Display Structures

The amino acids proline and hydroxyproline exert a stabilizing influence on the triple helix as described in detail in Sect. 4.5. By examining the CB peptides of collagen, a structural stability which is directly proportional to the itnino acid content may thus be found. It has, however, not been possible to synthesize model peptides displaying structural stability comparable to that of the native peptides having corresponding amino acid contents. 

In—Sb heterocycles. In—Sb heterocycles display structural parameters comparable to the Al—Sb and Ga—Sb heterocycles, as shown in Table 12. 

Most tin(II) compounds display structures with a trigonal pyramidal coordination. This is of course to be expected as the tin atom is in the first place electrophilic in order to complete its outer electron configuration (cf. Chapter 5 and 6). To illustrate the resemblance of this geometry between ionic and molecular compounds, the structure of NH4SnF3 (5) 31) is compared with that of the cage compound (Me3CN)3(Me3A10)Sn4 (6) 32). The coordination sphere of the tin atom is the same in 5 and 6 (for the complete structure of 6 see Sect. 6.5) ... 

TOTAL PROTON COUNT FOR THIS STRUCTURE IS (P FOR PROGRAM ESTIMATE) P TOTAL PROTON COUNT BASED UPON NORMAL CONDITIONS IS 8 ARE THERE ANY ABNORMAL VALENCE OR CHARGE CONDITIONS WHICH WOULD AFFECT THIS COUNT (Y/N) N PROTON COUNT FOR NODE 2 (D TO DISPLAY STRUCTURE) ... 

We have been able to identify two types of structural features of platinum surfaces that influence the catalytic surface reactions (a) atomic steps and kinks, i.e., sites of low metal coordination number, and (b) carbonaceous overlayers, ordered or disordered. The surface reaction may be sensitive to both or just one of these structural features or it may be totally insensitive to the surface structure, The dehydrogenation of cyclohexane to cyclohexene appears to be a structure-insensitive reaction. It takes place even on the Pt(l 11) crystal face, which has a very low density of steps, and proceeds even in the presence of a disordered overlayer. The dehydrogenation of cyclohexene to benzene is very structure sensitive. It requires the presence of atomic steps [i.e., does not occur on the Pt(l 11) crystal face] and an ordered overlayer (it is poisoned by disorder). Others have found the dehydrogenation of cyclohexane to benzene to be structure insensitive (42, 43) on dispersed-metal catalysts. On our catalyst, surfaces that contain steps, this is also true, but on the Pt(lll) catalyst surface, benzene formation is much slower. Dispersed particles of any size will always contain many steplike atoms of low coordination, and therefore the reaction will display structure insensitivity. Based on our findings, we may write a mechanism for these reactions by identifying the sequence of reaction steps ... 

System Displays Structures with Salt Attached and Calculated Properties... 

Figure 15.2 shows the arrangement of the atoms in the fully displayed (structural) formulae of these members of this family or homologous series. 

The Tools menu contains commands for manipulating the displayed structures such as Fit, Move, Reflect, Invert, Dock, and Overlay. To dock two interacting structures,... 

Figure 15.7. Mage desktop window. The desktop window of MAGE program consists of three component windows (graphic window, caption window, and text window) as shown for human lysozyme (1 Iza.pdb, 11zb.pdb, and 11zc.pdb). The displayed structural features can be turned on and off via checkboxes. The check marks (

Makowski, L. 1994. Phage display structure, assembly and engineering of filamentous bacteriophage. ( hit. Opin. Struct. Biol. 4, 225—230. 

Planetary nebulae display an amazing variety of structures and sizes, and their incredible beauty makes them my favorite objects in the Galaxy. Some are round some display structures with two lobes some are so strange as to defy description. Many display several shells of gas. 

Many natural products display structural motifs biosynthetically derived from ortho-quinol precursors, and some even feature ortho-quinol moieties in their final structural arrangement [1, 6]. Asatone (7) and related neolignans can be put forward as classic examples of complex natural products derived from cyclodimerization of oxidatively activated simple phenol precursors (Figure 5) biomimetic syntheses of 7 have accordingly been accomplished by anodic oxidation (Section 15.2.1) and by Pelter oxidation (Section 15.2.2) of the naturally occurring phenol 9 [34, 36]. 

Structural colors may be caused by the diffraction or interference of light by tiny, regularly-spaced structures within a substance. Many insects and bird feathers display structural color. Structural defects in a material s crystal lattice can also affect its color. Excess or missing ions act as color centers and may affect the way the substance absorbs light. 

Figure 5.11 displays the analysis of a mixture of peptides from ovalbumin obtained by CE/MS coupled to ESI. The spectrum shown is a mean of the spectra acquired during the elution of the indicated broad peak. It corresponds to a mixture of doubly or triply charged ions of several glycopeptides [27]. The displayed structures were actually deduced from MS/MS fragmentation spectra of these multiply charged ions. 

In the condensed phase, where the lifetimes of the anions are increased and their wavefunctions should be considerably more localized, all the anion states should experience considerable reorganization. In other words, when compared to the condensed phase anions, the high-lying gas phase anions are "non-relaxed" and the low-lying anions essentially "fully relaxed". Clearly, any anion state which lives sufficiently long to display structure due to nuclear motion will be essentially fully relaxed electronically. 

Menu/display hierarchy Display structure Screen formats Screen access security Toolbar options Message bars... 

Armed with this definition of prediction one can now investigate whether the reaction function y can be predicted. The answer is negative. The reaction function y cannot be predicted in general because, as shown in Fig. 1.5, there are always (p intervals in which y displays structure on all scales. In more concrete terms this means that for box C, and no matter how small the error A, there always exist (p intervals of length A(p in which y can attain any value between 0 and 1. This means additionally that the reaction function y is not experimentally resolvable. 

The publication in 1984 of the resolution of the X-ray crystal structure of the reaction center (RC) of the photosynthetic bacterium Rhodopseudomonas viridis [73] inspired many research groups, and thus initiated the design and synthesis of multifarious multicomponent systems expected both to display structural analogy with the RC and to fulfill some of its photochemical and electron transfer functions [74]. 

Although hepatocytes appear to be relatively uniform under the light microscope, they display structural heterogeneity when viewed under an electronic microscope and functional heterogeneity on a metabolic level, (s. p. 24) This heterogeneous zoning provides optimum control and prevents futile cycles. However, the zones have no clear-cut boundaries, and merge freely with each other, (lo, 28, 42-44, 46) (s. tab. 3.2)... 

Fig. 1.3 Illustration of the under-wrapping of protein structure. Dehydron pattern of human ubiq-uitin (ribbon display in Fig. 1.1b). Dehydrons are indicated as green segments joining the a-carbons of the paired units, well-wrapped hydrogen bonds (p> 19) are shown in light gray, and the protein backbone is conventionally shown as blue virtual bonds joining the a-carbons of consecutive amino acid units. The displayed structure has 33 backbone hydrogen bonds, of which 11 are dehydrons. Thus, the extent of under-wrapping for this protein is 33%...

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