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Changes in the rates of utilization of dissolved compounds during the period of visceral mass regeneration were examined in the crinoid Cenometra bella (Hartlaub). Rates of respiraton and incorporation of labelled amino acids increase, reaching a maximum 2 d after evisceration and returning to normal after 14 d. Rates of incorporation of radioisotope into the organic components of the arms and cirri decrease, while incorporation rate into the visceral mass increases. Incorporation rates of amino acid-derived radioactivity into skeletal carbonate and the ash-free dry weight:protein ratio of arms, cirri and oral disc decrease, reaching a minimum 2 d following evisceration. 相似文献
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Kate Millar Erik Thorstensen Sandy Tomkins Ben Mepham Matthias Kaiser 《Journal of Agricultural and Environmental Ethics》2007,20(1):53-63
A number of EU institutions and government committees across Europe have expressed interest in developing methods and decision-support
tools to facilitate consideration of the ethical dimensions of biotechnology assessment. As part of the work conducted in
the EC supported project on ethical tools (Ethical Bio-TA Tools), a number of ethical frameworks with the potential to support
the work of public policy decision-makers has been characterized and evaluated. One of these potential tools is the Delphi
method. The Delphi method was originally developed to assess variables that are intangible and/or shrouded in uncertainty
by drawing on the knowledge and abilities of a diverse group of experts through a form of anonymous and iterative consultation.
The method has hitherto been used by a diversity of practitioners to explore issues such as technology assessment, environmental
planning, and public health measures. From the original (classical) Delphi, a family of Delphi-related processes has emerged.
As a result of the evaluation of the various Delphi processes, it is proposed that the classical method can be further developed
and applied as a form of ethical framework to assist policy-makers. Through a series of exercises and trials, an Ethical Delphi
has been developed as a potential approach for characterizing ethical issues raised by the use of novel biotechnologies. Advantages
and disadvantages of the method are discussed. Further work is needed to develop the procedural aspects of the Ethical Delphi
method and to test its use in different cultural contexts. However, utilizing an ethical framework of this type combines the
advantages of a methodical approach to capture ethical aspects with the democratic virtues of transparency and openness to
criticism. Ethical frameworks such as the Ethical Delphi should contribute to better understanding of and decision-making
on issues that involve decisive ethical dimensions. 相似文献
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