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Negative physical and verbal interactions occurring between early adolescents and their closest-spaced sibling were examined. Two hundred forty-four junior high school students provided information concerning their experiences as victims and perpetrators of aggressive and agonistic behaviors. Results confirm earlier studies' findings that siblings engage in numerous hostile interactions and that females and males perform these behaviors to an almost equal extent. Participants' self-reports suggest that parents may underestimate sibling use of physical force to resolve conflicts. Findings indicate there is further need to examine sibling interactions in order to better understand family functioning and family violence.  相似文献   
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The identification of ABH antigens from compact bone tissue is known from many sources. The purpose of this study was to make a contribution to the localization of blood-group-active substances in compact bone tissue. A variety of preparation and identification methods were successfully used and compared. Samples were extracted from compact bone tissue, separated by HPTLC, and examined using the absorption-elution and PAP techniques. Additionally, the PAP technique was carried out on cryostat sections. Serologically active blood-group substances were consistently demonstrated in the organic components of the haversian canals.  相似文献   
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The broader context of relational aggression in adolescent romantic relationships was assessed by considering the ways such aggression emerged from prior experiences of peer pressure and was linked to concurrent difficulties in psychosocial functioning. Longitudinal, multi-reporter data were obtained from 97 adolescents and their best friends at age 15 and from adolescents and their romantic partners at age 18. Teens’ relational aggression and romantic partners’ victimization were predicted from levels of best friends’ pressuring behaviors toward teens in an observed interaction as well as from best friends’ ratings of how much pressure teens experienced from their peer group. Romantic partner relational aggression and teen victimization were predicted by pressure from teens’ peer group only. Adolescents’ romantic relational aggression and victimization were also associated with elevated levels of depressive symptoms and increased alcohol use. Results are discussed in terms of the connection of relational aggression in romantic relationships to the broader task of establishing autonomy with peers in psychosocial development.
Megan M. SchadEmail:
  相似文献   
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Participants (n = 36) with consistent Pre-conformist ego development levels during multiple adolescent assessments were studied to determine whether and how their ego levels had changed at age 25. Those (n = 12) whose ego levels remained at the Pre-conformist level were assigned to a life-course-persistent profound ego development arrest trajectory group; those (n = 24) whose ego levels reached the Conformist or Post-conformist level at age 25 were assigned to an adolescence-limited profound ego development arrest trajectory group. Analysis of predictors and age 25 correlates of group membership revealed that selected age 14 family interaction behaviors differentiated the two groups. At age 25, members of the adolescence-limited group showed superior performance on several measures of interpersonal and intrapersonal functioning.
Stuart T. HauserEmail:
  相似文献   
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Megan Mullin Department of Political Science, Temple University, 408 Gladfelter Hall (025-22), 1115 West Berks Street, Philadelphia, PA 19122-6089 e-mail: mmullin{at}temple.edu (corresponding author) Would holding elections by mail increase voter turnout? Manyelectoral reform advocates predict that mail ballot electionswill boost participation, basing their prediction on the highturnout rate among absentee voters and on the rise in voterturnout after Oregon switched to voting by mail. However, selectionproblems inherent to studies of absentee voters and Oregon giveus important reasons to doubt whether their results would extendto more general applications of voting by mail. In this paper,we isolate the effects of voting in mail ballot elections bytaking advantage of a natural experiment in which voters areassigned in a nearly random process to cast their ballots bymail. We use matching methods to ensure that, in our analysis,the demographic characteristics of these voters mirror thoseof polling-place voters who take part in the same elections.Drawing on data from a large sample of California counties intwo general elections, we find that voting by mail does notdeliver on the promise of greater participation in general elections.In fact, voters who are assigned to vote by mail turn out atlower rates than those who are sent to a polling place. Analysisof a sample of local special elections, by contrast, indicatesthat voting by mail can increase turnout in these otherwiselow-participation contests. Authors' note: We are grateful to the Haynes Foundation forsupporting this project, Karin MacDonald for bringing mail ballotprecincts to our attention, Anup Pradhan for providing criticaldata, Shawn Treier for his helpful comments on an earlier draft,and Sam Deddeh and Mike Binder for data entry assistance.  相似文献   
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