An algebraic SU(1,1) solution for the relativistic hydrogen atom

The bound eigenfunctions and spectrum of a Dirac hydrogen atom are found taking advantage of the $SU(1, 1)$ Lie algebra in which the radial part of the problem can be expressed. For defining the algebra we need to add to the description an additional angular variable playing essentially the role of a phase. The operators spanning the algebra are used for defining ladder operators for the radial eigenfunctions of the relativistic hydrogen atom and for evaluating its energy spectrum. The status of the Johnson-Lippman operator in this algebra is also investigated.Comment: to appear in Physics Letters A (2005). We corrected a misprint in page 7, in the paragraph baggining with "With the value of ..." the ground state should be |\lambda, \lambda>, not |\lambda, \lambda+1

Ley penal mexicana y víctimas colaterales

[ES] Este artículo demuestra la necesidad de una nueva teoría de la argumentación jurídica en materia penal. Reseña la historia del Código Penal Federal mexicano. Hace la diferencia entre ciencia jurídica y ley penal. A la ciencia jurídico-penal no se le puede observar sólo como argumentación, sino que es necesario juzgar y argumentar otorgando más importancia a la interpretación crítica a la luz de la moderna hermenéutica.[EU] Artikulu honek zigor-arloan argudio jurdiko berri baten beharra azaltzen du. Mexikar Zigor-Kode Federalaren historioa azaltzen du. Lege Penala eta Zientzia Juridikoaren arteko desbertintasuna egiten du. Zientzia Jurdiko eta Penala ezin daiteke argudio bezala soilik aztertu, baizik eta egungo hermeneutika kontuan harturik, beharrezkoa da epaitu eta argudiatu interpretazio kritikoari garrantzi handiagoa emanez.[FR] Cet article montre la nécessité d’une nouvelle théorie de l’argumentation juridique en matière pénale. L’auteur raconte l’histoire du Code Pénal Fédéral mexicain, en faisant la différence entre la science juridique et la Loi pénale. Il ne faut pas observer la science juridique pénale seulement comme une argumentation, mais il est nécessaire de juger et d’argumenter en attribuant plus d’importance à l’interprétation critique d’après le point de vue de la herméneutique moderne.[EN] This article shows the need for a new theory of juridical argumentation in criminal matters. It gives an account on the history of the Mexican Federal Penal Code. It also differentiates juridical science from criminal law. Criminal science cannot be seen only as argumentation, it is necessary to judge and argue giving more importance to the critical interpretation in the light of modern hermeneutics

Derechos humanos y juicios orales. Yuxtaposición del proceso penal y una sociedad perversa

[ES] Ante un problema pragmático –transformar el proceso penal moderno en proceso restaurativo–, el presente artículo aborda un problema cognitivo, ¿Cómo formar conciencia entre los habitantes de México de que los juicios orales necesitan avanzar en el sentido de los Derechos Humanos? Dicha aporía se origina con la Reforma a la Constitución Política de México, en materia de Justicia Penal, Seguridad Pública y Delincuencia Organizada, promulgada el 18 de junio de 2008, la cual junta el proceso penal moderno y una sociedad perversa.[EU] Arazo pragmatiko baten aurrean –prozesu penal modernoa prozesu berrezartzaile bihurtzea–, egileak honako arazo kognitibo honi heltzen dio: nola sortu kontzientzia Mexikoko biztanleen artean ahozko epaiketak giza eskubideen alorrean aurrera jotzeko beharraz? Aporia horrek Justizia Penalaren, Segurtasun Publikoaren eta Delinkuentzia Antolatuaren arloan egindako Mexikoko Konstituzio Politikoaren Erreforman du jatorria, zeina 2008ko ekainaren 28an promulgatu zuten, eta prozesu penal modernoa eta gizarte makur bat elkartzen ditu.[FR] Devant un problème pragmatique –transformation du procès pénal moderne en procès restauratif–, l’article traite d’un problème cognitif: comment développer la conscience entre la population du Mexique en ce qui concerne la nécessité d’avancer en matière des droits de l’homme au sein des audiences? Cette aporie trouve son origine dans la Réforme de la Constitution Politique du Mexique, en matière de Justice Pénale, Sécurité Publique et Délinquance Organisée, promulguée le 18 juin 2008, laquelle met en rapport le procès pénal moderne avec une société perverse.[EN] Faced with a pragmatic problem –transforming the modern criminal justice process into a restorative process–, the present article deals with a cognitive problem: how can we raise awareness among Mexico’s inhabitants about the need for oral trials to develop towards Human Rights? Such an aporia originates from the Reform of the Political Constitution of Mexico, in terms of Criminal Justice, Public Security and Organized Crime, enacted on June 18, 2008, which puts together the modern criminal justice process and a perverse society

