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1

Qualitative analysis of stress proteins induced by cadmium in the mussel Mytilus trossulus

100%

Radlowska M., Pempkowiak J.

Oceanological Studies

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1996

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vol. 25

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issue 3

133-137

EN

The exposure of the blue mussel Mytilus trossulus to increased concentration of cadmium in seawater resulted in the synthesis of a new protein of the approximate molecular weight of 60 kDa. This protein is immunologically crossreactive with the 60 kDa heat shock protein of the moth Heliothis virescens. The latter one is a member of a highly conserved family of proteins found in animals at various levels of organization. This result indicates that changes in the abundance of stress proteins may prove useful as a biomarket of mussels exposure to specific toxicants.

2

Distribution of cadmium in the inner organs of Mytilus trossulus during Short-Term exposure of the mussels in the sea water containing different concentrations of metal

100%

Kozuch J.

Oceanological Studies

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1996

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vol. 25

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issue 3

123-131

EN

The experiments of short-term exposure of Mytilus trossulus to cadmium in sea water were carried out in laboratory conditions. The mussels were picked up from the Gulf of Gda?sk and kept in the seawater of temperature 10oC and salinity 7%. The solution of CdCl2 containing radioactiwe isotope of cadmium 115mCd (T1/2 = 43 days) was added to the water and used as a metal tracer. The isotope's specific activity was in the range from 2000 to 10000 Bq115mCd?dm-3, which is equal to the range of 2-10 mgCd?dm-3 of stable cadmium in the water. The time of exposure varied from 10 minutes to 24 hours. A distinct increase in the specific activity of radiocadmium in the soft tissue of the analysed mussels was observed. Thin increase was proportional to the increase in the specific activity of cadmium in water and to the time of exposure. The distribution of the accumulated metal in various inner organs of mussels was not stable in time. At the beginning of exposure (first hour) the biggest concentration of the metal was noticed in gills, smaller in hepatopancreas and the smallest in the remaining soft tissue containing mostly mantle and muscles. After the sec-ond hour and during the remaining 23 hours of exposure the biggest amounts of the accumu-lated metal were found in hepatopancreas. The concentration of radiocadmium in the rest of the soft tissue remained the lowest throughout the exposure.

3

Accumulation of polonium by mytilus trossulus under experimental conditions

100%

Stepnowski P., Kozuch J.

Oceanological Studies

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1999

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vol. 28

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issue 1-2

73-82

EN

The bioaccumulation of polonium in the Baltic mussel Mytilus trossulus was studied experi-mentally in an attempt to discover the differences between food and water as sources of polonium. The 209Po isotope was used as tracer for accumulation and excretion. The highest 209Po con-centration was found in the hepatopancreas of mussels exposed to spiked water for 24 days. Both parts of the experiment (exposure to food and water) showed that while the rate of bioaccumula-tion of polonium by Mytilus trossulus was very high, the excretion rate was also relatively high. Furthermore, in both cases the duration of the accumulation-excretion (a-e) cycle of polonium in Mytilus trossulus was 10 days. Finally, a simple mathematical model approximating the experimental data was developed.

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3 Oceanological Studies

1 1999

2 1996

2 Kozuch J.

1 Pempkowiak J.

1 Radlowska M.

1 Stepnowski P.

Qualitative analysis of stress proteins induced by cadmium in the mussel Mytilus trossulus

Distribution of cadmium in the inner organs of Mytilus trossulus during Short-Term exposure of the mussels in the sea water containing different concentrations of metal

Accumulation of polonium by mytilus trossulus under experimental conditions