The secondary ion mass spectrometry method (ToF-SIMS) has been applied to the analysis of some mineral and organic species on the surface layers of airborne urban particulates. Particulate matter was collected on aluminum sheets of the 8-stage Anderson type cascade impactor from three different sampling sites in the city of Lodz, Poland, which were different in terms of aerosol source apportionment. The obtained results show that vehicle combustion products occur mainly in fine fraction with aerodynamic diameters below 1µm. The main contribution to the mineral components comes from direct and traffic related soil resuspension. [...]
Community diversity of the activated sludge and the type of accumulated PHAs were investigated in this study. Fed-batch culture was carried out using medium culture containing sodium acetate as a carbon source. A factor triggering PHAs synthesis was a lack of nitrogen. The medium culture containing ammonium was periodically fed into bacterial culture for 6 hours each day of the experiment. Genetic analysis of the bacterial community was performed using 16S and 23S rRNA Intergeneric Spacer Region. The obtained results showed that the dominant belonged to the Betaproteobacteria class. In this study, the Time of flight - Secondary Ion Mass Spectrometry was used. This method revealed that the cells of the microorganisms contained mainly monomer units of 3-hydroxybutryric acid. The content of P(3HB) in dry weight accounted for 51% between 72nd and 120th hour of the experiment.