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Search Results: 1 - 10 of 9692 matches for " Osmar Angelo;Barros "
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Fitase em ra??es para tilápia-do-nilo na fase de crescimento
Bock, Claudio Luiz;Pezzato, Luiz Edivaldo;Cantelmo, Osmar Angelo;Barros, Margarida Maria;
Revista Brasileira de Zootecnia , 2007, DOI: 10.1590/S1516-35982007000700001
Abstract: this research was carried out to compare the effect of phytase on performance, in the incorporation and excretion phosphorus in nile tilápia. four diets were used: one standard (contol), composed by 3,200 de kcal ed/kg of ration and 30.0% cp and supplemented with phosphorus (4.0% of dicalcium phosphate), considering the treatment control, and others three, without phosphorus supplementation, with different phytase levels (1,000, 1,500, and 2,000 uf/kg), with four replication, per a period of 82 days. circular tanks of fiber glass, with constant flow and aeration were used. the results demonstrated that the use of phytase in diets for fish production can reduce the levels of inorganic phosphorus in the diets and minimizing the impacts caused by phosphorus in the production system and in the natural environment and also can improve the productivity, increasing the amount of feed to be supplied and, consequently, facilitating the increase of biomass of fish to be used per production area.
Circumstantial Indications Emitted by the Teacher during Discursive Activity  [PDF]
Carlos Eduardo Laburú, Osmar Henrique Moura da Silva, Marcelo Alves Barros, Andreia de Freitas Z?mpero
Creative Education (CE) , 2017, DOI: 10.4236/ce.2017.88095
This study makes use of a reading of Prieto’s semiotics with the aim of shedding light on semiotic elements that occur during the discursive process in the classroom. Taking as reference an overview of this author’s theories in the context of science education, the paper focuses on the semiotic element of circumstantial indications. Circumstantial indications are a collateral and not always explicit type of sign in the teacher’s communication that assist the meaning of messages conveyed by signals. Compared with indications, signals are signs transmitted explicitly and openly that constitute the main axis of the discourse. In the course of classroom communication, teachers emit circumstantial indications in parallel with the transmitted signals. The signals refine the understanding of the messages of the scientific concepts being taught in order to make them more meaningful. This study investigates one Physics teacher’s class in a lab in which an empirical activity is guided at various moments through discursive activity based on problem-solving methodology. The paper identifies and qualifies some types of circumstantial indications emitted by the teacher, contextualizing their role in the discursive process during teaching.
Profile of Patients Treated in Outpatient Vestibular Rehabilitation at a Hospital in São Paulo  [PDF]
Bárbara Vieira Coró, Miguel Angelo Hyppolito, Camila Giacomo Carneiro Barros, Ana Paula do Rego André
International Journal of Clinical Medicine (IJCM) , 2019, DOI: 10.4236/ijcm.2019.101002
Abstract: Introduction: Currently it is very common that the search for diagnosis and treatment for curing diseases can cause vertigo or dizziness. Objective: This study sought to characterize the profile of patients seen in the clinic for vestibular rehabilitation in a tertiary hospital in the last 10 years. Methods: Survey questionnaires of patients with dizziness. Results: The prevalence of treated subjects was female 65.3% (N = 439). The average age was 54.9 years old. Dizziness type roundabout was more prevalent 33.04% (N = 222). Tinnitus occurred in 58.33% of the population. The time of most observed dizziness was less than 5 years 70.68% (N = 475). Neurovegetative symptoms appeared in 63.98% (N = 430) of the population. The bilateral normal hearing was more standard 35.26% (N = 237). The topographic diagnosis of peripheral origin was the most usual 65.47% (N = 440). Conclusion: The peripheral otoneurologic involvement was more prevalent in this population, affecting more women at an average age of 54.9 years old. The most prevalent symptoms were vertigo, nausea, tachycardia, sweating, vomiting and tinnitus, characterizing the peripheral vestibular impairment. The time of dizziness was less than five years. Audiological standard normal curve was predominant and the symptom of tinnitus was the most reported. The most prevalent comorbidity was Hypertension.
