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Search Results: 1 - 10 of 33696 matches for " Corina; Cortéz "
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La indagación científica como enfoque pedagógico: estudio sobre las prácticas innovadoras de docentes de ciencia en EM (Región de Valparaíso) Aproxima o à Indaga o Científica como Enfoque Pedagógico: Estudo sobre as práticas inovadoras de docentes de ciências, em aulas de educa o média/secundária, na Regi o de Valparaíso, Chile Approach to inquiry as orientation to science teaching: a study abo
Corina González-Weil,Mónica Cortéz,Paulina Bravo,Yasnina Ibaceta
Estudios Pedagógicos (Valdivia) , 2012,
Abstract: El presente trabajo refiere los resultados de un estudio cualitativo cuyo objetivo fue describir y comprender las prácticas de seis docentes de ciencia en Educación Secundaria que han logrado transformar su ense anza, aproximándose a un enfoque indagatorio. El enfoque metodológico empleado fue Grounded Theory, el cual se aplicó a la observación de 54 horas (cr.) de clase. El estudio aporta con información descriptiva y comprensiva sobre las características de las prácticas observadas, así como las condiciones que las permiten y las consecuencias que conllevan. Se finaliza discutiendo el impacto que este estudio tiene sobre la formación inicial y continua de docentes de ciencia de Educación Secundaria. O presente trabalho mostra os resultados de um estudo qualitativo, cuja finalidade é descrever e compreender as práticas de ensino de seis professores de ciências secundários, que vieram a transformar seus métodos de ensino, aproximando-os de uma técnica de questionamento, indaga o. O método usado foi o Grounded Theory, aplicado à observa o de 54 horas de aulas (cr.). Esta pesquisa contribui com informa o descritiva e detalhada sobre características das práticas observadas, assim como as circunstancias que as permitiram e suas conseqüências. Finalmente, nós discutimos as implica es que este estudo tem na forma o inicial e contínua de professores de ciências de nível médio/secundário. This research refers the results of a qualitative study which purpose was to describe and understand the teaching practices of six secondary science teachers who have transformed their teaching practice by applying an inquiry approach. The method used was Grounded Theory applied to the observation of 54 class hours (cr.). This research contributes with descriptive and comprehensive information about characteristics of the observed practices, as well as the conditions that allow them and their consequences. Finally, we discuss the implications that this study has on pre-service and in-service secondary science teacher education.
La indagación científica como enfoque pedagógico: estudio sobre las prácticas innovadoras de docentes de ciencia en EM (Región de Valparaíso)
González-Weil,Corina; Cortéz,Mónica; Bravo,Paulina; Ibaceta,Yasnina; Cuevas,Karen; Qui?ones,Paola; Maturana,Joyce; Abarca,Alejandro;
Estudios pedagógicos (Valdivia) , 2012, DOI: 10.4067/S0718-07052012000200006
Abstract: this research refers the results of a qualitative study which purpose was to describe and understand the teaching practices of six secondary science teachers who have transformed their teaching practice by applying an inquiry approach. the method used was grounded theory applied to the observation of 54 class hours (cr.). this research contributes with descriptive and comprehensive information about characteristics of the observed practices, as well as the conditions that allow them and their consequences. finally, we discuss the implications that this study has on pre-service and in-service secondary science teacher education.
Reproductive Trends in Cebu Cattle Grazing Rice Crop Residues in Colombian Tropical Dry Forest  [PDF]
Elisa Sierra-Montoya, Rolando Barahona-Rosales, Z. Tatiana Ruíz-Cortés
Open Journal of Forestry (OJF) , 2013, DOI: 10.4236/ojf.2013.34B003
Abstract:

The objective of this study was to describe the trend of reproductive performance of primiparous and multiparous cows that grazed rice crop residues located in a Dry Tropical Forest of Colombia, taking into account the rainfall pattern of the place. In this study, 89 primiparous and 309 multiparous Cebu cattle records were analyzed. Mean, mean standard deviation for age at first calving and open days of primipar-ous Cebu cattle were 41.05± 1.85 months and 269.7±36.25 days respectively. Confidence intervals (95%) for both reproductive parameters were 36.8-45.3 months and 202.7-336.6 days respectively. For multiparous Cebu cattle, the mean and mean standard deviation for open days and calving interval were 245.6±36.8 days and 17.5±0.9 months respectively. Confidence intervals 207.1-366.9 days and 13.9-20.7 months respectively. The mean rainfall since 1999 until 2012 was1202 mmper year. The reproduc-tive trend of the primiparous cattle showed an increasing behavior of age at first calving since 1999 until 2012, that can possibly be explained due to the decreasing behavior of the rainfall throughout the years, that can affect the nutritional value and offer of the grass that can grow in the borders of the crop, such as Guinea and Star grass, and eventually affect the body condition and weight necessary to be ready for the first estrous. An inverse behavior of open days occurred, showing a decreased trend along the last years of research. This fact could have happened due to the intensive use of the enriched rice straw with urea and molasses lately. Regarding to the reproductive trend of the multiparous cattle, there is no an evident pat-tern of it. Factors such as rainfall, temperature, nutrition and management should have affected it. Further research on this topic is needed.

