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Rocha C.B.,University of Jose do Rosario Vellano
Jornal brasileiro de nefrologia : 'orgão oficial de Sociedades Brasileira e Latino-Americana de Nefrologia | Year: 2010

Maximal inspiratory and expiratory pressures (PImax and PEmax) are used to assess the integrity of respiratory muscles by measuring their strength. The aim of this study was to assess the immediate influence of hemodialysis (HD) on respiratory muscle strength by measuring PImax and PEmax, investigating the integrity of that musculature and/or the presence of muscular weakness. A prospective, crosssectional study was carried out on a convenience sample of 35 patients with chronic kidney disease (26 men and 9 women; mean age, 51.7 ± 14.7 years) at the Nephrology Division of the Hospital Universitário Alzira Vellano, in the city of Alfenas, in the state of Minas Gerais, Brazil. Patients had their PImax and PEmax taken in the seated position (at 90°) by using a digital manovacuometer (MVD 300®) attached to a notebook for reading and recording data obtained before and after the HD session. Both PImax and PEmax were lower than the values predicted for pre- and post-HD (p < 0.0001). Comparing the values obtained pre-HD and post- HD, PImax showed a slight improvement (p = 0.0420), evidenced only in patients with pre-HD values below 60 cmH2O (Wilcoxon; p = 0.0480). Post-HD PEmax did not differ from the pre-HD measure (p = 0.4987). The CKD patients showed a serious impairment of their respiratory muscle function, and only one isolated HD session could not significantly improve their maximum respiratory pressures. A slight improvement in the inspiratory strength was observed in patients whose PImax was lower than 60 cm-H2O before the procedure. Source

Rabelo F.H.S.,Escola Superior de Agricultura Luiz de Queiroz ESALQ | de Rezende A.V.,University of Jose do Rosario Vellano | Rabelo C.H.S.,Sao Paulo State University | Amorim F.A.,Institute Ciencias Agrarias UNIFENAS
Revista Ciencia Agronomica | Year: 2013

The aim was to evaluate levels and forms of application of potassium on the agronomic and alimentary characteristics of corn used for silage. The experiment was carried out at UNIFENAS during the agricultural year of 2008/2009. Fertilization at planting and sowing was performed manually using 120kg ha-1 P2O5 and 30kg ha-1 N, the potassium being applied according to the treatments. The experimental design used was of randomized blocks in a 4 x 2 factorial arrangement with four replications, using four amounts (0; 60; 90 and 120 kg ha-1) and two formsof application of K (100% at planting and 50% at sowing+50% coverage). The interaction between the factors of amount and forms of application of the potassium was not significant (p>0.05) for the variables studied: the main effect of each factor was then investigated. There was no effect (p>0.05) for K levels on the percentage of drymatter (DM) and bedded plants, DM and grain productivity and grain participation in the mass. The highest grain yield was obtained when using K at planting (p<0.05). High doses of potassium did not produce changes in DM, percentage of bedded plants, DM production, grain yield or grain percentage of the plant. The different levels and forms of application of potassium do not alter the alimentary characteristics of corn silage. Source

Fortes-Silva R.,University of Jose do Rosario Vellano | Rosa P.V.,Federal University of Lavras | Zamora S.,University of Murcia | Sanchez-Vazquez F.J.,University of Murcia
Physiology and Behavior | Year: 2012

