This paper presents lessons learned during the development of NASA's Systems Test and Operations Language (STOL) Intelligent Tutoring System (ITS), being developed at NASA Goddard Space Flight Center with support by Carlow Associates Incorporated and Computer Sciences Corporation. The purpose of the intelligent tutor is to train STOL users by adapting tutoring based on inferred student strength...

BACKGROUND The potential biofuel plant Jatropha curcas L. is affected by larvae of Archips micaceanus (Walker), a moth of the family Tortricidae. The hybrid Bacillus thuringiensis (Bt) δ-endotoxin protein Cry1Ab/1Ac confers resistance to lepidopteran insects in transgenic rice. RESULTS Here, we report the production of a marker-free transgenic line of J. curcas (L10) expressing Cry1Ab/1Ac usi...

Tryptophan has been widely used as a probe of protein environment and dynamics. Proper interpretation of the experimental results requires a detailed understanding of tryptophyl photoprocesses, so much effort has been made to understand the fluorescence decay of zwitterionic tryptophan. For a review of these efforts, see ref. [l] . It is now well established that the fluorescence decay of trypt...