(n.) The development, or mode of origin, of the ova.
Example Sentences:
(1) During oogenesis in many animals there is a massive extrachromosomal synthesis of the genes for ribosomal RNA.
(2) The distribution of these molecules has been studied during oogenesis and during early post-fertilization development.
(3) By applying a number of quantitative nucleic acid hybridization procedures to both total and fractionated oocyte and somatic DNA, employing both homologous and heterologous U snRNA gene probes and suitable amplification and non-amplification control probes, we show that the U snRNA genes do not undergo any major amplification in Xenopus oogenesis.
(4) We assume that the relative content of 5S rRNA fractions reflects the proportion between ribosomes synthesized during oogenesis and those synthesized in embryos and larvae.
(5) The temperature-sensitive Drosophila developmental mutation, l(3)c21RRW630 (abbreviated RW630) disturbs oogenesis and has a maternal effect on embryogenesis.
(6) As the oocyte grows the amount of DNA in it increases rapidly, but at the end of oogenesis the increase in the amount of DNA lags considerably behind the rate of increase in the volume of the oocyte.
(7) The shorter cyclin B transcript alone is then detectable in the presumptive oocyte until stages 7-8 of oogenesis.
(8) Our results indicate that no significant differences exist in the rate of protein synthesis among any of the stages of oogenesis investigated.
(9) 6) Significant, lower frequencies of structural chromosome anomalies were observed irradiating earlier stages of mouse oogenesis.
(10) Eight stages in the oogenesis of Dermogenys pusillus were selected in order to demonstrate the formation of the egg membrane.
(11) The tudor (tud) locus of Drosophila melanogaster is required during oogenesis for the formation of primordial germ cells and for normal abdominal segmentation.
(12) The stages of embryogenesis of Polypodium closely correspond to stages of the host oogenesis.
(13) It is shown that E2-17 beta MCR changes significantly during the progress of oogenesis, mainly at the end of the sexual cycle.
(14) This treatment resulted in developmental retardation which was manifested in a number of ways: at the age of 30 days, the weight of the body was well as spleen, testes and particularly thymus was significantly reduced; histologically, the normal proportion of the red and white pulp in the spleen was changes; spermatogenesis (but not oogenesis) was markedly retarded corresponding to the age of 12-15 days in normal males; also skin displayed a persisting immaturity as reflected by an abundance of mast cells.
(15) Adult females homozygous for temperature-sensitive alleles exposed to the restrictive temperature during oogenesis produce embryos that show anterior segments with structures normally unique to the eighth abdominal segment, another transformation characteristic of polycomb-group mutants.
(16) This effect may have been related to differences in the environmental factors to whcih the two groups were exposed during oogenesis.
(17) They also suggest that the O-acetylated Neu5Gc and 9-O-Ac-KDN residues may have an important role during oogenesis.
(18) The microtubule array becomes progressively more complex and polarized during oogenesis; an extensive array of microtubules and microtubule bundles was apparent in the animal hemisphere of stage VI oocytes, and a less ordered array was observed in the vegetal hemisphere.
(19) The molecular and cytoplasmic organization of both axes originates during oogenesis and leads to the production of an ooplasmic system which consists of euplasm and deutoplasm (yolk) and contains a nucleus as well as extranuclear determinants of maternal origin.
(20) Serendipity delta (sry delta) is a member of a set of Drosophila zinc finger protein genes showing maximal transcription during oogenesis.
Ovum
Definition:
(n.) A more or less spherical and transparent mass of granular protoplasm, which by a process of multiplication and growth develops into a mass of cells, constituting a new individual like the parent; an egg, spore, germ, or germ cell. See Illust. of Mycropyle.
(n.) One of the series of egg-shaped ornaments into which the ovolo is often carved.
Example Sentences:
(1) A specimen of a very early ovum, 4 to 6 days old, shown in the luminal form of imbedding before any hemorrhage has taken place, confirms that the luminal form of imbedding does occur.
(2) The results indicate that the sperm swelling test and the zona-free hamster ovum penetration assay are evaluating different functional qualities of sperm that are apparently not associated with each other.
(3) This study documents a molecular change in the murine ovum related to its exposure to oviductal fluid.
(4) The OCI-related membrane appeared a cause of OCI interference with fimbrial ovum capture by preventing the contact between the fimbrial cilia and the cumulus oophorus.
(5) Also, for determination of the fertilizing capacity of the semen, a zona-free hamster ovum penetration test was done in 49 men, while 14 men were studied by determination of the fertilization of human oocytes in vitro.
(6) The antiprogesterone RU 486 was utilized to evaluate the possible role of progesterone in ovum maturation, ovulation, fertilization, and embryo cleavage.
(7) It is suggested that the beta inhibitory activity of the uterus and the alpha excitatory activity of the rest of the oviduct are involved in the regulation of ovum transport.
(8) Among antigens possible unique to the reproductive process, sperm antigens, antigens of seminal plasma and of the ovum, antigens of placental hormones and of placenta specific proteins appear suitable targets of the production of fertility regulating vaccines.
(9) The preovulatory surge of gonadotropins activates a cascade of proteolytic enzymes resulting in the rupture of the follicular wall and the release of a fertilizable ovum during ovulation.
(10) The development of vaginal ultrasound transducers has facilitated ovum pick-up (OPU) by providing higher precision and less trauma than are found with laparoscopy and other ultrasound-assisted techniques.
(11) In Johnson v. Calvert, a surrogate mother in California failed to gain custody of the child she bore after gestating an embryo from the ovum and sperm of the couple who hired her.
(12) Risk factors that may theoretically alter ovum quality or the hormonal environment include ovulation induction, fertilization in vitro, delayed ovulation, and transperitoneal ovum migration.
(13) Thus, spermatozoa deposited in the vicinity of the USHG immediately following oviposition (to simulate a release of spermatozoa from this region) can be transported to the infundibulum and effectively fertilize the next ovum ovulated.
(14) However, they do not as yet permit a judgment as to the degree that ovum pickup through a fistula was impaired.
(15) We evaluated the differences between this group and those patients presenting either with a blighted ovum or beyond the first trimester, as well as the outcome of those patients with spotting early in gestation.
(16) It is too soon to learn whether this method will be reversible, but use of silastic should prevent adhesions while providing another mechanical barrier between ovum and sperm.
(17) Indomethacin was effective in preventing follicular rupture and ovum extrusion when administered simultaneously with gonadotropin.
(18) A 33% clinical pregnancy rate per ovum pick-up was achieved with the Buserelin-hMG treatment.
(19) The pregnancy rates were higher than a matched IVF series in the male factor and female ASAB groups and reached statistical significance for the ovum donation group.
(20) Lamellar structures, therefore, are considered to be storage material chiefly used in the second half of the cleavage for developmental processes in the rat ovum.