Pedagogy in diverse secondary school classes: Legacies for higher education

As university teachers we find ourselves grappling with the increasingly diverse legacies of students’ prior pedagogic experiences – some of which seem to work against the quality intellectual outcomes now demanded from higher education. In this context, this paper reports a descriptive study of pedagogy created for Chinese students in a mainstream Australian secondary school with a high level of tertiary entry. An influential literature on student learning in higher education has pointed to the constraining effects of bothWestern and Chinese secondary schooling on university students’ learning. In the case of Chinese students who enter Western universities from Western secondary schools, the picture is complicated by research indicating that students of English as a Second Language (ESL) receive even more constraining forms of pedagogy than their native-English-speaking peers. A framework of Bernsteinian sociological concepts and discourse analytic concepts was employed in the study reported here to explore this possibility. Implications are drawn for managing the transition of ESL students to university contexts, and for reflecting on our own responses to linguistic and cultural diversity in the tutorial room

Anaerobic 4-hydroxyproline utilization: Discovery of a new glycyl radical enzyme in the human gut microbiome uncovers a widespread microbial metabolic activity.

The discovery of enzymes responsible for previously unappreciated microbial metabolic pathways furthers our understanding of host-microbe and microbe-microbe interactions. We recently identified and characterized a new gut microbial glycyl radical enzyme (GRE) responsible for anaerobic metabolism of trans-4-hydroxy-l-proline (Hyp). Hyp dehydratase (HypD) catalyzes the removal of water from Hyp to generate Δ1-pyrroline-5-carboxylate (P5C). This enzyme is encoded in the genomes of a diverse set of gut anaerobes and is prevalent and abundant in healthy human stool metagenomes. Here, we discuss the roles HypD may play in different microbial metabolic pathways as well as the potential implications of this activity for colonization resistance and pathogenesis within the human gut. Finally, we present evidence of anaerobic Hyp metabolism in sediments through enrichment culturing of Hyp-degrading bacteria, highlighting the wide distribution of this pathway in anoxic environments beyond the human gut

Fibrosis intersticial pulmonar idiopática en el West Highland White Terrier

El siguiente trabajo revisa las características clínicas y el protocolo diagnóstico de la fibrosis intersticial pulmonar idiopática en el West Highland White Terrier. A su vez, se ofrece una revisión de los trabajos publicados sobre esta frustrante enfermedad de etiología desconocida. Finalmente, se revisan las opciones terapéuticas y el pronóstico de la enfermedad

The Exemption Status of the Bona Fide Pledgee of Unregistered Securities Under the Securities Act of 1933

The number of connections of photovoltaic (PV) to distribution network is increasing. Very few PV connection guidelines that distribution system operators (DSOs) can refer to have been found. This paper deals with network planning guidelines for distribution networks with PV. The paper aims to identify planning rules that are relatively easy to implement.QC 20140625</p

Existence and Uniqueness of Solutions to a Nonlocal Equation with Monostable Nonlinearity

Let $J \in C(\mathbb{R})$, $J\ge 0$, \int_{\tiny\mathbb{R}} J = 1 and consider the nonlocal diffusion operator $\mathcal{M}[u] = J \star u - u$. We study the equation $\mathcal{M} u + f(x,u) = 0$, $u \ge 0$, in $\mathbb{R}$, where $f$ is a KPP-type nonlinearity, periodic in $x$. We show that the principal eigenvalue of the linearization around zero is well defined and that a nontrivial solution of the nonlinear problem exists if and only if this eigenvalue is negative. We prove that if, additionally, $J$ is symmetric, then the nontrivial solution is unique