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Search Results: 1 - 10 of 32979 matches for " Daniel Gagnon "
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Developmental Process of Dialogical Critical Thinking in Groups of Pupils Aged 4 to 12 Years  [PDF]
Marie-France Daniel, Mathieu Gagnon
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.25061
Abstract: The objective of this study is to model the development of critical thinking in groups of pupils aged 4 to 12 years. A previous study, conducted with groups of pupils aged 9 to 12 years who practiced Philosophy for Children (P4C), proposed a model that shows how critical thinking develops in these age groups. The present empirical study was conducted in three geographical contexts (Quebec, Ontario and France) with 17 classrooms of pupils who had practiced P4C. Based on a qualitative method of analysis that stems from the Grounded Theory, analysis of the 17 transcripts of exchanges resulted in a revised model of the developmental process of critical thinking that is defined by four thinking modes and six epistemological perspectives. Using this revised model, a further analysis of the transcripts illustrated that the development of critical thinking occurred through a process of fading and appropriation/transformation, which is associated with “scaffolding”.
Soil Agricultural Potential in Four Common Andean Land Use Types in the Highlands of Southern Ecuador as Revealed by a Corn Bioassay  [PDF]
Gustavo Chacón, Daniel Gagnon, David Paré
Agricultural Sciences (AS) , 2015, DOI: 10.4236/as.2015.610108
Abstract: In the Andes, little is known about the relationships among current land uses and their effect on soil fertility. Corn (Zea mays L.) was used to evaluate soil quality for plant growth on soils of four land uses, along an expected gradient of fertility: native forests (Nf) > pastures (Pa) > Eucalyptus globulus Labill. plantations (Eg) > Pinus patula Schlecht. plantations (Pp). Corn was grown in soils taken from four different areas, for the four land uses in each. In a common garden, a randomized block design was used with four treatments: controls (C), ammonium nitrate (N), triple superphosphate (P), and combined N and P fertilizers (N + P). On soils from Nf, Pa and Eg, fertilization response was N + P > P > N > C; corn biomass (g/pot-1) averaged 4.5 in N + P, 3.3 in P, 1.8 in N, 1.7 in C; P content (mg/pot-1) averaged 12 in N + P, 11.9 in P, 2.3 in N, 2 in C. N + P enhanced growth the most. Mortality was high on Pp soils, growth weak, and fertilization response was P > N + P > C ≥ N; corn biomass (g/pot-1) was 0.9 in P, 0.5 in N + P, 0.8 in C, 0.4 in N; P content (mg/pot-1) was 4.4 in P, 2.3 in N + P, 1.8 in C, 1 in N. All soils had P, K, Ca and Mg deficiencies. Al toxicity possibly occurred only in Pp soils. All control soils had low fertility. Responses to N and P were high except for Pp. Pastures and plantations were once natural forests converted to agriculture, then to pastures as soil fertility declined. Plantations were likely established on poorest pastures; only pine grew on poorest soils. This land use endpoint has the lowest agricultural potential; other land uses have limitations in P, N, and potentially K.
Clone-Specific Response in Leaf Nitrate Reductase Activity among Unrelated Hybrid Poplars in relation to Soil Nitrate Availability
Julien Fortier,Benoit Truax,France Lambert,Daniel Gagnon
International Journal of Forestry Research , 2012, DOI: 10.1155/2012/103878
Abstract:
Mature Hybrid Poplar Riparian Buffers along Farm Streams Produce High Yields in Response to Soil Fertility Assessed Using Three Methods
Julien Fortier,Benoit Truax,Daniel Gagnon,France Lambert
Sustainability , 2013, DOI: 10.3390/su5051893
Abstract: This study had three main objectives: (1) to evaluate the aboveground biomass and volume yield of three unrelated hybrid poplar clones in 9 year-old riparian buffer strips located on four farms of southern Québec, Canada; (2) to compare yield data at 9 years with previous data (at 6 years); (3) to evaluate how soil fertility, measured using three different soil testing methods (soil nutrient stocks, soil nutrient concentrations, soil nutrient supply rates), is related to yield. Across the four sites, hybrid poplar productivity after 9 years ranged from 116 to 450 m 3ha ?1, for stem wood volume, and from 51 to 193 megagrams per hectare (Mg ha ?1), for woody dry biomass. High volume and woody dry biomass yields (26.3 to 49.9 m 3ha ?1yr -1, and 11.4 to 21.4 Mg ha ?1yr -1) were observed at the three most productive sites. From year 6 to 9, relatively high yield increases (8.9?15.1 m 3ha ?1yr ?1) were observed at all sites, but the productivity gap between the less fertile site and the three other sites was widened. Clone MxB-915311 was the most productive across the four sites, while clone DxN-3570 was the least productive. However, at the most productive site, clone MxB-915311 experienced severe stem and branch breakages. Independently of the soil testing method used, available soil P was always the first soil factor explaining volume yield.
