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Positive- and negative-ion mass spectra from a diesel particle recorded using ATOFMS. Positive ions from polyaromatic hydrocarbons are indicated in the top panel

Positive- and negative-ion mass spectra from a sea-salt particle recorded by ATOFMS. Reactions with air pollutants during transport have modified the chemical composition, producing sulphate species

Positive- from metastable decay of negative ions of benzopyrene.

Positive- ion MALDI mass spectra of the oligosaccharides obtained from birch wood xylan by mild acid hydrolysis. In positive ion mode, both neutral and acidic oligosaccharides are detected, whereas acidic oligosaccharides only are detected by negative-ion MALDI-MS. Reproduced from Reference 6. Copyright 2001 American Chemical Society.

Positive- nanoESI spectra of an anti-HIV drug from ethanol in the presence of ammonium chloride. By courtesy of H.-C. Kliem and M. Wi-essler, German Cancer Research Center, Heidelberg.

Positive-displacement vacuum pumps. References with permission.

Positive-going sweep of the voliammograms of Pl surfaces investigated with n-2 — 9, 12, 14, 20, 26 and 40 in 0.5 M ll2S04. The sweep rale for all the experiments was 20mVs-1. Displacements of the curves are arbitrary. The inset shows the evolution of the position of the step adsorption state for low values of n. After Parsons and

Positive-going sweep of the voltammograms of Pt surfaces investigated with n 2 — 9, 12, 14, 20, 26 and 40 in O.SM ll2S04. The sweep rate for all the experiments was 20mVs Displacements of the curves are arbitrary. The inset shows the evolution of the position of the step adsorption state for low values of n. After Parsons and

Positive-ion 1137. Copyright 2002, with permission fromJohnWiley Sons .

Positive-ion APCI mass spectra of is a solvent

Positive-ion CSD of CRABP I

Positive-ion desorption electrospray ionization 500pg of RDX. Reproduced with permission from Mulligan et al. .

Positive-ion electrospray ionization tandem mass spectra of choline lyso-glycerophospholipid regioisomers. Positive-ion ESI tandem MS analyses of sodiated 1-hexadecanoy 1-2-hydroxy-in-glycero-3-phosphocholine present in very low abundance. Han and Gross , Reproduced with permission of the American Chemical Society.

Positive-ion electrospray mass spectram of bovine serum albumin of molecular mass 66,300. .

Positive-ion electrospray spectrum obtained from the major component in the LC-MS analysis of a purified recombinant 62 kDa protein using a Cig microbore 50 X 1 mm column and a flow rate of 50 p.lmin . The starting buffer consisted of 0.1 TEA in acetonitrile-water 9

Positive-ion electrospray spectrum obtained from the major component in the LC-MS analysis of a purified recombinant 62 kDa protein using a Cis microbore 50 x 1 mm column and a flow rate of 50 p,lmin 1. The starting buffer consisted of 0.1 TFA in acetonitrile-water 9

Positive-ion electrospray tandem mass spectrum of the ion of the P-casein tryptic phosphopeptide FQpSEEQQQTEDELQDK as obtained upon HPLC coupling to a quadmpole ion trap. Reproduced from Ref. with permission. Springer-Verlag, 2004.

Positive-ion energy distribution from electron bombardment of CO on tungsten at 300 K electron probe as in

Positive-ion energy-dependent ESI-MS of as a representative example.

Positive-ion ES mass spectra of 10 M bovine cytochrome c obtained at different pH values

Positive-ion ESI mass spectra of 1 mM

Positive-ion ESI mass spectra of cytochrome c at different pH of the sprayed solution

Positive-ion ESI mass spectra of cytochrome c same but with medium setting of charge-reducing corona discharge. Adapted from Ref. by permission. American Chemical Society, 2000.

Positive-ion ESI mass spectra of cytochrome c same but with medium setting of charge-reducing corona discharge. Adapted fromRef. by permission. American Chemical Society, 2000.

Positive-ion ESI mass spectrum of CHO IL-4.



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