By C. R. Austin (auth.), A. Gropp, K. Benirschke (eds.)
The early improvement of the mammalian embryo belongs to a interval which, for the scholar, presents the relatively deep fascination attached with the procedures of germination of the 1st soft buds of existence. furthermore, developmental biology features a very huge a part of biology; if largely dermed - just about all of it. an identical is right for the sphere of pathology if the manifold chances of problems of the orderly prepared pathways of developmental strategies are thought of. basic improvement in its earliest steps - and it'd be diffI cult to work out it differently - skill the functioning of very complex platforms of complicated inter established cycles managed by way of structural, genetic, physiological and biochemical determi nants. even if, disturbances interfering with them of their very other ways, may end up in fetal dying, problems of progress and differentiation, malformation and illness, occasionally as overdue as within the subsequent iteration or later. this can be, certainly, the fear of the pathologist to whom and to whose curiosity in developmental pathology, this e-book is devoted. The outlines of the current quantity have been conceived at a symposium on "Control of early em bryogenesis and elements answerable for failure of embryonic improvement" held might 1-4, 1974 in Travemtinde and subsidized by means of the Deutsche Forschungsgemeinschaft. virtually fIfty lively members attended this convention. on the time and according to the aim of the convention, book of the court cases was once no longer envisaged.
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4. The Proteins in the Mammalian Egg 5. Inactive Enzyme Molecules and their Activation 32 33 34 III. Final Remarks References . . . . . . . . . . . . . . . . . . . . . . . " 36 39 41 42 I. Xenopus and Sea Urchin - An Introductory Side-glance As early as 1896, Wilson stated that embryogenesis commences during oogenesis. , 1973a). , 1964). , 1951; Smith and Ecker, 1965). Parthenogenetically activated eggs (Terman and Gross, 1966) or enucleate egg halves (Denny and Tyler, 1964) will go through early development and follow the same pattern of amino acid incorporation into protein as fertilized eggs (Terman and Gross, 1966; Fry and Gross, 1970).
Baker, T. : The uptake of tritiated uridine and phenylalanine by the ovaries of rats and monkeys. J. Cell Sci. 4, 655-675 (1969). K-::-The effect of inhibition of desoxyribonucleic acid synthesis on histone phosphorylation. b 5146-5150 (1973). : Parthenogenesis and heteroploidy in the mammalian egg. In: Oogenesis. Baltimore: University Park Press 1972. A. synthetic activity of human oocyte. Lancet 1968 II, 1039. : Regulation of genetic expression. In: The Biochemistry of Development. B. Lippincott Co.
We investigated the LDH isozyme pattern by rnicrodisc electrophoresis in full-grown oocytes of 16 mammalian species belonging to fhe different taxonomic orders. The results obtained point to the existence of two types of oocytes in mammals: while in the order Rodentia only LDHI is demonstrable, LDH isozymes formed of Q- and ~-subunits are present in the oocytes of species of the orders Lagomorpha, Carnivora, Artiodactyla, and in man. , 1975). The significance of the high LDH activity in the mouse eggs is unclear, particularly since mouse zygotes are known to be unable to convert lactate to pyruvate.