AIM The objective of this study was the investigation of a possible improvement of tumor resection rate, i.e. R0 vs. R1 resection when intraoperative ultrasound evaluation of tissue margins is used during breast-conserving surgery (BCS). PATIENTS AND METHODS A total of 250 cases were evaluated retrospectively. The impact of ultrasound analysis onto clean margin rates was evaluated. A subgroup...

low- temperature (lt) tolerance is an economic trait in winter wheat that determines the plants’ ability to successfully cope with below freezing temperatures. to identify the genomic regions associated with lt tolerance in hexaploid wheat, an f2:3 population was produced from crossing between winter type and tolerant parent, mirnovoskaja 808 (lt50 = -20oc), and spring type and susceptible pare...

In this paper, we first propose a time-periodic reaction–diffusion epidemic model which incorporates simple demographic structure and the latent period of infectious disease. Then we introduce the basic reproduction number R0 for this model and prove that the sign of R0 − 1 determines the local stability of the disease-free periodic solution. By using the comparison arguments and persistence th...

Clustering of cosmic-ray sources a†ects the Ñux observed beyond the cuto† imposed by the cosmic microwave background and may be important in interpreting the AGASA, FlyÏs Eye, and HiRes data. The standard deviation, p, in the predicted number N of events above 1020 eV is p/N \ 0.9(r0/10 Mpc)0.9, where is the unknown scale length of the correlation function Mpc for Ðeld galaxies, r0 (r0^ 10 km s...

We consider a real Gaussian process X with unknown smoothness r0 ∈ N0 where the mean-square derivative X(r0) is supposed to be Hölder continuous in quadratic mean. First from selected sampled observations, we study reconstruction of X(t), t ∈ [0, 1] with X̃r(t), a piecewise polynomial interpolation of degree r ≥ 1. We show that the mean-square error of the interpolation is a decreasing function ...

Using a multiple stage age of infection model, we derive an expression for the basic reproduction number, R0. We apply this method to find R0 in analogous treatment models. We find, in the model without treatment, R0 depends only on the mean infective period, and not on the infective distribution. In treatment models, R0 depends on the mean infective and mean treatment period, as well as the di...

We study an SAIRS-type epidemic model with vaccination, where the role of asymptomatic and symptomatic infectious individuals is explicitly considered in transmission patterns disease. provide a global stability analysis for model. determine value basic reproduction number R0 prove that disease-free equilibrium globally asymptotically stable if R0<1. If R0>1, disease free unstable unique endemi...

In this article, we introduce an infinite-dimensional deterministic metapopulation SIS model which takes into account the heterogeneity of infections and social network among a large population. We study long-time behavior dynamic. identify basic reproduction number R0 determines whether there exists stable endemic steady state (super-critical case: R0>1) or if only equilibrium is disease-free ...