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Copyright of Revista Colombiana de Psiquiatria is the property of Asociacion Colombiana de Psiquiatria and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Education Policy Analysis Archives / Archivos Analíticos de Políticas Educativas / Arquivos Analíticos de Políticas Educativas is the property of Educational Policy Analysis Archives & Education Review and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Introduction: use of exogenous melatonin has generally been found to successfully treat sleep disturbances. In recent years it has regained interest due to its favorable effects on learning and memory. In this sense, the benefits of melatonin on other types of processes such as cognitive flexibility have not been explored. The objective of the present investigation was to determine the effect of melatonin consumption during one month on these processes in young adults with an average age of 23.5 years. Methodology: the sample consisted of 30 participants who were divided into a control group and an experimental group. The experimental group consumed 10 mg of melatonin daily for 2 months. Every three weeks, both groups were evaluated with computerized Wisconsin card tests and tapping test. Results and conclusions: melatonin had a significant improvement over abstract thinking but not about response times. [ABSTRACT FROM AUTHOR]

Teacher retention studies often focus on why teachers leave the profession, but this article suggests that focusing on why teachers stay situates rural school and community assets as the foundation to reform. The research design is a collective case study of three rural Wisconsin school districts, and findings are based on interviews and focus groups with 44 teachers and six administrators. Our study's findings reveal the centrality of relationships to teachers' decisions to stay in their rural schools. We present four relationship categories: (a) commitment to students, (b) opportunities for leadership and collaboration, (c) connections to community, and (d) personal and professional ties. Our study suggests the need for a conceptual reframing, or a new way of thinking, in research on teacher retention. Practical implications for addressing rural teacher retention are also surfaced, suggesting a new way of "doing" that situates school-community relationships at the center. [ABSTRACT FROM AUTHOR]

Objective. Analyzed the effect of xylan and rice husk as sole sources of carbon on the FAE activity and expression of faeA and faeB genes of Penicillium rubens (Wisconsin 54-1255), in submerged fermentation. Materials and methods. The fermentations were carried out for 24, 48, and 72 h (28°C/250 rpm), in flasks with a modified Sakamoto medium. FAE activity was determined using the synthetic substrate Ethyl 4-hydroxy-3-methoxycinnamate. The transcription of faeA and faeB was analyzed by RT-PCR. The PCR products were resolved by electrophoresis and analyzed by densitometry. Results. The analysis of gene expression showed that the use of xylan had a positive effect on the expression of both genes. The highest transcriptional activity of both faeA and faeB was detected at 48 h. On the other hand, rice husk showed negative results. The data obtained when the FAE activity was determined, supported the results observed in the gene expression analysis. Conclusion. Different from xylan the rice husk did not demonstrate an inducer effect on the feruloyl esterase activity in P. rubens. [ABSTRACT FROM AUTHOR]

The robustness of the Mahalanobis-Taguchi System to different arrays that could be used to discriminate variables in a study, is evaluated.. For this, different levels of fractional factorial design 29 were used, as well as all possible fractions for each level to find out if the results varied depending on the array utilized. For this analysis the Wisconsin's breast cancer data reported in a publication were used, in which, an orthogonal array L12 was employed. In this work, the analysis was performed with 29-k designs (k = 0,1,2,3,4 and 5) and all the possible fractions for each value of k generated using the software Minitab 15 and a Matlab program was generated. The results showed that this method is not robust to the different arrays that could be used. [ABSTRACT FROM AUTHOR]

Copyright of Revista Interuniversitaria de Formación del Profesorado is the property of Asociacion Universitaria de Formacion del Profesorado (AUFOP) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)