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Search Results: 1 - 10 of 480073 matches for " Francisco;PE?A CABRIALES "
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Dinamic of Bacteria Desnitrificants and Nitrificants in the Rizospheric of Wheat with Slow Release of Fertilizer, Irrigated with Waste or Well Water  [PDF]
Sandra Grisell Mora-Ravelo, Francisco Gavi Reyes, Jesús Pérez Moreno, Juan José Pea Cabriales, Leonardo Tijerina Chávez, Ma. de Lourdes de la Isla de Bauer
Advances in Microbiology (AiM) , 2013, DOI: 10.4236/aim.2013.34048
Abstract:

The study of the paper about the rhizosphere in the transformation of nitrogen compounds can generate knowledge of the microbial and biochemical atmosphere of the rhizosphere of wheat, for the understanding of the dynamics of the N in agricultural zones, with the purpose of optimizing the fertilizer use and increasing the productivity of the cultures. Therefore, the objective of the present work was to know the effect the rhizosphere in the dynamics of the bacterial populations that take part in the cycle of the N in wheat nourished with slow release fertilizer and one commercial, irrigated with waste water or well. Analyses in the soil took place vertisol used in the experiment with the rhizospheric and non rhizospheric fraction. The slow release fertilizer used has a matrix enriched with N and P and is in the process of being patented (it explains in materials and methods). Each fertilizer was evaluated and the combination of the slow release fertilizer with organic fertilizer. The technique of the number most probable was used (MNP) to carry out the quantification of the nitrificants and denitrificants bacteria to the 55, 67 and 97 days after sowing (Dds). The results obtained for the MNP of denitrificants bacteria and Nitrosomonas indicate that the effect average of the types of water, soil and fertilizers, as well as their interaction to each other was not significant (p > 0.05). The effect of the fertilizing type and soil (rhizospheric and non rhizospheric) in the MNP of Nitrobacter was significant (p < 0.05). The tendencies show that the non rhizospheric soil is more favorable for the development of denitrificants bacteria and Nitrobacter, whereas the MNP of Nitrosomonas was greater in rhizospheric soil.

Desnitrificación de un fertilizante de lenta liberación y urea+fosfato monoamónico aplicados a trigo irrigado con agua residual o de pozo
Sandra Grisell Mora Ravelo,Francisco Gavi Reyes,Juan José Pea Cabriales,Jesús Peréz Moreno
Revista internacional de contaminación ambiental , 2007,
Abstract: El estudio de la emisión de óxido nitroso (N2O) producto de la combinación de tipos de fertilizante y agua en suelo rizosférico, y no rizosférico a lo largo del ciclo del cultivo, puede generar conocimiento que contribuya a incrementar la eficiencia de recuperación del N de los fertilizantes o abonos y a reducir las pérdidas de nitrógeno (N) por desnitrificación. El empleo eficiente de fertilizantes nitrogenados y de aguas residuales no tratadas de origen urbano por los cultivos es una necesidad agronómica, económica y ambiental. La desnitrificación es un factor importante que generalmente disminuye la eficiencia del N aplicado a los cultivos. El objetivo del presente trabajo fue evaluar la desnitrificación de un fertilizante de lenta liberación usando como referencia urea+fosfato monoamónico y fertilizante orgánico, en trigo irrigado con agua residual o de pozo. Se efectuaron análisis en el suelo vertisol empleado en el experimento con la fracción rizosférica y no rizosférica. El fertilizante de lenta liberación usado tiene una matriz enriquecida con N y fósforo (P) y se encuentra en proceso de ser patentado. Se evaluó cada fertilizante y la combinación del fertilizante de lenta liberación con fertilizante orgánico. Las muestras de suelo rizosférico y no rizosférico fueron colectadas a los 55, 67 y 97 días después de la siembra, se incubaron durante 18 días a una temperatura de 25 °C controlando diariamente la humedad. Los resultados (p < 0.05) arrojaron que las interacciones entre: muestreos y tipos de agua, muestreos y fertilizantes y tipos de agua y fertilizantes afectaron (p < 0.06) la emisión de N2O, la cual se incrementó al aplicar urea+fosfato monoamónico junto con agua residual. En promedio existió menos emisión de N2O al aplicar fertilizante de lenta liberación o fertilizante orgánico al irrigar con agua de pozo que con agua residual. El uso de agua residual en promedio se asoció con una mayor pérdida de N. La mayor emisión promedio de N2O ocurrió a los 67 días después de la siembra. La desnitrificación promedio fue similar en el suelo rizosférico y no rizosférico.
