English summary: With the naturalismo radical or radical naturalism, this work rehabilitates a very successful variety of Spanish naturalism that has been, for ideological reasons, dismissed from the official canon. On the basis of the novels of Eduardo Lopez Bago (1855-1931) and Alejandro Sawa (1862-1909), the strategies are investigated through which the knowledge of new leading science of medicine was narrativized and instrumentalized for a scientifically...