Biomolecular characterization,identification, enzyme activities of molds and physiological changes in sweet potatoes (<Emphasis Type="Italic">Ipomea batatas</Emphasis>) stored under controlled atmospheric conditions

Microbial attacks during storage are one of the primary causes of product deterioration, and can limit the process of prolonging the shelf-life of harvested food. In this study, sweet potatoes were stored at temperatures of 13, 21, and 29 °C for 4 weeks. Samples were collected during storage and plated on potato dextrose agar, from which axenic mold cultures were obtained and identified using 26S rRNA gene sequences. Physiological changes of potato tubers were assessed with respect to pathogenicity, enzyme activity, and atmospheric storage conditions. Six fungal species were identified, namely Penicillium chrysogenum (P. rubens), P. brevicompactum, Mucor circinelloides, Cladosporium cladosporiodes, P. expansum, and P. crustosum. The following fungal isolates, namely P. expansum, P. brevicompactum, and Rhizopus oryzae, were recovered from the re-infected samples and selected according to their levels of enzyme activity. This study revealed high levels of activity for cellulase and pectinase, which were most notable during the initial three days of testing, and were followed by a steady decrease (P<0.05). Polygalacturonase activity was prominent with values ranging from 12.64 to 56.79 U/mg (P. expansum) and 18.36 to 79.01 U/mg (P. brevicompactum). Spoilage was obvious in the control group, which had a 100% decay at the end of the experimental period compared with samples treated with iprodione and sodium hypochlorite, in which the decay rates were 5% and 55%, respectively. The data for the iprodione- and sodium hypochlorite-treated samples at the end of the 3-month storage period showed that they were significantly different (P=0.041), with the sodium hypochlorite-treated samples producing twice the rate of infection compared to the iprodione-treated samples. The comparative rate of the progression of decay in the treated samples can be expressed as iprodione<sodium hypochlorite<control. This study demonstrates that sweet potato tissue damage is due to the activities of microbial enzymes and, in particular, the pectinases of the organisms isolated from the infected potato tissues, and suggests the advantages of utilizing iprodione as a curing agent for potato tubers before storage.     

Intentionality and Thinking as ‘Hearing’. A Response to Biesta’s Agenda

In his 2012 article Philosophy of Education for the Public Good: Five Challenges and an Agenda, Gert Biesta identifies five substantial issues about the future of education and the work required to address these issues. This article employs a Heideggerian reading of education to evaluate ‘Biesta’s truth’. I argue that Biesta’s point of view (a) underestimates knowledge’s predominance and relativism; (b) frames intentionality in pre-Heideggerian terms, which—although not a problem in itself because an individual is free to choose a particular perspective on the concept—raises the issue of consistency in Biesta’s theoretical framework; and (c) a final criticism concerns Biesta’s choice of tools for engaging with the identified challenges: The primary tools Biesta uses are intrinsic to the perspective he challenges. The use of a ‘first person perspective’ to frame pedagogy that focuses on the subject and ‘subjectification’ reaffirms the fundamental Western gesture that makes human beings subjects who ‘stand-over-and-against’ the world. I argue that it is possible to penetrate Plato’s ‘theoretical gaze’ and find a ‘weak’ alternative to an all-encompassing point of view of education through a Heideggerian approach that regards intentionality and thinking as ‘hearing’.     

Parent Motivation Strategies and the Performance of Preschoolers in a Rural Philippine Municipality

Although under-investment in children is an identified problem in low-income developing countries (LDC) and the establishment and use of preschools has been advocated as a partial remedy, the readiness of children and parents for preschool in LDC has been little studied. This paper assesses motivational techniques that parents report using with preschool children in a rural Philippine municipality. The purposes of this study were to examine: (a) whether the motivation strategies used by parents are consistent with a “balanced, holistic approach” to child development and (b) whether the parents’ motivational strategies are associated with school performance. The study suggests some over-weighting by parents of academic achievement, but otherwise more appropriate child-oriented behaviors were observed than reported in some research. Motivation by parents also was associated with preschool performance.     

Inclusivity,participation and collaboration: Learning in interactive groups

ABSTRACT

Background: Interaction, participation and collaboration are thought to be important factors for supporting successful second or foreign language learning. The use of Interactive Groups (IGs) is regarded as helpful in creating the conditions in which interaction, participation and collaboration are increased to create effective dialogic learning. However, there is limited understanding of the role of IGs in supporting second or foreign language learning.

Purpose: The aim of the present study was to explore the opportunities that IGs generated for supporting interaction, participation and collaboration in a situation where students were learning English as a foreign language.

Method: A communicative methodology was used to collect and analyse observational and interview data from three classrooms where teaching and learning was organised through IGs, each in a different school in Spain involved in Schools as Learning Communities: Successful Educational Actions (SEAs). Across the three classrooms, there were 58 students, three teachers and 14 volunteers, whose role was to support and encourage communication. The schools served low SES communities. We conducted eight classroom observations and 17 semi-structured interviews. The data were analysed qualitatively.

Findings: The thematic analysis suggested that, in the classrooms that were studied, there was evidence that participants and observers felt that IGs promoted effective conditions for the inclusive participation of all learners, created a favourable climate for collaborative interactions regarding the target language and raised learning expectations for all students. In addition, the contribution of the volunteers was identified as crucial to the successful functioning of the IGs.

Conclusion: This small scale, qualitative study highlights the potential for IGs to create favourable conditions for the learning of English and other languages as a foreign language. More extensive studies are needed to determine the best way to use IGs for the teaching and learning of foreign languages in other contexts.     

