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This paper presents a new approach, which attempts to provide a basic framework in which security requirements and security assurance can be aligned in a uniform and concise way in a single requirements modelling methodology. This framework aims at providing security requirements modelling method for the system development as well as security assurance… (More)
Chiral crystals of achiral benzils act as efficient chiral initiators of asymmetric autocatalysis to afford highly enantioenriched pyrimidyl alkanols whose absolute configurations depend upon the enantiomorph of the crystal used in conjunction with asymmetric autocatalysis with amplification of enantiomeric excess.
Asymmetric amplification during self-replication is a key feature that is used to explain the origin of homochirality. Asymmetric autocatalysis of pyrimidyl alkanol in the asymmetric addition of diisopropylzinc to pyrimidine-5-carbaldehyde is a unique example of this phenomenon. Crystallization of zinc alkoxides of this 5-pyrimidyl alkanol and… (More)