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Prevailing Assumption (prevailing + assumption)
Selected AbstractsWhen do the Costs of Spermatogenesis Constrain Sperm Expenditure?ETHOLOGY, Issue 1 2009Remarks on the Pattern of the Spermatogenic Cycle The costs of spermatogenesis constrain sperm expenditure when sperm production per day is limited. Thus, males are challenged to allocate available resources to sperm production and other life history functions. However, this prevailing assumption is not applicable to species in which spermatogenesis becomes quiescent during the breeding season. Males of these species prepare large quantities of sperm before the breeding season. Among these species, constraints on ejaculates have been intensively investigated in salamanders that deposit spermatophores. Although it is predicted that sperm expenditure should not be limited because of abundantly prepared sperm, spermatophore deposition is often limited during the breeding season when vas deferens are full of sperm. We tested a hypothesis regarding limited spermatophore deposition by measuring sperm quantity and volume of spermatophores sequentially deposited by male eastern newts Notophthalmus viridescens. A male newt rarely deposits more than three spermatophores per mating. If depletion of non-sperm components of spermatophores limits spermatophore deposition, we predicted that spermatophore volume decreases while sperm quantity remains constant as a male deposits more spermatophores. Alternatively, some regulative mechanisms allow a limited portion of available sperm to be expended per mating, in which sperm quantity is predicted to decrease while the spermatophore volume remains constant. Finally, depletion of non-sperm components may regulate sperm expenditure, which predicted that both spermatophore volume and sperm quantity decrease. We found that both sperm quantity and the spermatophore volume decreased as a male deposited more spermatophores during a single mating. Sperm expenditure was constrained without the costs involved in active spermatogenesis, and depletion of non-sperm components likely regulate sperm quantity loaded in spermatophores. In dissociated spermatogenesis, constrained sperm expenditure do not mean that costly spermatogenesis is directly limiting male mating capacity but rather suggest that the evolution of physiological mechanisms regulating sperm expenditure per mating maximizes male reproductive success. [source] "Staged" Rituals and "Veiled" SpellsJOURNAL OF LINGUISTIC ANTHROPOLOGY, Issue 1 2006Yoonhee Kang This article analyzes shifting forms and meanings of two Petalangan traditional genres of verbal magic, a public healing ritual and a genre of personal magical spells, in the context of the Petalangan social marginalization. To explain why and how these two genres have changed differently, this article focuses on the roles of two different language ideologies, the referentialist and performativist views of language, in the mediation between the linguistic and social changes in Petalangan society. Against the prevailing assumption of a linear transition of language ideologies from the performativist to the referentialist view of language in accordance with social modernization, the transformations in the Petalangan magical genres reveal a multifaceted process of change in which multiple language ideologies have worked differently across the genres and contexts. [source] Re-estimating the difficulty of closing the digital divideJOURNAL OF THE AMERICAN SOCIETY FOR INFORMATION SCIENCE AND TECHNOLOGY, Issue 12 2008Jeffrey James While we now know the most important determinants of the digital divide, such as income, skills, and infrastructure, little has been written about how these variables relate to one another. Yet, it is on the basis of one's answer to this question that the difficulty of closing the divide ultimately depends. In this article, I have sought to challenge the (implicit) prevailing assumption in most of the digital-preparedness literature that variables can be perfectly substituted for one another and, hence, added together. In particular, and drawing on available evidence, I view the relationship between, say computers and computer skills, as being nearer the opposite extreme, of totally limited substitutability. On this basis, I suggest that the components of digital-preparedness indexes be multiplied rather than added. Using multiplication rather than addition in most current indexes of digital preparedness reveals a substantial understatement of the real difficulty in closing the digital divide and a different set of policies to deal with this larger problem. Such policies should include sharing arrangements and the use of intermediaries. [source] A-Legality: Postnationalism and the Question of Legal BoundariesTHE MODERN LAW REVIEW, Issue 1 2010Hans Lindahl This paper critically examines the prevailing assumption that legal boundaries are becoming irrelevant in postnationalism. While the boundaries of the nation-state are forfeiting some of their hold on human behaviour, postnational legal orders are simply not legal orders unless they can in some way draw the spatial, temporal, material and subjective boundaries that make it possible to qualify human behaviour as legal or illegal. This implies that reflexively constituted legal orders , whether national or postnational , must be presented as legal unities. To the extent that boundaries are the necessary condition of national and postnational legal orders, and therewith of legal unity, they also spawn the possibility of political plurality, manifested in behaviour that resists the very distinction between legality and illegality, as drawn by an order of positive law: a-legality. Rather than signalling the demise of legal boundaries, postnationalism ushers in a novel way of dealing therewith , and with a-legality. [source] RESPONSIBILITY FOR CONTROL; ETHICS OF PATIENT PREPARATION FOR SELF-MANAGEMENT OF CHRONIC DISEASEBIOETHICS, Issue 5 2007BARBARA K. REDMAN ABSTRACT Patient self-management (SM) of chronic disease is an evolving movement, with some forms documented as yielding important outcomes. Potential benefits from proper preparation and maintenance of patient SM skills include quality care tailored to the patient's preferences and life goals, and increase in skills in problem solving, confidence and success, generalizable to other parts of the patient's life. Four central ethical issues can be identified: 1) insufficient patient/family access to preparation that will optimize their competence to SM without harm to themselves, 2) lack of acknowledgement that an ethos of patient empowerment can mask transfer of responsibility beyond patient/family competency to handle that responsibility, 3) prevailing assumptions that preparation for SM cannot result in harm and that its main purpose is to deliver physician instructions, and 4) lack of standards for patient selection, which has the potential to exclude individuals who could benefit from learning to SM. Technology assessment offers one framework through which to examine available data about efficacy of patient SM and to answer the central question of what conditions must be put in place to optimize the benefits of SM while assuring that potential harms are controlled. [source] | ||||||||||