196,277 research outputs found
Validación de DEPs en toros Brangus a partir una muestra diseñada de la performance de su progenie
No full textEl objetivo principal de un programa de evaluación genética de una raza bovina es calcular y difundir las DEPs ( acronimo de "Diferencias Esperadas entre Progenies") de reproductores destacados para caracteres económicamente relevantes.Fil: Munilla Leguizamon, Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Animal; ArgentinaFil: Buitrago, M.. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Animal; Argentina42º Congreso Argentino de Producción AnimalBahía BlancaArgentinaAsociación Agentina de Producción Anima
Approximate Reductions of Rational Dynamical Systems in CLUE
No full textIn life sciences, deriving insights from dynamical systems can be challenging due to the large number of state variables involved. To address this, model reduction techniques can be used to project the system onto a lower-dimensional state space. CLUE is a tool that computes exact reductions for rational systems of ordinary differential equations. In this paper, we present an extension of CLUE to include approximate reductions which allow for larger aggregating power at the expense of a bounded error. Additionally, our extension includes new functionalities such as an interface to the model database ODEBase repository and simulation techniques for exploratory analyses
Similaridade genética entre acessos de Panicum maximum Jacq., determinada por marcadores RAPD.
No full textAs pastagens de gramíneas constituem a base da produção de carne e leite no Brasil tropical, com o gênero Panicum maximum Jacq. figurando entre as forrageiras de maior importância devido à sua alta produção, qualidade, facilidade de propagação e palatabilidade para o gado. Desde 1984, a Embrapa Gado de Corte tem realizado trabalhos de seleção e melhoramento genético desta espécie, resultando no lançamento de três cultivares de grande aceitação no mercado pecuário. A coleção introduzida de mais de 400 acessos apomíticos da espécie permitiu a seleção de vários acessos promissores com base em suas características agronômicas e morfológicas. Atualmente, diversas técnicas de marcadores moleculares são utilizadas para caracterizar o germoplasma e localizar regiões do genoma associadas a características agronômicas relevantes. Entre estas técnicas, o RAPD (Random Amplified Polymorphism DNA) destaca-se pela sua rapidez, simplicidade, necessidade de pequena quantidade de DNA e custo relativamente baixo. Tradicionalmente, a diversidade genética em forrageiras era quantificada por descritores morfológicos, influenciados por fatores ambientais e que nem sempre refletem características genéticas, além de serem trabalhosos e exigirem plantas adultas. A utilização de marcadores moleculares nestas espécies, juntamente com a identificação de acessos superiores agronomicamente, torna mais eficiente a seleção de progenitores e híbridos em programas de melhoramento genético. Este estudo objetivou caracterizar acessos de Panicum maximum, previamente selecionados por suas características agronômicas, utilizando marcadores RAPD para determinar a similaridade genética entre eles.T107. Na publicação: Gisele Leguizamon
Approximate Constrained Lumping of Polynomial Differential Equations
No full textIn life sciences, deriving insights from dynamic models can be challenging due to the large number of state variables involved. To address this, model reduction techniques can be used to project the system onto a lower-dimensional state space. Constrained lumping can reduce systems of ordinary differential equations with polynomial derivatives up to linear combinations of the original variables while preserving specific output variables of interest. Exact reductions may be too restrictive in practice for biological systems since quantitative information is often uncertain or subject to estimations and measurement errors. This might come at the cost of limiting the actual aggregation power of exact reduction techniques. We propose an extension of exact constrained lumping which relaxes the exactness requirements up to a given tolerance parameter ε. We prove that the accuracy, i.e., the difference between the output variables in the original and reduced model, is in the order of ε. Furthermore, we provide a heuristic algorithm to find the smallest ε for a given maximal approximation error. Finally, we demonstrate the approach in biological models from the literature by providing coarser aggregations than exact lumping while accurately capturing the original system dynamics
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Les Guaranis / Les Guaranis
No full textComprend : CANCION : Mexique / Ramirez - MORENA RESA IVOTI : Paraguay / Melga Chase - RECUERDO DE MAR DEL PLATA : Argentine ; Zamba / Pella et Perez Cardozo - CHE VALLE MI : Paraguay / Eladio Martinez - YCUA POTRERO : Paraguay / Lorenzo Leguizamon - LA DEL BOULEVARD : Argentine - cueca / Miranda - PARANAMBU : Paraguay / Francisco Marin - TARDES ASUNCENAS : Paraguay / N. R. Valdovinos et T. Noguera - MARANJITAY : Bolivie - carnavalito / Virgilio Carmona - PILARCITA : Paraguay / Lorenzo Leguizamon - MIMOSA : Paraguay / Cirito Rivero - MI PABELLON : Argentine / Felix Perez Cardozo - FLORIPA MI : Paraguay / Fernando Rivarola - MI SANJUANINA : Argentine - Cueca / Carlos M. Ocampo - NDE RESA CUARAJHI'AME : Paraguay / T. S. Mangelos ; Melga Chase - ANATUYENSE : Argentine / Lorenzo Leguizamon - DEBAJO DE LA MORERA : Argentine - Zamba / Virgilio CarmonaBnF-Partenariats, Collection sonore - BelieveContient une table des matière
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Promoting effect of rhodium on Co/ZnAl2O4 catalysts for the catalytic combustion of hydrocarbons
No full textZinc aluminate (ZnAl) was used as support to obtain a series of rhodium-modified Co-ZnAl catalysts for the catalytic oxidation of propane and naphthalene. The catalysts were characterized by various techniques including N2 adsorption (BET), X-ray diffraction (XRD), temperature programmed reduction (TPR), diffuse reflectance spectroscopy (DRS), FTIR and X-ray photoelectron spectroscopy (XPS), to correlate chemical and physical characteristics with catalytic properties. TPR and XPS techniques show the presence of segregated cobalt compounds, as well as cobalt species interacting with the support. Segregated cobalt species are considered responsible for the catalytic activity, due to their high reducibility. The addition of Rh promotes the reducibility of the cobalt compounds yielding to an increase in the surface content of Co2+. For propane oxidation, the best activity shown by the Rh(0.5)Co(5)-ZnAl sample could be associated with a synergic effect between rhodium and cobalt species. No specific effects were revealed due to the addition rhodium for the naphthalene oxidation
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