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PubMed1971

Ternary Fission.

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Hot Temperature↗
PubMed1983

Role of transferrin in uptake of non-physiological metals into cells.

At physiological concentrations of citrate the uptake of 59Fe, 67Ga, and 239Pu into human type B lymphocytes of splenic origin is the same in viable and in non-viable cells. Addition of transferrin has no effect on the uptake into non-viable cells but in viable cells it increases the uptake of Fe and Ga but decreases that of Pu. Uptake decreases as transferrin concentration increases although this is less marked with Ga.

Biological Transport, Active↗
PubMed1985

Role of transferrin in metal uptake by human lymphoblasts in vitro.

The uptake and binding of 59Fe, 67Ga and 239Pu complexed with citrate of transferrin (Tf) and of 125I-labelled Fe-Tf by human lymphoblasts (WI-L2 cells) have been studied. Uptake kinetics of 59Fe-Tf and [125I]-Tf point to internalization by receptor mediated endocytosis. 67Ga binding and uptake is always less. This may be explained by a lower affinity of Ga-complexes for the cell surface. Factors which influence Fe uptake have a similar effect on Ga. 239Pu uptake and binding, however, are different, especially in that Tf does not stimulate 239Pu uptake and may actually decrease it.

Cell Line↗
PubMed1979

Lung tumors from PuO2-ZrO2 aerosol particles in Syrian hamsters.

Syrian golden hamsters were given PuO2/ZrO2 particles via inhalation and/or Pu-laden ZrO2 ceramic 10-micron diameter microspheres lodged in the capillary bed of the lung. The mean initial lung burdens ranged from 8 nCi to 143 nCi for the six experimental groups of animals. Significant numbers of primary lung tumors (5-50% per group) were induced in those animals that received inhalation exposures. Additional alpha radiation administered via Pu-laden intravenous microspheres had little or no effect on tumorigenesis or the production of non-neoplastic, degenerative changes in the respiratory tract.

Aerosols↗
PubMed1985

Population and ultrastructural changes in murine alveolar cells following 239PuO2 inhalation.

Early changes affecting the principal cellular components of pulmonary alveoli after inhaling 239plutonium dioxide were followed by quantitative and qualitative electron microscopy in mice and rats. Different accumulated doses of a irradiation were achieved. The numbers of alveolar macrophages and interstitial mononuclear cells rose in mice especially after a higher dose of radiation, whilst in rats interstitial fibroblasts were increased. The evidence from mice suggested pronounced secretory activity of type II epithelial cells with subsequent uptake of phospholipid by alveolar macrophages, which developed large cytoplasmic inclusions, but rats were much less severely affected. Pneumonitis was not a feature and with the dosage of radiation employed endothelium escaped structural damage. Sensitivity between species differed, both according to cell type and to intensity of exposure, so demanding caution in the application of experimental findings to man.

Animals↗
PubMed2004

Toxicity to Tradescantia of technogenic radionuclides and their mixture with heavy metals.

The genotoxic effects on Tradescantia of (137)Cs, (90)Sr, and (236, 242)Pu, a heavy metal mixture [Cd, Cr(VI), Cu, Mn(II), Ni, Pb, Zn] and of a complex mixture of these toxicants were determined. The impact of radionuclides on plants subjected to ionizing radiation exposure was estimated. The number of somatic mutations and the quantity of nonviable stamen hairs were used as end points in the testing. An increase in the quantity of nonviable stamen hairs was observed with increasing internal exposure to (137)Cs, (90)Sr, and (236, 242)Pu; however, the number of somatic mutations was not observed to be dependent on ionizing radiation. The internal dose of individual radionuclides necessary to decrease the quantity of viable stamen hairs in Tradescantia by 50% can be arranged in the following sequence: (236, 242)Pu > (137)Cs > (90)Sr. Tradescantia died in the mixture of the radionuclides (90)Sr, (137)Cs, and (236)Pu (5 x 10(-2), 7 x 10(-5), and 4 x 10(-10) Gy, respectively) after 14 days, whereas the heavy metal mixture caused somatic mutations in 3% of the Tradescantia and nonviable stamen hairs in 7% but no mortality. However, the Tradescantia died in a combined mixture of these heavy metals and the radionuclides after 14 days. On the basis of all these observations, it can be concluded that the toxic effect of radionuclides was more significant than that of heavy metals.

Cesium Radioisotopes↗
PubMed1976

Bursa of Fabricus: uptake of radioactive particles and radiotoxic "sealing" of bursal follicles.

Making use of the fact that the avian bursa is uniquely equiped for uptake, degradation and storage of particulate matter from the cloacal lumen, we administered 239Pu(IV) perorally or via the cloaca to cause radiotoxic damage to the bursal tissue. This resulted in a involution of the follicles, reduction of the lymphocyte mass, predominance of smaller lymphoid cells in the medulla as compared to controls, disappearance of tuft epithelia, formation of a sub-epithelial fibrous layer in many follicles and impairment or an almost complete loss of the capacity of the bursa to take up particulate matter. Concomitant with these changes was a reduction in the concentration of serum IgG. These findings are discussed in relation to the immunologic contact role of the bursa.

Animals↗
PubMed1984

Microscopic dose distribution around PuO2 particles in lungs of hamsters, rats, and dogs.

Syrian hamsters, Fischer rats and Beagle dogs inhaled monodisperse aerosols of PuO2 and were sacrificed during the first 16 days after exposure. The microscopic distribution of radiation dose and tissue-at-risk to alpha irradiation around individual particles in lung was studied using autoradiographs of lung tissue sections. The dose distributions in dogs and rats were more diffuse than in hamsters. A slightly greater tumor incidence was calculated for rats and dogs than for hamsters on the basis of dose distribution using the same dose-effect model for all three species. The small differences in tumor incidence predicted on this basis do not explain the extremely large differences in tumor incidences observed in these species after inhalation of PuO2.

Aerosols↗