RESUMO Amidos e seus derivados são utilizados em praticamente todos os setores industriais. Na indústria petrolífera podem ser empregados como aditivos controladores de filtrado, os quais controlam eficazmente a perda de fluido para a formação rochosa adjacente. O presente trabalho teve como objetivo avaliar o uso de amidos, de mandioca e de milho, utilizados na mineração, como redutor de filtrado em fluidos de perfuração poliméricos para poços de petróleo e gás. O estudo foi realizado em três etapas: na primeira etapa, cinco diferentes tipos de amidos modificados foram caracterizados por meio dos ensaios de viscosidade e índice de solubilidade em água; na segunda, as amostras de amido foram avaliadas de acordo com a norma da Petrobras (PE-2POC-00727-0) e, na terceira e última etapa, as amostras que, atenderam as especificações da norma, foram avaliadas nas concentrações de 0 a 9g/350mL de água, em uma formulação típica de fluido polimérico visando avaliar as propriedades reológicas e de filtração. Os dados obtidos foram comparados com um fluido polimérico aditivado com amido comercial. Os resultados demonstraram que dentre as cinco amostras estudadas, apenas a denominada de CMAN-AV foi considerada aprovada na norma e, quando adicionada ao fluido polimérico conferiu propriedades reológicas e de filtração semelhantes ao fluido aditivado com o amido comercial. Dessa forma, conclui-se que a amostra CMAN-AV pode ser utilizada como redutor de filtrado em fluido de perfuração polimérico.

ABSTRACT Starches and their derivatives are used in virtually all industrial sectors. In the petroleum industry the can be used as filtrate additives which effectively control the loss of fluid to the adjacent rock formation. The present work had as objective to evaluate the use of starches, of manioc and maize, used in the mining, as a filtrate reducer in polymeric drilling fluids for oil and gas wells. The study was carried out in three stages: in the first step, five different types of modified starches were characterized by the viscosity and water solubility index tests; in the second, the starch samples were evaluated according of with the of the Petrobras standard (PE-2POC-00727-0) and, in the third and last step, the samples that, attended the specifications of the standard, were evaluated in the concentrations of 0 to 9g/350mL of water, in a typical formulation of polymeric fluid aiming to evaluate the rheological and filtration properties. The data obtained were compared with a polymer fluid additived with commercial starch. The results showed that among the five samples studied, only the called of CMAN-AV was considered approved in the standard and, when added to the polymeric fluid gaved rheological and filtration properties similar to the fluid additived with the commercial starch. Thus, it is concluded that sample CMAN-AV can be used as a filtrate reducer in polymeric drilling fluid.

Abstract The symptoms of chikungunya virus (CHIKV) infection include fever, headache, muscle aches, skin rash, and polyarthralgia, characterized by intense pain, edema, and temporary functional impairment. This is the first report of encephalitis caused by CHIKV infection associated with an atypical presentation of syndrome of inappropriate antidiuretic hormone secretion, evolving to cognitive impairment and apraxia of speech.

Resumo Objetivos: descrever as características clínicas e desfechos de pneumonia comunitária aguda em crianças assistidas em hospital público de referência no Estado de Pernambuco, Brasil (2010-2011). Métodos: série de casos de pneumonia em 80 crianças de 28 dias a 14 anos no Hospital da Restauração em Pernambuco, Brasil, entre maio de 2010 a 2011. As informações foram anotadas do registro hospitalar, sendo criado dois grupos de comparação de acordo com a gravidade da doença, considerando a presença ou não de derrame pleural. A análise comparativa utilizou os testes de Fisher ou Mann-Whitney. Resultados: pneumonia grave com derrame pleural foi mais frequente em menores de cinco anos (p=0,025), associado a maior período de febre (19 x 15 dias) e tosse (17 x 13 dias), compardo com casos de pneumonia não-complicada. Seis crianças (7,5%, 6/80) morreram. 50% antes do quarto dia de internação (p= 0,001). As mortes foram no grupo com derrame pleural, em crianças do interior do estado (p= 0,026). Conclusões: a gravidade da pneumonia em crianças atendidas neste hospital está relacionada a crianças menores, e naquelas transferidas de unidades de saúde do interior, cujo diagnóstico precoce e intervenção médica adequada são limitados pela infraestrutura e recursos disponíveis para a saúde.

