Determination of the isotopic enrichment factor during denitrification by ethanol

En este estudio se han realizado experimentos de tipo batch para calcular el fraccionamiento isotópico del NO3- durante la desnitrificación que tiene lugar en las aguas subterráneas con contenidos de nitratos superiores a los 240 mg/L en un sitio de la Cuenca del río Matanza-Riachuelo (CMR). En medio anóxico (caja de guantes con una atmósfera de argón), se utilizaron botellas de vidrio que se llenaron con 15 mg de sedimento, 75 mL de agua con un contenido de nitrato de 243 mg/L y se añadió 30 μL de etanol. Los valores isotópicos del NO3- durante el proceso desnitrificante variaron en un rango de +11.20 a +56.50 para δ15N-NO3- y entre +7.05‰ a +65.68‰ para δ18O-NO3-. Los valores del factor de enriquecimiento isotópico obtenidos fueron -27.5‰ para εN y de -33.7‰ para εO.Centro de Investigaciones Geológica

Determination of the isotopic enrichment factor during denitrification by ethanol

En este estudio se han realizado experimentos de tipo batch para calcular el fraccionamiento isotópico del NO3- durante la desnitrificación que tiene lugar en las aguas subterráneas con contenidos de nitratos superiores a los 240 mg/L en un sitio de la Cuenca del río Matanza-Riachuelo (CMR). En medio anóxico (caja de guantes con una atmósfera de argón), se utilizaron botellas de vidrio que se llenaron con 15 mg de sedimento, 75 mL de agua con un contenido de nitrato de 243 mg/L y se añadió 30 μL de etanol. Los valores isotópicos del NO3- durante el proceso desnitrificante variaron en un rango de +11.20 a +56.50 para δ15N-NO3- y entre +7.05‰ a +65.68‰ para δ18O-NO3-. Los valores del factor de enriquecimiento isotópico obtenidos fueron -27.5‰ para εN y de -33.7‰ para εO.Centro de Investigaciones Geológica

Determination of the isotopic enrichment factor during denitrification by ethanol

En este estudio se han realizado experimentos de tipo batch para calcular el fraccionamiento isotópico del NO3- durante la desnitrificación que tiene lugar en las aguas subterráneas con contenidos de nitratos superiores a los 240 mg/L en un sitio de la Cuenca del río Matanza-Riachuelo (CMR). En medio anóxico (caja de guantes con una atmósfera de argón), se utilizaron botellas de vidrio que se llenaron con 15 mg de sedimento, 75 mL de agua con un contenido de nitrato de 243 mg/L y se añadió 30 μL de etanol. Los valores isotópicos del NO3- durante el proceso desnitrificante variaron en un rango de +11.20 a +56.50 para δ15N-NO3- y entre +7.05‰ a +65.68‰ para δ18O-NO3-. Los valores del factor de enriquecimiento isotópico obtenidos fueron -27.5‰ para εN y de -33.7‰ para εO.Centro de Investigaciones Geológica

Spatial patterns of summer demersal fish assemblages around the Antarctic Peninsula and South Shetland Islands

During the research programme conducted on the OV Puerto Deseado in the summers of 2011 and 2013, 36 stations were sampled using a demersal net at depths between 53–590 m in the Antarctic Peninsula and South Shetland Islands. A total 3378 fish specimens belonging to 36 species were recorded. Notothenidae was the best-represented family in species number, with Lepidonotothen nudifrons, L. larseni and Trematomus scotti being the most numerous species. Of the fish assemblages, 20% of the species were considered as dominant, 10% as common, 13% as occasional and 57% as rare. Six groups (and two sub-groups) were obtained by the ordination diagram based on geographical location: group 1=Gerlache Strait, group 2=Deception Islands, group 3=Biscoe Island, group 4=between Elephant and King George islands, group 5=northern Antarctic Peninsula, and group 6=South Shetland Islands, with sub-groups 6a shallower South Shetland Islands and 6b deeper South Shetland Islands. Sampling depth and water temperature significantly explained the spatial pattern. A latitudinal pattern of decreasing abundance from north-east to south-west was found in L. larseni and the opposite in T. scotti. The predictability of fish composition in the assemblages’ areas could be a useful tool for ecosystem-based management.Fil: Llompart, Facundo Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego; ArgentinaFil: Delpiani, Sergio Matias. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Lattuca, María Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaFil: Delpiani, Gabriela Elina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Cruz Jiménez, Adriana Milena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaFil: Orlando, Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Ceballos, Santiago Guillermo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego; ArgentinaFil: Diaz de Astarloa, Juan Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Vanella, Fabián Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaFil: Fernandez, Daniel Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego; Argentin

