11,859 research outputs found
Imagery and long-slit spectroscopy of the Polar-Ring Galaxy AM2020-504
Interactions between galaxies are very common. There are special kinds of
interactions that produce systems called Polar Ring Galaxies (PRGs), composed
by a lenticular, elliptical, or spiral host galaxy, surrounded by a ring of
stars and gas, orbiting in an approximately polar plane. The present work aims
to study AM2020-504, a PRG with an elliptical host galaxy, and a narrow and
well defined ring, probably formed by accretion of material from a donor
galaxy, collected by the host galaxy. Our observational study was based on BVRI
broad band imagery as well as longslit spectroscopy in the wavelenght range
4100--8600\AA, performed at the 1.6m telescope at the Observat\'orio do Pico
dos Dias (OPD), Brazil. We estimated a redshift of z= 0.01683, corresponding a
heliocentric radial velocity of 5045 +/-23 km/s. The (B-R) color map shows that
the ring is bluer than the host galaxy, indicating that the ring is a younger
structure. Standard diagnostic diagrams were used to classify the main ionizing
source of selected emission-line regions (nucleus, host galaxy and ring). It
turns out that the ring regions are mainly ionized by massive stars while the
nucleus presents AGN characteristics. Using two empirical methods, we found
oxygen abundances for the HII regions located in the ring in the range
12+log(O/H)=8.3-8.8 dex, the presence of an oxygen gradient across the ring,
and that AM2020-504 follows the metallicity-luminosity relation of spiral
galaxies. These results support the accretion scenario for this object and
rules out cold accretion as source for the HI gas in the polar ring
FM 047-02: a collisional pair of galaxies with a ring
Aims. We investigate the nature of the galaxy pair FM 047-02, which has been
proposed as an archetype of the Solitaire types of peculiar (collisional) ring
galaxies. Methods. The study is based on long-slit spectrophotometric data in
the range of 3500-9500 angstrons obtained with the Gemini Multi-ObjectComment: 07 pages, 06 figures, 02 tables. arXiv admin note: text overlap with
arXiv:1206.071
Case for diagnosis
Abstract
We report a clinical case of a rare variant of pemphigus - pemphigus herpetiformis - which combines the clinical features of dermatitis herpetiformis with the immunological findings of pemphigus. Due to its atypical presentation, it is frequently misdiagnosed as dermatitis herpetiformis. It is basically characterized by the herpetiform pattern of skin lesions, severe pruritus and by the presence of eosinophilic spongiosis confirmed on histopathology. We call attention to the excellent response to dapsone
Património geológico do Parque Nacional da Peneda-Gerês, valorização e divulgação para o ensino das geociências
Direcção Regional de Ensino do AlgarveComissão Nacional da UNESCO PortugalAutoridade Florestal Nacional (AFN)Ano Internacional das Florestas 201
Foscarnet-induced penile ulceration
Foscarnet is used to treat infections with herpes viruses, including drug-resistant cytomegalovirus
(CMV) and infections with herpes viruses 1 and 2 (HSV-1 and HSV-2). There are some reports of
intravenous foscarnet-induced penile and vulvar ulceration. The authors report a case of severe
penile ulcers after the initiation of intravenous foscarnet therap
Rituximab in the treatment of refractory pemphigus vulgaris
O pênfigo vulgar é uma doença bolhosa auto-imune rara, que atinge a pele e as mucosas. Geralmente tem um curso clínico severo, sendo necessário o recurso a terapêutica prolongada com corticóides sistémicos e outros fármacos imunossupressores, que podem conduzir a efeitos adversos graves. O rituximab é um anticorpo monoclo- nal quimérico dirigido ao antigénio CD20, expresso pelos linfócitos B. Recentemente, têm surgido alguns estudos que documentam o seu sucesso terapêutico no tratamento de pênfigo refractário. Os autores descrevem dois casos clínicos de pênfigo vulgar refractários às terapêuticas convencionais, que foram tratados com rituximab, tendo atin- gido a remissão completa da doença. A experiência bem sucedida em relação a estes dois casos clínicos reforça que o rituximab constitui uma opção valiosa e segura na abordagem terapêutica do pênfigo vulgar severo e refractário
Observation of an orbital interaction-induced Feshbach resonance in 173-Yb
We report on the experimental observation of a novel inter-orbital Feshbach
resonance in ultracold 173-Yb atoms, which opens the possibility of tuning the
interactions between the 1S0 and 3P0 metastable state, both possessing
vanishing total electronic angular momentum. The resonance is observed at
experimentally accessible magnetic field strengths and occurs universally for
all hyperfine state combinations. We characterize the resonance in the bulk via
inter-orbital cross-thermalization as well as in a three-dimensional lattice
using high-resolution clock-line spectroscopy.Comment: 5 pages, 4 figure
Adult mastocytosis: a review of the Santo António Hospital 's experience and an evaluation of World Health Organization criteria for the diagnosis of systemic disease
BACKGROUND:
Mastocytosis is a clonal disorder characterized by the accumulation of abnormal mast cells in the skin and/or in extracutaneous organs.
OBJECTIVES:
To present all cases of mastocytosis seen in the Porto Hospital Center and evaluate the performance of World Health Organization diagnostic criteria for systemic disease.
METHODS:
The cases of twenty-four adult patients with mastocytosis were reviewed. Their clinical and laboratorial characteristics were assessed, and the properties of the criteria used to diagnose systemic mastocytosis were evaluated.
RESULTS:
The age of disease onset ranged from 2 to 75 years. Twenty-three patients had cutaneous involvement and 75% were referred by dermatologists. Urticaria pigmentosa was the most common manifestation of the disease. One patient with severe systemic mast cell mediator-related symptoms showed the activating V560G KIT mutation. The bone marrow was examined in 79% of patients, and mast cell immunophenotyping was performed in 67% of the participants. Systemic disease was detected in 84% of cases, and 81% of the sample had elevated serum tryptase levels. All the diagnostic criteria for systemic mastocytosis had high specificity and positive predictive value. Bone marrow biopsy had the lowest sensitivity, negative predictive value and efficiency, while the highest such values were observed for mast cell immunophenotyping. Patients were treated with regimens including antihistamines, sodium cromoglycate, alpha-interferon, hydroxyurea and phototherapy.
CONCLUSIONS:
Cutaneous involvement is often seen in adult mastocytosis patients, with most individuals presenting with indolent systemic disease. Although serum tryptase levels are a good indicator of mast cell burden, bone marrow biopsy should also be performed in patients with normal serum tryptase, with flow cytometry being the most adequate method to diagnose systemic disease
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Dermatology inpatient consultation in a Portuguese university hospital
BACKGROUND: Cutaneous findings are frequent in hospitalized patients. There are few reports regarding this subject. OBJECTIVES: To identify the frequency and the impact on clinical courses of dermatologic conditions in patients in the inpatient setting and compare the data with other similar studies. METHODS: Retrospective review of 274 hospitalized patients in non-dermatology inpatient departments who were observed by a dermatology consultant in a Portuguese central university hospital during a year. RESULTS: A total of 282 consultations were performed. The services requesting consultation most frequently were internal medicine (33.7%), surgery (10.3%), and pediatrics (8.9%). Skin infections (33.2%), eczemas (9.5%), and drug eruptions (7.3%) were the most common diagnoses. Admission diagnosis was modified in 9 cases (3.3%) by the dermatology consultant. CONCLUSION: Dermatoses are frequently misdiagnosed by non-dermatologists. Common skin diseases were responsible for most of dermatology inpatient consultations. However, in some cases the dermatology consultation changed the primary main diagnosis and had an important impact on the clinical course
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