Browsing by Author "Diaz, Carolina"
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- ItemCOMPOSITION, DIVERSITY AND SIZE OF DIATOMS CONSUMED BY THE ANDEAN FLAMINGO (PHOENICOPARRUS ANDINUS) IN SALAR DE PUNTA NEGRA, ANTOFAGASTA REGION, NORTHERN CHILE(2012) Tobar, Claudio; Rau, Jaime R.; Iriarte, Agustin; Villalobos, Rodrigo; Lagos, Nicolas; Cursach, Jaime; Diaz, Carolina; Fuentes, Norka; Gantz, AlbertoIn April 2009, at the Salar de Punta Negra (24 degrees 35'S, 68 degrees 58'W) in the Antofagasta Region of northern Chile, we quantified the composition, diversity, and size of diatoms, the only consumed prey by both adults and nestlings of Andean Flamingos (Phoenicoparrus andinus). We identified a total of 39 species, 34 in the faeces of nestlings and 25 in adult faeces. The most abundant species in both was Surirella se//a and Denticula thermal/s. The most frequent diatoms observed in the nestlings' faeces were S. se/la, D. thermalis, Pinnularia sp. and Haloroundia speciosa, whereas in the adult faeces they were Denticula thermalis, Surirella se//a, Pinnularia sp. and Haloroundia speciosa. There was no statistically significant difference in diatoms consumed by adults and nestlings. The dietary similarity between adults and nestlings was 0.644. The nestlings consumed a greater diversity of diatoms than adults. The most consumed diatom by adults (S. sea) was sized between 58 and 140 mu m, with a greater frequency for organisms between 70 and 100 mu m. The size of the diatoms consumed by nestlings was between 40 and 120 mu m with a greater frequency of organisms between 60 and 90 pm. Comparing the sizes of the consumed diatoms, we found that adults preferred individuals of greater size than nestlings. Accepted 18 June 2012.
- ItemCovid-19 in hospitalized kidney transplant recipients: analysis of the multicenter registry during the first wave of the pandemic in Chile(2024) Pefaur, Jacqueline; Toro, Luis; Badilla, Ximena; Ardiles, Leopoldo; Boltansky, Andres; Rosatti, Pia; Tapia, Beatriz; Rocca, Ximena; Mur, Paola; Fernandez, Alicia; Castillo, Alvaro; Diaz, Carolina; Elgueta, Leticia; Garcia, Francisco; Mueller, Hans; Mansilla, Rodrigo; Munoz, Carolina; Salvatici, Marcelo; Selame, Maria Esperanza; Valenzuela, Marcela; Zamora, Daniela; Enciso, Giovanni; Panace, Rita; Cabrera, Sebastian; Ortiz, Ana Mireya; Mardones, Sandra; Oshiro, Carolina; Sanchez, Juan Eduardo; Lorca, Eduardo; Torres, RubenIntroduction: The severity of COVID-19 infection in kidney transplant patients has been well -documented. Objectives : This study aims to determine the epidemiological and clinical data and identify predictors of poor prognosis during the epidemic's early stages. Material and methods : This is a national semi -prospective, multicenter study of subjects with functioning grafts who were infected during the first wave of the pandemic in Chile between March 1 and September 31, 2020. Results : during this period, we recorded the hospitalization of 97 adult patients throughout the entire national territory. The average age was 52.5 years, 62% men, 45% hypertensive, 11% coronary, 10% diabetic, and 5% with chronic obstructive pulmonary disease, with an average post -transplant follow-up of 7.2 years and an average previous renal function of 47.7ml/min/1.7m2 (CKD-EPI formula). Between the onset of symptoms and diagnosis, there was an average period of 4.8 days, with a predominance of cough (44%), dyspnea (42%), and fever (42%). 34% developed acute kidney injury, and 36% of them required dialysis support. The lethality was 30%, prevailing in those with multiple organ failure (80%) and those who required invasive mechanical ventilation (52%). In the multivariate analysis, the best predictors of mortality were older age (OR: 2.92) and living in a low-income commune (OR: 2.35). Conclusions : This national project of the Chilean Society of Nephrology provided valuable information for monitoring the epidemiological evolution of the pandemic. It also helped to propose priority vaccination strategies, adjust immunosuppressive therapy, and design logistical aspects to reduce the risks for transplant patients.
- ItemFreshwater diatom evidence for Southern Westerly Wind evolution since-18 ka in northwestern Patagonia(2023) Diaz, Carolina; Moreno, Patricio I.; Villacis, Leonardo A.; Sepulveda-Zuniga, Einer A.; Maidana, Nora I.We report a fossil diatom record from small closed-basin Lago Lepue ' (43 degrees S) to examine past changes in freshwater ecosystems and hydrologic balance in northwestern Patagonia since-18 ka. The record starts with abundant staurosiroids and the heavily silicified Aulacoseira granulata suggesting deep turbulent mixing during a low lake level stand between -18-16.4 ka. A. distans increased shortly after-16.4 ka and achieved maximum abundance between-15.4-13.6 ka, while A. granulata disappeared at-15.8 ka and A. alpigena rose at-14.9 ka to its maximum between-13-12 ka. We infer turbulent, cold, and circumneutral to slightly acid lake conditions contemporaneous with a steady lake level rise that started at-16.4 ka and culminated between-13-12 ka. These trends reversed between-11-7.8 ka with the dominance of Discostella stelligera and staurosiroids, suggesting warmer lake conditions and shallower mixing. Subsequent changes include increases of A. distans with D. stelligera between-7.8-5.8 ka, dominance of the former between-5.8-3.3 ka, a rapid increase in A. perglabra at-3.3 ka, and ensuing diversification of benthic acidophilous species. We infer a rapid lake-level decline between-11-7.8 ka, with subsequent rising pulses at-7.8 ka and-5.8 ka, a multimillennial-scale lake acidification trend, and overall high lake levels with centennial-scale reversals between-6-0 ka. Coherent variations in terrestrial and aquatic ecosystem changes recorded in the same core suggest negative hydrologic balance between-18-16.4 ka and-11-7.8 ka, positive balance between-14.9-12 ka and-6-0 ka, with transitional conditions in the interim, overprinted by millennial-scale changes and enhanced variability since-6 ka. Covariation with paleoclimate records at regional, pan-Patagonian, and hemispheric scale suggests millennial to centennial-scale variability superimposed upon a multi-millennial pacing of Southern Westerly Wind evolution since-18 ka.
- ItemGuía clínica chilena de urticaria crónica espontánea(2018) Aguilera Insunza, Raquel; Correa, Hernan; Diaz, Carolina; Angelica Marinovic, Maria; Valenzuela, Fernando