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Search Results: 1 - 10 of 34652 matches for " Julio Cezar Franchini dos;Torres "
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Matéria seca, carbono e nitrogênio de raízes de soja e milho em plantio direto e convencional
Bordin, Ivan;Neves, Carmen Silvia Vieira Janeiro;Medina, Cristiane de Conti;Santos, Julio Cezar Franchini dos;Torres, Eleno;Urquiaga, Segundo;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008001200020
Abstract: the objective of this work was to examine whether soil tillage systems affect the distribution and accumulation of dry matter (dm), carbon (c) and nitrogen (n) of root systems of soybean (glycine max) and corn (zea mays) in a clayey typic haplorthox. volumetric rings were used for root sampling down to 1 m depth. the distribution in depth and accumulation of dm, c and n of soybean and corn roots were not affected by soil tillage systems. root length density was 0.7-1.4 cm cm-3 for soybean and 1.2-1.6 cm cm-3 for corn in the 0-0.10 m layer and decreased in the other layers. root dm input was 1.94-2.01 mg ha-1 in soybean and 2.50-3.79 mg ha-1 in corn. for soybean, c and n root inputs were 0.61-0.63 mg ha-1 and 36.9-38.2 kg ha-1, respectively. for corn, c and n root inputs were 0.72-1.10 mg ha-1 and 18.78-28.48 kg ha-1, respectively. independently of the tillage system, 80% of the roots were concentrated in the upper surface layer 0.43 to 0.54 m deep for soybean and in the upper surface layer 0.40 to 0.46 m deep for corn.
Varia??es qualitativas e quantitativas na microbiota do solo e na fixa??o biológica do nitrogênio sob diferentes manejos com soja
Pereira, Alan Alves;Hungria, Mariangela;Franchini, Julio Cezar;Kaschuk, Glaciela;Chueire, Lígia Maria de Oliveira;Campo, Rubens José;Torres, Eleno;
Revista Brasileira de Ciência do Solo , 2007, DOI: 10.1590/S0100-06832007000600017
Abstract: in this study, quantitative and qualitative microbiological parameters were evaluated to detect differences related to soil and crop management. the study was carried out in a field experiment installed 14 years ago on a rhodic eutrudox, in londrina, pr, brazil. treatments were a combination of a crop sequence (s) (soybean/wheat) and a crop rotation (r) (lupin/maize/black oat/soybean/wheat/soybean/wheat/soybean), either under conventional tillage (ct) or no-tillage (nt). evaluations were performed when all systems were under the soybean cropping season, at full flowering. amounts of microbial biomass carbon and nitrogen (mb-c and mb-n, respectively) were 114 and 157 % higher in nt than in ct. furthermore, the metabolic quotient (qco2) was lower under nt, indicating higher metabolic efficiency of the soil microbes. these parameters were not affected by the crop sequence/rotation. genetic diversity of the total soil bacterial community was higher under nt and lower in the ct system with crop sequence. regarding the biological n2 fixation, it was found that plant biomass, total n and fraction of n-ureides in shoots, as well as nodule efficiency, were higher under nt. genetic diversity of rhizobia was affected mainly by crop management and was higher under crop rotation, probably due to the greater number of plant species. however, crop rotation decreased the efficiency of the biological n2 fixation process, which may be related to more abundant n in the soil or to a lower selection pressure for efficient rhizobia. for soil microbes with specific functions, e.g., rhizobia, genetic diversity may therefore differ from functionality.
Determina??o condutométria de carbonato residual do calcário aplicado no solo por análise em fluxo
Kawazaki, Lilka Isuzu;Miyazawa, Mario;Pavan, Marcos Antonio;Franchini, Julio Cezar;
Química Nova , 2000, DOI: 10.1590/S0100-40422000000400021
Abstract: the objective of this study was to evaluate a flow injection system for determination of residual co32- in soil amended with lime material. it was used a closed system were the co2 released from soil sample acidified with 0.5 mol l-1 hcl was capted in a 0.2 mol l-1 naoh solution. after 16h the capted co2 was determined by conductivimetry using a flow injection system. the results obtained by the proposed method were significantly correlated with those reported in soil samples used by the international soil analytical exchange programe. the regression equation was: y = 0.987x ? 0.075 r = 0.996, p > 0.01. for acid soils amended with caco3 the method showed a deviation error of 2.7%, detection limit was 0.077 mmol kg-1 of co32-, and a recovery of 99.7% of the total co32- added in soil sample. the method was easily adapted for routine determination of residual co32- in soil samples with an analytical frequency of 40 samples per hour.
