Large, domains

MODELS REPRESENTING SELECTED SEGMENTS OF A LARGE DOMAIN... 

Electrochemistry plays an important role in the large domain of. sensors, especially for gas analysis, that turn the chemical concentration of a gas component into an electrical signal. The longest-established sensors of this kind depend on superionic conductors, notably stabilised zirconia. The most important is probably the oxygen sensor used for analysing automobile exhaust gases (Figure 11.10). The space on one side of a solid-oxide electrolyte is filled with the gas to be analysed, the other side... 

The structure of the UQ-cyt c reductase, also known as the cytochrome bc complex, has been determined by Johann Deisenhofer and his colleagues. (Deisenhofer was a co-recipient of the Nobel Prize in Chemistry for his work on the structure of a photosynthetic reaction center [see Chapter 22]). The complex is a dimer, with each monomer consisting of 11 protein subunits and 2165 amino acid residues (monomer mass, 248 kD). The dimeric structure is pear-shaped and consists of a large domain that extends 75 A into the mito-... 

The energy threshold appears to be dependent on the excitation spot size at constant pump intensity, which indicates that amplification occurs over the whole illuminated area. It should be stated that, despite the large domains, the optical quality within the domains is lower than that of the annealed films. This gives rise to additional scattering losses which decrease the magnitude of the amplification. 

A further confirmation that mirrorlcss lasing is restricted to single domains comes from an experiment in which an Oocl-OPV5 film has been crystallized from the isotropic melt phase (above 204 "C). Melt crystallization resulted in the formation of large domains with dimensions up to several millimeters (see Fig. 16-29 C). Tlie normalized emission spectra for different excitation energies are shown in Figure 16-47. The excitation spot diameter was 1 mm in these ex-... 

In ferromagnetic materials, large domains of electrons have the same magnetic... 

Figure 5-6. Examples of tertiary structure of proteins. Top The enzyme triose phosphate isomerase. Note the elegant and symmetrical arrangement of alternating p sheets and a helices. (Courtesy of J Richardson.) Bottom Two-domain structure of the subunit of a homodimeric enzyme, a bacterial class II HMG-CoA reductase. As indicated by the numbered residues, the single polypeptide begins in the large domain, enters the small domain, and ends in the large domain. (Courtesy ofC Lawrence, V Rod well, and C Stauffacher, Purdue University.)...

To better understand the differences in their catalytic behavior, the catalysts were characterized by XRD and UV-vis DRS. Unfortunately, except for the peak at 77.6° 26 (311 diffraction), the other Au diffraction peaks overlapped with those of y-Al203. The size of the coherent domains of Au, listed in Table I, were estimated using the width of this diffraction peak and the Debye-Sherrer equation. They showed that catalysts of both groups A and C had small coherent domains, whereas those of group B had large domains. 

Large domains of oriented single crystals of poly(TCDU) and poly(DMDA) were produced on the alkali halide surface. Figures 1 and 2 show the typical elongated platelet morphology. Selected... 

This review will discuss two types of patterning approaches that can be employed with patternable block copolymers. Due to the fact that most practical applications require block copolymer thin films with large-domain ordered patterns, particular attention is paid to the optimization of bottom-... 

An example of the use of this method with the constant capacitance model on the data for TiC>2 in 0.1 M KNO is illustrated in Figure 6. It appears from the figure that the problem is perfectly well determined, and that unique values of Ka and Ka2 can be determined. However, as is shown below, the values of Ka and Ka2 determined by this method are biased to fulfill the approximations made in processing the data (i) on the acidic branch, nx+, nx nx-, which yields a small value for Ka2, and (ii) on the basic branch, nx-, nx nx+, which yields a large value of Ka. Thus the approximation used to find values for Qa and Qa2 leads to values of Ka and Ka2 consistent with the approximation of a large domain of predominance of the XOH group. This constraint arose out of the need for mathematical simplicity, not out of any physical considerations. 

Fig. 7.3. Conformational changes and E2-binding specificity of the HECTdomain. (A) Schematic diagram of the structures of E6AP and WWPl HECT domains with their N-lobes superimposed indicating the potential large domain movement of the HECT E3. (B)...

Two [Fe] hydrogenase structures have so far been determined from C. pasteurianum (Cp) (Peters et al. 1998) and D. desulfuricans (Dd) (Nicolet et al. 1999). They have in common a large domain, which contains the catalytic site and three [4Fe-4S] iron sulfur clusters. The catalytic site and the closest (proximal) cluster are deeply buried inside the protein between two domains (or lobes), with access to a third, ferredoxin-like, domain that contains the two remaining (medial and distal) clusters. By contrast with [NiFe] hydrogenases the proximal [4Fe-4S] cluster is directly bridged to the bin-uclear active site by a cysteic thiolate (Fig. 6.12). 

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