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germ
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germ plasm
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Extragonadal Germ Cell Tumors
Extragonadal germ cell tumors Definition Germ cells are primitive cells within the body that normally mature into ova (egg) or sperm cells. More than 90% of all germ cell tumorsare gonadal; that is, they develop in the ovaries or the testes (the gonads). The remaining 5-10%... Read more |
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germ layers
germ layers (primary germ layers) The layers of cells in an animal embryo at the gastrula stage, from which are derived the various organs of the animal's body. There are two or three germ layers: an outer layer (see ectoderm), an inner layer (see endoderm), and in most animal groups a middle layer... Read more |
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Wheat germ
Wheat germ Description Wheat germ is the embryo of the wheat kernel. It is separated from wheat being milled for flour. Wheat germ is sodium and cholesterol free, and dense in nutrients. It is rich in vitamin E, magnesium, pantothenic acid, phosphorus , thiamine, and zinc . It is also a... Read more |
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germinal selection
germinal selection 1. The selection (by people) of germ cells (sex cells from which gametes are derived) that possess qualities recognized as superior for use in the production of a subsequent generation. This method is used in the breeding of domesticated animals; and it is proposed by those... Read more |
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August Weismann
August Weismann , 1834-1914, German biologist. He taught zoology at the Univ. of Freiburg from 1866 to 1912. He is known as the originator of the germ-plasm theory of heredity . His doctrine, formerly called Weismannism, stresses the unbroken continuity of the germ plasm and the nonheritability of... Read more |
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Milton Berle
Milton Berle 1908-2002, American entertainer, b. New York City as Milton Berlinger. Berle first performed in vaudeville and on (1939-48) radio. His great success, however, came as television's first real star, and his broadly appealing comedy routines contributed significantly to the young medium's... Read more |
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Gastrulation
gastrulation In the embryogenesis of a vertebrate, the next stage after the blastula, in which the three germ layers differentiate to form the triploblastic embryo and the basic body plan of the vertebrate is laid down. During this stage there is a complicated movement of cells from various... Read more |
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Spermatogenesis
spermatogenesis The series of cell divisions in the testis that results in the production of spermatozoa. Within the seminiferous tubules of the testis germ cells grow and divide by mitosis to produce spermatogonia. These divide by mitosis to produce spermatocytes, which divide by meiosis to produce... Read more |
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