61 research outputs found
Patrón de desarrollo ovárico en hembras de Triatoma sordida ayunadas
Entre los vectores secundarios de Trypanosoma cruzi - agente causante de enfermedad de chagas - Triatoma sordida es considerada una especie de importancia epidemiológica debido a su presencia en peridomicilios y a la tendencia a invadir y formar grandes colonias domésticas.Fil: Rodríguez, C. Universidad Nacional de Córdoba Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Biológicas y Tecnológicas. Cátedra Introducción a la Biología; Argentina.Fil: Rodríguez, C. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Aguirre, S. Universidad Nacional de Córdoba. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Bioquímica Clínica e Inmunología. Departamento de Bioquímica Clínica; Argentina.Fil: Aguirre, S. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas; Argentina.Fil: Nattero, J. Universidad Nacional de Córdoba Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Biológicas y Tecnológicas. Cátedra .Introducción a la Biología; Argentina.Fil: Nattero, J. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Fil: Canavoso, L. Universidad Nacional de Córdoba. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Bioquímica Clínica e Inmunología. Departamento de Bioquímica Clínica; Argentina.Fil: Canavoso, L. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas; Argentina.Fil: Crocco, L. Universidad Nacional de Córdoba Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Biológicas y Tecnológicas. Cátedra .Introducción a la Biología; Argentina.Fil: Crocco, L. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.Zoología, Ornitología, Entomología, Etologí
Transgressive phenotypes and generalist pollination in the floral evolution of Nicotiana polyploids
This is the author's proofThe file attached is the Accepted/final draft post-refereeing version of the article. 6 month embargo now lapsed
ViDa1: The Development and Validation of a New Questionnaire for Measuring Health-Related Quality of Life in Patients with Type 1 Diabetes
IGTPAltres ajuts: Funding was provided by the Canarian Agency for Research,Innovation and Information Society (ACIISI) (DA predoctoralfellowship TESIS20120050) and the V Guido Ruffino Grantfor Research in Therapeutic Education for Diabetes (SpanishDiabetes Society 2015)This study describes the development of a new questionnaire to measure health-related quality of life (HRQoL) in patients with type 1 diabetes (the ViDa1 questionnaire) and provides information on its psychometric properties. For its development, open interviews with patients took place and topics relevant to patients' HRQoL were identified and items were generated. Qualitative analysis of items, expert review, and refinement of the questionnaire followed. A pilot study (N = 150) was conducted to explore the underlying structure of the 40-item ViDa1 questionnaire. A Principal Component Analysis (PCA) was performed and six of the items that did not load on any of the factors were eliminated. The results supported a four-dimensional structure for ViDa1, the dimensions being Interference of diabetes in everyday life, Self-care, Well-being, and Worry about the disease. Subsequently, the PCA was repeated in a larger sample (N = 578) with the reduced 34-item version of the questionnaire, and a Confirmatory Factor Analysis (CFA) was performed (N = 428). Overall fit indices obtained presented adequate values which supported the four-factor model initially proposed [(2(df =554) = 2601.93) (p < 0.001); Root Mean Square Error of Approximation = 0.060 (CI = 0.056 −0.064)]. As regards reliability, the four dimensions of the ViDa1 demonstrated good internal consistency, with Cronbach's alphas ranging between 0.71 and 0.86. Evidence of convergent-discriminant validity in the form of high correlations with another specific HRQoL questionnaire for diabetes and low correlations with other constructs such as self-efficacy, anxiety, and depression were presented. The ViDa1 also discriminated between different aspects of clinical interest such as type of insulin treatment, presence of chronic complications, and glycemic control, temporal stability, and sensitivity to change after an intervention. In conclusion, the ViDa1 questionnaire presents adequate psychometric properties and may represent a good alternative for the evaluation of HRQoL in type 1 diabetes
Pollinator-mediated selection in a specialized pollination system: matches and mismatches across populations
Artículo de publicación ISIMost studies on pollinator-mediated selection have been performed in
generalized rather than specialized pollination systems. This situation has
impeded evaluation of the extent to which selection acts on attraction or
specialized key floral traits involved in the plant-pollinator phenotypic
interphase. We studied pollinator-mediated selection in four populations of
Nierembergia linariifolia, a self-incompatible and oil-secreting plant pollinated
exclusively by oil-collecting bees. We evaluated whether floral traits experience
variable selection among populations and whether attraction and fit traits
are heterogeneously selected across populations. Populations differed in every
flower trait and selection was consistently observed for corolla size and flower
shape, two traits involved in the first steps of the pollination process. However,
we found no selection acting on mechanical-fit traits. The observation that
selection occurred upon attraction rather than mechanical-fit traits, suggests
that plants are not currently evolving fine-tuned morphological adaptations to
local pollinators and that phenotypic matching is not necessarily an expected
outcome in this specialized pollination system.This study was funded by
CONICET (PIP 5174), SECyT U.N.C (197 ⁄ 05) and FONCYT
(PICT 01-33755). RM was supported by ACT
34 ⁄ 2006 during the writing of this article
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