Particle and Antiparticle sectors in DSR1 and kappa-Minkowski space-time

In this paper we explore the problem of antiparticles in DSR1 and $\kappa$-Minkowski space-time following three different approaches inspired by the Lorentz invariant case: a) the dispersion relation, b) the Dirac equation in space-time and c) the Dirac equation in momentum space. We find that it is possible to define a map $S_{dsr}$ which gives the antiparticle sector from the negative frequency solutions of the wave equation. In $\kappa$-Poincar\'e, the corresponding map $S_{kp}$ is the antipodal mapping, which is different from $S_{dsr}$. The difference is related to the composition law, which is crucial to define the multiparticle sector of the theory. This discussion permits to show that the energy of the antiparticle in DSR is the positive root of the dispersion relation, which is consistent with phenomenological approaches.Comment: 15 pages, no figures, some references added, typos correcte

Features of the Immune Status Against Measles in the Group of Medical Workers and Students of Medical Colleges

The status of community immunity against measles was evaluated in 480 health professionals (HPs) and 619 students of medical colleges in the Republic of Tatarstan. HPs and students were selected at random taking the vaccination status and age into account. The immunity level was assessed by blood serum (plasma) protective antibody (IgG) titers with an enzyme-linked immunosorbent assay. Three hundred sixty-three (75.63 ± 2.253%) health professionals examined were seropositive to measles virus, and 117 (24.38 ± 3.969%) ones being seronegative. A proportion of medical college students susceptible to measles were 45.07 ± 2.979%. The results obtained suggest that the assessment of community immunity against measles in health professionals and students of medical schools and colleges should be continued and susceptible individuals be vaccinated without age limits