805 research outputs found
Field galaxies at intermediate redshift (0.2 < z < 0.8) in the direction of the galaxy cluster LCDCS-S001
We present spectroscopic and photometric analysis for eight field galaxies in
the direction of the galaxy cluster LCDCS-S001. The spectra were obtained with
the GMOS instrument in the Gemini South Observatory. The objects were selected
in an i' band image and the multi-object spectroscopic observations were
centered at 7500 A. For the galaxies ID 440 and ID 461 we have determined
redshifts of z=0.7464 and z=0.7465, respectively. For the other six galaxies we
have confirmed the redshift calculated by Rembold & Pastoriza (2006). The
redshifts of the field galaxies are in the range of 0.2201 < z < 0.7784. We
determined the blue and visual luminosities and they are brighter than
M_B=-18.64. The galaxies ID 180, ID 266, ID 461 follow the Faber-Jackson
relation of the Coma and Virgo early-type galaxies, and therefore do not
present a brightening of the B luminosity as observed in galaxies at higher
redshifts. The stellar velocity dispersion was measured for five galaxies and
estimated to be in the range of 200 < sigma < 346 km/s. Lick indices were
measured and used to determine the stellar population properties of galaxies ID
120 and ID 146, by means of spectral synthesis. The first galaxy, ID 120,
presents in its spectrum absorption and emission lines, and we have found that
the main contribution in the flux at lambda 5870 A is of a 0.1 Gyr stellar
population of solar metallicity. For ID 146, the dominant flux contribution at
lambda 4200 A, is provided by a stellar population of 10 Gyr of subsolar
metallicity. From stellar population synthesis we estimated reddening values of
E(B-V)=0.90 and E(B-V)=0.82 for ID 120 and ID 146, respectively. According to
classical diagnostic diagrams the emission lines present in the spectrum of ID
120 indicate that it is a starburst galaxy.Comment: Accepted for publication in Monthly Notices of the Royal
Astronomical. 6 Figures and 4 table
JOINT LOADING OF LOWER EXTREMITIES DURING NORDIC WALKING COMPARED TO WALKING BASED ON KINETIC AND KINEMATIC DATA
Based on a higher cardio-pulmonary and cardio-vascular benefit and a promised reduction of mechanical load of the musculoskeletal system Nordic Walking (NW) shows an increased market potential. The present study should investigate whether there are differences in joint loading of lower extremities using an inverse dynamics approach between NW and Walking. In this experiment 15 subjects participated, who were already experienced with the NW technique. Kinematic data were collected using a 6-camera 3-dimensional Vicon System. Kinetic data were recorded using a Kistler force plate. Based on the findings it is to summarize, that the use of the poles during NW, performing the diagonal technique, do not lead to a reduction of joint loading of the lower extremities compared to Walking in general. Moreover for NW a higher knee joint loading during landing could be observed which is caused by the specific NW technique
Determination of Flavonoids and Resveratrol in Wine by Turbulent-Flow Chromatography-LC-MS
Turbulent-flow chromatography (TFC) on-line coupled to liquid chromatography mass spectrometry (LC-MS) is used to determine flavonoids and resveratrol in different types of wines. A fully automated system was developed in which 10 mL of sample (diluted wine) was passed over a TFC column, after which the retained analytes were separated by reversed-phase LC and detected by negative ion mode atmospheric-pressure chemical ionization (APCI) MS. The method proved to be fast, non-laborious, robust and sensitive. The feasibility of the method was tested on several red, white and rose wines. Quantitation of resveratrol was possible using the standard addition procedure. Red wine showed the highest amount of resveratrol (4 mg
Evolution of the atomic component in protostellar outflows
We present SOFIA/FIFI-LS observations of three Class 0 and one Class I
outflows (Cep E, HH 1, HH 212, and L1551 IRS5) in the far-infrared [O I]63mum
and [O I]145mum transitions. Spectroscopic [O I]63mum maps enabled us to infer
the spatial extent of warm, low-excitation atomic gas within these protostellar
outflows. If proper shock conditions prevail, the instantaneous mass-ejection
rate is directly connected to the [O I]63mum luminosity. In order to unravel
evolutionary trends, we analysed a set of 14 Class 0/I outflow sources that
were spatially resolved in the [O I]63mum emission. We compared these data with
a sample of 72 Class 0/I/II outflow sources that have been observed with
Herschel (WISH, DIGIT, WILL, GASPS surveys) without spatially resolving the [O
I]63mum line.Comment: 14 pages, 7 figure
NACO/SAM observations of sources at the Galactic Center
Sparse aperture masking (SAM) interferometry combined with Adaptive Optics
(AO) is a technique that is uniquely suited to investigate structures near the
diffraction limit of large telescopes. The strengths of the technique are a
robust calibration of the Point Spread Function (PSF) while maintaining a
relatively high dynamic range. We used SAM+AO observations to investigate the
circumstellar environment of several bright sources with infrared excess in the
central parsec of the Galaxy. For our observations, unstable atmospheric
conditions as well as significant residuals after the background subtraction
presented serious problems for the standard approach of calibrating SAM data
via interspersed observations of reference stars. We circumvented these
difficulties by constructing a synthesized calibrator directly from sources
within the field-of-view. When observing crowded fields, this novel method can
boost the efficiency of SAM observations because it renders interspersed
calibrator observations unnecessary. Here, we presented the first NaCo/SAM
images reconstructed using this method.Comment: 8 pages, 10 figures, proceedings of the conference "Astrophysics at
High Angular Resolution" (AHAR-2011
Efeito da composição da dieta e suplementação com fitase sobre aspectos físicos da tíbia em frangos de corte.
