Meeting in the Middle: The Role of Mutual Biracial Friends in Cross-Race Friendships     

Leslie Echols  Sandra Graham 《Child development》2020,91(2):401-416

Social network analysis was used to examine the role of having a mutual biracial friend on cross-race friendship nominations among monoracial sixth-grade students (M_age = 10.56 years) in two racially diverse middle schools (n = 385; n = 351). Monoracial youth were most likely to choose same-race peers as friends but more likely to choose biracial than different-race peers as friends, suggesting that racial homophily may operate in an incremental way to influence friendships. Monoracial different-race youth were also more likely to be friends if they had a mutual biracial friend. The findings shed light on the unique role that biracial youth play in diverse friendship networks. Implications for including biracial youth in studies of cross-race friendship are discussed.  相似文献   

Impact of age on host responses to diet-induced obesity:Development of joint damage and metabolic set points     

Kelsey H.Collins  Graham Z.MacDonald  David A.Hart  Ruth A.Seerattan  Jaqueline L.Rios  Raylene A.Reimer  Walter Herzog 《运动与健康科学(英文)》2020,9(2):132-139,197

Background:Osteoarthritis is one of the leading causes of pain and disability worldwide,and a large percentage of patients with osteoarthritis are individuals who are also obese.In recent years,a series of animal models have demonstrated that obesity-inducing diets can result in synovial joint damage(both with and without the superimposition of trauma),which may be related to changes in percentage of body fat and a series of low-level systemic inflammatory mediators.Of note,there is a disparity between whether the dietary challenges commence at weaning,representing a weanling onset,or at skeletal maturity,representing an adult onset of obesity.We wished to evaluate the effect ofthe dietary exposure time and the age at which animals are exposed to a high-fat and high-sucrose(HFS) diet to determine whether these factors may result in disparate outcomes,as there is evidence suggesting that these factors result in differential metabolic disturbances.Based on dietary exposure time,we hypothesized that rats fed an HFS diet for 14 weeks from weaning(HFS Weanling) would demonstrate an increase in knee joint damage scores,whereas rats exposed to the HFS diet for 4 weeks,starting at 12 weeks of age(HFS Adult) and rats exposed to a standard chow diet(Chow)would not display an increase in knee joint damage scores.Methods:Male Sprague-Dawley rats were fed either an HFS diet for 14 weeks from weaning(HFS Weanling) or an HFS diet for 4 weeks,starting at 12 weeks of age(HFS Adult).At sacrifice,joints were scored using the modified Mankin Criteria,and serum was analyzed for a defined subset of inflammatory markers(Interleukin-6,leptin,monocyte chemoattractant protein-1,and tumor necrosis factorα).Results:When the HFS Weanling and HFS Adult groups were compared,both groups had a similar percent of body fat,although the HFS Weanling group had a significantly greater body mass than the HFS Adult group.The HFS Weanling and HFS Adult animals had a significant increase in body mass and percentage of body fat when compared to the Chow group.Although knee joint damage scores were low in all 3 groups,we found,contrary to our hypothesis,that the HFS Adult group had statistically significant greater knee joint damage scores than the Chow and HFS Weanling groups.Furthermore,we observed that the HFS Weanling group did not have significant differences in knee joint damage scores relative to the Chow group.Conclusion:These findings indicate that the HFS Weanling animals were better able to cope with the dietary challenge of an HFS diet than the HFS Adult group.Interestingly,when assessing various serum proinflammatory markers,no significant differences were detected between the HTS Adult and HFS Weanling groups.Although details regarding the mechanisms underlying an increase in knee joint damage scores in the HFS Adult group remain to be elucidated,these findings indicate that dietary exposure time maybe less important than the age at which an HFS diet is introduced.Moreover,increases in serum proinflammatory mediators do not appear to be directly linked to knee joint damage scores in the HFS Weanling group animals but may be partially responsible for the observed knee joint damage in the adults over the very short time of exposure to the HFS diet.  相似文献   

How schools work: an inside account of failure and success from one of the nation’s longest-serving secretaries of education     

Sandra Stotsky 《Journal of School Choice》2019,13(1):128-130

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Connected migrants: Encapsulation and cosmopolitanization     

