fly captures with Disney traps in area of occurrence of Leishmania (Leishmania) amazonensis in the state of Mato Grosso do Sul, mid-western Brazil

INTRODUCTION: The work was conducted to study phlebotomine fauna (Diptera: Psychodidae) and aspects of American cutaneous leishmaniasis transmission in a forested area where Leishmania (Leishmania) amazonensis occurs, situated in the municipality of Bela Vista, State of Mato Grosso do Sul, Brazil. METHODS: The captures were conducted with modified Disney traps, using hamster (Mesocricetus auratus) as bait, from May 2004 to January 2006. RESULTS: Ten species of phlebotomine sandflies were captured: Brumptomyia avellari, Brumptomyia brumpti, Bichromomyia flaviscutellata, Evandromyia bourrouli, Evandromyia lenti, Lutzomyia longipalpis, Psathyromyia campograndensis, Psathyromyia punctigeniculata, Psathyromyia shannoni and Sciopemyia sordellii. The two predominant species were Ev bourrouli (57.3%) and Bi flaviscutellata (41.4%), present at all sampling sites. Two of the 36 hamsters used as bait presented natural infection with Leishmania. The parasite was identified as Leishmania (Leishmania) amazonensis. CONCLUSIONS: Analysis of the results revealed the efficiency of Disney traps for capturing Bichromomyia flaviscutellata and the simultaneous presence of both vector and the Leishmania species transmitted by the same can be considered a predictive factor of the occurrence of leishmaniasis outbreaks for the human population that occupies the location.

Phlebotomine sandflies (Diptera: Psychodidae) in Governador Valadares, a transmission area for American tegumentary leishmaniasis in State of Minas Gerais, Brazil

INTRODUCTION: A study on the phlebotomine sandfly fauna was carried out in an endemic area for American tegumentary leishmaniasis in the municipality of Governador Valadares, in the State of Minas Gerais, Brazil. METHODS: Captures were undertaken using HP light traps in four districts, on three nights per month, for one year (from January to December 2008). Correlations between climatic factors (temperature, relative air humidity and rainfall) and the numbers of sandflies collected was observed. RESULTS: 5,413 phlebotomine specimens were caught and were identified as belonging to 12 species. Of these specimens, 2,851 (52%) were females and 2,562 (48%) were males. CONCLUSIONS: Lutzomyia intermedia predominated (29.9% of the species caught), thus suggesting that they were responsible for transmission of American tegumentary leishmaniasis, together with L. whitmani, which was also found in the area (4.3%). The presence of L. longipalpis (11.9%), the main vector for visceral leishmaniasis in Brazil, is an important finding, which makes rigorous entomological surveillance of the area necessary.

Caracterização física de argamassas de cal aérea com resíduos de cerâmica

A reabilitação e manutenção das fachadas antigas requer especial atenção sobretudo porque os materiais atualmente utilizados não correspondem, muitas vezes, aos requisitos exigidos para o efeito. No caso concreto das argamassas de reboco é possível observar com frequência erros associados à escolha dos produtos, que induzem uma degradação acelerada dos revestimentos e particularmente dos respetivos suportes, comprometendo a durabilidade dos sistemas. Era frequente, no passado, o recurso a argamassas de cal aérea e, em alguns casos, com incorporação de resíduos de cerâmica, que lhes conferiam um desempenho melhorado. Nestas circunstâncias, e tendo em conta o volume de resíduos produzidos pelas indústrias cerâmicas, geralmente depositados em aterro, o desenvolvimento de soluções de argamassas de revestimento com incorporação destes resíduos poderá apresentar-se como uma solução viável, não só do ponto de vista técnico, mas também ambiental. Este estudo apresenta a caracterização de argamassas de cal aérea ao traço 1:2 e 1:3 com resíduos de cerâmica, destinadas à reabilitação de rebocos de edifícios, no que respeita ao comportamento face à presença de água. Verifica-se que a introdução de resíduos conduziu ao aumento da resistência à difusão do vapor de água, da absorção de água por capilaridade e da porosidade aberta e à redução da capacidade de secagem. No entanto as diferenças face às argamassas de referência só de cal foram geralmente pouco significativas, pelo que particularmente as argamassas ao traço 1:2 com resíduos indiciam ser adequadas para aplicação em edifícios antigos.

Frequency of metabolic syndrome and the food intake patterns in adults living in a rural area of Brazil

INTRODUCTION: Metabolic syndrome (MetS), a risk factor for atherosclerosis and coronary heart disease, is related to an inadequate food intake pattern. Its incidence is increasing among Brazilian adults, including those living in rural areas. Our aim was not only to describe the frequency of MetS in adults with or without MetS but also to compare their food intake pattern as assessed by the healthy eating index (HEI) and serum albumin and C reactive protein (CRP) levels. METHODS: Men and women (n = 246) living in a small village in Brazil were included. MetS was characterized according to the adult treatment panel (ATP III) criteria. Groups were compared by chi-square, student t or Mann-Whitney tests. RESULTS: MetS was diagnosed in 15.4% of the cases. The MetS group showed higher CRP (1.8±1.2 vs. 1.0±0.9 mg/dl) and lower albumin (4.3±0.3 vs. 4.4±0.3 g/dl) serum levels compared to the control group. Additionally, the MetS group showed lower scores (median[range]) in the HEI compared to the control group (53.5[31.2-78.1] vs 58[29.7-89.5], respectively). The MetS group also had decreased scores for total fat and daily variety of food intake. CONCLUSIONS: The results suggest that adults with MetS displayed chronic mild inflammation and a poorer food intake pattern than the control group.

