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Gastrointestinal stromal tumors: Thirty years experience of an Institution
Simone Arolfo, Paolo Mello Teggia, Mario Nano
World Journal of Gastroenterology , 2011,
Abstract: AIM: To report our experience of gastrointestinal stromal tumors (GISTs) during the last 29 years.METHODS: Thirty two cases of GIST referred to our Institution from the 1st January 1981 to the 10th June 2010 were reviewed. Metastases, recurrence and survival data were collected in relation to age, history, clinical presentation, location, size, resection margins and cellular features.RESULTS: Mean age was 63.7 years (range, 40-90) and incidence was slightly higher in males (56%). R0 resection was performed in 90.7% of cases, R1 in 6.2% (2 cases) and R2 in 3.1% (one case). Using Fletcher’s classification 8/32 (25%) had high risk, 9/32 (28%) intermediate and 15/32 (47%) low risk tumors. Follow-up varied from 1 mo to 29 years, with a median of 8 years; overall survival was 75% (24/32), disease-free survival was 72% and tumor-related mortality was 9.3%. Three patients with high risk GIST were treated with imatinib mesylate: one developed a recurrence after 36 mo, and 2 are free from disease at 41 mo.CONCLUSION: Surgical treatment remains the gold standard therapy for resectable GISTs. Pathological and biological features of the neoplasm represent the most important factors predicting the prognosis.
Validación de un método de selección para rendimiento en alfalfa basado en la depresión por endocría
Arolfo,V.; Odorizzi,A.; Basigalup,D.; Balzarini,M.;
Agriscientia , 2011,
Abstract: rapid inbreeding depression in alfalfa is due to loss of intraallelic interactions in tri- and tetraallelic plants. these plants could be identified by using a s1 progeny test and then combined into a higher yielding synthetic variety. the objective of this study was to evaluate the usefulness of s1 progeny test to identify tri and tetraallelic genotypes. three alfalfa synthetic experimental populations (pse) were developed by applying three selection methods to an original plant population (po). the first one, selected those plants whose s1 progenies exhibited higher inbreeding depression (≥65%) on forage production; the second one, selected the plants of the po that did not produce s1 seed; the last one, consisted on traditional phenotypic selection of po plants with higher forage yield (15% superior). the elite were manually intercrossed and harvested to produce pse 1, 2 and 3, respectively. accumulated forage yield was analyzed for each pse and po during the season. all the pse produced more (p<0.05) than the po; however, pse 1 was no different from pse 3. data were also used to estimate variance components. the heritability (h) reached a value of 0.86.
Análisis de la variabilidad de caracteres de raíz en poblaciones de alfalfa (Medicago sativa L.) con alto número de raíces laterales
Odorizzi,A.; Basigalup,D.; Arolfo,V.; Balzarini,M.;
Agriscientia , 2008,
Abstract: in order to provide some level of tolerance to the alfalfa root curculio in argentina, the improvement directed to increasing the number of secondary roots could be important. the objectives of this work were to estimate under four environmental conditions, variance components, trait heritabilities (h) and correlations among aerial and root traits in 10 alfalfa populations ranging from 6 to 9 fall dormancy, obtained by the alfalfa breeding program at the exp. stn. of manfredi- inta. the evaluated traits were average forage yield per cut (bp), taproot diameter (dp), number of lateral roots (nrlr), lateral root diameter (drlr) and branched-type root system (r). considerable variation for all traits was detected across all environments. there was no correlation between bp and most of root traits in almost every environmental condition, indicating that selection for yield and root traits could be independently managed. under irrigation, dp was positively (r =0,47; p<0,01) correlated with bp. both drlr and nrlr exhibited little variability and appeared to be little or not influenced by the environment. non-dormant populations had the lowest number of secondary roots, while the moderately-dormant populations presented the highest numbers. r reached a much higher expression under dryland conditions than under irrigation. bp and dp had high h values.