Abstract
Silvia Pérez-Cortéz
Acta Botánica Venezuelica , 2005,
Abstract:
Abstract
Silvia Pérez-Cortéz
Acta Botánica Venezuelica , 2010,
Abstract:
Cambios intraestacionales en la circulación regional sobre México
Miguel Cortéz Vázquez,Jun Matsurnoto
Investigaciones geográficas , 2001,
Abstract:
Estudio Morfológico de la semilla de 51 especies del género Passiflora L
PéREZ-CORTéZ,Silvia; TILLETT,Stephen; ESCALA,Marcia;
Acta Botánica Venezuelica , 2002,
Abstract: the seed morphology of 51 species of passiflora was studied in order to search characteristics that would allow recognition and separation of individual species. it was possible to distinguish and separate 48 of the 51 species. an overview of the seed morphology from 51 species of passiflora and an artificial key are presented
Anatomía de la cubierta seminal en ocho especies de Passiflora L., subgénero Passiflora
PéREZ-CORTéZ,Silvia; ESCALA,Marcia; TILLETT,Stephen;
Acta Botánica Venezuelica , 2005,
Abstract: the seed coat anatomy of eight species of genus passiflora l. was studied in order to search for characteristics that would allow species distinction and resolve taxonomic problems. eight anatomical patterns were found based on the seed coat thickness, number of coats, coat type and radial extension type of the cells. one layer of macrosclereid and one layer obliterated cells were observed in all the species studied.
Resistance to Starvation of Triatoma rubrofasciata (De Geer, 1773) under Laboratory Conditions (Hemiptera: Reduviidae: Triatominae)
Rojas Cortéz, Mirko G;Gon?alves, Teresa Cristina M;
Memórias do Instituto Oswaldo Cruz , 1998, DOI: 10.1590/S0074-02761998000400024
Abstract: the present work aims at learning the period of resistance to starvation (molting/death) of triatoma rubrofasciata in different stages of development and the respective loss of weight until death. eggs of specimens from the greater area of the city of s?o luis in the state of maranh?o, brazil, yielded approximately 300 nymphs. these nymphs were placed in labelled borrel glasses, in which they were weekly fed on rats (rattus norvegicus), until reaching the stage to be observed. the experiments were conducted in a climatic chamber regulated at 29 ± 1° c, 70% relative humidity and 12 hr photoperiod. the resistance to starvation increased according to the stage of development, except for adult bugs, whose results were similar to the 3rd stage nymphs. in all these development stages there was an abrupt loss of weight in the first week, followed by a gradual loss until death. comparing this work with those of other authors, it was observed that t. rubrofasciata is among the less resistant triatomine species.
Asociación Entre la Concentración Sérica de Testosterona y la Actividad de la Enzima Glutatión Peroxidasa en Testículos de Ratones de Diferentes Edades
Matheus-Cortéz,Nyurky; López-Ortega,Aura;
Revista Científica , 2008,
Abstract: evidences exist that during the testosterone synthesis there is production of free radicals, which could increase the testicular antioxidant answer to avoid the cellular oxidative damage. the aim of this investigation was to determine if exists association between the seric concentration of free testosterone (tl) and the testicular activity of the enzyme glutatión peroxidasa (gpx) in mice of different ages. 40 male mice of stock nmri coming from the central bioterio of the universidad centroccidental ?lisandro alvarado? selected themselves, and they were divided in 5 groups of 8 animals, according to the age in days (d). group (1): 21d, (2): 28d, (3): 35d, (4): 42d and (5): 49d. under light eterización they were sacrificed, the blood was collected and in the serum the concentration of tl by electrochemiluminescence was determined. the testicles were dissected, weighed and they were placed to 4°c in in a solution buffer 50 mm tris-hcl and 5 mm edta to ph 7.6 to obtain homogenate in which one the activity of the gpx and the protein concentration was determined. to the results expressed in mu/ml and mu/mg proteins, were applied to a test of multiple comparisons (dms) and pearson?s correlation. the concentration of tl as the catalytic activity and specific of the gpx they were increased with the age (p<0.01). the increase of both variables was correlated in positive form (r=0.47) and this association was statistically significant (p<0.05) to the 21 days (prepuber stage) and 49 days (postpuber stage).
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