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Search Results: 1 - 10 of 201302 matches for " Walter E;Santos "
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Rapid Differentiation of Closely Related Citrus Genotypes by Fluorescence Spectroscopy  [PDF]
Dayse Drielly Souza Santana-Vieira, Débora Marcondes Bastos Pereira Milori, Paulino Ribeiro Villas Boas, Marina Fran?a e Silva, Magno Guimar?es Santos, Fernanda Amato Gaiotto, Walter dos Santos Soares Filho, Abelmon da Silva Gesteira
Advances in Bioscience and Biotechnology (ABB) , 2014, DOI: 10.4236/abb.2014.511105
Abstract: The differentiation of closely related Citrus genotypes is a meticulous, laborious, and time-consuming task that involves the assessment of complex traits such as growth, tolerance to stress, photosynthetic efficiency, yield, and many others. Such a task is generally accomplished either by analyzing specific features of adult plants or by applying molecular markers to young trees. On one hand, only after plants start yielding can distinct genotypes be differentiated by comparing their fruit sizes, shapes, taste, and the number of seeds. On the other hand, molecular markers are expensive, and demand expertise and time for the analysis of a larger number of plants. For these reasons, the development of techniques that could assist in an early, quick and accurate differen-tiation of closely related Citrus varieties is of utmost importance. In this context, laser-induced fluorescence spectroscopy (LIFS) is a promising technique, since it is rapid, highly sensitive, and inexpensive. Previous studies showed that LIFS can differentiate a variety of sweet orange. However, this new study aimed to determine LIFS accuracy in the differentiation and grouping of very closely varieties of four Sunki mandarin selections: Comum, Florida, Tropical, and Maravilha. Furthermore we compared the results with ISSR and SSR molecular markers for the same varieties. LIFS technique distinguished the four selections with accuracy greater than 70%. Only with molecular markers was possible distinguishing clearly Tropical from Maravilha, but not Comum from Florida selections. In this way the results suggest that LIFS may be a sound tool for helping the identification of closely Citrus varieties.
Cu e Zn na cultura do sorgo cultivado em três classes de solos: II. Composi??o mineral
Santos, Hemmannuella C.;Fraga, Vania S.;Raposo, Roberto W. C.;Pereira, Walter E.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2009, DOI: 10.1590/S1415-43662009000200004
Abstract: the micronutrients copper and zinc have important functions in vegeatable metabolism, but studies about micronutrient needs for sorghum are scarce. aiming to evaluate the effect of copper and zinc application in nutritional attributes of sorghum an experiment was carried out in a randomized block experimental design with a combination of five doses of copper (0, 0.26, 0.90, 1.54 and 1.80 mg kg-1) and five doses of zinc (0, 0.32, 1.1, 1.88 and 2.2 mg kg-1) combined by box central composite design, resulting in nine treatments, which were applied in three soil classes (latosol, alfisol and entisol), with three replications. ninety six days after sowing, nutrients contents and accumulation and protein contents were determined. the copper application increased nitrogen, phosphorus, potassium and copper contents and crude protein content in grains, however, the same results were not observed for zinc application. alfisol was the soil most responsive to the application of nutrients.
Cu e Zn na cultura do sorgo cultivado em três classes de solos: I. Crescimento vegetativo e produ??o
Santos, Hemmannuella C.;Fraga, Vania S.;Raposo, Roberto W. C.;Pereira, Walter E.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2009, DOI: 10.1590/S1415-43662009000200003
Abstract: the micronutrients copper and zinc are important for good vegetative growth and for grain formation in cereals. an experiment was carried out aiming to evaluate the effect of copper and zinc application upon growth attributes of sorghum and upon its grain yield. a randomized block experimental design was used, with a combination of five doses of copper (0, 0.26, 0.90, 1.54 and 1.80 mg kg-1) and five doses of zinc (0, 0.32, 1.1, 1.88 and 2.2 mg kg-1) combined by box central composite design, resulting in nine treatments which were applied in three soil classes (latosol, alfisol and entisol), with three replications. ninety six days after sowing, growth attributes and sorghum yield were determined. the copper application increased leaf area, stem diameter, panicle length and diameter, dry matter yield and grain yield, however the same results were not observed for zinc application. the foliar concentrations of copper and zinc presented negative interactions between the applied doses. alfisol was the soil most influenced by nutrient application.
