منابع مشابه
The Membrane Capacitance of the Sea Urchin Egg
1. The surface of the unfertilized sea urchin egg is folded and the folds are reversibly eliminated by exposing the egg to hypotonic sea water. If the plasma membrane is outside the layer of cortical granules, unfolding may explain why the membrane capacitance per unit area decreases (and does not increase) when a sea urchin egg is put into hypotonic sea water. 2. The degree of surface folding ...
متن کاملCalcium in sea urchin egg during fertilization.
Calcium plays a strikingly important role in two of the major events in developmental biology: cell activation and differentiation. In this review we begin with the location and quantity of intracellular calcium in sea urchin oocytes, and then discuss the changes that occur during fertilization and egg activation, placing special emphasis on the mobilization and redistribution of intracellular ...
متن کاملMembrane fusion of secretory vesicles of the sea urchin egg in the absence of NSF.
The role of cytosolic ATPases such as N-ethylmaleimide (NEM)-sensitive fusion protein (NSF) in membrane fusion is controversial. We examined the physiology and biochemistry of ATP and NSF in the cortical system of the echinoderm egg to determine if NSF is an essential factor in membrane fusion during Ca(2+)-triggered exocytosis. Neither exocytosis in vitro, nor homotypic cortical vesicle (CV) f...
متن کاملIsolation and partial characterization of the plasma membrane of the sea urchin egg
The cell surface complex (Detering et al., 1977, J. Cell Biol. 75, 899-914) of the sea urchin egg consists of two subcellular organelles: the plasma membrane, containing associated peripheral proteins and the vitelline layer, and the cortical vesicles. We have now developed a method of isolating the plasma membrane from this complex and have undertaken its biochemical characterization. Enzymati...
متن کاملDemonstration of Polyribosomes after Fertilization of the Sea Urchin Egg.
Fertilization of sea urchin eggs initiates an increased amino acid incorporation into proteins.1' 2 This stimulation of protein synthesis has been attributed to activation of ribosomes.3 Nemer4' I and Wilt and Hultin' found that the synthetic messenger RNA polyuridylic acid stimulates homogenates from unfertilized eggs to synthesize polyphenylalanine. After fertilization, messenger RNA may comb...
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ژورنال
عنوان ژورنال: Proceedings of the Imperial Academy
سال: 1940
ISSN: 0369-9846,1881-1140
DOI: 10.2183/pjab1912.16.149