129 research outputs found
Características anatómicas del huevo de Haematopinus suis (Phthiraptera, Anoplura, Haematopinidae) y su relación con la resistencia frente a los factores agresivos del ambiente
Fil: Prieto, Olegario H.. Cátedra de Parasitología y enfermedades parasitarias de la Facultad de Ciencias Veterinarias. UBA; ArgentinaFil: Abrahamovich, Alberto H.. Laboratorio de Apidología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Cicchino, Armando Conrado. División Entomología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Nuñez, Jorge L.. Cátedra de Parasitología y enfermedades parasitarias de la Facultad de Ciencias Veterinarias. UBA; Argentin
Mosca de los cuernos, Haematobia irritans irritans (Linnaeus 1758) (Diptera: Muscidae). Contribuciones para su conocimiento en la Argentina. III. Aspectos morfológicos básicos de los estados preadultos. Ciclo biológico
Fil: Abrahamovich, Alberto H.. Laboratorio de Apidología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Cicchino, Armando Conrado. División Entomología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Prieto, Olegario H.. Cátedra de Parasitología y enfermedades parasitarias de la Facultad de Ciencias Veterinarias. UBA; ArgentinaFil: Torres, Pablo R.. Área de Parasitología y enfermedades parasitarias de la Facultad de Ciencias Veterinarias. UBA; ArgentinaFil: Nuñez, Jorge L.. Cátedra de Parasitología y enfermedades parasitarias de la Facultad de Ciencias Veterinarias. UBA; Argentin
Mosca de los cuernos, Haematobia irritans irritans (Linnaeus 1758) (Diptera: Muscidae). Contribuciones para su conocimiento en la Argentina. II. Estado adulto: dimorfismo sexual y diferenciación con otros múscidos hallados sobre el pelaje de los bovinos
Fil: Cicchino, Armando Conrado. División Entomología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Abrahamovich, Alberto H.. Laboratorio de Apidología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Torres, Pablo R.. Área de Parasitología y enfermedades parasitarias de la Facultad de Ciencias Veterinarias. UBA; ArgentinaFil: Nuñez, Jorge L.. Cátedra de Parasitología y enfermedades parasitarias de la Facultad de Ciencias Veterinarias. UBA; ArgentinaFil: Prieto, Olegario H.. Cátedra de Parasitología y enfermedades parasitarias de la Facultad de Ciencias Veterinarias. UBA; Argentin
Newcastle approach for the treatment of supra-intercondylar fractures in children
The aim of this study is to evaluate the functional results of open reduction using the Newcastle approach and internal fixation for complex intra-articular distal humeral fractures in children through the report of cases. A retrospective case series of patients who underwent open reduction and internal fixation surgery because of a complex intra-articular distal humeral fracture using the Newcastle approach were reviewed. Minimum follow-up was 2 years. Demographic, clinical, and radiological data were analyzed. Also, Mayo Elbow Performance Score and four-point Likert scale were evaluated. 2 children were included in the final analysis. In both fractures, the approach was sufficient for accurate reduction and the functional outcome on both elbows was satisfactory. The Mayo elbow score was 95 points (excellent results) and the five-point Likert scale, both patients were very satisfied with the outcomes. In the radiographic study, no necrosis or secondary deformities were observed. Our study provides evidence that the Newcastle approach is an alternative to perform open reduction in those children supra-intercondylar fractures that cannot be reduced using a close reduction. To our knowledge, there is not previous paper that has reported the used of this approach in the treatment in this kind of fractures
Outcome of Arthroscopic Treatment of Mucoid Degeneration of the Anterior Cruciate Ligament
Mucoid degeneration of the anterior cruciate ligament is a rare pathological entity. Several authors have identified this condition, described their experiences, and suggested their own guidelines for management. The aim of this study was to detail the clinical, radiological, arthroscopic, and pathological findings of mucoid degeneration of the anterior cruciate ligament and report the clinical outcomes following arthroscopic treatment. A historical cohort of patients who underwent arthroscopic total or partial excision of the anterior cruciate ligament due to mucoid degeneration between 2011 and 2014 were reviewed. The minimum follow-up was 3 years. Demographic, radiological, and histological findings, type of surgery, and clinical pre- and postoperative data were analyzed. The visual analogue scale score, the International Knee Documentation Committee score, and the Tegner Lysholm Knee Score were collected preoperatively, postoperatively, and during the follow-up period. Seventeen females (67%) and eight males (33%) were included in the final analysis. The mean age at the time of surgery was 57 years (range, 31 to 78 years). Partial resection of the anterior cruciate ligament was done in seven cases and a complete resection in 18 cases. No reconstruction was performed at the same time. A positive Lachman test and a negative pivot shift were noted after surgery in all cases. Anterior cruciate ligament reconstruction was required in only one young patient due to disabling instability. At last follow-up, the mean visual analogue scale score, International Knee Documentation Committee score, and Tegner Lysholm Knee score improved (p < 0.01). Our study provides further evidence that arthroscopic total or partial excision of anterior cruciate ligament is a safe and effective treatment for mucoid degeneration of the anterior cruciate ligament, improving patient satisfaction and function without causing clinical instability in daily activities. However, young patients should be forewarned about the risk of instability, and an anterior cruciate ligament reconstruction could be necessary
