9,869 research outputs found
Patrones de actividad y abundancias estacionales del Flamenco Andino (Phoe-nicoparrus andinus) en dos humedales contrastantes en Argentina
El Flamenco Andino utilizade forma complementaria y alternativa humedales altoandinos de Argentina, Bolivia, Chile y Perú,además de humedales en las tierras bajas de Argentina. Estudios previos se enfocaron en su com-portamiento en sitios andinos, pero no existen al momento estudios de este tipo en sitios de tierrasbajas. Debido a esto, el objetivo del estudio fue analizar los patrones de actividad, de despliegues decortejo y abundancias de esta especie de flamenco en dos humedales contrastantes. Los sitios de es-tudio fueron: la Laguna de Vilama, en el noroeste de Argentina y a 4500 m s.n.m., la cual es utilizadaen el verano durante el período reproductivo; y la Laguna Melincué, en la planicie del centro-este deArgentina y a 84 m s.n.m., que es utilizada durante el período no reproductivo invernal. Entre sitios yentre años hubo marcadas diferencias en la abundancia y en los patrones de actividad. En la Lagunade Vilama, los flamencos se alimentaron durante la mayor parte del tiempo (95%), mientras que enla Laguna Melincué, los flamencos mostraron un rango más amplio de comportamientos, destinandosólo el 60% del tiempo a alimentarse. No registramos despliegues nupciales (marchas) en la Lagunade Vilama, mientras que en la Laguna Melincué sí registramos marchas, las cuales fueron másfrecuentes y de mayor duración en aquellos años con mayores abundancias de flamencos. Las dife-rencias en actividades entre los sitios estarían asociadas a la calidad y disponibilidad de recursos yal momento del ciclo reproductivo, donde los sitios de tierras bajas proveen hábitats críticos paralas actividades de cortejo que finalmente influyen el éxito reproductivo en los humedales de los AltosAndes.The Andean Flamingo (Phoenicoparrus andinus), one of three flamingo species in southernSouth America makes complementary and alternative use of high Andean wetlands in Argentina, Bolivia,Chile and Peru, and lowland wetlands in Argentina over its life cycle. Previous studies have focused onits behavior in Andean sites, but there are no such studies in lowland sites. Therefore, we analyzed theactivity patterns, courtship displays, and individual abundance of this flamingo species at two contrastingwetland sites, Laguna de Vilama, located at 4500 m a.s.l. in northwestern Argentina and used in summerduring the breeding season, and Laguna Melincué, a lowland wetland located at 84 m a.s.l. in the plainsof central east Argentina and used in winter during the non-breeding season. There were marked differ-ences in flamingo abundance and activity patterns between sites and years. In Laguna de Vilama, fla-mingos were feeding most of the time (95%), whereas at Laguna Melincué, flamingos showed a broaderrange of behaviors, with only a 60% of time spent feeding. We did not record marching displays atLaguna de Vilama, whereas at Laguna Melincué we recorded marching events in each of the three studyyears, being more frequent and lasting longer in the year with higher flamingo abundance. The differ-ences in behaviors at these sites are associated with resource quality and availability and with timing ofthe reproductive cycle, with lowland wetlands providing critical habitats for courtship displays that influ-ence reproductive success of this species breeding colonies in high Andean wetlands. Accepted 1 Octo-ber 2014Fil: Derlindati, Enrique Javier. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto Geonorte; Argentina. Grupo de Conservación Flamencos Altoandinos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Romano, Marcelo C. Grupo de Conservación Flamencos Altoandinos; Argentina. Centro de Investigaciones en Biodiversidad y Ambiente. Rosario; ArgentinaFil: Cruz, Nancy N.. Grupo de Conservación Flamencos Altoandinos; Argentina. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto Geonorte; ArgentinaFil: Barisón, Caterina. Grupo de Conservación Flamencos Altoandinos; Argentina. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Arengo, Felicity. Grupo de Conservación Flamencos Altoandinos; Argentina. American Museum Of Natural History; Estados UnidosFil: Barberis, Ignacio Martín. Grupo de Conservación Flamencos Altoandinos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
How parental autonomy support prevent from adolescents’ depression and low self-esteem: a mediational model with trait Emotional Intelligence
Objective: The main aim of this study was to deepen the literature about parental autonomy support, analysing the relation between its two dimensions, Promotion of Independence (PI) and Promotion of Volitional Functioning (PVF), and adaptive outcomes in adolescents. Specifically, it was hypothesized that both components would predict higher self-esteem and lower depression in adolescents, through the mediation of trait Emotional Intelligence (trait EI). Method: A total of 283 adolescents, aged between 14 and 17 years (M=15.53; SD=1.21), participated in this study. They completed the Center for Epidemiologic Studies- Depression Scale (CES-D), the Promotion of Independence (PI) and Promotion of Volitional Functioning (PVF), the Rosenberg Self-Esteem and Trait Emotional Intelligence Questionnaire- Adolescent Short Form (TEIQue-ASF). Results: It was found that parental autonomy support predicted trait EI, which in turn fully mediated the relation between supportive practices and psychological outcomes in adolescents, with several interesting parent gender differences. Conclusions: This study highlights how autonomy-supportive practices are fundamental for healthy and adequate development of emotional intelligence in adolescents. It also contributes to the advancement of research on the contextual and individual mechanisms underlying the functional adaptation of offspring
