The intense 169 m/z ion detected in the mass spectrum
of the reaction A derivative suggested a 17-keto group.
A), A representative mass spectrum
(IgG M-protein) used for manually gating using the perpendicular drop method.
This approach has significant technical challenges, in that not all resistance factors lead to recognizable ion fragments in a whole bacteria MALDI-TOF experiment; and the ones that do can, of course, undergo genetic changes which may or may not impact the antibiotic resistance phenotype but can alter the appearance of the mass spectrum
The model mass spectrum
(10) is logarithmically symmetric and the main spectral nodes arise on the distance of 1 and 1/2 logarithmic units, as fig.
The mass spectrum
of compound(4) determined by Electron impact mass spectrometry (EIMS) exhibited a prominent molecular ion peak ([M.
The sample was analyzed by electro-spray mass spectrometry, LCQ-Deca, and the resulting spectrum was compared to that of a control mass spectrum
of cytochrome C.
Some researchers have applied all data points from a mass spectrum
as inputs to a neural network with an output for each classification (Klawun and Wilkins, 1996).
The essential requirement to obtain a mass spectrum
is to produce ions in a gas phase, accelerate them to a specific velocity using electric fields, project them into a suitable mass analyser that separates the entities by masses, and finally to detect each charged entity of particular masses sequentially in time (3).
Matrix assisted laser desorption ionization/time-of-flight-mass spectrometry is then used to produce a mass spectrum
that is analyzed to determine if one or more proteins associated with the bacteriophage are present, thereby indirectly indicating that target bacterium were present in the liquid mixture.
The QP-2010 Plus is also equipped with software allowing simultaneous Scan/SIM modes that enable detailed information on compounds of interest without sacrificing data across the entire mass spectrum
Then students analyze the mass spectrum
data from Robert's air samples to solve the puzzle of whether the haze blew in over the water to the west or came from forest fires to the east.
Figure 1 shows an example of a MALDI mass spectrum
of a sample of polytetramethylene glycol (PTMEG) 1000.