Biophysik
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Microwave irradiation and in vitro release of enzymes from hepatic lysosomes
Biophysik - Tập 18 - Trang 129-136 - 1980
An exposure system for examining in vitro effects of microwave irradiation on cellular and subcellar components has been developed. The system was used to test the effect of 2.45-GHz CW microwaves on the release of two lysosomal enzymes. At a specific absorption rate (SAR) of 10, 50 or 100 mW/g (90 min) no effects were noted at 37° C (pH of 7.3) on lysosomal fragility as determined by the release ...... hiện toàn bộ
Linear and sigmoid dose-effect relations: Investigations with gamma-irradiated thymine-(methyl-T) in aqueous solution and in the solid state
Biophysik - Tập 11 - Trang 69-77 - 1974
The example of thymine-(methyl-T) demonstrates that in the case of radiation damage to one type of molecule different dose-effect curves will occur depending on the state of the molecule. Radiation-induced tritium cleavage from an aerated aqueous solution of thymine-(methyl-T) shows a linear dose dependence without threshold, tritium cleavage from solid thymine-(methyl-T) follows a sigmoid dose-ef...... hiện toàn bộ
Similarities between human ataxia fibroblasts and murine SCID cells: High sensitivity to γ rays and high frequency of methotrexate-induced DHFR gene amplification, but normal radiosensitivity to densely ionizing α particles
Biophysik - Tập 33 - Trang 201-210 - 1994
Twoγ-ray hypersensitive cell lines, human ataxia telangiectasia (AT) and murine severe combined immune deficiency (SCID) cells, proved to be very competent in amplifying their dihydrofolate reductase (DHFR) gene under methotrexate selection stress. Over a period of months, methotrexate-resistant clones were obtained which were able to grow in progressively increasing methotrexate concentrations up...... hiện toàn bộ
Increased catabolism of muscle proteins as a manifestation of radiation myopathy
Biophysik - Tập 26 - Trang 171-180 - 1987
Exposure of the hindquarter of the rat to 1000 rad of gamma-radiation caused a significant increase in the release of glutamine and alanine into the perfusion fluid at 4 h post-irradiation. The extent of the release of glutamine exceeded that of alanine. Furthermore, the exposure to gamma-radiation brought about a significant lowering of the intra-/extracellular concentration gradient with respect...... hiện toàn bộ
Cross section calculations for electron scattering from DNA and RNA bases
Biophysik - Tập 42 Số 3 - Trang 201-211 - 2003
Ultrasonography survey and thyroid cancer in the Fukushima Prefecture
Biophysik - Tập 53 - Trang 391-401 - 2014
Thyroid cancer is one of the major health concerns after the accident in the Fukushima Dai-ichi nuclear power station (NPS). Currently, ultrasonography surveys are being performed for persons residing in the Fukushima Prefecture at the time of the accident with an age of up to 18 years. Here, the expected thyroid cancer prevalence in the Fukushima Prefecture is assessed based on an ultrasonography...... hiện toàn bộ
Reduced side effects by proton microchannel radiotherapy: study in a human skin model
Biophysik - - 2012
The application of a microchannel proton irradiation was compared to homogeneous irradiation in a three-dimensional human skin model. The goal is to minimize the risk of normal tissue damage by microchannel irradiation, while preserving local tumor control through a homogeneous irradiation of the tumor that is achieved because of beam widening with increasing track length. 20 MeV protons were admi...... hiện toàn bộ
Is there reliable experimental evidence for different dicentric yields in human lymphocytes produced by mammography X-rays free-in-air and within a phantom?
Biophysik - Tập 44 - Trang 17-22 - 2005
We examined the production of dicentrics in human lymphocytes irradiated with 29 kV X-rays to a depth of 13.5 mm in a PMMA phantom. For these irradiation conditions, which are appropriate for the diagnostic application of mammography X-rays, a coefficient α of (5.88±0.66)×10−2 Gy−1 of the linear quadratic dose–response relationship was determined. This value does not differ significantly from the ...... hiện toàn bộ
The growth of fractal humic acids: Cluster correlation and gel formation
Biophysik - Tập 33 Số 3 - Trang 269-276 - 1994
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