Bibliotecología como forma de activismo político y social

Interview with the Director of the Free Library of Social Librarianship (CaLiBiSo), of the Faculty of Philosophy and Letters of the University of Buenos Aires, Mgter. Julio Díaz Jatuf, from Argentina

High-protein diet for body weight loss

A proporção ideal dos macronutrientes em dietas de emagrecimento é atualmente bastante discutida. Existem evidências de que dietas com maior proporção de proteína aumentam a perda de peso e de gordura corporal e diminuem a perda de massa corporal magra durante o emagrecimento. Todavia, os mecanismos responsáveis por estes efeitos não estão totalmente esclarecidos. Além disso, existem poucas conclusões a respeito dos possíveis efeitos colaterais dessas dietas na função renal e no estado nutricional relativo ao cálcio. Assim, este artigo objetiva trazer informações atuais sobre os efeitos de dietas ricas em proteína na perda de peso e na composição corporal e dos mecanismos envolvidos, bem como seus efeitos na função renal e no estado nutricional relativo ao cálcio.The ideal proportion of macronutrients in weight loss diets is currently under debate. There are evidences indicating that a higher proportion of protein during weight loss diets enhances the loss of body weight and fat mass, and reduces the loss of lean body mass. Nevertheless, the responsible mechanisms for these effects have not yet been fully elucidated. Furthermore, studies that evaluated the possible side effects of these diets on the renal function and on the nutritional state of calcium have shown inconclusive results. Therefore, this article has the objective to convey recent information about the effects of high-protein diets in the regulation of the body weight and body composition, besides its involved mechanisms, and its effects on the renal function and on the calcium nutritional status

Note: Vectorial-magneto optical Kerr effect technique combined with variable temperature and full angular range all in a single setup

Here, we report on a versatile full angular resolved/broad temperature range/vectorial magneto optical Kerr effect (MOKE) magnetometer, named TRISTAN. Its versatility relies on its capacity to probe temperature and angular dependencies of magnetization reversal processes without the need to do any intervention on the apparatus during measurements. The setup is a combination of a vectorial MOKE bench and a cryostat with optical access. The cryostat has a motorized rotatable sample holder with azimuthal correction. It allows for simultaneous and quantitative acquisition of the two in-plane magnetization components during the hysteresis loop at different temperatures from 4 K up to 500 K and in the whole angular range, without neither changing magnet orientation nor opening the cryostat. Measurements performed in a model system with competing collinear biaxial and uniaxial contributions are presented to illustrate its capabilitiesP.P. acknowledges financial support from MINECO through Contract No. JCI-2011- 09602. F.J.T. acknowledges financial support from Ramon y Cajal program (RYC-2011-09617). This work has been supported by MINECO through Project Nos. MAT2011-25598 and MAT2012-39308, by the Comunidad de Madrid through Project No. S2013/MIT-2850 NANOFRONTMAG-CM and by EU-FP7 through NANOPYME Project (No. 310516

Galaxy-Induced Transformation of Dark Matter Halos

We use N-body/gasdynamical LambdaCDM cosmological simulations to examine the effect of the assembly of a central galaxy on the shape and mass profile of its dark halo. Two series of simulations are compared; one that follows only the evolution of the dark matter component and a second one where a baryonic component is added. These simulations include radiative cooling but neglect star formation and feedback, leading most baryons to collect at the halo center in a disk which is too small and too massive when compared with typical spiral. This unrealistic model allows us, nevertheless, to gauge the maximum effect that galaxies may have in transforming their dark halos. We find that the shape of the halo becomes more axisymmetric: halos are transformed from triaxial into essentially oblate systems, with well-aligned isopotential contours of roughly constant flattening (c/a ~ 0.85). Halos always contract as a result of galaxy assembly, but the effect is substantially less pronounced than predicted by the "adiabatic contraction" hypothesis. The reduced contraction helps to reconcile LambdaCDM halos with constraints on the dark matter content inside the solar circle and should alleviate the long-standing difficulty of matching simultaneously the scaling properties of galaxy disks and the luminosity function. The halo contraction is also less pronounced than found in earlier simulations, a disagreement that suggests that halo contraction is not solely a function of the initial and final distribution of baryons. Not only how much baryonic mass has been deposited at the center of a halo matters, but also the mode of its deposition. It might prove impossible to predict the halo response without a detailed understanding of a galaxy's assembly history. (Abriged)Comment: 11 pages and 9 figure