Compara??o entre os métodos de fumiga??o-extra??o e fumiga??o-incuba??o para determina??o do carbono da biomassa microbiana em um Latossolo
Brand?o-Junior, Osvaldino;Hungria, Mariangela;Franchini, Julio Cezar;Espindola, Carlos Roberto;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000500012
Abstract: more and more studies, including in brazil, have suggested the use of microbial biomass carbon (mbc) as a bioindicator of soil quality. most studies employ two methods: the pioneer of fumigation-incubation (fi), in which the mbc is estimated based on co2 emission from fumigated and non-fumigated soil samples after 10 days of incubation and fumigation-extraction (fe), in which mbc is estimated based on c extraction from fumigated and non-fumigated soil samples after 12 h. however, in brazil the correlation between both methods has been evaluated in three ecosystems only: in the amazon, the cerrado and three soils of the state of rio de janeiro. in this paper the methods fe and fi were compared in a typical dark red oxisol in the north of paraná state. the analyses were performed in a 12 year-field trial in londrina with six treatments, including three soil managements (no-tillage, nt; conventional tillage with traditional ploughing and disking, ct; and nt using a field cultivator every three years, fc) and two crop management types (crop rotation, cr; or multiple cropping, mc) systems. four soil samples (0-10 cm) were taken: after winter harvest (wheat in cr and lupin in mc), after summer ploughing (for ct and fc treatments), after summer sowing (soybean in cr and maize in mc) and in the summer crop flowering stage. in general the variability was low by both methods and the coefficient of variation was higher, the lower the mbc values. no differences between the fe and fi methods were detected when the four samplings at different stages as well as when all treatments were considered together. when all treatments were analyzed together, the correlation between fe and fi was positive and statistically significant. however, when each treatment was considered separately significance was observed for the treatments nt and ct in cr and mc, but not for fc. results indicate that both methods may be used to evaluate mbc under similar conditions in northern paraná, however, th
Determina o condutométria de carbonato residual do calcário aplicado no solo por análise em fluxo
Kawazaki Lilka Isuzu,Miyazawa Mario,Pavan Marcos Antonio,Franchini Julio Cezar
Química Nova , 2000,
Abstract: The objective of this study was to evaluate a flow injection system for determination of residual CO3(2-) in soil amended with lime material. It was used a closed system were the CO2 released from soil sample acidified with 0.5 mol L-1 HCl was capted in a 0.2 mol L-1 NaOH solution. After 16h the capted CO2 was determined by conductivimetry using a flow injection system. The results obtained by the proposed method were significantly correlated with those reported in soil samples used by the International Soil Analytical Exchange Programe. The regression equation was: y = 0.987x -- 0.075 r = 0.996, P > 0.01. For acid soils amended with CaCO3 the method showed a deviation error of 2.7%, detection limit was 0.077 mmol kg-1 of CO3(2-), and a recovery of 99.7% of the total CO3(2-) added in soil sample. The method was easily adapted for routine determination of residual CO3(2-) in soil samples with an analytical frequency of 40 samples per hour.
Conjunto mínimo de parametros para avalia??o da microbiota do solo e da fixa??o biológica do nitrogênio pela soja
Souza, Rosinei Aparecida de;Hungria, Mariangela;Franchini, Julio Cezar;Maciel, Carlos Dias;Campo, Rubens José;Zaia, Dimas Augusto Morozin;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008000100011
Abstract: the objective of this work was to evaluate and validate a minimum set of parameters capable of monitoring, under field conditions, soil microbes and/or the biological n2 fixation process with the soybean crop. the field trials were performed in commercial fields (2002/2003) and experimental areas (2004/2004), with complete randomized blocks design. microbial biomass c (mbc) and n (mbn) were adequate for the quantitative evaluation of soil microbes; the parameters were significantly correlated therefore the determination of only one of them is sufficient. positive and significant correlations were also obtained between the parameters of shoot dry weight (sdw) and mbc and mbn. the analysis of total soil dna by the denaturating gradient gel electrophoresis method (dgge) detected qualitative changes in soil microbes, related to the homogeneity of the area, as well as to differences among treatments, areas and harvests. nodule dry weight (ndw) was the most suitable parameter for the evaluation of nodulation. significant correlations were obtained between the sdw and the total n accumulated in shoots (tns). similar results were obtained between sdw and total n-ureides (tnu). monitoring of the symbiosis in soils traditionally cropped with soybean and poor on n may be achieved only by the determination of ndw and sdw.
