The effects of atomic radiation The effects of atomic radiation on oceanography and fisheries, report effectsofatomicr00nati Year: 1957 82 Atomic Radiation and Oceanography and Fisheries it is evident that at low concentrations all the zinc was removed after about four days. The lowest concentration used was still ten times higher than the average zinc concentration of sea water. The rate of uptake of zinc'^ by Nitzschia cells is shown in Figure 2. At the normal con- FiGURE 2. Uptake of Zinc^^ by Nitzschia Cells from Culture Medium Containing 10 Micrograms of Zinc/Liter. centration of zinc
The effects of atomic radiation The effects of atomic radiation on oceanography and fisheries, report effectsofatomicr00nati Year: 1957 82 Atomic Radiation and Oceanography and Fisheries it is evident that at low concentrations all the zinc was removed after about four days. The lowest concentration used was still ten times higher than the average zinc concentration of sea water. The rate of uptake of zinc'^ by Nitzschia cells is shown in Figure 2. At the normal con- FiGURE 2. Uptake of Zinc^^ by Nitzschia Cells from Culture Medium Containing 10 Micrograms of Zinc/Liter. centration of zinc in sea water, a dividing cul- ture of Nitzschia depleted the zinc'^'' in a closed system in less than one day. Apparently phyto- plankton cells concentrate zinc relative to sea water and any radioactive zinc present in the water will be quickly taken up in large amounts. The radioisotopes so far discussed are very likely always ionic in sea water. Ruthenium solution, however, forms colloids and particles when put into sea water. Ruthenium^o*^ ob- tained as an acid solution from Oak Ridge was added to a sea water culture of Nitzschia cells. Figure 3 shows that the cells continued to take up the ruthenium for the 12 days of the experi- ment. Tlie amount of ruthenium per cell de- creased, however, since the cells of the culture were dividing continually. One may conclude from this experiment, that since the ruthenium concentration in sea water is low, dividing planktonic algae would take up large amounts of any radioactive ruthenium present. Second trophic level The work reported in this section was also done at the Larvae of the brine shrimp Artemia were put into filtered sea water containing radiostrontium and the daughter 16 / <n / UJ / 1;^ / o £ fel2 / D g M J g < \ f t- £ 3 1 8 t 5 ;^ / o I X / (/I / H Z 3 4 O U / Figure 3. Uptake of Ru^*^ by Nitzschia Cultures in the Light. yttrium^'. These larvae rapidly took up the SR*^-Sr^°Y^° and reached an apparent
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