Onion-like Fe3O4/MgO/CoFe2O4 magnetic nanoparticles: new ways to control magnetic coupling between soft/hard phases
The control of the magnetization inversion dynamics is one of the main
challenges driving the design of new nanostructured magnetic materials for
magnetoelectronic applications. Nanoparticles with onion-like architecture
offer a unique opportunity to expand the possibilities allowing to combine
different phases at the nanoscale and also modulate the coupling between
magnetic phases by introducing spacers in the same structure. Here we report
the fabrication, by a three-step high temperature decomposition method, of
Fe3O4/MgO/CoFe2O4 onio-like nanoparticles and their detailed structural
analysis, elemental compositional maps and magnetic response. The
core/shell/shell nanoparticles present epitaxial growth and cubic shape with
overall size of (29+-6) nm. These nanoparticles are formed by cubic iron oxide
core of (22+-4) nm covered by two shells, the inner of magnesium oxide and the
outer of cobalt ferrite of ~1 and ~2.5 nm of thickness, respectively. The
magnetization measurements show a single reversion magnetization curve and the
enhancement of the coercivity field, from HC~608 Oe for the Fe3O4/MgO to
HC~5890 Oe to the Fe3O4/MgO/CoFe2O4 nanoparticles at T=5 K, ascribed to the
coupling between both ferrimagnetic phases with a coupling constant of =2
erg/cm2. The system also exhibits exchange bias effect, where the exchange bias
field increases up to HEB~2850 Oe at 5 K accompanied with the broadening of the
magnetization loop of HC~6650 Oe. This exchange bias effect originates from the
freezing of the surface spins below the freezing temperature TF=32 K that
pinned the magnetic moment of the cobalt ferrite shell.Comment: 39 pages, 8 figure
Efficient generation of highly crystalline carbon quantum dots via electrooxidation of ethanol for rapid photodegradation of organic dyes
Achieving versatile routes to generate crystalline carbon-based
nanostructures has become a fervent pursuit in photocatalysis-related fields.
We demonstrate that the direct electrooxidation of ethanol, performed on Ni
foam, yields ultra-small and highly crystalline graphene-like structures named
carbon quantum dots (CQDs). We perform simulations of various sp2 and sp3
domains in order to understand the optical properties of CQDs by accounting
their contribution as absorbance/luminescent centers in the overall optical
response. Experiments and simulations reveal that absorbance bands for
as-synthesized CQDs are dominated by small sp2 domains comprised of r7
aromatic-rings. After 48 h synthesis, the dispersion transition from yellow to
red, exhibiting new and red shifted absorbance bands. Furthermore, fluorescence
emission is governed by medium-sized sp 2 domains (with aromatic ring counts
r12) and oxygen-containing groups. These oxygen-rich groups within the CQDs,
confirmed by FT-IR and XPS, are responsible for the fast photodegradation of
organic dyes, with B90% of methylene blue (MB) being degraded within the first
5 min of light exposure. Our work provides crucial insights about the
electrochemical synthesis and overall optical properties of carbon
nanostructures, while being effective and reliable toward the degradation of
contaminants in water
Mosca de los cuernos, Haematobia irritans irritans (Linnaeus 1758) (Diptera: Muscidae). Contribuciones para su conocimiento en la Argentina. IV. Relaciones con los hospedadores
Fil: Prieto, Olegario H.. Cátedra de Parasitología y enfermedades parasitarias de la Facultad de Ciencias Veterinarias. UBA; ArgentinaFil: Torres, Pablo R.. Área de Parasitología y enfermedades parasitarias de la Facultad de Ciencias Veterinarias. UBA; ArgentinaFil: Abrahamovich, Alberto H.. Laboratorio de Apidología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Cicchino, Armando Conrado. División Entomología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Nuñez, Jorge L.. Cátedra de Parasitología y enfermedades parasitarias de la Facultad de Ciencias Veterinarias. UBA; Argentin
Geographic potential of the world’s largest hornet, Vespa mandarinia Smith (Hymenoptera: Vespidae), worldwide and particularly in North America
The Asian giant hornet (AGH, Vespa mandarinia) is the world’s largest hornet, occurring naturally in the Indomalayan region, where it is a voracious predator of pollinating insects including honey bees. In September 2019, a nest of Asian giant hornets was detected outside of Vancouver, British Columbia; multiple individuals were detected in British Columbia and Washington state in 2020; and another nest was found and eradicated in Washington state in November 2020, indicating that the AGH may have successfully wintered in North America. Because hornets tend to spread rapidly and become pests, reliable estimates of the potential invasive range of V. mandarinia in North America are needed to assess likely human and economic impacts, and to guide future eradication attempts. Here, we assess climatic suitability for AGH in North America, and suggest that, without control, this species could establish populations across the Pacific Northwest and much of eastern North America. Predicted suitable areas for AGH in North America overlap broadly with areas where honey production is highest, as well as with species-rich areas for native bumble bees and stingless bees of the genus Melipona in Mexico, highlighting the economic and environmental necessity of controlling this nascent invasion
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