Abstract Objectives: to describe the clinical characteristics and outcomes of acute community acquired pneumonia in children at a reference public hospital in Pernambuco State, Brazil (2010-2011) Methods: pneumonia case series of 80 children aged 28 days to 14 years old at Hospital da Restauração in Pernambuco, Brazil, from 2010 to 2011. Information was noted from medical files, and two comparison groups were created according to the severity of the disease, considering the presence of pleural effusion. Fisher or Mann-Whitney tests were used for comparative analyses. Results: severe pneumonia with pleural effusion was more frequent in children under five years of age (p=0,025), and was associated with longer period of fever (19 x 15 days) and coughing (17 x 13 days), when compared to non-complicated pneumonia cases. Six children (7,5%, 6/80) died, 50% before the fourth day of hospitalization (p=0,001). All deaths were from the pleural effusion group in children from the countryside (p=0,026). Conclusions: the severity of pneumonia in children attended at this hospital is related to younger children, and those transferred from the health units in the countryside, so, early diagnosis and medical intervention are limited by infrastructure and available resources for the health.

The present study analysed the concordance among four different molecular diagnostic methods for tuberculosis (TB) in pulmonary and blood samples from immunocompromised patients. A total of 165 blood and 194 sputum samples were collected from 181 human immunodeficiency virus (HIV)-infected patients with upper respiratory complaints, regardless of suspicious for TB. The samples were submitted for smear microscopy, culture and molecular tests: a laboratory-developed conventional polymerase chain reaction (PCR) and real-time quantitative PCR (qPCR) and the Gen-Probe and Detect-TB Ampligenix kits. The samples were handled blindly by all the technicians involved, from sample processing to results analysis. For sputum, the sensitivity and specificity were 100% and 96.7% for qPCR, 81.8% and 94.5% for Gen-Probe and 100% and 66.3% for Detect-TB, respectively. qPCR presented the best concordance with sputum culture [kappa (k) = 0.864)], followed by Gen-Probe (k = 0.682). For blood samples, qPCR showed 100% sensitivity and 92.3% specificity, with a substantial correlation with sputum culture (k = 0.754) and with the qPCR results obtained from sputum of the corresponding patient (k = 0.630). Conventional PCR demonstrated the worst results for sputa and blood, with a sensitivity of 100% vs. 88.9% and a specificity of 46.3% vs. 32%, respectively. Commercial or laboratory-developed molecular assays can overcome the difficulties in the diagnosis of TB in paucibacillary patients using conventional methods available in most laboratories.

Human immunodeficiency virus (HIV)-positive patients have a greater prevalence of coinfection with human papillomavirus (HPV) is of high oncogenic risk. Indeed, the presence of the virus favours intraepithelial squamous cell lesion progression and may induce cancer. The aim of this study was to evaluate the prevalence of HPV infection, distribution of HPV types and risk factors among HIV-positive patients. Cervical samples from 450 HIV-positive patients were analysed with regard to oncotic cytology, colposcopy and HPV presence and type by means of polymerase chain reaction and sequencing. The results were analysed by comparing demographic data and data relating to HPV and HIV infection. The prevalence of HPV was 47.5%. Among the HPV-positive samples, 59% included viral types of high oncogenic risk. Multivariate analysis showed an association between HPV infection and the presence of cytological alterations (p = 0.003), age greater than or equal to 35 years (p = 0.002), number of partners greater than three (p = 0.002), CD4+ lymphocyte count < 200/mm3 (p = 0.041) and alcohol abuse (p = 0.004). Although high-risk HPV was present in the majority of the lesions studied, the low frequency of HPV 16 (3.3%), low occurrence of cervical lesions and preserved immunological state in most of the HIV-positive patients were factors that may explain the low occurrence of precancerous cervical lesions in this population.

