Patrones de dinámica de un ecosistema multicohortal de Pinus culminicola Andresen & Beaman y Pinus hartwegii Lindl. en una fracción de la Sierra Madre Oriental por Marco Aurelio González Tagle

Tesis (Maestría en Ciencias Forestales) U.A.N.L.

La Pax Romana (Tito Flavio Vespasiano: 69 d.C. - Marco Aurelio antonino: 180 d.C.) a la luz de la Teoría de la Estabilidad Hegemónica : aplicabilidad de una teoría moderna de las relaciones internacionales a un caso históricamente antiguo

El presente trabajo intenta aplicar la teoría de la Estabilidad Hegemónica al análisis de un sistema internacional no contemporáneo (no Estado-Westfaliano) permitiendo observar la trascendencia de las teorías de las Relaciones Internacionales en el tiempo; permite ampliar el margen de estudio de las relaciones internacionales obteniendo nuevas herramientas de análisis para futuros debates teóricos: si existe una trascendencia de las teorías de las relaciones internacionales hacia el pasado, ¿podrían ser aplicables en un futuro ausente de Estados-Nación? Ahora bien, los aportes pueden brindar sustento a la Teoría de la Estabilidad Hegemónica considerándola como la mejor propuesta para analizar la configuración del sistema internacional que permita concretar una estabilidad económico-política en las relaciones internacionales mundiales.

Governador Tarso Genro inaugura Sala de Gestão com a presença do Professor Marco Aurelio Ruediger

Reportagem retirada da TV Piratini

Marco Aurelio : filosofía y discurso íntimo

La obra de Marco Aurelio es la manifestación final de la ética estoica. El Emperador de Roma vive continuamente en medio de muchas guerras por la defensa de su territorio. Pueblos germánicos atacaban sus fronteras en el noreste cuando puso en orden para sus amigos muchos pensamientos o notas recopiladas durante años. Estas notas tienen forma de un cuaderno de notas o de un diario íntimo y contenido filosófico. Las teorías contemporáneas de la autobiografía han estudiado estas formas y definen sus rasgos con precisión, pero existen múltiples diferencias entre la personalidad de los hombres antiguos y modernos. Esto vuelve espinosa la interpretación de los pensamientos aurelianos si usamos solamente los conceptos actuales de la literatura íntima. Nuestro artículo muestra estas dificultades.

Libro de Marco Aurelio [Texto impreso] : con l'horologio de principi : destinto in IIII volumi

Ilustraciones xil. en el 4º libro

Marco aurelio con el Relox de principes.

Mode of access: Internet.

Libro aureo de Marco Aurelio emperador.

CCBE S. XVI,

Los doce libros del emperador Marco Aurelio /

Mode of access: Internet.

Gut Bacteria Products Prevent Aki Induced By Ischemia-reperfusion.

Short-chain fatty acids (SCFAs) are fermentation end products produced by the intestinal microbiota and have anti-inflammatory and histone deacetylase-inhibiting properties. Recently, a dual relationship between the intestine and kidneys has been unraveled. Therefore, we evaluated the role of SCFA in an AKI model in which the inflammatory process has a detrimental role. We observed that therapy with the three main SCFAs (acetate, propionate, and butyrate) improved renal dysfunction caused by injury. This protection was associated with low levels of local and systemic inflammation, oxidative cellular stress, cell infiltration/activation, and apoptosis. However, it was also associated with an increase in autophagy. Moreover, SCFAs inhibited histone deacetylase activity and modulated the expression levels of enzymes involved in chromatin modification. In vitro analyses showed that SCFAs modulated the inflammatory process, decreasing the maturation of dendritic cells and inhibiting the capacity of these cells to induce CD4(+) and CD8(+) T cell proliferation. Furthermore, SCFAs ameliorated the effects of hypoxia in kidney epithelial cells by improving mitochondrial biogenesis. Notably, mice treated with acetate-producing bacteria also had better outcomes after AKI. Thus, we demonstrate that SCFAs improve organ function and viability after an injury through modulation of the inflammatory process, most likely via epigenetic modification.

Metal Ions Bound To The Human Milk Immunoglobulin A: Metalloproteomic Approach.