A New Tool to Explore Children’s Social Competencies: The Preschool Competition Questionnaire
Daniel Paquette,Marie-No?lle Gagnon,Luc Bouchard,Marc Bigras
Child Development Research , 2013, DOI: 10.1155/2013/390256
Abstract:
Clone-Specific Response in Leaf Nitrate Reductase Activity among Unrelated Hybrid Poplars in relation to Soil Nitrate Availability
Julien Fortier,Benoit Truax,France Lambert,Daniel Gagnon,Normand Chevrier
International Journal of Forestry Research , 2012, DOI: 10.1155/2012/103878
Abstract: In this field study, we used in vivo NRA activity in hybrid poplar leaves as an indicator of assimilation for five unrelated hybrid poplar clones. We also examined if leaf NRA of these clones is influenced to the same extent by different levels of soil availability in two riparian agroforestry systems located in pastures. Leaf NRA differences of more than one order of magnitude were observed between the clones, clearly showing their different abilities to reduce in leaves. Clone DxN-3570, a P. deltoides x P. nigra hybrid (Aigeiros intrasectional hybrid), always had the highest leaf NRA during the field assays. This clone was also the only one to increase its leaf NRA with increasing soil availability, which resulted in a significant Site x Clone interaction and a positive relationship between soil concentration and NRA. All of the four other clones studied had one or both parental species from the Tacamahaca section. They had relatively low leaf NRA and they did not increase their leaf NRA when grown on the rich site. These results provide evidence that assimilation in leaves varies widely among hybrid poplars of different parentages, suggesting potential preferences for N forms. 1. Introduction Poplars (Populus spp.) are commonly planted for production and restoration purposes in different plantation systems, environments (agricultural land, abandoned farmland, clearcut forest, contaminated sites, riparian buffers, intercropping systems, etc.), and climates [1–7]. A large number of poplar hybrids exist throughout the world and they exhibit wide variations in functional traits (i.e., morphological, physiological, and phenological characteristics) [8, 9]. Because they can be clonally propagated with ease, poplars from the Tacamahaca and the Aigeiros sections and their hybrids form the basis of most poplar breeding programs worldwide [10]. Although they are all pioneer species that mainly occur in coastal, riparian, alluvial, and bottomland environments, poplars from these two sections differ widely in their natural distributions, as they are adapted to different soil and climatic conditions [11]. Poplars from the Tacamahaca section are mostly associated with riparian or wetland habitats [11]. They are widely distributed in the northern latitudes, with some species growing to the latitudinal or altitudinal limits of trees [11]. Poplars from the Aigeiros section are better adapted to riparian soils in the bottomlands of temperate and arid regions [11, 12]. Poplars from the Tacamahaca and the Aigeiros sections also show marked differences in their N-form
Health 3.0—The patient-clinician “arabic spring” in healthcare  [PDF]
Serge Gagnon, Laurent Chartier
Health (Health) , 2012, DOI: 10.4236/health.2012.42008
Abstract: A growing number of citizen-patients and clinicians use Communication and Self-Managed Health Technologies (CSMHT) in their relationship. Doing so, they shift from the current paradigm of dependency to a co-responsibility paradigm in healthcare. Facing the runaway utilization of health services, we need to think “outside the box” to unblock the system. A Health 3.0 development model of governance that position patients as primary members of the clinicians’ team is presented to map this institutional transformation. At the practical level, an MD 3.0 relational model and a Citizen-Patient 3.0 behavioral profile are presented.
Detection of Fetomaternal Genotype Associations in Early-Onset Disorders: Evaluation of Different Methods and Their Application to Childhood Leukemia
Jasmine Healy,Mathieu Bourgey,Chantal Richer,Daniel Sinnett,Marie-Helene Roy-Gagnon
Journal of Biomedicine and Biotechnology , 2010, DOI: 10.1155/2010/369534
Abstract: Several designs and analytical approaches have been proposed to dissect offspring from maternal genetic contributions to early-onset diseases. However, lack of parental controls halts the direct verification of the assumption of mating symmetry (MS) required to assess maternally-mediated effects. In this study, we used simulations to investigate the performance of existing methods under mating asymmetry (MA) when parents of controls are missing. Our results show that the log-linear, likelihood-based framework using a case-triad/case-control hybrid design provides valid tests for maternal genetic effects even under MA. Using this approach, we examined fetomaternal associations between 29 SNPs in 12 cell-cycle genes and childhood pre-B acute lymphoblastic leukemia (ALL). We identified putative fetomaternal effects at loci CDKN2A rs36228834 (=.017) and CDKN2B rs36229158 (=.022) that modulate the risk of childhood ALL. These data further corroborate the importance of the mother's genotype on the susceptibility to early-onset diseases.
