321 research outputs found
Performance of outdoor seawater treatment systems for recirculation in an intensive turbot (Scophthalmus maximus) farm
Water treatment systems are mandatory in recirculating aquaculture facilities facing existing regulations, but data on system efficiency, especially for marine species, are scarce. The present work aimed at contributing to the evaluation of the effluent characteristics and the performance of a combined outdoor biological and non-biological treatment system in an intensive turbot (Scophthalmus maximus) farm, operating under different hydraulic regimes. A preliminary study on the biofilter bacterial populations
was also undertaken. Changes in effluent characteristics with pumping, season of the year and fish biomass were observed. The treatment system showed performance instability under the conditions assayed (outdoors, changeable recycle rates). Maximum removal of solids was observed in winter, with microscreen or biological filtration (up to 60%) and nitrite removal (40â98%) was achieved with ozonation.
Reduction in ammonium levels was higher in summer, either mechanically (74%) or biologically (33%). Phosphate removal was higher in winter with both systems (37 and 60%, respectively). Compliance with Portuguese discharge standards was achieved. For improvements in the treatment loop, further studies on biofilter bacteria under outdoor conditions are needed, and biological denitrification is encouraged
Planothidum audax sp. nov. (Bacillariophyta, Achnanthidiaceae), a new diatom from temporary streams in southern Portugal
emporary streams represent ca. half of the river network at the worldwide level, and in regions such as southern Europe their dominance of the landscape is evident (Larned et al. 2010, McDonough et al. 2011, Barbosa et al. 2020). Currently, these streams are receiving increased attention due to their importance as high diversity spots for algae, arthropods, plants, etc., and due to the ecosystem services they provide (Acuña et al. 2014, Datry et al. 2018b). Because of their geographical position and the land use changes in their watersheds (increased urbanization, agriculture, etc.), climate change, contamination and habitat fragmentation constitute forces threatening their integrity and ecological characteristics (Datry et al. 2018a, Bonada et al. 2020)
MORFOGĂNESE DA PLANĂCIE ALUVIAL NA REGIĂO DA CONFLUĂNCIA ENTRE OS RIOS IVAĂ E PARANĂ E EVIDĂNCIA DE SUA PALEOCONFLUĂNCIA
O estudo apresenta a morfogĂȘnese e os estĂĄgios de evolução geomorfolĂłgica na planĂcie e confluĂȘncia dos rios IvaĂ e ParanĂĄ. InformaçÔes de sensoriamento remoto, anĂĄlise de fĂĄcies sedimentares e geocronologia foram utilizadas para compartimentação, e elucidam a evolução geomorfolĂłgica da planĂcie e confluĂȘncia. As analises demonstram compartimentos onde o abandono da drenagem do rio ParanĂĄ possibilitou a migração da confluĂȘncia e o leito encaixado e de maior profundidade do rio IvaĂ
Tuberculose disseminada com manifestaçÔes cerebrais, pulmonares, ganglionares e intestinais em raposas
Tuberculose disseminada com manifestaçÔes cerebrais, pulmonares, ganglionares e intestinais em raposas
Estudo da Variação IntradiĂĄria das ConcentraçÔes de PĂłlen de GramĂneas na Atmosfera de Portugal Continental
Introdução: O pĂłlen da famĂlia das Poaceae (gramĂneas) Ă© uma das principais fontes de aeroalergĂ©nios no mundo,
particularmente na Europa MediterrĂąnica. Representa, por isso, um importante factor de risco de asma, rinite e/ou conjuntivite
alérgica e constitui a principal causa de polinose em Portugal. Objectivo: Analisar a variação intradiåria das
concentraçÔes de pĂłlen de gramĂneas na atmosfera das 5 estaçÔes de monitorização continentais da Rede Portuguesa
de Aerobiologia (RPA): Porto, Coimbra, Lisboa, Ăvora e PortimĂŁo. MĂ©todos: Neste estudo utilizaram -se os dados diĂĄrios
e horĂĄrios das monitorizaçÔes de pĂłlen de gramĂneas das cinco estaçÔes de monitorização continentais da RPA, ao
longo de 7 anos (2002 -2008). Resultados: Entre as localidades encontraram -se diferenças significativas, em termos de
Estudo da variação intradiåria das
concentraçÔes de pĂłlen de gramĂneas
na atmosfera de Portugal Continental
O pĂłlen atmosfĂ©rico de gramĂneas constitui a
principal causa de rinite, asma, conjuntivite e
eczema nos indivĂduos alĂ©rgicos ao pĂłlen na
ĂĄrea MediterrĂąnica1,2, nomeadamente em Portugal3,4.
