Total arsenic concentration in the edible part of mussels Mytilus galloprovincialis was evaluated seasonally in the coastal area of Rijeka Bay (North Adriatic Sea, Croatia). Sampling stations were located close to the City of Bakar with no industrial facilities (site 1), in the vicinity of the oil refinery and oil thermoelectric power plant (Urinj, site 2), and 4 miles away from the Plomin coal thermoelectric power plant (Brseč village, site 3). Additionally, the concentration of arsenic in the tail muscle of the lobster Nephrops norvegicus, collected in Rijeka Bay, was studied. During winter at sites 2 and 3, the total arsenic in the edible part of the mussels was 16.4 mg As/kg FW (FW=fresh weight) and 4.38 mg As/ kg FW, respectively, and increased during springtime at site 2 (6.5 mg As/kg FW) compared to the rest of the year, when individual total arsenic concentration at all sites ranged from 1.7 to 3.7 mg As/kg FW. In the winter (sites 2 and 3) and springtime (site 2) there was no correlation between the length of the mussel shell and the arsenic concentration in the edible part of the mussels. In the other seasons, at sites 1, 2 and 3, there was a correlation between arsenic in the edible part of mussels and shell length in most cases (correlation coefficients r varied from 0.64 to 0.85; P <0.05 to P <0.01). Correlation between shell length (in the narrow range of shell lengths from 3.4 to 5.0 cm) and arsenic in the edible part of the mussels shows linearity with a high regression coefficient ( r =0.914; P <0.001). The increase of arsenic in the mussels during winter and spring was suggested at least partially as a result of a low nutritional status, i.e. reduced weight of the mussels' edible part during winter. In addition, a linear relationship was found between body length and arsenic concentration in the tail muscle (mean 17.11€4.48 mg As/kg FW) of the Norway lobster.

Objective: The aim of this study was to determine ABO and RhD blood group distribution in nasal polyposis (NP) patients and whether there is a specific ABO or RhD blood phenotype associated with susceptibility to or protection with respect to development of NP. Methods:The study group comprised 126 consecutive patients with chronic rhinosinusitis and bilateral NP. The control group comprised 126 healthy blood donors. All participants were from the same geographical region. Distribution of ABO and RhD phenotypes in all participants was studied.Results: There were no significant differences between patients and controls in the distribution of the A (p=0.520), B (p=0.306), AB (p=0.673), O (p=0.894), and RhD (p=0.742) phenotypes. Conclusion:According to the present results, the ABO and RhD blood group systems are not associated with development of NP.