Desnitrificación de un fertilizante de lenta liberación y urea+fosfato monoamónico aplicados a trigo irrigado con agua residual o de pozo
MORA RAVELO, Sandra Grisell;GAVI REYES, Francisco;PEA CABRIALES, Juan José;PERéZ MORENO, Jesús;TIJERINA CHáVEZ, Leonardo;VAQUERA HUERTA, Humberto;
Revista internacional de contaminación ambiental , 2007,
Abstract: the study of n2o emission originated by the combination of different types of fertilizers and water on rizospheric soil, and non- rizospheric soil along the crop cycle, can contribute to useful knowledge in order to increase fertilizer and manure n recovery efficiency and to reduce the n loss by denitrification. the efficient use of nitrogen fertilizers and non- treated urban waste water for crops is an agronomic, economic and environmental need. the denitrification is an important factor that diminishes the n efficiency in crops. the objective of this investigation was to evaluate the denitrification of a slow release fertilizer using as reference urea plus monoamonium phosphate and an organic fertilizer, applied to wheat irrigated with urban waste water or well water. analyses were made in the vertisol type soil used in the experiment with both, rizospheric and non-rizospheric soil. the slow release fertilizer used has a matrix enriched with n and p and its patent is currently in progress. each fertilizer was evaluated alone, as well as the slow release fertilizer plus organic fertilizer. the samples of rhizospheric and non-rhizospheric soils for each treatment were collected at 55, 67 and 97 days after sowing and incubated during 18 days at 25 °c, controlling the soil humidity daily. the results (p < 0.05) showed that the interactions between samplings and types of water, samplings and fertilizers, and types of water and fertilizers affected (p < 0.06) the emission of n2o, which was increased when urea plus monoamonium phosphate and waste water were applied. on average, there was less n2o when emissions slow release fertilizer or organic fertilizer were applied and irrigated with well water as compared to irrigation with waste water. as well, use of waste water was, on average, associated with a bigger loss of n. the highest average emission in n2o was observed 67 days after sowing. the average denitrification was similar in the rhizospheric and non-rhizospheric
Republicanismo y Ecología Politica
Francisco Garrido Pea
Sequência : Estudos Juridicos e Politicos , 2012,
Abstract: In this work, is formulated a possible ideological hybridization between contemporary republicanism and political ecology. The proposal is an ecological republicanism or a republican ecologism, on condition that the republicanism is based in a weak anthropocentrism and the political ecology is also based in a weak biocentrism. According to this proposal, the political ecology expands the original orientation of republicanism (the equality), and the republicanism sutures one of the potential pathologies (authoritarian fisiocratism) of political ecology.Resumen: En este trabajo formulo una posible hibridación ideológica entre el republicanismo contemporáeo y la ecología política. La propuesta es un republicanismo ecológico o un ecologismo, republicano a condición de que el republicanismo se fundamente en un antropocentrismo débil y la ecología política se base también en un biocentrismo débil. Según esta propuesta, la ecología política amplia la orientación original del republicanismo (la via igualitaria) y el republicanismo sutura alguno de las patologías potenciales (fisiocratismo autoritario) de la ecología política.Abstract: In this work, is formulated a possible ideological hybridization between contemporary republicanism and political ecology.
El género fúngico Trichoderma y su relación con los contaminantes orgánicos e inorgánicos
ARGUMEDO-DELIRA, Rosalba;ALARCóN, Alejandro;FERRERA-CERRATO, Ronald;PEA-CABRIALES, Juan José;
Revista internacional de contaminación ambiental , 2009,
Abstract: the trichoderma fungal species have been fully characterized due to their application to agriculture since they are important antagonists for several horticultural plant pathogens. in contrast, the behavior and the effects of these fungi at contaminated soils have been scarcely studied. this review compiles updated information about the interactions among trichoderma species and organic (petroleum hydrocarbons, explosives, and pesticides) and inorganic (heavy metals and cyanide) pollutants in order to know their potential for remediating contaminated environments. nevertheless, for such purposes, it is needed further experimental research based on applying trichoderma species either to study their physiological, biochemical and molecular responses when exposed to several types of pollutants, or to assess their potential application into the several processes of bioremediation.
Validez de dos pruebas para evaluar la percepción materna del peso del hijo
Flores-Pea,Yolanda; Trejo-Ortiz,Perla M; Gallegos-Cabriales,Esther C; Cerda-Flores,Ricardo M;
Salud Pública de México , 2009, DOI: 10.1590/S0036-36342009000600007
Abstract: objetive: to assess maternal perception of their children weight using words (pp) and using images (pi) and evaluate the validity of the two tests by determining their sensitivity and specificity. material and methods: a total of 418 mother-child diads were selected from urban areas in the monterrey, nuevo león area. a questionnaire was administered to the mothers about perceptions regarding physical appearance and health. sensitivity and specificity were calculated and the body mass index measurement of the child was the gold standard. results: mothers underestimated overweight (sp) and obesity (ob), with 20.34% of mothers of children with sp and 7.41% of children with ob perceiving their child's condition with the pp test, and 62.71% of mothers of children with sp and 81.48% of those of children with ob perceiving it with the pi test. the tests had 12% sensitivity and 21% specificity for pp and 75% sensitivity and 15% specificity for pi. conclusions: the mothers of children with sp-ob underestimate the weight of their children. images are useful for mothers to recognize their child's condition.
