484 research outputs found
Reaffirming the connection between the Galactic stellar warp and the Canis Major overdensity
We perform a critical re-analysis and discussion of recent results presented
in the literature which interpret the CMa overdensity as the signature of an
accreting dwarf galaxy or a new substructure within the Galaxy. Several issues
are addressed. We show that arguments against the ``warp'' interpretation are
based on an erroneous perception of the Milky Way. There is nothing anomalous
with colour--magnitude diagrams on opposite sides of the average warp mid-plane
being different. We witnessed the rise and fall of the blue plume population,
first attributed to young stars in a disrupting dwarf galaxy and now discarded
as a normal disc population. Similarly, there is nothing anomalous in the outer
thin+thick disc metallicities being low (-1<[Fe/H]<-0.5), and spiral arms (as
part of the thin disc) should, and do, warp. Most importantly, we show
unambiguously that, contrary to previous claims, the warp produces a stellar
overdensity that is distance-compatible with that observed in CMa.The CMa
over-density remains fully accounted for in a first order approach by Galactic
models without new substructures. Given the intrinsic uncertainties (concerning
the properties of the warp, flare and disc cutoff, the role of extinction and
degeneracy), minor deviations with respect to these models are not enough to
support the hypothesis of an accreted dwarf galaxy or new substructure within
the Milky Way disc.Comment: A&A Letter, accepted, 4 pages, 3 figure
Manufactura y uso de instrumentos de hueso en sitios prehistóricos del este de Uruguay
En este trabajo analizamos, desde un punto de vista tecno-funcional, un conjunto de herramientas recuperadas en dos yacimientos prehistóricos en las tierras bajas del Este de Uruguay. Estas herramientas son objeto de análisis tecnológicos y funcionales, obteniéndose interesantes resultados sobre todo a nivel funcional, que muestran los diferentes usos que se le dieron a estas herramientas a la vez que las ubican dentro del esquema productivo general.  
Analysis of the Calls Received during the COVID-19 Lockdown by the Mental Health Crisis Helpline Operated by the Professional College of Psychology of Aragon
COVID-19 has had a direct impact on the physical and mental health of millions of people worldwide. Therefore, a Mental Health Crisis Helpline (MHCH) was set up and offered free of charge by the Professional College of Psychology of Aragon (COPPA) during the lockdown period. This research aims to study the reasons for the calls, to describe the population segments that used it, and to analyse the possible relationships between the variables studied. A total of 1411 calls were answered and 598 were registered. The main reasons for the calls were: anxiety symptoms, concern for a relative, previous mental health problems, conflicts, and depressive symptoms. Significantly more men called for anxiety symptoms (60.8% vs. 49.5%) versus more women calling regarding a chronic physical illness (3.5% vs. 0.7%), concern about a relative (22.7% vs. 12.4%), care guidelines (6% vs. 1.3%), and bereavement (6.2% vs. 2%). Calls regarding conflict increased slightly as the lockdown period progressed (p < 0.001; r = 0.15), in contrast with calls regarding previous psychological conditions and anxiety symptoms (p = 0.035; r = -0.09; p = 0.005; r = -0.12). These results highlight the intensive use of the MHCH, confirming the need for the implementation of specific psychological care resources in times of crisis. © 2022 by the authors. Licensee MDPI, Basel, Switzerland
Degradación de hidrocarburos de petróleo por bacterias aisladas de manglares
The petroleum hydrocarbon contamination represents a worldwide problem, since its accumulation promotes a serious environmental impact. Thereby, the use of microorganisms, such as those from mangrove micro biota, as degrading agents of various carbon sources is poorly exploited in environmental remediation processes. Thus, this in vitro study evaluated the degrading potential of isolated bacteria from mangrove sediments in the degradation of petroleum hydrocarbons. Analysis of the genetic diversity using the 16S rRNA marker revealed closely related (99%) sequences with Proteobacterium, Pseudomonas and Exiguobacterium. Results showed the bacterial growth in the mineral saline medium (MSM) containing 1% petroleum or diesel, as carbon sources. This growth was determinated by optical density at 595 nm for 15 days, with sample withdrawal every 48 h. Bacterial growth indicated the hydrocarbon metabolization. However, bacteria were more efficient at degrading petroleum. Overall, experimental data displayed the potential application of these bacteria in bioremediation processes, due to their metabolic and adaptive capacities to grow in a rich hydrocarbon medium.Los hidrocarburos de petróleo representan un problema mundial, pues su acumulación promueve un serio impacto ambiental. Así, el uso de microorganismos, por ejemplo los de la microbiota de manglares, como agentes degradadores de diversas fuentes de carbono, es poco explotado en procesos de remediación ambiental. Así, este estudio evaluó in vitro el potencial degradador de bacterias aisladas de sedimento de manglar en la degradación de hidrocarburos. El análisis genético usando el marcador 16S rRNA reveló secuencias íntimamente relacionadas (99%) con Proteobacterium, Pseudomonas y Exiguobacterium. Los resultados mostraron el crecimiento de bacterias en medio salino mineral (MSM) conteniendo petróleo o diesel al 1%, como fuentes de carbono. Este crecimiento, determinado por densidad óptica (DO) a 595 nm durante 15 días, con toma de muestras a cada 48 h, indicó la matabolización de hidrocarburos. Sin embargo, las bacterias fueron más eficientes en degradarlos. Por lo tanto, los resultados muestran la potencial aplicación de las bacterias en procesos de biorremediación por su capacidad metabólica y adaptativa de crecimiento usando hidrocarburos
