Contextos habituales de alimentación en edad temprana: estudio en díadas cuidador principal e hijo o hija / Usual feeding context in early childhood. Study of the caregiver-.baby dyed and the alimentary style of the main caregiver

Es importante investigar el inicio de la conducta alimentaria dadas las altas tasas de obesidad infantil a nivel mundial y en Chile. Diversas investigaciones dan importancia al rol que cumplen los padres en la formacion de hábitos alimentarios durante la primera infancia. Este trabajo pretende relacionar las características del contexto alimentario cotidiano en infancia temprana con la emocionalidad de la díada cuidador-bebé, y estilo alimentario del cuidador principal. Estudio descriptivo, correlacional y transversal. Observación por jueces expertos de 29 videograbaciones de díadas cuadador-bebé en una práctica alimentaria habitual. La media de edad de los/las niños/as fue de 2,12 años (DS= 0,48), la mayoría presentan un estado nutricional normal (51,7%), y el 62% eran varones. Cuestionarios aplicados: encuesta sociodemográfica, lista de chequeo de conductas alimentarias habituales, medición de estado socioemocional del niño (CBCL y ASQ-SE), sintomatología afectiva y alimentaria del cuidador principal (DASS 21 y DEBQ ). Las conductas alimentarias problemáticas más frecuentes de los niños son: rechazar comer alimentos específicos por textura/sabor y un estado emocional tenso durante la alimentación. Los síntomas depresivos y de estrés del cuidador se asociaron significativamente con el comportamiento del menor durante la práctica alimentaria cotidiana. Se observa una relación significativa entre la percepción de los estados emocionales del niño por parte de su cuidador, un contexto no habitual para realizar la práctica alimentaria y la actitud más directiva que asume el adulto durante la interacción alimentaria. Es necesario investigar la interacción alimentaria especialmente durante los primeros años de vida, momento en que se establecen los hábitos alimentarios.

It is important to investigate the beginning of eating behavior given the high rates of child obesity that exist all around the world and in Chile. A large number of investigations give importance to the role of parents in the formation of eating habits during early childhood. This work aims to relate the characteristics of the usual feeding context in early childhood with the emotionality of the caregiverbaby dyad, and the alimentary style of the main caregiver. Descriptive, correlational and transversal study. Observation by expert judges of 29 video recordings of caregiver-baby dyad in a habitual feeding practice. The average age of the children was 2.12 years (DS = 0.48), most of them had normal nutritional status (51.7%), and 62% were males. Applied questionnaires: socio-demographic survey, checklist of habitual eating behaviors, measurement of the child's socio-emotional state (CBCL Y ASQ-SE), affective and alimentary symptomatology of the main caregiver (DASS 21 Y DEBQ ). The most frequent problematic eating behaviors of children are: Reject to eat specific foods due to texture/flavour and a tense emotional state during the feeding. The depressive and stress symptoms of the caregiver are significantly associated with the behavior of the child during the habitual feeding practice. It is noted a significant relationship between the caregiver's perception of the child's emotional state, an unusual context to perform feeding practice and the more directive attitude assumed by the adult during the alimentary interaction. It is necessary to investigate the food interaction especially during the first years of life, when eating habits are established.

Intensification of crop rotation affecting weed communities and the use of herbicides in the rolling Pampa.

Weeds are one of the main problems in the cropping systems of the Rolling Pampa (Argentina), where glyphosate resistant varieties of soybean sown with no-tillage system became the most important crop in the rotation. The challenge to solve this problem is to apply alternative approaches that both reduce weediness and the use of chemicals. Thus, the objectives of this work were i) to study the impact of crop rotation intensification on the species composition and richness of weed communities and to identify the relationship with some environmental (soil mineral organic matter) and agronomic variables (intensification, cereal crops in the rotation, biomass production and herbicide applications) and ii) to quantify the use and environmental risk of herbicides related to the intensification of crop rotations. From 2012 to 2019, four rotations were performed on three farms combining crops (soybean, maize, wheat and field pea), cover crops (oats and hairy vetch) and mixed pastures. During spring 2018 and autumn 2019 field and seedbank experiments were performed. PCA using presence-absence of species as response variable and intensification index of rotation (IIR), proportion of cereal crops in the rotation (C), biomass production (B), mineral organic matter (OM) and number of herbicide applications (HA) during the six years of the rotation as explanatory variables. The use and environmental risk of herbicides was also assessed. Surveys and seedbank analysis showed that intensification of crop rotations resulted in differences in the floristic composition of weed communities mainly related to IIR and C. Although the use of herbicides decreased as intensification grew, species richness and abundance did not change. Despite of all the variations considered in this study such as different approaches (emerged weeds and seedbank), locations, crops, pastures and sowing dates, intensification consistently filtered species conforming different weed assemblies and reducing the use of herbicides. Thus, promoting sustainable intensification by increasing cover crops, winter crops, cereal crops and pastures in the rotations would be a useful tool to manage weeds since the use of herbicides can be replaced by increasing the IIR without variations in weed abundance.

