Romantic relationships: an important context for HIV/STI and pregnancy prevention programmes with young people

Romantic relationships are central in the lives of young people. This paper uses data on romantic relationships from urban youth in the USA to illustrate how using a relationships perspective in HIV/STI and pregnancy prevention programmes broadens the skills and content covered, and contextualises the learning to enhance relevance and use. Self-report survey data were collected using electronic handheld devices for a school-based randomised trial. The survey sample includes 911 young people (mean age = 12.4 years) representative of their schools. Logistic regressions explored associations between selected sexual behaviours and relationship characteristics. For all participants, having more boy/girlfriends, dating alone, ever touching and ever having had oral sex were associated with an increased likelihood of having vaginal sex. Among young people with current partners, having a partner three or more years older, length of relationship and ever having oral sex were associated with an increased likelihood of having vaginal sex. The study data confirm the importance of accounting for relationships in sexual risk reduction programmes, and provide avenues for enhancing the relevancy of typical school-based prevention programmes.     

PROGRESS IN APPLICATION OF THE NEUROSCIENCES TO AN UNDERSTANDING OF HUMAN LEARNING: THE CHALLENGE OF FINDING A MIDDLE-GROUND NEUROEDUCATIONAL THEORY

Modern neuroscientific research has substantially enhanced our understanding of the human brain. However, many challenges remain in developing a strong, brain-based theory of human learning, especially in complex environments such as educational settings. Some of the current issues and challenges in our progress toward developing comprehensive neuroscientific-based theories of human learning, particularly in the academic disciplines, are reviewed, beginning with a brief summary of the history of publications in science learning. This is followed by an analysis of some of the large-scale issues and conceptual problems that we currently face in developing a strong, middle-ground “neuroeducational theory” relevant to learning, especially in rather abstract disciplines such as mathematics and science. Finally, some perspectives on possible future strategies and challenges in reaching the goal of a neuroeducational theory are presented.     

Geospatial Considerations for a Multiorganizational,Landscape-Scale Program

Geospatial data play an increasingly important role in natural resources management, conservation, and science-based projects. The management and effective use of spatial data becomes significantly more complex when the efforts involve a myriad of landscape-scale projects combined with a multiorganizational collaboration. There is sparse literature to guide users on this daunting subject; therefore, we present a framework of considerations for working with geospatial data that will provide direction to data stewards, scientists, collaborators, and managers for developing geospatial management plans. The concepts we present apply to a variety of geospatial programs or projects, which we describe as a “scalable framework” of processes for integrating geospatial efforts with management, science, and conservation initiatives. Our framework includes five tenets of geospatial data management: (1) the importance of investing in data management and standardization, (2) the scalability of content/efforts addressed in geospatial management plans, (3) the lifecycle of a geospatial effort, (4) a framework for the integration of geographic information systems (GIS) in a landscape-scale conservation or management program, and (5) the major geospatial considerations prior to data acquisition. We conclude with a discussion of future considerations and challenges.     

Antibody-independent isolation of circulating tumor cells by continuous-flow dielectrophoresis

Circulating tumor cells (CTCs) are prognostic markers for the recurrence of cancer and may carry molecular information relevant to cancer diagnosis. Dielectrophoresis (DEP) has been proposed as a molecular marker-independent approach for isolating CTCs from blood and has been shown to be broadly applicable to different types of cancers. However, existing batch-mode microfluidic DEP methods have been unable to process 10 ml clinical blood specimens rapidly enough. To achieve the required processing rates of 10⁶ nucleated cells/min, we describe a continuous flow microfluidic processing chamber into which the peripheral blood mononuclear cell fraction of a clinical specimen is slowly injected, deionized by diffusion, and then subjected to a balance of DEP, sedimentation and hydrodynamic lift forces. These forces cause tumor cells to be transported close to the floor of the chamber, while blood cells are carried about three cell diameters above them. The tumor cells are isolated by skimming them from the bottom of the chamber while the blood cells flow to waste. The principles, design, and modeling of the continuous-flow system are presented. To illustrate operation of the technology, we demonstrate the isolation of circulating colon tumor cells from clinical specimens and verify the tumor origin of these cells by molecular analysis.     

Comparison of Muscle Patterning in the Overarm Throw and Tennis Serve

The muscular patterning of three skilled throwers who were less skilled servers, three skilled servers who were less skilled throwers, and three individuals skilled in both sport skills, was studied by means of electromyography and tri-plane cinematography during performances of the throw and serve. Surface electrodes were used to record electrical activity from two trunk, four shoulder girdle, and four shoulder joint muscles. Regardless of skill level, the nine female subjects used common joint and segment movements and employed, with minor exceptions, the same number of muscles during late preparatory and force production phases in the two skills. However, for the two skills, there were differences in the duration during which the muscles were active. The serve took longer to perform and involved a different sequential coordination of muscular activity than did the throw. Differences in muscle patterning between the two skills were greater during the force production phase in individuals judged to be skilled in both sport skills. The temporal differences between the two overarm skills suggested that, if performers can perceive time differences between 200 to 800 mseconds, then reference to or practice in the throw may not be a good method to gain expertise in the serve.     

Kinesthetic Perception of the Vertical as a Function of Sport Experience

Abstract

Near-infrared spectroscopy is currently used to assess changes in the oxygen saturation of the muscle during exercise. The primary purpose of this study was to assess the reliability of near-infrared spectroscopy in determining muscle oxygen saturation (StO₂) in the vastus lateralis during cycling and the gastrocnemius during running for exercise intensities at lactate threshold and maximal effort. Test-retest reliability was determined from an intraclass correlation coefficient obtained from a one-way analysis of variance. Reliability of muscle StO₂ for the gastrocnemius at lactate threshold was R = .87, and R= .88 at maximal effort. Reliability of muscle StO₂ for the vastus lateralis at lactate threshold was R= .94 and R = .99 at maximal effort.     

Mens Sana in Corpore Sano: Debating Female Sport in Argentina: 1900–46

This paper examines the intellectual debates generated by the growth of female sporting practices that occurred in Argentina between 1900 and 1946. In encouraging sporting activities as a key to perfecting the body and improving the mind, different medical, sporting, and physical education experts articulated a strongly gendered discourse. Controlled and rational sports were promoted as eugenic practices that enhanced women's childbearing capacity and improved their mothering abilities. By examining the opinions of experts about the impact of sport on the different stages in the female life cycle, this paper evaluates acceptable and objectionable physical practices and shows how these were related to social constructions of gender. As sporting practices became increasingly popular in the 1930s and 1940s, the difficulties in controlling them became more apparent, leading to concerns about their relationship to the declining birth rate, the apparent moral decline of the population, and the changes in social customs. As experts debated the implications of these changes, a new understanding of womanhood began to emerge.     

Knowledge of attention deficit hyperactivity disorder (ADHD) and attitudes toward teaching children with ADHD: THE role of teaching experience

Knowledge of attention deficit hyperactivity disorder (ADHD) and attitudes toward teaching children with ADHD are compared across stages of Australian teachers' careers. Relative to pre‐service teachers with (n = 218) and without (n = 109) teaching experience, in‐service teachers (n = 127) show more overall knowledge of ADHD, more knowledge of characteristics and treatments for ADHD, and higher perceived knowledge. In‐service teachers reported less favorable emotion about teaching children with ADHD than did pre‐service teachers without experience and more favorable behaviors than pre‐service teachers with experience. Groups did not differ in knowledge of causes of ADHD, overall attitudes, stereotypical beliefs, and beliefs about teaching children with ADHD. Identification of knowledge gaps and ambivalent attitudes will guide pre‐service and in‐service training courses. © 2012 Wiley Periodicals, Inc.