Hypothetical mixing model

To avoid the interference from intramolecular REDOR dephasing, peptides with 15NH, labels could be mixed with peptides with 13COy labels in a 1 1 ratio before fibrillization, where i and j denote the residues with isotopic enhancement at the amide and carbonyl sites, respectively. If an in-register parallel (3-sheet is considered as the hypothetical structure, the most adequate model for the analysis of the 13C 15N REDOR data measured for the case of i = j should be a 15N-13C-15N spin system, where the NCN angle is ca. 127° and the two 15N-13C distances are 5.3 and 5.5 A (Fig. 4a). For the case of i = j + 1, the NCN angle should be 154° and the two 15N-13C distances 4.2 and 5.6 A. Other combinations of i and j for an... 

Figure 1 X-ray and 7-ray fluxes for Model 10H (no mixing). The numbers (with the solid curves) indicate the energy bands in keV the dotted curve is for the 7-ray line at 847 keV and the dashed curve is for the Fe Ka line at 6.4 keV. The 5

Robin and Day presented a particularly helpful molecular orbital description of the hypothetical Cu Y2X2Cu X3 mixed valence system (Figure 3). This model indicates that the difference in energy between the mixed valence transitions 1 and 2 is equal in energy to the lowest energy ligand field transition in Cu. Unlike, the localized square-planar Cu complexes where three transitions occur, four are expected, 1-4, for the mixed valence system. The intensities of these... 

We divide the airshed models discussed here into two basic categories, moving cell models and fixed coordinate models. In the moving cell approach a hypothetical column of air, which may or may not be well mixed vertically, is followed through the airshed as it is advected by the wind. Pollutants are injected into the column at its base, and chemical reactions may take place within the column. In the fixed coordinate approach the airshed is divided into a three-dimensional grid. 

Ringwood (1979) first proposed these models but the concept was more fully developed by Wanke (1981). In Wanke s model, the Earth accretes by heterogeneous accretion with a mixing ratio A B — 85 15. Most of component B would be added after the Earth had reached about two thirds of its present mass. The oxidized volatile-rich component would be equivalent to Cl carbonaceous chondrites. However, the reduced refractory rich component is hypothetical and never has been identified in terms of meteorite components. 

Figure 7 Experimental XRD spectra for odinite and calculated diagrams for hypothetical minerals using the NEWMOD program (Reynolds, 1985) are shown. The berthierine spectrum was simulated using a ferrous-aluminous 7 A clay structure with 3-6 coherent diffracting domain structure. The mixed layer 7 A/smectite mineral berthierine/nontronite was modeled using 60% berthierine layers and 3-6 layer coherent diffracting domains in a disordered (R = 0) structure (after Odin, 1988, p. 162).

Uncertainty/Precision The hypothetical data sets were run with noninforma-tive priors (flat precision of 0.0001). The prior parameter means were set to the simulated means. The two competing models were lit simultaneously in WinBUGS Version 1.4 (17) as a mixture model with a mixing population parameter (mix— in the following notation mix is used in accordance with its use in the WinBUGS code shown in Figure 5.2) drawn from a uniform (0,1) distribution. 

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