introduction: hela cell is a widely studied cell line derived from human cerzix adenocarcinoma. the cells are epithelial - like in morphology and susceptible to polio viruses and adenovirus type 5. hela cells are usually as monolayer for isolation and propagation of some human viruses, as well as for the expression of recombinant proteins, including hepatitis b surface antigen. the aim of this ...

We examine a discrete-time model of plant-herbivore interaction, in which the population plants follows Ricker law and is affected by strong Allee effects. discuss equilibrium points, including their characteristics number. Additionally, we analyze detail local behavior solutions around points. Under certain initial conditions, both populations may go extinct. conduct research demonstrating occ...

In this note, we study sets on the real line which are null with respect to all doubling measures on R, or with respect to all dyadic doubling measures on R. We give some suucient conditions for the former, a test for the latter, and some examples. Our work is motivated by a characterization of dyadic doubling measures by Feeerman, Kenig and Pipher 5], and by a result of Martio 8] on porous set...