Our work determines the qualitative and quantitative conditions by which dispersal and network structure control the persistence of a set of age-structured patch populations. Mathematical modelling combined with a graph theoretic analysis demonstrates that persistence depends crucially on the topology of cycles in the dispersal network which tend to enhance the effect of larvae “”returning home.”" Our method clarifies the impact directly due to network structure, but this almost by definition can only be achieved by examining

Barasertib molecular weight the simplified case in which patches are identical; an assumption that we later relax. The methodology identifies critical migration routes, whose presence are vital to overall stability, and therefore should have high conservation priority. In contrast, “”lonely links,”" or links in the network that do not participate in a cyclical component, have no impact on persistence and thus have low conservation priority. A number of other intriguing criteria for persistence are derived. Our modelling framework reveals new insights

regarding the determinants of persistence, stability, Selleck 3 Methyladenine and thresholds in complex metapopulations. In particular, while theoretical arguments have, in the past, suggested that increasing connectivity is a destabilizing feature in complex systems, this is not evident in metapopulation networks where connectivity, cycles, coherency, and heterogeneity all tend to enhance persistence. The results should be of interest for many other scientific contexts that make use of network theory.”
“The time-resolved magnetization dynamics of epitaxial Fe3O4 thin films grown on GaN(100) was studied using a field pumped time-resolved magneto-optical Kerr (TRMOKE) setup. The dynamic responses of the Napabucasin mw magnetization in the 3 and 6 nm Fe3O4/GaN films under a 1 kOe magnetic field pulse

were measured and compared to a macrospin Landau-Lifshitz-Gilbert (LLG) simulation. The anisotropy constants of the two systems have been estimated and the damping constant has been extracted by applying different bias field along two orthogonal directions. This work provides a first TRMOKE study of thickness and frequency dependence of damping in single crystal Fe3O4/GaN systems. (C) 2011 American Institute of Physics. [doi:10.1063/1.3563058]“
“Interleukin-17 (IL-17) plays an important role in the regulation of cellular and humoral immune responses. Recent studies suggest a role for IL-17 in transplantation. Our study investigated whether quantifying IL-17(+) cells in renal transplant biopsies during acute rejection could have additional prognostic value for better stratifying patients at risk for nonresponsiveness to anti-rejection therapy and future graft dysfunction.