Efectos del cultivo de soja transgénica en siembra directa sobre la taxocenosis de ácaros edáficos en Haplustoles del centro de Córdoba
Arolfo,Romina Vanesa; Bedano,José Camilo; Becker,Analía Rosa;
Ciencia del suelo , 2010,
Abstract: the lack of mechanical mixing of stubble with mineral soil under no-tillage means that this management technique depends mainly on soil organisms to function properly, resembling natural ecosystems. mites are one of the most abundant and diverse groups of soil mesofauna. the aim of this study was to evaluate changes in mite taxocenosis produced by soybean monoculture under no-tillage with respect to the original natural grassland taxocenosis, in typic haplustolls of general deheza basin, córdoba. changes in soil properties related to these organisms were also evaluated. the no-tillage system led to a decrease in mite abundance in litter and soil and changes in the dominance of different taxa: natural grasslands were dominated by oribatida and managed sites were dominated by prostigmata. in this sense the mesofauna of no-tillage sites are more similar to those of tilled land than to those of natural soils. it is suggested that the higher bulk density, the lower soil organic matter and moisture content of managed soils, the agrochemical load and the low return of soybean residues are the factors that best explain the differences in faunal communities. the changes observed in mite taxocenosis affect the litter decomposition process, resulting in a decrease in soil quality.
Análisis de la variabilidad de caracteres de raíz en poblaciones de alfalfa (Medicago sativa L.) con alto número de raíces laterales Root traits variability in alfalfa (Medicago sativa L.) populations with a high number of lateral roots
A. Odorizzi,D. Basigalup,V. Arolfo,M. Balzarini
Agriscientia , 2008,
Abstract: Para atenuar el da o provocado por los gorgojos de la alfalfa en la Argentina, el mejoramiento orientado al aumento del número de raíces laterales puede ser importante. Los objetivos de este trabajo fueron estimar bajo cuatro condiciones ambientales, componentes de varianza, heredabilidad en sentido amplio (H) y correlaciones entre biomasa aérea y caracteres de raíz en 10 poblaciones de alfalfa de grado 6 a 9 de reposo invernal, mejoradas por sistema de raíz ramificada en la E.E.A. Manfredi-INTA. Los caracteres evaluados fueron: rendimiento de biomasa promedio (BP), diámetro de raíz pivotante (DP), número de raíces laterales (NRLR), diámetro de raíces laterales (DRLR) y sistema radicular tipo ramificado (R). Hubo ausencia de correlación entre BP y los caracteres de raíz en la mayoría de los ambientes, indicando que se debe seleccionar por ambos caracteres en forma específica e individual. En ambientes con riego, DP fue el que más se correlacionó con BP (r =0,47; p <0,01). DRLR y NRLR no presentaron gran variabilidad y serían los menos influenciados ambientalmente. Las poblaciones sin reposo invernal presentaron menor grado de ramificación que aquellas con reposo invernal intermedio. R se expresó en menor medida bajo riego que en secano. BP y DP tuvieron los mayores valores de H. In order to provide some level of tolerance to the alfalfa root curculio in Argentina, the improvement directed to increasing the number of secondary roots could be important. The objectives of this work were to estimate under four environmental conditions, variance components, trait heritabilities (H) and correlations among aerial and root traits in 10 alfalfa populations ranging from 6 to 9 fall dormancy, obtained by the alfalfa breeding program at the Exp. Stn. of Manfredi- INTA. The evaluated traits were average forage yield per cut (BP), taproot diameter (DP), number of lateral roots (NRLR), lateral root diameter (DRLR) and branched-type root system (R). Considerable variation for all traits was detected across all environments. There was no correlation between BP and most of root traits in almost every environmental condition, indicating that selection for yield and root traits could be independently managed. Under irrigation, DP was positively (r =0,47; p<0,01) correlated with BP. Both DRLR and NRLR exhibited little variability and appeared to be little or not influenced by the environment. Non-dormant populations had the lowest number of secondary roots, while the moderately-dormant populations presented the highest numbers. R reached a much higher expression under dryla
