Open-face sandwich

Fig. 102. Glyceraldehyde-phosphate dehydrogenase domain 2 as an example of an open-face sandwich antiparallel /3 sheet, (a) a-Carbon stereo, viewed from the buried side of the sheet (b) backbone schematic, viewed as in a.

Fig. 105. Examples of small disulfide-rich or metal-rich proteins (shown on the right side) compared with their more regular counterparts in other structural categories (shown at the left), (a) Tobacco mosaic virus protein, an up-and-down helix bundle (b) cytochrome bs, a distorted up-and-down helix bundle (c) trypsin domain 1, a Greek key antiparallel /3 barrel (d) high-potential iron protein, a distorted Greek key /3 barrel (e) glutathione reductase domain 3, an open-face sandwich fi sheet (f) ferredoxin, a distorted open-face sandwich f) sheet.

The system considered above has been extended to a multilayered metal/expl open-faced sandwich (Ref 21). Here the effects of rarefactions at the metal/air boundary have to be considered since they lead to separation of the metal layers. According to Jones (Ref 21) the velocity of the innermost layer of the open-faced sandwich configuration of N layers is given by ... 

As interesting as the Rossi-Ho-Silverman argument is, the PMDA/Cr open-faced sandwich should perhaps be viewed as a putative model for low coverage PMDA-ODA. Were open-faced it-complexes to form they would most likely do so at the lowest Cr coverages, provided (i) there were little or no competition with the ODA portion to form bis(ODA)Cr compounds (ii) significant metal... 

And the very common case (Figure 27.6), where N = 0, which is also called the open-face sandwich. ... 

Solution MIC is still 2.555, and in this open-face-sandwich configuration... 

Figure 27.6. Unsymmetrical sandwich configuration where N 0, also called open-face-sandwich configuration.

The open-face-sandwich configuration will have considerable side losses when finite dimensions are imposed on its area and it no longer is an infinite plane. This is because there is no confinement to gas expansion in the direction parallel to the plate. Let us look at the example of a cylinder of explosive driving a plate off its end, Figure 27.8. 

The flyer velocity can now be found from the open-face-sandwich configuration equation and... 

Another major class of proteins, the a has approximately equal amounts of a-helical and 0 sheet structure. Often there is a cluster of helices at one or both ends of a single 0 sheet. 0 structure is generalh found as antiparallel strands. One particular type oi a - - 0 structure is termed the open-face sandwich 0 structure. The subtilisin inhibitor has a five-stranded 0 structure with two a helices protecting its open face. 

Open-face sandwich In protein structures this term describes a single antiparallel l3 sheet that has a layer of a helices and loops on one side only. 

A microelectrochemical diode with an open-face sandwich arrangement of two closely spaced microelectrodes using dissimilar redox polymers has been described... 

A Boston court, when confronted with the question in a case regarding a zoning law for sandwich shops, ruled that it is commonly understood that a sandwich includes at least two slices of bread. As a fan of the open-faced sandwich, featuring items stacked atop a single slice, 1 beg to differ. But the ruling did get to the heart of the matter— a sandwich must involve bread, which serves as an edible container for fillings (meat, vegetables, cheeses—the possibilities are endless) and spreads (mayo, mustard, jellies, hot sauce, and so on), which add flavor and moisten the bread to prevent dryness. 

U. urease are dissolved in 0.56 ml phosphate buffer (pH 6.8), 0.4 ml of a 1.5% bovine albumin solution and 0.04 ml of a 25% glutaraldehyde solution are added, and the resulting mixture is poured onto a glass plate. The cross-linking is carried to completion at 4°C. The membrane thus produced is washed with water and removed from the glass plate. A disk is cut out with a cork borer and covered in open-faced sandwich fashion with a gas-permeable membrane of a CO2 sensor [182]. 

Reaction of iron atoms with cycloheptatriene to form [Fe( r) -C7H7)-(t7 -C7H9)] was confirmed by another group 15) these workers determined the crystal structure of the species, demonstrating a sandwich structure with the open faces of the two 7j -systems skewed to each other. The temperature-dependent NMR spectrum of this species (16) indicated two types of fiuxional behavior in solution. Evidence for a 1,-2-shift mechanism of the l-5-i7-cycloheptatrienyl moiety in the structure shown. 

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