Browsing by Author "Gonzalez, Rodrigo"

Now showing 1 - 5 of 5
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    A Methodology Based on Magnetic Susceptibility to Characterize Copper Mine Tailings
    (2020) Lam, Elizabeth J.; Carle, Rodrigo; Gonzalez, Rodrigo; Montofre, Italo L.; Veloso, Eugenio A.; Bernardo, Antonio; Canovas, Manuel; Alvarez, Fernando A.
    This paper intends to validate the application of magnetic techniques, particularly magnetic susceptibility, as sampling tools on a copper tailings terrace, by correlating them analytically. Magnetic susceptibility was measured in both the field and laboratory. Data obtained allowed for designing spatial magnetic susceptibility distribution maps, showing the horizontal variation of the tailings. In addition, boxplots were used to show the variation of magnetic susceptibility and the concentration of the elements analyzed at different depths of the copper tailings terrace. The degree of correlation between magnetic and chemical variables was defined with coefficient R2. The horizontal and vertical variations of magnetic susceptibility, the concentration of elements, and the significant correlations between them show a relationship between magnetic susceptibility and the chemical processes occurring in the tailing management facility, such as pyrite oxidation. Thus, the correlation functions obtained could be used as semiquantitative tools to characterize tailings or other mining residues.
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    Biomarkers as predictors of renal damage in neonates undergoing cardiac surgery
    (SAGE PUBLICATIONS LTD, 2020) Borchert, Evelyn; de la Fuente, Rene; Guzman, Ana Maria; Gonzalez, Katia; Rolle, Augusto; Morales, Karina; Gonzalez, Rodrigo; Jalil, Roberto; Lema, Guillermo
    Background:
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    Case report: Multi-site perfusion strategy for type A acute aortic dissection complicated with cerebral malperfusion
    (2023) Besa, Santiago; Castelli, Fiorenza; Garrido-Olivares, Luis; Gonzalez, Rodrigo; Marine, Leopoldo; Becker, Pedro
    Acute type A dissection presenting with cerebral malperfusion has high morbidity and mortality. Given the complexity of underlying vascular involvement, it is a challenging clinical scenario. Many of these patients are not deemed surgical candidates. If surgery is considered, it often requires complex aortic arch and neck vessel reconstruction. We present a 48-year-old male with an acute type A aortic dissection that presented with paraplegia and decreased level of consciousness. A Computed Tomography showed occlusion of both common carotid arteries. He was successfully treated with a multi-site perfusion strategy and a Hybrid Frozen Elephant Trunk graft to achieve fast restoration of the cerebral circulation and minimize brain ischemia and permanent neurological damage. From this case, we learn that aggressive arch and neck vessel reconstruction supported by multi-site perfusion could help improve mortality and neurological outcomes in selected patients.
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    SYMPTOMS AND SENSITIVITY TO CHILLING INJURY OF CANTALOUPE MELONS DURING POSTHARVEST
    (INST INVESTIGACIONES AGROPECUARIAS, 2009) Krarup, Christian; Toha, Jaime; Gonzalez, Rodrigo
    The nature and development of specific symptoms of chilling injury (CI) and the variation in sensitivity to the disorder of different cultivars of cantaloupe melons (Cucumis melo L. subsp. melo var. cantalupensis Naudin) was assessed during two seasons. Twenty-three cultivars of the Eastern Shipper (2), Western Shipper (13) and Galia (8) types were grown in a semiarid environment in Curacav (33 degrees 27' S, 70 degrees 38' W), Chile, using common cultural practices. Fruits were harvested at the half-slip stage, except Galia (3/5 color), graded, washed, and stored for 18 days at 0 degrees C, with an additional 3 days at 20 degrees C. Symptoms of CI appeared with varying intensity in almost all cultivars and were generally similar. Symptoms developed progressively: surface discoloration progressed from light pink to brownish to black, followed by large sunken areas, and eventually, discrete indentations and net whitening. Surface decay was not present in most fruits and should be considered a consequence rather than a symptom of CI. Cultivars had different sensitivities to the disorder; some cultivars were severely injured (Athena, Colima and Revigal) whereas others developed almost no symptoms of CI (Hy-Mark, Gal 96, and Voyager I). The response variability to chilling showed the need for precise temperature recommendations for these cultivars, and signaled a potential for future long-term transport or storage of some cultivars.
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    Venoarterial Extracorporeal Membrane Oxygenation as A Bridge to Surgery in Post-Myocardial Infarction Ventricular Septal Defect with Cardiogenic Shock: Case Report
    (2023) Besa, Santiago; Walbaum, Jonathan; Gonzalez, Rodrigo; Baraona, Fernando; Garrido-Olivares, Luis
    We describe a 60-year-old woman with post-myocardial infarction (MI) ventricular septal defect (VSD) and cardiogenic shock who was successfully stabilized with veno-arterial extracorporeal membrane oxygenation (VA-ECMO) as a bridge therapy for the surgical closure of her VSD. This case highlights the role of VA-ECMO in the management of post-MI VSD to improve the results of surgical repair and patient survival.