Extração automática de elementos em fotografia aérea por fotogrametria

Na cadeia de produção de cartografia digital, que se encontra implementada no IGeoE, existe a necessidade de efetuar a restituição de objetos através da vetorização 3D. Sendo este processo completamente manual, o operador identifica e adquire os objetos, em ambiente estereoscópico, segundo as regras estabelecidas nas normas de aquisição. A aquisição de construções, nomeadamente os edifícios, são dos objetos que mais recursos consomem devido à sua frequência e dificuldade de restituição. A possibilidade de simplificar esta parte do processo proporciona um beneficio substancial para toda a cadeia de produção. Pretende-se assim detetar edifícios em fotografias aéreas, extraindo a sua informação planimétrica e altimétrica, para posterior inserção num SIG. Para a obtenção da altimetria são utilizados os princípios de fotogrametria analítica através das equações de colinearidade. Este problema torna-se relevante devido ao facto de se pretender retirar informação de fotografias, que possuem bastante informação, com recurso à computação gráfica, através de técnicas de segmentação em vários níveis e fotogrametria, juntando assim duas áreas do saber. Esta solução permite automatizar um processo que é predominantemente manual, contribuindo para melhorar a cadeia de produção sem a alteração de funcionamento da mesma.

Risk factors for Leishmania chagasi infection in an endemic area in Raposa, State of Maranhão, Brazil

INTRODUCTION: Infection with Leishmania chagasi is the most common clinical presentation for visceral leishmaniaisis in endemic areas. The municipality of Raposa is an endemic area in State of Maranhão, Brazil, and have had registration cases of visceral leishmaniasis disease. For this reason, a cross- sectional study was conducted to evaluate the risk factors for infection with L. chagasi detected by Montenegro skin test. METHODS: The sample comprised 96% of the inhabitants of the villages of Maresia, Pantoja, and Marisol located in the municipality of Raposa, corresponding to 1,359 subjects. Data were collected using a questionnaire. Univariate and multivariate logistic regression models were applied to evaluate the association between the variables studied and infection of L. chagasi. RESULTS: The variables associated with infection upon nonadjusted analysis were a straw roof, mud walls, floors of beaten earth, presence of sand flies inside or outside of the dwelling, and bathing outdoors. Adjusted analysis showed that the presence of sand flies inside/outside the dwelling was a risk factor, and age younger than 10 years was a protective factor against asymptomatic infection. CONCLUSIONS: The results highlight the extent to which precarious living conditions of the population strengthen the epidemiological chain of visceral leishmaniasis.

Characterization of Leishmania infantum species in dogs from the urban area of Cuiabá, State of Mato Grosso, Brazil

INTRODUCTION: Visceral leishmaniasis presents urban behavior in some Brazilian cities, with domestic dogs as the main infection source. In Cuiabá, MT, canine visceral leishmaniasis was diagnosed and characterized as recommended by the Ministry of Health. METHODS: Biological samples from suspected canine carriers were analyzed by the isoenzyme electrophoresis technique. The 6PGDH enzyme and reference strain IOC/L0566 (MHOM/BR/1975/M2903) of Leishmania (Leishmania) infantum was used as one of the controls. RESULTS: Electrophoresis analysis revealed that the canine isolates belonged to the species L. (L.) infantum. CONCLUSIONS: The authors emphasize the importance of species characterization, particularly in areas of mixed infection like Cuiabá.

Phlebotomine sandflies (Diptera: Psychodidae) in São Vicente Férrer, a sympatric area to cutaneous and visceral leishmaniasis in the state of Pernambuco, Brazil

INTRODUCTION: In the last decades, a considerable geographic expansion of the leishmaniases in all regions of Brazil has been observed. The present study was carried out to identify the composition of the phlebotomine sandfly fauna and verify the seasonal variation of the main species after environmental changes occurred in São Vicente Férrer Municipality, State of Pernambuco, Brazil. METHODS: Captures were carried out during four consecutive nights of each month using Centers for Disease Control and Prevention light traps from September 2009 to September 2010. The correlation between the number of phlebotomine sandflies captured and climatic factors (temperature and rainfall) was evaluated. RESULTS: A total of 13,872 specimens belonging to 20 species were captured, of which, 6,247 (45%) were females, and 7,625 (55%) were males. Lutzomyia migonei was the most abundant species with 9,964 (71.8%) specimens, being predominant in the intradomicile and peridomicile areas with 108 (86.4%) and 9,746 (97%), respectively. In the forest remnants, Lutzomyia complexa 2,395 (65%) and Lutzomyia sordellii 770 (20.8%) predominated. The correlation analysis between the total number of sandflies captured and climatic factors did not show a significant influence on population density. CONCLUSIONS: The high abundance of Lutzomyia migonei and Lutzomyia complexa indicates the possibility of new cases of cutaneous leishmaniasis (CL).

Lutzomyia longipalpis (Diptera: Psychodidae: Phlebotominae) in the region of Saquarema: potential area of visceral leishmaniasis transmission in the state of Rio de Janeiro, Brazil

INTRODUCTION: Lutzomyia longipalpis is the main vector of Leishmania infantum chagasi in the Americas. METHODS: Phlebotomine captures were conducted during 2008 and 2009 in a rural area endemic for cutaneous leishmaniasis located in the municipality of Saquarema, Rio de Janeiro. RESULTS: Among other species captured, we observed the presence of Lutzomyia longipalpis. CONCLUSIONS: This is the first report of the occurrence of Lutzomyia longipalpis in this region, demonstrating the potential risk of visceral leishmaniasis transmission in the coastal area of the State of Rio de Janeiro. Therefore, active vigilance by all municipalities in the area is necessary.