The presence of calcium, iron, and zinc bound to human milk secretory IgA (sIgA) was investigated. The sIgA components were first separated by two-dimensional polyacrylamide gel electrophoresis and then identified by electrospray ionization-tandem mass spectrometry (ESI MS MS). The metal ions were detected by flame atomic absorption spectrometry after acid mineralization of the spots. The results showed eight protein spots corresponding to the IgA heavy chain constant region. Another spot was identified as the transmembrane secretory component. Calcium was bound to both the transmembrane component and the heavy chain constant region, while zinc was bound to the heavy chain constant region and iron was not bound with the identified proteins. The association of a metal ion with a protein is important for a number of reasons, and therefore, the findings of the present study may lead to a better understanding of the mechanisms of action and of additional roles that sIgA and its components play in human milk.

The Missing Part of Seed Dispersal Networks: Structure and Robustness of Bat-Fruit Interactions

Mutualistic networks are crucial to the maintenance of ecosystem services. Unfortunately, what we know about seed dispersal networks is based only on bird-fruit interactions. Therefore, we aimed at filling part of this gap by investigating bat-fruit networks. It is known from population studies that: (i) some bat species depend more on fruits than others, and (ii) that some specialized frugivorous bats prefer particular plant genera. We tested whether those preferences affected the structure and robustness of the whole network and the functional roles of species. Nine bat-fruit datasets from the literature were analyzed and all networks showed lower complementary specialization (H(2)' = 0.3760.10, mean 6 SD) and similar nestedness (NODF = 0.5660.12) than pollination networks. All networks were modular (M=0.32 +/- 0.07), and had on average four cohesive subgroups (modules) of tightly connected bats and plants. The composition of those modules followed the genus-genus associations observed at population level (Artibeus-Ficus, Carollia-Piper, and Sturnira-Solanum), although a few of those plant genera were dispersed also by other bats. Bat-fruit networks showed high robustness to simulated cumulative removals of both bats (R = 0.55 +/- 0.10) and plants (R = 0.68 +/- 0.09). Primary frugivores interacted with a larger proportion of the plants available and also occupied more central positions; furthermore, their extinction caused larger changes in network structure. We conclude that bat-fruit networks are highly cohesive and robust mutualistic systems, in which redundancy is high within modules, although modules are complementary to each other. Dietary specialization seems to be an important structuring factor that affects the topology, the guild structure and functional roles in bat-fruit networks.

Cold Nuclear Matter Effects on J/psi Yields as a Function of Rapidity and Nuclear Geometry in d plus A Collisions at root S(NN)=200 GeV

We present measurements of J/psi yields in d + Au collisions at root S(NN) = 200 GeV recorded by the PHENIX experiment and compare them with yields in p + p collisions at the same energy per nucleon-nucleon collision. The measurements cover a large kinematic range in J/psi rapidity (-2.2 < y < 2.4) with high statistical precision and are compared with two theoretical models: one with nuclear shadowing combined with final state breakup and one with coherent gluon saturation effects. In order to remove model dependent systematic uncertainties we also compare the data to a simple geometric model. The forward rapidity data are inconsistent with nuclear modifications that are linear or exponential in the density weighted longitudinal thickness, such as those from the final state breakup of the bound state.

Azimuthal correlations of electrons from heavy-flavor decay with hadrons in p plus p and Au plus Au collisions at root s(NN)=200 GeV

Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled p+p collisions. These measurements indicate that charm and bottom quarks interact with the hot dense matter produced in heavy-ion collisions much more than expected. Here we extend these studies to two-particle correlations where one particle is an electron from the decay of a heavy-flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interactions between heavy quarks and the matter, such as whether the modification of the away-side-jet shape seen in hadron-hadron correlations is present when the trigger particle is from heavy-meson decay and whether the overall level of away-side-jet suppression is consistent. We statistically subtract correlations of electrons arising from background sources from the inclusive electron-hadron correlations and obtain two-particle azimuthal correlations at root s(NN) = 200 GeV between electrons from heavy-flavor decay with charged hadrons in p+p and also first results in Au+Au collisions. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to p+p collisions.