Potencial genético de um sintético de milho de gr os duros para forma o de híbridos
Gama Elto Eugenio Gomes e,Santos Manoel Xavier dos,Ferr?o Romário Gava,Meireles Walter F.
Ciência Rural , 2003,
Abstract: O objetivo deste estudo foi determinar através das estimativas de parametros genéticos o potencial de um sintético de milho de gr os duros e de ciclo semiprecoce, para a forma o de híbridos e/ou melhoramento intrapopulacional. Foram utilizadas 142 progênies endogamicas S2 do Sin EEL Flint, em cruzamentos topcrosses com um Sintético heteroticamente contrastante. Essas progênies topcrosses foram avaliadas utilizando-se o delineamento em látice simples 12 x 12, e em dois locais de teste. Os maiores valores médios para PED foram observados para os topcrosses n.masculine 101 (12069kg ha-1) e no 72 (11068Kg ha-1), tendo o primeiro apresentado comportamento específico para Londrina, e o segunda demonstrado comportamento superior nos dois ambientes. Os valores das estimativas dos parametros estudados foram semelhantes aos encontrados em alguns estudos conduzidos em condi es tropicais. O grupo de progênies S2 da Sin EEL Flint conduziu a valores médios de , CVg e h2 similares aos encontrados na literatura para outros genótipos. Observa-se que esse Sintético possui suficiente variabilidade genética e potencial para extra o de linhagens para forma o de híbridos e como germoplasma em programas de melhoramento.
Yield of sweet potato fertilized with cattle manure and biofertilizer
Oliveira, Ademar P;Santos, Jo?o F;Cavalcante, Lourival F;Pereira, Walter E;Santos, Maria do Carmo CA;Oliveira, Arnaldo Nonato P;Silva, Natália V;
Horticultura Brasileira , 2010, DOI: 10.1590/S0102-05362010000300006
Abstract: in northeastern brazil, the sweet potato is cultivated in small farms, in a family farming systems, constituting themselves an alternative way for the generation of food, employment and income. this study aimed to assess the effect of cattle manure levels and biofertilizer concentrations on the sweet potato cultivar white queen productivity. the experiment was carried out from march to september 2007 at the emepa experimental station in lagoa seca, brazil. the experimental design was randomized blocks, in split split plot 6 x 4 x 2 + 1 scheme, with four replications. the plots consisted of cattle manure levels (0, 10, 20, 30, 40 and 50 t ha-1), the subplot of biofertilizer concentrations (0, 15, 30 and 45%) and the sub subplots consisted of methods of biofertilizer application, to the soil or leaves. also, there was an additional control treatment using n, p and k mineral fertilizer. commercial and total root productivity was evaluated. the levels of 30.8 and 31.2 t ha-1 of cattle manure were responsible for the highest commercial and total sweet potato root productivity (17.4 and 13.1 t ha-1, respectively). biofertilizer concentrations of 29 and 28%, applied to soil and to leaves provided, respectively, the greatest productivities of total roots (15.4 and 13.1 t ha-1), whereas concentrations of 30 and 27%, also applied to soil and leaves were responsible, respectively, for the highest commercial root productivity (11 and 9.7 t ha-1).
Chromosome number and secondary constriction variation in 51 accessions of a citrus germplasm bank
Guerra, Marcelo;Pedrosa, Andrea;Silva, Ana Emília Barros e;Cornélio, Maria Tereza Marquim;Santos, Karla;Soares Filho, Walter dos Santos;
Brazilian Journal of Genetics , 1997, DOI: 10.1590/S0100-84551997000300021
Abstract: the mitotic chromosomes of 51 citrus accessions from the centro nacional de pesquisa em mandioca e fruticultura tropical, cruz das almas, ba, brazil, were analyzed. the sample included representatives of 20 citrus species, one of poncirus and seven hybrids. all accessions showed 2n = 18 without any evidence of numerical variation. the most clearly variable karyotype feature was the number and position of secondary constrictions (secs). in 19 accessions the secs were not identified, mainly due to the degree of chromatin condensation. in the remainder they varied in number from one to three per karyotype. they were found in the proximal region of one of the three largest chromosome pairs, in the terminal/subterminal region of a smaller chromosome or, more seldom, terminally in a larger chromosome. only in a few cases were such constrictions observed simultaneously in both homologues of the same chromosome pair. the high variability of this karyotype feature may be due to the activation of this region in the previous interphase but may also indicate a high structural variability and heterozygosity of citrus germplasms
Mirtazapin – eine kosteneffektive Behandlung der Depression: eine sterreichische Analyse
Walter E
Journal für Neurologie, Neurochirurgie und Psychiatrie , 2003,
Gerhard Hochschild (1915/2010) A Mathematician of the XXth Century
Walter Ferrer Santos
Mathematics , 2011,
Abstract: Gerhard Hochschild's contribution to the development of mathematics in the XX century is succinctly surveyed. We start with a personal and mathematical biography, and then consider with certain detail his contributions to algebraic groups and Hopf algebras.
