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Search Results: 1 - 10 of 543195 matches for " C.M.M.;Motta "
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Beneficial effects of exercise training (treadmill) on insulin resistance and nonalcoholic fatty liver disease in high-fat fed C57BL/6 mice
Marques, C.M.M.;Motta, V.F.;Torres, T.S.;Aguila, M.B.;Mandarim-de-Lacerda, C.A.;
Brazilian Journal of Medical and Biological Research , 2010, DOI: 10.1590/S0100-879X2010007500030
Abstract: c57bl/6 mice develop signs and symptoms comparable, in part, to the human metabolic syndrome. the objective of the present study was to evaluate the effects of exercise training on carbohydrate metabolism, lipid profile, visceral adiposity, pancreatic islet alterations, and nonalcoholic fatty liver disease in c57bl/6 mice. animals were fed one of two diets during an 8-week period: standard (sc, n = 12) or very high-fat (hf, n = 24) chow. an exercise training protocol (treadmill) was then established and mice were divided into sc and hf sedentary (sc-sed, hf-sed), exercised groups (sc-ex, hf-ex), or switched from hf to sc (hf/sc-sed and hf/sc-ex). hf/hf-sed mice had the greatest body mass (65% more than sc/sc-sed; p < 0.0001), and exercise reduced it by 23% (p < 0.0001). hepatic enzymes alp (+80%), alt (+100%) and ast (+70%) were higher in hf/hf mice than in matched sc/sc. plasma insulin was higher in both the hf/hf-sed and hf/sc-sed groups than in the matched exercised groups (+85%; p < 0.001). pancreatic islets, adipocytes and liver structure were greatly affected by hf, ultimately resulting in islet β-cell hypertrophy and severe liver steatosis. the hf group had larger islets than the sc/sc group (+220%; p < 0.0001), and exercise significantly reduced liver steatosis and islet size in hf. exercise attenuated all the changes due to hf, and the effects were more pronounced in exercised mice switched from an hf to an sc diet. exercise improved the lipid profile by reducing body weight gain, visceral adiposity, insulin resistance, islet alterations, and fatty liver, contributing to obesity and steatohepatitis control.
Interferência de herbicidas, associados a um análogo de brassinosteroide, no aparato fotossintético de mudas de Eucalyptus grandis
Silva, C.M.M.;Gomes, M.M.A.;Freitas, S.P.;
Planta Daninha , 2009, DOI: 10.1590/S0100-83582009000400017
Abstract: the effects of the application of imazapyr and glyphosate and their interactions with a spirostanic analogue of castasterone (bb16), on the growth of seedling clones of eucalyptus grandis were evaluated. applications of bb16 (at concentrations of 0.08 and 0.16 mg l-1: bb16 (-) and bb16 (+) respectively), and of imazapyr (0.750 kg ha-1) and glyphosate (1.440 kg ha-1 ) were carried out. the treatments were the control, bb16 (-), bb16 (+), glyphosate, imazapyr, besides the hormone-herbicide interaction, at an interval of 12 h between the bb16 and each herbicide application and vice versa. chlorophyll a fluorescence was measured daily on the third completely - expanded leaf, as well as height, diameter and dry matter of the shoot (dms) and roots (dmr). the control, bb16 (-) and bb16 (+) differed from the other dms treatments; however, for dmr, height and diameter did not show any significant difference among the treatments. the fluorescence parameter means obtained for the herbicide application treatments were higher than the control, bb16 (-) and bb16 (+) until the seventh day after treatment (dat). the seedlings that received the glyphosate application associated, or not, to bb16(-) or bb16(+), exhibited necrosis before the seventh day, while the seedlings that received imazapyr associated to bb16 showed only necrotic lesion at the extremity of the lateral branches. the herbicides analyzed caused deleterious effects on the photosynthetic apparatus of e. grandis. however, since the seventh dat, the seedlings that received the imazapyr application (with or without bb16) did not differ from the control, bb16 (-) and bb16 (+) treatments, in relation to the fluorescence parameters.
Chemical absorption of H2S for biogas purification
Horikawa M.S.,Rossi F.,Gimenes M.L.,Costa C.M.M.
Brazilian Journal of Chemical Engineering , 2004,
Abstract: This work presents an experimental study of purification of a biogas by removal of its hydrogen sulphide (H2S) content. The H2S was removed by means of chemical absorption in an iron-chelated solution catalyzed by Fe/EDTA, which converts H2S into elemental sulphur (S). Preparation of the catalyst solution and the results of biogas component absorption in the catalyst solution (0.2 mol/L) are presented. These results are compared with those for physical absorption into pure water under similar conditions. Experimental results demonstrate that, under the same experimental conditions, a higher percentage of H2S can be removed in the catalytic solution than in water. In a continuous counter current using adequate flow-rate phases contact at room temperature and low gas pressure, the results demonstrate that is possible to totally remove the H2S from the biogas with the prepared catalytic solution.
