The mechanism of spoilage of a bottled soft drink leading to health problem of consumer.

The case of spoilage of flavoured and sweetened soft drink occurred in the Czech Republic in 2019. After drinking it, the consumer was admitted to a hospital with sickness. The spoilage was caused by mould and an odorous substance, 1,3-pentadiene.

Characteristics of titanium dioxide microdispersions with different photo-activity suitable for sunscreen formulations.

The aim of the study was the comparison of photo-activity of three types of titanium dioxide (TiO2) micro-dispersions intended for use as UV filters for cosmetic sunscreen products. The dispersions were also investigated with regard to their influence on the stability of photo-protective systems in cosmetic emulsions, their skin penetration/absorption and their photo-toxicity for humans and skin bacterial flora. All the tested micro-dispersions of rutile TiO2 type (agglomerates with diameter 120-150 nm), with primary particle size lower than 100 nm, demonstrated no phototoxic effect and insignificant antimicrobial behaviour.

Effect of recirculation air cleaners on indoor air quality in a children's home.

The subject of this study was to assess the efficacy of the air cleaners provided by the Czech Power Company CEZ, J.S.C.

The concentrations of mixed populations of fungi in indoor air: rooms with and without mould problems; rooms with and without health complaints.

The aim of this study was to establish the concentrations of mixed populations of fungi in indoor air and to attempt to correlate these concentrations and health complaints of residents. We investigated 68 rooms. These were divided into four groups: rooms without moulds on the walls and with/or without complaints; rooms without moulds on the walls and with/or without complaints.

Effect of chemical fertilizers on the transport of Escherichia coli, Pseudomonas aeruginosa and Salmonella infantis through sand columns.

Five commercial fertilizers, Amfos, ammonium sulfate, Kamex, Kieserit and NPK affected the transport of Escherichia coli, Pseudomonas aeruginosa and Salmonella infantis in sand columns. The percentage of cells transported through and without fertilizers during a 2-h period was species-dependent (0.56 for S.