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A tale of one city: intra-institutional variations in migrating VLE platform
City University London committed in 2009 to make Moodle the Virtual Learning Environment (VLE) at the core of a new Strategic Learning Environment (SLE) comprised of VLE, externally facing website and related systems such as video streaming and virtual classrooms. Previously, the WebCT VLE had been separate from most of the other systems at the institution with very limited connections to other tools. Each of the schools within the institution was able to pursue their own strategy and timeframe for the migration and embedding of Moodle within their subject areas, within an absolute limit of 2 years. This paper outlines the approaches taken by the various schools, highlighting similarities and differences, and draws out common aspects from the project to make recommendations for institutions seeking to undertake similar migrations
A Gapless, Unambiguous Genome Sequence of the Enterohemorrhagic Escherichia coli O157:H7 Strain EDL933.
Escherichia coli EDL933 is the prototypic strain for enterohemorrhagic E. coli serotype O157:H7, associated with deadly food-borne outbreaks. Because the publicly available sequence of the EDL933 genome has gaps and >6,000 ambiguous base calls, we here present an updated high-quality, unambiguous genome sequence with no assembly gaps
The Onset of Chaos in Pulsating Variable Stars
Random changes in pulsation period occur in cool pulsating Mira variables,
Type A, B, and C semiregular variables, RV Tauri variables, and in most
classical Cepheids. The physical processes responsible for such fluctuations
are uncertain, but presumably originate in temporal modifications of the
envelope convection in such stars. Such fluctuations are seemingly random over
a few pulsation cycles of the stars, but are dominated by the regularity of the
primary pulsation over the long term. The magnitude of stochasticity in
pulsating stars appears to be linked directly to their dimensions, although not
in simple fashion. It is relatively larger in M supergiants, for example, than
in short-period Cepheids, but is common enough that it can be detected in
visual observations for many types of pulsating stars. Although chaos was
discovered in such stars 80 years ago, detection of its general presence in the
group has only been possible in recent studies.Comment: To appear in the proceedings of the Odessa Variable Stars 2010
Conference (see http://uavso.org.ua/?page=vs2010&lang=en), edited by I.
Andronov and V. Kovtyuk
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