Generación de biogas a partir de la degradación de residuos orgánicos de frigoríficos

Se presentan los primeros resultados obtenidos del estudio de los parámetros característicos de la degradación de residuos orgánicos colectados en un frigorífico de peces ubicado en Bella Vista – Corrientes- Argentina. Se armaron 8 reactores a escala de laboratorio y un digestor de 200 l instalado a campo abierto. Las temperaturas de trabajo en ambas situaciones fueron entre 25 y 35 °C, tiempo de retención hidráulico 30 días, y el contenido de estiércol en la suspensión: 10%, 25%, 50% y 100% en el laboratorio y 50% en el digestor de campo. Los reactores de laboratorio se hicieron funcionar de manera discontinua. Se midieron la cantidad de biogás generado y acumulado. La concentración de metano en el biogás generado a campo abierto varió entre 45% y 60%. Se concluyó que el tratamiento anaerobio del efluente colectado en el frigorífico es una opción de depuración biológica y técnica de generación de energía útil.The characteristic parameters of the degradation of organic waste collected in a fish slaughterhouse located in Bella Vista – Corrientes- Argentina were study using 8 laboratory scale reactors and 200 l digester. Temperatures in both situations were between 25 and 35 ° C, hydraulic retention time 30 days, and the content of manure in suspension: 10%, 25%, 50% and 100% in the laboratory and 50% in the digester field. Laboratory reactors were operated batchwise. Biogas generated and accumulated were measured. Methane concentration varied between 45% and 60%. The anaerobic treatment of effluent collected in a slaughterhouse, is an option of biological and technical debugging generating useful energy.Tema 6: Energía eólica, geotermia, biomasa y otras energías no convencionales.Facultad de Arquitectura y Urbanism

Generación de biogas a partir de la degradación de residuos orgánicos de frigoríficos

Se presentan los primeros resultados obtenidos del estudio de los parámetros característicos de la degradación de residuos orgánicos colectados en un frigorífico de peces ubicado en Bella Vista – Corrientes- Argentina. Se armaron 8 reactores a escala de laboratorio y un digestor de 200 l instalado a campo abierto. Las temperaturas de trabajo en ambas situaciones fueron entre 25 y 35 °C, tiempo de retención hidráulico 30 días, y el contenido de estiércol en la suspensión: 10%, 25%, 50% y 100% en el laboratorio y 50% en el digestor de campo. Los reactores de laboratorio se hicieron funcionar de manera discontinua. Se midieron la cantidad de biogás generado y acumulado. La concentración de metano en el biogás generado a campo abierto varió entre 45% y 60%. Se concluyó que el tratamiento anaerobio del efluente colectado en el frigorífico es una opción de depuración biológica y técnica de generación de energía útil.The characteristic parameters of the degradation of organic waste collected in a fish slaughterhouse located in Bella Vista – Corrientes- Argentina were study using 8 laboratory scale reactors and 200 l digester. Temperatures in both situations were between 25 and 35 ° C, hydraulic retention time 30 days, and the content of manure in suspension: 10%, 25%, 50% and 100% in the laboratory and 50% in the digester field. Laboratory reactors were operated batchwise. Biogas generated and accumulated were measured. Methane concentration varied between 45% and 60%. The anaerobic treatment of effluent collected in a slaughterhouse, is an option of biological and technical debugging generating useful energy.Tema 6: Energía eólica, geotermia, biomasa y otras energías no convencionales.Facultad de Arquitectura y Urbanism

QT interval duration in apparently healthy men is associated with depression-related personality trait neuroticism

