Composição química e toxicidade frente Aedes aegypti L. e Artemia salina Leach do óleo essencial das folhas de Myrcia sylvatica (G. Mey. ) DC. / Chemical composition and toxicity against Aedes aegypti L. and Artemia salina Leach of the essential oil from Myrcia sylvatica (G. Mey. ) DC. leaves.

RESUMO A dengue está entre as doenças virais de propagação vetorial mais importante no mundo, causando sérios impactos de morbidade e mortalidade. Desta forma, o presente trabalho teve como objetivo analisar a composição química e a toxicidade do óleo essencial de Myrcia sylvatica (G. Mey) D.C. frente Aedes aegypti e Artemia salina. Folhas de M. sylvatica foram coletadas no Parque Nacional da Chapada das Mesas, no município de Carolina (MA) no mês de fevereiro de 2012. O óleo foi obtido por hidrodestilação e sua composição química foi determinada por cromatografia gasosa acoplada à espectrometria de massa (CG/EM). O bioensaio frente Artemia salina e às larvas de 3° estádio de Aedes aegypti foram realizados em diferentes concentrações. Os dados de mortalidade foram avaliados por regressão linear para determinar os valores de CL50. Obteve-se 0,5% de rendimento, sendo o (E)-cariofileno o constituinte majoritário. O óleo essencial apresentou uma CL50 = 79,44 µg/mL frente A. salina, sendo considerado altamente tóxico. No entanto, este óleo não demonstrou efeito sobre as larvas de A. aegypti. Considerando que o teste de Artemia salina tem correlação com atividades biológicas de grande interesse terapêutico como antitumoral, o óleo essencial das folhas de M. sylvatica demonstrou potencial para desenvolvimento de produtos farmacêuticos.

ABSTRACT Dengue is among the most important viral diseases of vector spread in the world, causing serious impacts of morbidity and mortality. Thus, this study aimed to analyze the chemical composition and toxicity of the Myrcia sylvatica (G. Mey.) DC essential oil against Aedes aegypti and Artemia salina Leach. Leaves of M. sylvatica. were collected in the Tables Chapada National Park, in the municipality of Carolina (MA) in february 2012. The oil was obtained by hydrodistillation and their chemical composition was determined by GC / MS. The bioassay front and Artemia salina larvae of the 3° stage of Aedes aegypti were performed at different concentrations. Mortality data were evaluated by linear regression to determine the LC50. Was obtained 0.5% yield values, and (E) -caryophyllene the major constituent. The essential oil showed a LC50 = 79.44 mg / mL front A. saline and is considered highly toxic. However, this oil showed no effect on larvae of A. aegypti. Whereas the brine shrimp test has regard to several biological activities, as antitumoral property, the essential oil from the leaves of M. sylvatica demonstrated potential for development of medicines.

Diagnosis of sarcoidosis in the endobronchial ultrasound-guided transbronchial needle aspiration era.

BACKGROUND: Sarcoidosis is a multisystemic disorder of unknown etiology. Its diagnosis is based on compatible clinical and radiological features and supported by histological demonstration of epithelioid cell noncaseating granulomas with exclusion of other causes. Endobronchial ultrasound combined with transbronchial needle aspiration (EBUS-TBNA) has been proposed as a valuable tool in obtaining suitable tissue sample. The aim of this study was to evaluate the contribution of EBUS-TBNA to the diagnosis of stages I and II thoracic sarcoidosis in a community-based hospital. METHODS: A prospective study was conducted in patients with suspected stages I and II pulmonary sarcoidosis, based on clinical and radiological data, who were being followed in our Interstitial Lung Disorders Outpatient Clinic or sent from other hospitals to our Respiratory Endoscopy Unit for diagnostic procedures. All suitable and fit patients underwent EBUS-TBNA between March 2010 and June 2013. We assessed demographic characteristics, radiological stages, cytological/histological examination and diagnostic techniques performed. RESULTS: In the period considered 39 patients underwent EBUS-TBNA for suspected stages I and II thoracic sarcoidosis and adequate samples were obtained in 38 (97.4%). Within this population, 33 (84.6%) patients had a definite diagnosis of sarcoidosis, of which 31 patients (93.9%) were confirmed to have epithelioid noncaseating granulomas by EBUS-TBNA. Four patients were submitted to surgical procedures (three to mediastinoscopy and one to open surgical lung biopsy). Data analysis allowed to calculate a sensitivity, specificity, positive predictive value, negative predictive value and diagnostic accuracy of 93.9%, 100%, 100%, 75.0% and 94.8%, respectively. No complications were observed. CONCLUSIONS: EBUS-TBNA is a valuable tool in the diagnostic workup of patients with suspected stages I and II thoracic sarcoidosis providing a substantial number of pathological confirmations and with few complications. Its high diagnostic accuracy precludes the need for more invasive procedures such as surgical biopsy.

Pneumococcal pneumonia - Are the new severity scores more accurate in predicting adverse outcomes?

