[en] The topical day has been focussed on the potential effects of ionizing radiation on human health. A general overview on molecular and biophysical aspects of radiation, its effects on cells and organisms, and the contribution of radiobiology to radiation protection and risk assessment is given. The genetic effects of radiation and its effects on the developing organism, the effects of radiation on the cell cycle and the mechanisms of radiation induced apoptosis were also discussed

[en] T cells from the spleens of C57BL 10 (H-2sup(b)) mice 7 to 12 days after immunization with P815Y (H-2sup(d)) mastocytoma cells have been shown to co-operate synergistically with an adherent component of non-immune starch induced peritoneal cells in the cytostasis of target cells. Although significant values for synergy could be obtained using the (¹²⁵I) UdR incorporation assay to measure cytostasis, normal peritoneal cells were incapable of co-operating with T cells in cytolysis as measured by ⁵¹Cr release from pre-labelled target cells. Initially, the synergistic interaction was immunologically specific, but non-specific activity could be induced by challenge with specific antigen. (author)

[en] Short-term experiments were conducted to determine the effect of varying levels of iron and manganese on ⁶⁵Zn absorption by roots and translocation to shoots in soybean seedlings. In 11 hours uptake duration, both iron and manganese depressed the ⁶⁵Zn absorption by roots and translocation to shoots. The depression was of higher magnitude at higher levels of iron and manganese (5.0 ppm) in the medium coupled with highest level (5.0 ppm) of zinc concentration. It is concluded that interactions between zinc and iron as well as zinc and manganese occur during absorption and translocation processes

[en] A case patient with hepatic disease and pumnonary infeccion, for which retention by both lings is cearly visualized following an injection of ¹¹³ sup(m)In-haemacell for liver scannin, is presented

[en] Mouse and rat spleens were investigated in dynamics by the morphometry and electron microscopy methods; for 1-2 years mice and rats were receiving ¹³⁷Cs, ²²⁶Ra, ⁸⁹Sr, ⁶⁵Zn, Pb(NO₃)₂, BeCI₂ etc., added into potable water. It is established, that reactive rebuilding under both chemical and radiation effects occurs in three directions: lymphoid tissue hyperplasia, plasmocytogenesis amplification as well as hyperplasia of extramedullary blood formation. At strong total received doses (160-200 rad) atrophy, amyloid spleen degeneration or leucosis symptoms were observed in 1-2 years. Disturbance of intercellular contacts and intracellular regeneration processes has been determined by the electron microscopy

[en] The distribution and retention of intravenously administered indium (sup(113m)InCl₃) were determined in pregnant female rats. The highest accumulation of indium was found in the placenta during the last period of pregnancy. Five hours after administration the retention of indium in the placenta was about 38% of the administered dose. In the fetuses of these females the amount of radioactive indium did not exceed 1% of the injected dose. In the last period of pregnancy the placenta is the critical organ for intravenously administered indium (InCl₃). (author)

No abstract available

[en] Two of three lactating goats confined in metabolism stalls were each given a single oral dose of citrate-buffered neptunium-234 chloride, and the third goat was given a single intravenous dose. During the next 5 days, blood samples and all of the milk, urine, and feces from the goats were collected for neptunium-234 analysis

[en] Incorporation of organically bound tritium (OBT) and tritiated water into the separate chemical constituents of rat liver has been investigated. The specific radioactivity of tritium was higher by a factor of 2-3 after the OBT administration than after ³HOH, in all the examined fractions. The highest specific radioactivity was in the phospholipid fraction and the lowest in the nucleic acid fraction. (author)

[en] The distribution of [¹⁴C]-labelled aflatoxin B₁ has been studied in mice with the aid of whole-body autoradiography. In addition to the localisation of labelled aflatoxin B₁ and/or its metabolites in the liver, bile, kidney, lung and urine an uptake of ¹⁴C in the pigment of the Harderian gland and the eye was observed. Uptake of radioactivity was also found in the eyes of the foetuses although their livers did not accumulate radioactivity. (author)