Prevalence, associated factors and outcomes of pressure injuries in adult intensive care unit patients: the DecubICUs study

Funder: European Society of Intensive Care Medicine; doi: http://dx.doi.org/10.13039/501100013347Funder: Flemish Society for Critical Care NursesAbstract: Purpose: Intensive care unit (ICU) patients are particularly susceptible to developing pressure injuries. Epidemiologic data is however unavailable. We aimed to provide an international picture of the extent of pressure injuries and factors associated with ICU-acquired pressure injuries in adult ICU patients. Methods: International 1-day point-prevalence study; follow-up for outcome assessment until hospital discharge (maximum 12 weeks). Factors associated with ICU-acquired pressure injury and hospital mortality were assessed by generalised linear mixed-effects regression analysis. Results: Data from 13,254 patients in 1117 ICUs (90 countries) revealed 6747 pressure injuries; 3997 (59.2%) were ICU-acquired. Overall prevalence was 26.6% (95% confidence interval [CI] 25.9–27.3). ICU-acquired prevalence was 16.2% (95% CI 15.6–16.8). Sacrum (37%) and heels (19.5%) were most affected. Factors independently associated with ICU-acquired pressure injuries were older age, male sex, being underweight, emergency surgery, higher Simplified Acute Physiology Score II, Braden score 3 days, comorbidities (chronic obstructive pulmonary disease, immunodeficiency), organ support (renal replacement, mechanical ventilation on ICU admission), and being in a low or lower-middle income-economy. Gradually increasing associations with mortality were identified for increasing severity of pressure injury: stage I (odds ratio [OR] 1.5; 95% CI 1.2–1.8), stage II (OR 1.6; 95% CI 1.4–1.9), and stage III or worse (OR 2.8; 95% CI 2.3–3.3). Conclusion: Pressure injuries are common in adult ICU patients. ICU-acquired pressure injuries are associated with mainly intrinsic factors and mortality. Optimal care standards, increased awareness, appropriate resource allocation, and further research into optimal prevention are pivotal to tackle this important patient safety threat

Correction to: Prevalence, associated factors and outcomes of pressure injuries in adult intensive care unit patients: the DecubICUs study

The original version of this article unfortunately contained a mistake

Prevalence, associated factors and outcomes of pressure injuries in adult intensive care unit patients: the DecubICUs study

Funder: European Society of Intensive Care Medicine; doi: http://dx.doi.org/10.13039/501100013347Funder: Flemish Society for Critical Care NursesAbstract: Purpose: Intensive care unit (ICU) patients are particularly susceptible to developing pressure injuries. Epidemiologic data is however unavailable. We aimed to provide an international picture of the extent of pressure injuries and factors associated with ICU-acquired pressure injuries in adult ICU patients. Methods: International 1-day point-prevalence study; follow-up for outcome assessment until hospital discharge (maximum 12 weeks). Factors associated with ICU-acquired pressure injury and hospital mortality were assessed by generalised linear mixed-effects regression analysis. Results: Data from 13,254 patients in 1117 ICUs (90 countries) revealed 6747 pressure injuries; 3997 (59.2%) were ICU-acquired. Overall prevalence was 26.6% (95% confidence interval [CI] 25.9–27.3). ICU-acquired prevalence was 16.2% (95% CI 15.6–16.8). Sacrum (37%) and heels (19.5%) were most affected. Factors independently associated with ICU-acquired pressure injuries were older age, male sex, being underweight, emergency surgery, higher Simplified Acute Physiology Score II, Braden score 3 days, comorbidities (chronic obstructive pulmonary disease, immunodeficiency), organ support (renal replacement, mechanical ventilation on ICU admission), and being in a low or lower-middle income-economy. Gradually increasing associations with mortality were identified for increasing severity of pressure injury: stage I (odds ratio [OR] 1.5; 95% CI 1.2–1.8), stage II (OR 1.6; 95% CI 1.4–1.9), and stage III or worse (OR 2.8; 95% CI 2.3–3.3). Conclusion: Pressure injuries are common in adult ICU patients. ICU-acquired pressure injuries are associated with mainly intrinsic factors and mortality. Optimal care standards, increased awareness, appropriate resource allocation, and further research into optimal prevention are pivotal to tackle this important patient safety threat

