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Search Results: 1 - 10 of 273938 matches for " Bruno P. W.; "
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Going home in peace: the economy of virtues, and apathy as a right
Reis,Bruno P. W.;
Brazilian Political Science Review (Online) , 2007,
Abstract: this article proceeds from the premise that, even if you accept the principle that justice is impossible in the complete absence of virtue, a good political system ought to be parsimonious in any requirement of virtue as an input, so as not to impose undue restrictions on its own ability to function. assuming a more or less random distribution of virtue through time and space, it would be preferable, all other things being equal, to have a system equipped to operate not only in periods of abundant moral and ethical virtue, but also - and particularly - in periods of scarcity, when such qualities seem depleted in human nature. this exigency grows critical in the context of a modern society, in which the ever-increasing complexity and impersonal nature of social relations will produce anonymity that would urge extreme caution in the presumption of virtue as an element of social relations - a caution that sociology unanimously teaches us. in such a context - one in which not all issues will involve everyone equally, nor will all voices be always audible - prudence advises and tolerance demands that political apathy - or, rather, mere abstention - should be recognized, if not as a new modality of virtue, at least as a basic right: in the exercise of which, i will respectfully silence myself whenever appropriate before the judgment of actors more intensely immersed than i, and let myself hope for silence from a few so as to be heard when i see fit to express myself.
O mercado e a norma: o Estado moderno e a interven??o pública na economia
Reis, Bruno P. W.;
Revista Brasileira de Ciências Sociais , 2003, DOI: 10.1590/S0102-69092003000200004
Abstract: this article starts from a discussion on the weberian conception of the market as a means by excellence to foment "socialization among strangers" to then reflect theoretically on modernization and market. beyond evident suggestions involved in the reflexion on the role of market in the contemporary world, it aims to establish some specific nexus - despite all the tensions involved - between market archetype and the operation of the modern democratic political systems.
O mercado e a norma: o Estado moderno e a interven o pública na economia
Reis Bruno P. W.
Revista Brasileira de Ciências Sociais , 2003,
Abstract: Este artigo parte de uma discuss o da concep o weberiana do mercado como a forma por excelência de "socializa o entre estranhos" para refletir teoricamente sobre moderniza o e mercado. Para além das evidentes sugest es envolvidas na reflex o sobre o papel do mercado no mundo contemporaneo, procura-se estabelecer alguns nexos específicos - n o obstante todas as tens es envolvidas - entre o arquétipo do mercado e a opera o dos sistemas políticos democráticos modernos.
Over-Expressing Prohibitin (PHB) in Neuronal Cultures Exacerbates Cell Death Following Hydrogen Peroxide and L-Glutamic Acid Induced Injury  [PDF]
Jonathan Teoh, Sherif Boulos, Joanne Chieng, Neville W. Knuckey, Bruno P. Meloni
Neuroscience & Medicine (NM) , 2014, DOI: 10.4236/nm.2014.54018
Abstract:

Using proteomics, previous work in our laboratory identified five mitochondrial related proteins [citrate synthase (CS), glucose-regulated protein 75 (GRP75), heat shock protein 60 (HSP60), prohibitin (PHB), voltage-dependent anion channel 1 (VDAC1)] to be differentially expressed in primary cortical neuronal cultures following preconditioning treatments [1] [2]. To investigate a protective or damaging role of these five proteins in neurons, we used RNAi constructs to knockdown and adenoviral vectors to over-express the proteins in cortical neuronal cultures prior to exposure to three ischemia-related injury models: excitotoxicity (L-glutamic acid), oxidative stress (hydrogen peroxide) and in vitro ischemia (oxygen-glucose deprivation). We observed that down-regulating these mitochondrial proteins had no effect on neuronal viability, in any injury model. By contrast, over-expression of PHB exacerbated cell death in the hydrogen peroxide and L-glutamic acid injury models. These findings indicate that PHB plays

Ab initio study of mirages and magnetic interactions in quantum corrals
V. S. Stepanyuk,L. Niebergall,W. Hergert,P. Bruno
Physics , 2005, DOI: 10.1103/PhysRevLett.94.187201
Abstract: The state of the art ab initio calculations of quantum mirages,the spin-polarization of surface-state electrons and the exchange interaction between magnetic adatoms in Cu and Co corrals on Cu(111) are presented. We find that the spin-polarization of the surface-state electrons caused by magnetic adatoms can be projected to a remote location and can be strongly enhanced in corrals compared to an open surface.Our studies give a clear evidence that quantum corrals could permit to tailor the exchange interaction between magnetic adatoms at large separations. The spin-polarization of surface-state electrons at the empty focus in the Co corral used in the experimental setup of Manoharan et al., (Nature 403, 512 (2000)) is revealed.
Structure Sorting of Multiple Macromolecular States in Heterogeneous Cryo-EM Samples by 3D Multivariate Statistical Analysis  [PDF]
Bruno P. Klaholz
Open Journal of Statistics (OJS) , 2015, DOI: 10.4236/ojs.2015.57081
Abstract:

Heterogeneity of biological samples is usually considered a major obstacle for three-dimensional (3D) structure determination of macromolecular complexes. Heterogeneity may occur at the level of composition or conformational variability of complexes and affects most 3D structure determination methods that rely on signal averaging. Here, an approach is described that allows sorting structural states based on a 3D statistical approach, the 3D sampling and classification (3D-SC) of 3D structures derived from single particles imaged by cryo electron microscopy (cryo-EM). The method is based on jackknifing & bootstrapping of 3D sub-ensembles and 3D multivariate statistical analysis followed by 3D classification. The robustness of the statistical sorting procedure is corroborated using model data from an RNA polymerase structure and experimental data from a ribosome complex. It allows resolving multiple states within heterogeneous complexes that thus become amendable for a structural analysis despite of their highly flexible nature. The method has important implications for high-resolution structural studies and allows describing structure ensembles to provide insights into the dynamics of multi-component macromolecular assemblies.

Long-range electronic interactions between adatoms on transition metal surfaces
V. S. Stepanyuk,L. Niebergall,A. N. Baranov,W. Hergert,P. Bruno
Physics , 2004,
Abstract: Ab initio calculations of surface-state mediated interactions between Cu adatoms on transition metal surfaces are presented. We concentrate on Co/Cu(111) and Co(0001) substrates and compare results with our calculations for Cu(111). Our studies show that surface states of Co/Cu(111) and Co(0001) are spin-polarized. We reveal that long-range interactions between adatoms are mainly determined by sp-majority states. In contrast to Cu(111) and Co/Cu(111), the interaction between adatoms on Co(0001) is strongly suppressed at large adsorbate separations.
Ab initio approach for atomic relaxations in supported magnetic clusters
V. S. Stepanyuk,A. L. Klavsyuk,L. Niebergall,A. M. Saletsky,W. Hergert,P. Bruno
Physics , 2004,
Abstract: We present a newly developed scheme for atomic relaxations of magnetic supported clusters. Our approach is based on the full potential Korringa-Kohn-Rostoker Green's function method and the second moment tight-binding approximation for many-body potentials. We demonstrate that only a few iterations in ab initio calculations are necessary to find an equilibrium structure of supported clusters. As an example, we present our results for small Co clusters on Cu(001). Changes in electronic and magnetic states of clusters due to atomic relaxations are revealed.
Exchange interaction parameters and adiabatic spin-wave spectra of ferromagnets: A "renormalized magnetic force theorem"
P. Bruno
Physics , 2002, DOI: 10.1103/PhysRevLett.90.087205
Abstract: The ``magnetic force theorem'' is frequently used to compute exchange interaction parameters and adiabatic spin-wave spectra of ferromagnets. The interest of this approach is that it allows to obtain these results from a non-self-consistent calculation of the (single-electron) band energy only, which greatly reduces the computational effort. However, as discussed by various authors, this approach entail some systematic error. Here, a ``renormalized magnetic force theorem'' allowing to remove this systematic error without increasing significantly the computational effort is presented. For systems with one atom per unit cell, it amounts to a simple renormalization of the spin-wave spectrum. This renormalization greatly improves the agreement between calculated and experimental Curie temperatures of Fe and Ni.
Long-range magnetic interaction due to the Casimir effect
P. Bruno
Physics , 2002, DOI: 10.1103/PhysRevLett.88.240401
Abstract: The zero-point quantum fluctuations of the electromagnetic field in vacuum are known to give rise to a long-range attractive force between metal plates (Casimir effect). For ferromagnetic layers separated by vacuum, it is shown that the interplay of the Casimir effect and of the magneto-optical Kerr effect gives rise to a long-range magnetic interaction. The Casimir magnetic force is found to decay as $D^{-1}$ in the limit of short distances, and as $D^{-5}$ in the limit of long distances. Explicit expressions for realistic systems are given in the large and small distance limits. An experimental test of the Casimir magnetic interaction is proposed.
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