Vivir sin gluten: percepción sobre alimentación, calidad de vida y socialización en adultos celiacos / GLUTEN-FREE LIFE: FOOD PERCEPTION- QUALITY OF LIFE AND SOCIALIZATION IN CELIAC ADULTS

La enfermedad celiaca es la intolerancia alimentaria más común del mundo, alcanzando a un 1% de la población y su único tratamiento es una dieta libre de gluten. El objetivo del estudio, de tipo exploratorio y diseño descriptivo, es conocer la percepción que los adultos celiacos tienen sobre su alimentación, calidad de vida y socialización después de empezar el tratamiento. Se entrevistó a 8 celiacos entre 24 y 37 años. Los entrevistados describen una respuesta emocional ante su nueva alimentación, que abarca frustración, cansancio, alivio, tranquilidad, no siendo excluyentes entre sí. El tratamiento nutricional hace ganar habilidades como la cocina, lo que genera mayor consciencia sobre lo que se come. Extrañar la comida con gluten es transversal; hay quienes pueden manejarlo, otros quienes rompen el tratamiento. La calidad de vida se ve afectada por el mayor costo económico de alimentacion sin gluten, las enfermedades asociadas y los factores que facilitan la adherencia a la dieta. La socialización con el entorno es facilitada cuando al celiaco se le apoya en su tratamiento; el ocio se vuelve más escaso y difícil, llevando a la restricción social

Celiac disease is the most common food intolerance in the world, reaching a prealenve of 1% of the population and its only treatment is a gluten-free diet. The aim of the study, exploratory and descriptive design, is to know the perception that celiac adults have about their diet, quality of life and socialization after starting treatment. Eight celiacs between the ages of 24 and 37 were interviewed. The interviewees describe an emotional response to their new diet, encompassing frustration, tiredness, relief and calm. Nutritional treatment makes them gain skills like cooking, which raises awareness about what you eat. Missing gluten-food is cross-cutting, some can handle it, others break treatment. Quality of life is affected by the higher economic cost of gluten-free nutrition, associated diseases and factors that facilitate diet adherence. Socialization with the environment is facilitated when celiac people is supported in its treatment; leisure becomes scarcer and more difficult, leading to social restrictions

Identification of the genotype from the content and composition of the essential oil of lemon verbena (Aloysia citriodora Palau).

Aloysia citriodora accessions from cultivated material, botanical collections, and wild populations were studied by means of their biomass and essential oil production and composition to assist the selection of the most promising genotype. The study was carried out through both field experiments during two year's time and laboratory processes. Data were evaluated by means of univariate and multivariate techniques. Aloysia citriodora intraspecific variation was accounted for by differences in both yield and chemical profiles of the essential oils, but no differences were found in the biomass production. Three chemotypes were identified according to qualitative and quantitative differences of the essential oils. For the higher contents of neral and geranial, Mendoza accession was the most promising to be encouraged for future crops.

Coriander essential oil composition from two genotypes grown in different environmental conditions.

The objective was to study the essential oil composition of coriander fruits in plants growing in environments differing in soil conditions and weediness level. Factorial field experiments were conducted in two locations from the Rolling Pampas, Argentina, and two coriander landraces (European and Argentinean) were tested under two levels of nitrogen fertilization and weediness. Data were evaluated with uni- and multivariate techniques. The variation in the oil composition was related to the relative proportion of the constituents and not to the presence/absence of a particular component. Weather conditions in 1997 favored linalool and camphor in both landraces. Location, fertilization, and weediness also affected the chemical profile. The European landrace showed a more stable concentration of the major components than the Argentinean landrace. These results, which show the relationships between some environmental conditions and the essential oil composition, are useful in the development of innovative strategies aimed to improve oil composition and to manage crop pests.