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161.
Numerous studies have addressed sex estimation from the hands and feet with varying results. These studies have utilized multiple measurements to determine sex from the hands and feet, including measures of robusticity (e.g., base width and midshaft diameter). However, robusticity measurements are affected by activity, which can disguise underlying patterns of sexual dimorphism. The purpose of this study is to investigate the utility of length measurements of the hands and feet to estimate sex. The sample consists of white females (n=123) and males (n=136) from the Terry Collection. Discriminant function analysis was used to classify individuals by sex. The left hand outperformed both the right hand and foot producing correct classification rates exceeding 80%. Surprisingly, the phalanges were better sex discriminators than either the metacarpals or metatarsals. This study suggests that length measures are more appropriate than robusticity measures for sex estimation. 相似文献
162.
Jonathan D. Bethard Ph.D. Jacqueline M. Berger M.S. Justin Maiers M.S. Ann H. Ross Ph.D. 《Journal of forensic sciences》2019,64(4):1125-1128
Estimating age‐at‐death of individuals represented only by skeletonized human remains is a fundamental aspect of forensic anthropological casework. Recently, several researchers have proposed that bone mineral density (BMD) is a useful predictor of age‐at‐death in forensic contexts. Navega et al. (JFS 63(2):497–503) developed an online application called DXAGE for calculating age‐at‐death from BMD parameters. This study tests the utility of DXAGE by utilizing data from the National Health and Nutrition Examination Survey (NHANES). BMD data from a female subsample (n = 470) of the NHANES 2007–2008 dataset were analyzed, and the relationship between predicted age and real age was examined. Inaccuracy was 14.25 years, and bias was ?7.20 years. Results show that there is a weak correlation between predicted and actual age (r = 0.47) using the DXAGE application. While BMD data are potentially useful for predicting age age‐at‐death, the DXAGE application should be used cautiously in forensic anthropological contexts. 相似文献
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Few formal post-secondary educational programs in the United States focus on youth work, thus youth workers often enter the field with diverse backgrounds and varying levels of experience working with youth. Drawing on mounting evidence that quality youth service requires skilled staff, professional-development opportunities have received increasing support by agencies and funders. Typically, youth work professional development supports propositional (theory) knowledge learning to develop a more skilled workforce. This article describes an approach to youth work professional development that supports professional-craft knowledge learning (practice wisdom). Based on action research methodology, the approach has been developed over the last three years with groups of youth workers in a public organization. Using program evaluation data over the last two years and university-facilitator reflections, the authors describe what have been found to be the critical components of this approach. Also discussed are implications of using such an approach in day-to-day youth work practice. 相似文献
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The use of chemically modified indicator erythrocytes for hemagglutination reactions can result in increased sensitivity. Treatment of erythrocytes with polyvinylpyrrolidone (PVP) or dextran T40 (10% weight/volume) induces changes in the cell surface in the form of extensions and blebbing, thereby increasing the surface area. These sensitized cells can be used in forensic science when detection or quantitation of erythrocyte surface reacting antibodies is important. The effect of altering membrane lipid fluidity on erythrocyte surface antigens has also been investigated. Treatment of cells with a reagent that increases the membrane ratio of cholesterol to phospholipid results in enhanced hemagglutination capacity despite the lack of extensive spiculation. 相似文献
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