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Search Results: 1 - 10 of 323645 matches for " John J. CARO "
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Implementing Some Simple Strategies to Enhance Learners’ Listening Skills
John J. CARO
Revista Romaneasca pentru Educatie Multidimensionala , 2013,
Abstract: This action research was carried out with an intermediate EFL class of 37 students (19 women and 18 men) at a prestigious public university of a major city in Ecuador. After I gave them the first quiz, I noticed that most of the class performed very poorly on the listening part. I decided to find out what the problem was and what I could do to help my students to improve their listening skills. When I asked the class why they thought they did badly on the listening they came up with different reasons: “The conversations were too difficult; they were confusing; people spoke too quickly; some of the vocabulary words in the conversations were new to us”. None of my students were aware of their lack of effective listening strategies. I told my learners I would give them some listening strategies that might help them improve their listening skills. I saw this problem like an opportunity to carry out an action research project to help my students to enhance their listening skills through the implementation of some simple listening strategies such as listening for gist (the main idea); listening for specific information (details); and avoiding being distracted by certain information that was mentioned in the conversations, but that did not pertain to the people or situation stated in the question. The students took 5 more quizzes after the first one and according to the results, their scores on the listening section improved significantly.
Desempe o productivo del yaque (Leiarius marmoratus Gill, 1870) bajo diferentes densidades de siembra en estanques en tierra Desempenho produtivo do yaque (Leiarius marmoratus Gill, 1870) sob diferentes densidades de cultivo em viveiros de terra Productive performance of yaque (Leiarius marmoratus Gill, 1870) under different stocking densities in ground ponds
Nubia E Cruz-Casallas,Lili J Marciales-Caro,John J Díaz-Olarte,Ricardo Murillo-Pacheco
Revista Colombiana de Ciencias Pecuarias , 2010,
Abstract: La producción comercial de especies pertenecientes a la familia de los silúridos o bagres es una alternativa que empieza a ser considerada en muchos países, generando gran interés especies como el yaque (Leiarius marmoratus), debido a su buen desempe o en cultivo y fácil adaptación a consumo de dieta seca. En consecuencia, el presente trabajo evaluó el desempe o productivo del yaque bajo diferentes densidades de siembra, a partir de alevinos previamente acondicionados a consumo de concentrado comercial, durante un periodo productivo de cinco meses en estanques en tierra. Fueron utilizados 591 peces de tres meses de edad, con un peso promedio inicial de 20.4 ± 2.4 g y una talla inicial de 12.2 ± 2.4 cm, distribuidos en 3 densidades de siembra (0.5, 1 y 2 peces/m2) y alimentados 3 veces al día con concentrado comercial de 30% PB. Se obtuvieron resultados favorables para la densidad de siembra de 1 pez/m2, con los valores más altos en cuanto a ganancia de peso (549±42.8 g), ganancia de talla (28.1 ± 0.8 cm), ganancia diaria de peso (3.01±0.23 g/día), tasa de crecimiento específico (2.14 ± 0.07%) y factor de crecimiento relativo (14.4 ± 2.95). De acuerdo con los resultados, se puede concluir que la densidad de 1 pez/m2 es la más adecuada para el cultivo comercial de Leiarius marmoratus, bajo las condiciones experimentales descritas. A produ o comercial de espécies de peixes pertencentes à família dos silurídeos o bagres é uma alternativa que come a a considerar-se em muitos países, tendo grande interesse em espécies como o Yaque (Leiarius marmoratus), devido ao seu bom desempenho no cultivo e fácil adapta o ao consumo de ra es secas. Por tanto, o presente trabalho avaliou o desempenho produtivo do Yaque sob diferentes densidades de cultivo, a partir de alevines acostumados previamente ao consumo de ra o artificial, durante um período de cultivo de cinco meses em viveiros em terra. Foram utilizados 591 peixes de três meses de idade, com peso corporal médio de 20.4 ± 2.4 g e cumprimento inicial de 12.2 ± 2.4 cm, distribuídos ao acaso em 3 densidades de alojamento (0.5, 1 y 2 peixes/m2) e alimentados 3 vezes ao dia com ra o comercial de 30% de PB. Foram obtidos resultados favoráveis pra a densidade de 1 peixe/m2 apresentando os valores más altos em quanto o ganho de peso (549 ± 42.8 g), ganho em cumprimento (28.1 ± 0.8 cm), ganho diário de peso corporal (3.01 ± 0.23 g/día), taxa de crescimento específico (2.14 ± 0.07%) e fator de crescimento relativo (14.4 ± 2.95). De acordo com os resultados, pode-se concluir que a densidade de 1 peixe/m2 é a más adequada
