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排序方式： 共有1198条查询结果，搜索用时 15 毫秒
941.
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现代农业生物技术对中国未来经济和全球贸易的影响 总被引：7，自引：0，他引：7
一场有关中国是否应该继续加速推进其转基因生物技术和是否应将转
基因粮食作物商业化的争论正在激烈地进行，这一争论对现代生物技术在中国的应用产生了
影响。本文根据转基因棉花商业化的调查数据和转基因水稻的田间实验数据，在分析不同情
况下采用转基因农作物对中国和其他国家和地区的生产、贸易和福利影响的基础上，对转基
因棉花和水稻的影响进行了全面的经济评估。在此基础上提出了中国发展生物技术的政策建
议。 相似文献
943.
Ethnicity as a moderator of the theory of planned behavior and physical activity in college students
Blanchard CM Kupperman J Sparling P Nehl E Rhodes RE Courneya KS Baker F Hunt T 《Research quarterly for exercise and sport》2007,78(5):531-541
Most college students do not meet physical activity (PA) guidelines, and ethnic disparities exist. The present study examined the utility of the theory of planned behavior (TPB) in explaining PA intentions and behavior in black and white college students and whether any TPB relationships were moderated by ethnicity. Black (n=170) and white (n=180) students completed a baseline TPB questionnaire and PA assessment 2 weeks later Hierarchical latent variable regression analyses showed that affective attitude, subjective norm, and perceived behavioral control (PBC) were significant predictors of intention for both ethnic groups, whereas the PBC-intention relationship was significantly stronger for white students. Intention significantly predicted PA for both ethnic groups. Furthermore, common and ethnic-specific beliefs were identified. 相似文献
944.
Verheyden B Eijnde BO Beckers F Vanhees L Aubert AE 《Journal of sports sciences》2006,24(11):1137-1147
The purpose of this study was to evaluate the effects of a realistic, feasible, and commonly used fitness training programme on cardiac autonomic control in 14 sedentary men aged 62.0 +/- 6.1 years (mean +/- s). All participants performed a one-year fitness training programme in which training intensity and frequency were specifically chosen to be compliant for the majority of the participants (2-3 sessions per week at moderate intensity). At the same time, a reference group consisting of 15 sedentary age-matched men (age 64.2 +/- 6.5 years) did not change their habitual physical activity. Measurements were performed before and after the training intervention. Cardiac autonomic control was inferred from resting values (supine and standing) of heart rate variability (HRV) computed in the frequency domain over 10-min intervals. Endurance capacity was evaluated during a maximal incremental bicycle ergometer test. In spite of an increase in peak oxygen consumption (VO2peak) by 6.4% after training, heart rate in the training group remained unchanged at rest and at the same metabolic demand. No changes in resting parameters of HRV were shown for either groups or positions. Results from this study provide no evidence of a clinically meaningful increase in the vagal modulation to the sinus node at rest after one year of low-volume and moderate-intensity fitness training in men aged 55-75 years. 相似文献
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