OBJETIVO: comparar o desempenho físico e cardiorrespiratório do teste de caminhada de seis minutos (TC 6 min) em crianças asmáticas com valores de referência para saudáveis da mesma faixa etária e correlacioná-los com variáveis intervenientes.MÉTODOS: estudo transversal, prospectivo,em crianças com asma moderada/grave, entre seis e 16 anos, em acompanhamento ambulatorial. Coletaram-se dados demográficos e espirométricos. Os pacientes responderam questionário de qualidade de vida em asma (PAQLQ) e nível de atividade física basal. O TC 6 min foi realizado segundo recomendações da American Thoracic Society. Para comparações de médias usou-se teste t e correlação de Pearson para analisar o TC 6 min com variáveis estudadas. Nível de significância de 5%.RESULTADOS: incluídas 40 crianças, 52,5% meninos, 70% eutróficas e sedentárias. A média deidade 11,3 ± 2,1 anos, altura 1,5 ± 0,1 m e peso 40,8 ± 12,6 Kg. A média da distância percorrida no TC 6 min foi significativamente inferior correspondendo a 71,9% ± 19,7 dos valores previstos, onde as crianças sedentárias exibiram os piores valores. A diferença entre a distância percorrida no teste e os valores preditos mostrou correlação positiva com a idade (r = 0,373, p = 0,018) e negativa com a frequência cardíaca ao final do teste (r = -0,518, p < 0,001). Na avaliação da qualidade de vida, os valores do quesito limitações das atividades físicas, demonstraram pior pontuação com correlação negativa com a diferença das distâncias percorridas (r = -0,311,p = 0,051).CONCLUSÕES: o desempenho do TC6 min em crianças asmáticas avaliado através da distância percorrida é significativamente inferior aos valores previstos para saudáveis da mesma faixa etária, sendo influenciado diretamente pelo sedentarismo.

OBJECTIVE:to compare physical performance and cardiorespiratory responses in the six-minute walk test (6MWT) in asthmatic children with reference values for healthy children in the same age group, and to correlate them with intervening variables.METHODS:this was a cross-sectional, prospective study that evaluated children with moderate/severe asthma, aged between 6 and 16 years, in outpatient follow-up. Demographic and spirometric test data were collected. All patients answered the pediatric asthma quality of life (QoL) questionnaire (PAQLQ) and level of basal physical activity. The 6MWT was performed, following the American Thoracic Society recommendations. Comparison of means was performed using Student's t-test and Pearson's correlation to analyze the 6MWT with study variables. The significance level was set at 5%.RESULTS:40 children with moderate or severe asthma were included, 52.5% males, 70% with normal weight and sedentary. Mean age was 11.3 ± 2.1 years, mean height was 1.5 ± 0.1 m, and mean weight was 40.8 ± 12.6 Kg. The mean distance walked in the 6MWT was significantly lower, corresponding to 71.9% ± 19.7% of predicted values; sedentary children had the worst values. The difference between the distance walked on the test and the predicted values showed positive correlation with age (r = 0.373, p = 0.018) and negative correlation with cardiac rate at the end of the test (r = -0.518, p < 0.001). Regarding QoL assessment, the values in the question about physical activity limitations showed the worst scores, with a negative correlation with walked distance difference (r = -0.311, p = 0.051).CONCLUSIONS:asthmatic children's performance in the 6MWT evaluated through distance walked is significantly lower than the predicted values for healthy children of the same age, and is directly influenced by sedentary life style.

