Mechanochemistry

Nano-sized molecular motors, which consume chemicals and do mechanical work are ubiquitous in nature. One of the most powerful such motors is the viral packaging motor, which consumes ATP and packages the viral DNA into the procapsid (the protein shell) of the virus. A pulling force applied to the loose end of the DNA can slow down the rate of packaging, thus showing that a mechanical force can slow down a chemical reaction. In this article we describe this packaging process and what is known about the mechanochemistry of the motor. K L Sebastian is a Professor in the Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore. His areas of interest is theoretical chemistry.     

Caregivers' perceptions of emergent literacy programming in public libraries in relation to the National Research Councils' guidelines on quality environments for children

A survey conducted at three Florida library systems examines caregivers' perceptions of emergent literacy programming and how these perceptions compare with the National Research Council's features for quality programs for children. The survey results reveal that caregivers' perceptions of emergent literacy programming align with the National Research Council's features. The data demonstrates that caregivers' perceptions are very positive toward emergent literacy programming in terms of learning and the environment. Caregivers' perceptions of the environment answers were mostly strongly agree. These results were more positive than their perceptions of learning, although they strongly agree that these programs prepare children for school, reading, and social interaction. The survey results will inform public libraries as to how to design, market, and deliver emergent literacy programming to caregivers with very young children.     

Prosodic correlates of stress in babbling: an acoustical study

Prelinguistic babbling often seems remarkably speech-like, not because it has recognizable words but because it seems to have adult-like prosody. To quantify this impression, we compared disyllabic sequences from five infants and five adults in terms of the use of frequency, intensity, and duration to mark stress. Significantly larger values for the three acoustic variables were observed on stressed than on unstressed syllables independent of syllable position for both groups. Adults showed the correlates of utterance final syllables--lower f0, lower intensity, and longer duration; infants showed only decrease in intensity. Ratios for stressed to unstressed syllables and participation of the three variables in stress production in individual disyllables were highly similar in both groups. No bias toward the English lexical trochaic stress pattern was observed. We conclude that infants in English environments produce adult-like stress patterns before they produce lexical items, which specify stress. Acoustic and perceptual analyses are used to explore stress marking by prelinguistic infants in an English language environment. Results show that infants employ the three acoustic correlates of stress in individual syllables in a manner largely similar to that of adult speakers, although they do not show second-syllable declination effects or an English language trochaic stress bias.     

The Big-fish–little-pond-effect Stands Up to Critical Scrutiny: Implications for Theory, Methodology, and Future Research

The big-fish–little-pond effect (BFLPE) predicts that equally able students have lower academic self-concepts (ASCs) when attending schools where the average ability levels of classmates is high, and higher ASCs when attending schools where the school-average ability is low. BFLPE findings are remarkably robust, generalizing over a wide variety of different individual student and contextual level characteristics, settings, countries, long-term follow-ups, and research designs. Because of the importance of ASC in predicting future achievement, coursework selection, and educational attainment, the results have important implications for the way in which schools are organized (e.g., tracking, ability grouping, academically selective schools, and gifted education programs). In response to Dai and Rinn (Educ. Psychol. Rev., 2008), we summarize the theoretical model underlying the BFLPE, minimal conditions for testing the BFLPE, support for its robust generalizability, its relation to social comparison theory, and recent research extending previous implications, demonstrating that the BFLPE stands up to scrutiny. Quotations (associated page numbers) to the Dai and Rinn (2008) article are based on a prepublication version of the article available to the authors of this article that may have changed during the final preparation for publication. The authors would also like to express thanks to David Dai and Anne Rinn for their encouragement and assistance to us in preparation of our article, whilst still acknowledging that they might not agree will all the views expressed here.     

Using Typical Infant Development to Inform Music Therapy with Children with Disabilities

This article illustrates some ways in which observations of typically-developing infants can inform music therapy and other work with children with disabilities. The research project that is described examines typical infant development with special attention to musical relatedness and communication. Videotapes of sessions centering on musical play with typically-developing infants and of music therapy sessions of children with multiple severe disabilities are examined in light of developmental issues, conceptual frameworks, and relationships between typical development and developmental issues of children with disabilities. Greenspan’s model of psychosocial development is used as a basis for analyzing observations. This research was conducted over a period of several years. Portions of what is reported here were presented at the European Music Therapy Congress, Naples, Italy (Wheeler and Stultz 2001) and the 10th World Congress of Music Therapy, Oxford, UK (Wheeler and Stultz 2002). Thanks to Elizabeth Rightmyer for very helpful feedback on the article.     

Performance strategies of US Olympians in practice and competition

Until recently, no self‐report instruments have examined psychological skills use in both practice and competition. In light of the significant role of practice in sport performance outcomes, a need exists to measure these skills in both domains. This study was designed to investigate differences in performance strategies of US Olympians in both practice and competition. The Test of Performance Strategies was administered to 176 US participants in the 2000 Sydney Olympic Summer Games. Discriminant function analyses demonstrated significant differences between medalists and nonmedalists in both the competition and practice performance strategies. Furthermore, significant gender and age differences were identified for competition strategies only. The 16 subscales of the TOPS, with two exceptions, create an internally stable instrument with moderate predictive ability relative to quality of sport performance, gender, and age in this elite sample of athletes.     

TransFormers in knowledge production: building science–practice collaborations

This article places action learning in the context of system innovation, as it studies the potential use of action learning for system change. In order to effect such system change, collaboration between actors from different institutional backgrounds is essential. To gain insight into if and how action learning can be applied for system change, we study three system change projects in Dutch agriculture. We focus specifically on the approaches developed by the project leaders for collaboration between the scientists and the entrepreneurs and analyse how the interaction between these two contributed to the learning process within the project. This article concludes with guiding concepts for action learning for system change in the field of sustainable development of agriculture and beyond.     

Determinants of Malaysian adult learners＇ distance learning

This study attempts to identify the factors perceived to be important in choosing an Institution of Higher Learning （IHL） for distance learning. One thousand five hundred questionnaires were distributed to the first year students in the social sciences distance learning programs and 980 valid responses were received of Malaysian public university. The results show that the top three factors influencing their preferred institution are qualification recognition IHL, future career advancement, and personal satisfaction. The results of this study provide insights to the IHL, employers and academics on the nature and relative importance of the factors perceived important for adult learners in the selection of their preferred IHL.     

Learner-friendly textbooks: Chemistry texts based on a constructivist view of learning

In this study, the use of inquiry methods, learning cycles, a conceptual change model and analogy in creating alternative science texts was discussed. An alternative text on the topic of acids and bases was created by integrating the methods and models discussed in this paper. The alternative text and a sample of a traditional text taken from a textbook, which is still used in Turkish high schools, were given to two groups, totaling 42 pre-service teachers—the alternative text was given to an experimental group and the traditional text to a control group—in an experimental setting and their understandings of acids and bases were compared. In addition, in the second step of the study, the pre-service teachers read both texts and indicated their preferences in terms of interest, understandability and helpfullness.