Aircraft-crash-locating transmitter features design improvements

Crash locater is automatically ejected from aircraft at time of crash and begins transmitting at emergency radio frequencies monitored by all airports and airport control towers. Advantages are smaller size, simpler design and installation, extended transmitting range and life, greater deployment reliability and increased crash resistance

Intertemporal Substitution in Labor Force Participation: Evidence from Policy Discontinuities

This paper presents new empirical evidence on intertemporal labor supply elasticities. We use administrative data on the census of private sector employees in Austria and variation from mandated discontinuous changes in retirement benefits from the Austrian pension system. We first present graphical evidence documenting delays in retirement in response to the policy discontinuities. Next, based on the empirical evidence, we develop a model of career length decisions. Using an estimator that exploits the graphical evidence, we estimate an intertemporal labor supply elasticity of 0.30; this relatively low estimate reflects that the disutility of labor supply rises relatively quickly with additional years of work.life-cycle labor supply, retirement decisions, intertemporal labor supply elasticity, policy discontinuities

A Novel Biostimulant, Belonging to Protein Hydrolysates, Mitigates Abiotic Stress Effects on Maize Seedlings Grown in Hydroponics

The main challenge to agriculture worldwide is feeding a rapidly growing human population, developing more sustainable agricultural practices that do not threaten human and ecosystem health. An innovative solution relies on the use of biostimulants, as a tool to enhance nutrient use ef\ufb01ciency and crop performances under sub-optimal conditions. In this work a novel biostimulant(APR\uae,ILSAS.p.A.,ArziganoVI,Italy), belongingtothegroupofproteinhydrolysates, wassuppliedtomaizeseedlingsinhydroponicanditseffectswereassessedincontrolconditionsand in the presence of three different kinds of stresses (hypoxia, salt and nutrient de\ufb01ciency) and of their combination. OurresultsindicatethatAPR\uae issolubleandisabletoin\ufb02uencerootandshootgrowth depending on its concentration. Furthermore, its effectiveness is clearly increased in condition of single or combination of abiotic stresses, thus con\ufb01rming the previously hypothesised action of this substance as enhancer of the response to environmental adversities. Moreover, it also regulates the transcription of a set of genes involved in nitrate transport and ROS metabolism. Further work will be needed to try to transfer this basic knowledge in \ufb01eld experiments

Livestock farming systems and local development: A review of the multiple dimensions of "Territory" in livestock science

A review of the international literature was carried out, in order to describe how researchers study links between livestock farming and local development (i.e. 'territory'). We highlight three different sets of approaches: the first focused on relations between livestock farming systems and natural resources through landscape / spatial analyses. Secondly, livestock farming systems are analysed through the diversity of the farming systems existing within a territory. The third set of approaches considers livestock farming systems as technical systems structured around human groups. Finally, some publications combine two or three sets of approaches. The combination of these three approaches is useful in a landscape and territorial perspective. (Résumé d'auteur

La enseñanza de estrategias de resolución de problemas matemáticos en la ESO : un ejemplo concreto

Within this article is included a description and justification of a didactical sequence to improve the learning of problem solving strategies of Secondary Education students. The design of the didactical sequence is guided by four principles: a) to context the activities and problems to solve in students' every day practices; b) to use teaching methods that show the problem solving processes; c) to design didactical materials in order to guide strategies such as selection, organisation and control; d) to facilitate the co-operative learning of problem solving strategies

Identification and characterization of the BZR transcription factor family and its expression in response to abiotic stresses in Zea mays L.

Brassinosteroids (BRs) are plant specific steroidal hormones that play diverse roles in regulating a broad spectrum of plant growth and developmental processes, as well as, in responding to various biotic and abiotic stresses. Extensive research over the years has established stress-impact-mitigating role of BRs and associated compounds in different plants exposed to various abiotic and biotic stresses, suggesting the idea that they may act as immunomodulators, thus opening new approaches for plant resistance against hazardous environmental conditions. In this research the characterization of the transcriptional response of 11 transcription factors (TFs) belonging to BRASSINAZOLE-RESISTANT 1 (BZR1) TF family of Zea mays L. was analyzed in seedlings subjected to different stress conditions. Being important regulators of the BR synthesis, BZR TFs might have stress resistance related activities. However, no stress resistance related functional study of BZR TFs has been reported in maize so far. In silico analyses of the selected 11 TFs validated the features of their protein domains, where a highest degree of similarity observed with recognized BZR TFs of rice and Sorghum bicolor. Additionally, we investigated the organ-specific expression of 11 ZmBZR in maize seedlings. Five of them did not show any transcript accumulation, suggesting that ZmBZR expression might be regulated in a manner dependent on plant developmental stage. For the remaining six ZmBZR, their ubiquitous expression in the whole plant indicates they could function as growth regulators during maize development. More importantly, in response to various stress conditions, the spatial transcript accumulation of all ZmBZR varies along the plant. All six ZmBZR showed up-regulation against N starvation, hypoxia and salt stress. On the contrary, heat stress clearly down-regulated gene expression of all ZmBZR analysed. Consistently with the expression results, the distribution of stress-related cis-acting elements in the promoter of these genes inferred that the maize BZR TFs might play some roles in regulating the expression of the corresponding genes in response to multifarious stresses. In conclusion, these data reveal that BZR TFs have stress signaling activity in maize, in addition to their confirmed role in regulating plant physiology and morphology

Intertemporal substitution in labor force participation: Evidence from policy discontinuities

This paper presents new empirical evidence on intertemporal labor supply elasticities. Weuse administrative data on the census of private sector employees in Austria and variation from mandated discontinuous changes in retirement benefits from the Austrian pension system. We first present graphical evidence documenting delays in retirement in response to the policy discontinuities. Next, based on the empirical evidence, we develop a model of career length decisions. Using an estimator that exploits the graphical evidence, we estimate an intertemporal labor supply elasticity of 0.30; this relatively low estimate reflects that the disutility of labor supply rises relatively quickly with additional years of work