18,063 research outputs found
Speed of reaction diffusion in embryogenesis
Reaction diffusion systems have been proposed as mechanisms for patterning during many stages of embryonic development. While much attention has been focused on the study of the steady state patterns formed and the robustness of pattern selection, much less is known about the time scales required for pattern formation. Studies of gradient formation by the diffusion of a single morphogen from a localized source have shown that patterning can occur on realistic time scales over distances of a millimeter or less. Reaction diffusion has the potential to give rise to patterns on a faster time scale, since all points in the domain can act as sources of morphogen. However, the speed at which patterning can occur has hitherto not been explored in depth. In this paper, we investigate this issue in specific reaction diffusion models and address the question of whether patterning via reaction diffusion is fast enough to be applicable to morphogenesis
Complex pattern formation in reaction diffusion systems with spatially-varying parameters
Spontaneous pattern formation in reaction–diffusion systems on a spatially homogeneous domain has been well studied. However, in embryonic development and elsewhere, pattern formation often takes place on a spatially heterogeneous background. We explore the effects of spatially varying parameters on pattern formation in one and two dimensions using the Gierer–Meinhardt reaction–diffusion model. We investigate the effect of the wavelength of a pre-pattern and demonstrate a novel form of moving pattern. We find that spatially heterogeneous parameters can both increase the range and complexity of possible patterns and enhance the robustness of pattern selection
Anatomy of Creative Commons Licenses
In this presentation we will explore the anatomy of Creative Commons licenses through coming to understand six key areas. These areas are:
1.What is Creative Commons (CC)? 2.Three layers of the CC licenses 3.Four license elements and their icons 4.Six Creative Commons licenses 5.CC licenses affect on copyright exceptions and limitations 6.CC licenses affect on works in the public domai
Easy as 1,2,3: Create your own journal/ event pages with DigitalCommons@UNO
Creating a journal or event page with DigitalCommons is as easy as 1,2,3! Journal/ event pages on DigitalCommons@UNO possess similar features. These features help you to:
•Create more impact •Create opportunities for outreach •Save time on administrative task
Using Creative Commons Licenses and Creative Commons Licensed Works
Understanding the difference between collections and derivative works is key to your reuse and adaptation of existing material. It is often useful to create collections and derivative works for educational purposes; for instance, you may wish to compile a collection of articles or adapt an existing educational source to serve as a course text. However, it is not always possible to do both or any, depending on copyright restrictions. This presentation will guide your use and re-use of material that hold a Creative Commons license. In this presentation we will answer the questions What are collections and what are derivative works? We will also provide examples of collections and derivative works, along with providing tools for how to navigate reuse with the adapter\u27s license chart and the license compatibility chart
What is Creative Commons?
What is Creative Commons? is a presentation discussing the background and purpose of Creative Commons
Investing in Knowledge: The Benefits of an Open Access Fund
This presentation will discuss the strengths and weaknesses of the University of Nebraska at Omaha Open Access Fund through analysis of the disciplinary diversity of applicants, eligibility guidelines, funding limit and the benefits of publishing Open Access. Furthermore, it will seek to discover ways to increase participation in the Open Access Fund and by extension, the institutional repository, through comparison with other universities’ OA funds
A NuSTAR observation of the fast symbiotic nova V745 Sco in outburst
The fast recurrent nova V745 Sco was observed in the 3-79 keV X-rays band
with NuSTAR 10 days after the optical discovery. The measured X-ray emission is
consistent with a collisionally ionized optically thin plasma at temperature of
about 2.7 keV. A prominent iron line observed at 6.7 keV does not require
enhanced iron in the ejecta. We attribute the X-ray flux to shocked
circumstellar material. No X-ray emission was observed at energies above 20
keV, and the flux in the 3-20 keV range was about 1.6 10 erg
cm s. The emission measure indicates an average electron density
of order of 10 cm.
The X-ray flux in the 0.3-10 keV band almost simultaneously measured with
Swift was about 40 times larger, mainly due to the luminous central supersoft
source emitting at energy below 1 keV. The fact that the NuSTAR spectrum cannot
be fitted with a power law, and the lack of hard X-ray emission, allow us to
rule out Comptonized gamma rays, and to place an upper limit of the order of
10 erg cm s on the gamma-ray flux of the nova on the
tenth day of the outburst.Comment: in press in Monthly Notices of the Royal Astronomical Society, 201
Unifying Parsimonious Tree Reconciliation
Evolution is a process that is influenced by various environmental factors,
e.g. the interactions between different species, genes, and biogeographical
properties. Hence, it is interesting to study the combined evolutionary history
of multiple species, their genes, and the environment they live in. A common
approach to address this research problem is to describe each individual
evolution as a phylogenetic tree and construct a tree reconciliation which is
parsimonious with respect to a given event model. Unfortunately, most of the
previous approaches are designed only either for host-parasite systems, for
gene tree/species tree reconciliation, or biogeography. Hence, a method is
desirable, which addresses the general problem of mapping phylogenetic trees
and covering all varieties of coevolving systems, including e.g., predator-prey
and symbiotic relationships. To overcome this gap, we introduce a generalized
cophylogenetic event model considering the combinatorial complete set of local
coevolutionary events. We give a dynamic programming based heuristic for
solving the maximum parsimony reconciliation problem in time O(n^2), for two
phylogenies each with at most n leaves. Furthermore, we present an exact
branch-and-bound algorithm which uses the results from the dynamic programming
heuristic for discarding partial reconciliations. The approach has been
implemented as a Java application which is freely available from
http://pacosy.informatik.uni-leipzig.de/coresym.Comment: Peer-reviewed and presented as part of the 13th Workshop on
Algorithms in Bioinformatics (WABI2013
- …