Flexner's Na+ clearances and the histological structure and age of the placenta in various species.


1939 and the early 1940s saw the publication of a remarkable series of papers on placental transfer. For the first time, a group of investigators made a quantitative and systematic study of the transfer of a simple, presumably inert physiological solute, the sodium ion, in a number of different species at various gestational ages. The driving force behind… (More)


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