Mode shift

Another study of a synthetic siderophore analog of mixed cathechol and hydroxamate donor groups exhibited similar spectral shifts with pH as observed for tris-catecholate side-rophores, consistent with a salicylate-binding mode shift (102). While this synthetic siderophore mimic supports the growth of many species of bacteria, it also exhibits a low iron-binding affinity relative to other hexadentate siderophores, with a pFe value of 18.3 (see L(cat2hydroxamate) Table HE). 

Fig. 11. Catecholate-to-salicylate-binding mode shift in catechola-mide donor group siderophores, such as enterobactin (1) and enter-obactin analogs.

The biomolecule sensitivity is defined as the magnitude of the resonant mode shift for a given biomolecule surface density, i.e. fi/L/ap. Upon determining the biomolecule sensitivity, the detection limit (DL) can be calculated. The DL is the minimum surface density of biomolecules that can possibly be measured by the sensing device ... 

Preliminary results of DNA sequence detection using the OFRR are thoroughly described by Suter, et al.32 The experimental setup described above for tracking the resonant mode shift is used. An OFRR with RI sensitivity of about 7 nm/RIU was produced and used for these experiments. The OFRR surface was functionalized with 3APS and then DMA was used as an amine-amine crosslinker. The single-stranded oligonucleotide capture probe was synthesized with an amine functional group connected to the 5 end by a 6-carbon linker, and has a 25 base-pair sequence. ... 

Fig. 14.7 (a) Measured resonant mode spectral shift for increasing concentrations of target oligonucleotides. The line fit is a Michaelis Menton curve with a Kd of 2.9 nM and a maximum resonant wavelength shift of 5.1 pm. (b) Measured resonant mode shift for oligonucleotides of increasing number of base pair mismatches with the capture probe. Reprinted from Ref. 32 with permission. 2008 Elsevier... 

Figure 15. Mass misfit for two sequences of dynamic mode shifted by one mass. It is assumed that coincidence is obtained between Mo for the first sequence and Mo for the second sequence. The parameter SM (exaggerated) represents the misfit one mass down this peak.

Overlap of C-H stretching modes, shifted by anhar- monic effects,... 

Using a simple method of separating the two different contributions to the mode shifts, coupling constants were derived in Ref. [7] that are in good general agreement with those measured using PES. However, the simple interpretation used there has no firm theoretical foundation and so it remains uncertain as to whether... 

The presence of e-p coupling provides an additional channel for the relaxation of phonon states leading to an increase in phonon linewidths [13]. In addition, the modes shift in frequency due to the coupling. The magnitude of the induced shift A[Pg.341]

Fig. 5. Comparison of the h% coupling constants extracted from PES (—3—) data with those deduced from the doping-induced mode shifts (-7-)-...

Table 3.5. Best-model parameters of the temperature-dependent phonon mode shift in Fig. 3.11b, calculated by (3.22) (Bose-Einstein model) [43]...

In the salts of Cgo with K+ and Rb+, the Ag breathing mode at 1,467 cm-1 has been investigated by Raman spectroscopy. This mode shifts from 1,467 cm-1 in neat C60 to lower frequencies as one follows the doping process (salt formation). For the K3C6o salt (57), the shift is from 1,467 cm 1 to 1,445 cm-1. For the Rb3C6o salt (58), the shift is from 1,467 cm-1 to 1,447 cm-1. If the doping is allowed to continue, the shift is lowered... 

SI, Ge, Sn and Pb metal atoms initially reacted with water on cocondensation to form the metal atom-water molecule adduct as has been generally observed for metal atom-water reactions ( ). The shift in the water bending mode frequency on adduct formation decreases with increasing atomic number as illustrated in Table I. Using the results obtained from theoretical studies ( 3, 5), it is believed that the water bending mode shift might serve as a relative measure of the extent of interaction between the water molecule and the metal atom, for metals within a particular group. 

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