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Desempenho dos Sistemas de Irriga o na Cultura da Banana no Perímetro Irrigado Baixo Acaraú, Ceará
Rafaela Ferreira Caitano,Fernando Bezerra Lopes,Francisco de Souza,Marcos Amauri Bezerra Mendona
Revista Brasileira de Agricultura Irrigada , 2011, DOI: 10.7127/rbai.v5n200051
Abstract: Objetivou-se com este trabalho avaliar o desempenho dos sistemas de irriga o na cultura da banana do Perímetro Irrigado Baixo Acaraú, Ceará. As avalia es foram realizadas em oito lotes, em julho de 2007. As vaz es foram coletadas em quatro pontos ao longo da linha lateral, ou seja, do primeiro emissor, dos emissores situados a 1/3 e 2/3 do comprimento e do último emissor. As linhas laterais foram avaliadas da mesma forma ao longo da linha de deriva o. Com esses valores foram determinados os seguintes coeficientes: Uniformidade de Christiansen - CUC, Uniformidade de Distribui o – CUD, Eficiência de Aplica o e as varia es de press o e vaz o ao longo das linhas laterais. Apenas o lote C, apresentou em todas as linhas avaliadas, uma varia o na vaz o inferior ao limite máximo recomendado. Para a varia o de press o ao longo das linhas laterais, os lotes A, C, F e H ficaram abaixo do limite máximo recomendado. O CUC variou de 49 a 98% para os lotes B e C, respectivamente. Foram considerados como excelentes 50% dos lotes avaliados enquanto50% apresentaram funcionamento inadequado em rela o ao CUC. Em rela o ao CUD, 37,5% foram classificados como ruins; e 12,5% apresentaram-se regulares. Uma eficiência de aplica o inaceitável foi constatada em 62,5% dos lotes. Os sistemas de irriga o funcionavam com baixo desempenho da uniformidade de distribui o (50%) e baixa eficiência de aplica o da água (62,5%). Os produtores têm necessidade de palestras, de cursos práticos e da a o da extens o rural, de modo que possam aprender as técnicasadequadas do manejo da irriga o.
Investigation of the maximum and minimum temperatures in the semi-arid region of northeastern Brazil. = Investiga o das temperaturas máximas e mínimas no semiárido cearense, nordeste do Brasil.
Eunice Maia Andrade,Meilla Marielle Araújo Rodrigues,Marcos Amauri Bezerra Mendona,Luiz Carlos Guerreiro Chaves
Agro@mbiente On-line , 2011,
Abstract: Temperature records all over the world provide evidence that the earth’s climate is changing. To investigate changes in the extreme temperatures of semi-arid regions, we analyzed 33 years (1975-2008) of monthly maximum and minimum air temperatures for three weather stations located in Quixeramobim, Crateús and Barbalha Cities, Ceará, Brazil. The data sets were provided by INMET (Instituto Nacional de Meteorologia), Brazil. Dataset of each station was shared in decades to better understand the temperature tendency as well as to identify the warmest one. The two most recent decades were the warmest at all three stations investigated, and the highest temperature values were observed for Barbalha station. The highest increases of maximum temperature occurred during the dry season (May/Dec), and the warmest month was October, during which temperature increases of up to 1.63 °C were observed in the 1980s. The minimum temperature increased substantially during the rainy season (Jan/Apr) and during the coldest months (Jun/Jul). The highest increase of minimum temperature (3.08°C) was observed in July at the Barbalha station. The Quixeramobim station showed no significant increases in minimum temperature. The results indicate that temperature increases occur in an irregular pattern, suggesting that various regional agents affect changes in temperature.
Extreme temperature trends in the equatorial region of Brazil: Case study of the state of Ceará
Andrade, Eunice Maia de;Silva, Bernardo Barbosa da;Rodrigues, Meilla Marielle Araújo;Mendona, Marcos Amauri Bezerra;Chaves, Luiz Carlos Guerreiro;
Revista Ciência Agron?mica , 2012, DOI: 10.1590/S1806-66902012000200008
Abstract: despite uncertainties as to the real causes, there is a large amount of evidence of climatic change on earth. with the objective of investigating changes in extreme air temperatures, as well as the local effects of these changes, eight data sets, collected throughout the state of ceará in brazil, were analyzed. four series of data were obtained from the semi-arid region, three from the coastal zone, and one from a mountainous region. to quantify the changes that occurred during the study period, variations in maximum and minimum temperatures were calculated in relation to the mean of each data series. the annual rates of temperature increase were estimated from the angular coefficients of the best-fit lines. the results showed that although there are differences in trends between stations, there was a systematic increase in the maximum and minimum temperature in the nineties, which was especially evident in the following decade. the highest rates of increase were recorded for the minimum temperatures (from 9.0 to 8.3 °c per century) for the stations at guaramiranga and crateús respectively. these data provide evidence for a greater retention of energy in the form of sensible heat during the night, possibly due to a more difficult energy exchange between the surface and the atmosphere.
