Electropotential differences between the cytoplasm and external medium have been compared in the mature R. pipiens occyte and the ovulated unfertilized egg as a function of [Na],, [K],, [Ca], and [Cl],. In solutions containing 1.0 mM Ca++ the oocyte behaved as though it were predominantly permeable
Permeability changes in fertilized and activated amphibian eggs
✍ Scribed by Løvtrup, Søren
- Book ID
- 102890327
- Publisher
- John Wiley and Sons
- Year
- 1962
- Tongue
- English
- Weight
- 559 KB
- Volume
- 151
- Category
- Article
- ISSN
- 0022-104X
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📜 SIMILAR VOLUMES
Electropotential differences between the cell interior and the external medium have been studied with intracellular microelectrodes in ovarian oocytes, ovulated unfertilized eggs and fertilized eggs of R. pipiens. In ovarian oocytes the cytoplasm was 50 to 80 mV negative, relative to isotonic Ringer
hsdell ( '46). Halleiitine ( '40a). \* Ballcntine ( '40b j. Rrittori ( '38). ' Daniels ( '41). ' Gilchrist 'anti' Pinciix ( '32). ' Lillie ( '1 1). " Nicliol ( '3.5 j . '' Novikoff ( '39). Pons ( ' 2 7 ) . Tylrr ( '31 ) . 1.3 q.ler ('3a / ) . l4 Whitaker ( ' 3 3 ) .
Values of k may easily be computed froin the volume-time curve by drawing a tangent to the curve at any desired instant; the details of this method are given elsewhere(5). But for purposes of greater accuracy the integrated equation has been used in the present paper.