45 research outputs found
The Negishi Catalysis: Full Study of the Complications in the Transmetalation Step and Consequences for the Coupling Products
Impact of a COVID-19 Outbreak in an Elderly Care Home after Primary Vaccination
[EN] Elderly care home residents are particularly vulnerable to COVID-19 due to immunesenescence, pre-existing medical conditions, and the risk of transmission from staff and visitors.
This study aimed to describe the outcomes of a COVID-19 outbreak in a long-term care facility
for elderly persons following the initial vaccination. A single-center, retrospective, observational
design was used to analyze the variables associated with hospitalization and death rate by logistic
regression. Adjusted odds ratios (aOR) and their 95% confidence intervals (CI) were calculated.
Sixty-eight residents received the first dose of the COVID-19 vaccine. Despite being negative six days
after vaccination, the performance of a second test 4 days later revealed 51 positives (75.0%) among
residents and 18 among workers (56.3%). A total of 65 of the 68 residents (95.58%) had positive
results with symptoms, whereas 34.9% required hospitalization, and 25.8% died. The best-fitting
model to explain the distribution of cases reflects three points at the time of infection.. The time
from vaccination to symptom onset explains the hospitalization and mortality rates since a day
elapsed halves the risk of hospitalization (aOR = 0.57; CI = 0.38−0.75) and the risk of death by a
quarter (aOR = 0.74; CI = 0.63−0.88). Nursing homes present an elevated risk of transmission and
severity of SARS-CoV-2 infection. Although vaccination reduces the risk of hospitalization and
death, extreme prevention and control measures are essential in these institutions despite the high
vaccination coverage.S
Black Hole Astrophysics in AdS Braneworlds
We consider astrophysics of large black holes localized on the brane in the
infinite Randall-Sundrum model. Using their description in terms of a conformal
field theory (CFT) coupled to gravity, deduced in Ref. [1], we show that they
undergo a period of rapid decay via Hawking radiation of CFT modes. For
example, a black hole of mass would shed most of its
mass in years if the AdS radius is mm,
currently the upper bound from table-top experiments. Since this is within the
mass range of X-ray binary systems containing a black hole, the evaporation
enhanced by the hidden sector CFT modes could cause the disappearance of X-ray
sources on the sky. This would be a striking signature of RS2 with a large AdS
radius. Alternatively, for shorter AdS radii, the evaporation would be slower.
In such cases, the persistence of X-ray binaries with black holes already
implies an upper bound on the AdS radius of L \la 10^{-2} mm, an order of
magnitude better than the bounds from table-top experiments. The observation of
primordial black holes with a mass in the MACHO range and an age comparable to the age of the universe would further
strengthen the bound on the AdS radius to L \la {\rm few} \times 10^{-6} mm.Comment: 14 pages, latex, no figures v2: added reference
The rms-flux relations in different branches in Cyg X-2
In this paper, the rms-flux (root mean square-flux) relation along the
Z-track of the bright Z-Source Cyg X-2 is analyzed using the observational data
of Rossi X-ray Timing Explorer (RXTE). Three types of rms-flux relations, i.e.
positive, negative, and 'arch'-like correlations are found in different
branches. The rms is positively correlated with flux in normal branch (NB), but
anti-correlated in the vertical horizontal branch (VHB). The rms-flux relation
shows an 'arch'-like shape in the horizontal branch (HB). We also try to
explain this phenomenon using existing models.Comment: Accepted for publication in Astrophysics & Space Scienc
Avaliação ultrassonográfica do aparelho reprodutor em serpentes vivíparas da família Boidae
Ultrasonographic and radiographic determination of egg development of jurarás (Kinosternon scorpioides) in captivity
International nosocomial infection control consortium (INICC) report, data summary of 36 countries, for 2004-2009
The results of a surveillance study conducted by the International Nosocomial Infection Control Consortium (INICC) from January 2004 through December 2009 in 422 intensive care units (ICUs) of 36 countries in Latin America, Asia, Africa, and Europe are reported. During the 6-year study period, using Centers for Disease Control and Prevention (CDC) National Healthcare Safety Network (NHSN; formerly the National Nosocomial Infection Surveillance system [NNIS]) definitions for device-associated health care-associated infections, we gathered prospective data from 313,008 patients hospitalized in the consortium's ICUs for an aggregate of 2,194,897 ICU bed-days. Despite the fact that the use of devices in the developing countries' ICUs was remarkably similar to that reported in US ICUs in the CDC's NHSN, rates of device-associated nosocomial infection were significantly higher in the ICUs of the INICC hospitals; the pooled rate of central line-associated bloodstream infection in the INICC ICUs of 6.8 per 1,000 central line-days was more than 3-fold higher than the 2.0 per 1,000 central line-days reported in comparable US ICUs. The overall rate of ventilator-associated pneumonia also was far higher (15.8 vs 3.3 per 1,000 ventilator-days), as was the rate of catheter-associated urinary tract infection (6.3 vs. 3.3 per 1,000 catheter-days). Notably, the frequencies of resistance of Pseudomonas aeruginosa isolates to imipenem (47.2% vs 23.0%), Klebsiella pneumoniae isolates to ceftazidime (76.3% vs 27.1%), Escherichia coli isolates to ceftazidime (66.7% vs 8.1%), Staphylococcus aureus isolates to methicillin (84.4% vs 56.8%), were also higher in the consortium's ICUs, and the crude unadjusted excess mortalities of device-related infections ranged from 7.3% (for catheter-associated urinary tract infection) to 15.2% (for ventilator-associated pneumonia). Copyright © 2012 by the Association for Professionals in Infection Control and Epidemiology, Inc. Published by Elsevier Inc. All rights reserved
Síntesis de redes de intercambiadores. Análisis comparativo de dos procedimientos basados en la programación lineal
En el proceso de determinación de redes de intercambiadores de calor, las técnicas empleadas habitualmente exigen una primera etapa de determinación de la Máxima Energía Recuperable. Para ello, se han descrito diversas técnicas basadas en métodos termodinámicos como el procedimiento de la tabla del problema (Pinch), y métodos matemáticos que empleando el modelo de transporte en etapas, se resuelven utilizando el método Simplex para Redes o el método Out of Kilter (OKA), basados en técnicas de programación lineal. El método de la tabla del problema presenta ventajas obvias desde el punto de vista expositivo; sin embargo, de cara a la generalización del mismo con inclusión de utilidades externas múltiples, resulta de difícil adaptación. Los métodos matemáticos, por su parte, aunque de mayor complejidad en su planteamiento, permiten abordar la inclusión de utilidades múltiples con modificaciones mínimas. A fin de explorar las posibilidades de dos de las técnicas matemáticas más actuales y exponer los resultados de su aplicación, se presenta el actual trabajo
Implementación de un programa de habilidades sociales y emocionales para personas con miastenia
Implementation of a program of social and emotional skills for people with myasthenia. The aim of this study was to evaluate the efficacy of a program for persons with myasthenia. The participants were 56 adults diagnosed of myasthenia. The Program was applied on line, during eleven weeks; this program works on assertiveness, communication, social skills, resilience and emotional intelligence. A single group was used with pre and post intervention. At post-treatment, different aspects related with the quality of life of the patients showed significant improvement, anxiety diminished and social skills increase. Besides, the program proved useful for both men and women at any age. These results initially endorsed the efficacy of the program employed and support psychosocial intervention with these patient