The Heisenberg product: from Hopf algebras and species to symmetric functions
Marcelo Aguiar,Walter Ferrer Santos,Walter Moreira
Mathematics , 2015,
Abstract: Many related products and coproducts (e.g. Hadamard, Cauchy, Kronecker, induction, internal, external, Solomon, composition, Malvenuto-Reutenauer, convolution, etc.) have been defined in the following objects : species, representations of the symmetric groups, symmetric functions, endomorphisms of graded connected Hopf algebras, permutations, non-commutative symmetric functions, quasi-symmetric functions, etc. With the purpose of simplifying and unifying this diversity we introduce yet, another -non graded- product the Heisenberg product, that for the highest and lowest degrees produces the classical external and internal products (and their namesakes in different contexts). In order to define it, we start from the two opposite more general extremes: species in the "commutative context", and endomorphisms of Hopf algebras in the "non-commutative" environment. Both specialize to the space of commutative symmetric functions where the definitions coincide. We also deal with the different coproducts that these objects carry -to which we add the Heisenberg coproduct for quasi-symmetric functions-, and study their Hopf algebra compatibility particularly for symmetric and non commutative symmetric functions. We obtain combinatorial formulas for the structure constants of the new product that extend, generalize and unify results due to Garsia, Remmel, Reutenauer and Solomon. In the space of quasi- symmetric functions, we describe explicitly the new operations in terms of alphabets.
Fetal Hemodynamic Response to Maternal Isometric Exercise  [PDF]
Karina Biaggio Soares, Francisco Maximiliano Pancich Gallarreta, Walter Santos Neme
Open Journal of Obstetrics and Gynecology (OJOG) , 2018, DOI: 10.4236/ojog.2018.86061
Abstract: Background: Studies on physical activity during pregnancy and its impact on mother and fetus are still limited. International protocols consider only aerobic exercise and fail to provide information about other modalities such as isometric exercise. Isometric exercise promotes cardiorespiratory resistance and muscle strengthening, but it is rarely tested on pregnant women because it increases maternal blood pressure and can subsequently affect placental circulation. Objective: To evaluate maternal and fetal response of low-risk pregnant women undergoing isometric testing through a Doppler velocimetry study. Methodology: A cross-sectional, experimental study was performed on 46 healthy pregnant women (gestational age between 26 and 36 weeks) who underwent isometric testing. This testing was performed using a handgrip dynamometer to measure maternal and fetal hemodynamic parameters before, during, and after isometric testing. Results: There was a significant increase in systolic blood pressure (BP; pre-isometrics 113.13 ± 9.92 mmHg, during isometrics 117.13 ± 10.24 mmHg, and post-isometrics 112.43 ± 9.87 mmHg, p < 0.001) and heart rate (HR; pre-isometrics 87.52 ± 14.10 bpm, during isometrics 97.61 ± 14.83 bpm, and post-isometrics 85.13 ± 13.24 bpm, p < 0.001). There were significant decreases in the pulsatility index (PI; pre-isometrics 0.63 ± 0.15, during isometrics 0.56 ± 0.15, and post-isometrics 0.65 ± 0.17, p = 0.001), resistance index (RI; pre-isometrics 0.44 ± 0.08, during isometrics 0.40 ± 0.07, and post-isometrics 0.45 ± 0.08, p = 0.001), and systolic/diastolic (S/D) ratio (pre-isometrics 1.81 ±
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