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- W4229780655 abstract "LONDON Royal Society, Feb. 9.—W. S. STILES and B. H. CRAWFORD: The luminous efficiency of rays entering the eye pupil at different points. It is commonly assumed that the apparent brightness of an object is proportional to the pupil area. This assumption is shown to be invalid, and measurements are described which give the relative luminous efficiencies of rays entering the pupil at different points. From these data, the overall luminous efficiencies of eye pupils of different diameters are computed, and checked by direct measurement. The effect may originate in the eye media or in the retina itself.—R. J. LUDFORD: Differences in the growth of transplantable tumours in plasma and serum culture media. The malignant cells in tissue cultures of tumours can be distinguished from the non-malignant cells by the addition of trypan blue to the cultures, since the former do not segregate the dye like the latter. The two types of cells are further distinguishable by other characteristics. In plasma cultures, both malignant and non-malignant cells migrate from the explants. In serum cultures only non-malignant cells wander out from the explants. In serum cultures the explants of carcinomata soon become rounded and the explants of sarcomata tend quickly to disintegrate. The outgrowth of non-malignant cells in serum cultures is usually greatest when tumours are explanted at a time when they are not growing at their best in vivo. It is suggested that the different behaviour of malignant cells in plasma, and in serum, is the result of an alteration in their plasma membrane such that they are unable to adhere to glass, though able to use the fibrin network of a plasma clot as a support for their movement." @default.
- W4229780655 created "2022-05-11" @default.
- W4229780655 date "1933-02-01" @default.
- W4229780655 modified "2023-09-27" @default.
- W4229780655 title "Societies and Academies" @default.
- W4229780655 doi "https://doi.org/10.1038/131250a0" @default.
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