Frank van den Bosch

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A seasonal model, where a growing season is defined as the time between sowing and harvest and alternates with an inter-crop period, was derived to study the effects of the ‘cost of virulence’ and cropping ratio on durability of resistance. We assumed a single strain of virulent pathogen, a single strain of avirulent pathogen and two cultivars (one(More)
We investigate the hypothesis that the cores of elliptical galaxies and bulges are created from the binding energy liberated by the coalescence of supermassive binary black holes during galaxy mergers. Assuming that the central density profiles of galaxies were initially steep power laws, ρ ∼ r, we define the “mass deficit” as the mass in stars that had to(More)
Using data from the 2 degree Field Galaxy Redshift Survey (2dFGRS) we compute the conditional luminosity functions (CLFs) of earlyand late-type galaxies. These functions give the average number of galaxies with luminosities in the range L±dL/2 that reside in a halo of mass M , and are a powerful statistical tool to link the distribution of galaxies to that(More)
This paper explores the effect of discontinuous periodic host absence on the evolution of pathogen transmission rates by using R 0 maximisation techniques. The physiological consequence of an increased transmission rate can be either an increased virulence, i.e. there is a transmission-virulence trade-off or ii) a reduced between season survival, i.e. there(More)
We use non-radiative N-body/SPH simulations of structure formation in a ΛCDM cosmology to compare the angular momentum distributions of dark matter and gas in a large sample of halos. We show that the two components have identical spin parameter distributions and that their angular momentum distributions within individual halos are very similar, all in(More)
Using a statistically representative sample of 911 central galaxies (CENs) from the SDSS DR4 Group Catalogue, we study how the structure (shape and size) of the first rank (by stellar mass) group and cluster members depends on (1) galaxy stellar mass (Mstar), (2) the global environment defined by the dark matter halo mass (Mhalo) of the host group, and (3)(More)
  • John K. Parejko, Tomomi Sunayama, +36 authors Zheng Zheng
  • 2013
We report on the small-scale (0.5 < r < 40 h−1 Mpc) clustering of 78 895 massive (M∗ ∼ 1011.3 M ) galaxies at 0.2 < z < 0.4 from the first two years of data from the Baryon Oscillation Spectroscopic Survey (BOSS), to be released as part of Sloan Digital Sky Survey (SDSS) Data Release 9 (DR9). We describe the sample selection, basic properties of the(More)
We investigate the incidence of major mergers creating Mstar > 10M⊙ galaxies in the dense environments of present-day groups and clusters more massive than Mhalo = 2.5 × 10M⊙. We identify 38 pairs of massive galaxies with mutual tidal interaction signatures selected from > 5000 galaxies with Mstar ≥ 5×10M⊙ that reside in a halo mass-limited sample of 845(More)