513 research outputs found
Radiative corrections to the Casimir effect for the massive scalar field
We compute the correction to the Casimir energy for the massive
model confined between a pair of parallel plates. The
calculations are made with Dirichlet and Neumann boundary conditions. The
correction is shown to be sensitive to the boundary conditions, except in the
zero mass limit, in which case our results agree with those found in the
literature.Comment: 6 pages. Work presented at the XXIII Brazilian National Meeting on
Particles and Fields (Aguas de Lindoia, Brazil, 15-19 Oct 2002). Also
available at http://www.sbf1.if.usp.br/eventos/enfpc/xxiii/procs/RES142.pd
Spillover events of rabbit haemorrhagic disease virus 2 (recombinant GI.4P-GI.2) from Lagomorpha to Eurasian badger
Áreas de pesquisa: Infectious Diseases ; Veterinary SciencesRabbit haemorrhagic disease (RHD) is a major threat to domestic and wild
European rabbits. Presently, in Europe, the disease is caused mainly by Rabbit
haemorrhagic disease virus 2 (RHDV2/b or Lagovirus europaeus GI.2), the origin
of which is still unclear, as no RHDV2 reservoir hosts were identified. After the
RHDV2 emergence in 2010, viral RNA was detected in a few rodent species.
Furthermore, RHDV2 was found to cause disease in some hare species resembling
the disease in rabbits, evidencing the ability of the virus to cross the species barrier. In this study, through molecular, histopathologic, antigenic and morphological
evidences, we demonstrate the presence and replication of RHDV2 in Eurasian
badgers (Meles meles) found dead in the district of Santarém, Portugal, between
March 2017 and January 2020. In these animals, we further classify the RHDV2
as a Lagovirus europaeus recombinant GI.4P-GI.2. Our results indicate that Meles
meles is susceptible to RHDV2, developing systemic infection, and excreting the
virus in the faeces. Given the high viral loads seen in several organs and matrices,
we believe that transmission to the wild rabbit is likely. Furthermore, transmission
electron microscopy data show the presence of calicivirus compatible virions in
the nucleus of hepatocytes, which constitutes a paradigm shift for caliciviruses’
replication cycleinfo:eu-repo/semantics/publishedVersio
Impact of adding different concentrations of IGF-I and insulin to the semen extender on bull sperm quality post-cryopreservation
ABSTRACT This study aimed to evaluate the addition of different concentrations of IGF-I and insulin to egg yolk-based extender to improve bovine semen cryopreservation. Two experiments were developed to evaluate the effects of the additives in two commercial extenders, Botubov® (Experiment 1) and Triladyl® (Experiment 2), both with the same design. Three ejaculates from four bulls (n = 12) were used. Each ejaculate was divided into seven equal fractions for dilution (60x106 spermatozoa/mL) in the following treatments: CON: extender only; IGF100: IGF-I 100ng/mL; IGF200: IGF-I 200ng/mL; INS150: insulin 150µUI/mL; INS200: insulin 200µUI/mL; ASS1: IGF-I 100ng/mL + insulin 150µUI/mL; ASS2: IGF-I 200ng/mL + insulin 200µUI/mL. Semen was cryopreserved by an automated system. Post-thawed sperm were evaluated regarding motility by CASA (Computer-assisted sperm analysis), and membranes by fluorescent probes (H342, PI, FITC-PSA and JC-1). For Botubov® extender, INS150 was more efficient in preserving total and progressive motility, VCL, BCF, plasma and mitochondrial membranes. A similar response was seen when insulin was added to the Triladyl® extender, INS150 was more efficient in preserving sperm motility, plasma membrane integrity and mitochondrial potential. Thus, the addition of insulin 150µUI/mL, regardless of the composition of the extender, contributes to better preserving bovine sperm from the cryopreservation effects
Methodology adjustments for organic acid tolerance studies in oat under hydroponic systems
Fish associated with aquatic macrophytes in the Chacororé-Sinhá Mariana Lake system and Mutum River, Pantanal of Mato Grosso, Brazil
Análise numérica-experimental de treliças tubulares planas para coberturas padronizadas para grandes vãos
Death of two slender-billed parakeet (King) (Enicognathus leptorhynchus) (Aves, Psittacidae) by Ascaridia hermaphrodita (Froelich, 1789, Railliet & Henry, 1914) at the National Zoo of Santiago, Chile
Computed tomography image of the mediastinal and axillary lymph nodes in clinically sound Rottweilers
Commentaire ECJ TF 3/2021 de l'arrêt de la CJUE du 19 mars 2021 dans l'affaire MK v. Autoridade Tributária e Aduaneira (Case C-388/19) concernant l'option des contribuables pour éviter une taxation discriminatoire des plus-values
peer reviewedIn this CFE opinion statement, the CFE ECJ Task Force comments on the ECJ decision in MK v. Autoridade Tributária e Aduaneira (Case C-388/19) of 18 March 2021. The Court confirmed its previous case law and held that the Portuguese (optional) regime for taxation of capital gains from immovable property of non-residents was contrary to the free movement of capital under article 63 of the TFEU since non-residents were taxed less favourably than residents
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