241 research outputs found
Evaluation of the Swedish breeding program for cavalier King Charles spaniels
A breeding program with the aim of reducing the prevalence of mitral regurgitation (MR) caused by myxomatous mitral valve disease (MMVD) in Cavalier King Charles Spaniels (CKCS) is currently ongoing in Sweden. In this investigation 353 CKCS were selected as a sample of the population and 150 were examined by auscultation for heart murmurs when they reached the age of six years in 2007 and 2009. The aim with this investigation was to study the prevalence of heart murmurs in six-year-old CKCS and to estimate if prevalence has decreased since the breeding program was introduced 2001. The effect of the breeding program was evaluated by comparing the prevalence of heart murmurs in the two groups. In 2007, the prevalence of heart murmurs was 52% (50% for females and 54% for males) and in 2009, the prevalence was 55% (44% for females and 67% for males). No significant difference was found in the prevalence of heart murmurs between 2007 and 2009 (P = 0.8). For all six-year-old CKCS, the prevalence of heart murmur was 53% (females 46% and males 61%), which is higher than previous Swedish investigations
Percolation in invariant Poisson graphs with i.i.d. degrees
Let each point of a homogeneous Poisson process in R^d independently be
equipped with a random number of stubs (half-edges) according to a given
probability distribution mu on the positive integers. We consider
translation-invariant schemes for perfectly matching the stubs to obtain a
simple graph with degree distribution mu. Leaving aside degenerate cases, we
prove that for any mu there exist schemes that give only finite components as
well as schemes that give infinite components. For a particular matching scheme
that is a natural extension of Gale-Shapley stable marriage, we give sufficient
conditions on mu for the absence and presence of infinite components
Critical phenomena in exponential random graphs
The exponential family of random graphs is one of the most promising class of
network models. Dependence between the random edges is defined through certain
finite subgraphs, analogous to the use of potential energy to provide
dependence between particle states in a grand canonical ensemble of statistical
physics. By adjusting the specific values of these subgraph densities, one can
analyze the influence of various local features on the global structure of the
network. Loosely put, a phase transition occurs when a singularity arises in
the limiting free energy density, as it is the generating function for the
limiting expectations of all thermodynamic observables. We derive the full
phase diagram for a large family of 3-parameter exponential random graph models
with attraction and show that they all consist of a first order surface phase
transition bordered by a second order critical curve.Comment: 14 pages, 8 figure
Temperature and pressure evolution of the crystal structure of Ax(Fe1-ySe)2 (A = Cs, Rb, K) studied by synchrotron powder diffraction
Temperature-dependent synchrotron powder diffraction on Cs0.83(Fe0.86Se)2
revealed first order I4/m to I4/mmm structural transformation around 216{\deg}C
associated with the disorder of the Fe vacancies. Irreversibility observed
during the transition is likely associated with a mobility of intercalated
Alkali atoms. Pressure-dependent synchrotron powder diffraction on
Cs0.83(Fe1-ySe)2, Rb0.85(Fe1-ySe)2 and K0.8(Fe1-ySe)2 (y ~ 0.14) indicated that
the I4/m superstructure reflections are present up to pressures of 120 kbar.
This may indicate that the ordering of the Fe vacancies is present in both
superconducting and non-superconductive states.Comment: 11 pages, 5 figures, 1 tabl
CLTs and asymptotic variance of time-sampled Markov chains
For a Markov transition kernel P and a probability distribution
Ό on nonnegative integers, a time-sampled Markov chain evolves according
to the transition kernel PÎŒ = ÎŁkÎŒ(k)Pk. In this note we obtain CLT
conditions for time-sampled Markov chains and derive a spectral formula
for the asymptotic variance. Using these results we compare efficiency of
Barker's and Metropolis algorithms in terms of asymptotic variance
ACVIM consensus guidelines for the diagnosis and treatment of myxomatous mitral valve disease in dogs
This report, issued by the ACVIM Specialty of Cardiology consensus panel, revises guidelines for the diagnosis and treatment of myxomatous mitral valve disease (MMVD, also known as endocardiosis and degenerative or chronic valvular heart disease) in dogs, originally published in 2009. Updates were made to diagnostic, as well as medical, surgical, and dietary treatment recommendations. The strength of these recommendations was based on both the quantity and quality of available evidence supporting diagnostic and therapeutic decisions. Management of MMVD before the onset of clinical signs of heart failure has changed substantially compared with the 2009 guidelines, and new strategies to diagnose and treat advanced heart failure and pulmonary hypertension are reviewed
ACVIM consensus statement guidelines for the classification, diagnosis, and management of cardiomyopathies in cats
Cardiomyopathies are a heterogeneous group of myocardial disorders of mostly unknown etiology, and they occur commonly in cats. In some cats, they are well tolerated and are associated with normal life expectancy, but in other cats they can result in congestive heart failure, arterial thromboembolism or sudden death.
Cardiomyopathy classification in cats can be challenging, and in this consensus statement we outline a classification system based on cardiac structure and function (phenotype). We also introduce a staging system for cardiomyopathy that includes subdivision of cats with subclinical cardiomyopathy into those at low risk
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