Topographical representation

Figure 6.3 Potential energy surface for colinear reaction AB + C —> A + BC (a) 2-D topographical representation (b) 3-D representation (c) potential energy along reaction coordinate (d) atomic configurations along reaction coordinate...

One of the most common and useful of these is the COSY (correlated ectroscopy) spectrum (Fig. 16). In this spectrum two ordinary onedimensional spectra are correlated with each other through spin-spin coupling. The 2D spectrum is a topographic representation, where spots represent peaks. The ID spectra at the top and side are projections of these peaks. Along the diagonal of the 2D spectrum is a spot for each group of peaks in the molecule. 

Yamamoto M (1979) Topographical representation in rabbit cerebellar flocculus for various afferent inputs from the brain stem investigated by means of retrograde transport of horseradish peroxidase. Neuroscl Lett., 12, 29-34. 

Wilson CJ, Phelan KD (1982) Dual topographic representation of neostriatum in the globus pallidus of rats. Brain Res., 243, 354-359. 

The successive spectra of the compounds eluted with the mobile phase are recorded continuously and stored in the memory of the instrument, to be treated later using appropriate software. Often spectacular chromatograms can be obtained (Figure 3.20). The ability to record thousands of spectra during a single analysis increases the potential of these detectors systems. A topographic representation of the separation can be conducted, A = f(Xt) (iso-absorption diagrams). 

Figure 11.10 Fluorescence spectra. Above, emission-excitation matrix as a topographic representation in pseudo-3D of a mixture of two salts of uranium and terbium by varying the wavelength of excitation. This type of recording leads to the optimum conditions of measurement for such a mixture. Below, emission-excitation spectra. (A) Emission spectrum of fluorescence obtained by maintaining the wavelength of excitation at 285 nm. (B) Excitation spectrum obtained by maintaining the emission monochromator at 347 nm during the recording.

H3 (and its isotopomers) and the alkali metal triiners (denoted generally for the homonuclears by X3, where X is an atom) are typical Jahn-Teller systems where the two lowest adiabatic potential energy surfaces conically intersect. Since such manifolds of electronic states have recently been discussed [60] in some detail, we review in this section only the diabatic representation of such surfaces and their major topographical details. The relevant 2x2 diabatic potential matrix W assumes the fomi... 

Alex Rosenberg And yet photocopying is a causal process in which there is a sequence of material compositional changes across district existences with what, may be representational but certainly at least, topographic homologies. 

Fig. 6 AFM topographic images (a-d, i, j) and cross sections (e, f, k, I) of a miktoarm PS-P2VP star copolymer adsorbed on mica from chloroform (a-c, e), from THF (d, f) and from acidic water (HC1, pH = 2) in salt free (i, k) and in the presence of 1 mM Na3P04 (j, I). Schematic representation of the solution conformations and conformations in adsorbed state of the PS-P2VP in chloroform (g), THF (h), in water at pH = 2 before (n) and after adsorption (m) respectively (PS arms in red, P2VP ones in blue). Reprinted with permission from [116]. Copyright (2003) American Chemical Society...

To rationalize the stereospecificity of PLE toward a large variety of monocarboxylic and dicarboxylic esters, Tamm and co-workers have proposed the general formula displayed in Fig. 7.5 [5 5] [67]. Here, no representation of the active site is implied, but the model does rationalize numerous data and allows some qualitative predictions. A qualitative topographical model of the active site of PLE has been proposed by Jones and co-workers [68] [69], As shown in Fig. 7.6, substrate binding is defined by a carboxylate group that interacts with the catalytic serine residue, and by one or two hydrophobic groups that bind to sites 1 and/or 2. 

Fig. 7 Topographic images, SFM scan lines, and schematic cross-sectional representation of glass slides with chromium patterns and the formation of the polymer and copolymer layer A cleaned sample, B sample modified with SBDC, C after photopolymerization of styrene for 5h, D after photopolymerization of styrene for 15 h, and E after photopolymerization of styrene for 15 h and subsequently methyl methacrylate for 10 h. (Reproduced with permission from [45] American Chemical Society)...

The surface micro topographs of the three major faces of natural pyrite crystals have the following characteristics (see Fig. 11.2 for a schematic representation). 

The fractionation patterns exhibited % successive members of a progression of polyads (along 02, CC stretch, or along v4, trans-bend) provide a surveyor s map of IVR. One can look at the 1VR trends and see whether the multiresonance model expressed in the H nres (1 polyads provides a qualitative or quantitative representation of the fractionation patterns. The dynamics of even a four-atom molecule is so complicated that, unless one knows what to look for, one can neither identify nor explain trends in the dynamics versus V2 or u4 or Evib- Moreover, by defining the pattern of the IVR and how this pattern should scale with V2, v4, or EVib, the H res / polyad model may make it possible to detect a disruption of the pattern. Such disruptions could be due to a change in the resonance structure of the exact H near some chemically interesting topographic feature of the V(Q), such as an isomerization saddle point. 

C. Schematic representation of microspectrofluorometer with topographic option for studies in single living cells. 

Topographical Aspects, Calculation, and Functional Representation via a Double Many-Body Expansion Method... 

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