Phylogeny, ecological fitting and lung flukes: helping solve the problem of emerging infectious diseases
Brooks, Daniel R.;McLennan, Deborah A.;León-Règagnon, Virginia;Hoberg, Eric;
Revista mexicana de biodiversidad , 2006,
Abstract: traditional wisdom, based on assumptions of species-specific coevolutionary interactions between hosts and parasites, suggests that pathogens with multi-host life cycles are unlikely to move with their definitive hosts because their transmission requirements are so specialized. ecological fitting provides a theory of diffuse coevolution, which allows introduced pathogens with complex life cycles to become established and spread rapidly into native hosts if the resource required at each stage of the life cycle is both phylogenetically conservative (distributed among numerous species) and geographically widespread. the external appearance of life cycle complexity does not, therefore, on its own, predict the potential for an organism to become an emerging infectious disease. we apply this concept to explain a potential enigma, the presence of a lung fluke, haematoloechus floedae, endemic to north american bullfrogs, in costa rican leopard frogs, even though there are no bullfrogs extant in the country today, and none ever occurred where the parasite has been discovered. we then discuss how the integration of ecological and life history information within a phylogenetic framework can help biologists move from attempts to manage emerging infectious disease outbreaks to the ability to predict and thus circumvent the outbreak in the first place.
Phylogeny, ecological fitting and lung flukes: helping solve the problem of emerging infectious diseases Filogenia, flexibilidad ecológica y digéneos de pulmones: ayudando a resolver la crisis de las enfermedaes infecciosas emergentes
Daniel R. Brooks,Deborah A. McLennan,Virginia León-Règagnon,Eric Hoberg
Revista mexicana de biodiversidad , 2006,
Abstract: Traditional wisdom, based on assumptions of species-specific coevolutionary interactions between hosts and parasites, suggests that pathogens with multi-host life cycles are unlikely to move with their definitive hosts because their transmission requirements are so specialized. Ecological fitting provides a theory of diffuse coevolution, which allows introduced pathogens with complex life cycles to become established and spread rapidly into native hosts if the resource required at each stage of the life cycle is both phylogenetically conservative (distributed among numerous species) and geographically widespread. The external appearance of life cycle complexity does not, therefore, on its own, predict the potential for an organism to become an emerging infectious disease. We apply this concept to explain a potential enigma, the presence of a lung fluke, Haematoloechus floedae, endemic to North American bullfrogs, in Costa Rican leopard frogs, even though there are no bullfrogs extant in the country today, and none ever occurred where the parasite has been discovered. We then discuss how the integration of ecological and life history information within a phylogenetic framework can help biologists move from attempts to manage emerging infectious disease outbreaks to the ability to predict and thus circumvent the outbreak in the first place. Con base en el supuesto de coevolución a nivel de especies de parásitos y hospederos, tradicionalmente se asume como poco probable que aquellos patógenos con ciclos de vida que involucran varios hospederos acompa en a su hospedero definitivo a un nuevo ambiente, por lo especializado de sus requerimientos de transmisión. El fenómeno de flexibilidad ecológica aporta una teoría de coevolución difusa, que permite a los patógenos con ciclos de vida complejos, que han sido introducidos, establecerse y dispersarse de una manera rápida en hospederos nativos, si el recurso requerido en cada etapa del ciclo de vida es filogenéticamente conservado (se distribuye en numerosas especies) y a la vez, tiene una distribución geográfica amplia. Por lo tanto, la complejidad de un ciclo de vida no predice, por sí misma, el potencial de un organismo para provocar una enfermedad infecciosa emergente. Aplicamos este concepto para explicar el caso particular de un digéneo del pulmón de anfibios, Haematoloechus floedae, endémico de ranas toro de Norteamérica, que fue recolectado en ranas leopardo de Costa Rica, aún cuando actualmente no existen ranas toro en ese país, y nunca existieron en la región en donde se encontró al parásito. Asimismo,
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