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IS LIVING PROTOPLASM PERMEABLE TO IONS?

Osterhout, W. J. V.
Fonte: The Rockefeller University Press Publicador: The Rockefeller University Press
Tipo: Artigo de Revista Científica
Publicado em 18/09/1925 Português
Relevância na Pesquisa
148.29727%
On page 138, Vol. viii, No. 2, September 18, 1925, in line 4 from bottom, in place of (50) (5.4) = 2.7 read See PDF for Equation. In the next line, in place of 52.7 read 52.9. On page 139, in line 3 from top, in place of 5.4 read See PDF for Equation. In line 11 from top, in place of (97.2 x 5.4) = 102.5 read See PDF for Equation. In line 13, in place of 100 + 5.4 = 105.4 read See PDF for Equation.

HETEROGENIC SERUM, AGE, AND MULTIPLICATION OF FIBROBLASTS

Carrel, Alexis; Ebeling, Albert H.
Fonte: The Rockefeller University Press Publicador: The Rockefeller University Press
Tipo: Artigo de Revista Científica
Publicado em 01/01/1922 Português
Relevância na Pesquisa
148.29727%
The presence in a culture medium of heterogenic serum of various concentrations exerts a definite influence on the rate of multiplication of fibroblasts. Dog serum does not inhibit the growth of See PDF for Structure chicken fibroblasts markedly until its concentration reaches 15 per cent. Beyond this figure, each increase of the concentration brings about a rapid decrease in the rate of cell multiplication. When the concentration reaches from 30 to 45 per cent, no growth takes place. The inhibiting action of cat serum begins to manifest itself at a concentration of 25 per cent and prevents cell proliferation completely at a concentration of 55 and 60 per cent. The ratio, See PDF for Equation can be taken as expressing the action of the serum on fibroblast multiplication; that is, as the growth index of the serum. See PDF for Structure The inhibiting influence of heterogenic serum was found to vary in direct ratio to the age of the animal from which it was obtained. The rate of proliferation of chicken fibroblasts was studied comparatively in media containing varied concentrations of serum from young and old animals. For each concentration of serum, the rate of growth in the serum of the old animal was expressed in relation to the rate of growth in the serum of the young animal. When cat serum was used...