Applying reactive transport modelling in a chromium-contaminated site in the Matanza-Riachuelo basin, Buenos Aires, Argentina

Chromium (Cr) is one of the main pollutants affecting both soil and groundwater systems in some areas within the Matanza-Riachuelo River Basin (MRB) in Argentina. The particular site of study is located near an abandoned tannery and chemical industry facilities. Cr toxicity and mobility depend on its oxidation state: Cr(VI) is an active carcinogen, more soluble and mobile, whereas Cr(III) shows low toxicity and solubility, precipitating in the form of amorphous Cr(OH)3(am). This paper is devoted to elucidate the main key controls on the Cr(VI)-plume transport at this site using reactive transport (RT) modelling and uncertainty quantification analysis tools. RT results suggest a Cr source term on the surface to explain the observed Cr concentrations in both Pampeano and Puelche aquifers. UQ analysis indicates that the Cr(VI) concentrations in both aquifers are sensitive to hydraulic connectivity between them, the reaction reduction rates Cr(VI)-Cr(III) and the organic matter contents.Fil: Ceballos, Elina Estefania. Comisión de Investigaciones Científicas de la Provincia de Buenos Aires. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff". - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff". - Universidad Nacional del Centro de la Provincia de Buenos Aires. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff"; ArgentinaFil: Bea, Sergio Andrés. Comisión de Investigaciones Científicas de la Provincia de Buenos Aires. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff". - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff". - Universidad Nacional del Centro de la Provincia de Buenos Aires. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff"; ArgentinaFil: Sanci, Romina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotópica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotópica; Argentin

Epilepsia en menores de 3 años

Se estudiaron 96 pacientes menores de 3 años, ingresados en el Servicio de Neurología Pediátrica de nuestro Centro, con diagnóstico de epilepsia, con el objetivo de evaluar la aplicación de la clasificación de los ataques, la de Epilepsia y Síndromes Epilépticos aceptados actualmente por la Liga Internacional Contra la Epilepsia (ILAE). En ellos se observó con mayor frecuencia la presentación de ataques parciales (58,3 %), seguido de los generalizados (36,5 %) e indeterminados (5 %); no se presentaron diferencias significativas respecto a la distribución de éstos entre menores de 1 año y los comprendidos en edades entre 1 y 3 años. En 28 pacientes se encontraron dificultades para clasificarlos acorde con la de Epilepsia y Síndromes Epilépticos, y se analizaron su distribución y características. Se comentan brevemente los resultados del electroencefalograma (EEG) en relación con la actividad paroxística y se presentan los síndromes más frecuentemente observados.<br>96 patients under 3 years old admitted at the Pediatric Neurologic Department of our Center with an epilepsy diagnosis were studied to evaluate the application of the seizure classification into Epilepsy and Epileptic Syndromes, accepted at present by the International League Against Epilepsy (ILAE). Partial seizures (58,3 %) were more frequent among them, followed by generalized seizures (36,5 %) and undetermined seizures (5 %). No significant differences were found in connection with their distribution among children under one year old and those between 1 and 3 years old. Difficulties were observed to classify 28 patients according to Epilepsy and Epileptic Syndromes, where as their distribution and characteristics were analyzed. EEG results in relation to the paroxyntic activity are briefly commented and the most observed syndromes are presented