Are Africans,Europeans, and Asians Different “Races”? A Guided-Inquiry Lab for Introducing Undergraduate Students to Genetic Diversity and Preparing Them to Study Natural Selection

Many students do not recognize that individual organisms within populations vary, and this may make it difficult for them to recognize the essential role variation plays in natural selection. Also, many students have weak scientific reasoning skills, and this makes it difficult for them to recognize misconceptions they might have. This paper describes a 2-h laboratory for college students that introduces them to genetic diversity and gives them practice using hypothetico-deductive reasoning. In brief, the lab presents students with DNA sequences from Africans, Europeans, and Asians, and asks students to determine whether people from each continent qualify as distinct "races." Comparison of the DNA sequences shows that people on each continent are not more similar to one another than to people on other continents, and therefore do not qualify as distinct races. Ninety-four percent of our students reported that the laboratory was interesting, and 79% reported that it was a valuable learning experience. We developed and used a survey to measure the extent to which students recognized variation and its significance within populations and showed that the lab increased student awareness of variation. We also showed that the lab improved the ability of students to construct hypothetico-deductive arguments.     

Whole-body and multi-joint kinematic control strategy variability during backward rotating dismounts from beam

The aim of this study was to develop insight into the whole-body and multi-joint kinematic control strategy variability associated with the execution of fundamental backward rotating dismounts from beam. Two-dimensional joint centre coordinate data were obtained for ten backward piked and backward tucked somersault dismount skills performed by four female gymnasts (N = 80 trials). Gymnast-specific and group variability in whole-body and multi-joint discrete kinematic measures were compared for the aerial and impact phase of backward piked and backward tucked skills. The backward tucked skill was executed using a more variable knee joint angular velocity at take-off (mean difference in standard deviation ± SD: -2.6 ± 1.0 rad · s(-1); P < 0.01) than the backward piked skill. The variability in the whole-body and multi-joint kinematic responses produced between the impact phases of each skill was gymnast-specific. The greater variability in the localized knee joint action at take-off was considered indicative of the diverse shape element demands and key performance outcomes of the two skills. Self-selected modulations to the multi-joint kinematic strategy used in the impact phase suggested customization of the joint loading adjustments in executing the fundamental dismount skills.     

Influence of longswing technique on the kinematics and key release parameters of the straddle Tkachev on uneven bars

Tkachev on uneven bars is a release and re-grasp skill performed using variations of preparatory longswing techniques; the reasons why different techniques are chosen remains unclear. This study examined kinematic and key release parameters specific to three distinct techniques with the aim of understanding the relative benefits of each. During two international artistic gymnastics competitions six arch, straddle and pike longswings preceding the straddle Tkachev were recorded using twin video cameras. Calibration and movement images were digitised and reconstructed using 3D DLT. Shoulder and hip angular kinematics, angular momentum and key release parameters were compared between techniques. In the arch longswing, the first and second hip functional phases began significantly earlier than the straddle or pike. No significant differences were established for release parameters although large effect sizes for horizontal release velocity and angular momenta about the mass centre and bar were reported between the arch and other two variants. Therefore, the arch variant may provide the opportunity to develop more complex combinations following the Tkachev. Providing insight into mechanical advantages of specific longswing techniques, and highlighting those that elicit desirable characteristics offers the potential to provide coaches with objective data on technique selection and ultimately skill development.     

Writing academic papers: lost in translation?

The process of writing for publication is a challenging one. It moves us from the spoken and written word into a realm that requires us to provide supporting evidence to develop an argument in a logical and progressive way. In English language journals, as elsewhere, the quality of the written word is a determining factor in the likelihood of a paper being accepted for publication. By reading past issues of a targeted journal, drawing on the expertise of colleagues and responding positively to feedback, it is possible to significantly enhance your prospects of publication.     

Cost-effective ways of delivering enquiry services: a rapid review

Background: In the recent times of recession and budget cuts, it is more important than ever for library and information services to deliver cost‐effective services. Objectives: This rapid review aims to examine the evidence for the most cost‐effective ways of delivering enquiry services. Methods: A literature search was conducted on LISA (Library and Information Sciences Abstracts) and MEDLINE. Searches were limited to 2007 onwards. Results: Eight studies met the inclusion criteria. The studies covered hospital and academic libraries in the USA and Canada. Services analysed were ‘point‐of‐care’ librarian consultations, staffing models for reference desks and virtual/digital reference services. Conclusions: Transferable lessons, relevant to health library and information services generally, can be drawn from this rapid review. These suggest that ‘point‐of‐care’ librarians for primary care practitioners are a cost‐effective way of answering questions. Reference desks can be cost‐effectively staffed by student employees or general reference staff, although librarian referral must be provided for more complex and subject‐specific enquiries. However, it is not possible to draw any conclusions on virtual/digital reference services because of the limited literature available. Further case analysis studies measuring specific services, particularly enquiry services within a health library and information context, are required.     

Predictors of Cheating among Early Adolescents: Academic and Social Motivations

This study examined the relations between middle school students' self-reported cheating and several indicators of academic and social motivation. It was hypothesized that students' academic self-efficacy and personal and classroom goal orientations would predict cheating. Social motivations were presumed to predict cheating above and beyond achievement motivation. Four dimensions of relationships within schools were measured: participation structure, teacher commitment and competence, teacher respect, and sense of school belonging. Logistic regression analyses were used to predict classification as a cheater or noncheater. Although academic motivation variables predicted cheating, the addition of the relationship variables significantly improved the classification rates. The final model included grade in school, academic self-efficacy, extrinsic goal orientation, participation structure, teacher commitment, and teacher respect. Copyright 2001 Academic Press.     

Social inequalities in body weight and physical activity: exploring the role of fitness centers

Fitness centers are a viable option for physical activity, particularly in climates with significant weather variation. Due to variation in economic and social expressions ofexclusivity, fitness centers may have some relation to social inequalities in physical inactivity and related health outcomes; thus, our objective was to explore this relation. Using publicly available data and guided by Bourdieu's theory of habitus, we classified fitness centers in Calgary, Canada, on three dimensions of exclusivity (economic, social, and appearance). We found that, although some highly exclusive centers exist, most demonstrated low exclusivity based on our dimensions. An overall contribution of centers to inequalities appears to be limited; however, caution is warranted in light of cutbacks to municipal budgets that can have an impact on publicly funded facilities.