A deep survey of the Large Magellanic Cloud at ∼ 0.1−100 TeV photon energies with the Cherenkov Telescope Array is planned. We assess the detection prospects based on a model for the emission of the galaxy, comprising the four known TeV emitters, mock populations of sources, and interstellar emission on galactic scales. We also assess the detectability of 30 Doradus and SN 1987A, and the constraints that can be derived on the nature of dark matter. The survey will allow for fine spectral studies of N 157B, N 132D, LMC P3, and 30 Doradus C, and half a dozen other sources should be revealed, mainly pulsar-powered objects. The remnant from SN 1987A could be detected if it produces cosmic-ray nuclei with a flat power-law spectrum at high energies, or with a steeper index 2.3 − 2.4 pending a flux increase by a factor > 3 − 4 over ∼ 2015 − 2035. Large-scale interstellar emission remains mostly out of reach of the survey if its > 10 GeV spectrum has a soft photon index ∼ 2.7, but degree-scale 0.1 − 10 TeV pion-decay emission could be detected if the cosmic-ray spectrum hardens above >100 GeV. The 30 Doradus star-forming region is detectable if acceleration efficiency is on the order of 1 − 10% of the mechanical luminosity and diffusion is suppressed by two orders of magnitude within < 100 pc. Finally, the survey could probe the canonical velocity-averaged cross section for self-annihilation of weakly interacting massive particles for cuspy Navarro-Frenk-White profiles.
Ruminant livestock are important sources of human food and global greenhouse gas emissions. Feed degradation and methane formation by ruminants rely on metabolic interactions between rumen microbes and affect ruminant productivity. Rumen and camelid foregut microbial community composition was determined in 742 samples from 32 animal species and 35 countries, to estimate if this was influenced by diet, host species, or geography. Similar bacteria and archaea dominated in nearly all samples, while protozoal communities were more variable. The dominant bacteria are poorly characterised, but the methanogenic archaea are better known and highly conserved across the world. This universality and limited diversity could make it possible to mitigate methane emissions by developing strategies that target the few dominant methanogens. Differences in microbial community compositions were predominantly attributable to diet, with the host being less influential. There were few strong co-occurrence patterns between microbes, suggesting that major metabolic interactions are non-selective rather than specific.
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A partir del análisis de la configuración de los paisajes arqueológicos en el bosque montano de las yungas tucumanas, entre 400 aC y 1500 dC, se discuten los cambios y continuidades en la práctica y las condiciones en las cuales estos se reprodujeron. Como resultado de las investigaciones arqueológicas llevadas a cabo en Anfama desde el año 2014, se identificaron 14 asentamientos residenciales de distinta escala, los cuales fueron mapeados, sondeados, fechados y, algunos de ellos, excavados. El análisis cronológico, realizado en base a contextos materiales y a 15 dataciones radiocarbónicas, permite proponer cuatro bloques temporales que se diferencian en las modalidades de construir y habitar los espacios domésticos y en la utilización de materias primas a través de determinadas tecnologías. Se discute cómo las trazas materiales de la práctica social traslapan a dicha segmentación cronométrica, de la misma manera en que eventos constructivos, habitacionales y depositacionales se superponen en determinados lugares. Finalmente, se reconocen tendencias de larga duración que giran en torno a la dispersión poblacional como atributo que define a los paisajes y a las lógicas sociales que se sostuvieron en el área de estudio por casi dos milenios.
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