Keywords Reaction-diffusion equations, Cauchy problem in R N ,dissipativeness, global attractor
MSC (2000) 35K15, 35K57, 35B40, 35B41TheCauchyproblem forasemilinear second orderparabolic equation The Cauchy problem for a semilinear second order parabolic equationN , is considered within the semigroup approach in locally uniform spacesẆGlobal solvability, dissipativeness and the existence of an attractor are established under the same assumptions as for problems in bounded domains. In particular, the condition sf (s, 0) < 0, |s| > s0 > 0, together with gradient's "subquadratic" growth restriction, are shown to guarantee the existence of an attractor for the above mentioned equation. This result cannot be located in the previous references devoted to reaction-diffusion equations in the whole of R N .