Evaluación de da o de gorgojos en poblaciones de alfalfa (Medicago sativa L.) con alto número de raíces laterales Evaluation of root curculio/weevil damage in alfalfa (Medicago sativa L.) populations with large numbers of lateral roots
A. S. Odorizzi,V. Arolfo,D. H. Basigalup
Agriscientia , 2011,
Abstract: El aumento del número de raíces laterales a través del mejoramiento puede ser importante para reducir el da o provocado por el complejo de gorgojos de la alfalfa. El objetivo fue evaluar, en cuatro ambientes (siembras de oto o y primavera con y sin riego), el comportamiento de 10 poblaciones seleccionadas por alto número de raíces laterales. Los caracteres evaluados fueron: categoría (Cat) de da o de gorgojos (de 1 = sin da o a 5 = da o severo), rendimiento promedio de forraje (BP), número de raíces secundarias (NRLR) y diámetro de raíces laterales (DRLR). Las poblaciones s755, s545 y s614 presentaron los mayores valores de DRLR y NRLR, el menor da o de gorgojos (Cat 2+3) y la mayor variabilidad para los caracteres estudiados. Las poblaciones s545 y s616 exhibieron el mayor DRLR y el menor NRLR, respectivamente. Las condiciones de riego propiciaron un menor da o, y fueron menos afectadas en estos ambientes las poblaciones s545, s614 y s617; por el contrario, las poblaciones s461, s755, s463 resultaron las más afectadas. Los da os más severos (Cat 4+5) se observaron en secano y las poblaciones s618 y s616 fueron las más afectadas; sólo bajo estas condiciones el mayor da o se correlacionó con menor BP. Increasing the number of lateral roots through breeding may be important to reduce the damage caused by the root curculio complex in alfalfa in Argentina. The objective was to evaluate the performance of ten alfalfa experimental populations selected for their large number of lateral roots under four environmental conditions (fall and spring planting with or without irrigation). The evaluated traits were curculio damage (Categories (Cat) 1 = no damage to 5 = very severe damage), dry matter yield (BP), number of secondary roots (NRLR), and diameter of lateral roots (DRLR). Populations s755, s545 and s614 had the highest values for DRLR and NRLR, the least damage from weevil (Cat 2 +3), and the largest variability (mean square) for all the traits. Populations s545 and s616 exhibited the highest DRLR and the lowest NRLR, respectively. Irrigation conditions led to lesser curculio damage, with populations s545, s614 and s617 being the least affected, and populations s461, s755 and s463, the most affected. The highest damage (Cat 4 +5) was observed under rainfed conditions (dryland), with populations s618 and s616 as the most affected by the root curculio complex. Only under these conditions the highest curculio damage was correlated with lowest BP.
Validación de un método de selección para rendimiento en alfalfa basado en la depresión por endocría Validation of a selection technique for improving alfalfa forage yield based on inbreeding depression
V. Arolfo,A. Odorizzi,D. Basigalup,M. Balzarini
Agriscientia , 2011,
Abstract: La rápida depresión por endocría en alfalfa obedece a la pérdida de interacciones alélicas intra-locus en plantas tri y tetraalélicas. éstas podrían identificarse por una prueba de autofecundación y luego combinarse en una variedad sintética con mayor rendimiento forrajero. El objetivo de este trabajo fue evaluar la utilidad de la prueba de progenie S1 para identificar genotipos tri y tetraalélicos. Se desarrollaron tres poblaciones sintéticas experimentales (PSE) de alfalfa según tres métodos de selección, partiendo de una población original (PO). El primero, seleccionando las plantas madres que presentaron mayor depresión por endocría (≥65%) en el rendimiento de sus progenies S1; el segundo, seleccionando las plantas de la PO que no formaron semilla S1; el último consistió en la selección fenotípica tradicional de las plantas de la PO con mayores rendimientos (15% superior). Las seleccionadas fueron polinizadas y cosechadas manualmente, conformando las PSE 1, 2 y 3, respectivamente. Se evaluó la producción de forraje acumulada de cada PSE y PO durante la temporada. Todas las PSE superaron (p<0,05) a la PO, aunque la