Trajectory structures and transport.
The special problem of transport in two-dimensional divergence-free stochastic velocity fields is studied by developing a statistical approach, the nested subensemble method. The nonlinear process of trapping determined by such fields generates trajectory structures whose statistical characteristics are determined. These structures strongly influence the transport.
The search for determinants responsible for changes in CD4 cells count can help to optimize the efficiency of the nevirapine-based antiretroviral therapy in Cote d'Ivoire. Our study on the response to this treatment was carried out through taxonomy of CD4 cells count trajectories using non-hierarchical-descendant model. One hundred and sixty four patients were grouped according to their baseline CD4 count in three strata (<100/mm