Dado que o pĂłlen, particularmente o pĂłlen de gramĂneas,
é um factor de risco para as doenças alérgicas
respiratĂłrias exercendo um impacto negativo sobre a
qualidade de vida dos indivĂduos sensibilizados, Ă© de
particular interesse, quer dos profissionais de saĂșde,
quer do doente conhecer a sua distribuição intradiåria,
ou seja a variação horåria das concentraçÔes de pólen
de gramĂneas ao longo do dia, de modo a adequar de
forma mais eficaz medidas de evicção e de intervenção
terapĂȘutica.
curvas horĂĄrias. O pĂłlen encontrou -se presente na atmosfera durante 24 horas em todas as localidades, e os valores
das concentraçÔes horårias variaram ao longo do dia e de ano para ano. As concentraçÔes mais baixas registaram -se
entre as 22 e as 6 horas e as mais elevadas, entre as 7 e as 21 horas, as quais em Ăvora ultrapassaram os 30 grĂŁos de
pólen/m3/hora. Em geral, registaram -se 2 picos de concentraçÔes måximas, um de manhã (9 -10 horas) ou à tarde (12 -13
horas) e outro no final da tarde / inĂcio da noite (19 -20 horas). ConclusĂ”es: O ritmo diurno difere muito de local para
local. Cada localidade tem o seu prĂłprio padrĂŁo de variação das concentraçÔes horĂĄrias do pĂłlen atmosfĂ©rico de gramĂneas
que se pode dever, quer às diferentes espécies presentes, quer às diferentes condiçÔes ambientais. O risco de
exposição variou de localidade para localidade e ao longo do dia, sendo o Porto a localidade onde este é menor, enquanto
Ăvora apresenta o maior risco
Diagnostic and therapeutic approach to cardioinhibitory reflex syncopeA complex and controversial issue
Syncope is defined as a transient loss of consciousness due to global cerebral hypoperfusion and is one of the leading causes of emergency department admission. The initial approach should focus on excluding nonâsyncopal causes for loss of consciousness and risk stratification for cardiac cause, in order to ensure an appropriate etiological investigation and therapeutic approach. Vasovagal syncope (VVS), the most common type of syncope, should be assumed once other causes are excluded. Pathophysiologically, the vasovagal reflex is the result of a paradoxical autonomic response, leading to hypotension and/or bradycardia. VVS has not been shown to affect mortality, but morbidity may be considerable in those with recurrent syncopal episodes. The management of VVS includes both nonâpharmacological and pharmacological measures that act on various levels of the reflex arc that triggers the syncopal episode. However, most are of uncertain benefit given the scarcity of highâquality supporting evidence. Pacemaker therapy may be considered in recurrent refractory cardioinhibitory reflex syncope, for which it is currently considered a robust intervention, as noted in the European guidelines. Nonârandomized and unblinded studies have shown a potential benefit of pacing in recurrent VVS, but doubleâblinded randomized controlled trials have not consistently demonstrated positive results. We performed a comprehensive review of the current literature and recent advances in cardiac pacing and pacing algorithms in VVS, and discuss the diagnostic and therapeutic approach to the complex patient with recurrent VVS and reduced quality of life.publishersversionpublishe
Inadequate use of antibiotics in the covid-19 era: effectiveness of antibiotic therapy
Background: Since December 2019, the COVID-19 pandemic has changed the concept of medicine. This work aims to analyze the use of antibiotics in patients admitted to the hospital due to SARS-CoV-2 infection. Methods: This work analyzes the use and effectiveness of antibiotics in hospitalized patients with COVID-19 based on data from the SEMI-COVID-19 registry, an initiative to generate knowledge about this disease using data from electronic medical records. Our primary endpoint was all-cause in-hospital mortality according to antibiotic use. The secondary endpoint was the effect of macrolides on mortality. Results: Of 13, 932 patients, antibiotics were used in 12, 238. The overall death rate was 20.7% and higher among those taking antibiotics (87.8%). Higher mortality was observed with use of all antibiotics (OR 1.40, 95% CI 1.21â1.62; p <.001) except macrolides, which had a higher survival rate (OR 0.70, 95% CI 0.64â0.76; p <.001). The decision to start antibiotics was influenced by presence of increased inflammatory markers and any kind of infiltrate on an x-ray. Patients receiving antibiotics required respiratory support and were transferred to intensive care units more often. Conclusions: Bacterial co-infection was uncommon among COVID-19 patients, yet use of antibiotics was high. There is insufficient evidence to support widespread use of empiric antibiotics in these patients. Most may not require empiric treatment and if they do, there is promising evidence regarding azithromycin as a potential COVID-19 treatment. © 2021, The Author(s)
Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment
This paper describes an analysis of the angular distribution of W->enu and
W->munu decays, using data from pp collisions at sqrt(s) = 7 TeV recorded with
the ATLAS detector at the LHC in 2010, corresponding to an integrated
luminosity of about 35 pb^-1. Using the decay lepton transverse momentum and
the missing transverse energy, the W decay angular distribution projected onto
the transverse plane is obtained and analysed in terms of helicity fractions
f0, fL and fR over two ranges of W transverse momentum (ptw): 35 < ptw < 50 GeV
and ptw > 50 GeV. Good agreement is found with theoretical predictions. For ptw
> 50 GeV, the values of f0 and fL-fR, averaged over charge and lepton flavour,
are measured to be : f0 = 0.127 +/- 0.030 +/- 0.108 and fL-fR = 0.252 +/- 0.017
+/- 0.030, where the first uncertainties are statistical, and the second
include all systematic effects.Comment: 19 pages plus author list (34 pages total), 9 figures, 11 tables,
revised author list, matches European Journal of Physics C versio
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