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During the past two years, a new solar system exploration roadmap has been developed, supplanting the previous 2003 version. This roadmap identifies a number of high priority technology developments that will be essential to the success of several of the roadmap missions. These technologies include advanced radioisotope power systems (RPS), aerocapture systems and advanced propulsion, numerous technologies...
Since the Viking missions to Mars in the 1970s, accounting for the costs associated with planetary protection implementation has not been done systematically during early project formulation phases, leading to unanticipated costs during subsequent implementation phases of flight projects. In the intervening period, more rigorous planetary protection requirements, resulting from new knowledge about...
This paper makes a methodological contribution to the emerging field of learner corpus analysis [Granger, S., 1998. Learner English on Computer. Longman, London, 1998; Granger, S., 2002. Computer Learner corpora, Second Language Acquisition, and Foreign Language Teaching. John Benjamins, Amsterdam, 2002] and to Second Language Acquisition (SLA) research by suggesting that a corpus of learner and expert...
The effects of PA-I lectin isolated from the human pathogen Pseudomonas aeruginosa upon cellular metabolism in vivo have been studied using the rat gut as a model system. Orally ingested PA-I lectin stimulated metabolic activity and induced polyamine accumulation and growth in the small intestine, caecum and colon. The nature and extent of the changes induced by PA-I lectin were similar to those...
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