Mapeamento de QTLs associados à produ??o de frutos e sementes em híbridos de Citrus Sunki vs. Poncirus trifoliata
Siviero, Amauri;Cristofani, Mariangela;Boava, Leonardo P.;Machado, Marcos A.;
Revista Brasileira de Fruticultura , 2002, DOI: 10.1590/S0100-29452002000300045
Abstract: citrus group shows juvenility strong due incapacity to flowering, vigor and thorn formation. trifoliata hybrids used as rootstocks to induce early production and better field for 'valencia' orange scion. seeds number per fruit is very important characteristic to citrus rootstocks candidate. the present study has as objective to detect quantitative trait loci (qtl) associated to fruiting and seeds production in f1 progeny obtained of citrus sunki vs. poncirus trifoliata cross. linkage groups (lg) of parents were built by pseudotestcross strategy using rapd markers. fruits/plant and seeds/fruit numbers were counting using 80 individuals of progeny. qtl detection was made with composite interval mapping using the qtl cartographer. qtl linked to fruiting and seed production in lg 4 and lg 5 of the p. trifoliata map, respectively, were detected.
Mapeamento de QTLs associados à produ o de frutos e sementes em híbridos de Citrus Sunki vs. Poncirus trifoliata
Siviero Amauri,Cristofani Mariangela,Boava Leonardo P.,Machado Marcos A.
Revista Brasileira de Fruticultura , 2002,
Abstract: O grupo dos citros apresenta acentuada juvenilidade manifestada pela incapacidade de florescimento, vigor e forma o de espinhos. No caso da laranja 'valência', os híbridos de trifoliata, utilizados como porta-enxertos, induzem maior precocidade e produtividade. O número de sementes do fruto (NSF) constitui importante característica da variedade candidata a porta-enxerto de citros. O presente estudo teve como objetivo detectar QTLs associados às características número de frutos por planta (NF) e número de sementes por fruto em uma progênie F1 derivada de um cruzamento entre Citrus sunki e Poncirus trifoliata 'Rubidoux'. Os grupos de liga o (GL) dos parentais foram obtidos usando a estratégia 'pseudotestcross' e marcadores do tipo RAPD. A contagem do número de frutos por planta e o número médio de sementes por fruto foi realizada usando 80 indivíduos da progênie. A detec o dos QTLs foi realizada pelo método de mapeamento por intervalo composto utilizando o programa QTLCartographer. Foram detectados um QTL associado à frutifica o e um QTL ligado ao número de sementes situados no GL 4 e GL 5 no mapa de P. trifoliata, respectivamente.
Comportamento do íon magnésio em prova triathlon meio-ironman
Bürger-Mendona,Marcos;
Motricidade , 2008,
Abstract: the present study it had as objective to analyze the response of the ion magnesium before and after-competition of triathlon in athlete of the masculine sex, in the half-ironman distance, through it biochemistry analyzes of the concentration of the ion magnesium in the plasma blood. ten physically active volunteers of the masculine sex participated in the present study, divided in two groups: control and experimental. the integrants of the experimental group was submitted to two blood collections (approximately 25 ml), after eight hours dietary restriction in the seated position. the second blood sample was collected immediately at ending of the competition of each athlete (t=1). for statistical analysis was used the software spss 11.0, and t-student test for statistical comparisons between the two groups (p<0.05 accepted as significant). when compared the values before the competition between the control group and experimental group a significant difference in the concentration of plasma magnesium (p=0,005) was observed. when compared the values of plasma magnesium concentration in the experimental group before and after competition a significant difference (p=0,005), with an average reduction of 35,23% was observed. in the comparison of values after-competition between the experimental group and control, a significant difference in the plasma magnesium concentration was detected, indicating that the exercises of long duration cause a depletion of magnesium reserves of the organism.