Portraits of PBL: students' experiences of the characteristics of problem-based learning in physiotherapy,computer engineering and psychology

The present study is part of acomprehensive research project with the generalaims of comparing how problem-based learning isrealised in three different professionaleducational programmes. The specific aims ofthis study are to describe and analyse howstudents in the three different programmesconceive of the meaning of problem-basedlearning and how they experience their studieswithin a problem-based learning programme. ThePBL programmes are a Bachelor's programme inPhysiotherapy, a Master's programme inPsychology, and a Master's programme inComputer Engineering. Data were analysedqualitatively. The results reveal differencesin how the students in the three programmesconceive of their autonomy as learners,co-operation with their counterparts and theauthenticity of the learning task. The findingspossibly also reflect the taken-for-grantedperspectives of knowledge, embedded in thecultures of the professional practices and thescientific disciplines to which the programmespertain.     

The “Batman Effect”: Improving Perseverance in Young Children

This study investigated the benefits of self‐distancing (i.e., taking an outsider's view of one's own situation) on young children's perseverance. Four‐ and 6‐year‐old children (N = 180) were asked to complete a repetitive task for 10 min while having the option to take breaks by playing an extremely attractive video game. Six‐year‐olds persevered longer than 4‐year‐olds. Nonetheless, across both ages, children who impersonated an exemplar other—in this case a character, such as Batman—spent the most time working, followed by children who took a third‐person perspective on the self, or finally, a first‐person perspective. Alternative explanations, implications, and future research directions are discussed.     

Investigating Computer Application Technology Teachers’ Procedural Knowledge and Pedagogical Practices in ICT- Enhanced Classrooms

Helping beginner and veteran teachers to develop technological knowledge and skills in how to use new information and communications technologies (ICTs) to teach is a critical component of teacher preparation in this digital age. This article reports on a study in which 117 beginner and veteran (experienced) Computer Application Technology (CAT) teachers at 11 government Further Education and Training (FET) colleges in Gauteng, South Africa, completed a 65-item questionnaire. The questionnaire addressed 13 knowledge constructs, using a 5-point scale which addressed the nature and context of CAT teachers’ procedural, functional and pedagogical content knowledge (PrFPACK) in an ICT-enhanced classroom. Additional data was solicited using classroom observation and interviews to understand CAT teachers’ PrFPACK and e-skills in the use of ICT resources. The data was analysed using confirmatory factor analysis and thematic analysis. The research findings revealed a number of significant differences in beginner and veteran CAT teachers’ PrFPACK. The results of the study confirmed that professional development of beginner and veteran teachers in the use of new ICTs in the digital age should be an ongoing effort in all educational institutions. It is imperative to train both beginner and veteran CAT teachers in an innovative method of teaching with ICT resources.     

Youth in the context of chronic unemployment in Spain and Brazil

ABSTRACT

The article argues that chronic unemployment has become the main context of youth policies in Spain and Brazil. Our point is that the current structural crisis of the capitalist system eventually provokes chronic unemployment. To be precise, both business and international organisations have endorsed structural adjustments and austerity policies that have destroyed productive forces through expropriation and exploitation in many countries, thus expanding chronic unemployment despite youth policies claiming otherwise. In Spain, two public policies try to circumvent the adverse situation of many youth, namely: the Quality of Education Act (LOMCE) and the Youth Guarantee Scheme. Brazil follows the same logic of these policies through initiatives such as the High School reform and Projovem program. However, in both countries the structural crisis threatens the future of young generations despite these fashionable policies exclusively targeted to them.     

Parent-child interaction as a dynamic contributor to learning and cognitive development in typical and atypical development / Influencia dinámica entre la interacción padre/madre-hijo y el aprendizaje y el desarrollo cognitivo en el desarrollo típico y atípico

Abstract

Converging evidence suggests that parent-infant interaction is one of the most crucial formative influences on child development. In neurodevelopmental disorders, however, different timings and trajectories of development may add a layer of difficulty to the existing challenges of dyadic interaction. The current study therefore set out to compare the specific aspects of dyadic interaction (i.e., responsiveness, directiveness, attentiveness, positive affect, liveliness, mutuality and engagement) between parent-infant dyads with Down syndrome, Williams syndrome and typical development. Video clips of parent-infant play interaction were rated using a validated tool, namely, the Social Interaction Measure for Parents and Infants. Significant effects emerged with respect to infant group on the quality of dyadic interaction, with the multiple comparison tests revealing differences between atypically and typically developing infant-parent dyads. The findings are discussed in relation to the effects of dyadic interaction on the linguistic and socio-cognitive development of atypical children.     

Reciprocal influences between stressful life events and adolescent internalizing and externalizing problems

Investigated in this study were hypothesized reciprocal influences between stressful life events and adolescent maladjustment using data from a 6-year, prospective longitudinal study. Stressful life experiences, internalizing symptoms, and externalizing behaviors were assessed for a sample of adolescents (215 males, 236 females) living in the rural Midwest. From 7th to 12th grades, autoregressive analyses showed that stressful life events and these two forms of maladjustment were reciprocally interrelated over time. For example, stressful life events at one point significantly predicted delinquent behaviors 1 year later, which, in turn, significantly predicted stressful life events 1 year later, and vice versa. The findings provide evidence for the accumulating disadvantage for adolescents that results from the mutual reinforcement of problematic situations and adjustment problems over time.