OBJETIVO: comparar o desempenho físico e cardiorrespiratório do teste de caminhada de seis minutos (TC 6 min) em crianças asmáticas com valores de referência para saudáveis da mesma faixa etária e correlacioná-los com variáveis intervenientes.MÉTODOS: estudo transversal, prospectivo,em crianças com asma moderada/grave, entre seis e 16 anos, em acompanhamento ambulatorial. Coletaram-se dados demográficos e espirométricos. Os pacientes responderam questionário de qualidade de vida em asma (PAQLQ) e nível de atividade física basal. O TC 6 min foi realizado segundo recomendações da American Thoracic Society. Para comparações de médias usou-se teste t e correlação de Pearson para analisar o TC 6 min com variáveis estudadas. Nível de significância de 5%.RESULTADOS: incluídas 40 crianças, 52,5% meninos, 70% eutróficas e sedentárias. A média deidade 11,3 ± 2,1 anos, altura 1,5 ± 0,1 m e peso 40,8 ± 12,6 Kg. A média da distância percorrida no TC 6 min foi significativamente inferior correspondendo a 71,9% ± 19,7 dos valores previstos, onde as crianças sedentárias exibiram os piores valores. A diferença entre a distância percorrida no teste e os valores preditos mostrou correlação positiva com a idade (r = 0,373, p = 0,018) e negativa com a frequência cardíaca ao final do teste (r = -0,518, p < 0,001). Na avaliação da qualidade de vida, os valores do quesito limitações das atividades físicas, demonstraram pior pontuação com correlação negativa com a diferença das distâncias percorridas (r = -0,311,p = 0,051).CONCLUSÕES: o desempenho do TC6 min em crianças asmáticas avaliado através da distância percorrida é significativamente inferior aos valores previstos para saudáveis da mesma faixa etária, sendo influenciado diretamente pelo sedentarismo.

OBJECTIVE:to compare physical performance and cardiorespiratory responses in the six-minute walk test (6MWT) in asthmatic children with reference values for healthy children in the same age group, and to correlate them with intervening variables.METHODS:this was a cross-sectional, prospective study that evaluated children with moderate/severe asthma, aged between 6 and 16 years, in outpatient follow-up. Demographic and spirometric test data were collected. All patients answered the pediatric asthma quality of life (QoL) questionnaire (PAQLQ) and level of basal physical activity. The 6MWT was performed, following the American Thoracic Society recommendations. Comparison of means was performed using Student's t-test and Pearson's correlation to analyze the 6MWT with study variables. The significance level was set at 5%.RESULTS:40 children with moderate or severe asthma were included, 52.5% males, 70% with normal weight and sedentary. Mean age was 11.3 ± 2.1 years, mean height was 1.5 ± 0.1 m, and mean weight was 40.8 ± 12.6 Kg. The mean distance walked in the 6MWT was significantly lower, corresponding to 71.9% ± 19.7% of predicted values; sedentary children had the worst values. The difference between the distance walked on the test and the predicted values showed positive correlation with age (r = 0.373, p = 0.018) and negative correlation with cardiac rate at the end of the test (r = -0.518, p < 0.001). Regarding QoL assessment, the values in the question about physical activity limitations showed the worst scores, with a negative correlation with walked distance difference (r = -0.311, p = 0.051).CONCLUSIONS:asthmatic children's performance in the 6MWT evaluated through distance walked is significantly lower than the predicted values for healthy children of the same age, and is directly influenced by sedentary life style.

We analysed 16 variable number tandem repeats (VNTR) and three single-nucleotide polymorphisms (SNP) in Mycobacterium leprae present on 115 Ziehl-Neelsen (Z-N)-stained slides and in 51 skin biopsy samples derived from leprosy patients from Ceará (n = 23), Pernambuco (n = 41), Rio de Janeiro (n = 22) and Rondônia (RO) (n = 78). All skin biopsies yielded SNP-based genotypes, while 48 of the samples (94.1%) yielded complete VNTR genotypes. We evaluated two procedures for extracting M. leprae DNA from Z-N-stained slides: the first including Chelex and the other combining proteinase and sodium dodecyl sulfate. Of the 76 samples processed using the first procedure, 30.2% were positive for 16 or 15 VNTRs, whereas of the 39 samples processed using the second procedure, 28.2% yielded genotypes defined by at least 10 VNTRs. Combined VNTR and SNP analysis revealed large variability in genotypes, but a high prevalence of SNP genotype 4 in the Northeast Region of Brazil. Our observation of two samples from RO with an identical genotype and seven groups with similar genotypes, including four derived from residents of the same state or region, suggest a tendency to form groups according to the origin of the isolates. This study demonstrates the existence of geographically related M. leprae genotypes and that Z-N-stained slides are an alternative source for M. leprae genotyping.

