An Analysis of Knowledge Structure, Diversity and Diagnostic Abilities Among Pre-Service Science Teachers Within the Domain of Oxidation and Reduction Chemistry

The purpose of this study was to investigate the development of preservice science teachers’ knowledge structures in the domain of oxidation and reduction chemistry. Knowledge structures were elicited through video-recorded semi-structured interviews before and after the unit of instruction, and analyzed using a visual flow map representation. Paralleling these interviews, the preservice teachers were tasked with diagnosing middle school students’ scientific understandings. Data analyzed quantitatively and qualitatively showed large variation in knowledge structure complexity across the preservice teachers, strong correlations between measures of knowledge structure and diversity (as defined by the Shannon Wiener diversity index), and the development of more balanced knowledge structure representations. For most preservice teachers, their diagnostic scores of the middle school students showed a small increase.     

Index for Volume 52 (1981)

Abstract

The purpose of this study was to compare fitness levels of children participating in a movement education (ME) program to Illinois fitness norms (control group). The AAHPERD Health-Related Fitness test was administered to children ages 7 through 12 during May in each of the three years, 1980–83. The skinfold measures showed that the ME children had more skinfold thickness regardless of age and gender. Scores for sit-ups and sit and reach over the three years for ME children showed that the 9- and 11-year-old ME males had more abdominal strength and 11- and 12-year-old ME females, less flexibility. Times in the mile run indicated that ME children were slower than the control group. Reference scores at the 50th and 25th percentile on the Illinois norm tables were located for each fitness measurement. These references were then used to determine the percentage of ME children who fell at or above the 50th percentile and at or below the 25th percentile. Data indicated that ME children need remediation in cardiovascular activity and reduction in subcutaneous fat.     

Exploring adolescent development through the use of popular non-fiction novels

The purpose of this review is to examine the utility of using journalistic accounts of adolescence to convey the complexities of adolescent development. Three non-fiction texts are considered: Wonderland by Michael Bamberger, A Tribe Apart by Patricia Hersch, and A Hope in the Unseen by Ron Suskind. The safe environment provided by these books gives prospective teachers an intellectual space to consider their future teaching and to hear the voices of their prospective students. Moreover, exploring these non-fiction texts helps prospective teachers understand today's adolescents and allows them to reflect on adolescent identity and development using a real-world setting.     

Administrator

Scholars have sought to identify the complexity and multidimensionality of the phenomenon of sexual identity formation since the American Psychiatric Association declassified homosexuality as a mental disorder in 1973 (Bayer, 1981). This article addresses the manner in which the needs of lesbian, gay, bisexual, transgender, and queer [LGBTQ] students can be addressed against the backdrop of Kleinman's phenomenological objectives of physical education. I argue for expanding the movement landscape in physical education to include alternatives to sport that lead to self-realization and acceptance of self. I promote the spirit of the content of significant movement including heightened awareness, sensitivity and acceptance, and realization of self as opposed to the spirit of sport. In this sense, LGBTQ students can come to know self as subject through meaningful movement experiences rather than power and performance sports. I also argue that the physical educators examine teaching practices that promote hegemonic masculinity and femininity, as well as individual views toward LGBTQ students.     

Efficient capture of circulating tumor cells with a novel immunocytochemical microfluidic device

Ability to perform cytogenetic interrogations on circulating tumor cells (CTCs) from the blood of cancer patients is vital for progressing toward targeted, individualized treatments. CTCs are rare compared to normal (bystander) blood cells, found in ratios as low as 1:10⁹. The most successful isolation techniques have been immunocytochemical technologies that label CTCs for separation based on unique surface antigens that distinguish them from normal bystander cells. The method discussed here utilizes biotin-tagged antibodies that bind selectively to CTCs. The antibodies are introduced into a suspension of blood cells intending that only CTCs will display surface biotin molecules. Next, the cell suspension is passed through a microfluidic channel that contains about 9000 transverse, streptavidin coated posts. A CTC making contact with a post has the opportunity to engage in a biotin-streptavidin reaction that immobilizes the cell. Bystander blood cells remain in suspension and pass through the channel. The goal of the present study is to establish the technical performance of these channels as a function of antigen density and operating conditions, especially flow rate. At 18 μL/min, over 70% of cells are captured at antigen densities greater than 30 000 sites/cell while 50% of cells are captured at antigen densities greater than 10 000. It is found that lower flow rates lead to decreasing cell capture probabilities, indicating that some streamlines develop which are never close enough to a post to allow cell-post contact. Future modeling and streamline studies using computational fluid dynamics software could aid in optimization of channel performance for capture of rare cells.