Tight loops

In an attempt to design the p-turn-peptide-mimics, aspartic acid (an amino acid also known as aspartate) and lysine (an amino acid especially found in gelatin and casein) were attached to each amine group of 1,3-diaminoada-mantane in the form of amide bonds. The term p-turn refers to a peptide chain that forms a tight loop such that the carbonyl oxygen of one residue is hydrogen... 

III has been cut off and stem II has been closed by a tight loop to form a compact catalytic RNA that will cut a substrate having a suitable nucleotide sequence for binding to the ribozyme. Only 12 bases in this ribozyme are highly conserved. By varying the sequences in the ribozyme half of stems I and III, catalysts that cleave after any sequence GUX, where X=A, C, or V, can be designed. Such catalysts are useful in the laboratory and potentially also in medicine. 

Proline. Residues 42 and 117 rings clearly defined, both in trans conformation. Residues 93 and 114 rings clear, both shown in cis conformation reorganization of the tight loop does permit a fit with 114 trans, but the fit is not quite as good as in the cis conformation and 113 would be in radically different position alternate fit for 93 also possible but not as satisfactory. 

Photo-initiator formation at points of PPH cold deformation during fabrication and use will enhance the photosensitivity of these points and contribute to premature weathering failure of PPH knots, tight loops, hinges, and impact zones. 

The next type of motion in the above theory corresponds to the overall reptational (sliding) motion of the polymer chain within its tube-like constraint. This motion affects the orientation of bonds, not only because the constraining tube is itself curved, but also because in places it may be sufficiently large to accommodate tight loops of chain. As a particular bond is pulled past the extremity of a loop, it may reverse its direction completely. The loss of angular correlation B t) which results is not exponential, and is therefore not strictly describable by a correlation time. Instead,... 

Tight Loops and Effective Fold Surface Tension... 

The 68020 contains an internal 256 byte cache memory. This is an instruction cache, holding up to 64 instructions of the long-word type. Direct access to this cache is not allowed. It serves only as an advance prefetch queue to enable the 68020 to execute tight loops of instructions with any further instruction fetches. Since an instruction fetch takes time to process, the presence of the 256-byte instruction cache in the 68020 is a significant speed enhancement. 

The change in the direction of the chain to produce an antiparallel conformation is commonly achieved by the formation of a tight loop called a... 

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