Dev129304 3805..3809
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چکیده
Glia account for more than half of the cells in the mammalian nervous system, and the past few decades have witnessed a flood of studies that detail novel functions for glia in nervous system development, plasticity and disease. Here, and in the accompanying poster, we review the origins of glia and discuss their diverse roles during development, in the adult nervous system and in the context of
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ar X iv : a st ro - p h / 01 06 20 3 v 1 1 2 Ju n 20 01 CHANDRA observation of the narrow - line Seyfert 1 galaxy IRAS 13224 - 3809
The narrow-line Seyfert 1 galaxy (NLS1) IRAS 13224–3809 has been observed with the CHANDRA High Resolution Camera (HRC-I) for 12 ksec on February, 2, 2000. The source was proposed for CHAN-DRA observations to precisely determine the X-ray centroid position and to investigate the timing properties of the most X-ray variable Seyfert galaxy. The position derived from CHANDRA confirms that the X-ra...
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In the binary projective spaces PG(n,2) k-caps are called large if k > 2n−1 and small if k ≤ 2n−1. In this paper we propose new constructions producing infinite families of small binary complete caps.
متن کاملOn the Existence of Large Sets of t-designs of Prime Sizes
In this paper, we use the known recursive construction methods to obtain some new existence results for large sets of t-designs of prime sizes. We also present a new recursive construction which leads to more comprehensive theorems on large sets of sizes two and three. As an application, we show that for infinitely many values of block size, the trivial necessary conditions for the existence of...
متن کامل0 Evidence of Rapid Optical Variability In Selected Narrow - Line Seyfert 1 Galaxies
We present the first results of a search for the presence of rapid optical variability in a sample of five Narrow-Line Seyfert 1 galaxies. We find clear evidence of rapid variability for IRAS 13224-3809 with variations occurring on time scales of an hour. However, the results are less conclusive for the other four sources in our sample, Markarian 766, PG 1244+026, PG 1404+226 and Arakelian 564....
متن کاملRelativistic disc reflection in the extreme NLS 1 IRAS 13224 – 3809
We present a spectral variability study of the XMM-Newton and Suzaku observations of one of the most extreme Narrow Line Seyfert 1 galaxies, IRAS 13224–3809. The X-ray spectrum is characterized by two main peculiar features, i) a strong soft excess with a steep rise below about 1.3 keV and ii) a deep drop in flux above 8.2 keV. Although absorption–based interpretations may be able to explain th...
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