Signal characteristic

Figure 4.16. Free-surface velocity profiles measured on 1400° C molybdenum. The free-surface velocity profile is characterized by an 0.05 km/s amplitude elastic precursor, a plastic wave front, and a spall signal (characteristic dip) upon unloading. The dashed lines represent the expected free surface velocity based on impedance-match calculation [Duffy and Ahrens, unpublished].

Neote K, DiGregorio D, Mak JY, Horuk R, Schall TJ. Molecular cloning, functional expression, and signaling characteristics of a C-C chemokine receptor. Cell 1993 72 415 125. 

Treatment of the photolysate with methanol gave two diastereomeric methoxysilanes in about 3 1 proportions, consistent with methanol addition being a nonstereospecific process. During extended photolysis (8 hours) to convert all of 25 to 26 it was observed that the concentration of 26 decreased, and a set of signals characteristic of a different silene grew in (no change of relative proportions occurred in the dark). The chemical... 

The 31P NMR spectra of 28-30 showed signals characteristic of their structural features. Dimeric species 28 with l,l,l-tri(diphenylphosphinomethyl)ethane affords two singlets at 23.0 and —28.6 ppm due to the coordinated and nonco-ordinated P donors, respectively. For trimeric species 29, two singlets occur at 24.3 and 14.4 ppm, ascribed to two classes of P donors in bis[2-(diphenylphos-phino)ethyl]phenylphosphine. Because of two types of P donors in tri[2-(diphenylphosphino)ethyl]phosphine, tetrameric species 30 exhibits two singlets at 16.4 and 24.0 ppm. 

Similar isomerization of silicon organophosphorus betaines 20k-m to silylated phosphorus ylides 70 (Scheme 31)84,96 is distinctly detected by 13C, and 31P NMR from the appearance of signals characteristic of... 

Some aryltellurium di- and trichlorides react with AgF to form Ar2TeF2 and ArTeF3, respectively (Ar = p-MeOCgH, p-EtOCgH,) (17). The H-NMR spectra of these compounds show the four-line AA BB signal, characteristic of 1,4-disubstituted benzenes. All the aryltellurium compounds are soluble in DMSO. 

As mentioned above, the Pt(2.25+)4 species (B1 and B2) possesses one unpaired electron of Pt(III) (S = 1/2) and is the only species which exhibits paramagnetism among the four oxidation states. The ESR spectrum of the ce-pyridonate-blue species shown in Fig. 7 exhibits an axial signal characteristic of the platinum-blues (g = —2.4 and g = —2.0) (48, 49, 70, 96). Similar signal patterns are also observed for several other blue compounds (34, 47, 57, 86, 88, 89), and these common features show that the unpaired electron resides on the dz2 orbital located along the Pt chain. The g values observed for the para-... 

Equidistant or clustered signals, characteristic of some anionic, nonionic or cationic surfactants (cf. Fig. 2.5.1(a) and (b). So the presence of non-ionic surfactants of alkylpolyglycolether (alcohol ethoxylate) type (AE) (structural formula C H2 i i-0-(CH2-CH2-0)x-H) could be confirmed in the formulation (Fig. 2.5.1(a)) applying APCI-FIA-MS in positive mode. AE compounds with high probability could also be assumed in the heavily loaded environmental sample because of the patterns of A m/z 44 equally spaced ammonium adduct ions ([M + NH4]+) shown in its FIA-MS spectrum in Fig. 2.5.1(b). 

Instead, an EPR signal characteristic for the binding of CO to Nia-C (Van der Zwaan et al. 1986, 1990) was observed (here called Nia -CO). The results were interpreted as follows. 

By this time it was demonstrated that the [3Fe-4S]W+ form of aconitase is inactive, while the [4Fe-4S]2+ form is active. How is the activity of the enzyme affected by the oxidation state of the [4Fe-4S] cluster Because the active enzyme contains a [4Fe-4S]2+ cluster, either the 3+ or 1+ oxidation states may also be stable. The 3+ state is unstable since oxidation of the [4Fe-4S]2+ resulted in the immediate loss of a ferrous ion and conversion to a [3Fe-4S]i+ cluster (46,47). However, reduction of active aconitase by sodium dithionite or photoreduction in the presence of deazaflavin produced in high yields an EPR signal characteristic for [4Fe-4S]l+ clusters (47). When active enzyme within an anaerobic assay cuvette was photoreduced, the activity of the enzyme dropped to 1/3 of its initial value. Further photoreduction resulted in cluster destruction. Then, if the enzyme is reoxidized with air, the activity returned to its original value. This demonstrated that the redox state of the cluster can modulate the enzyme activity. A scheme summarizing the cluster interconversions and various redox states of the Fe-S cluster of aconitase is shown below. 

The isomeric ratio was determined ( H-NMR) from the intensity ratio of the signals characteristic for each of the structures. 

Also relevant to this matter is the fact that the n.m.r. spectra of the free 2,5-anhydro-aMe/iydo-aldoses in deuterium oxide rarely show106 the low-field signal characteristic of the free aldehyde group. Such a signal is generally visible when the spectrum (in chloroform-d) of compounds that are partially substituted is recorded, but its intensity is often weak. 

As illustrated earlier in the text (Figure 10.5), molecules released from the centrifuge generate an oscillatory Raman signal, characteristic of the coherent rotation with well-defined relative phase relation between the quantum states inside a rotational wave packet. Time-resolved coherent Raman response from a wave packet centered at A = 69 in oxygen is plotted at the bottom of Figure 10.9a. Knowing the wave packet composition from the state-resolved detection discussed above. 

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