(n.) One of the segments first formed by the division of the ovum.
Example Sentences:
(1) Mouse embryos at the two-cell stage were separated into two individual blastomeres, and one blastomere was karyotyped at the second cleavage.
(2) Cleaved embryos with 'ideal' blastomere numbers (2, 4 or 8) showed a considerably higher metaphase frequency than others.
(3) Among the most conspicuous features found were the presence of very distinct desmosome-like structures between blastomeres, and the cytoplasmic cell organelles distribution in three areas referred as: a sub-cortical, a middle and a perinuclear bands.
(4) The procedure involves bisection of single-cell eggs in a medium containing cytochalasin; fusion of egg halves with single blastomeres, induced using Sendai virus or an electrofusion apparatus; and embedding in agar, followed by culture of the reconstituted embryos in the ligated oviducts of ewes in dioestrus.
(5) Lineage tracing techniques demonstrated that those cells in the ICM of early blastocysts which did possess filaments were almost exclusively the progeny of polar 16-cell blastomeres, suggesting that these filaments were directly inherited from outside cells at the 16- to 32-cell transition.
(6) Although the posterior-vegetal blastomeres (B4.1 pair) of the 8-cell embryo have long been believed to be the sole precursors of larval muscle, recent studies using horseradish peroxidase to mark cell lineages have shown that small numbers of muscle cells originate from the anterior-vegetal (A4.1) and posterior-animal (b4.2) blastomeres of this stage.
(7) Day 6 embryos were bisected and the resulting demiembryos were stained with Hoechst 33342 and cell counts were made by counting intact blastomere nuclei.
(8) Embryos developed at a normal rate after destruction of some blastomeres.
(9) The precise temporal and spatial coincidence of the patterns of polarization and the division cycles further suggests that a mechanistic link is maintained among cell division, blastomere polarization, and probably also a heritable component of the animal-vegetal axis.
(10) Each blastomere populated all three primary germ layers.
(11) The effect of destruction of some blastomeres on subsequent cleavage in vitro was investigated in the marsupial Antechinus stuartii.
(12) We conclude that, in general, analysing blastomeres is subject to less mis-diagnosis than polar body analysis, except in the case of dominant diseases which are caused by genes which lie extremely close to the centromere.
(13) The dexiotropic rotations of blastomeres were also observed during the division of the trypsinized zygotes with the tripolar mitotic apparatus.
(14) Primordial germ cells (PGCs), which formed in 78% of cases when the presumptive ventral half to the embryo was cultured, occurred in only 48% of cases when the two ventral vegetal blastomeres were cultured alone.
(15) Nematodes have been considered the chief paradigm for determinate and cell-autonomous development, but recent experiments on the early development of Caenorhabditis elegans suggest that most blastomeres of this nematode are, in fact, determined by interactions.
(16) A fluoresceinated lineage tracer was injected into individual blastomeres of eight-cell sea urchin (Strongylocentrotus purpuratus) embryos, and the location of the progeny of each blastomere was determined in the fully developed pluteus.
(17) Although blastocysts were well expanded, distinct signs of injury to the blastomeres were present, proceeding from loss of complete blastomeres to structural changes such as large lamellar structures, dilation of smooth endoplasmic reticulum and Golgi complexes, and clumping of mitochondria.
(18) The activity of HPRT, but not of APRT, was readily detectable in single 4-cell and 8-cell blastomeres.
(19) The nucleus-like structure was partitioned into blastomeres during cleavage through a process of nuclear fission, and was maintained in a group of extraordinarily large blastomeres until the blastula stage.
(20) To distinguish between these possibilities, we compared the fates of individual frog blastomeres between Li-treated embryos and normal embryos using lineage tracers.
Division
Definition:
(n.) The act or process of diving anything into parts, or the state of being so divided; separation.
(n.) That which divides or keeps apart; a partition.
(n.) The portion separated by the divining of a mass or body; a distinct segment or section.
(n.) Disunion; difference in opinion or feeling; discord; variance; alienation.
(n.) Difference of condition; state of distinction; distinction; contrast.
