Time filter

Source Type

Olavarria, Argentina

The National University of Central Buenos Aires is a public institution of higher learning located in Tandil, a city in the central region of Buenos Aires Province, Argentina. It was founded in 1974 as part of University of Buenos Aires Professor Alberto Taquini's plan to geographically diversify Argentina's National University system.Established with the unification of a private school and a campus of the National University of the South, the university includes 10 schools offering 21 undergraduate, 58 graduate, and 19 post-graduate degrees. It maintains secondary campuses in Azul, Olavarría and Quequén. Wikipedia.

Buscaglia C.,National University of Central Buenos Aires
Avian Diseases

The presence of reticuloendotheliosis virus (REV) was examined in flocks affected with Marek's disease (MD). Sera were positive to REV antibodies by agar gel precipitation. However, these findings were not conclusive since fowlpox vaccines can have REV fragments or the whole genome inserted. Frozen sections from tumors were positive for MD virus (MDV) but negative for REV. Chicken embryo fibroblast (CEF) and chicken kidney cell (CKC) culture inoculated with buffy coat cells or blood from the affected birds were examined. Positive cells were shown for REV and MDV by fluorescent antibodies tests in CEF and CKC, respectively, indicating the presence of REV in Argentinean layer flocks. This is the first report of REV in Argentina and also in South America. © American Association of Avian Pathologists. Source

Negroni R.,National University of Central Buenos Aires
Clinics in Dermatology

Cryptococcosis is a systemic fungal infection, caused by encapsulated yeast of the genus Cryptococcus, C neoformans and C gattii. These environmental microorganisms live in pigeon and other bird droppings, as well as in the fruit and bark of various trees. Infection in humans and other animal species usually occurs by inhalation and less frequently through the skin and by ingestion of the fungus. Most infections have a benign course and resolve spontaneously; however, the incidence of cryptococcosis has increased considerably, mainly due to diverse causes of immunodeficiency, particularly AIDS. Cryptococcus neoformans infections are common, worldwide, and severe forms are seen in immunocompromised patients. Cases caused by C gattii predominate in tropical or subtropical regions. Cryptococcosis may present as an acute, subacute, or chronic lung disease, as a nonpurulent cerebrospinal fluid meningitis, or as a severe infection with fever, anemia, lymphadenopathy, and hepatosplenomegaly. The eye can be affected, with partial or total loss of vision. Diagnosis is by direct observation of the causative agent, in histopathologic studies, by isolation in culture, and by the presence of capsular antigen. Treatment is the intravenous administration of amphotericin B deoxycholate, alone or combined with 5-fluorocytosine or fluconazole, which can be given orally or intravenously. Itraconazole is less effective when the central nervous system is affected. Voriconazole appears to be a drug that can be used in these patients. In AIDS patients, secondary prophylaxis is administered with fluconazole or amphotericin B and is continued until CD4 cell counts exceed 200 cells/μL. Evaluation of intracranial pressure is important in the first weeks after diagnosis in AIDS patients. © 2012 Elsevier Inc. Source

Pereira J.A.,National University of Central Buenos Aires
Journal of Arid Environments

The activity pattern of mammalian carnivores is influenced by several factors, including environmental conditions, interference from competitors, and behavioral thermoregulation. Facing extreme environmental conditions the activity rhythm of animals may change. The activity patterns of Geoffroy's cats (Leopardus geoffroyi) were studied during a period of prey scarcity in a scrubland area of central Argentina, based on five individuals radio-collared and monitored by radio-telemetry. Activity readings were recorded every 15 min during 6- to 24-h observation periods, and a total of 3121 fixes totaling 780.3 h of monitoring were gathered for these cats. Geoffroy's cats were significantly more active during daytime (58.1 ± 9.4% of active fixes) than during the night (33.6 ± 2.9%). Although they were active at any time of the day, an activity peak was recorded from 12.00 to 17.00 h. This pattern is opposite to those observed in other areas or even to that recorded for this species in the same area during a period of higher prey abundance. This apparent shift toward diurnal activity could be a response to a combination of ecological (prey availability, predators or competition avoidance) and physiological (energy saving) factors. Geoffroy's cats are behaviorally flexible, but this ability may not be enough to maintain survival (and population size) under harsh environmental conditions. © 2010 Elsevier Ltd. Source

Purslow P.,National University of Central Buenos Aires
Meat Science

A recent article in this journal documents enhanced sensory qualities of pork cooked to low temperatures. The aim of this letter is to point out that the incidence of Trichinella spiralis in many countries and the more widespread incidence of Toxoplasma gondii present a concern for the adoption of low temperature cooking of pork unless extended cooking times are used. © 2016. Source

Benvenuto O.G.,National University of La Plata | Benvenuto O.G.,National University of Central Buenos Aires | Bersten M.C.,University of Tokyo | Nomoto K.,University of Tokyo
Astrophysical Journal

We perform binary stellar evolutionary calculations following the simultaneous evolution of both stars in the system to study a potential progenitor system for the Type IIb supernova 2011dh. Pre-explosion photometry as well as light-curve modeling has provided constraints on the physical properties of the progenitor system. Here, we present a close binary system (CBS) that is compatible with such constraints. The system is formed by stars of solar composition with 16 M⊙ + 10 M⊙ on a circular orbit with an initial period of 125 days. The primary star ends its evolution as a yellow supergiant with a mass of ≈4 M⊙, a final hydrogen content of ≈(3-5) × 10-3 M⊙, and with an effective temperature and luminosity in agreement with the Hubble Space Telescope (HST) pre-explosion observations of SN 2011dh. These results are nearly insensitive to the adopted accretion efficiency factor β. At the time of explosion, the companion star has an effective temperature of 22,000-40,000 K, depending on the value of β, and lies near the zero-age main sequence. Considering the uncertainties in the HST pre-SN photometry, the secondary star is only marginally detectable in the bluest observed band. CBSs, as opposed to single stars, provide a natural frame to explain the properties of SN 2011dh. © 2013. The American Astronomical Society. All rights reserved.. Source

Discover hidden collaborations