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Early non-invasive fetal sexing is widely available over the Internet, leading to concerns about its possible use for sex selection. The aim of this review is to summarise the results of surveys describing lay attitudes towards sex selection for non-medical reasons to help address or inform such concerns. A search of electronic databases and key journals was supplemented by an Internet search and citation-tracking. Twenty-one quantitative studies were identified. Most were conducted in the US, with five recent studies in the UK and Germany. Most studies found that, overall, people were not in favour of sex selection. However, this varied from 94 to 18%. People may hold more negative attitudes when the method of sex selection is specified, particularly if this involves termination of pregnancy (TOP). Attitudes towards the general availability of sex selection are less negative than those towards personal use. Attitudes were consistently negative in German surveys. Little is known of such attitudes outside the US, the UK and Germany, and how such attitudes may change as new sex selection technologies become available. Studies of use of early non-invasive fetal sexing for sex selection for non-medical reasons are needed to assess the extent to which concerns about usage are justified and to assist in debates on how these might be most appropriately addressed. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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针对粉粒状物料在散装发送过程中 ,容易引起粉尘飞扬的问题 ,利用现代脉动跟踪技术和表面过滤技术 ,设计研制的除尘系统 ,始终将吸尘罩与料堆扬尘点的动态相对位置控制在合理的范围内 ,实现了粉粒状物流连续自动的、环保高效作用 相似文献
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含半无限长裂纹压电材料的Ⅲ型强度因子 总被引:2,自引:0,他引:2
研究了含半无限长裂纹压电材料在平面内电场和反平面荷载作用下的问题 ,得到了满足拉普拉斯方程、裂纹面边界条件的位移函数解和电势函数解及电弹场的基本解 ,并得到了应力、应变、电位移强度因子和能量释放率。研究结果表明 ,在裂尖 ,电场强度没有奇异性 ,而应变、应力、电位移具有奇异性。 相似文献
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就目前电厂循环流化床锅炉运行中存在的床温波动问题,讨论了导致床温波动的因素,并针对性地提出了控制床温的一些措施。 相似文献
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高炉料仓环境条件恶劣,而高炉生产又要掌握料位情况。比较了2种料位计,最终选择了SA—2型料位计。 相似文献
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We present a hitherto unknown prey perception strategy in bats: Myotis nattereri (Vespertilionidae, Chiroptera) is able to perceive prey by echolocation within a few centimeters of echo-cluttering vegetation,
by using frequency-modulated search signals of very large bandwidth (up to 135 kHz). We describe the species’ search behavior
and echolocation repertoire from the field and from experiments in a flight tent. In the field, bats varied signal parameters
in relation to their distance from vegetation and usually flew close to vegetation. In the flight tent, M. nattereri detected and localized prey by echolocation alone as close as 5 cm from vegetation. Apparently, the bats were able to tolerate
some overlap between prey and clutter echoes. Passive prey cues (vision, olfaction, prey-generated sounds) were not used in
prey perception. The bats selected prey by size. The animals performed aerial catches and produced approach sequences typical
for aerial hawking bats, but were able to do so within a few centimeters of the substrate. M. nattereri thus has access to silent, suspended prey very close to vegetation (e.g., spiders, and caterpillars on threads).
Received: 29 September 1999 / Received in revised form: 12 February 2000 / Accepted: 12 February 2000 相似文献