Room Temperature In-plane <100> Magnetic Easy Axis for Fe3O4/SrTiO3(001):Nb Grown by Infrared PLD

We examine the magnetic easy-axis directions of stoichiometric magnetite films grown on SrTiO3:Nb by infrared pulsed-laser deposition. Spin-polarized low-energy electron microscopy reveals that the individual magnetic domains are magnetized along the in-plane film directions. Magneto-optical Kerr effect measurements show that the maxima of the remanence and coercivity are also along in-plane film directions. This easy-axis orientation differs from bulk magnetite and films prepared by other techniques, establishing that the magnetic anisotropy can be tuned by film growth.Comment: 3 pages, 3 figure

Emergence of the Stoner-Wohlfarth astroid in thin films at dynamic regime

The Stoner-Wohlfarth (SW) model is the simplest model that describes adequately the magnetization reversal of nanoscale systems that are small enough to contain single magnetic domains. However for larger sizes where multi-domain effects are present, e.g., in thin films, this simple macrospin approximation fails and the experimental critical curve, referred as SW astroid, is far from its predictions. Here we show that this discrepancy could vanish also in extended system. We present a detailed angular-dependent study of magnetization reversal dynamics of a thin film with well-defined uniaxial magnetic anisotropy, performed over 9 decades of applied field sweep rate (dH/dt). The angular-dependent properties display a gradual transition from domain wall pinning and motion-like behaviour to a nucleative single-particle one, as dH/dt increases. Remarkably, in the high dynamic regime, where nucleation of reversed domains is the dominant mechanism of the magnetization reversal (nucleative regime), the magnetic properties including the astroid become closer to the ones predicted by SW model. The results also show why the SW model can successfully describe other extended systems that present nucleative regime, even in quasi-static conditionsThis work has been supported by MINECO (Ministerio de Economía y Competitividad) through Projects No. MAT2012-39308, FIS2015-67287-P, and FIS2016-78591-C3-1-R, by the Comunidad de Madrid through Project S2013/MIT-2850 NANOFRONTMAG-CM, and by MINECO through the FLAGERA Programme of Graphene Flagship: SOgraph project (No. PCIN-2015-216); and M-era.Net Programme: NEXMAG project (PCIN- 2015-126). IMDEA-Nanociencia acknowledges support from the ‘Severo Ochoa’ Program for Centres of Excellence in R&D (MINECO, Grant SEV-2016-0686). P.P. acknowledges support through the Marie Curie AMAROUT EU Programme and JCI-2011-09602. A.B. acknowledges MINECO through the ENMA-National project (MAT2014-56955-R)

Bibliotecología como forma de activismo político y social

Interview with the Director of the Free Library of Social Librarianship (CaLiBiSo), of the Faculty of Philosophy and Letters of the University of Buenos Aires, Mgter. Julio Díaz Jatuf, from Argentina

Más cuentos tradicionales de la provincia de Ciudad Real

Informaciones sobre la biografía y sobre la actividad de registro y estudio de los cuentos tradicionales españoles de Julio Camarena Laucirica. Edición de varios cuentos inéditos, recogidos por él en la provincia de Ciudad Real: los números 774C, 898, 922, 1688 y 1960G + 1882 del catálogo Aarne-Thompson-Uther. Edición fotográfica de los números 1316 y 1358D.Reports on the biography and on the work of recording and study of Spanish folk tales made by Julio Camarena Laucirica. Edition of some never edited folktales, recorded by Camarena in the province of Ciudad Real: numbers 774C, 898, 922, 1688 and 1960G + 1882 of Aarne-Thompson-Uther catalogue. Photograph edition of numbers 1316 and 1358D

Más cuentos tradicionales de la provincia de Ciudad Real

Informaciones sobre la biografía y sobre la actividad de registro y estudio de los cuentos tradicionales españoles de Julio Camarena Laucirica. Edición de varios cuentos inéditos, recogidos por él en la provincia de Ciudad Real: los números 774C, 898, 922, 1688 y 1960G + 1882 del catálogo Aarne-Thompson-Uther. Edición fotográfica de los números 1316 y 1358D.Reports on the biography and on the work of recording and study of Spanish folk tales made by Julio Camarena Laucirica. Edition of some never edited folktales, recorded by Camarena in the province of Ciudad Real: numbers 774C, 898, 922, 1688 and 1960G + 1882 of Aarne-Thompson-Uther catalogue. Photograph edition of numbers 1316 and 1358D