9,242 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
HPLC determination of theophylline and paracetamol in fresh and powdered milk
Poster presented at the 1st International Congress of CiiEM - From Basic Sciences to Clinical Research. 27-28 November 2015, Egas Moniz, Caparica, Portugal"Theophylline and paracetamol are drugs used worldwide both in human and veterinary medicine. Paracetamol (or acetaminophen) is employed as analgesic and antipyretic, and theophylline is a bronchodilator drug used in the treatment of asthma and chronic obstructive pulmonary disease. Both drugs are extensively used in pediatrics and their dosage is based on the child's body weight. Due to possible liver toxicity (paracetamol) and narrow therapeutic index (theophylline) it is imperative to carefully select and monitor the dose administered to children. Additionally, the recent proposal of milk as a platform to deliver drugs in pediatrics has prompted the development of a simple and sensitive high-performance liquid chromatography (HPLC) quantification method, of both theophylline and paracetamol, in the complex matrix that milk represents."Fundação para a Ciência e a Tecnologia (PTDC/DTP-FTO/1057/2012
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
Mudanças climáticas no Semiárido brasileiro: medidas de mitigação e adaptação.
O objetivo deste artigo é discutir os impactos das mudanças climáticas e medidas de mitigação e adaptação que já estão sendo executadas no Semiárido brasileiro. Os potenciais impactos negativos sobre os recursos hÃdricos e a agricultura de sequeiro poderão comprometer a população da região. Medidas de mitigação como o manejo correto do solo, a redução de emissão de metano em ruminantes, o manejo florestal da Caatinga, a integração lavoura-pecuária-floresta e a produção e uso de biocombustÃveis podem reduzir a emissão dos gases do efeito estufa. Medidas de adaptação como uso do melhoramento genético, a captação da água de chuva, adoção de novos sistemas produtivos, aproveitamento do potencial produtivo das plantas da Caatinga poderão contribuir para minimizar os efeitos das mudanças climáticas. A demanda por pesquisas nesse contexto continuará crescente, necessitando de esforços multidisciplinares, com a interação entre as instituições de pesquisa, a fim de definir métodos e estratégias para serem aplicados no Semiárido. A formulação de polÃticas públicas que incentivem a adoção destas práticas será imprescindÃvel para que as mesmas sejam colocadas em prática
Simple and sensitive HPLC determination of paracetamol and theophylline in fresh and powdered milk
Poster presented at the 10th World Meeting on Pharmaceutics, Biopharmaceutics and Pharmaceutical Technology. 4-7 April 2016, Glasgow, UKN/
Child-driven design of milk micelles for drug delivery
Poster presented at the 9th EuPFI Conference [European Paediatric Formulation Initiative], 19-21th Sep 2017, Warsaw, PolandN/
Milk as a drug delivery platform in paediatrics
Communication presented at the PSSRC − 9th Annual Symposium. 16-18 September 2015, Ghent, Belgium"Purpose: to assess the physical properties of spray dried milk powders and evaluate drug-milk interactions.
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