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Parent-daughter transmission of the androgen receptor gene as an explanation of the effect of father absence on age of menarche 总被引：2，自引：0，他引：2
Based on an evolutionary theory of socialization, Belsky and colleagues proposed that girls exposed to a stressful environment, especially when due to father absence in the first 7 years of life, showed an early onset of puberty, precocious sexuality, and unstable relationships as adults. The authors of this article examined an alternative explanation that a variant X-linked androgen receptor (AR) gene, predisposing the father to behaviors that include family abandonment, may be passed to their daughters causing early puberty, precocious sexuality, and behavior problems. The results of a study of 121 White males and 164 White females showed a significant association of the short alleles of the GGC repeat polymorphism of the AR gene with a range of measures of aggression and impulsivity, increased number of sexual partners, sexual compulsivity, and lifetime number of sex partners in males; and paternal divorce, father absence, and early age of menarche in females. These findings support a genetic explanation of the Belsky psychosocial evolutionary hypothesis regarding the association of fathers' absence and parental stress with early age of onset of menarche and early sexual activity in their daughters. A genetic explanation of the father absence effect is proposed in which fathers carrying the AR alleles are more likely to abandon a marriage (father absence) and pass those alleles to their daughters in whom they produce an earlier age of menarche and behavioral problems. 相似文献
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Donn R. Deboard 《Learning, Media and Technology》2001,26(1):49-62
This paper uses Frank Lloyd Wright's (1867‐1959) organic architecture as a metaphor to define the relationship between a part and the whole, whether the focus is on a building and its surroundings or information delivered via hypertext. It reviews and discusses effective strategies for designing text information via hypertext and incorporates three levels of information design: the foundation, the room, and the roof level. In the foundation level, the nature of hypertext and issues concerning the use of hypertext as an appropriate information delivery technology are presented. In the room level, specifics on effective typography and content design that enhance information processing and comprehension are reviewed. In the roof level, the learner's experience performing a task and his or her identified information needs are discussed. Finally, recommendations for future research are provided 相似文献
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The problem investigated in this study was to determine if there were relationships among the leadership behaviors of training leaders, the use of newer methods of training, and organizational profitability. A sample of 57 organizations from the Fortune 500 was surveyed to determine leadership behavior and the use of newer methods of training. The Leadership Practices Inventory was used to measure leadership and the Affective Communication Test was used to measure charisma. Profitability data were obtained from the literature. Return on assets, return on equity, the Moody's Corporate Bond Rating, and the Standard and Poor's Opinion were used as profitability measures. Correlation and regression analyses were used to analyze the data. No relationships were shown between leadership behaviors and training methods or between leadership behaviors and profitability. A positive relationship was shown between the number of newer training methods used and organization profitability as measured by return on assets. 相似文献
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Summary TIMSS promises to be the educational study of the 1990s, yielding valuable data not only for curriculum developers, mathematics and science educators, and educational researchers, but also for policy-makers, and those charged with the responsibility of resource allocation. In a complex undertaking such as TIMSS the challenges are many, but the potential of such international efforts are of an equal scale. 相似文献
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ABSTRACT Technologies that enhance classroom instruction and school administration are widespread. The majority of schools, however, have yet to implement technologies beyond a basic level. Reasons for this reluctance include a lack of funds, teacher beliefs about the role of technology in education, methods of technology allocation and distribution in schools, a lack of understanding of how technologies can accentuate learning and administration, and most importantly, a lack of vision and support from school administrators. To help solve the problem of administrative support, we propose the creation of university courses designed to nourish school technology leaders. Included in this paper is a basic outline for such a course. 相似文献
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Grace L. Kirchner Donn Marshall Sunney R. Poyner 《Journal of College Student Psychotherapy》2017,31(3):192-202
This study was conducted to evaluate the impact of a protocol mandating psychological assessment of college students exhibiting specific signs of suicide risk and/or nonsuicidal self-harm. Thirty-seven current and former students who had been documented as at risk completed a structured interview in person or by phone. Outcomes suggest this protocol identifies students at risk for suicide, with 27% having made an attempt at some point in their lives and 50% having been suicidal at the time the report was written. The majority of participants endorsed the value of this intervention. 相似文献