Aspects of a0-f0 mixing in the reaction pn->da0
Some aspects of a0-f0 mixing effects in the reaction
with perpendicular polarized proton beam are discussed. An angular--asymmetry
parameter is defined to study those effects. It is shown that, for energies
close to the production threshold, the angular--asymmetry parameter is proportional to the a0-f0 mixing amplitude for arbitrary polar and
azimuthal angles and of the outgoing meson. This
statement is also valid for arbitrary energies, but then only at polar angles
and . The mass dependence of the differential cross
section in the reaction in the
presence of \mix mixing is also discussed.Comment: 17 pages, 3 Figure
The Impact of the First and Second Wave of the COVID-19 Pandemic on Eating Symptoms and Dysfunctional Eating Behaviours in the General Population: A Systematic Review and Meta-Analysis
Background: The aim of this systematic review and meta-analysis was to examine the prevalence of feeding and eating disorder (FED) symptoms or dysfunctional eating behaviours (DEB) in the general population during the COVID-19 outbreak. Method: We searched eligible articles in biomedical databases from 1 January 2020 to 31 March 2022. Prevalence rates of FED or DEB changes between pre-pandemic and pandemic time and correlation with psychological distress were pooled with a meta-analysis using a random-effects model. Heterogeneity was tested using I-squared (I2) statistics. A total of 186 studies with 406,076 participants met the inclusion criteria. Results: The more prevalent FED or DEB during the COVID-19 outbreak were: body image concerns (52%, 95% CI 0.38, 0.66), binge eating (40%, 95% CI 0.25, 0.55), and overeating (40%, 95% CI = 0.32-0.48). Pooled data of longitudinal studies (k = 8) only showed a significant difference in the prevalence of weight gain from pre-pandemic to the pandemic time. Finally, increased levels of psychological distress (k = 35) positively correlated with some ED symptoms. Conclusion: This meta-analysis evidenced a negative impact of the pandemic on eating symptoms and DEB in the general population
Analisi microscopica post espianto di meshes personalizzate in lega di titanio usate nella guida alla rigenerazione ossea alveolare.
Strong Decays of Strange Quarkonia
In this paper we evaluate strong decay amplitudes and partial widths of
strange mesons (strangeonia and kaonia) in the 3P0 decay model. We give
numerical results for all energetically allowed open-flavor two-body decay
modes of all nsbar and ssbar strange mesons in the 1S, 2S, 3S, 1P, 2P, 1D and
1F multiplets, comprising strong decays of a total of 43 resonances into 525
two-body modes, with 891 numerically evaluated amplitudes. This set of
resonances includes all strange qqbar states with allowed strong decays
expected in the quark model up to ca. 2.2 GeV. We use standard nonrelativistic
quark model SHO wavefunctions to evaluate these amplitudes, and quote numerical
results for all amplitudes present in each decay mode. We also discuss the
status of the associated experimental candidates, and note which states and
decay modes would be especially interesting for future experimental study at
hadronic, e+e- and photoproduction facilities. These results should also be
useful in distinguishing conventional quark model mesons from exotica such as
glueballs and hybrids through their strong decays.Comment: 69 pages, 5 figures, 39 table
Cardioprotection of PLGA/gelatine cardiac patches functionalised with adenosine in a large animal model of ischaemia and reperfusion injury: A feasibility study
A fresh look at eta2(1645), eta2(1870), eta2(2030) and f2(1910) in pbar-p -> eta + 3pizero
There is a large discrepancy between results of Crystal Barrel and WA102 for
the branching ratio R = BR[eta2(1870)->a2(1320)pi]/
BR[eta2(1870)->f2(1270)eta]. An extensive re-analysis of the Crystal Barrel
data redetermines branching ratios for decays of eta2(1870), eta2(1645),
eta2(2030) and f2(1910). This re-analysis confirms a small value for R of
1.60+-0.39, inconsistent with the value 32.6+-12.6 of WA102. The likely origin
of the discrepancy is that the WA102 data contain a strong f2(1910)->a2-pi
signal as well as eta2(1870). There is strong evidence that the eta2(1870) has
resonant phase variation. A peak in f2(1270)a0(980) confirms closely the
parameters of the a2(2255) resonance observed previously. A peak in
eta2(2030)-pi is interpreted naturally in terms of pi2(2245) with reduced
errors for mass and width M=2285+-20(stat)+-25(syst) MeV,
Gamma=250+-20(stat)+-25(syst) MeV.Comment: 25 pages, 13 figures; several major additions in final versio
Radiative Decays of Excited Vector Mesons
Radiative decays of the radial and orbital excitations of
the , and are calculated in the quark model, using wave
functions obtained variationally from the Hamiltonian with standard quark-model
parameters. The larger radiative widths should be measurable at new
high-intensity facilities being proposed, and in some cases may be measurable
in data from existing experiments. The radiative decays are a strong
discriminator between the and excitations, and can also be
used to provide unique information about the decay products.Comment: 23 pages, 6 figure
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