Face-to-face: Changing future teachers through direct service learning
Ron Caro,John Quinn
Partnerships : A Journal of Service-Learning and Civic Engagement , 2012, DOI: 10.7253/partj.v0i0.437
Abstract: This qualitative research study analyzed the changes in social dispositions of pre-service teachers. These pre-service teachers tutored homeless children in an urban homeless shelter as part of a direct service learning project. Utilizing surveys at the beginning of the study and at the end, and reflective journals of participants, data was analyzed according to changes in the following dispositions: understanding students with social needs, anticipated changes in future teaching dispositions, and anticipated changes in pedagogical approaches. Findings support the need for imbedding direct service learning into teacher preparation programs. KEYWORDS teacher preparation, social dispositions, service-learning, community-based research, civic engagement, community engagement, community partnerships
Sobre la autoría en el delito de infracción de deber
José Antonio Caro John
Derecho Penal y Criminología , 2006,
Abstract:
Comparación del Desarrollo Embrionario de Piaractus brachypomus (Serrasalmidae) y Pseudoplatystoma sp. (Pimelodidae)
Díaz Olarte,John; Marciales-Caro,Lili J; Cristancho Vásquez,Freddy; Cruz-Casallas,Pablo E;
International Journal of Morphology , 2010, DOI: 10.4067/S0717-95022010000400033
Abstract: pseudoplatystoma sp. and piaractus brachypomus are two species of freshwater fishes endemic to south america as a high commercial crop species. the aim of this study was to compare the embryonic development of these two species until they hatch. to observe embryonic development fertilized oocytes were incubated obtained by hormonal induction in upwelling incubators woynarovich type under controlled conditions of water quality. the cleavages were observed for pseudoplatystoma sp. from 0:30 hours post fertilization (hpf) until 2:00 pm (hpf), whereas in p. brachypomus these occurred between 0:30 - 1:30 hpf. the stage of blastula, gastrula until the closure of blastopore pseudoplatystoma sp. was observed in sp between 2:00 to 12:00 p. hpf while in p. brachypomus between 2:00 to 8:00. the hatching in pseudoplatystoma sp was observed between 14:00 to 18:00 hpf, whereas p. brachypomus was faster, was observed from 12:00 until 14:00 hpf hpf, and was more homogeneous than pseudoplatystoma sp.
Adaptation to a commercial diet alters post-larvae growth and development of striped catfish (Pseudoplatystoma sp) and yaque (Leiarius marmoratus)
Marciales-Caro,Lili J; Cruz-Casallas,Nubia E; Díaz-Olarte,John J; Medina-Robles,Víctor M; Cruz-Casallas,Pablo E;
Revista Colombiana de Ciencias Pecuarias , 2011,
Abstract: the main challenges facing fish farming include the optimization of silurid fingerling production through efficient larval rearing and nursery management. this study evaluated growth performance of catfish (pseudoplatystoma sp) and yaque (leiarius marmoratus) post-larvae during adaptation to commercial diet containing 40% crude protein of animal origin (e.g., bovine liver and heart). a total of 240 l. marmoratus and pseudoplatystoma sp. post-larvae were selected at 16 days of age. postlarvae average weight and lengh were 57.2 ± 4.8 mg and 17.1 ± 1.4 mm for l. marmoratus, and 55.9 ± 6.6 mg and 13.5 ± 2.7 mm for pseudoplatystoma sp, respectively. housing density was 4 larvae / l. four treatments (t) were evaluated, with five replicates each, as follows: t1: commercial feed (c), t2:c + bovine heart (co), t3: c + liver (hi), and t4: c + liver + fish oil (hi + ap). the best weight gain for larvae of l. marmoratus was observed in t4 (3213 ± 278 mg). for pseudoplatystoma sp., no significant differences were observed between treatments, although t2 was numerically better (695 ± 149 mg). in conclusion, conditioning to a dry diet was more effective for l. marmoratus post-larvae compared to pseudoplatystoma sp. this is mainly due to the attractiveness and digestibility of the feed, as well as certain post-larvae characteristics (e.g., development of the digestive tract). it is necessary to conduct specific studies related to the ontogenetic development of the digestive tract to uncover the nutritional needs of each species during growth to match allowances with specific dietary requirements.