INTRODUCTION: The site-of-care decision is one of the most important factors in the management of patients with community-acquired pneumonia. The severity scores are validated prognostic tools for community-acquired pneumonia mortality and treatment site decision. The aim of this paper was to compare the discriminatory power of four scores - the classic PSI and CURB65 ant the most recent SCAP and SMART-COP - in predicting major adverse events: death, ICU admission, need for invasive mechanical ventilation or vasopressor support in patients admitted with pneumococcal pneumonia. METHODS: A five year retrospective study of patients admitted for pneumococcal pneumonia. Patients were stratified based on admission data and assigned to low-, intermediate-, and high-risk classes for each score. Results were obtained comparing low versus non-low risk classes. RESULTS: We studied 142 episodes of hospitalization with 2 deaths and 10 patients needing mechanical ventilation and vasopressor support. The majority of patients were classified as low risk by all scores - we found high negative predictive values for all adverse events studied, the most negative value corresponding to the SCAP score. The more recent scores showed better accuracy for predicting ICU admission and need for ventilation or vasopressor support (mostly for the SCAP score with higher AUC values for all adverse events). CONCLUSIONS: The rate of all adverse outcomes increased directly with increasing risk class in all scores. The new gravity scores appear to have a higher discriminatory power in all adverse events in our study, particularly, the SCAP score.

Effects of immature cashew nut-shell liquid (Anacardium occidentale) against oxidative damage in Saccharomyces cerevisiae and inhibition of acetylcholinesterase activity.

The cashew tree (Anacardium occidentale) represents one of the major cheapest sources of non-isoprenoid phenolic lipids, which have a variety of biological properties: they can act as molluscicides, insecticides, fungicides, have anti-termite properties, have medicinal applications, and demonstrate antioxidant activity in vitro. Immature cashew nut-shell liquid (iCNSL) is a unique natural source of unsaturated long-chain phenols. Their use has stimulated much research in order to prepare drug analogues for application in several fields. The objective of the present study was to determine whether iCNSL has antioxidant properties when used in strains of the yeast Saccharomyces cerevisiae and to measure the inhibitory activity of acetylcholinesterase. The constituents were identified using thin-layer chromatography, gas chromatography-mass spectrometry, Fourier transform infrared spectroscopy, and (1)H and (13)C nuclear magnetic resonance. The iCNSL contains anacardic acid, cardanol, cardol, and 2-methyl cardol. Immature cashew nut oil contains triacylglycerols, fatty acids, alkyl-substituted phenols, and cholesterol. The main constituents of the free fatty acids are palmitic (C(16:0)) and oleic acid (C(18:1)). iCNSL has excellent protective activities in strains of S. cerevisiae against oxidative damage induced by hydrogen peroxide and inhibits acetylcholinesterase activity. iCNSL may have an important role in protecting DNA against damage induced by reactive oxygen species, as well as hydrogen peroxide, generated by intra- and extracellular mechanisms.

Studies on prevalence of Strongyloides infection in Holambra and Maceió, Brazil, by the agar plate faecal culture method.

Prevalence of Strongyloides stercoralis infection in three areas of Brazil was surveyed by a recently developed faecal culture method (an agar plate culture). The Strongyloides infection was confirmed in 11.3% of 432 subjects examined. The diagnostic efficacy of the agar plate culture was as high as 93.9% compared to only 28.5% and 26.5% by the Harada-Mori filter paper culture and faecal concentration methods, when faecal samples were examined simultaneously by these three methods. Among the 49 positive samples, about 60% were confirmed to be positive only by the agar plate culture. These results indicate that the agar plate culture is a sensitive new tool for the correct diagnosis of chronic Strongyloides infection.

Implementation of the homeless families program: 2. Characteristics, strengths, and needs of participant families.

The characteristics and needs of homeless families participating in a large-scale services-enriched housing program are examined. Although not a representative sample, participants constitute one of the largest subsets of homeless families in the literature. Moreover, the sample, which encompasses nine sites, is focused on families with multiple problems who have been recurrently homeless. Differing constellations of needs and implications for service delivery are explored.

Impaired balance of interleukin-4 and interferon-gamma production in infections with Schistosoma mansoni and intestinal nematodes.

In chronic infection with Schistosoma mansoni, IL-4 and IFN-gamma are co-modulated in opposite directions. This was shown when testing sera and cell culture supernatants from 31 Brazilian patients with schistosomiasis before, and three months after treatment with praziquantel. Thorough examinations were undertaken to account for polyparasitism with intestinal nematode infections involving tissue migrating larval stages that may induce analogous changes. Controls free of S. mansoni included a group (n = 17) matching the schistosomiasis patients' parasitation by intestinal nematodes and a group (n = 16) free of helminths other than T. trichiura. Serum IL-4 was greater than 20 pg/ml in 81% of schistosomiasis patients but in only 35 and 25%, respectively, of controls with and without intestinal nematodes. IL-4 data correlated inversely with the mitogen-induced IFN-gamma synthesis. Generation of IL-4 in response to phorbol esters was related to the intensity of infection by schistosomes and intestinal nematodes. The parasitological status three months after therapy with either praziquantel or mebendazole revealed a dichotomy: whereas the ratio of IFN-gamma to IL-4 generated in vitro was identical in uninfected controls and in patients who cleared the parasites, failure to eliminate the parasites was associated with lower IFN-gamma/IL-4 ratios generated in vitro.