Diminui??o do teor de óxido de cr?mio (III) usado como marcador externo
Bremer Neto, Hermann;Graner, Celso Augusto Fessel;Pezzato, Luiz Edivaldo;Padovani, Carlos Roberto;Cantelmo, Osmar Angelo;
Revista Brasileira de Zootecnia , 2003, DOI: 10.1590/S1516-35982003000200001
Abstract: the objective of this study was to reduce the level of the biological marker cr2o3 in animal diets, due to the sensibility of the sdiphenylcarbazide spectrophotometric method for chromium determination in feces, recently developed. six levels of marker, chromium (iii) oxide (0.01% - 0.02% - 0.03% - 0.05% - 0.1% and 0.2%), were incorporated into isoproteic and isoenergetic diets, for the apparent digestibility assay of the "piau?u" (leporinus macrocephalus), in a design of entirely randomized groups. feces were collected during sixteen days. the statistical analysis did not show significant differences in the apparent digestibility of the proteinic fraction due to the concentration levels of the marker incorporated into the diets and the collection days. consequently, there is nothing to stop us from reducing cr2o3 rate to at least 0.01% in these digestibility assays: spectrophotometry of sdiphenilcarbazide allows us to determine this level or even smaller levels in an accurate, simple, and quick manner.
Expression of Grapevine leafroll-associated virus 3 coat protein gene in Escherichia coli and production of polyclonal antibodies
Fajardo, Thor V.M.;Barros, Danielle R.;Nickel, Osmar;Kuhn, Gilmar B.;Zerbini, F. Murilo;
Fitopatologia Brasileira , 2007, DOI: 10.1590/S0100-41582007000600007
Abstract: grapevine leafroll-associated virus 3 (glrav-3), the main viral species of the grapevine leafroll complex, causes yield and quality reduction in grapes (vitis spp.). the coat protein gene was rt-pcr-amplified from total rna extracted from infected grapevine leaves and the amplified fragment was cloned and completely sequenced. the fragment was subsequently subcloned into the prset-c expression vector. the recombinant plasmid was used to transform escherichia coli bl21:de3 and express the capsid protein. the coat protein, fused to a 6 his-tag, was purified by affinity chromatography using an ni-nta resin. the identity of the purified protein was confirmed by sds-page and western blot. the in vitro-expressed protein was quantified and used for rabbit immunizations. the antiserum was shown to be sensitive and specific for the detection of glrav-3 in grapevine extracts in western blot and das-elisa assays, with no unspecific or heterologous reactions against other non-serologically related viruses being observed.
Multimodos e múltiplas Representa??es, aprendizagem significativa e subjetividade: três referenciais conciliáveis da educa??o científica
Laburú, Carlos Eduardo;Barros, Marcelo Alves;Silva, Osmar Henrique Moura da;
Ciência & Educa??o (Bauru) , 2011, DOI: 10.1590/S1516-73132011000200014
Abstract: the research line in multi-modal and multiple representations is being currently inspiring instruction of actions in the scientific education. starting by the foundations that justify a didactic direction in the light of theses references, this work tries to show that there is compatibility of their foundations with the theory of the significant learning of ausubel, and with the lifted up subjects for the researches that indicate the need to consider the students' subjective diversity present in a classroom. essentially, we tried to argue that the promotion of a teaching through multiple and multi-modal representation is consistent with the plural atmosphere of the existent subjectivities in a classroom and with a significant learning.
Disponibilidade no solo, estado nutricional e recomenda??o de enxofre para o arroz irrigado
Carmona, Felipe de Campos;Conte, Osmar;Fraga, Thiago Isquierdo;Barros, Thiago;Pulver, Edward;Anghinoni, Ibanor;
Revista Brasileira de Ciência do Solo , 2009, DOI: 10.1590/S0100-06832009000200012
Abstract: the depress?o central region in the state of rio grande do sul, brazil, is characterized by large areas of sandy soil that were intensively cultivated with flooded rice in the last decades. currently, the high rice yields, along with the low organic matter content of these soils and the fertilization practices are favorable conditions for the appearance of sulfur (s) deficiency. with the purpose of determining sulfur distribution in the soil profile and recommending levels of this element for flooded rice based on the calibration curve and crop response to sulfur fertilizer, a study was carried out at 12 sites in the depress?o central region during the 2004/2005 and 2005/2006 growing seasons. sulfur availability in the soil profile did not correlate with organic matter and clay content. sulfur content in plant tissue increased with soil sulfur availability and with soil-applied sulfur rates, but did not reach the sufficiency range determined by the interpretation system used in brazil. the critical content determined in the soils of the depress?o central in the state of rio grande do sul is higher than the one currently used in southern brazil. the sulfur rates for the maximum technical efficiency (36 kg ha-1) and economic efficiency (26 kg ha-1) for flooded rice on soils with sulfur availability below the critical level resulted in similar grain yields.
