(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.
Vitellus
Definition:
(n.) The contents or substance of the ovum; egg yolk. See Illust. of Ovum.
(n.) Perisperm in an early condition.
Example Sentences:
(1) However, fusion of Syrian hamster spermatozoa with the vitellus of zona-intact Chinese hamster eggs was never observed.
(2) A shorter period of vitellus resorption (50 vs 65 day) was observed in (n-3)-deficient alevins as compared to controls.
(3) Evidence of sperm penetration (presence of one or more sperm in perivitelline space or inside the vitellus) was found beginning 1.75 hours after the end of the mating period.
(4) However, the penetrability of the vitellus increased significantly with advancing stages of meiotic maturity.
(5) Ova from copper IUD users were distinctive for being without vitellus and surrounded by macrophages.
(6) Decondensing sperm nuclei were found in the vitellus of 27% of the oocytes which had not been cultured and in the vitellus of 20% of those which had been cultured for 24--72 hours and were in various stages of maturation.
(7) These results indicate that maturation of bovine oocytes is not required for sperm penetration into the vitellus or for sperm nuclear decondensation under the in-vitro conditions used.
(8) 3 hours after transfer, they were recovered and examined for penetration of the vitellus and for the number of spermatozoa present in the perivitellum space or zona pellucida.
(9) When 5 eggs were examined 15 min after insemination, no signs of sperm penetration into the vitellus were observed.
(10) About 7 to 9 follicles in each ovariole are loaded progressively with vitellus and secrete a chorion.
(11) Significant residues of DDT have been found in the albumin and vitellus of Quail eggs, after external treatment of the shell with an aqueous suspension of commercial DDT.
(12) Finally, the morphological characteristics of the cumulus oophorus-corona radiate-zona pellucida-vitellus complexes are analyzed, as well as the biochemical and hormonal composition aspiration, in order to assess the quality of the recovered oocytes, their probabilities to be fertilized and their potential to develop into subsequent stages which culminate with the birth of full term, viable and healthy babies.
(13) A complex but permeable network of intercellular spaces provides a path for possible transfollicular penetration for the exogenous fraction of the vitellus.
(14) Using the double immunodiffusion procedure it was shown that the anti-vitellogenin serum recognized identical antigenic determinants in plasma from a vitellogenic female or from estrogenized lizards, and in crude vitellus.
(15) The volumes of the entire egg, intrazonal cavity, zona pellucida perivitteline space, and the vitellus were measured during the initial 18 hours of development following ovulation and fertilization.
(16) Administered into the vitellus or on the shell, before incubation, the pesticide exerts the same reduction of the Quail germ population.
(17) By light microscopy, many spermatozoa (greater than 100 per oocyte) were seen to be bound to the oolemma, and a small proportion (1-2 spermatozoa) were judged to have undergone fusion and penetration of the vitellus, as indicated by complete decondensation of their chromatin.
(18) By scoring binding at one minute intervals it was possible to relate the rapid uninterrupted binding that occurs between capacitated spermatozoa and isolated zonae pellucidae with the equally rapid but transient and vitellus-influenced binding that occurs between gametes.
(19) Size of follicles and presence of vitellus (lipoprotein) in the oocytes of several animals indicate that ovarian development was more advanced in our females than in other studies.
(20) Three hours later the eggs were recovered and the experimental and control groups were compared for penetration of the vitellus and for numbers of spermatozoa within the perivitelline space or in the zona pellucida.