81 research outputs found
Differential effect of denervation on free radical scavenging enzymes in slow and fast muscle of rat
To determine the effect of denervation on the free radical scavenging systems in relation to the mitochondrial oxidative metabolism in the slow twitch soleus and fast twitch extensor digitorum longus (EDL) muscles, the sciatic nerve of the rat was crushed in the mid-thigh region and the muscle tissue levels of 5 enzymes were studied 2 and 5 weeks following crush. Radioimmunoassays were utilized for the selective measurement of cuprozinc (cytosolic) and mangano (mitochondrial) superoxide dismutases. These data represent the first systematic report of free radical scavening systems in slow and fast muscles in response to denervation. Selective modification of cuprozinc and manganosuperoxide dismutases and differential regulation of GSH-peroxidase was demonstrated in slow and fast muscle
Prevalence Rates of Mental Disorders in Chilean Prisons
PMCID: PMC371883
The search for the origin of the Local Bubble redivivus
We present a new unbiased search and analysis of all B stars in the solar
neighbourhood (within a volume of 400 pc diameter) using the Arivel data base
to track down the remains of the OB associations, which hosted the supernovae
responsible for the Local Bubble in the interstellar gas. We find after careful
dereddening and by comparison with theoretical isochrones, that besides the
Upper Scorpius the Upper Centaurus Lupus and Lower Centaurus Crux subgroups are
the youngest stellar associations in the solar neighbourhood with ages of 20 to
30 Myr, in agreement with previous work. In search for the ``smoking gun'' of
the origin of the Local Bubble, we have traced the paths of the associations
back into the past and found that they entered the present bubble region 10 to
15 Myr ago. We argue that the Local Bubble began to form then and estimate that
14 to 20 supernovae have gone off since. It is shown that the implied energy
input is sufficient to excavate a bubble of the presently observed size.Comment: 10 pages, 8 figures, accepted by Mon. Not. R. Astron. So
Signatures of star streams in the phase space distribution of nearby halo stars
We have analyzed the phase space distribution of a sample of about 900
non-kinematically selected low metallicity stars in the solar vicinity. The
stars primarily represent the thick disk and halo populations of the Milky Way.
We aim to identify overdensely populated regions in phase space, which we
interpret as signatures of star streams passing close to the Sun. The search was
conducted in a space constructed from the angular momenta and eccentricities of
the stellar orbits. Besides recovering all well known star streams in the thick
disk, we isolated four statistically significant phase space
overdensities amongst halo stars. One of them is associated with a previously
known halo star stream, but three of them are novel features, which we propose
be also considered as genuine halo streams
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