New records of Trichinella patagoniensis from Argentina.

Trichinella spiralis was long considered the sole Trichinella species in Argentina. However, since 2004, various Trichinella species, including the encapsulated Trichinella patagoniensis and Trichinella britovi, as well as the unencapsulated Trichinella pseudospiralis, have been detected in the country. The present study aimed to identify Trichinella ML at the species level from cougars naturally infected from Argentina. To this end, muscle tissue samples from one cougar each from Córdoba, Neuquén, and Santa Cruz Provinces were individually analysed using the artificial digestion technique. DNA extraction and molecular identification of Trichinella species were conducted on individual muscle larvae by PCR amplification of the ESV region and subsequent PCR amplification and sequencing of the COI gene. Morphological analysis revealed muscle larvae with characteristics consistent with Trichinella genus. PCR revealed a single band of approximately 127 bp for each individual muscle larva. PCR amplification of the COI gene from each isolate generated a 309 bp band. Sequencing of the mitochondrial COI gene confirmed the identity of the parasite as T. patagoniensis. The present study documents new occurrences of T. patagoniensis in Puma concolor from Argentina, including the first detection of T. patagoniensis in Puma concolor from Córdoba and Neuquén Province. These findings expand the limited knowledge of T. patagoniensis distribution in Argentina.

Electron Glass Phase with Resilient Zhang-Rice Singlets in LiCu_{3}O_{3}.

LiCu_{3}O_{3} is an antiferromagnetic mixed valence cuprate where trilayers of edge-sharing Cu(II)O (3d^{9}) are sandwiched in between planes of Cu(I) (3d^{10}) ions, with Li stochastically substituting Cu(II). Angle-resolved photoemission spectroscopy (ARPES) and density functional theory reveal two insulating electronic subsystems that are segregated in spite of sharing common oxygen atoms: a Cu d_{z^{2}}/O p_{z} derived valence band (VB) dispersing on the Cu(I) plane, and a Cu 3d_{x^{2}-y^{2}}/O 2p_{x,y} derived Zhang-Rice singlet (ZRS) band dispersing on the Cu(II)O planes. First-principle analysis shows the Li substitution to stabilize the insulating ground state, but only if antiferromagnetic correlations are present. Li further induces substitutional disorder and a 2D electron glass behavior in charge transport, reflected in a large 530 meV Coulomb gap and a linear suppression of VB spectral weight at E_{F} that is observed by ARPES. Surprisingly, the disorder leaves the Cu(II)-derived ZRS largely unaffected. This indicates a local segregation of Li and Cu atoms onto the two separate corner-sharing Cu(II)O_{2} sub-lattices of the edge-sharing Cu(II)O planes, and highlights the ubiquitous resilience of the entangled two hole ZRS entity against impurity scattering.

Cu-based thin rolled foils: relationship among alloy composition, micromechanical and antiviral properties against SARS-CoV-2.

The healthcare-associated infections (HAIs) and pandemics caused by multidrug-resistant (MDR) and new-generation pathogens threaten the whole world community. Cu and its alloys have been attracting widespread interest as anti-contamination materials due to the rapid inactivation of MDR-superbugs and viruses. Applying thin Cu-based foils on pre-existing surfaces in hygiene-sensitive areas represents a quick, simple, cost-effective self-sanitising practice. However, the influence of chemical composition and microstructure should be deeply investigated when evaluating the antimicrobial capability and durability of Cu-based materials. The effect of composition on micromechanical and antiviral properties was investigated by comparing Cu15Zn and Cu18Ni20Zn (foil thickness from 13 to 27 µm) with Phosphorous High-Conductivity (PHC) Cu. The influence of recrystallisation annealing of PHC Cu was also investigated. Microstructural characterisation was carried out by optical (OM) and scanning electron (FEG-SEM) microscopy, Energy-dispersive Spectroscopy (EDS) and Electron-Backscattered Diffraction (EBSD). The micromechanical behaviour was assessed by microhardness, microscale abrasion and scratch tests. Cu-based foils were exposed to SARS-CoV-2 for different time points in quasi-dry conditions (artificial sweat solution), evaluating their antiviral capability by quantitative Reverse-Transcriptase Polymerase Chain Reaction (qRT-PCR). Surface morphology, contact angle measurements and Cu release were measured. All Cu-based surfaces completely inactivated SARS-CoV-2 in 10 min: pure Cu was the best option regarding antiviral efficiency, while Cu15Zn showed the best trade-off between micromechanical and antiviral properties.