Impact of two forest roads upon wildlife after a road pavement change in a coastal area in the center of Portugal
Petronilho, J.M.S.,Dias, C.M.M.
Wildlife Biology in Practice , 2005,
Abstract: The impact of traffic on wild vertebrate populations in two forest roads was assessed. These two roads cross the Perímetro Florestal das Dunas e Pinhais de Mira, located in the littoral centre of Portugal. One of the roads was paved with asphalt. The other was already partially paved but later on it became completely paved with asphalt. These new pavements considerably contributed to the increase of traffic in these roads. Between September 1996 and August 1997 the one-way transepts (13 km of forest roads) were reviewed 10 times a month using a vehicle at a 20-40 Km/hour speed. Vertebrate road casualties (n = 831) included 46 identified species and 7 nonidentified individuals. Amphibians presented the highest values for road casualties (81%), followed by birds (9%), reptiles (6%) and mammals (4%). The highest mortality rates occurred between November and March and in the 2nd, 5th and 7th kilometres. Amphibians were the most affected group. The common toad Bufo bufo, presented the highest mortality values (49%), constituting nearly half the road casualties registered during the study period. In a short-term period, this mortality might produce negative effects upon longevity and reproduction of some vertebrate species.
Manejo de plantas daninhas no plantio direto da soja (Glycine max) sobre o milheto (Pennisetum maximum)
Freitas, S.P.;Rodrigues, J.C.;Silva, C.M.M.;
Planta Daninha , 2006, DOI: 10.1590/S0100-83582006000300009
Abstract: the aim of this study was to evaluate different types of management methods under soybean no-tillage cultivated over pearl millet straw (managed with cutting-roller or glyphosate). two experiments were carried out with two soybean cultivars (conquista and celeste) and post-emergence application of the formulated mixture of the herbicides fluazifop-p-butyl + fomesafen (0, 100+125 and 200+250 g ha-1 ). conjoined variance analysis of the experiments showed predominance of different weed species over pearl millet management with the greatest infestation of the former being verified under cutting-roller management associated to control absence in the soybean crop. the fluazifop-p-butyl + fomesafen dose may be reduced for weed control in soybean provided it is preceded by glyphosate application to form pearl millet straw. under this condition, greater weed control was verified in relation to mechanic management (cutting-roller), resulting in greater crop yield, due to the greater amount of pod per plant and grain per pod.
Variability of Vernier acuity measurements in untrained subjects of different ages
Abbud, C.M.M.;Cruz, A.A.V.;
Brazilian Journal of Medical and Biological Research , 2002, DOI: 10.1590/S0100-879X2002000200011
Abstract: the vernier acuity of 50 normal untrained subjects (20 males and 30 females) was measured by the method of adjustment. subjects were divided into five age ranges with 10 subjects in each age group: 5-10, 11-20, 21-30, 31-40, and 41-50 years. all subjects had normal visual acuity (20/20) and volunteered to participate in the experiment. children were selected from a local school and adults recruited from the technical staff of the department of ophthalmology of the school of medicine. vernier acuity was higher in adults compared to children. intraindividual variability was high and it was estimated that for most individuals of all age groups a range of 100 to 700 trials was necessary to obtain a mean with a precision of 10%. these results suggest that vernier acuity variability is an obstacle to its use in clinical settings.
Variability of Vernier acuity measurements in untrained subjects of different ages
Abbud C.M.M.,Cruz A.A.V.
Brazilian Journal of Medical and Biological Research , 2002,
Abstract: The Vernier acuity of 50 normal untrained subjects (20 males and 30 females) was measured by the method of adjustment. Subjects were divided into five age ranges with 10 subjects in each age group: 5-10, 11-20, 21-30, 31-40, and 41-50 years. All subjects had normal visual acuity (20/20) and volunteered to participate in the experiment. Children were selected from a local school and adults recruited from the technical staff of the Department of Ophthalmology of the School of Medicine. Vernier acuity was higher in adults compared to children. Intraindividual variability was high and it was estimated that for most individuals of all age groups a range of 100 to 700 trials was necessary to obtain a mean with a precision of 10%. These results suggest that Vernier acuity variability is an obstacle to its use in clinical settings.
