80 research outputs found
Semileptonic decay constants of octet baryons in the chiral quark-soliton model
Based on the recent study of the magnetic moments and axial constants within
the framework of the chiral quark-soliton model, we investigate the baryon
semileptonic decay constants and . Employing the
relations between the diagonal transition matrix elements and off-diagonal ones
in the vector and axial-vector channels, we obtain the ratios of baryon
semileptonic decay constants and . The ratio is also
discussed and found that the value predicted by the present model naturally
lies between that of the Skyrme model and that of the nonrelativistic quark
model. The singlet axial constant can be expressed in terms of the
ratio and in the present model and turns out to be small. The
results are compared with available experimental data and found to be in good
agreement with them. In addition, the induced pseudotensor coupling constants
are calculated, the SU(3) symmetry breaking being considered. The
results indicate that the effect of SU(3) symmetry breaking might play an
important role for some decay modes in hyperon semileptonic decay.Comment: 16 pages, RevTeX is used. No figure. Accepted for publication in
Phys. Rev.
Size Doesn't Matter: Towards a More Inclusive Philosophy of Biology
notes: As the primary author, O’Malley drafted the paper, and gathered and analysed data (scientific papers and talks). Conceptual analysis was conducted by both authors.publication-status: Publishedtypes: ArticlePhilosophers of biology, along with everyone else, generally perceive life to fall into two broad categories, the microbes and macrobes, and then pay most of their attention to the latter. ‘Macrobe’ is the word we propose for larger life forms, and we use it as part of an argument for microbial equality. We suggest that taking more notice of microbes – the dominant life form on the planet, both now and throughout evolutionary history – will transform some of the philosophy of biology’s standard ideas on ontology, evolution, taxonomy and biodiversity. We set out a number of recent developments in microbiology – including biofilm formation, chemotaxis, quorum sensing and gene transfer – that highlight microbial capacities for cooperation and communication and break down conventional thinking that microbes are solely or primarily single-celled organisms. These insights also bring new perspectives to the levels of selection debate, as well as to discussions of the evolution and nature of multicellularity, and to neo-Darwinian understandings of evolutionary mechanisms. We show how these revisions lead to further complications for microbial classification and the philosophies of systematics and biodiversity. Incorporating microbial insights into the philosophy of biology will challenge many of its assumptions, but also give greater scope and depth to its investigations
Avaliação cintilográfica de diferentes dosagens de Tecnécio-99m na padronização da perfusão pulmonar em cães da raça Rottweiller
Power Hierarchies and Social Status: On the Normative Significance of Social Epidemiology
Nozick Revisited: The Formation of the Right-Based Dimension of his Political Theory
Nozick’s Anarchy, State, and Utopia is still infl uential today among right-wing (neo-)libertarian thinkers. The latter are engaged in the current debate on distributive justice, insistently defending the minimal state and the case against social justice on the grounds of inviolable individual rights. The premises of their defense are explicitly derived from Anarchy, State, and Utopia. Therefore, if one is interested in challenging the right-wing libertarian arguments today, one should be interested in revisiting Nozick, refuting the key elements of his theory. That is what this article does: it re-examines the formation of the moral dimension of Nozick’s political theory. It argues that this dimension consists of the idea of absolute individual rights and is formed upon the premises of full self-ownership and the moral inviolability of persons. Both premises are problematical because they are abstracted from any epistemological principle of self-realization
Fixed and flexible dosing of pregabalin for postherpetic neuralgia: Comparing tolerability and onset of pain relief
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