2 edition of Artificial membrane-formation and chemical fertilization in a starfish (Asterina) found in the catalog.
Artificial membrane-formation and chemical fertilization in a starfish (Asterina)
|Statement||by Jacques Loeb.|
|Series||University of California publications. Physiology,, v. 2, no. 16|
|LC Classifications||QH485 .L7|
|The Physical Object|
|Number of Pages||158|
|LC Control Number||a 11001264|
The chemical investigation was carried out during the spring quarter in the Laboratory for Plant Biology of the Carnegie Institution of Washington, Stanford chemical analyses carried out in collaboration with Dr. J. H. C. Smith and Mr. H. Milner have shown definitely that the purple pigment of these bacteria is a new member of. And it is this "branch" of chemistry to which the present Section is devoted, following the corresponding (German) text in Oskar Müller's book on Unimol. The fact that life and chemistry, and thus biological phenomena and chemical processes, are closely connected with each other has become such a self-evident case, that one often has taken the.
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Models for the Biosynthesis of an Acetylenic Bond. During the early s, two models put forward for the biosynthesis of polyacetylenes, the oxidative dehydrogenation (desaturation) mechanism and a decarboxylative enol elimination mechanism, used divergent approaches to the formation of the second π-bond (Fig. 2).The desaturation model, supported by the landmark . Fertilization Cleavage Amphioxus Fishes Amphibians Reptiles and Birds Mammals Overview of Cleavage Gastrulation and Neurulation Amphioxus Fishes Amphibians Birds and Reptiles Mammals Website for Vertebrates: Comparative Anatomy, Function, Evolution, Sixth Edition A website for this.
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Additional Physical Format: Online version: Loeb, Jacques, Artificial membrane-formation and chemical fertilization in a starfish (Asterina). Artificial Parthenogenesis and Fertilization is a revised and English-translated work from his earlier book, Die chemische Entwicklungserregung des tierischen Eies ().
Artificial Parthenogenesis describes Loeb’s many and varied methodical experiments to initiate egg development without fertilization by sperm. Read the full-text online edition of Artificial Parthenogenesis and Fertilization ().
In the author published a book entitled Die chemische Entwicklungserregung des tierischen Eies (Springer, Berlin), in which he gave an account of his experiments on artificial parthenogenesis.
The Effect of Artificial Membrane Formation on the. Artificial Parthenogenesis and Fertilization is a revised and English-translated work from his earlier book, Die chemische Entwicklungserregung des tierischen Eies ().
Artificial Parthenogenesis describes Loeb’s many and varied methodical experiments to initiate egg development without fertilization by sperm. As is true with much of. Full text of "Artificial Parthenogenesis And Fertilization." See other formats.
Artificial Parthenogenesis and Fertilization is a revised and English-translated work from his earlier book, Die chemische Artificial membrane-formation and chemical fertilization in a starfish book des tierischen Eies ().
Artificial Parthenogenesis describes Loeb's many and varied methodical experiments to initiate egg development without fertilization by sperm. Artificial membrane-formation and chemical fertilization in a starfish (Asterina) / by Jacques Loeb Loeb, Jacques, [ Government publication, Book: ].
1 Part II - The Period of Fertilization; 2 Fertilization. Definition of Fertilization; B. Historical Considerations Concerning Gametic Fusion and Its Significance; C. Types of Egg Activation.
Natural Activation of the Egg; 2. Artificial Activation of the Egg; D. Behavior of the Gametes During the Fertilization Process. General Condition of the. Loeb believed that membrane formation sets going certain chemical reactions upon which the future development of the egg depends.
These chemical reactions, however, leave the egg in a condition from which it will not itself recover, and unless a second factor is employed in the process it will disintegrate rapidly. In fertilization, the haploid nuclei of the gametes are brought together.
A more or less intimate fusion of the gamete nuclei takes place (karyogamy). In this way, the diploid synkaryon is formed. This process is the essential basis for biparental inheritance. The gametes can be of equal size and shape; fertilization is then isogamous. Relation of Activation to Fertilization A.
ARTIFICIAL PARTHENOGENESIS From the time of the discovery of artificial parthenogenesis at the turn of the century many investigators have hoped to find, by investigation of physical and chemical activating agents of various sorts, the particular agent that the sperm employs to induce activation of Cited by: This dissolved jelly may be in time decomposed by bacteria and thus prevent membrane formation.
If eggs with jelly remain in sea water fifty-two hours, they do not form membranes on fertilization. When a sea urchin's egg is fertilized, an increase in the rate of respiration occurs, as shown by O. Warburg. T HE reader is aware that two conflicting conceptions are held in regard to the nature of life, namely, a vitalistic and a mechanistic.
The vitalists deny the possibility of a complete explanation of life in terms of physics and chemistry. The mechanists proceed as though a complete and unequivocal physico-chemical analysis of life were the attainable goal of biology.
Abstract. Fertilization represents the extremes in cytoskeletal organization and the complexity of motile systems. On one hand, the cytoskeleton of the sperm is reduced to that of two polarized fibers: the 9+2 microtubules of the axoneme emanating from the base of the centrioles and, following the acrosome reaction, the microfilaments of the acrosomal process extending in the Cited by: The blindness of the cave fauna and the artificial production of blind fish embryos by heterogeneous hybridization and by low temperatures: The chemical character of the process of fertilization and its bearing upon the theory of life phenomena: Chemische Entwicklungserregung des tierischen Eies.
Electrical properties of Echinoderm eggs. of the starfish egg before and after fertilization. Biol. surface impedance which can be related either to membrane formation or to cell division.
Releases jelly, and vitelline m and accessory cells of starfish. 5 min to remove jelly and VM. pH very important. higher pH () requires 1/2 the time. BM Shapiro.
Awakening of the invertebrate egg at fertilization. In Fertilization and embryonic development in vitro. Eds. L Mastroianni, Jr. and JD Biggers. Plenum Press, NY.
pp Major site of chemical digestion and absorption, contains three sections -duodenum - most digestion-jejunum & illiim - absorption of nutrients Chemical Digestion-digestive enzymes -secreted by accessory glands - pancreas, liver, gall bladder - buffers also found -reduce acidity of material from stomach-alkalai solution rich in bicarbonate (HCO3-).
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Plant genetic resources for food and agriculture play essential roles in sustainable development and the conservation of global biodiversity. Especially, water cycle and related material circulation are deeply influenced by the loss of plant species diversity and external inputs through agricultural practices.
This chapter overviews the water and ecosystem cycles mediated by the ecosystem Author: Masatoshi Funabashi. Nuclear pore complexes (NPCs) are large proteinaceous channels embedded in double nuclear membranes, which carry out nucleocytoplasmic exchange.
The mechanism of nuclear pore assembly involves a unique challenge, as it requires creation of a long-lived membrane-lined channel connecting the inner and outer nuclear membranes.PREFACE At the suggestion of the Cambridge Philosophical Society, the Syndics of the University Press decided in March,to arrange for the publication of a series of Essays in commemoration of the Centenary of the birth of Charles Darwin and of the Fiftieth anniversary of the publication of "The Origin of Species".Molteno Institute and Department oj Veterinary and Clinical Studies, University oj Cambridge, Cambridge, England Expanding world-wide interest in reproduction finds its expression in sustained scientific activity in this field which is attracting increasing numbers of investigators, many hundreds of whom have gathered at international meetings held insuch as the .