(n.) Separation of the members of a deliberative body, esp. of the Houses of Parliament, to ascertain the vote.
(n.) The process of finding how many times one number or quantity is contained in another; the reverse of multiplication; also, the rule by which the operation is performed.
(n.) The separation of a genus into its constituent species.
(n.) Two or more brigades under the command of a general officer.
(n.) Two companies of infantry maneuvering as one subdivision of a battalion.
(n.) One of the larger districts into which a country is divided for administering military affairs.
(n.) One of the groups into which a fleet is divided.
(n.) A course of notes so running into each other as to form one series or chain, to be sung in one breath to one syllable.
(n.) The distribution of a discourse into parts; a part so distinguished.
(n.) A grade or rank in classification; a portion of a tribe or of a class; or, in some recent authorities, equivalent to a subkingdom.
Example Sentences:
(1) Here we report that sperm from psr males fertilizes eggs, but that the paternal chromosomes are subsequently condensed into a chromatin mass before the first mitotic division of the egg and do not participate in further divisions.
(2) Apparently, the irradiation with visible light of a low intensity creates an additional proton gradient and thus stimulates a new replication and division cycle in the population of cells whose membranes do not have delta pH necessary for the initiation of these processes.
(3) Chapter one Announcement of the Islamic Caliphate The announcement of the renewal of the caliphate in Iraq in the year 1427AH [2006] was the arbiter between division and separation as well as the glory of the Muslims.
(4) Models able to describe the events of cellular growth and division and the dynamics of cell populations are useful for the understanding of functional control mechanisms and for the theoretical support for automated analysis of flow cytometric data and of cell volume distributions.
(5) Further study both of the signaling events that lead to MPF activation and of the substrates for phosphorylation by MPF should lead to a comprehensive understanding of the biochemistry of cell division.
(6) Whereas the growth and division of normal cells is carefully regulated to meet the needs of the body, tumor cells proliferate autonomously and continually, eventually interfering with and destroying the functions of normal tissue.
(7) Tuberclebacilli did not stimulate macrophage division.
(8) But on June 29, 2011, Lois G Lerner, who heads the IRS division that oversees tax-exempt organizations, learned at a meeting that groups were being targeted, according to the watchdog's report.
(9) Cause-specific mortality comparisons were also made among the employment subgroups and by duration of employment in the company division using an internal analysis method.
(10) Postoperative examination revealed division of accessory pathway and no regurgitation of mitral prosthesis.
(11) The Disability Division of ActionAid-India supports 38 non-governmental organisations involved in disability programmes in India.
(12) This column is located ventral and lateral to the dorsolateral division of the trigeminal motor nucleus, and just medial to the descending trigeminal nerve rootlets.
(13) The retail and wholesale divisions powered the improved profits.
(14) From these results we concluded that the mutants have some defect in cell division after low doses of UV irradiation, similar to the lon(-) or fil(+) mutant of E. coli.
(15) The cellular groups of the medial zone together with the tuberomammillary nucleus groups of the medial zone together with the tuberomammillary nucleus (TUMM) are positioned at the interface between the lateral and the medial hypothalamus, and form an array of cellular groups indicated in our study as the intermediate division of the hypothalamus.
(16) In the meantime, the proliferation of salmonellae appeared to occur extracellularly in the peritoneal cavity as evidenced by their division.
(17) Hybrids obtained following fusion of normal human diploid fibroblasts with different immortal human cell lines exhibited limited division potential.
(18) An expanded version of this paper, containing full experimental details of the semisynthesis and characterization of [GlyA1-3H]insulin, has been deposited as Supplementary Publication SUP 50129 (30 pages) at the British Library (Lending Division), Boston Spa, Wetherby, West Yorkshire LS23 7BQ, U.K., from whom copies can be obtained on the terms indicated in Biochem.
(19) Anti-IgM antibodies also induced DNA synthesis of PBL-B, but their ability to induce cell division was less than that of anti-IgD antibodies even when used in combination with IL-4.
(20) The Tea Party movement has turned climate denial into a litmus test of conservative credentials – and that has made climate change one of the most sharp divisions between Obama and Romney.