Brazilian Guidelines for transcranial doppler in children and adolescents with sickle cell disease
Lobo, Clarisse Lopes de Castro;Can?ado, Rodolfo Delfini;Leite, Ana Claudia Celestino Bezerra;Anjos, Ana Claudia Mendona dos;Pinto, Ana Cristina Silva;Matta, Andre Palma da Cunha;Silva, Célia Maria;Silva, Gisele Sampaio;Friedrisch, Jo?o Ricardo;Braga, Josefina Aparecida Pellegrini;Lange, Marcos Christiano;Figueiredo, Maria Stella;Rugani, Marília álvares;Veloso, Orlando;Moura, Patrícia Gomes;Cortez, Paulo Ivo;Adams, Robert;Gualandro, Sandra Fátima Menosi;Castilho, Shirley Lopes de;Thomé, Ursula;Zetola, Viviane Flumignan;
Revista Brasileira de Hematologia e Hemoterapia , 2011, DOI: 10.5581/1516-8484.20110014
Abstract: background: sickle cell disease is the most common monogenic hereditary disease in brazil. although strokes are one of the main causes of morbidity and mortality in these patients, the use of transcranial doppler to identify children at risk is not universally used. objective: to develop brazilian guidelines for the use of transcranial doppler in sickle cell disease children and adolescents, so that related health policies can be expanded, and thus contribute to reduce morbidity and mortality. methods: the guidelines were formulated in a consensus meeting of experts in transcranial doppler and sickle cell disease. the issues discussed were previously formulated and scientific articles in databases (medline, scielo and cochrane) were carefully analyzed. the consensus for each question was obtained by a vote of experts on the specific theme. results: recommendations were made, including indications for the use of transcranial doppler according to the sickle cell disease genotype and patients age; the necessary conditions to perform the exam and its periodicity depending on exam results; the criteria for the indication of blood transfusions and iron chelation therapy; the indication of hydroxyurea; and the therapeutic approach in cases of conditional transcranial doppler. conclusion: the brazilian guidelines on the use of transcranial doppler in sickle cell disease patients may reduce the risk of strokes, and thus reduce the morbidity and mortality and improve the quality of life of sickle cell disease patients.
Periodic Modulation of Nonlinearity in a Fiber Bragg Grating: A Numerical Investigation  [PDF]
Antonio Francisco Gomes Furtado Filho, José Rubens Rodrigues de Sousa, Apiano Ferreira de Morais Neto, Jose Wally Mendona Menezes, Antonio Sergio Bezerra Sombra
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2012, DOI: 10.4236/jemaa.2012.42007
Abstract: We present numerical studies on the switching characteristics of a fiber Bragg grating (FBG) with modulation in the third order nonlinear index of refraction along it’s length. The FBG is operating in a continuous wave regime (CW). This study was done taking into account the possible asymmetry brought by the non harmonic modulation of the nonlinearity, leading to different reflection and transmission characteristics, that depend on the direction of propagation along the modulated nonlinear FBG. This phenomenon may be useful for applications like an optical isolator. It was found that for a set of values of the modulation parameter, the FBG can exhibit multistable states. The numerical studies were obtained starting from the coupled-mode equations solved from the coupled-mode theory and simulated using the fourth-order Runge-Kutta method.
Optical Bistability in an Acousto-Optic Tunable Filter (AOTF) Operating with Short Optical Pulses  [PDF]
Karlo David Alves Sabóia, Alex Sander Barros Queiroz, Francisco Tiago Lima, Cícero Saraiva Sobrinho, Jose Wally Mendona Menezes, Antonio Sergio Bezerra Sombra
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2012, DOI: 10.4236/jemaa.2012.43015
Abstract: In this paper we report for the first time the presence of bistability in an acoustic-optic tunable filter (AOTF) operating with ultrashort (2 ps) optical light pulses. The results for the study of bistability has shown the dependence of the hysteresis curve with the product of the coupling constant (κ) by the length of the device (ξL) and the conversion power-coupling constant factor (G). The range of bistability varies significantly with both G and with κξL parameters. The variation of κξL directly increases the size of the range of bistability hysteresis while the increase in G causes the bistability to occur at low powers. The phenomenon of optical bistability (OB) is the object of increasing interest due to its possibilities for important device applications. A bistable device is a device with a capability to generate two different outputs for a given input and the physical requirements for this are an intensity-dependence refractive index and an optical feedback mechanism.
Avalia??o in vitro de genótipos de citros a Phytophthora parasitica
Siviero, Amauri;Santos, Francineide A.;Cristofani, Mariangela;Furtado, Edson L.;Machado, Marcos A.;
Fitopatologia Brasileira , 2004, DOI: 10.1590/S0100-41582004000300010
Abstract: the objective of this work was to evaluate the effect on citrus (citrus spp.) rootstocks to phytophthora parasitica by in vitro inoculation. seedlings were cultivated in ms media for 40 days, under 18 h of light of photoperiod and at 25 oc. inoculation was performed by injecting an infested needle into seedling collars. evaluation was made by the length of lesions in centimeters. the experimental design was random with 15 replicates of each genotype. results indicate good correlation between in vitro and orchard reactions genotypes to p. parasitica.
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