Evaluación del crecimiento y sobrevivencia de larvas de bagre rayado Pseudoplatystoma fasciatum (Linneaus, 1766) alimentadas con alimento vivo natural y enriquecido con ácidos grasos
Marciales-Caro,Lili J; Díaz-Olarte,John J; Medina- Robles,Víctor M; Cruz-Casallas,Pablo E;
Revista Colombiana de Ciencias Pecuarias , 2010,
Abstract: the larval stages of catfish require an adequate provision of feed to meet its nutritional requirements. native zooplankton enriched with fatty acids has been used as live feed to achieve this objective. however, this feed should be evaluated for each particular species. therefore, this study evaluated growth and survival of bagre rayado (pseudoplatystoma fasciatum) larvae fed live feed enriched with fatty acids. bagre rayado larvae were obtained by artificial reproduction. larvae were fed four times per day during 15 days. live feed consisted of artemia nauplii and native zooplankton (diaphanosoma sp. and moina sp.) non-enriched or enriched with a mixture containing 20% canola oil emulsion, 7% soya lecithin, and 73% distilled water. dietary treatments were: t1 (non-enriched artemia), t2 (enriched artemia), t3 (non-enriched cladocerans), and t4 (enriched cladocerans). the highest weight gain and size were observed for t1 (91.9 ± 13.6 mg and 17.3 ± 1.1 mm, respectively), while the lowest were for t4 (20.3 ± 2.5 mg and 9.9 ± 0.5 mm, respectively). nevertheless, the highest survival rates were observed for larvae fed enriched and non-enriched cladocerans (58.8 ± 3.2 and 63.1 ± 6.4%, respectively) in comparison with artemia and enriched artemia (42.1 ± 9.3 and 49.8 ± 5.2%, respectively). in conclusion, native zooplankton increased larval survival, although growth rates were lower than those obtained with artemia.
Crecimiento y sobrevivencia de post-larvas de bagre rayado (Pseudoplatystoma sp) y yaque (Leiarius marmoratus) consumiendo una dieta seca Crescimento e sobrevivência de pós-larvas do pintado (Pseudoplatystoma sp) e yaque (Leiarius marmoratus) alimentadas com ra o seca Adaptation to a commercial diet alters post-larvae growth and development of striped catfish (Pseudoplatystoma sp) and yaque (Leiarius marmoratus)
Lili J Marciales-Caro,Nubia E Cruz-Casallas,John J Díaz-Olarte,Víctor M Medina-Robles
Revista Colombiana de Ciencias Pecuarias , 2011,
Abstract: El principal desafío de la piscicultura con silúridos consiste en optimizar la producción de alevinos mediante prácticas eficientes de larvicultura y alevinaje. El presente estudio evaluó el desempe o productivo de post-larvas de bagre rayado (Pseudoplatystoma sp) y de yaque (Leiarius marmoratus) durante su acostumbramiento a una dieta comercial del 40% de proteína bruta de origen animal (ej: hígado y corazón de bovino). Fueron seleccionadas 240 post-larvas de L. marmoratus y de Pseudoplatystoma sp de 16 días de edad, con peso y talla promedio de 57.2 ± 4.8 mg y 17.1 ± 1.4 mm para L. marmoratus, y de 55.9 ± 6.6 mg y 13.5 ± 2.7 mm para Pseudoplatystoma sp, respectivamente. La densidad de alojamiento fue de 4 larvas/L. Fueron evaluados 4 tratamientos (T) con cinco réplicas cada uno, así: T1: alimento balanceado comercial (C); T2: C + corazón de bovino (CO); T3: C + hígado (HI) y; T4: C + hígado + aceite de pescado (HI+AP). La mejor ganancia de peso para larvas de L. marmoratus se observó en el T4 (3213 ± 278 mg). Para Pseudoplatystoma sp no se observaron diferencias significativas entre tratamientos, aunque el mejor resultado numérico fue para el T2 (695 ± 149 mg). En conclusión, el acondicionamiento a dieta seca fue más eficiente en post-larvas de L. marmoratus que en Pseudoplatystoma sp, debido principalmente a la atractabilidad y digestibilidad del alimento, así como a características de las post-larvas (desarrollo del tracto digestivo). Se hace necesario realizar estudios específicos de desarrollo ontogénico relacionados con las características del tracto digestivo que permitan evidenciar las necesidades nutricionales de cada especie durante su crecimiento, para formular dietas acordes con los requerimientos específicos. O principal desafio da aquicultura com silúridas é optimizar a produ o de alevines mediante práticas eficientes de larvicultura e alevinagem. O presente estudo avaliou o desempenho produtivo de pós-larvas de pintado (Pseudoplatystoma sp) e Yaque (Leiarius marmoratus) durante o período de adapta o a uma dieta comercial com 40% de proteína bruta de origem animal (por exemplo, fígado e cora o de bovino). Foram seleccionados 240 pós-larvas de L. marmoratus e Pseudoplatystoma sp 16 dias de idade, peso e comprimento médio de 57.2 ± 4.8 mg e 17.1 ± 1.4 mm para L. marmoratus, e 55.9 ± 6.6 mg e 13.5 ± 2.7 mm para Pseudoplatystoma sp, respectivamente. A densidade de alojamento foi de 4 larvas/L. Foram avaliados quatro tratamentos (T), com cinco repeti es, conforme segue: T1: ra o comercial (C), T2: C + cora o (CO), T3: C + fígado (HI) e T4