Para avaliar o efeito do farelo de trigo e a suplementação de fitase sobrea resistência óssea, rigidez e flexibilidade da tíbia foram alojados em gaiolas metabólicas 384 pintos de corte, machos da linhagem Cobb, distribuídos em quatro tratamentos em um arranjo fatorial 2x2 em delineamento de blocos casualizados com oito repetições e 12 aves por unidade experimental. Os tratamentos foram: T1 -dieta basal (milho e farelo soja) sem fitase; T2 ?dieta basal com 500 FTU/kg de fitase; T3?20% farelo de trigo, sem fitase; T4 ?20% farelo de trigo, com 500 FTU/kg de fitase. Aos 22 e 32 dias de idade foram abatidas duas aves por unidade experimental para a retirada da tíbia e posterior análise. Aos 22 dias de idade os ossos apresentaram maior rigidez em aves alimentadas com dieta basal com e sem fitase. Maior resistência a quebra e flexibilidade foram encontradas somente para as aves que receberam dieta basal sem fitase. Aos 32 dias de idade as aves que receberam farelo de trigo apresentaram tíbias com maior rigidez que as aves que receberam dieta a base de farelo de soja e milho. To evaluate the effect of wheat meal and phytase supplementation on break strength, flexibility and rigidity of the tibia 384 broiler chicks, Cobb males were housed in metabolic cages and allotted to four treatments in a 2x2 factorial arrangement using a randomized block design with eight replicates of 12 birds per experimental unit. The treatments were: T1 -basal diet (corn and soybean meal without phytase), T2 -basal diet with 500 FTU/kg of phytase), T3 - 20% wheat meal without phytase and T4 - 20% wheat meal with 500 FTU/kg of phytase. At 22 and 32 days of age two birds per experimental unit were slaughtered for the withdrawal of the tibia for subsequent analysis. At 22 days of age, birds fed basal diet with and without phytase showed higher bone stiffness. Greater breaking strength and flexibility were found only for those birds receiving the basal diet without phytate. At 32days of age birds receiving 20% of wheat meal shown greater tibia rigidity than birds fed a corn-soybean meal -based diet
Estimating the detectable rate of capture of stellar mass black holes by massive central black holes in normal galaxies
The capture and subsequent inspiral of stellar mass black holes on eccentric
orbits by central massive black holes, is one of the more interesting likely
sources of gravitational radiation detectable by LISA. We estimate the rate of
observable events and the associated uncertainties. A moderately favourable
mass function could provide many detectable bursts each year, and a detection
of at least one burst per year is very likely given our current understanding
of the populations in cores of normal spiral galaxies.Comment: 3 pages 2-column revtex Latex macro. No figures. Classical and
Quantum Gravity, accepte
Efeito de fitase sobre o desempenho zootécnico de frangos de corte consumindo dietas com maior ou menor teor de fitato.
Alimentos alternativos estão sendo estudados com o intuito de buscar matérias-primas em substituição ao milho e farelo de soja, os quais estão escassos e com um alto valor no mercado. Destes, uma opção é o farelo de trigo que pode ser incluído na dieta de aves em pequenas proporções, em virtude do alto teor de fibra e outros fatores antinutricionais. Para minimizar estes fatores pode-se optar pela suplementação de fitase exógena para aumentar a degradação do fitato do farelo de trigo, sendo que esta melhoria permite que o alimento seja usado em níveis mais elevados, fornecendo proporções consideráveis de fósforo e outros minerais, reduzindo os custos com alimentação e a poluição ambiental (POURREZA & CLASSEN, 2001; CLASSEN & BEDFORD, 2001; KERR et al., 2010). Com isso, o objetivo deste trabalho foi avaliar o efeito do farelo de trigo e fitase sobre os parâmetros de desempenho zootécnico de frangos de corte de um a 32 dias de idade
Possible effect of dietary phytase supplementation on broiler sodium requirement.
Projeto/Plano de Ação: 11.11.11.111
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