Avalia??o qualitativa e quantitativa da microbiota do solo e da fixa??o biológica do nitrogênio pela soja
Souza, Rosinei Aparecida de;Hungria, Mariangela;Franchini, Julio Cezar;Chueire, Ligia Maria de Oliveira;Barcellos, Fernando Gomes;Campo, Rubens José;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008000100010
Abstract: the objective oh this work was to define, for edaphoclimatic conditions of brazil, acceptable levels of dispersion of some biological parameters, used in studies of environmental impact due to the adoption of new technologies with the soybean crop. two experiments were performed in eleven counties, in six states and in the federal district, with conventional and transgenic soybean. evaluated parameters were: carbon and nitrogen of the microbial biomass, microbial respiration, microbial metabolic quotient, electrophoresis of soil dna in denaturating gradient gel (dgge), biological nitrogen fixation, number of rhizobial cells, nodule number and nodule dry weight, nodule occupancy by bradyrhizobium strains, shoot dry weight, total nitrogen in shoot and nitrogen as ureides in shoot. the temporal variability for carbon and nitrogen of microbial biomass, microbial respiration and microbial metabolic quotient was adequate, and the maximum coefficient of variation was estimated at 35%. the homogeneity between replicates, treatments and harvests was confirmed by the dgge method. in n-poor soils, the parameters of nodules and shoot dry weight, with maximum coefficient of variation 33 and 18%, respectively, were adequate for evaluation of biological nitrogen fixation, which contributed from 72 to 88% of total nitrogen in shoot.
Compacta??o em um latossolo vermelho distroférrico e suas rela??es com o crescimento radicular do milho
Bergamin, Anderson Cristian;Vitorino, Antonio Carlos Tadeu;Franchini, Julio Cezar;Souza, Cristiano Márcio Alves de;Souza, Fábio Régis de;
Revista Brasileira de Ciência do Solo , 2010, DOI: 10.1590/S0100-06832010000300009
Abstract: compaction of agricultural soils due to intensive farming with intense traffic of agricultural machinery has become a limiting factor for crop development in recent years. the objective of this study was to evaluate a rhodic acrustox under no-tillage for the influence of compaction on the soil density, porosity, penetration resistance and aggregate stability, and the consequences on corn root growth. compaction was induced by tractor traffic of mf 292 (105 hp), with a mass of 5 mg and pressure inflation of 96 kpa for front tires (14.9-24 r1) and 110 kpa for rear tires (18.4 - 34 r1) in the following treatments: nt - current condition that reflects the history of eight years of no-tillage, no-tillage with additional compaction by tractor traffic in one (nt - 1), two (nt - 2), four (nt - 4) and six passes (nt - 6). soil microporosity was not affected by additional compaction. the root diameter, length and surface values were reduced, with a decrease of 85 % in root length of nt compared to nt - 6. increased soil compaction induced by tractor traffic with two passes (220 kpa) or more increased soil density and reduced macroporosity and total porosity, while four passes (440 kpa) or more resulted in an increase in soil penetration resistance to a depth of 0.10 m. macroporosity is a good indicator of soil quality in assessments of root length and surface.
Demência reversível e quedas associadas ao biperideno
Rigo, Julio César;Rigo, Juliana Ferrari de Oliveira;Faria, Breno Cezar;Santos, Vitorino Modesto dos;
Revista de Psiquiatria Clínica , 2006, DOI: 10.1590/S0101-60832006000100004
Abstract: anticholinergic drugs may cause adverse effects, more often in the aged patients. we describe a case of reversible dementia and falls, associated with the use of biperiden. the patient was an 82-year old woman, admitted in a geriatric home because of frequent falls at home, progressive cognitive deficit and tremor of extremities with movement, in addition to remarkable loss of autonomy. as a matter of fact, she presented an essential tremor, which was mistakenly diagnosed as parkinson disease and treated with biperiden; furthermore, she developed a drug-induced cognitive deficit, erroneously interpreted as alzheimer disease. after submitted to the specialized evaluation, the anticholinergic drug was discontinued and there was a complete improvement of cognition changes; the essential tremor is under control with use of propranolol. when evaluating a patient with cognitive deficit, the clinician must discard possible causes of reversible dementia, especially the iatrogenic group.
O uso de Análise Contextual de Tarefas para a gest o da propriedade intelectual El uso de Análisis Contextual de Tarea para la gestión de la propiedad intelectual
Eliandro dos Santos Costa,Andre Zanki Cordenonsi,Julio Cezar Mairesse Siluk,Felipe Martins Müller
Informa??o & Informa??o , 2011, DOI: 10.5433/1981-8920.2010v15n2p129-147
Abstract: Apresenta o processo de desenvolvimento de um modelo para sistema de gest o de propriedade intelectual por meio do uso de metodologia de análise contextual de tarefas, a qual visa desenvolver a modelagem sob a vis o do usuário. Apresenta um estudo de caso, onde é empregada a abordagem sugestionada para o levantamento de requisitos. Tem como objetivo desenvolver um modelo que apresente melhorias na gest o de processos de prote o de propriedade intelectual, e que forne a dados que explicitem a importancia do uso de ferramentas gerenciais como forma de melhoria no desempenho da prote o da produ o intelectual da organiza o. Os resultados obtidos por meio do desenvolvimento de fluxos e com a estrutura o das atividades foram positivos, melhorando a eficiência da recupera o de dados e conseqüentemente o aumento da capacidade de inovar da organiza o.
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