(n.) The germinal membrane in an ovum, from which the embryo is developed.
Example Sentences:
(1) Laminin is a constituent of the basement membrane in both chicken and quail blastoderms.
(2) The blastoderm stage of Drosophila embryogenesis is a time of crucial transitions in RNA transcription, the cell cycle and segment determination.
(3) Their posterior domains of expression at blastoderm stage are under the control of the maternal pattern organizer gene nanos.
(4) This expansion involves the migration over the inner surface of the vitelline membrane of a specialized band of 'edge cells' at the blastoderm periphery.
(5) Three sets of muscles separated by lineage restrictions are observed, even when cells are marked as early as the blastoderm stage.
(6) (1) Removal of both the area opaca and the marginal zone of the area pellucida from a blastoderm stripped of its hypoblast (type-IV operation) prevents the regeneration of a normally functioning primary hypoblast.
(7) The latter covers the blastoderm anlages which are involved in the development of abdomen, and the genital imaginal disc.
(8) Three experiments were conducted to determine the temperature required to initiate blastoderm development of Bobwhite quail eggs.
(9) Laminin immunogold labeling was not detected in the blastoderm at stage X.
(10) The tissues were examined using fluorescent antibody procedures and the earliest detection from positive tissues were: day 6, blastoderm (10%); day 8, sinus (44%) and peritoneum (55%); day 19, lung (11%) and trachea (44%); day 23, air sacs (62%).
(11) Microtubule distribution was examined in whole mounts of Drosophila embryos from the cellularization of the syncytial blastoderm (stage 6) to the completion of the gastrulation (stage 7) by fluorescence microscopy.
(12) We propose that postcellular blastoderm su(wa) expression is repressed by preventing splices necessary to produce a functional mRNA.
(13) These results indicate that both microtubules and microfilaments may be involved in determining centrosome shape during the syncytial mitoses which lead to the formation of the blastoderm in early Drosophila embryos.
(14) Chick blastoderms, incubated for 5 hrs., were wholly irradiated with ultraviolet light (2 537 A).
(15) These include transfection of avian sperm, development of germ line chimeras using primordial germ cells and blastodermal cells, and the development of embryonic stem cell lines.
(16) By 48 h of incubation all cells of the chick blastoderm seem to have lost the capacity to form colonies in agarose.
(17) Hence, the development of isolated blastoderms depends on the content of K+ in the medium and this dependence reduces with the age.
(18) They are also described for the subsequent mitoses of the syncytial blastoderm where the cortex and its well-developed cytoskeleton is reorganized into cell-like surface protrusions known as 'caps' or 'buds'.
(19) Cold treatment of embryos during the cellularization of the blastoderm results in marked fragmentation of the centrosomes, but nucleating capacity is preserved.
(20) Death in the unhatched eggs occurred prior to blastoderm formation indicating BM caused chromosome breakage.
Delamination
Definition:
(n.) Formation and separation of laminae or layers; one of the methods by which the various blastodermic layers of the ovum are differentiated.
Example Sentences:
(1) Dissecting aneurysms--which should be called incomplete internal aortic disease with delamination of the media--remains a fearsome disease in subjects over 50, despite advances in surgery.
(2) Pathologic examination revealed a damaged luminal surface in 22 grafts, deep folds in 8 grafts and delamination of the graft wall in 16 cases.
(3) Orthopedic surgeons should be aware of early delamination and surface failure in heat-pressed inserts.
(4) Water absorption and subsequent delamination made the plate flexible.
(5) These insights give us several ideas about possible therapeutic interventions: corticosteroids or other drugs might be used to blunt granulocyte responsiveness; iron chelation might be used to limit the production of toxic hydroxyl radical; competitive inhibition of oxidant damage might be possible using such simple compounds as methionine; protease inhibitors might blunt endothelial cell delamination.
(6) Meso1 is a molecule of 380 kDa that is first detected at the time of primary mesenchyme cell delamination from the wall of the blastula.
(7) No delamination was found for either system after vigorous washing with water.
(8) Localization of the transcript and protein in embryos has shown that the gene is predominantly expressed in a restricted set of tissues: the developing tracheal system and the delaminating midline glial and neural cells.
(9) Delamination, consisting of complete breakup of material in flakes and particles, appeared to be initiated by intergranular material defects and propagated by the excessive subsurface stresses beneath the contact zone.
(10) In embryos lacking any one of five genes, the restriction of ac expression to single cells does not occur; instead, all cells of each cluster continue to express ac, enlarge, delaminate and become neuroblasts.
(11) Results indicated that these dentinal bonding agents actually bonded to the smear layer, and samples demonstrated delamination of the smear layer from underlying dentin following thermocycling.
(12) The polyethylene of PCA tibial components showed serious delamination after only short durations, as a result of heat pressing.
(13) As the neural folds elevate, the NE and EE delaminate progressively beginning at the basal surface of the lateral extremes of the neural plate.
(14) The photophores differentiate as an outgrowth of the basal cell layer of the epidermis, from which they delaminate into the dermis.
(15) The polyethylene of the tibial components showed excessive delamination.
(16) Gross morphologic examination, light microscopy, and scanning electron microscopy demonstrated that the umbilical vein grafts appeared to be fragile and easily delaminated.
(17) The mitotic recombination experiment revealed that Notch product is required by epidermal cells subsequent to neuroblast delamination.
(18) At somitic levels, where the convergence is not important, delamination involves the progressive formation of a half-moon-shaped cavity.
(19) Abrasion from cement or bone and delamination wear were particularly pronounced in the knee.
(20) This ultimately resulted in disruption of the lamina, dispersal of the basal layer of the epithelium, and release of the crest precursors in the delaminate gap.