Teste Repositóri
2014-01-01
Resultados de pesquisa
Foram encontrados 21 registos.
Pressure-assisted thermal processing (PATP) at T < 100°C can be used when enzyme inactivation and pasteurization by high pressure processing (HPP) is not feasible due to long processing times while PATP at T > 100°C can be used when bacterial spores inactivation is necessary. In PATP, the adiabatic compression/decompression heat increases/decreases temperature almost instantaneously, and the simultaneous application of high pressure (~600–700 MPa) and temperature (~100–120°C) accelerates spore inactivation. PATP effects on chemical changes are analyzed using a reaction kinetics approach including activation volume (V a) and activation energy (E a) values. Reaction rates increase or decrease with pressure for negative or positive V a values, respectively, while rate temperature and pressure sensitivity depends on the magnitude of E a an...
RESUMO
Introdução: A hidropisia fetal define-se por uma acumulação anormal de
fluído intersticial no feto. Descrita inicialmente
como uma entidade patológica
única, Ballantyne em 1892 levantou a
hipótese de representar um estado final
comum a uma variedade de processos
patológicos diferentes. Potter distingue
2 tipos: imune (mais frequente na era
prévia à utilização da RhoGAM) e não
imune (implicada actualmente em cerca
de 90% dos casos). Apesar de todos os
avanços de diagnóstico, a hidropisia fetal
continua a ser uma entidade desafiante
na medicina perinatal. O objectivo deste
estudo foi analisar os casos de hidropisia
fetal numa Unidade de Cuidados Intensivos
Neonatais (UCIN), para avaliação de
etiologia, morbilidade e mortalidade.
Pacientes e métodos: Os autores
apresentam cinco casos de hidropisia fetal
tratado...
The use of some fish parasites as bioindicators of heavy metal pollution has been demonstrated as particularly adequate due to their capacity of bioconcentration. This study evaluated the effect of Proteocepholus macrocephalus on the accumulation of trace elements in the edible fish, Anguilla anquilla, in a contaminated area in Portugal (Ria de Aveiro). Also, the model P. macrocephalus/A. anquilla was assessed as a bioindicator system in the presence of the highly prevalent nematode Anguillicola crassus. Samples (kidney, liver, muscle, A. crassus and P. macrocephalus) of 20 eels harbouring A. crassus and another 20 harbouring both A. crassus and P. macrocephalus were selected for element analysis by ICP-MS. The highest concentrations of Cr, Ni and Zn were detected in P. macrocephalus. However, there was a higher liver and muscle Cr con...
The present study provides the first data on inorganic element levels in juvenile, subadult, and adult Atlantic gannets (Morus bassanus). Physiological and potentially toxic elements (As, Cd, Co, Cr, Cu, Hg, Mn, Pb, Se, and Zn) were assessed by ICP-MS in kidney, liver, muscle, and feathers of 31 gannets, including 18 juveniles, 7 subadults, and 6 adults. The effect of age and tissue on element accumulation was also assessed. Mercury was roughly above the minimum level for adverse effects in birds. A higher accumulation of Se and Cd was detected in kidney, Pb in feathers, and Mn in liver. Age was found to affect the accumulation of Cd, Co, Hg, Mn, Se, and Zn. Adults presented significantly lower levels of Mn, Se, and Zn than subadults. Linear positive relationships within tissues were detected involving Se-Cd and Se-Hg. Also, positive l...
The evolution in the treatment of metastatic prostate cancer currently provides to the urologist a wide range of therapeutic possibilities that have shown an improvement on overall survival and quality of life of patients. It is presented a clinical case in this article which reflects not only the effectiveness of these therapies but also their rapid evolution.
A evolução no tratamento do carcinoma da próstata metastizado proporciona atualmente ao Urologista uma vasta gama de possibilidades terapêuticas que comprovadamente melhoram a sobrevida e a qualidade de vida dos doentes. É apresentado um caso clínico neste artigo onde é patente não só a eficácia destas terapêuticas mas também a sua rápida evolução.
We analysed the viscera of 321 red foxes collected over the last 30 years in 34
of the 47 provinces of peninsular Spain, and identified their helminth
parasites. We measured parasite diversity in each sampled province using four
diversity indices: Species richness, Marg a l e f’s species richness index,
Shannon’s species diversity index, and inverse Simpson’s index. In order to
find geographical, environmental, and/or human-related predictors of fox
parasite diversity, we recorded 45 variables related to topography, climate,
lithology, habitat heterogeneity, land use, spatial situation, human activity,
sampling effort, and fox presence probability (obtained after environmental
modelling of fox distribution). We then performed a stepwise linear regression
of each diversity index on these variables, to find a minimal subset of
statistica...
The percutaneous access of the collecting system is one of the most challenging steps of the percutaneous
nephrolithotomy (PCNL). There are some limitations associated with the classical puncture guidance systems based on ultrasound or fluoroscopy.
The objective of this study was to describe a new ureteroscopy-assisted guidance technique for the kidney percutaneous access during PCNL and
the associated preliminary clinical outcomes: clinical applicability, time to puncture, number of necessary attempts and associated complications
