| fertilization membrane | A viscous membrane formed on the inner surface of the vitelline membrane from the cytoplasm of the egg cell after entry of the sperm, preventing the entry of additional sperm. (05 Mar 2000) |
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| self-fertilization | <botany> The fertilization of a flower by pollen from the same flower and without outer aid; autogamy. Source: Websters Dictionary (01 Mar 1998) |
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| in vitro fertilization | <gynaecology> Fertilization outside the body in a laboratory, the term test tube baby is inaccurate since fertilization occurs in a small circular dish, not a test tube. (27 Oct 1998) |
| in vivo fertilization | Fertilization of a ripe egg within the distal fallopian tube of a fertile donor female (rather than in an artificial medium), for subsequent nonsurgical transfer to an infertile recipient. (05 Mar 2000) |
| fertilization | 1. <cell biology> The essential process in sexual reproduction, involving the union of two specialised haploid cells, the male and female gametes to give a diploid cell, the zygote, which then develops to form a new organism. 2. <biology> The act of fecundating or impregnating animal or vegetable germs; especially, the process by which in flowers the pollen renders the ovule fertile, or an analogous process in flowerless plants; fecundation; impregnation. 3. <botany> Close fertilization, the fertilization of pistils by pollen derived from the stamens of the same blossom. Cross fertilization, fertilization by pollen from some other blossom. See Cross. (28 Oct 1998) |
| fertilization in vitro | Fertilization of an egg outside the body when the egg is normally fertilised in the body. (12 Dec 1998) |
| adamantine membrane | The primary enamel cuticle, consisting of two extremely thin layers (the inner one clear and structureless, the outer one cellular), covering the entire crown of newly erupted teeth and subsequently abraded by mastication; it is evident microscopically as an amorphous material between the attachment epithelium and the tooth. Synonym: cuticula dentis, adamantine membrane, dental cuticle, membrana adamantina, Nasmyth's cuticle, Nasmyth's membrane, skin of teeth. (05 Mar 2000) |
| allantoid membrane | An embryonic diverticulum of the hindgut of reptiles, birds, and mammals; in man its blood vessels give rise to those of the umbilical cord. (12 Dec 1998) |
| alveolocapillary membrane | The pulmonary diffusion barrier. (05 Mar 2000) |
| alveolodental membrane | <anatomy> Fibrous connective tissue surrounding the root of a tooth that separates it from and attaches it to the alveolar bone. (12 Dec 1998) |
| anal membrane | The dorsal portion of the embryonic cloacal membrane after its division by the urorectal septum. Anterior atlanto-occipital membrane, the fibrous layer that extends from the anterior arch of the atlas to the anterior margin of the foramen magnum. Synonym: membrana atlanto-occipitalis anterior. (05 Mar 2000) |
| anisotropic membrane | This type of synthetic membrane has an asymmetric pore structure: a thinfilm with tight pores backed by a thicker film with wider pores. Thistype of membrane is used for ultrafiltration andreverse osmosis, the porous side faces the feed stream and the tight-pored side faces the product stream. (09 Oct 1997) |
| anterior recess of tympanic membrane | A slitlike space on the tympanic wall between the anterior malleolar fold and the tympanic membrane. Synonym: recessus membranae tympani anterior, Troltsch's pockets, Troltsch's recesses. (05 Mar 2000) |
| anti-basement membrane antibody | Autoantibodies to renal glomerular basement membrane antigens. (05 Mar 2000) |
| anti-basement membrane glomerulonephritis | Glomerulonephritis resulting from anti-basement membrane antibodies, characterised by smooth linear deposits of IgG and C3 along glomerular capillary walls; includes rapidly progressive glomerulonephritis and glomerulonephritis in Goodpasture's syndrome. (05 Mar 2000) |
| anti-basement membrane nephritis | Glomerulonephritis produced by autologous or heterologous antibodies to the glomerular capillary basement membranes, the latter known as anti-kidney serum nephritis. (05 Mar 2000) |