PSE 1 no se diferenció estadísticamente de la PSE 3. Se estimaron los componentes de la varianza. La heredabilidad (H) alcanzó un valor de 0,86. Rapid inbreeding depression in alfalfa is due to loss of intraallelic interactions in tri- and tetraallelic plants. These plants could be identified by using a S1 progeny test and then combined into a higher yielding synthetic variety. The objective of this study was to evaluate the usefulness of S1 progeny test to identify tri and tetraallelic genotypes. Three alfalfa synthetic experimental populations (PSE) were developed by applying three selection methods to an original plant population (PO). The first one, selected those plants whose S1 progenies exhibited higher inbreeding depression (≥65%) on forage production; the second one, selected the plants of the PO that did not produce S1 seed; the last one, consisted on traditional phenotypic selection of PO plants with higher forage yield (15% superior). The elite were manually intercrossed and harvested to produce PSE 1, 2 and 3, respectively. Accumulated forage yield was analyzed for each PSE and PO during the season. All the PSE produced more (p<0.05) than the PO; however, PSE 1 was no different from PSE 3. Data were also used to estimate variance components. The heritability (H) reached a value of 0.86.
Efectos del cultivo de soja transgénica en siembra directa sobre la taxocenosis de ácaros edáficos en Haplustoles del centro de Córdoba Effects of transgenic soybean cultivation under no-tillage on soil mite taxocenosis in Haplustolls of Central Córdoba
Romina Vanesa Arolfo,José Camilo Bedano,Analía Rosa Becker
Ciencia del Suelo , 2010,
Abstract: Los sistemas de siembra directa carecen de mezclado mecánico de los rastrojos con el suelo mineral por lo que dependen principalmente de los organismos del suelo para su funcionamiento adecuado, asemejándose a ecosistemas naturales. Los ácaros son uno de los grupos más abundantes y diversos de la mesofauna del suelo. El objetivo de este trabajo fue evaluar los cambios en la taxocenosis de ácaros producto del monocultivo de soja en siembra directa, con respecto a la taxocenosis original de pastizales naturales, en Haplustoles típicos de la cuenca General Deheza, Córdoba. Adicionalmente se evaluaron los cambios en las propiedades del suelo que se relacionan con estos organismos. La soja en siembra directa produjo una disminución de la abundancia de ácaros de la hojarasca y el suelo y cambios en la dominancia de los diferentes taxones: los sitios naturales estuvieron dominados por oribátidos, mientras que en los sitios con manejo dominaron los prostigmatas. Así, con respecto a estas características, la mesofauna de los sitios con soja en siembra directa se asemeja más a la de suelos cultivados con labranza, que a la de sitios naturales. Se sugiere que la mayor densidad aparente, el menor contenido de materia orgánica y humedad del suelo manejado, los agroquímicos aplicados y el aporte menor de rastrojos por parte de la soja, son los factores que explican las diferencias encontradas en las comunidades faunísticas. Los cambios observados en la taxocenosis de ácaros afectarían el proceso de descomposición de restos vegetales y por tanto se traducirían en una disminución de la calidad del suelo. The lack of mechanical mixing of stubble with mineral soil under no-tillage means that this management technique depends mainly on soil organisms to function properly, resembling natural ecosystems. Mites are one of the most abundant and diverse groups of soil mesofauna. The aim of this study was to evaluate changes in mite taxocenosis produced by soybean monoculture under no-tillage with respect to the original natural grassland taxocenosis, in Typic Haplustolls of General Deheza basin, Córdoba. Changes in soil properties related to these organisms were also evaluated. The no-tillage system led to a decrease in mite abundance in litter and soil and changes in the dominance of different taxa: natural grasslands were dominated by Oribatida and managed sites were dominated by Prostigmata. In this sense the mesofauna of no-tillage sites are more similar to those of tilled land than to those of natural soils. It is suggested that the higher bulk density, the lower soil org
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