Sentence examples for for additional rigidity from inspiring English sources
It differs in that the original block ended just below the crank centerline, while the crankcase of recent small blocks extends well below the centerline to allow for additional rigidity.
An intrinsic preference for this conformation is also exhibited by positively charged chiral PNA dimers carrying 3-amino-D-alanine or 4-aza-D-leucine residue units that provide for additional rigidity by side-chain hydrogen bonding to the backbone carbonyl oxygen.
Hence the major isomer in the cyclization of both 35 and 36 results from group transfer syn to the hydrogen atoms at the β-lactam ring junction (as it does in the cyclization of 1, 13, 33, 34, and 37), although the diastereoselectivity is higher for 36, presumably due to the additional rigidity in the tricyclic ring system rendering the face syn to the one-carbon bridge less accessible.
In crustaceans, additional rigidity is achieved by having the exoskeleton impregnated with varying amounts of calcium carbonate.
There are two additional rigidity values that need to be specified in the ATENA 3D input.
In the DPAT series, however, Sahlholm et al. suggested that the rigidity of the ring system results in a tight interaction of the aromatic ring without the need for additional hydrogen bonding interactions.
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