Macrozoobentos intermareal en playas arenosas de la Bahía Nueva (Patagonia, Argentina) y su uso como bioindicadores de impacto ambiental

Macrozoobenthos were collected from urban sandy beaches of Puerto Madryn and adjacent areas in November 2005. Multivariate analysis techniques (ANOVA, nMDS, ANOSIM, SIMPER and RDA) were used to characterize the area based on the relationships among biological and environmental variables. The areas affected by outfall of fishery factories and pluvial effluent were defined as “perturbed zones” due to the dominance of the pollution indicator polychaetes Boccardia polybranchia and Capitella “capitata” sp., which are associated with high values of ammonium, phosphates and organic matter. However, sandy beaches located 15 km from the city were considered as “unperturbed zones” because Psammodrilidae and Puelche orensanzi dominated, and they had high values of nitrates and dissolved oxygen. These taxa seem to be good candidates as indicators of clean zones for further studies. This is the first record of the family Psammodrilidae in the South Atlantic.Se recolectaron muestras de macrozoobentos en playas arenosas de la ciudad de Puerto Madryn y áreas adyacentes, en noviembre de 2005. Los análisis multivariantes (ANOVA, nMDS, ANOSIM, SIMPER y RDA) permitieron caracterizar el área en base a la relación entre las variables biológicas y ambientales. Las áreas afectadas por los desagües procedentes de las fábricas de pescado y los pluviales, fueron definidas como “zonas perturbadas”, debido a la dominancia de los poliquetos indicadores de contaminación Boccardia polybranchia y Capitella “capitata” sp., asociados a altos valores de amonio, fosfatos y materia orgánica. Por el contrario, las playas arenosas localizadas a 15 km de la ciudad fueron consideradas como “zonas no perturbadas” debido a que dominaron Psammodrilidae y Puelche orensanzi, con altos valores de nitratos y oxígeno disuelto. Estos taxa podrían ser buenos candidatos como indicadores de zonas limpias para futuros estudios. Se registra por primera vez la familia Psammodrilidae en el Atlántico Sur

Evidências de Correlação entre a Formação Yguari (Uruguai) e as Formações Rio do Rasto e Sanga do Cabral (Rio Grande do Sul - Brasil)

São apresentados os resultados do estudo de um perfil geológico realizado ao longo da rodovia Melo-Centurion, no Uruguai, em afloramentos da Formação Yaguari. O Membro Inferior desta unidade é dominantemente pelítico enquanto o Superior apresenta-se essencialmente arenoso, exibindo laminação planoparalela e estratificações cruzadas de pequeno a grande porte. O Membro Superior inclui também níveis de conglomerados intraformacionais, onde são encontrados fragmentos ósseos muito semelhantes aos que ocorrem na Formação Sanga do Cabral (Triássico Inferior) do Estado do Rio Grande do Sul. O Membro Inferior mais a parte basal do Membro Superior apresenta claras afinidades litológicas e de posicionamento estratigráfico com a Formação Rio do Rasto que aflora na rodovia Bagé-Aceguá; o Membro Superior, por sua vez, corresponde à Formação Sanga do Cabral. Em vista da correspondência traçada acima e da falta de evidências de um hiato sedimentar maior, o limite Permo-Triássico na região parece ser claramente gradacional

Impact of COVID-19 on cardiovascular testing in the United States versus the rest of the world

