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Determinación de la Curva de Dilución de Nitrógeno en Diferentes Fases Fenológicas del Girasol
de Caram,Gladis A; Angeloni,Patricia; Prause,Juan;
Agricultura Técnica , 2007, DOI: 10.4067/S0365-28072007000200009
Abstract: the concentration of nitrogen which allows a crop to reach its maximum growth rate is called critical concentration. this concentration varies according to the aerial biomass considered, as when this increases, there is a dilution effect of the nitrogen in the plant. the aim of this work was to characterize the nutritional state of foliar nitrogen in two sunflower hybrids (helianthus annuus l.), at different phenological phases, using the nitrogen dilution curve in total aerial dry matter. the treatment was applied to two hybrids, guarani dc and dksol 4040, sown in four furrows by plot, making three replicates per each hybrid. the sampling was made taking three plants per treatment for each replicate, and in four phenological phases: v6; v10; r1; r5.5 and r6. dry matter, nitrogen content and foliar nitrogen were determined by the semi-microkjeldahl method (b). by using the nitrogen dilution curve it could be detected that the content of nitrogen in both hybrids was higher than the required quantity for the maximum growth rate till the flowering, and that the nitrogen values obtained in r1 and r6 were under the curve of dilution of equation (a), indicating a deficit of nitrogen. this methodology is not practical to judge the nitrogenous state of the crop in the stages after flowering, because the composition of the dry matter changes after this phase and the oil synthesis phase begins.
Determinación de la Curva de Dilución de Nitrógeno en Diferentes Fases Fenológicas del Girasol Determination of the Nitrogen Dilution Curve in Different Phenological Phases of Sunflower
Gladis A de Caram,Patricia Angeloni,Juan Prause
Agricultura Técnica , 2007,
Abstract: La concentración de nitrógeno que le permite al cultivo alcanzar la tasa de crecimiento máxima se denomina concentración crítica; estas concentraciones varían de acuerdo a la biomasa aérea considerada, ya que a medida que ésta aumenta se produce un efecto de dilución del nitrógeno en la planta. El objetivo del trabajo fue caracterizar el estado nutricional en nitrógeno foliar de dos híbridos de girasol (Helianthus annuus L.), en distintas fases fenológicas, empleando la curva de dilución del nitrógeno en la materia seca aérea total. Los tratamientos fueron dos híbridos, GUARANI DC y DKSOL 4040, que se sembraron a razón de cuatro surcos por parcela, realizándose tres repeticiones por híbrido. El muestreo se realizó tomando tres plantas por tratamiento para cada repetición, en cinco fases fenológicas: V6; V10; R1; R5.5 y R6. Se determinaron materia seca, contenido de nitrógeno y nitrógeno foliar por el método semi-microKjeldahl. Utilizando la curva de dilución del nitrógeno se detectó que el contenido de nitrógeno en ambos híbridos fue superior a la cantidad necesaria para el cultivo hasta la floración y que los valores de nitrógeno obtenidos en R1 y R6, estuvieron por debajo de la curva de dilución. Esta metodología no es utilizable para juzgar el estatus de N del cultivo en estadios posteriores a floración, ya que después de dicha fase, cambia la composición de la materia seca, dando comienzo a la etapa de la síntesis de aceite The concentration of nitrogen which allows a crop to reach its maximum growth rate is called critical concentration. This concentration varies according to the aerial biomass considered, as when this increases, there is a dilution effect of the nitrogen in the plant. The aim of this work was to characterize the nutritional state of foliar nitrogen in two sunflower hybrids (Helianthus annuus L.), at different phenological phases, using the nitrogen dilution curve in total aerial dry matter. The treatment was applied to two hybrids, GUARANI DC and DKSOL 4040, sown in four furrows by plot, making three replicates per each hybrid. The sampling was made taking three plants per treatment for each replicate, and in four phenological phases: V6; V10; R1; R5.5 and R6. Dry matter, nitrogen content and foliar nitrogen were determined by the semi-microKjeldahl method (B). By using the nitrogen dilution curve it could be detected that the content of nitrogen in both hybrids was higher than the required quantity for the maximum growth rate till the flowering, and that the nitrogen values obtained in R1 and R6 were under the curve of dilution o
Phosphoinositide and phospholipid phosphorylation and hydrolysis pathways
—Organophosphate and organochlorine pesticides effects
 [PDF]

Teresa Fonovich, Gladis Magnarelli
Advances in Biological Chemistry (ABC) , 2013, DOI: 10.4236/abc.2013.33A004
Abstract:

Phospholipid and phosphoinositide phosphorylation pathways have been shown to be of crucial importance on producing lipid mediators. The earlier findings reported on lipid molecules playing roles in different metabolic pathways used to assign them the exclusive role of second messenger generators. Several researchers have recently described how direct interaction of phospholipids and phosphoinositides with molecules or organelles, without the need for producing second messenger molecules, is responsible for their mechanism of action. Organophosphate and organochlorine pesticide toxicity mechanisms have been extensively studied in relation to their well known effects on cholinesterase activities and on the alterations of electric activity in the nervous system of different organisms respectively. There is little but consistent evidence that some compounds, including in both groups of pesticides, are also able to interact with phospholipid and phosphoinositide phosphorylation pathways in several organisms and tissues. The present review consists of an actualization of basic research on phospholipid and phosphoinositide phosphorylation and hydrolysis pathways, as well as a description of some reported evidences for the effects of the above mentioned pesticides on them.

