Atypical cytostatic mechanism of N-1-sulfonylcytosine derivatives determined by in vitro screening and computational analysis.

We have previously shown that N-1-sulfonylpyrimidine derivatives have strong antiproliferative activity on human tumor cell lines, whereby 1-(p-toluenesulfonyl)cytosine showed good selectivity with regard to normal cells and was easily synthesized on a large scale. In the present work we have used an interdisciplinary approach to elucidate the compounds' mechanistic class. An augmented number of cell lines (11) has allowed a computational search for compounds with similar activity profiles and/or mechanistic class by integrating our data with the comprehensive DTP-NCI database.

[Etiology of atypical pneumonias in 2002. Results of the Croatian Institute of Public Health].

Aim: This investigation was performed at Department of Virology, Croatian National Institute of Public Health, the same diagnostic laboratory using the same serologic method as in earlier studies (in 1982 and 1992) to determine the incidence of the most common agents of atypical pneumonia in Croatia between January 1 and December 31, 2002.

Patients And Methods: The study included 630 patients from nearly all regions of Croatia with a clinical diagnosis of atypical pneumonia based on epidemiologic data, clinical symptoms, laboratory findings and chest X-rays. Most of them were from Zagreb (n = 370), followed by those from Slavonia, Istria, northwest Croatia, and Dalmatia.

Mass spectrometric investigation of N-sulfonylated purine nucleic bases and nucleosides.

The gas/phase behaviour of N-sulfonylated purine nucleic bases and nucleosides towards electron impact (EI) and matrix-assisted laser desorption/ionization (MALDI) occurring in a ion trap of a Fourier transform ion cyclotron resonance mass spectrometer is investigated. The influence of the storage time on the protonated molecule ([M+H](+)) abundance under EI conditions confirms that the formation of these ions proceeds through ion/molecule reactions. Using stored-waveform inverse Fourier transform (SWIFT) selective isolation of M(+.