Objectives: This study sought to quantify and compare the decline in volumes of cardiovascular procedures between the United States and non-US institutions during the early phase of the coronavirus disease-2019 (COVID-19) pandemic. Background: The COVID-19 pandemic has disrupted the care of many non-COVID-19 illnesses. Reductions in diagnostic cardiovascular testing around the world have led to concerns over the implications of reduced testing for cardiovascular disease (CVD) morbidity and mortality. Methods: Data were submitted to the INCAPS-COVID (International Atomic Energy Agency Non-Invasive Cardiology Protocols Study of COVID-19), a multinational registry comprising 909 institutions in 108 countries (including 155 facilities in 40 U.S. states), assessing the impact of the COVID-19 pandemic on volumes of diagnostic cardiovascular procedures. Data were obtained for April 2020 and compared with volumes of baseline procedures from March 2019. We compared laboratory characteristics, practices, and procedure volumes between U.S. and non-U.S. facilities and between U.S. geographic regions and identified factors associated with volume reduction in the United States. Results: Reductions in the volumes of procedures in the United States were similar to those in non-U.S. facilities (68% vs. 63%, respectively; p = 0.237), although U.S. facilities reported greater reductions in invasive coronary angiography (69% vs. 53%, respectively; p < 0.001). Significantly more U.S. facilities reported increased use of telehealth and patient screening measures than non-U.S. facilities, such as temperature checks, symptom screenings, and COVID-19 testing. Reductions in volumes of procedures differed between U.S. regions, with larger declines observed in the Northeast (76%) and Midwest (74%) than in the South (62%) and West (44%). Prevalence of COVID-19, staff redeployments, outpatient centers, and urban centers were associated with greater reductions in volume in U.S. facilities in a multivariable analysis. Conclusions: We observed marked reductions in U.S. cardiovascular testing in the early phase of the pandemic and significant variability between U.S. regions. The association between reductions of volumes and COVID-19 prevalence in the United States highlighted the need for proactive efforts to maintain access to cardiovascular testing in areas most affected by outbreaks of COVID-19 infection

El lóbulo frontal y su rol en la depresión

The authors carry out an updating of the subject and present the classification of these disorders according to their lesion location and to the anatomoclinic correlation. Lastly they talk about the results in three patients treated from the neuropsyquiatric view within the framework of the above mentioned classification.Los autores realizaron una puesta al día del tema, exponen la clasificación de estos desórdenes según su geografía lesional y en virtud de la correlación anatomoclínica. Por último, comentan los hallazgos en tres pacientes abordados desde la óptica de la neuropsiquiatría en el marco de la referida clasificación

Architecture of the Distal Piedmont-Ligurian Rifted Margin in NW Italy: Hints for a Flip of the Rift System Polarity

International audienc

El Oroclino del Maipo: The Maipo Orocline: A first scale structural feature in the Miocene to Recent geodynamic evolution in the central Chilean Andes

International audienceIn this paper we show the results of a paleomagnetic study carried out along the western Andes of central Chile from 30° to 36°S. Whereas paleomagnetic analysis from Jurassic to Late Cretaceous rocks in the Pampean flat slab segment shows small or non significant clockwise vertical-axis rotations, results obtained in Late Jurassic to Neogeone rocks to the south, on the normal subduction segment, show sistematically clockwise rotations up to 40º. Paleomagnetic rotations are coeval with thrusting along the High Andes in Late Miocene times. We propose a coupled Bolivian Orocline-Juan Fernández Ridge (JFR) model where a far-field component of clockwise rotation related to the formation of the Bolivian Orocline was first acquired by the margin between 31º and 33ºS. The same area was later rotated by a slight counterclockwise component related to the subduction of the JFR over the last 10 Ma. South of 33ºS the clockwise rotations related to the Bolivian Orocline component were amplified by the subduction of the JFR

Historia y perspectivas de los estudios sobre poliquetos en Argentina

Se abordan diferentes temáticas relacionadas a la historia sobre los estudios de poliquetos en Argentina. Se analiza la evolución histórica de los estudios sobre estos anélidos, así como los investigadores que iniciaron y promovieron los primeros estudios sobre poliquetos recolectados en la Argentina. Luego, se brinda una perspectiva de los poliquetos en el marco de los estudios ecológicos. Se describen las especies registradas en playas arenosas y en la plataforma continental frente a Argentina. Otras temáticas abordadas fueron: 1) los poliquetos de agua dulce; 2)Los ensambles de poliquetos en respuesta a la contaminación orgánica; 3)El poliqueto invasor Boccardia proboscidea(Spionidae) en Argentina; 4)Los estudios biogeográficos; 5) Estudios taxonómicos y de diversidad local. Situación actual y situación futura.Si bien las investigaciones sobre una temática tan específica como los poliquetos nunca han sido particularmente impulsadas, algunos proyectos sobre taxonomía y ecología han sido financiados por entidades nacionales. Existe en la actualidad una iniciativa estratégica en el área de la investigación científica del mar, denominada "Pampa Azul". El objetivo de este proyecto es profundizar el conocimiento científico para fundamentar las prácticas de conservación y manejo de recursos renovables.Fil: Elias, Rodolfo. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Jaubet, Maria Lourdes. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencia Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Ferrando, Agustina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico; ArgentinaFil: Saracho Bottero, Maria Andrea. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentin