Couples properties

The distinctive features of cu-bonded H i- Si - H linkages can be illustrated with reference to the unusual IR vibrational and NMR spin-coupling properties of SiH5, compared with those of the parent SiH4. A characteristic measure of hydride bond coupling is the difference in IR frequency between asymmetric and symmetric stretch frequencies,... 

McDermott et al used rotational resonance, a then newly developed solid-state NMR method, for structural studies of an inhibited complex formed by reaction of D-alanine D-alanine ligase, ATP, and the aminoalkyl dipeptide analogue. The measured NMR coupling properties indicate that the two species are bridged in a P—O—P linkage, with a P—P through-space distance of 2.7 0.2 A. This work unambiguously demonstrated that the inactivation mechanism involves phosphorylation of enzyme-bound inhibitor by ATP to form a phos-phoryl-phosphinate adduct. ... 

Kostenis, E., Zeng, F. Y., and Wess, J. (1998). Functional characterization of a series of mutant G protein aq subunits displaying promiscuous receptor coupling properties./. Biol. Chem. 273, 17886-17892. 

Zani, M-L., Pourcher, T., Leblanc, G. (1993). Mutagenesis of acidic residues in putative membrane-spanning segments of the melibiose permease of Escherichia coli II. Effect on cationic selectivity and coupling properties. J. Biol. Chem. 268,3216-3221. 

Finally, in addition to Sections II (electrical properties), III (magnetic properties), and IV (optical properties), Section V will be devoted to dithiolene complexes exhibiting coexisting or coupled properties (electrical and magnetic, or electrical and optical). 

Some of the compounds discussed in the previous sections were originally synthesized with the aim of obtaining materials with coexisting or coupled properties, such as conductivity and magnetism. 

The vibrational satellite structure, for example of the emission spectrum, is altered due to two different effects. First, because of the red shift of the vibrational modes, as mentioned above, one observes the satelHtes at lower energies relative to the electronic origin. Secondly, the vibronic coupling property of a vibrational mode depends on the specific normal coordinate of that individual mode. Since the coordinates partly change with deuteration, the intensity of the corresponding vibronic satellite maybe modified distinctly. (Compare the Refs. [168, 169,173,175].) This effect is also observed, when the vibronic intensities found for Pt(2-thpy-hg)2 are compared to those of Pt(2-thpy-dg)2, as is shown below in Fig. 25 and in Ref. [23]. 

V. HEAVY ATOM SUBSTITUTION. The series of bromine-substituted 1,2-dioxetanes, shown in Eq. 65, were studied to assess whether such a heavy atom influences the excitation parameters through its spin-orbit coupling property. Qearly, the effect is dramatic on both the total efficiency and the spin-... 

Composite piezoelectric transducers made from poled Pb-Ti-Zr (PZT) ceramics and epoxy polymers form an interesting family of materials which highlight the advantages of composite structures in improving coupled properties in soilds for transduction applications A number of different connection patterns have been fabricated with the piezoelectric ceramic in the form of spheres, fibers, layered, or three-dimensional skeletons Adding a polymer phase lowers the density, the dielectric constant, and the mechanical stiffness of the composite, thereby altering electric field and concentrating mechanical stresses on the piezoelectric ceramic phase. 

Composite materials offer great versatility in coupled-property combinations, that may be exploited in future generations of piezoelectric devices. 

Yan, S. and Bu, Y. (2005) Coupling properties of imidazole dimer radical cation assisted by embedded water molecule toward understanding of interaction character of hydrogen-bonded histidine residue side-chains, J. Chem. Phys. 122, 184324. 

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