Sea urchin egg
Optical Changes in the Membranes of the Sea Urchin Egg at Fertilization, Mitosis and Cleavage
... Changes in birefringence and light scattering of the sea-urchin egg membranes at fertilization, mitosis and cleavage are described and illustrated.. There is a close similarity between t[r] ...
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Calcium in sea urchin egg during fertilization
... Int I De, lliul J~ 117 125(1490) 117 Calcium in sea urchin egg during fertilization ISABEllE GillOT'' PATRICK PAYAN', JEAN PIERRE GIRARD' and CHRISTIAN SARDET' 'Unite de Biologie Cellulaire Marine, UR[.] ...
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The Metabolism of the Sea Urchin Egg
... Phloridzin, which inhibits the acid production that occurs during the cytolysis of these eggs Rothschild, 1939, also inhibits lactic acid production in complemented extracts.* Lindberg &[r] ...
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A Quantitative Description of Protoplasmic Movement During Cleavage in the Sea Urchin Egg
... For the determination of cortical movement carbon particles were previously attached to the surface of the egg and the movement of the particles on the circumference of the largest optic[r] ...
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Tension at the Surface of Sea Urchin Egg: A Critical Examination of Cole's Experiment
... Contact area measured as area of no Brownian motion circles and measured photographically solid line plotted against relative radius r a ... Let us consider an egg compressed to the thic[r] ...
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The Fertilization Reaction in the Sea Urchin Egg The Effect of Nicotine
... CONCLUSION The incidence of polyspermy when nicotine-treated eggs are inseminated at different sperm densities shows that this treatment increases the chance of an effective spermegg col[r] ...
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The Metabolism of the Sea Urchin Egg
... The evidence for the operation of a tricarboxylic acid cycle in the eggs of Echinus esculentus is: a the inhibition of endogenous O2 uptake of homogenates by malonate; b the stimulation [r] ...
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The Cortical Changes on Fertilization of the Sea Urchin Egg
... Thus Moser 1939a has shown that following fertilization at the centrifugal pole, membrane elevation begins when the cortical reaction has reached half completion, although in uncentrifug[r] ...
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Tension at the Surface of the Dividing Sea Urchin Egg
... It should be stressed that although the egg continues to elongate to the stage of 50 % stalk width, the calculated tension reaches a maximum at the start of cleavage, when the first sign[r] ...
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The Fertilization Reaction in the Sea Urchin Egg
... In each case a series of theoretical curves is given, each corresponding to a different concentration of the diffusing substance reaching particular points on the cortex and causing the [r] ...
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The Fertilization Reaction in the Sea Urchin Egg
... The facts are not entirely incompatible with the view that this cortical response constitutes the barrier to polyspermy, if we accept the hypothesis that only a fraction of the collision[r] ...
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The Inorganic Constituents of the Sea Urchin Egg
... Sodium Potassium Calcium + Sr Magnesium Chloride Sulphate Total phosphorus.. The molalities of the commoner ions in sea water are also given in Table r.[r] ...
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The Effect of Fertilisation on the Permeability to Water and on Certain Other Properties of the Surface of the Egg of Psammechinus Miliaris
... The account just given of the different types of behaviour of the sea-urchin egg when placed in hypertonic solutions at various stages of development will make it clear that plasmolysis [r] ...
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The Lipids of Sea Urchin Semen
... The component fatty acids of the non-phospholipid fraction indicate that this portion of the total lipids conforms to the general character of marine oils by virtue of the low saturated [r] ...
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The sea urchin regulome in development
... developmental gene regulatory networks that underlie development of the body plan. The concept of a bilaterian “regulatory tool kit” is now firmly established (Davidson, 2006; Erwin and Davidson, 2002), and the evidence ...
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The Physiology of Sea Urchin Spermatozoa
... Two examples of the alleged physiological differences between dense and dilute sea-urchin sperm suspensions are: 1 Nelson 1948 stated that usnic acid stimulated the respiration of dense [r] ...
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The Movement of Sea Urchin Spermatozoa
... 5 A| the bending wave is symmetrical on the two sides of the tail; if the spermatozoon were imagined to slide forward within a closely fitting rigid tube the head would move along a symm[r] ...
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The Propulsion of Sea Urchin Spermatozoa
... Bearing in mind the above limitations it seems, nevertheless, remarkable that the forward speed of propulsion of a spermatozoon can be calculated well within the limits of experimental e[r] ...
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The Physiology of Sea Urchin Spermatozoa
... After sea-urchin semen has been washed with sea water to remove the seminal plasma, the O2 uptake of the resultant sperm suspension is markedly lower than that of the same number of sper[r] ...
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The Fertilization Reaction in the Sea Urchin
... When, as in these experiments, eggs are allowed to interact with spermatozoa for known times, and then functionally separated by immersion in hypotonic sea water, some eggs, presumably t[r] ...
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