In this note we are going to shed new light on some aspects of the theory of the radical axis. For a rather complete account of this theory, see Chapter VIII of [1]. We are going to make use of but the most basic properties of radical axes (the existence of the radical axis and of the radical center), and prove some possibly new facts along with a few known ones. First we introduce several conv...

background: pasteur institute of iran was established in 1919 with the aim to produce vaccines and prevent communicable diseases in iran. over time, their activities extended into areas of research, education and services. naturally, such a vast development begs establishment of a comprehensive management and monitoring system. with this outlook, the present study was carried out with the aim t...