Fate of Quasiparticles at High Temperature in the Correlated Metal Sr_{2}RuO_{4}.

We study the temperature evolution of quasiparticles in the correlated metal Sr_{2}RuO_{4}. Our angle resolved photoemission data show that quasiparticles persist up to temperatures above 200 K, far beyond the Fermi liquid regime. Extracting the quasiparticle self-energy, we demonstrate that the quasiparticle residue Z increases with increasing temperature. Quasiparticles eventually disappear on approaching the bad metal state of Sr_{2}RuO_{4} not by losing weight but via excessive broadening from super-Planckian scattering. We further show that the Fermi surface of Sr_{2}RuO_{4}-defined as the loci where the spectral function peaks-deflates with increasing temperature. These findings are in semiquantitative agreement with dynamical mean field theory calculations.

Enfermedad de Moyamoya / Moyamoya disease

Se presenta el caso de un paciente con hallazgos angiográficos característicos de enfermedad de Moyamoya: oclusión bilateral de la arteria carótida interna asociada a colateralización anómala (El Moyamoya) en regiones vecinas. El paciente sufrió una hemiplejía faciobraquicrural izquierda. La tomografía computarizada cerebral mostró un infarto frontal derecho de tipo limítrofe, probablemente de origen hemodinámico por oclusión carotídea derecha. Se agregó un síndrome de hemiinatención visual izquierda, vinculable a la lesión descripta y/o a isquemia parietal. La presencia de abundantes vasos Moyamoya, el compromiso isquémico y no hemorrágico y un estadio intermedio en la evolución de la enfermedad coinciden con las características de la enfermedad en los niños. Sin embargo, el fenómeno de "reconstrucción" electroencefalográfico no fue observado y se encontraron pseudoaneurismas en la arteriografía. Estos hallazgos son más típicos en el adulto. El paciente tenía antecedentes de infecciones en las vías aéreas superiores, frecuentes en esta enfermedad. La encéfalo-duro-arterio-sinangiosis puede constituir una terapéutica efectiva de la misma (AU)

Enfermedad de Moyamoya / Moyamoya disease

Se presenta el caso de un paciente con hallazgos angiográficos característicos de enfermedad de Moyamoya: oclusión bilateral de la arteria carótida interna asociada a colateralización anómala (El Moyamoya) en regiones vecinas. El paciente sufrió una hemiplejía faciobraquicrural izquierda. La tomografía computarizada cerebral mostró un infarto frontal derecho de tipo limítrofe, probablemente de origen hemodinámico por oclusión carotídea derecha. Se agregó un síndrome de hemiinatención visual izquierda, vinculable a la lesión descripta y/o a isquemia parietal. La presencia de abundantes vasos Moyamoya, el compromiso isquémico y no hemorrágico y un estadio intermedio en la evolución de la enfermedad coinciden con las características de la enfermedad en los niños. Sin embargo, el fenómeno de "reconstrucción" electroencefalográfico no fue observado y se encontraron pseudoaneurismas en la arteriografía. Estos hallazgos son más típicos en el adulto. El paciente tenía antecedentes de infecciones en las vías aéreas superiores, frecuentes en esta enfermedad. La encéfalo-duro-arterio-sinangiosis puede constituir una terapéutica efectiva de la misma