EL GéNERO FúNGICO Trichoderma Y SU RELACIóN CON CONTAMINANTES ORGáNICOS E INORGáNICOS
Rosalba ARGUMEDO-DELIRA,Alejandro ALARCóN,Ronald FERRERA-CERRATO,Juan José PEA-CABRIALES
Revista internacional de contaminación ambiental , 2009,
Abstract: Las especies de hongos que pertenecen al género Trichoderma han sido plenamente caracterizadas por tener aplicación en el ámbito agrícola, principalmente para el control biológico de otros organismos patógenos que atacan a los cultivos. Sin embargo, los estudios sobre su comportamiento y su efecto en ambientes terrestres y acuáticos contaminados han sido escasamente estudiados. Esta revisión pretende hacer una compilación de toda la información actualizada disponible, respecto a la interacción de Trichoderma en presencia de contaminantes de origen orgánico (hidrocarburos del petróleo, explosivos y plaguicidas) e inorgánico (metales pesados y cianuro) con el fin de conocer el potencial de este grupo fúngico en la biorremediación de ambientes contaminados. No obstante, para tales fines, es necesario realizar investigaciones enfocadas en evaluar sus respuestas fisiológicas, bioquímicas y moleculares ante diferentes tipos de contaminantes, y definir con ello su posible aplicación en los diferentes sistemas de biorremediación.
Γ-sign in entropic cosmology
Samuel Lepe,Francisco Pea
Physics , 2012,
Abstract: We study a cosmology by considering entropic issues. We make a bare/effective description of the equation of state of the cosmic fluid through a bare (\omega)/effective (\omega_eff) conservation equation. In the bare case, where we have a non conserved equation of state for the cosmic fluid, we describe the change in the sign of the inhomogeneus term at different times of the cosmic evolution. We show that by a redefinition of the adiabatic \omega -parameter we can recover the usual scheme for the cosmic evolution. In the effective case we show also that if the evolution is driven by dust or cosmological constant, the universe evolves on the thermal equilibrium. Additionally, by incorporating a quantum correction only cosmological constant can drive an evolution on thermal equilibrium.
Papel de la expresión del receptor c-Met en la progresión del cáncer gástrico
Amemiya,Hideki; Menolascino,Francisco; Pea,Alix;
Investigación Clínica , 2010,
Abstract: the product of the proto-oncogene c-met (the c-met receptor) and its ligand, hepatocyte growth factor (hgf), have been implicated in the progression of gastric cancer. the aim of this study was to analyze the expression of c-met receptor, hgf and proliferating cell nuclear antigen (pcna) by the immunohistochemistry method of labeled streptavidin-biotin, as well as survival, and they were correlated with anatomopathological factors in stomach specimens of 40 patients, who underwent gastrectomy for gastric cancer in the department of general surgery, hospital central universitario “antonio maría pineda” in barquisimeto, venezuela, in 2001-2004. high expression of c-met receptor and pcna was observed in patients with advanced stages of gastric cancer (iii and iv) compared with early stages (i and ii) (p<0.01). there was also overexpression of the c-met receptor in histologic variables with low degree of differentiation, deeper tumor invasion into the submucosa, liver metastases and it is reported a lower survival rate in patients with increased receptor expression (+++ and ++++) when compared with patients with the lowest expression (+ and ++) (p<0.01). the expression of hgf was constant in both, advanced and early groups. the c-met receptor is associated with proliferation and cell migration in venezuelan patients with gastric cancer and could be used as a prognostic factor in this pathology.
Incremento de la Eficiencia en Centrales Termoeléctricas por Aprovechamiento de los Gases de la Combustión
Blanco,Jesús M; Pea,Francisco;
Información tecnológica , 2011, DOI: 10.4067/S0718-07642011000400003
Abstract: this paper presents a proposal for using the latent heat of the steam condensed in an economizer used to preheat the feeding water to the steam generator, with the aim of increasing the efficiency of thermal power plants. a novel methodology applied to power plants producing over 350 mw power plants and that use natural gas is developed. also, a detailed study of the different alternatives proposed is presented and their direct effects on the economic feasibility have been evaluated. increases up to 0.6 % in the global efficiency are obtained, besides short return investment periods, depending on the annual effective working hours of the power plant.
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