Information om | Engelska ordet BLASTULA

Exempel på hur man kan använda BLASTULA i en mening

• In mammalian development, the blastula develops into the blastocyst with a differentiated inner cell mass and an outer trophectoderm.
• Gastrulation is the stage in the early embryonic development of most animals, during which the blastula (a single-layered hollow sphere of cells), or in mammals the blastocyst, is reorganized into a two-layered or three-layered embryo known as the gastrula.
• Invagination is the morphogenetic processes by which an embryo takes form, and is the initial step of gastrulation, the massive reorganization of the embryo from a simple spherical ball of cells, the blastula, into a multi-layered organism, with differentiated germ layers: endoderm, mesoderm, and ectoderm.
• In biology, a blastomere is a type of cell produced by cell division (cleavage) of the zygote after fertilization; blastomeres are an essential part of blastula formation, and blastocyst formation in mammals.
• At this stage in mammals the blastula is called the blastocyst, which consists of an outer epithelium, the trophectoderm, enveloping the inner cell mass and the blastocoel.
• Germ cells are set aside in the embryo at the blastula stage, and are incorporated into the gonads during organogenesis.
• Diploblasty is a condition of the blastula in which there are two primary germ layers: the ectoderm and endoderm.
• It is a patch of large endodermal cells which remains exposed on the vegetal surface of the blastula that will eventually be internalized by epiboly.
• Zinc, then, causes an animalizing effect since the binding of the blastula cells would be stronger, while the weaker attachment of the cells would form the vegetal half.
• In amniote embryonic development, the epiblast (also known as the primitive ectoderm) is one of two distinct cell layers arising from the inner cell mass in the mammalian blastocyst, or from the blastula in reptiles and birds, the other layer is the hypoblast.
• A blastoderm (germinal disc, blastodisc) is a single layer of embryonic epithelial tissue that makes up the blastula.
• Epiboly in zebrafish is the first coordinated cell movement, beginning at the dome stage late in the blastula period and continuing throughout gastrulation.
• For the molecular mechanism of β-catenin and the micromeres, it was observed that Notch was present uniformly on the apical surface of the early blastula but was lost in the secondary mesenchyme cells (SMCs) during late blastula and enriched in the presumptive endodermal cells in late blastula.
• In developmental biology, midblastula or midblastula transition (MBT) occurs during the blastula stage of embryonic development in non-mammals.
• As for many animals, the egg cell of any extant ambulacrarian divides and develops into a blastula ("cell ball"), which develops into a triploblast ("three-layered") gastrula.
• Importantly, unshelled embryos (blastula, gastrula and trochophore stages) were not found in snails >16 mm and the numbers of shelled embryos themselves decreased in the largest snails, >24 mm.
• The blastula and gastrula phase in Siphonarioidea occurs for only a 1-2 day period, after which a yolk-like trochophore forms within 2–3 days.
• Vegetal structures form late blastula masses that normally would give rise to endoderm and mesoderm, when injected with FoxI1e mRNA, they are able to express ectodermal specific markers (pan-ectodermal E-cadherin, epithelial cytokeratin, neural crest marker Slug and neural marker Sox-2) while endodermal markers (endodermin, Xsox17a) decreased in expression.
• Demethylation in early embryogenesis occurs in the preimplantation period in two stages – initially in the zygote, then during the first few embryonic replication cycles of morula and blastula.

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