Secondary Peak

Campbell and Herring (1987) isolated and partially purified a red fluorescent protein from the suborbital light organs of M. niger. The absorption spectrum of this red fluorescent protein had a peak at 612 nm, a shoulder at 555 nm, and a secondary peak at 490 nm. 

Fig. T A shows the GPC traces obtained at wavelength 2 k and 3U0 nm for a 312 nm Dow latex sample. Note the response at 3 0 nm is at twenty-five times the sensitivity of the response at 25 nm and hence considerably exaggerated in comparison. At 25 nm two peaks are clearly noted, a polymer peak and a secondary peak whose retention volume corresponds to that of styrene monomer. At 3 0 nm, since neither monomer nor polymer absorb, the observed peak is attributable to the presence of additives such as emulsifier.

Targets are adapted by replacing all negative values by zero. Furthermore, all secondary peaks or shoulders are removed. Some typical examples are given in Fig. 34.21. 

Figure 41.4 shows a typical XRD (X-Ray Diffraction) pattern of TUD-1, along with a TEM image (12). Similar to other mesoporous materials, TUD-1 has a broad peak at low 20. However, it has a broad background peak, commonly called an amorphous halo, and lacks any secondary peaks that are evident for example in the hexagonal MCM-41 and cubic MCM-48 structures. The TEM shows that the pores have no apparent periodicity. In this example the pore diameter is about 5 nm. 

Fig. 1 (left panel) shows the radial velocity distribution of selected stars. We estimate a main peak of Vr 220 7 km s 1, in good agreement with previous measurements based on RGB stars [2]. A secondary peak appears at Vr 180 7 km s-1. This dichotomy is shown in the right panel of Fig. 1, where the radial velocity is plotted as s function of the distance from the centre. 

Bronopol Same as under Bromopheneramine Maleate 1 pi Solution A Solution B Solutions (1), (2) and (3) Calculate ratio for sample and internal stand, from soln. (1) for soln. (3) ratio of area of any secondary peak and is not > y. 

Lepista, Mycena species) and symbionts (particularly the edible species X. badius, X. chrysenteron and Lactarius spp.)- The decrease in Cs specific activity with increasing depth of the mineral soil has one particularly important ecological consequence the coincidence of species-specific rhizospere with a variable load of radioactivity generates inter-specific differences in I37(3g accumulation. For authomorphous soil types, a decrease in radionuclide content with depth is common, but the gradient of this decrease is quite variable (Fig. 4). In some soddy-weakly-podzolic soils, the vertical distribution of specific activity is quite uniform, but in others, secondary peaks of activity were associated with the presence of heavier soil at various depths (6-12cm 16-20cm). However, overall, the vertical distribution of Cs activity was comparable in all the soils analysed. 

The system suitability tests are performed to verify that the analytical system meets predefined acceptance criteria at the time of performance. System suitability parameters should be established based on the type of method being considered and before the validation of the method actually starts. A common method of system suitability will request bracketing reference injections, with measurable quantitative acceptance criteria, such a migration time and/or a range on the main peak area. The peak of interest can be the major peak but it can also be a secondary peak, which may give more control over the sample preparation (e.g., the HMW peaks in non-reduced CE-SDS or incomplete reduced in the case of reduced CE-SDS LIE). 

The mass spectrum of SOAz is shown Fig. 38 and its pattern is quite different from that of MYKO 63 in fact we no longer observe the fall of the Az leaves which characterizes any mass spectrum within the MYKO 63 series. The base peak is at m/z 320 and there are very few other secondary peaks till m/z 50. No chlorinated impurity could be detected either by mass spectrometry or by neutron activation. 

Fig. 2.5 An ion kinetic energy distribution of field desorbed He ions taken with a pulsed-laser time-of-flight atom-probe. In pulsed-laser stimulated field desorption of field adsorbed atoms, atoms are thermally desorbed from the surface by pulsed-laser heating. When they pass through the field ionization zone, they are field ionized. Therefore the ion energy distribution is in every respect the same as those in ordinary field ionization. Beside the sharp onset, there are also secondary peaks due to a resonance tunneling effect as discussed in the text. The onset flight time is indicated by to, and resonance peak positions are indicated by arrows. Resonance peaks are pronounced only if ions are collected from a flat area of the...

Fig. 2.6 (a) Field ion energy distributions of H+, Hj and H3 ions obtained by Jason et al.21 Secondary peaks due to resonance field ionization are most pronounced for f/J. are formed right near the surface, and no low energy tail... 

The secondary peak structures are observed only if the field is at least 10% above the best image field. These structures are especially pronounced if ions are collected from the flat area of the tip surface, for example from the middle of the (110) surface of a tungsten tip. When ions are collected from a kink site atoms of the W (110) plane step, the secondary structures are washed out. It is particularly interesting that in field ionization of hydrogen, secondary peaks are very pronounced for H+ and Hj ions but not HJ ions, as is shown in Fig. 2.6. The H3 peak is very sharp, indicating that ions are produced only right at the surface.22 This can be understood from the fact that H3 molecules are unstable in free space. It is formed by field induced polymerization and exist only in the field adsorption state, as will be further discussed.33... 

Fig. 2.24 Portion of a time-of-flight spectrum in pulsed-laser stimulated field evaporation of a Rh tip in 2 x 10 8 Torr of 4He. Besides the formation of 4HeRh2+, the Rh2+ line now shows a low energy peak of 51 eV additional energy deficit (shaded). Rh2+ ions in this secondary peak are produced by field dissociation of 4HeRh2+ in the field dissociation zone which is about 150 A in width and is centered at —220 A above the tip surface.

Using the field distribution of eq. (2.13), one can show that the peak position of the secondary peak is given by,... 

In contradistinction to the spectra obtained in the mica dispersion, Pseudocyanine, when added to the colloidal silver and silver halide systems of Figures IB and 1C, yielded no H-bands but formed well defined J-bands. The latter also exhibited a weak secondary peak located near the absorption maximum of dissolved, unperturbed dye. Although the position and intensity of the J-band varied with the substrate (4, 17, 38, 61), the differential spectra obtained in these silver systems exhibited marked similarities. An increase in the concentration of the substrate produced in both cases a monotonic change in the absorbance of the M-... 

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