Flooding modifies the genotoxic effects of pollution on a worm, a mussel and two fish species from the Sava River.

Extreme hydrological events, such as water scarcity and flooding, can modify the effect of other stressors present in aquatic environment, which could result in the significant changes in the ecosystem functioning. Presence and interaction of various stressors (genotoxic pollutants) in the environment can influence the integrity of DNA molecules in aquatic organisms which can be negatively reflected on the individual, population and community levels. Therefore, in this study we have investigated the impact of flooding, in terms of genotoxicity, on organisms belonging to different trophic levels.

Natural radioactivity levels for selected kinds of Egyptian sand.

The monitoring and evaluation of natural radioactivity content of sixty-five different samples of sand used in building materials, black sand and its components, and therapy sand collected from different locations in Egypt have been investigated. The specific radioactivity concentration of 238U, 232Th series, and 40K were measured by gamma-ray spectrometer using a shielded HPGe. The obtained results of 238U and 232Th series as well as 40K are discussed.