HUMAN EPIDERMAL CELL CYCLE IN VITROCHOPRA, D. P.; FLAXMAN, B. A.
doi: 10.1111/j.1365-2133.1972.tb05091.xpmid: 5043193
Summary.— Human epidermal cells were propagated in vitro, pulse labelled with tritiated thymidine, fixed at regular intervals thereafter and processed for radioautography. The percentage of labelled mitoses was plotted against time after pulse. From the interval between 2 successive peaks on the curve of labelled mitoses, the length of the cell cycle was found to be 59 hours. The growth fraction or percentage of cells actually involved in proliferation was calculated to be approximately 53.9%. The data are discussed with respect to published data on the human epidermal cell cycle in vivo and the methods by which the data were obtained.
COMBINED SURGICAL AND CHEMOTHERAPEUTIC TREATMENT OF FORTNER'S AMELANOTIC HAMSTER MELANOMA AMEL 3HANEKE, E.; WOHLRAB, W.; PEKER, J.
doi: 10.1111/j.1365-2133.1972.tb05092.xpmid: 5043194
Summary.— Golden hamsters were injected subcutaneously with melanoma cells and treated with vincaleucoblastine (VLB) after growth of the tumour. The prolongation of survival time after surgical removal of the tumour was compared with that of a non‐operated, VLB‐treated control group. The survival time of the operated hamsters was significantly prolonged. Although they did not show signs of tumour recurrence, 3 operated animals died from the VLB treatment. Comparing the results of both chemotherapy and combined chemotherapeutic and surgical treatment with those of experiments without cytostatic therapy, the markedly unfavourable effect of VLB on hamsters with melanomata is apparent. We suppose the immunosuppressive side‐effect of VLB to be responsible for this negative result.
THE EFFECT OF GLYCEROL ON THE PERCUTANEOUS ABSORPTION OF METHYL NICOTINATEHADGRAFT, JONATHAN; HADGRAFT, J. W.; SARKANY, I.
doi: 10.1111/j.1365-2133.1972.tb05094.xpmid: 5043196
Summary.— The effect of glycerol on the rate of percutaneous absorption of methyl nicotinate from aqueous vehicles was investigated. The partition coefficients of methyl nicotinate between isopropyl myristate and aqueous solutions of glycerol were determined. The diffusivity of methyl nicotinate in various aqueous solutions of glycerol was also studied. It was shown that addition of glycerol in concentrations above 60% delayed the onset of erythema in human skin. The results suggest that this effect is related to the partition coefficient and diffusivity of methyl nicotinate in the aqueous vehicle. The osmotic effects of glycerol are negligible.
A BENIGN “MALIGNANT” ULCERNEWBOLD, P. C. H.; STOUGHTON, R. B.
doi: 10.1111/j.1365-2133.1972.tb05097.xpmid: 5043198
Summary.— A case is presented which is not amenable to exact diagnosis. In the presence of active auto‐immune thyroiditis, this lady developed a florid phagedaenic ulcer without obvious aetiology. No pathogen could be isolated and the lesion does not fit into any neoplastic or pseudo‐neoplastic category. Her excellent response to conservative treatment favours a non‐malignant background, but even long term follow‐up will not resolve all doubts, as she has received a course of radiotherapy.