Efeito da qualidade fisiológica das sementes e da densidade de semeadura sobre o rendimento de gr?os e qualidade industrial em arroz
H?fs, Alberto;Schuch, Luis Osmar Braga;Peske, Silmar Teichert;Barros, Antonio Carlos Souza Albuquerque;
Revista Brasileira de Sementes , 2004, DOI: 10.1590/S0101-31222004000200008
Abstract: an experiment was conducted in the centro agropecuário da palma, at the universidade federal de pelotas (cap/ufpel) with the objective of evaluating the effect of rice seed physiological quality and seeding rate upon grain yield and grain integrity percentage. it was tested in a factorial combination in two crop years (2000/2001 and 2001/2002), two physiological quality levels and different seeding rates. seed lots of the cultivar irga 417 were obtained from official seed growers of rio grande do sul state, brazil. seeding rates were 80, 140 and 200 kg per hectare in 2000/2001 and 80 and 150 kg in 2001/2002. the use of high physiological quality level seed lots propitiated yield increases of 8,2% and 9,0% in 2000/2001 and 2001/2002, corresponding to 622 kg ha-1 and 660 kg ha-1, respectivelly. otherwise, different seeding rates did not affect grain yield.the use of lots of low seed physiological quality caused uneven maturation, reduction in 1000 grain weight. on the other hand, grain integrity percentage and index of harvesting were not affected. the variation in the seeding rate did not affect maturation uniformity, grain integrity yield and weight of 1000 grains.
Qualidade fisiológica e produtividade de sementes de soja
Scheeren, Bruno Ricardo;Peske, Silmar Teichert;Schuch, Luis Osmar Braga;Barros, Antonio Carlos Albuquerque;
Revista Brasileira de Sementes , 2010, DOI: 10.1590/S0101-31222010000300004
Abstract: there is currently intense research on obtaining information about higher soybean productivity and, in this context, using high quality seeds is extremely important to farmers. with the objective of evaluating the effects of soybean seed vigor on productivity, seed lots with high and low vigor were sown at three different densities: the certified germination %, the certified germination % plus 15% as a correction factor and, from the result of field emergence. the seedling population after emergence was not changed so that the field condition that farmers face when sowing variable quality seeds could be reproduced. during plant development, the following parameters were evaluated: initial stand, plant height at 21 and 75 days after sowing, number of pods and seeds per plant, weight of one thousand seeds, and yield/area. the results showed that: the yield/area of high vigor seed lots is on average up to 9% higher; the seedlings from high vigor seeds are taller at 21 days after sowing.
Emergência e crescimento de plantulas de arroz em resposta à qualidade fisiológica de sementes
H?fs, Alberto;Schuch, Luis Osmar Braga;Peske, Silmar Teichert;Barros, Antonio Carlos Souza Albuquerque;
Revista Brasileira de Sementes , 2004, DOI: 10.1590/S0101-31222004000100014
Abstract: this study was conducted in the experimental area of the plant pathology department of the agronomy faculty "eliseu maciel" of the federal university of pelotas, in 2001 and 2002 with the objective of evaluating the effect of using seeds with different vigor levels on emergence and initial seedling growth. seeds of two vigor levels were tested, and the higher vigor had more than 95% germination and the lower vigor level germination was between 80 and 85%. those lots were obtained from officially documented seed growers of rio grande do sul state, brazil. the use of low vigor seeds caused a reduction in field emergence, delayed and unequal emergence and continued to act after emergence on isolated plants, affecting biomass dry weight and foliar area. thus it was an advantage to use seeds of higher vigor level due to the production of plants with a big initial size, that consequently, propitiated bigger growth crop rate. differences in crop growth rate decreased during the growing period because of the bigger relative growing rate shown by plants from low vigor seeds, although there was no variation in the rate of liquid assimilation. this behavior led to a reduction in the initial differences of biomass yield by isolated plants of irrigated rice, derived from seeds of different vigor levels.
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