Protein phosphorylation pathways disruption by pesticides  [PDF]
Gladis Magnarelli, Teresa Fonovich
Advances in Biological Chemistry (ABC) , 2013, DOI: 10.4236/abc.2013.35050
Abstract: Phosphosites in the human proteome represent an excellent source of potential biomarkers of pesticide toxicity. In fact, experimental animal models as well as in vitro studies have revealed phosphorylation disruption associated to metabolic regulation, hormone signaling, neuronal function and differentiation, cell survival and death. Due to their estrogen-mimicking ability, pesticides are considered as prime etiological suspects of increasing tumor incidence. Evidences of alterations in the signal transduction pathways involved in the tumor progression stage of pesticides were also provided. Despite progress in understanding the effect of pesticides on the human phosphorproteome and their health outcomes, it remains a complex issue to be studied. By now, the potential impact of pesticides in epigenetic phosphorylation pathways remains poorly explored. In addition, studies involving pesticides mixtures effects are needed. This review updates and provides a comprehensive discussion on the molecular and biochemical events underlying protein phosphorylation pathway disruption caused by pesticides most frequently detected in human tissues and fluids, such as organochlorine pesticides and organophosphates. The link between epidemiological studies and experimental approaches is also considered. Future challenges, such as micro-array phosphoproteome studies to complement gene expression arrays to understand the mechanisms involved in pesticide toxicology are briefly discussed.
The Strategic Plan for Tourism Development in Italy
Silvia ANGELONI
Economia : Seria Management , 2013,
Abstract: Conceptual works on tourism destination competitiveness affirm the central importance of planning the process of value creation within destination. Italy is an emblematic case of why and how a leading tourism destination may lose competitiveness along the years. Up to the 1980s Italy was in fact the top international tourism destination, but then such ranking gradually decreased, because of more complexity of sector and, over all, because of marginality of tourism in the government agenda and more in general of the country. After years of strategic myopia, Italy finally has a tool that formalizes its vision and indicates the key factors that can be leveraged in order to regain ground. In 2013, Italy adopted a National Strategic Plan. Therefore, this paper aims to describe an important turning point in tourism policies for the economic and cultural development of Italy. The research highlights the problematic areas of Italy’s tourism industry and explains how a new approach should make the Italian destination able to successfully compete on the international tourism market.
Evaluación de géneros micotoxigénicos en yerba mate elaborada
Jerke,Gladis; Horianski,Marta A.; Salvatierra,Karina A.;
Revista de ciencia y tecnolog?-a , 2009,
Abstract: the quality and care of the processing of yerba mate is crucial to maintain the product organoleptic and microbiological qualities unchanged.the objective of this work was the study the mycological contamination of manifactured yerba maté, evaluating the presence of micotoxigenic genera. thirty six samples of manifactured yerba maté commercialized in posadas, misiones, were processed during 2005. both the fungal count and the characterization of genera present were carried out. the fungal count was of 6.1 x 103 ufc/g, in average, with a higher incidence of moulds (89 %) than of yeasts. we isolated 24 genera of fungi with a predominance of aspergillus, penicillium, fusarium and emericella among others. six yeasts genera were characterized by a predominance of rhodotorula and candida. the incidence of mycotoxigenic genera was 83 % for aspergillus spp, penicillium spp 26 % and 15 % for fusarium spp. the results are consistent with previous studies on the same substrate and similar ones as black tea.
Silicon, a Possible Link between Environmental Exposure and Autoimmune Diseases: The Case of Rheumatoid Arthritis
Cesar A. Speck-Hernandez,Gladis Montoya-Ortiz
Arthritis , 2012, DOI: 10.1155/2012/604187
Abstract: Silicon is one of the most common chemicals on earth. Several compounds such as silica, asbestos, silicone or, nanoparticles are built from tetrahedral units with silicon as the central atom. Despite these, structural similarities, they have rarely been analyzed as a group. These compounds generate significant biological alterations that include immune hyperactivation, production of the reactive species of oxygen and tissue injury. These pathological processes may trigger autoimmune responses and lead to the development of rheumatoid arthritis. Populations at risk include those that constantly work in industrial process, mining, and agriculture as well as those that undergo silicone implants. Herein a review on the main features of these compounds and how they may induce autoimmune responses is presented.
