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Biomedical subjects

G H Thomas

Publications and source records attributed to G H Thomas.

At least 163 records · Page 9Linked to original sources
PubMed1972

Biological damage from intranuclear tritium: DNA strand breaks and their repair.

Isotopic decay in tritiated thymidine in the DNA of frozen (-196 degrees C) Chinese hamster cells causes breaks in DNA strands to accumulate at a rate of 2.1 breaks per decay. After DNA is thawed the tritium-induced breaks repair rapidly with a half-time of 15 minutes at 37 degrees C. In comparison to breakage by x-rays, the efficiency of DNA strand breakage by tritium is equivalent to 0.48 rad per decay. This dose per decay is close to that predicted by simple dosimetric considerations (0.38 rad per decay) for irradiation by the beta particles from tritium.

Animals↗
PubMed1972

Morphological responses of prostatic carcinoma to testosterone in organ culture.

Slices of human prostatic adenocarcinoma obtained by transurethral resection were maintained in organ culture for 4 days. Preservation of histological appearance was good with little evidence of necrosis within the viable tissue. Slices of tumour cultured in the presence of testosterone showed a morphological change to a more differentiated type of neoplasm whereas explants cultured in the absence of steroid hormone, or with stilboestrol diphosphate, showed no change. In the case of a relatively anaplastic tumour, testosterone produced a significant increase in the number of mitotic figures seen.

Adenocarcinoma↗
PubMed1972

Oestrogen metabolism in cultured human breast tumours.

The interconversion of tritium labelled oestrone and oestradiol-17β has been investigated in human breast tumours maintained in organ culture for 3 days. Benign tumours were significantly different from scirrhous carcinomata both in the concentration of radioactivity taken up by the tissue and in the ratios of oestradiol-17β/oestrone achieved. The fact that malignant tumours were able to convert oestrone to oestradiol-17β is of interest in view of the relatively high plasma levels of oestrone in post-menopausal women.

Adenocarcinoma, Scirrhous↗