Readiness Potential in Parkinson's Disease: Effects of L-Dopa Therapy and Brain Transplants
Accurate local positioning systems usually use a network of anchor nodes at known locations to track mobile nodes based on the measurement of the time of arrival (TOA) at anchor nodes of beacon signals transmitted by the mobile nodes. To localize the mobile node either TOA processing, where the unknown transmit time is estimated along with the node location, or time difference of arrival (TDOA) processing, where the transmit time is eliminated before estimating the node location, can be used. We show that the position error bound of both these formulations are the same by analyzing the Cramér-Rao lower bound. When processing data collected in field trials, however, we observed that the TOA processing yields better localization accuracy, and explain this behavior using differential geometry-based curvature measures that show that the TDOA cost function has greater degree of non-linearity.T. Sathyan, M. Hedley, M. Mallic
Gene Prioritization through Consensus Strategy, Enrichment Methodologies Analysis, and Networking for Osteosarcoma Pathogenesis
[Abstract] Osteosarcoma is the most common subtype of primary bone cancer, affecting mostly adolescents. In recent years, several studies have focused on elucidating the molecular mechanisms of this sarcoma; however, its molecular etiology has still not been determined with precision. Therefore, we applied a consensus strategy with the use of several bioinformatics tools to prioritize genes involved in its pathogenesis. Subsequently, we assessed the physical interactions of the previously selected genes and applied a communality analysis to this protein–protein interaction network. The consensus strategy prioritized a total list of 553 genes. Our enrichment analysis validates several studies that describe the signaling pathways PI3K/AKT and MAPK/ERK as pathogenic. The gene ontology described TP53 as a principal signal transducer that chiefly mediates processes associated with cell cycle and DNA damage response It is interesting to note that the communality analysis clusters several members involved in metastasis events, such as MMP2 and MMP9, and genes associated with DNA repair complexes, like ATM, ATR, CHEK1, and RAD51. In this study, we have identified well-known pathogenic genes for osteosarcoma and prioritized genes that need to be further explored.Instituto Carlos III; PI17/01826Xunta de Galicia; ED431C 2018/49Xunta de Galicia; ED431G/0
Fascioliasis en caballos de valles andinos de Lujan de Cuyo, Mendoza: prevalencia y parámetros hematológicos
La fascioliasis es una
enfermedad parasitaria cuyo agente
etiológico en el Nuevo Mundo es el tremátodo
Fasciola hepatica y afecta a numerosas
especies de mamíferos y al ser
humano. A pesar de que en Argentina
el rol de los rumiantes como reservorios
ha sido bastante estudiado, a la fecha
es muy poca la información disponible
sobre fascioliasis en equinos, tanto a nivel internacional
como nacional. Su importancia como reservorio se ve
incrementada dado que estos animales son trasladados
frecuentemente a eventos deportivos o utilizados como
animales de carga y transporte, particularmente en zonas
andinas. En lo concerniente al efecto que puede
tener este parásito sobre los parámetros hematológicos
del caballo, la información a nivel mundial es sumamente
escasa.
Su objetivo es describir prevalencia de fascioliasis en caballos
de valles andinos de Luján de Cuyo. Describir pará-
metros hematológicos en caballos naturalmente parasitados
con Fasciola hepatica
Impacto clínico de parasitosis digestivas prevalentes en equinos de zonas andinas de la provincia de Mendoza
Los equinos, principalmente los caballos y los mulares, juegan un importante
rol en las zonas andinas como animales de transporte y carga, como así también
en actividades deportivas y recreativas. Las enfermedades parasitarias
pueden afectar su salud, bienestar y capacidad para el trabajo y el deporte.
Algunas de ellas, como la fascioliasis, tienen relevancia en salud pública, pues
afectan al ser humano.
Según estudios llevados a cabo por nuestro equipo de investigación del
Centro de Investigación en Parasitología Regional (CIPAR), la epidemiología de
las parasitosis que afectan los animales domésticos en la provincia de Mendoza,
dadas sus características climáticas y ecológicas, difiere sustancialmente
del resto del país. En equinos hemos descrito una situación similar, pues, a
diferencia de lo establecido por la literatura, la fascioliasis, enfermedad producida en América por el trematodo
zoonótico Fasciola hepática, es una parasitosis con altas prevalencias en equinos de zonas andinas. La estrongilosis
equina se encuentra también presente, pero con cargas parasitarias relativamente bajas. Se desconoce
el impacto real de esta parasitosis sobre la salud de los equinos en la región. Hemos realizado relevamientos coprológicos
en toda la provincia y se describieron casos equinos asociados a un nuevo lymnaeido vector, Lymnaea
neotropica, el cual hemos descripto por primera vez para Argentin
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