Evaluación del crecimiento y sobrevivencia de larvas de bagre rayado Pseudoplatystoma fasciatum (Linneaus, 1766) alimentadas con alimento vivo natural y enriquecido con ácidos grasos Avalia o do crescimento e a sobrevivência de larvas de bagre rayado Pseudoplatystoma fasciatum (Linneaus, 1766) alimentadas com alimento vivo natural ou enriquecido com ácidos graxos Growth and survivability of bagre rayado (Pseudoplatystoma fasciatum; Linneaus, 1766) larvae fed live feed enriched with fatty acids
Lili J Marciales-Caro,John J Díaz-Olarte,Víctor M Medina- Robles,Pablo E Cruz-Casallas
Revista Colombiana de Ciencias Pecuarias , 2010,
Abstract: La producción de silúridos en etapas larvales implica un suministro adecuado de alimento, el cual debe suplir las necesidades nutricionales en cada especie. El uso de zooplancton nativo como alimento vivo y su sometimiento a procesos de enriquecimiento con ácidos grasos vegetales han permitido en parte alcanzar este objetivo, no obstante, su evaluación en cada una de las especies aún es necesaria. Por lo anterior, el objetivo del presente trabajo fue evaluar el crecimiento y sobrevivencia de larvas de bagre rayado Pseudoplatystoma fasciatum alimentadas con alimento vivo enriquecido con ácidos grasos. Para esto, fueron utilizadas larvas de 3 dpe obtenidas por reproducción artificial, las cuales fueron alimentadas 4 veces al día, durante 15 d con nauplios de Artemia y zooplancton nativo (Diaphanosoma sp. y Moina sp.) no enriquecidos y enriquecidos con una emulsión a base de 20% de Aceite de Canola, 7% de Lecitina de Soya y 73% de agua destilada, para suministrar 4 tratamientos: T1: Artemia Natural; T2: Artemia Enriquecida; T3: Cladóceros Natural; T4 Cladóceros Enriquecidos). Como resultados, el tratamiento que presentó la mayor ganancia de peso y talla fue el de larvas alimentadas con Artemia (91.9 ± 13.6 mg y 17.3 ± 1.1 mm, respectivamente), y la menor el tratamiento correspondiente a cladóceros enriquecidos con ácidos grasos (20.3 ± 2.5 mg y 9.9 ± 0.5 mm, respectivamente), sin embargo, las tasas más altas de sobrevivencia fueron observadas en los tratamientos de larvas alimentadas con cladóceros enriquecidos y no enriquecidos (58.8 ± 3.2 y 63.1 ± 6.4%, respectivamente), cuando comparadas con los tratamientos alimentados con artemia y artemia enriquecida (42.1 ± 9.3 y 49.8 ± 5.2%, respectivamente). En conclusión se observó que los procedimientos de enriquecimiento de zooplancton nativo aumentan la sobrevivencia larval en la especie, aun cuando las tasas de crecimiento son menores a las obtenidas con Artemia. Para a produ o de silurídeos, durante a fase larval é necessario o fornecimento de alimento que satisfaga as necessidades nutricionais da espécie. O uso de zooplancton nativo natural ou submetido a enriquecimento com ácidos graxos de origem vegetal tem permitido, em parte, atingir esse objetivo; No entanto, sua avalia o em cada uma das espécies é mesmo necessária. Por tanto, o objetivo deste trabalho foi avaliar o crescimento e a sobrevivência de larvas do Bagre Rayado (Pseudoplatystoma fasciatum) alimentadas com zooplancton vivo, enriquecido ou n o com ácidos graxos. Para tal propósito, foram utilizadas larvas de 3 dias de idade, obtidas mediante r
Impediments to mixing classical and quantum dynamics
J. Caro,L. L. Salcedo
Physics , 1998, DOI: 10.1103/PhysRevA.60.842
Abstract: The dynamics of systems composed of a classical sector plus a quantum sector is studied. We show that, even in the simplest cases, (i) the existence of a consistent canonical description for such mixed systems is incompatible with very basic requirements related to the time evolution of the two sectors when they are decoupled. (ii) The classical sector cannot inherit quantum fluctuations from the quantum sector. And, (iii) a coupling among the two sectors is incompatible with the requirement of physical positivity of the theory, i.e., there would be positive observables with a non positive expectation value.
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