5,966 research outputs found
The differential diagnosis of chorea
Chorea is a hyperkinetic movement disorder characterised by excessive spontaneous movements that are irregularly timed, randomly distributed and abrupt. In this article, the authors discuss the causes of chorea, particularly Huntington's disease and the genetic syndromes that may resemble it, including HDL1-3, inherited prion disease, spinocerebellar ataxias 1, 3 and 17, neuroacanthocytosis, dentatorubro-pallidoluysian atrophy (DRPLA), brain iron accumulation disorders, Wilson's disease, benign hereditary chorea, Friedreich's ataxia and mitochondrial disease. Acquired causes of chorea include vascular disease, post-infective autoimmune central nervous system disorders (PANDAS), drugs, systemic lupus erythematosus, antiphospholipid syndrome, thyrotoxicosis, AIDS, chorea gravidarum, and polycythaemia rubra vera. The authors suggest an approach to the clinical assessment of chorea, the value of investigations, including genetic tests (for which they offer a structured framework highlighting the importance of prior counselling), and finally briefly discuss symptomatic drug treatment of chorea
Prion degradation pathways: Potential for therapeutic intervention
Prion diseases are fatal neurodegenerative disorders. Pathology is closely linked to the misfolding of native cellular PrP(C) into the disease-associated form PrP(Sc) that accumulates in the brain as disease progresses. Although treatments have yet to be developed, strategies aimed at stimulating the degradation of PrP(Sc) have shown efficacy in experimental models of prion disease. Here, we describe the cellular pathways that mediate PrP(Sc) degradation and review possible targets for therapeutic intervention. This article is part of a Special Issue entitled 'Neuronal Protein'
Hidden Interactions of Sterile Neutrinos As a Probe For New Physics
Recent results from neutrino experiments show evidence for light sterile
neutrinos which do not have any Standard Model interactions. In this work we
study the hidden interaction of sterile neutrinos with an "MeV scale" gauge
boson (the HI model) with mass and leptonic coupling .
By performing an analysis on the HI model using the data of the MINOS
neutrino experiment we find that the values above are excluded
by more than C.L., where is the Fermi constant and is the
field strength of the HI model. Using this model we can also probe other
new physics scenarios. We find that the region allowed by the
discrepancy is entirely ruled out for MeV. Finally, the
secret interaction of sterile neutrinos has been to solve a conflict between
the sterile neutrinos and cosmology. It is shown here that such an interaction
is excluded by MINOS for . This exclusion,
however, does depend on the value of .Comment: 11 pages, 2 figures, Improved version with new figures and further
details. Accepted in PR
Biomarkers for Huntington's disease: an update
Huntington's disease (HD) is a devastating autosomal-dominant neurodegenerative condition caused by a CAG repeat expansion in the gene encoding huntingtin which is characterised by progressive motor impairment, cognitive decline and neuropsychiatric disturbances. There are currently no disease-modifying treatments available to patients, but a number of therapeutic strategies are currently being investigated, chief among them are nucleotide-based 'gene silencing' approaches, modulation of huntingtin post-translation modification and enhancing clearance of the mutant protein. In 2008, the authors' review highlighted the need to develop and validate biomarkers and provided a systematic head-to-head comparison of such measures. They searched the PubMed database for publications, which covered each of the subheadings mentioned below. They identified from these list studies which had relevance to biomarker development, as defined in their previous review. Building on a tradition of collaborative research in HD, great advances have been made in the field since that time and a range of outcome measures are now being recommended in order to assess efficacy in future therapeutic trials
A method for solving systems of non-linear differential equations with moving singularities
We present a method for solving a class of initial valued, coupled,
non-linear differential equations with `moving singularities' subject to some
subsidiary conditions. We show that this type of singularities can be
adequately treated by establishing certain `moving' jump conditions across
them. We show how a first integral of the differential equations, if available,
can also be used for checking the accuracy of the numerical solution.Comment: 9 pages, 7 eps figures, to appear in Comput. Phys. Co
Future DUNE constraints on EFT
In the near future, fundamental interactions at high-energy scales may be
most efficiently studied via precision measurements at low energies. A
universal language to assemble and interpret precision measurements is the
so-called SMEFT, which is an effective field theory (EFT) where the Standard
Model (SM) Lagrangian is extended by higher-dimensional operators. In this
paper we investigate the possible impact of the DUNE neutrino experiment on
constraining the SMEFT. The unprecedented neutrino flux offers an opportunity
to greatly improve the current limits via precision measurements of the trident
production and neutrino scattering off electrons and nuclei in the DUNE near
detector. We quantify the DUNE sensitivity to dimension-6 operators in the
SMEFT Lagrangian, and find that in some cases operators suppressed by an O(30)
TeV scale can be probed. We also compare the DUNE reach to that of future
experiments involving atomic parity violation and polarization asymmetry in
electron scattering, which are sensitive to an overlapping set of SMEFT
parameters.Comment: 23 pages, 4 figures; v2, agrees the version published in JHE
Detrended Fluctuation analysis of Bach's Inventions and Sinfonias pitches
Detrended Fluctuation Analysis (DFA), suitable for the analysis of
nonstationary time series, is used to investigate power law in some of the
Bach's pitches series. Using DFA method, which also is a well-established
method for the detection of long-range correlations, frequency series of Bach's
pitches have been analyzed. In this view we find same Hurts exponents in the
range (0.7-0.8) in his Inventions and sinfonia.Comment: 5 pages, 4 figure
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