Lateral packing

As an example of the third case, we may have conformationally ordered chains, parallel among themselves, with short-range order in the lateral packing. Fiber spectrum features are well-defined layer lines, with diffuse reflections only. 

By and NMR, the occurrence of conformational changes of the AOT molecules with R has been emphasized [13]. An increase of the lateral packing order of the surfactant alkyl chains located in the micellar palisade layer due to water addition has also been pointed out by FT-IR [58,92]. 

Senti and Witnauer206 have reported studies on the fiber diagrams from various alkali-amyloses. Specimens were obtained by deacetylating clamped specimens of amylose acetate with the appropriate alkali. The positions of the alkali ions and the lateral packing of the amylose chains were determined with the aid of Patterson projections. In the A - and B -modifica-tions, the fiber period was 22.6 A. (extension of 6 D-glucose units), whilst in the V -modification it was 8.0 A. These authors have also studied in detail the addition compounds of amylose and inorganic salts with special reference to the structure of the potassium bromide-amylose compound.206 Oriented alkali fibers were treated with the appropriate salt solution. Stoichiometric compounds were formed. The x-ray patterns from these showed that the addition compounds with potassium salts crystallized in... 

Nonapplicable for hcc packing is a requirement for lateral packings, which by Ref. [136] can be formulated as if one allocates a straight line and the distance between two neighboring spheres on this line is a, then the distance between other neighboring spheres on this line is also a. 

First we discuss and construct monodisperse two-dimensional arrangements of impenetrable cylinders in terms of radial distance correlation functions, the lateral packing fraction and number density. In the second step, these hard cylinders are covered by the mean electronic density functions of the RISA chain segment ensemble. Last of all, the Fourier transformation and final averaging is... 

From the earlier work described here, it is clear that the collagen fibril is a complex structure. Many molecular species interplay to produce a fibril whose overall structure plays a specific role in the architecture of the tissue. In spite of such molecular heterogeneity, there are some central structural features of collagen packing that pertain more or less to all fibrillar structures. The purpose of this section is to discuss the generic and specific modulation in axial and lateral packing, and show how these lead to... 

Wess, T. J., Purslow, P. P., and Kielty, C. M. (1998b). X-ray diffraction studies of fibrillin-rich microfibrils Effects of tissue extension on axial and lateral packing. J. Struct. Biol. 122, 123-127. 

The lipid organization in equimolar mixtures of cholesterol, synthetic CER, and free fatty acids closely resembles that in stratum corneum, as both LPP (12.2 nm) and SPP (5.4 nm) are present, the lateral packing of the lipids is orthorhombic, a minor fraction of cholesterol phase separates into crystalline domains, and no additional phases can be detected. Interestingly, free fatty acids are required for proper lipid organization, as only in their presence a dominant formation of the LPP could be detected. This might be related to the limited acyl chain length distribution present in these CER mixtures. 

Abrahamsson, S., et al. 1978. Lateral packing of hydrocarbon chains. Prog Chem Fats Other Lipids 16 125. 

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