Wie Angst sportliche Leistung beeinträchtigt – und was man dagegen tun kann: Das Kraftspeichermodell der Selbstkontrolle im Sportkontext

Die meisten SportlerInnen kennen die Situation: Man befindet sich mitten in einem wichtigen sportlichen Wettkampf und plötzlich überkommt einen ein Gefühl von Angst. Die einfachsten motorischen Bewegungen möchten einfach nicht mehr gelingen, man kann das Optimum nicht abrufen und versagt. Doch Abhilfe ist unterwegs: Neueste Studien liefern Hinweise darauf, dass man dem negativen Einfluss von Angst im Sportkontext entgegenwirken kann, wenn man über ausreichend Selbstkontrollkraft verfügt.

Human impacts and aridity differentially alter soil N availability in drylands worldwide

Aims Climate and human impacts are changing the nitrogen (N) inputs and losses in terrestrial ecosystems. However, it is largely unknown how these two major drivers of global change will simultaneously influence the N cycle in drylands, the largest terrestrial biome on the planet. We conducted a global observational study to evaluate how aridity and human impacts, together with biotic and abiotic factors, affect key soil variables of the N cycle. Location Two hundred and twenty-four dryland sites from all continents except Antarctica widely differing in their environmental conditions and human influence. Methods Using a standardized field survey, we measured aridity, human impacts (i.e. proxies of land uses and air pollution), key biophysical variables (i.e. soil pH and texture and total plant cover) and six important variables related to N cycling in soils: total N, organic N, ammonium, nitrate, dissolved organic:inorganic N and N mineralization rates. We used structural equation modelling to assess the direct and indirect effects of aridity, human impacts and key biophysical variables on the N cycle. Results Human impacts increased the concentration of total N, while aridity reduced it. The effects of aridity and human impacts on the N cycle were spatially disconnected, which may favour scarcity of N in the most arid areas and promote its accumulation in the least arid areas. Main conclusions We found that increasing aridity and anthropogenic pressure are spatially disconnected in drylands. This implies that while places with low aridity and high human impact accumulate N, most arid sites with the lowest human impacts lose N. Our analyses also provide evidence that both increasing aridity and human impacts may enhance the relative dominance of inorganic N in dryland soils, having a negative impact on key functions and services provided by these ecosystems.

Molecular Characterization and Risk Factors of Giardia duodenalis among School Children from La Habana, Cuba

Giardia duodenalis is considered the most common protozoan infecting humans worldwide. Molecular characterization of G. duodenalis isolates has revealed the existence of eight groups (assemblages A to H) which differ in their host distribution. A cross-sectional study was conducted in 639 children from La Habana between January and December 2013. Two assemblage-specific PCRs were carried out for the molecular characterization. The overall prevalence of Giardia infection was 11.9%. DNA from 63 of 76 (82.9%) samples was successfully amplified by PCR-tpi, while 58 from 76 (76.3%) were detected by PCRE1-HF. Similar results by both PCRs were obtained in 54 from 76 samples (71%). According to these analyses, assemblage B and mixed assemblages A + B account for most of the Giardia infections in the cohort of children tested. Our current study identified assemblage B as predominant genotype in children infected with Giardia. Univariate analysis indicated that omission of washing hands before eating and keeping dogs at home were significant risk factors for a Giardia infection. In the future, novel molecular tools for a better discrimination of assemblages at the subassemblages level are needed to verify possible correlations between Giardia genotypes and symptomatology of giardiasis.

"Wir Juden tun mehr als unsere Pflicht"

A. Mahler

Was kann und soll der Jüdische Nationalfonds zur Förderung der Ansiedlung der Jemeniten in Palästina tun?

Jehoschuah Feldmann

Was sollen nun die Juden tun?

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Franz Ottwalt: Denn sie wissen, was sie tun [Rezension]

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“El rabdomante sagrado", texto metapoético de Jorge Enrique Ramponi

En el presente trabajo se realiza un análisis del poema “El rabdomante sagrado", de Los límites y el caos (1972) de Jorge Enrique Ramponi. El poema se incluye en la categoría de los textos metapoéticos y su simbolismo se interpreta desde las claves hemenéuticas que esta calificación ofrece. Se propone de esta manera contribuir al conocimiento de una obra de gran densidad poética.

La perspectiva americana de José Enrique Rodó desde el Capitolio de Roma

Fil: Aínsa, Fernando.

González, Horacio. Filosofía de la conspiración. Marxistas, peronistas y carbonarios. Buenos Aires, Colihue, 2004, 380 p

Fil: Steszak, Germán. Universidad Nacional de Cuyo