Koen Leurs  Sandra Ponzanesi 《Popular Communication》2018,16(1):4-20

ABSTRACT

Taking a cue from Dana Diminescu’s seminal manifesto on “the connected migrant,” this special issue introduces the notions of encapsulation and cosmopolitanism to understand digital migration studies. The pieces here present a nonbinary, integrated notion of an increasingly digitally mediated cosmopolitanism that accommodates differences within but also recognizes Europe’s colonial legacy and the fraught postcolonial present. Of special interest is an essay by the late Zygmunt Bauman, who argues that the messy boundaries of Europe require a renewed vision of cosmopolitan Europe, based on dialogue and aspirations, rather than on Eurocentrism and universal values. In this article, we focus on three overarching discussions informing this special issue: (a) an appreciation of the so-called “refugee crisis” and the articulation of conflicting Europeanisms, (b) an understanding of the relationships between the concepts of cosmopolitanization and encapsulation, and (c) a recognition of the emergence of the interdisciplinary field of digital migration studies.  相似文献   

Resisting Erasure and Developing Networks of Solidarity: Testimonios of Two Puerto Rican Scholars in the Academy     

Carmen M. Martínez-Roldán  Sandra Quiñones 《Journal of Language, Identity & Education》2016,15(3):151-164

In this article, we share findings from a critical qualitative study aimed at better understanding the ways that language, history, and geography mediate our work and identities as educational researchers. As scholars whose particular sociocultural and political histories are often absent in scholarly discussions about language and education, we use the intergenerational sharing of testimonios as both methodology and narrative development to gain a deeper understanding of experiences involving the learning and use of English that influence our academic careers. We theorize our experiences as resisting erasure and contribute to Latina epistemology scholarship and critical educational research about Puerto Ricans in the United States. Moreover, we forward the concept of funds of knowledge as a professional practice. Telling our stories and developing mentoring networks is necessary for our individual and collective functioning and well-being as scholars; it cultivates solidarity as a means of thriving in the academy.  相似文献   

Commentary: the coalition for improving maternity services:     

Hodges S  Stewart SB  Hotelling B  Romano A 《The Journal of perinatal education》2007,16(Z1):93S-96S

A consumer advocate, two childbirth educators, and a certified nurse-midwife each provide commentary on the effectiveness of and potential uses for the Evidence Basis for the Ten Steps of Mother-Friendly Care.  相似文献   

Reconceptualizing the Elementary Science Methods Course Using a Reflection Orientation     

Sandra K. Abell  Lynn A. Bryan 《Journal of Science Teacher Education》1997,8(3):153-166

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Parameter Estimation Accuracy of the Effort-Moderated Item Response Theory Model Under Multiple Assumption Violations     

Joseph A. Rios  James Soland 《Educational and psychological measurement》2021,81(3):569

As low-stakes testing contexts increase, low test-taking effort may serve as a serious validity threat. One common solution to this problem is to identify noneffortful responses and treat them as missing during parameter estimation via the effort-moderated item response theory (EM-IRT) model. Although this model has been shown to outperform traditional IRT models (e.g., two-parameter logistic [2PL]) in parameter estimation under simulated conditions, prior research has failed to examine its performance under violations to the model’s assumptions. Therefore, the objective of this simulation study was to examine item and mean ability parameter recovery when violating the assumptions that noneffortful responding occurs randomly (Assumption 1) and is unrelated to the underlying ability of examinees (Assumption 2). Results demonstrated that, across conditions, the EM-IRT model provided robust item parameter estimates to violations of Assumption 1. However, bias values greater than 0.20 SDs were observed for the EM-IRT model when violating Assumption 2; nonetheless, these values were still lower than the 2PL model. In terms of mean ability estimates, model results indicated equal performance between the EM-IRT and 2PL models across conditions. Across both models, mean ability estimates were found to be biased by more than 0.25 SDs when violating Assumption 2. However, our accompanying empirical study suggested that this biasing occurred under extreme conditions that may not be present in some operational settings. Overall, these results suggest that the EM-IRT model provides superior item and equal mean ability parameter estimates in the presence of model violations under realistic conditions when compared with the 2PL model.  相似文献   

Understanding curriculum as geo/biospheric text     

Bigloo  Fay  Scott  Sandra  Adler  Douglas 《Prospects》2021,51(1-3):117-128

PROSPECTS - The world is experiencing crises related to the cascading effects of anthropization. These crises result from imperialist and capitalist practices that categorize and exploit the other...  相似文献   

The exotic world of Pierre Pomet's A Compleat History of Druggs     

Sherman S 《Endeavour》2004,28(4):156-160

The English translation of Pierre Pomet's A Compleat History of Druggs (1712) demonstrates how the expansion of print culture altered the way that scientific ideas were communicated. Although it makes utilitarian claims, the text of the History departs from the style of contemporary British pharmacopoeias by emphasizing the exotic aspects of drugs. In this sense, the text exemplifies how Enlightenment science could be sold to a cross-over audience interested as much in the fantastical as in the quality and operation of drugs.  相似文献