The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Ions with the general formula M(CH 3 OH) 2+n (4 ≤ n ≤ 8) and M = Mn or Fe react with ammonia in the collision region of a triple quadrupole mass spectrometer. The addition product M(CH 3 OH) n NH 2+3 is not observed. The ions that are observed can be assigned to products of proton transfer and substitution reactions. For the complex ions...
The high-energy collision-induced dissociation (CID) spectra of a number of peptides containing S-β-(4-pyridylethyl)-, S-carbamidomethyl- and S-carboxymethylcysteine have been generated and several hitherto undescribed fragmentation pathways identified. For peptides containing pyridylethylcysteine at the nth position, these include x n -105, a n+1 + 1 - 106, a n ...
Amipurimycin is a natural nucleoside that displays a remarkable activity in vitro and in vivo against Pyricularia oryzae, which is responsible for the rice blast disease. Six important precursors for the synthesis of the Amipurimycin sugar moiety were prepared. In order to obtain structural information a mass spectrometric study of these compounds was performed using liquid secondary ion mass spectrometry...
Homopolymers and copolymers of 1-isocyanato-4,4,5,5,6,6,7,7,8,8,9,9,9-tridecafluorononane (monomer F) and n-hexylisocyanate (monomer H) were examined by desorption chemical ionization mass spectrometry (DCI-MS) to obtain information on the monomer distribution in the copolymers. Tandem mass spectrometry (MS/MS) was used to characterize ions generated by DCI in the mass spectrometer ion source; ammonia...
Stage-specific embryonic antigen (SSEA) glycosphingolipids (GSLs) found in the central nervous system are implicated in regulating cell-cell recognition, targeting and migration of cells during development. Through the action of fucosyltransferase enzymes, SSEA-1 (Lewis x ) glycolipids are biosynthesized in the brain by fucosylation of lipid substrates with the neolacto series glycolipid...
A new mode of operation for an in-line surface induced dissociation device in a tandem four sector instrument was developed based on SIMION ion trajectory calculations. The calculations predict that a double deflection mode of operation provides a more focused precursor ion beam at the target electrode compared to a single deflection mode and suggests improved SID efficiencies might be obtained....
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.