Effect of metabolic control on parathyroid hormone secretion in diabetic patients
Paula, F.J.A.;Lanna, C.M.M.;Shuhama, T.;Foss, M.C.;
Brazilian Journal of Medical and Biological Research , 2001, DOI: 10.1590/S0100-879X2001000900006
Abstract: the metabolic derangement caused by diabetes mellitus may potentially affect bone mineral metabolism. in the present study we evaluated the effect of diabetes metabolic control on parathyroid hormone (pth) secretion during stimulation with edta infusion. the study was conducted on 24 individuals, 8 of them normal subjects (group n: glycated hemoglobin - hba1c = 4.2 ± 0.2%; range = 3.5-5.0%), 8 patients with good and regular metabolic control (group g-r: hba1c = 7.3 ± 0.4%; range = 6.0-8.5%), and 8 patients with poor metabolic control (group p: hba1c = 12.5 ± 1.0%; range: 10.0-18.8%). blood samples were collected at 10-min intervals throughout the study (a basal period of 30 min and a 2-h period of edta infusion, 30 mg/kg body weight) and used for the determination of ionized calcium, magnesium, glucose and intact pth. basal ionized calcium levels were slightly lower in group p (1.19 ± 0.01 mmol/l) than in group n (1.21 ± 0.01 mmol/l) and group g-r (1.22 ± 0.01 mmol/l). after edta infusion, the three groups presented a significant fall in calcium, but with no significant difference among them at any time. basal magnesium levels and levels determined during edta infusion were significantly lower (p<0.01) in group p than in group n. the induction of hypocalcemia caused an elevation in pth which was similar in groups n and g-r but significantly higher than in group p throughout the infusion period (+110 min, n = 11.9 ± 2.1 vs g-r = 13.7 ± 1.6 vs p = 7.5 ± 0.7 pmol/l; p<0.05 for p vs n and g-r). the present results show that pth secretion is impaired in patients with poorly controlled diabetes.
Effect of metabolic control on parathyroid hormone secretion in diabetic patients
Paula F.J.A.,Lanna C.M.M.,Shuhama T.,Foss M.C.
Brazilian Journal of Medical and Biological Research , 2001,
Abstract: The metabolic derangement caused by diabetes mellitus may potentially affect bone mineral metabolism. In the present study we evaluated the effect of diabetes metabolic control on parathyroid hormone (PTH) secretion during stimulation with EDTA infusion. The study was conducted on 24 individuals, 8 of them normal subjects (group N: glycated hemoglobin - HbA1C = 4.2 ± 0.2%; range = 3.5-5.0%), 8 patients with good and regular metabolic control (group G-R: HbA1C = 7.3 ± 0.4%; range = 6.0-8.5%), and 8 patients with poor metabolic control (group P: HbA1C = 12.5 ± 1.0%; range: 10.0-18.8%). Blood samples were collected at 10-min intervals throughout the study (a basal period of 30 min and a 2-h period of EDTA infusion, 30 mg/kg body weight) and used for the determination of ionized calcium, magnesium, glucose and intact PTH. Basal ionized calcium levels were slightly lower in group P (1.19 ± 0.01 mmol/l) than in group N (1.21 ± 0.01 mmol/l) and group G-R (1.22 ± 0.01 mmol/l). After EDTA infusion, the three groups presented a significant fall in calcium, but with no significant difference among them at any time. Basal magnesium levels and levels determined during EDTA infusion were significantly lower (P<0.01) in group P than in group N. The induction of hypocalcemia caused an elevation in PTH which was similar in groups N and G-R but significantly higher than in group P throughout the infusion period (+110 min, N = 11.9 ± 2.1 vs G-R = 13.7 ± 1.6 vs P = 7.5 ± 0.7 pmol/l; P<0.05 for P vs N and G-R). The present results show that PTH secretion is impaired in patients with poorly controlled diabetes.
Efeitos de herbicidas na atividade fotossintética e no crescimento de abacaxi (Ananas comossus)
Catunda, M.G.;Freitas, S.P.;Oliveira, J.G.;Silva, C.M.M.;
Planta Daninha , 2005, DOI: 10.1590/S0100-83582005000100014
Abstract: weed management in pineapple crop is an indispensable practice, with chemical control being increasingly used since it allows efficient control without injury to the roots. since little literature is available on herbicide interference in crop growth, the aim of this work was to evaluate the effects of the herbicides amicarbazone and diuron + paraquat applied directly on the plants. the herbicide effects were measured by the fluorescence rate of chlorophyll a and chlorophyll a, chlorophyll b and carotenoid contents, and by evaluating the height and dry biomass of the aerial part (wpa). the application of amicarbazone reduced the photosynthetic pigment contents although the same interference in height and wpa variables was not observed; however, diuron + paraquat herbicide caused the death of the pineapple plants, indicating a reduction in chlorophyll a and b and carotenoids rendering it impossible to measure the height and wpa values (at 120 dat) as a result of the death of the plants at 30 dat, showing a certain amicarbazone selectivity for pineapple crop.
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