910 research outputs found
A rare case of xanthogranuloma of the stomach masquerading as an advanced stage tumor
<p>Abstract</p> <p>Background</p> <p>Xanthogranuloma of the stomach is an extremely rare disease, and this lesion has only been found to coexist with early gastric cancer in 2 cases in the literature.</p> <p>Case presentation</p> <p>We report a case of xanthogranuloma of the stomach combined with early gastric cancer that mimicked an advanced stage tumor. A 65-year-old female was referred to our hospital because of epigastralgia. During a physical examination, a defined abdominal mass was palpable in the region of the left hypochondrium. Imaging studies revealed an advanced gastric cancer, which was suspected of having infiltrated the abdominal wall. Total gastrectomy and resection of the regional lymph node and abdominal wall were performed. Histopathologic examination of the resected specimen demonstrated xanthogranuloma combined with early gastric cancer.</p> <p>Conclusion</p> <p>Xanthogranuloma presenting as a form of SMT (submucosal tumor) of the stomach is an extremely rare disease, and diagnosing it preoperatively is difficult. Further accumulation and investigation of this entity is necessary.</p
Vulnerabilidad climĂĄtica de Puerto IguazĂș, Argentina: Camino hacia la adaptaciĂłn
Las ciudades ocupan un papel vital en el combate contra el cambio climĂĄtico. Su importancia como actores esenciales se basa en el hecho de que concentran gran parte de la actividad econĂłmica y se espera que alberguen a dos terceras partes de la poblaciĂłn del planeta para mediados de siglo. En este sentido, las acciones que las ciudades pueden realizar para enfrentar este desafĂo son significativas. Estas acciones incluyen esfuerzos para mitigar los efectos adversos del calentamiento global, asĂ como gestiones para protegerse y adaptarse a eventos climĂĄticos extremos, los cuales es probable que se tornen mĂĄs intensos y frecuentes en un futuro. Hasta el momento, la atenciĂłn se ha volcado predominantemente hacia las grandes metrĂłpolis, dejando a un lado las ciudades medianas y pequeñas, las cuales a menudo son las que registran los niveles de crecimiento mĂĄs altos y las que carecen de recursos de diversa Ăndole para hacer frente a este desafĂo. Bajo este contexto, el presente artĂculo se enfoca a examinar la vulnerabilidad climĂĄtica de Puerto IguazĂș, una ciudad argentina situada en la llamada regiĂłn de la "Triple Frontera", ya que comparte lĂmites territoriales con Ciudad del Este (Paraguay) y Foz do Iguaçu (Brasil). El anĂĄlisis se base en un enfoque de mĂ©todos mixtos. En tĂ©rminos cuantitativos, se desarrollĂł un Ăndice de Vulnerabilidad Urbana (IVU), el cual incluye 73 indicadores econĂłmicos, sociales, fĂsicos, climĂĄticos y ambientales, con el propĂłsito de cuantificar la sensitividad de la ciudad a eventos climĂĄticos extremos, asĂ como su capacidad para responder y adaptarse. En tĂ©rminos cualitativos, informaciĂłn derivada de entrevistas fue utilizada para complementar los hallazgos. Este estudio forma parte de la iniciativa Ciudades Resilientes al Clima (CRC) en AmĂ©rica Latina. El artĂculo, en este sentido, tambiĂ©n hace una reflexiĂłn sobre la experiencia de conducir un proyecto bajo dicha iniciativa, y sobre las lecciones que estos resultados ofrecen a otras ciudades en contextos similares en AmĂ©rica Latina
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Negative priming and occasion setting in an appetitive Pavlovian procedure
Rats received training in which two auditory target stimuli, X and Y, were signaled by two visual stimuli, A and B, and followed by food (i.e., AâX1, BâY+). The test consisted of presentations of X and Y preceded either by the same signal as during training (same trials: AâX, BâY) or by the alternative signal (different trials: AâY, BâX). After 8 training sessions, the animals responded less on same trials than on different trials; this effect was significantly reduced after 24 training sessions. In two additional experiments, animals that had also experienced presentations of A and B alone, either before or during training, showed the opposite pattern of results, responding more on same trials than on different trials. These results are interpreted as being due to the interaction between the effects of occasion setting andnegative priming (see Wagner, 1981)
First narrow-band search for continuous gravitational waves from known pulsars in advanced detector data
Spinning neutron stars asymmetric with respect to their rotation axis are potential sources of
continuous gravitational waves for ground-based interferometric detectors. In the case of known pulsars a
fully coherent search, based on matched filtering, which uses the position and rotational parameters
obtained from electromagnetic observations, can be carried out. Matched filtering maximizes the signalto-
noise (SNR) ratio, but a large sensitivity loss is expected in case of even a very small mismatch
between the assumed and the true signal parameters. For this reason, narrow-band analysis methods have
been developed, allowing a fully coherent search for gravitational waves from known pulsars over a
fraction of a hertz and several spin-down values. In this paper we describe a narrow-band search of
11 pulsars using data from Advanced LIGOâs first observing run. Although we have found several initial
outliers, further studies show no significant evidence for the presence of a gravitational wave signal.
Finally, we have placed upper limits on the signal strain amplitude lower than the spin-down limit for 5 of
the 11 targets over the bands searched; in the case of J1813-1749 the spin-down limit has been beaten for
the first time. For an additional 3 targets, the median upper limit across the search bands is below the
spin-down limit. This is the most sensitive narrow-band search for continuous gravitational waves carried
out so far
The Beta-decay Paul Trap Mk IV: Design and commissioning
The Beta-decay Paul Trap is an open-geometry, linear trap used to measure the
decays of Li and B to search for a tensor contribution to the weak
interaction. In the latest Li measurement of Burkey et al. (2022),
scattering was the dominant experimental systematic uncertainty. The Beta-decay
Paul Trap Mk IV reduces the prevalence of scattering by a factor of 4
through a redesigned electrode geometry and the use of glassy carbon and
graphite as electrode materials. The trap has been constructed and successfully
commissioned with Li in a new data campaign that collected 2.6 million
triple coincidence events, an increase in statistics by 30% with 4 times less
scattering compared to the previous Li data set.Comment: 17 pages, 7 figure
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