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杂草的生物防治   总被引:1,自引:0,他引:1  
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水传粉植物     
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We examined sources of stress, burnout and intention to terminate among rugby union referees. Questionnaires were returned by 682 of 1175 referees (58%) from Wales, Scotland and England. Exploratory and confirmatory factor analyses revealed four correlated sources of stress factors (performance concerns, time pressure, interpersonal conflict and fear of physical harm), which accounted for 49.6% of the variance. Referees believed the first three factors to be mildly related to their stress. They believed fear of physical harm to be unrelated to their stress. A structural model hypothesizing that time pressure and interpersonal conflict predict burnout, and that age and burnout predict intention to terminate refereeing, fit the observed data. The goodness-of-fit index for this model was 0.96. Our results and those of other studies indicate that interpersonal conflict and time pressure are common sources of stress for sport officials and are frequently related to their burnout experiences. Also, age and burnout are frequently, although only marginally, related to intention to terminate.  相似文献   
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可持续农业     
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OBJECTIVE: To examine relationships between childhood autobiographical memory disturbance (CAMD) and adverse childhood experiences (ACEs) which are defined as common forms of child maltreatment and related traumatic stressors. METHODS: We use the ACE score (an integer count of eight different categories of ACEs) as a measure of cumulative exposure to traumatic stress during childhood. In a cross sectional analysis we assess the relationship of the ACE score to the prevalence of CAMD in a sample of 9,460 relatively healthy adults evaluated for wellness care at a southern California health maintenance organization between August 1995 and March 1996. In addition, we examined possible secular influences by examining association among each of four birth cohorts. Logistic regression was used to obtain the adjusted relative odds of CAMD associated with increasing ACE score. RESULTS: Overall, the age-standardized prevalence of CAMD was 18% (men: 15%; women: 19%). As the ACE score increased, the prevalence of CAMD increased in a graded fashion for both men and women (p for trend <.0001). After adjustment for age, sex, race/ethnicity, and education, adults with an ACE score >or=6 were 5.9 (95% CI, 4.4-7.9) times more likely to have CAMD compared to adults with an ACE score of 0. The prevalence of CAMD increased with each successive birth cohort, and graded relationships between the ACE score and CAMD were observed among each of the four birth cohorts though no statistical difference in the association was found across birth cohorts. CONCLUSIONS: The accumulation of ACEs across several domains is associated CAMD among men and women and in each of four birth cohorts. Further research is needed that describes the prevalence of CAMD in population-based samples and that examines whether impaired memory is a marker for persons neurobiologically affected by multiple forms of child maltreatment and related traumatic stressors.  相似文献   
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基因疗法     
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