INTRODUÇÃO: Para investigar susceptibilidade às reações hansênicas, três polimorfismos do gene natural resistance-associated macrophage protein (NRAMP1), foram determinados em 201 indivíduos, atendidos em dois centros de referência no Recife, entre 2007 e 2008, sendo 100 paucibacilares e 101 multibacilares. MÉTODOS: A determinação dos polimorfismos 274C/T, D543N e 1729+55del4 do gene NRAMP1 foi realizada utilizando a técnica do polimorfismo de fragmento de restrição em DNA extraído de sangue periférico e as estimativas das freqüências alélicas e genotípicas foram feitas por contagem direta. RESULTADOS: Os genótipos predominantes foram: CC (51,8%) para 274C/T, GG (86,6%) para D543N e +-TGTG (59,9%) para 1729+55del4. O genótipo mutante 274 TT predominou na negatividade da reação reversa (p=0,03) e na positividade do eritema nodoso (p=0,04). CONCLUSÕES: Nossos resultados sugerem que o polimorfismo 274 C/T do gene NRAMP1 pode auxiliar na determinação da susceptibilidade à reação tipo II em indivíduos com hanseníase.

INTRODUCTION: To investigate susceptibility to leprosy reactions, three polymorphisms of the natural resistance-associated macrophage protein (NRAMP1) gene were determined in 201 individuals who were attended at two reference centers in Recife, between 2007 and 2008. Of these, 100 were paucibacillary and 101 were multibacillary. METHODS: The 274C/T, D543N and 1729+55del4 polymorphisms of the NRAMP1 gene were determined using the technique of restriction fragment polymorphism on DNA extracted from peripheral blood. Allelic and genotypic frequencies were estimated by direct counting. RESULTS: The predominant genotypes were: CC (51.8%) for 274C/T; GG (86.6%) for D543N; and +-TGTG (59.9%) for 1729+55del4. The mutant genotype 274 TT predominated in negativity of the reverse reaction (p = 0.03) and in positivity of erythema nodosum leprosum (p = 0.04). CONCLUSIONS: Our results suggest that 274 C/T polymorphism of the NRAMP1 gene may aid in determining the susceptibility to type II reactions among leprosy patients.

Women with human immunodeficiency virus (HIV) infection present a higher risk of infection by the human papillomavirus (HPV) and cervical cancer. To determine HPV genotypes and frequencies among HIV-positive women, an analytical cross-sectional study was carried out on 147 women (51 were pregnant and HIV-positive, 45 pregnant and HIV-negative and 51 HIV-positive and not pregnant), who were attended at a maternity hospital in Recife between April 2006-May 2007. They answered a questionnaire and underwent a gynaecological examination, with samples collected for HPV investigation by PCR, hybrid capture II, oncotic colpocytology (Papanicolau) and colposcopy. The frequency of HPV DNA was 85.3% (122/143), with a high proportion of HPV types that have been identified as high risk for cervical cancer. Among HIV-positive pregnant women, there was an HPV prevalence of 96% (48/50), of whom 60.4% (29/48) were high-risk. HPV 16, 58, 18, 66 and 31 were the most frequent types. Colpocytological abnormalities were observed in 35.3% (18/51) of HIV-positive non-pregnant women, 21.6% (11/51) of HIV-positive pregnant women and 13.3% (6/45) of HIV-negative pregnant women with a predominance of low-level lesions. A high prevalence of HPV infection was identified, especially with the high-risk types 16, 58, 18 and 66. This study identified high-risk HPV types in all three groups examined (HIV-positive pregnant women, HIV-negative pregnant women and HIV-positive not pregnant), characterising its distribution in this setting.

