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Tradable-permit schemes are becoming an increasingly popular technique for encouraging materials recovery and the diversion of waste from landfill. Such schemes operate using various forms of market-based trading of waste permits between polluters but usually rely on mandatory recycling targets to provide an incentive for trading. Using the UK's Packaging Recovery Note (PRN) scheme as a template, this paper examines the potential for permit trading where mandatory targets are absent and schemes must be driven solely by the financial benefits of reduced landfill costs and permit/material sales. The case examined is sterilized clinical waste, which has considerable recycling potential but suffers from health concerns and a poor public image. Interviews with healthcare and waste-management representatives indicate that although elements of the PRN scheme might prove appropriate for encouraging materials recovery, the absence of government targets and uncertain end markets for sterilized clinical waste present major obstacles to trading. Alternative incentives would therefore be required to catalyse schemes and develop recycling infrastructure. In the final analysis, thermal processing may be a more practical alternative to landfill than materials recovery for this particular waste stream. 相似文献
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Bertrand Segues Jean-Michel Rozet Brigitte Gilbert Pascale Saugier-Veber Daniel Rabier Jean-Marie Saudubray Mireille Carré Françoise Parrot Rouleau Alain Menget Jean-Michel Bonardi Stanislas Lyonnet Jean-Paul Bonnefont Arnold Munnich 《黑龙江环境通报》1995,15(8):757-761
Ornithine transcarbamylase (OTC) deficiency is an X-linked disorder of the urea cycle mapped to chromosome Xp21.1. Here, we show that apparent segregation of null alleles at the OTC locus and flanking polymorphic loci mimicked false maternity or false paternity in three affected families. Based on these observations, we suggest giving consideration to gene deletion when dealing with segregation of null alleles in OTC deficiency. 相似文献
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Colonies and isolated bees of the Cape honeybee, Apis mellifera capensis Esch., were observed for evidence of circadian rhythmicity under constant conditions. It was found that colonies develop free-running activity rhythms in self-selected light-dark cycles, which are slightly shorter than 24 h. The periods of the activity rhythms of individual isolated bees were longer than 24 h in self-selected light-dark and constant light, while they were shorter than 24 h in constant darkness. A greater variability in period was found in the isolated bees than in the colonies. When the rhythms of colonies and individual bees from these colonies were measured simultaneously, the activities of the isolated bees drifted with respect to that of the colonies, their period being either longer or shorter than that of their own colony. After 12 days of isolation of individual bees from their colony, all coincidence between the phases of the two rhythms was lost. We conclude that the periods of common activity and common rest of the bees within a colony result from a mutual (social) synchronization of the rhythms of the individual bees. 相似文献
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Francesca Romana Grati Denise Molina Gomes Jose Carlos Pinto B. Ferreira Celine Dupont Viola Alesi Laetitia Gouas Nina Horelli-Kuitunen Kwong Wai Choy Sandra García-Herrero Alberto Gonzalez de la Vega Krzysztof Piotrowski Rita Genesio Gloria Queipo Barbara Malvestiti Bérénice Hervé Brigitte Benzacken Antonio Novelli Philippe Vago Kirsi Piippo Tak Yeung Leung Federico Maggi Thibault Quibel Anne Claude Tabet Giuseppe Simoni François Vialard 《黑龙江环境通报》2015,35(8):801-809
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