Resumen El presente trabajo forma parte del programa de estudios actualísticos que estamos desarrollando en el marco de nuestras investigaciones arqueológicas en el NE del Macizo del Deseado (Santa Cruz, Argentina). Tiene por objetivo identificar los distintos agentes y procesos tafonómicos que actúan modificando los restos óseos depositados en las distintas unidades geomorfológicas del Parque Nacional Bosques Petrificados de Jaramillo (PNBPJ), para evaluar cuáles de estos microambientes ofrecen condiciones extremas de preservación (buenas vs. malas). Para alcanzar el objetivo llevamos adelante el relevamiento sistemático por transectas de restos de vertebrados modernos distribuidos en distintas unidades geomorfológicas, previamente definidas. Las tendencias obtenidas se discuten con aquellas generadas a partir de la misma metodología en los sectores de Los Toldos, La Huella y Laguna Sierras Blancas, ubicados al noroccidente del PNBPJ. Los resultados indican que en el PNBPJ las mesetas altas son la unidad geomorfológica donde hay menos preservación del registro óseo y que las mesetas intermedias corresponden a las unidades donde existen más posibilidades de localización de contextos en estratigrafía a cielo abierto. Las observaciones realizadas, coinciden con las realizadas previamente en el sector norte del macizo acerca del potencial destructivo de las mesetas altas, y aportan al conocimiento de los procesos de preservación y destrucción del registro óseo que operan en los distintos microambientes del sector. Los resultados obtenidos son de utilidad para el avance de las investigaciones arqueológicas en el área de estudio.

Abstract This work is part of the actualistic study program that we are developing within the framework of our archaeological research in the NW of the Deseado Massif (Santa Cruz, Argentina). Its objective is to identify the different agents and taphonomic processes that act modifying the bone remains deposited in the different geomorphological units of the Jaramillo Petrified Forests National Park (PNBPJ), to evaluate which of these microenvironments offer extreme preservation conditions (good vs. bad). To achieve the objective, we carry out the systematic survey by transects and register the remains of modern vertebrates distributed in different geomorphological units, previously defined. The trends obtained are discussed with those generated from the same methodology in the Los Toldos, La Huella and Laguna Sierras Blancas sectors, located to the northwest of the PNBPJ. The results indicate that in the PNBPJ the high plateaus are the geomorphological unit where there is less preservation of the bone record, and that the intermediate plateaus correspond to the units where there are more possibilities of locating contexts in open-pit stratigraphy. The observations made coincide with those previously made in the northern sector of the massif about the destructive potential of the high plateaus and contribute to the knowledge of the processes of preservation and destruction of the bone record that operate in the different microenvironments of the sector. The results obtained are useful for the advancement of archaeological research in the study area.

ABSTRACT Mortality due to SARS-CoV-2 is high compared to that caused by other respiratory viruses. This article aims to define the comorbidities associated with high mortality rates or complications that require ventilatory support in intensive care units. A bibliographic search has been performed with respect to comorbidities and/or alterations in laboratory tests and radiographic exams that have been associated with mortality, especially those described in China.

RESUMEN La infección por COVID-19 presenta una elevada mortalidad respecto a otros virus respiratorios. En este artículo buscamos definir las comorbilidades que están asociadas a la elevada mortalidad o a las complicaciones que requieren mayor soporte ventilatorio en unidades de cuidados intensivos. Se ha diseñado una búsqueda bibliográfica con respecto a las comorbilidades y/o alteraciones en los exámenes de laboratorio y los estudios radiológicos que se han asociado a la presencia de mortalidad, especialmente en los casos descritos en China.

Introduction: Periodontitis is a chronic disease that results from an interaction of a mixed bacterial challenge and the host response. Objective: The purposes of this study were to evaluate the IgG serum levels to Porphyromonas gingivalis antigens by ELISA in individuals with different periodontal conditions correlated with clinical parameters, and to analyze the immunoreactivity profiles by Western blotting. Methods: Serum IgG levels against the cell sonicate antigen from P. gingivalis ATCC 33277 of 28 patients with chronic periodontitis (CP), 10 patients with gingivitis (G) and 21 periodontally healthy individuals (H) were measured by ELISA and Western immunoblotting. Results: In the CP group, sera reactivity by ELISA was significantly higher than in the G and H groups (Kruskal-Wallis p<0.001; Dunnet t3 p= 0.001 and Dunnet t3 p= 0.0001). There was no statistically significant difference between G and HP reactivity (Dunnett t3 p=0.617). Among individuals with chronic periodontitis, the IgG-anti-P. gingivalis serum levels were positively correlated with percentage of clinical attachment level =5mm (r s = + 0.375, p<0.05) and a negative correlation was found between IgG-anti-P. gingivalis levels and percentage of probing pocket depth 0-3mm (r s = - 0. 411, p< 0.05). The analysis of sera immunoreactivity profiles to sonicate antigen by Western blotting showed differences between the sera of CP, G and H group individuals. The serum from CP frequently reacted with high molecular weight (103 kDa, 86 kDa, 72 kDa, 60 kDa, 58 kDa, 52 kDa) protein fractions. Conclusions: Serum levels of IgG anti-P. gingivalis distinguished individuals with chronic periodontitis, gingivitis and healthy periodontium. There was a correlation between clinical parameters and serum IgG levels against P. gingivalis. There was a difference in the recognition profile of protein fractions among the studied groups and some bands were more specific