A leucemia de células T no adulto (ATL) é causada pelo vírus linfotrópico de células T (HTLV-1). Contudo, apenas 2%-5% dos indivíduos infectados desenvolvem a ATL e somente 40-60 anos após a infecção. Um fator de risco para adquirir a doença é a via da transmissão do vírus pela amamentação e durante o parto, sugerindo que a criança já é portadora do vírus. Desde a descoberta do vírus, em 1980, vários artigos científicos foram publicados descrevendo as manifestações clínicas, biologia do vírus e alterações intracelulares induzidas pelo vírus. Esta revisão visa explorar alguns aspectos da relação entre HTLV-1 e a leucemia de células T do Adulto.

The human T-lymphotropic virus (HTLV-1) is known to be the etiologic agent of adult T-cell leukemia (ATL). Only 2-5% of infected individuals develop ATL and even then only 40-60 years after infection. One risk factor to develop ATL is the transmission of the virus by breastfeeding and during delivery, suggesting that infants of infected mothers are already carriers of the virus. Since the discovery of the virus in 1980 many scientific papers have been published describing the clinical manifestations, biology of the virus and the intracellular alterations induced by the virus. This review aims to explore some aspects of the relationship between HTLV-1 and ATL.

Molecular characterization of Paracoccidioides brasiliensis variant strains that had been preserved under mineral oil for decades was carried out by random amplified polymorphic DNA analysis (RAPD). On P. brasiliensis variants in the transitional phase and strains with typical morphology, RAPD produced reproducible polymorphic amplification products that differentiated them. A dendrogram based on the generated RAPD patterns placed the 14 P. brasiliensis strains into five groups with similarity coefficients of 72%. A high correlation between the genotypic and phenotypic characteristics of the strains was observed. A 750 bp-RAPD fragment found only in the wild-type phenotype strains was cloned and sequenced. Genetic similarity analysis using BLASTx suggested that this RAPD marker represents a putative domain of a hypothetical flavin-binding monooxygenase (FMO)-like protein of Neurospora crassa.

O objetivo do presente estudo foi investigar a freqüência e fatores de risco para o desenvolvimento de tuberculose multidroga resistente, na Cidade do Cabo de Santo Agostinho, PE. Este é um estudo prospectivo realizado entre 2000-2003 onde casos suspeitos foram investigados por baciloscopia e cultura. De 232 casos de tuberculose confirmados, 174 tiveram cultura e antibiograma realizados. Trinta e cinco das 174 culturas mostraram resistência a qualquer uma das drogas. A freqüência de resistência primária e adquirida a qualquer droga foi 14% e 50% respectivamente enquanto a freqüência primária e adquirida para multidroga resistência foi 8,3% e 40%. Tratamento prévio para tuberculose ou abandono de tratamento consistiu em fatores de risco para resistência a drogas. Os altos níveis de resistência primária e adquirida a combinação isoniazida e rifampicina contribuem para as dificuldades no controle da transmissão da tuberculose no Cabo.

The objective of the present study was to investigate the frequency and risk factors for developing multidrug-resistant tuberculosis in Cabo de Santo Agostinho, PE. This was a prospective study conducted from 2000 to 2003, in which suspected cases were investigated using bacilloscopy and culturing. Out of 232 confirmed cases of tuberculosis, culturing and antibiotic susceptibility tests were performed on 174. Thirty-five of the 174 cultures showed resistance to all drugs. The frequencies of primary and acquired resistance to any drug were 14% and 50% respectively, while the frequencies of primary and acquired multidrug resistance were 8.3% and 40%. Previous tuberculosis treatment and abandonment of treatment were risk factors for drug resistance. The high levels of primary and acquired resistance to the combination of isoniazid and rifampicin contributed towards the difficulties in controlling tuberculosis transmission in the city.