OBJECTIVE: High levels of neuroticism and low self-esteem are markers for vulnerability to depression, a condition associated with a higher risk of arrhythmias. The question as to whether these depression-related personality domains are related to cardiac repolarization (duration of QT interval) in apparently healthy men has been addressed in this study. METHODS: Participants were 658 clinically healthy males who underwent a health screening programme. QT interval duration was determined in the resting 12-lead electrocardiogram using an automated analysis program. Neuroticism was assessed by the short-scale Eysenck Personality Questionnaire and self-esteem by the Rosenberg self-esteem scale. RESULTS: Heart-rate corrected QT interval {QTc, formula of Bazett [Bazett HC. An analysis of time relations of electrocardiograms. Heart 1920;7:353-370]} progressively increased across quartiles of neuroticism ratings. By contrast, no differences in QTc were observed across different degrees of self-esteem. A multivariate regression analysis showed that neuroticism was a statistically significant, independent predictor of QTc duration. CONCLUSION: After adjustment for potential confounders, neuroticism scores independently predicted QT interval duration in apparently healthy men. These findings highlight the possibility that higher arrhythmic risk could be present not only in patients with clinical depression but also in depression-prone, otherwise healthy individuals

The role of lung metastasis resection in improving outcome of colorectal cancer patients: Results from a large retrospective study

BACKGROUND: The role of surgery for lung metastases (LM) secondary to colorectal cancer (CRC) remains controversial. The bulk of evidence is derived from single surgical series, hampering any definitive conclusions. The aim of this study was to compare the outcomes of CRC patients with LM submitted to surgery with those who were not. PATIENTS AND METHODS: Data from 409 patients with LM as the first evidence of advanced disease were extracted from a database of 1,411 patients. Patients were divided into three groups: G1, comprised of 155 patients with pulmonary and extrapulmonary metastases; G2, comprised of 104 patients with LM only and no surgery; G3, comprised of 50 patients with LM only and submitted to surgery. RESULTS: No difference in response rates emerged between G1 and G2. Median progression-free survival (PFS) times were: 10.3 months, 10.5 months, and 26.2 months for G1, G2, and G3, respectively. No difference in PFS times was observed between G1 and G2, whereas there was a statistically significant difference between G2 and G3. Median overall survival times were 24.2 months, 31.5 months, and 72.4 months, respectively. Survival times were longer in resected patients: 17 survived >5 years and three survived >10 years. In patients with LM only and no surgery, four survived for 5 years and none survived >10 years. CONCLUSIONS: Even though patients with resectable LM are more likely to be those with a better outcome, our study provides evidence suggesting an active role of surgery in improving survival outcomes in this patient subset

End-tidal carbon dioxide (ETCO2) and ventricular fibrillation amplitude spectral area (AMSA) for shock outcome prediction in out-of-hospital cardiac arrest. Are they two sides of the same coin?

Aim: Ventricular fibrillation amplitude spectral area (AMSA) and end-tidal carbon dioxide (ETCO2) are predictors of shock success, understood as restoration of an organized rhythm, and return of spontaneous circulation (ROSC). However, little is known about their combined use. We aimed to assess the prediction accuracy when combined, and to clarify if they are correlated in out of hospital cardiac arrest' victims. Materials and Methods: Records acquired by external defibrillators in out-of-hospital cardiac arrest patients of the Lombardia Cardiac Arrest registry were processed. The 1-min pre-shock ETCO2 median value (METCO2) was computed from the capnogram and AMSA (2\u201348 mV.Hz range) computed applying the Fast Fourier Transform to a 2-second pre-shock filtered ECG interval (0.5 1230 Hz). Support Vector Machine (SVM) predictive models based on METCO2, AMSA and their combination were fit; results were given as the area under the curve (AUC) of the receiver operating characteristic (ROC) curves. Results: We considered 112 patients with 391 shocks delivered. METCO2 and AMSA were predictors of shock success [AUC (IQR) of the ROC curve: 0.59 (0.56 120.62); 0.68 (0.65 120.72), respectively] and of ROSC [0.56 (0.53 120.59); 0.74 (0.71 120.78),]. Their combination in a SVM model increased the accuracy for predicting shock success [AUC (IQR) of the ROC curve: 0.71 (0.68 120.75)] and ROSC [0.77 (0.73 120.8)]. AMSA and METCO2 were significantly correlated only in patients who achieved ROSC (rho = 0.33 p = 0.03). Conclusions: AMSA and ETCO2 predict shock success and ROSC after every shock, and their predictive power increases if combined. Notably, they were correlated only in patients who achieved ROSC