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141.
Fuller J 《Science of aging knowledge environment : SAGE KE》2002,2002(25):pe11
Hematopoiesis is a process by which a single cell--called a hematopoietic stem cell (HSC)--has the proliferative potential to give rise to all of the major lineages of blood and immune cells. Stem cells can undergo both symmetric division, which results in two copies of the parent stem cell, and asymmetric division, which results in self-renewal of the parent stem cell as well as production of a daughter cell that is capable of differentiating along a specific lineage. A number of different elements of HSC replication change with age, even though these transformations do not appear to result in hematopoietic deficiencies under normal circumstances. In this Perspective, the author discusses these age-related alterations. 相似文献
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144.
Blauner (1995, Racism and Antiracism in World Perspective. Thousand Oaks, CA: Sage), Winant (1998, Ethnic and Racial Studies 24(4): 755–766) and Bonnett (1997, New Communities 22(1): 97–110) all express concern over the construction of racism as a white-only phenomenon and the corresponding degree to which whiteness is essentialized as a negative identity. This paper explores how white antiracism activists mediate between a static construction of white racism and a more contextual understanding of racism and possibilities for white activism. While whiteness is clearly hegemonic in the larger social world, within movements for racial justice, whiteness is often seen as suspect. Given this, white antiracism activists spend a fair amount of their activist hours negotiating a problematic identity. This paper explores the mechanisms by which such an identity is negotiated. I conclude that while white activism is complicated by a definition of racism that tends to essentialize whiteness, the activists have found ways to empower themselves and to conceptualize their relationship to racism and antiracism activism in a less rigid way. All of this contributes to our understanding of the complexity of white identity and efforts to demonstrate how it is an identity that, like other identities, is always in formation. 相似文献
145.
Brown A Kitchell M O'Neill T Lockliear J Vosler A Kubek D Dale L 《Work (Reading, Mass.)》2001,16(3):219-226
OBJECTIVE: The primary objectives of this study were to identify sources of meaning for individuals within the context of a work environment, and to compare varied sources of meaning for individuals with high and low work satisfaction levels. METHOD: Participants were chosen based on satisfaction levels in employment, full-time employment status within an organization for at least one year, and diversity in the work setting. Data were gathered through a series of interviews and observations of the participants' workplaces. A comparative analysis of transcribed interviews was conducted by the researchers and with an expert occupational therapy faculty panel. From these analyses, the researchers developed work narratives for a mechanical engineer, a high school teacher, an employee of mechanical services, and a career service counselor. RESULTS: Emerging themes from the work narratives indicated that the various meanings employees found in work had an effect on their perceived levels of job satisfaction. Participants conveyed that organization identification, financial benefits, independent decision-making, reciprocal respect, opportunities for creativity, and maintaining significant relationships outside of work enhanced meaning and satisfaction. CONCLUSIONS: The worker role is a significant source of an individual's identity, meaning, and satisfaction in life. Professionals in various fields can work with employers to develop meaningful work environments for increased job satisfaction, greater motivation for work, increased productivity, and decreased employee turnover. 相似文献
146.
This article investigates how frame alignment processes are employed by a social movement organization in competitive response to a countermovement. Though the battles between feminist organizations such as NOW and conservative opposition are waged in many arenas, we focus exclusively on the ideological clash around abortion. After briefly describing the context of encounters, we examine the challenges launched against perceived threats to reproductive rights using New York State NOW chapter newsletters spanning 1970–1988. We identify three rhetorical strategies used by NOW to counterframe the debate for its members. polarization-vilification, frame debunking, and frame saving. Our findings suggest that in the face of opposition, framing strategies are modified with the goal of mobilization. 相似文献
147.
Jennifer M. Cameron MS Natalie Heidelberg MS Lisa Simmons BS Sarah B. Lyle BS Kathakali Mitra-Varma PhD Chris Correia PhD 《Journal of American college health : J of ACH》2013,61(5):499-506
Abstract Objectives, Participants, Methods: Drinking game participation has increased in popularity among college students and is associated with increased alcohol consumption and alcohol-related problems. The current study investigated drinking game participation among 133 undergraduates attending National Alcohol Screening Day (NASD) in April of 2007. Results: A large percentage of the sample reported lifetime (77%) and recent (52%) drinking game participation. Males were more likely to report recent participation and reported higher levels of consumption while playing drinking games. Drinking game participants were more likely to experience a range of alcohol-related problems, and the relationship between drinking game participation and alcohol-related problems was mediated by weekly alcohol consumption. Conclusions: These results suggest that drinking game participation is a risk factor for elevated levels of alcohol consumption and alcohol-related problems. Programs should be developed to educate students about the risks of drinking game participation, and prevention programs like NASD should address drinking games. 相似文献
148.
Trish Williams Jennifer Connolly Robert Cribbie 《Journal of research on adolescence》2008,18(1):145-172
The objectives of this research were to explore patterns of heterosexual activity in early adolescence and to examine the differential pathways to light and heavy heterosexuality. We utilized the National Longitudinal Survey of Canadian Children and Youth (NLSCY) in which heterosexual behaviors, as well as puberty, parenting processes, peer self‐concept, and problem behaviors were examined. The heterosexual activities of the majority of 12‐ and 13‐year‐old adolescents were largely confined to light activities of hugging, holding hands, and kissing. Heavy activities such as petting and sexual intercourse were reported less often. Using predictor variables from Cycle 1 of the NLSCY when participants were 10‐ and 11‐year‐olds, SEM analyses indicated that puberty and higher peer self‐concept shared significant direct pathways to both light and heavy heterosexuality. Heavy sexual activity, however, was uniquely associated with the risk factors of adolescent problem behaviors. Positive and hostile parenting styles were indirectly associated with light sexual activity through peer self‐concept. Positive and hostile parenting styles were also indirectly associated with heavy sexual activity through both peer‐oriented self‐concept and problem behaviors. Results support differential patterns and predictors of light and heavy sexuality in early adolescence. 相似文献
149.
The contributions that adult men and women make to households in terms of paid and unpaid work have undergone substantial change, particularly in respect of women's responsibility for income generation, and have been seen as part of the processes of individualization. Recent contributions to the literature have suggested that children are now acquiring independence earlier as part of those same processes. The paper uses qualitative methods to explore the way in which parents in two-parent families, where both are employed, perceive the risks attached to children's exercise of greater independence, how they seek to ‘manage’ those risks and how far the perceptions of parents accord with those of children. We find parents’ perceptions of risk to be strong, but to have little to do with working patterns. In addition, they are often at odds with the actual behaviour of the child. Risks are managed by negotiation, in which children played an active part. We are also able to make some preliminary comments on the difficulties of interpreting scale measures in relation to interview evidence. 相似文献
150.