2,047 research outputs found
COST : action chemistry conference on supramolecular chemistry in water
Scientists and chemists from 18 countries gathered in Malta for the 3rd Scientific Meeting on Supramolecular Chemistry in Water between the 9 − 11th of November 2013 at the Old University Building on St Paul Street in Vallettapeer-reviewe
2015 researcher's mini-symposium
Postgraduate researchers from the Faculties of Science, Engineering, Medicine & Surgery and Health Sciences gathered for a forum to present their research interests. The symposium was held in the afternoon of 30
January 2015 in the Engineering Lecture Theatre.
The symposium promoted multi-disciplinary networking between various university faculties. Participants
were invited based on research topic diversity and
gender balance.peer-reviewe
Superintegrable Calogero-type systems admit maximal number of Poisson structures
We present a general scheme for constructing the Poisson structure of
super-integrable dynamical systems of which the rational Calogero-Moser system
is one of the most interesting one. This dynamical system is dimensional
with first integrals and our construction yields degenerate
Poisson tensors that each admit Casimirs. Our results are quite
generally applicable to all super-integrable systems and form an alternative to
the traditional bi-Hamiltonian approach
Medical diagnostics using designed molecules with sense and logic
Luminescent molecules responsive to cations, anions and even small molecules can be designed with the appropriate selectivity and sensitivity for monitoring physiological and pathological levels of analytes. We highlight some recent examples of designed molecules that can sense for a specific analyte or a combination of analytes in blood and in living cells. Furthermore, we demonstrate how molecules can be designed with built-in algorithms according to principles of Boolean logic to perform information processing. The potential future application of molecular systems able to perform multi-analyte sensing as `lab-on-a-molecule' systems for medical and environmental diagnostics is also presented.peer-reviewe
Separation of Coupled Systems of Schrodinger Equations by Darboux transformations
Darboux transformations in one independent variable have found numerous
applications in various field of mathematics and physics. In this paper we show
that the extension of these transformations to two dimensions can be used to
decouple systems of Schrodinger equations and provide explicit representation
for three classes of such systems. We show also that there is an elegant
relationship between these transformations and analytic complex matrix
functions.Comment: 14 page
Applications of Information Theory to Analysis of Neural Data
Information theory is a practical and theoretical framework developed for the
study of communication over noisy channels. Its probabilistic basis and
capacity to relate statistical structure to function make it ideally suited for
studying information flow in the nervous system. It has a number of useful
properties: it is a general measure sensitive to any relationship, not only
linear effects; it has meaningful units which in many cases allow direct
comparison between different experiments; and it can be used to study how much
information can be gained by observing neural responses in single trials,
rather than in averages over multiple trials. A variety of information
theoretic quantities are commonly used in neuroscience - (see entry
"Definitions of Information-Theoretic Quantities"). In this entry we review
some applications of information theory in neuroscience to study encoding of
information in both single neurons and neuronal populations.Comment: 8 pages, 2 figure
Self-assembly of multi-component fluorescent molecular logic gates in micelles
A recent strategy for developing supramolecular
logic gates in water is based on combinations
of molecules via self-assembly with surfactants, which
eliminates the need for time-consuming synthesis. The
self-assembly of surfactants and lumophores and receptors
can result in interesting properties providing cooperative
e ffects useful for molecular information processing
and other potential applications such as drug delivery
systems. This article highlights some of the recent advancements
in supramolecular information processing
using microheterogeneous media including micelles in
aqueous solution.peer-reviewe
On a class of dynamical systems both quasi-bi-Hamiltonian and bi-Hamiltonian
It is shown that a class of dynamical systems (encompassing the one recently
considered by F. Calogero [J. Math. Phys. 37 (1996) 1735]) is both
quasi-bi-Hamiltonian and bi-Hamiltonian. The first formulation entails the
separability of these systems; the second one is obtained trough a non
canonical map whose form is directly suggested by the associated Nijenhuis
tensor.Comment: 11 pages, AMS-LaTex 1.
Quasi-BiHamiltonian Systems and Separability
Two quasi--biHamiltonian systems with three and four degrees of freedom are
presented. These systems are shown to be separable in terms of Nijenhuis
coordinates. Moreover the most general Pfaffian quasi-biHamiltonian system with
an arbitrary number of degrees of freedom is constructed (in terms of Nijenhuis
coordinates) and its separability is proved.Comment: 10 pages, AMS-LaTeX 1.1, to appear in J. Phys. A: Math. Gen. (May
1997
Low-frequency local field potentials and spikes in primary visual cortex convey independent visual information
Local field potentials (LFPs) reflect subthreshold integrative processes that complement spike train measures. However, little is yet known about the differences between how LFPs and spikes encode rich naturalistic sensory stimuli. We addressed this question by recording LFPs and spikes from the primary visual cortex of anesthetized macaques while presenting a color movie.Wethen determined
how the power of LFPs and spikes at different frequencies represents the visual features in the movie.Wefound that the most informative LFP frequency ranges were 1– 8 and 60 –100 Hz. LFPs in the range of 12– 40 Hz carried little information about the stimulus, and may primarily reflect neuromodulatory inputs. Spike power was informative only at frequencies <12 Hz. We further quantified “signal
correlations” (correlations in the trial-averaged power response to different stimuli) and “noise correlations” (trial-by-trial correlations in the fluctuations around the average) of LFPs and spikes recorded from the same electrode. We found positive signal correlation between high-gamma LFPs (60 –100 Hz) and spikes, as well as strong positive signal correlation within high-gamma LFPs, suggesting that high-gamma LFPs and spikes are generated within the same network. LFPs<24 Hz shared strong positive noise correlations, indicating that they are influenced by a common source, such as a diffuse neuromodulatory input. LFPs<40 Hz showed very little signal and noise correlations with LFPs>40Hzand with spikes, suggesting that low-frequency LFPs reflect neural processes that in natural conditions are fully decoupled from those giving rise to spikes and to high-gamma LFPs
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