The aim of this study was to examine the content of total soluble substance (TSS), total acidity (TA), pH, ascorbic acid content (vitamin C) and total phenols in fresh strawberries, as well as in strawberries stored for 10 days by freezing. Chemical characterization of fresh and frozen strawberries was done on four different varieties: Clery, Maya, Asia, Joly grown in the area of Čelić, Bosnia and Herzegovina. The obtained results showed that frozen strawberries have slightly lower values of TSS, pH, vitamin C, while the content of TA and total phenols was slightly higher in frozen strawberries than in fresh ones, which can be attributed to increasing acidity.

The inventory of amphibians was conducted during 2020 and 2021 in the area of northeastern Bosnia. The conducted research determined 11 species of amphibians, of which three species belong to the tailed amphibians and the other eight to the tailless amphibians. Based on IUCN data, it can be concluded that these are the species with the least concern (LC) status. However, it is evident that the number of natural habitats of amphibians in the investigated area has been significantly reduced, and constant monitoring of the condition of their populations is necessary.

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