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Onora O'Neill 《黑龙江环境通报》2006,26(7):646-647
Hitherto sex selection could be achieved only by destroying any fetus or child of the unwanted sex. Sperm selection may change that. The technology could be used to ‘balance’ families. However its use in certain developing countries might ‘unbalance’ populations, with serious, if unintended, consequences. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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Wolfgang Fennel Thomas Neumann 《Ambio-人类环境杂志》2001,30(4):232-236
海洋生态系统的动力问题,如可观测的化学-生物量的时空变化是由于生物和物理过程决定的.预报海洋系统的未来发展需要有一个理论框架.如模型,而这个模型是根据对相关的各个不同过程的研究和了解而发展的.从理论上描述海洋系统的自然方法似乎是把化学生物模型与环境模型结合在一起.但是,环境模型相对比较先进,而化学-生物过程的定量理论描述比较落后.本文讨论了一些关于发展相容理论的方法和问题,指出了海洋生物学模型和海洋学模型耦合的潜在盖处. 相似文献
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海洋生态系统的动力问题,如可观测的化学-生物量的时空变化是由于生物和物理过程决定的.预报海洋系统的未来发展需要有一个理论框架.如模型,而这个模型是根据对相关的各个不同过程的研究和了解而发展的.从理论上描述海洋系统的自然方法似乎是把化学生物模型与环境模型结合在一起.但是,环境模型相对比较先进,而化学-生物过程的定量理论描述比较落后.本文讨论了一些关于发展相容理论的方法和问题,指出了海洋生物学模型和海洋学模型耦合的潜在盖处. 相似文献
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佛山市金舵陶瓷有限公司是一家集科、工、贸;产、供、销于一体的大型知名陶瓷企业.公司始建于1993年,经过14年的发展,已经发展成为国内著名的大型优质高档建陶生产企业之一.公司是最早大规模采用进口设备生产抛光砖的企业,也因此享有"中国抛光砖鼻祖"的美誉. 相似文献
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Early research showed that citizens’ environmental concern in the United States was linked to three individual-level factors: socio-demographic variables, political orientations, and personal beliefs or worldviews about human-nature relations. Given many changes in the American society over the last several decades, one important, yet unanswered question is whether these factors still drive public environmental concern in the United States today, and if so, to what extent. This study, drawing from extant theoretical and empirical studies, aims to reinvestigate the determinants of citizens’ environmental concern by employing three national public surveys conducted in 2004, 2007, and 2013. Our data analyses confirm and expand the findings of previous research on the significance and importance of political ideology, fundamental beliefs about human-nature relations, and certain socioeconomic factors such as gender and race in explaining citizens’ environmental concern. More specifically, political liberals, people with higher New Ecological Paradigm values, females, and Non-Whites tend to be more concerned about environmental problems than their counterparts are. Our data analyses also reveal some interesting findings when compared to many previous studies: first, our data indicate a positive relationship between age and environmental concern, suggesting that older people in the United States are more concerned about the environment than younger adults; second, unlike most past research showing a positive Education-Environmental Concern relationship, our study suggests that education level seems to have little effect in explaining citizens’ environmental concern measured in this study. Key implications for environmental policymaking and recommendations for future research are discussed in the conclusion. 相似文献
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环境保护是我国的一项基本国策,环境教育也是素质教育的重要内容。通过对中学生进行环境教育,培训学生环保意识和环保技能,提高学生素质。 相似文献
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电影《无极》剧组污染香格里拉的行为一时间弄得沸沸扬扬。这不仅仅是老百姓对公众人物社会责任感的质疑,更是我们这个社会公众环境意识和参与意识有了空前的提高。我认为这也是一个国家文明程度的体现。 相似文献
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作为一家专业环保投资企业,中国光大国际有限公司在短短一段时间内,在国内环保产业市场的一系列运作令业界刮目相看.本刊记者近期电话连线该公司工程总监张洪波. 相似文献
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W. A. Müller 《Die Naturwissenschaften》1999,86(10):457-467
MyoD/myogenin genes and neural key genes (e.g., achaete scute-C, neurogenin), are switched on which control entire sets of subordinate effector genes. In multiplying cells "cell heredity" based on
an epigenetic cellular memory enables transmission of the cell type determining program from parental to daughter cells. This
memory can be based on autocatalytic self-activation of cell type specific selector genes and on the enduring action of gene
groups such as the Polycomb and thrithorax complexes that code for proteins which bind to DNA sequences called cellular memory modules. These modules confer permanent
accessibility (potentiation) or inaccessibility (silencing) upon many different gene loci on the chromosomes. 相似文献
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分子生物学在渔业环境保护中的运用 总被引:3,自引:0,他引:3
分子生物学理论和技术在渔业环境保护与监测工作中的应用越来越得到人们的重视:生物体的多种酶已被用作监测水环境污染的指标;金属硫蛋白等生物体解毒体系在监测和防治水体重金属污染方面发挥显著作用;核酸是生物体遗传信息载体,以核酸质量变化监测水环境污染已取得较好的效果。据此就分子生物学在今后渔业环境保护中的运用提出了观点。 相似文献