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We have investigated the creation and destruction of asteroid families using a collisional code which follows the evolution of the size distributions of both the main-belt background population and individual families which are produced by collisions within the population. Starting with a small-mass initial belt, the number of families produced by collisional breakup of parent bodies larger than 100...
We model the collisional evolution of Trojan asteroids using a numerical code which combines recent calculations of the intrinsic collision probabilities and impact speeds in the Trojan swarms (Marzariet al.1996) with our current understanding of the outcomes of high-velocity collisions between asteroid-sized bodies. Using plausible collision parameters and energy scaling of impact strength with size,...
The Edgeworth-Kuiper Belt contains a population of objects ~10 3 times that of the main asteroid belt, spread over a volume ~10 3 larger and with relative speeds ~10 times lower. As for the asteroids, the size distribution of Edgeworth-Kuiper Belt objects has been modified by mutual impacts over Solar System history. We have modeled this collisional evolution process using a numerical...
This article is an overview of the Small Bodies Node (SBN) of the Planetary Data System to inform the community about the services and data available. Datasets currently available through SBN are summarized as well as those planned to be ingested in the future. Procedures for accessing data from the SBN (FTP or WWW) and SOARD are described, as are other activities of the SBN.
Two cellular systems have been used to investigate the modulation of tau hyperphosphorylation. In the first system, the effects of the excitatory amino acid glutamate, the microtubule destabilising agent colchicine, and β 25-35 -amyloid peptide on tau phosphorylation were studied in rat cortical neurones in primary culture. Using immunocytochemistry and western blot analysis,...
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