Maternal energy investment in eggs and jelly coats surrounding eggs of the echinoid Arbacia punctulata
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چکیده
منابع مشابه
The Nucleic Acid of the Eggs of Arbacia Punctulata
Quantitative determinations of the phosphorus distribution in the eggs of a variety of species by Tschernorutzki (l), Massing (2), and Needham and Needham (3) have indicated the probable presence of nucleoproteins in unfertilized ova. Unfortunately, however, the presence of vitellins in such cells renders the exact interpretation of such analyses somewhat difficult since, with current methods o...
متن کاملThe Osmotic Properties of Living Cells (eggs of Arbacia Punctulata)
WE HAVE ATTEMPTED TO ANSWER THE QUESTION: How nearly ideal, as an osmometer, is the unfertilized Arbacia egg? The following conclusion have been reached: 1. Volumes can be measured accurately over a wide range of pressures since the cell is in general spherical and does not suffer deformation from its own weight or other factors. 2. The product of volume and pressure is approximately constant, ...
متن کاملHexokinase Activity from Eggs of the Sea Urchin Arbacia Punctulata
1. The hexokinase activity of homogenates of eggs and embryos of the sea urchin Arbacia punctulata has been measured. Expressed as micrograms glucose consumed at 20 degrees C., per hour per milligram of protein the following values were obtained: unfertilized eggs, 67; fertilized eggs, 72; 24 hour plutei, 94; 48 hour plutei, 226. The concentration of the enzyme in the eggs is small and may be c...
متن کاملIncreased Permeability to Water of Aging Unfertilized Eggs (arbacia Punctulata)
1. Unfertilized Arbacia eggs, subjected to 50, 60, or 80 per cent sea water, at the same temperature, pH, and duration, swelled progressively faster with age. Swelling increased 12.2 to 39.6 per cent. 2. Permeability to water was calculated by the method of Lucké and McCutcheon. For freshly shed eggs from nine different females, permeability varied from 0.078 to 0.124, or 59 per cent. This vari...
متن کاملFertilization and the Temperature Coefficients of Oxygen Consumption in Eggs of Arbacia Punctulata
The eggs of A. punctulata have a high temperature coefficient in the resting state: Q(10) = 4.1. On fertilization and on cytolysis the temperature coefficient falls to less than half the resting value: Q(10) = 1.8 and 1.9 respectively. The factor by which oxygen consumption increases on fertilization is a variable, its magnitude depending on temperature as well as on egg species. It is nearly t...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 2000
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1542700