Engineering of new

Molecular Engineering of New and Modified Enzymes Site-Directed Mutagenesis Hybrid Enzymes (Figure 11.28)... 

In summary, we have shown that novel anionic host lattices can be constructed from urea, thiourea, or selenourea molecules and various anions as building blocks, which readily adopt different topologies for the accommodation of tetraalkylam-monium ions of various sizes. By employing organic cations as templates and suitable counter anions as an ancillary host material, with or without neutral molecules such as H2O as a third component, the lattice engineering of new urea, thiourea, and selenourea inclusion compounds by self-assembly may be further explored. 

The crystal structures of six 3,6-diaryl-l,2,4,5-tetrazines have been determined and their molecular packing has been compared to the supramolecular architecture observed in related carboxylic acid dimers. In the tetrazines, covalent N-N bonds are considered to replace the intermolecular O-H- - -O hydrogen bonds of the carboxylic acids. In the system investigated, the covalent six-membered ring of the tetrazine was an appropriate replacement for the carboxylic acid synthon. This apparent interplay between molecular and supramolecular units may have applications in the crystal engineering of new materials (Figure 1) <2003HCA1205>. 

Figure 15 shows a comparison of various destructive detachable joining technologies. The progress in plastics engineering has had positive effects on the engineering of new adhesives. Sticking is often... 

Design innovation Enable reverse engineering, then engineering of new S RM... 

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