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Search Results: 1 - 10 of 1657 matches for " Grizel; Rivas "
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Implementation of an in vitro bioassay as an indicator of the bionutrient FitoMas E
Díaz de Villegas,María Elena; Delgado,Grizel; Rivas,Mauricio; Torres,Esmérida; Saura,Maribel;
Ciencia e investigación agraria , 2011, DOI: 10.4067/S0718-16202011000200005
Abstract: seed bioassays are employed to determine the stimulatory effect of various biological products on the seed germination of plants used for the detection and control of toxic environmental contaminants. the objective of the present study was to design an in vitro bioassay to monitor the quality of the final production of fitomas e, a bionutrient derived from the sugar industry and produced by the instituto cubano de investigaciones de los derivados de la ca?a de azúcar by-products (icidca), by determining rates of seed germination and growth of lettuce (lactuca sativa l.) as an indicator plant. a significant effect of controllable factors under study (fitomas e concentration in lots and replicates of petri dishes) was determined by one-way and multifactor anova analysis. in all cases, the highest values of relative germination and growth occurred at a concentration of fitomas e of 0.1 ml l-1, with a marked increase in the growth of hypocotyl (rhg), which decreased at concentrations of 2.5 and 5 ml l-1. these results can be explained by the hormesis phenomenon, which is characterized by stimulation at low doses and inhibition at high doses. for a confidence level of p ≤ 0.05, there were no significant differences between petri dishes with lettuce seeds and lots in all responses tested. the bioassay method implemented in this study was fast, simple and reliable.
Dos enfoques clásicos para el estudio de la estratificación social y de las clases sociales
Ricardo Rivas Rivas
Espacio Abierto , 2008,
Abstract:
Evolutionary models for insertions and deletions in a probabilistic modeling framework
Elena Rivas
BMC Bioinformatics , 2005, DOI: 10.1186/1471-2105-6-63
Abstract: Probabilistic models of substitution events are well established, but there has not been a completely satisfactory theoretical framework for modeling insertion and deletion events.I have developed a method for extending standard Markov substitution models to include gap characters, and another method for the evolution of state transition probabilities in a probabilistic model. These methods use instantaneous rate matrices in a way that is more general than those used for substitution processes, and are sufficient to provide time-dependent models for standard linear and affine gap penalties, respectively.Given a probabilistic model, we can make all of its emission probabilities (including gap characters) and all its transition probabilities conditional on a chosen divergence time. To do this, we only need to know the parameters of the model at one particular divergence time instance, as well as the parameters of the model at the two extremes of zero and infinite divergence.I have implemented these methods in a new generation of the RNA genefinder QRNA (eQRNA).These methods can be applied to incorporate evolutionary models of insertions and deletions into any hidden Markov model or stochastic context-free grammar, in a pair or profile form, for sequence modeling.Probabilistic models are widely used for sequence analysis [1]. Hidden Markov models (HMMs) are a very large class of probabilistic models used for many problems in biological sequence analysis such as sequence homology searches [2-4], sequence alignment [5], or protein genefinding [6-8]. Stochastic context-free grammars (SCFGs) are another class of probabilistic models used for structural RNAs for problems such as RNA homology searches [9-13], RNA structure prediction [14,15], and RNA genefinding [16].Sequence similarity methods based on HMMs or SCFGs can take the form of profile or pair models and are very important for comparative genomics. These probabilistic methods for sequence comparison assume a certai
La docencia desde la investidura académica y la impostura fraudulenta
Rivas,Pedro;
Educere , 2009,
Abstract: the following text is a brief summary of reflections that aims to restore teaching conceived from a teaching invested in an authority that comes from the desire of knowing and the contribution of transforming the other, as it is transformed in itself into a pedagogic act of taking in a stream of dignified and respectful communication. this memorial attempts to highlight that the educational act directed by a teaching that overcomes routine and daily life and makes the learning subject visible will transcend in the search and achievement of integral development in the scholars. in order to be achieved, this purpose finds some obstacles in the practice when the intention of exercising teaching without authority and training is perverted. this disfiguration is turned into an impostor and fraudulent teaching because it is done from deceiving and deception.
Logro Educacional en Jóvenes y Clase Social de Origen: El Caso del Gran Concepción
Rivas,Ricardo;
Ultima década , 2008, DOI: 10.4067/S0718-22362008000100007
Abstract: this article, synthesizes the main theoretical and empirical elements of the construction of a scheme of classes based on the neoweberian principles of john goldthorpe, in order to observe the educational mobility of youth between the ages of 20 and 29, who come from homes pertaining to these established socio-occupacional classes, from the data base of the census of population and housing in chile from the year 2002. to this regard, results stand out as the presence of ascending educational mobility in the majority of the classes, the high probability of inheritance in parents with a basic cycle and the differences in probabilities of reaching for a higher education in each class when having one parent with a secondary education, and the other with only a basic education.
El joven Rafael Gutiérrez Girardot. Apuntes para una biografía intelectual: el descubrimiento de Jorge Luis Borges y su estimulante influencia
Rivas,Carlos;
Co-herencia , 2009,
Abstract: the article attempts to bring to light the intellectual stimulus felt by the essayist rafael gutiérrez girardot through his discovery of jorge luis borges' literature. to guide us in demonstrating this intellectual stimulation we will use some of girardot's earlies works, "notas de lectura a gottfried benn", which were published for the young colombian in the madrid-based magazine cuadernos hispanoamericanos. two amply significant aspects can be extracted from this stimulating influence: the first, of a reflexive manner, involves an aesthetic conception of intellectual labor; the second entails an attitude -an ethical ethoswhich teaches us that, as hispanic americans, we can manage the problems and worries that characterize the complex evolution of modern thought whit confidence, rigor and self-assurance.
Setenta y dos horas en Londres 38
Rivas,Patricio;
Revista de Estudios Sociales , 2006,
Abstract: based on direct references to his past in chile?during pinochet's dictatorship?the author presents a heart-rending testimony of the tortures and ill-treats he had to endure during the military repression.
RAFAEL GUTIéRREZ GIRARDOT EN LA REVISTA QUIMERA (1981-2003): Una antología ejemplar
Carlos Rivas
Revista Chilena de Literatura , 2011,
Abstract:
Logro educacional en jóvenes y clase social de origen: el caso del gran concepción
Ricardo Rivas
Ultima Década , 2008,
Abstract: Este artículo, sintetiza los principales elementos teóricos y empíricos de la construcción de un esquema de clases basado en los principios neoweberianos de John Goldthorpe para luego observar la movilidad educacional de los jóvenes entre 20 y 29 a os de hogares pertenecientes a dichas clases sociocupacionales establecidas, desde la base de datos del Censo de Población y Vivienda en Chile del a o 2002. Al respecto resaltan resultados como es la presencia de movilidad educacional ascendente en la mayoría de las clases, la alta probabilidad de herencia en padres con ciclo básico y la diferencia en las probabilidades de alcanzar educación superior en cada clase al tener un padre con ense anza básica y un padre con ense anza media.
“Setenta y dos horas en Londres 38” / “Seventy-Two Hours in London 38”
Patricio Rivas
Revista de Estudios Sociales , 2006,
Abstract: Based on direct references to his past in Chile—during Pinochet's dictatorship—the author presents a heart-rending testimony of the tortures and ill-treats he had to endure during the military repression.
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