Scan table

Table 2 SRM scan table and HPLC retention times...

Whereas TOF instruments solely allow for the detection of product ions of a selected precursor, sector instruments offer additional modes of operation i) to exclusively identify product ions of a particular precursor ion, so-called precursor ion scans, [92,93] or ii) to detect only ions formed by loss of a specific neutral mass, so-called constant neutral loss (CNL) scan. [94] This can be achieved by some technically more demanding linked scans (Table 4.2). [95-98]... 

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Examine Sec. 9.1.3, and determine what constitutes a system similar to the system under consideration. Then scan Table 11.1, marking all the data for similar systems. 

Acetonitrile and methylene chloride are typically good solvents for extending the window for anodic scans, while tetrahydrofuran (THF), N,N-dimethylformamide (DMF), and dimethyl sulfoxide (DMSO) are typically good solvents for extending the potential window for cathodic scans (Table 2). 

Fig. 2.17. Schematic layout of a microscope spectrophotometer system used to measure polarized absorption spectra of very small mineral crystals. The computer-operated, single-beam instrument shown here comprises a polarizing microscope equipped with a stabilized light source (xenon arc lamp or tungsten lamp cover the range 250-2000 nm), a modulator that chops the light beam with a frequency of 50 Hz (the amplifier for the photodetector signals is modulated with the same phase and frequency), and a Zeiss prism double monochromator. Single crystals as small as 10 ji.m diameter may be measured with this system. A diamond-windowed high-pressure cell can be readily mounted on the microscope scanning table for spectral measurements at very high pressures (after Burns, 1985, reproduced with the publisher s permission).

The meander shaped scanning of the chromatograms has been realized by a computer-controlled instrument (look part 5.2.1). The computer directs the scanning table so that the sample spots are scanned in the meander mode in the direction of the chromatography. 

Recently Kaiser and collaborators have developed new possibilities by means of a computer-controlled system 4i,44). They have coupled a desk computer (Apple II) via an AD-converter to the signal output of a Camag-scanner. Additionally, the computer is connected to the control electronics of the scanning table of the densitometer. Thus the transmission of the raw measuring data and the computer-control of the automatic scan is possible. 

If the plate structure is to be subtracted from the raw data, the plates are measured precisely on those tracks on which later on chromatography is performed. Here it is necessary for the plates on the scanning table to be repeatedly positioned very precisely. This method, however, only works in connection with the anticircular-technique 45>. The extensive data material obtained is stored on so-called floppy discs . 

Similarly, the origin of the m/z 217 ions in the same mixtures showed M ions with C22, C27, C2S, and C29. The only comment here is that numerous isomers exist for each family of terpanes and steranes, but they are not detailed in this work. In addition, the comparison of the results obtained with GC/MS and with HV scan (Table 6) demonstrate a satisfying analogy. 

When using conventional geometry instruments, HV scan method combined with high resolution may occasionally be effective. In this way. Das and co-workers [213a,b] studied the components of pithamycolide fractions of extracts from Pithomyces chartarum cultures. The elucidation of structure of dipeptide has been done by this method. The measurements of the main peaks obtained in El under high-resolution conditions furnished the results shown in Table 20, and these enabled a true family tree to be generated when combined with the determination of their precursor ions (by HV scan) (Table 21). 

Chemical properties and coverage of the modified surface were characterized by XPS. Figure 10.4 shows the carbon (Is) narrow spectra of the modified surfaces. The coverage of modified surface was calculated by using the integrated peak areas of the carbon (Is) and silicon (2p) XPS narrow scans. Table 10.1 lists the ratio of organic adsorbates per aU reaction sites of ideal quartz surface, and the... 

If the travel range of the scanning table is 180 cm, and the displacement distance between the centers of the scan fields of CT and PET scanners is 60 cm, what is the maximum body length that can be scanned in this PET/CT scanner ... 

After the waiting period, the patient lies supine on the scan table with the head toward the PET scanner, and with arms up or down depending on the area to be scanned. 

The patient lies supine on the scan table with arms up away from the field of the heart. Position the patient in the scanner with the heart in the axial field of view. 

A typical scan function, or scan table, for a forward mass scan performed by the DIT is shown in Figure 12.6. The scan function differs substantially from that used in QIT experiments. Time is reported on the abscissa, while the period (T) of the... 

FIGURE 12.6 A typical scan table for a forward mass scan of the digital ion trap. 

Amperometry. Amperometry has traditionally been concerned with maintaining a fixed potential between two electrodes, but pulsed techniques have recently attracted considerable attention as well. The applied potential at which current measurements are made is usually selected to correspond to the mass-transport-limited portion of the corresponding voltammetric scan. Table 9 summarizes the various amperometric methods. 

The patients for WB-CT imaging have to be carefully selected and separated from those not needing a full-body scan. Table 42.3 shows parameters that are indicating suspicion of multisystem trauma. If any of these parameters is present, then WB-CT should be considered, even in younger subjects. 

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