Animals do not eat whatever food item they encounter, but choose different foods that best match their requirements. Fish exhibit such "nutritional wisdom" and adapt their feeding behaviour and food intake according to their needs and the nutritional properties of diets. In this paper, we tested the ability of Nile tilapia to select between diets with a balanced or unbalanced composition of essential amino acids. To this end, three different diets were prepared: a gelatine based diet (D 1), a gelatine diet supplemented with three essential amino acids (EAA, l-tryptophane, l-methionine, l-threonine) (D 2), and a diet containing only cellulose and the three crystalline EAA (D 3). In addition, the putative role of both orosensorial factors (using pellets vs capsules) and social interactions (single vs groups of ten fish) was investigated. To this end, a total of 68 male tilapia of about 141±48g (mean±S.D.) were challenged, individually or in groups, to select between D 1 vs D 2 using pellets dispensed by self-feeders (exp. 1). In another experiment (exp. 2), 11 individual fish were challenged to select encapsulated diets with non flavour or smell proprieties (D 1 vs D 2), and in exp. 3 fish were challenged to self-supplementation in EAA (D 1 vs D 3). The results showed the ability of tilapia to avoid the EAA-deficient diet, choosing 82.2% D 2 in the case of individual fish, and 80.8% D 2 in the case of fish groups. Dietary selection was not directly driven by the orosensorial characteristics of food, since tilapia sustained a higher preference for D 2 when fed with encapsulated diets. Finally, in exp. 3 tilapia self-supplemented the EAA deficiency by selecting a synchronised combination of D 1 and D 3 that matched their nutritional requirements. These findings highlighted the capacity of fish to make dietary selection based on the EAA content, which should be considered when discussing food intake regulation mechanisms, and diet formulation and supplementation with EAA. © 2011 Elsevier Inc. Source

Saude A.V.,Federal University of Lavras | De Menezes F.S.,Federal University of Lavras | Freitas P.L.S.,University of Jose do Rosario Vellano | Rabelo G.F.,Federal University of Lavras | Braga Jr. R.A.,Federal University of Lavras
Journal of the Optical Society of America A: Optics and Image Science, and Vision | Year: 2012

Biospeckle is a technique whose purpose is to observe and study the underlying activity of some material. It has its roots in optical physics, and its first step is an image acquisition process that produces a video sequence of the reflection of a laser. The video content can be analyzed to have an interpretation of the activity of the observed material. The literature on this subject presents several different measures for analyzing the video sequence. Three of the most popular measures are the generalized difference (GD), the weighted generalized difference (WGD), and Fujii's method. These measures have drawbacks such as high computation time or limited visual quality of the results. In this paper, we propose (i) an alternative O(n) algorithm for the computation of the GD, (ii) an alternative measure based on the GD, (iii) an alternative measure based on the WGD, and (iv) a generalized definition of the Fujii's method with better visual quality. We discuss the similarities between the new measures and the existent ones, showing when they are applicable. We prove the gain in time computation. The proposed measures will help researchers to gain time during their research and to be able to develop faster tools based on biospeckle application. © 2012 Optical Society of America. Source

Braga A.S.C.,Hospital Joao Paulo II | Toledo Jr. A.C.C.,University of Jose do Rosario Vellano
Revista da Sociedade Brasileira de Medicina Tropical | Year: 2013

Introdution: A major concern with the visceral leishmaniasis (VL) is its high lethality rate, even with proper treatment. Low age, prior malnutrition, disease duration prior to diagnosis, severe anemia, fever for more than 60 days, diarrhea and jaundice are known poor prognostic factors. The goals of this study are to describe the clinical and laboratory characteristics of VL among children under 12 years of age and to identify the factors associated with VL poor outcome. Methods: Two hundred and fifty children under 12 years of age with confirmed VL admitted to Hospital João Paulo II (FHEMIG), Belo Horizonte, Brazil, between January 2001 and December 2005 were evaluated retrospectively. The primary outcome was the poor clinical evolution: sepsis, and/or pneumonia, and/or urinary tract infection, and/or of bleeding (expect epistaxis), and/or severe neutropenia (neutrophil < 500 cells/mm3). Odds ratio (crude and adjusted) and its 95% confidence interval for each variable were calculated. Values less than 0.05 were considered significant. Results: Average age was 3.3 years (3.6 months-11.6 years), 71.2% were younger than 5 years and 47.2% lived in Metropolitan Area of Belo Horizonte. The mean fatality rate was 3.6%. Sixty-six (26.4%) patients presented poor evolution. After a multivariate analysis, age <18 months, abnormal respiratory physical examination on hospital admission, and platelets <85,000/mm3 remained associated with increased chance of poor evolution. Conclusions: The results suggest that patients aged between 12 and 18 months, with platelet counts bellow 85,000/mm3, and respiratory abnormalities at admission should be considered potentially severe. Source

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