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Summary An animal that has previously been injected with 228 Th has a significant steady-state concentration of 212 Pb in its blood. The steady-state nature of the system offers several unusual aspects for the study of removal of lead from blood by chelating agents. First, the system regenerates...
Summary The effects of 2000 r of x-rays on the structure of the epiphyseal plate of the tibiae of 3 weeks and 12 weeks old mice are described. The initial effects were the disorganization of the epiphyseal plate due to the death of actively dividing cells and the cessation of cell erosion at the...
Summary Silini and Hornsey (1962) measured the survival of a strain of mouse ascites tumour cells after x-irradiation using an in vivo technique in which surviving cells were assayed in very young mice. Since then the same strain of cells has been cultured in vitro for 2 years and during this...
Summary The histological changes in the hair-bulbs of young rats exposed to a wholebody irradiation of 500 r were investigated by autoradiography. 3H-thymidine was injected at various times before and after the irradiation, and the percentages of labelled pycnotic and mitotic nuclei were scored...
Summary Thiol binding reagents such as N-ethyl maleimide, iodoacetamide, and chloromercuribenzoate are known to potentiate or sensitize the radiation inactivation of bacteria. These agents have been tested for their ability to sensitize mice when injected intraperitoneally immediately before...
Summary Prolonged incubation revealed that single cells of bottle cultures of HeLa cells may survive even 20 000 r to form colonies of apparently normal cells with unimpaired growth capacity and sensitivity for virus.
Summary Eier von Drosophila melanogaster wurden auf zwei verschieden strahlenemp-findlichen Stadien der ersten Furchungsteilung (Inter-/Prophase und Ana-/Telophase) röntgenbestrahlt, und zwar in jedem Stadium mit einer anderen Dosis (1000 R bzw. 650 R). Dadurch wurden trotz verschiedener...
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