Packaging contour

Many graphics packages allow for contour diagrams and surface plots. These are given above for the square of the LCAO plus combination, for any plane containing the intemuclear axis. 

Contour packaging is also called skin packaging. It is package in which thin plastic film or sheet is formed over a product and usually simultaneously sealed to a paperboard or plastic backing. The product serves as a mold. 

From the physics point of view, the system that we deal with here—a semiflexible polyelectrolyte that is packaged by protein complexes regularly spaced along its contour—is of a complexity that still allows the application of analytical and numerical models. For quantitative prediction of chromatin properties from such models, certain physical parameters must be known such as the dimensions of the nucleosomes and DNA, their surface charge, interactions, and mechanical flexibility. Current structural research on chromatin, oligonucleosomes, and DNA has brought us into a position where many such elementary physical parameters are known. Thus, our understanding of the components of the chromatin fiber is now at a level where predictions of physical properties of the fiber are possible and can be experimentally tested. 

Both mechanical and thermal durability requirements favor a circular contour for the filter, since it lends itself to robust packaging and at the same time experiences less severe temperature gradients during regeneration. Furthermore, circular filters are easier to manufacture and control tolerances, making them more cost effective than noncircular contours. Indeed, the latter have also been manufactured for special applications where space constraint is the dominating factor. 

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