Construcción de Conjuntos B2[2] Finitos
Gladis J. Escobar,Carlos A. Trujillo S.,Oscar H. Zemanate
Matemáticas : Ense?anza Universitaria , 2004,
Abstract: Un conjunto de enteros positivos A se llama un conjunto B2[g] si, para todo entero positivos, la ecuación a+a′=s,a,a′∈Aya≤a′ tiene a lo sumo g soluciones. Si F2,g(N) denota el máximo número de enteros que pueden seleccionarse de {1,2,,N}para formar un conjunto B2[g], se conoce que l′ mN→∞F2,1(N)√N=1. Cuando g≥ 2 no se conoce la existencia de l′ mN→∞F2,g(N)√N. En este artículo se demuestra que 4√7≤l′ minfN→∞F2,2(N)√N y además se prueba que no es posible mejorar esta cota si se recurre a los métodos dec onstrucción conocidos.
Silicon, a Possible Link between Environmental Exposure and Autoimmune Diseases: The Case of Rheumatoid Arthritis
Cesar A. Speck-Hernandez,Gladis Montoya-Ortiz
Arthritis , 2012, DOI: 10.1155/2012/604187
Abstract: Silicon is one of the most common chemicals on earth. Several compounds such as silica, asbestos, silicone or, nanoparticles are built from tetrahedral units with silicon as the central atom. Despite these, structural similarities, they have rarely been analyzed as a group. These compounds generate significant biological alterations that include immune hyperactivation, production of the reactive species of oxygen and tissue injury. These pathological processes may trigger autoimmune responses and lead to the development of rheumatoid arthritis. Populations at risk include those that constantly work in industrial process, mining, and agriculture as well as those that undergo silicone implants. Herein a review on the main features of these compounds and how they may induce autoimmune responses is presented. 1. Introduction Rheumatoid arthritis (RA) is a common autoimmune disease (AD), characterized by synovial inflammation, autoantibody production, cartilage and bone destruction, and other systemic complications including cardiovascular, pulmonary, and psychological disability. The etiology is unknown although it involves a complex interplay among genetic and epigenetic factors as well as environmental exposure [1]. The influence of several environmental stressors has been broadly described in processes that may trigger autoimmune responses which lead to RA. Habitual smoking and certain previous infections (i.e., Porphyromonas gingivalis, Epstein-Barr virus, cytomegalovirus, Proteus sp., and Escherichia coli) are the most significant associations that have been found for this disease [1, 2]. In the case of a particular class of chemical compounds, long exposure to them has been related to RA, and, in spite of their similar biophysical and biochemical properties, they have rarely been analyzed as a group. This is the case with the silicon-derived compounds (silica, asbestos, silicone, and nanoparticles; for details see Table 1). All of these compounds are built from tetrahedral units with silicon as the central atom and are basically extended networks based on Si–O–Si bonds [3]. In human tissues, silicon is associated with glycosaminoglycans that covalently attach to core proteins to form proteoglycans, which are part of the connective tissue matrix [4]. Table 1: Characteristics and effects of silicon-derived compounds. The goal of this paper is to discuss the chemical features of these kinds of compounds and to describe the biological and immunological alterations that are generated in vivo. These alterations may trigger autoimmune responses and lead to
55Mn NMR and magnetization studies of La0.67Sr0.33MnO3 thin films
A. A. Sidorenko,G. Allodi,R. De Renzi,G. Balestrino,M. Angeloni
Physics , 2005, DOI: 10.1103/PhysRevB.73.054406
Abstract: 55Mn nuclear magnetic resonance and magnetization studies of the series of La0.67Sr0.33MnO3 thin films have been performed at low temperature. Two distinct lines were observed, at 322 MHz and 380 MHz, corresponding to two different phases, the former located at the interface, with localized charges, and the latter corresponding to the film bulk, with itinerant carriers (as it was also found in Ca manganite films). The spin-echo amplitude was measured as a function of a dc magnetic field applied either in the film plane or perpendicular to it. The field dependence of both the main NMR signal intensity and frequency shift is quite consistent with that calculated in a simple single domain model. The best fit to the model shows that magnetization rotation processes play a dominant role when the applied field exceeds the effective anisotropy field. Distinctly different magnetic anisotropies are deduced from the interface NMR signal.
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