| 词汇 | blastula |
| 释义 | blastula noun[ C ] biology specializeduk /ˈblæs.tʃə.lə/ us /ˈblæs.tʃə.lə/pluralblastulas or blastulaeuk /ˈblæs.tʃə.liː/ the early stage of development of an animal, consisting of a layer of cells around a hollow space: 囊胚 In animals, cleavage results in the formation of a blastula.在动物体内，卵裂会形成囊胚。 Blastulae were prepared by incubation of the fertilized eggs at room temperature for 6-10 hours. Related words blastocyst blastocoel The blastula gives no visible indication of the complex animal into which it will develop. Ovine eggs and blastulas look very like bovine ones in morphology and pigmentation. This simple structure, the blastula, must now be moulded by cellular activities into all the shapes that emerge during development. Animal reproduction androgen anti-oestrogen asexuality asexually barrenness calve fertile impregnate oestrogen ovulate panmictic panmixia procreate procreation procreative propagation rut semen spawn sterile You can also find related words, phrases, and synonyms in the topics: Cells Examples of blastulablastula In this study, the relationship between intact septate junctions and the ability of the sea urchin blastula epithelium to function as an occluding barrier was examined. The first three to four months are spent with the blastula in suspended development before it implants itself in the placenta. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A common feature of a vertebrate blastula is that it consists of a layer of blastomeres, known as the blastoderm, which surrounds the blastocoele. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This leads to the specification of non-neural ectoderm and later in the blastula stage to anmioserosa. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Invagination of the blastula occurs when the endoderm loses its affinity towards hyalin, while the ectoderm retains it. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. All animals develop from a blastula: consequences of an undervalued definition for thinking on development. The mature blastula epithelium is impermeable to macromolecules; however, brief depletion of divalent cations renders the epithelium permeable. At the morula and blastula stages, a group of micromeres at the animal pole showed immunoreactivity. The young blastula-like stages developed into tubular forms with inner and outer cell layers forming the body wall. The architectural features of the blastula epithelium responsible for these permeability characteristics are not known. Tight junctions regulate the barrier to paracellular permeability in chordate epithelia; however, the sea urchin blastula epithelium lacks tight junctions and instead possesses septate junctions. Ganglioside synthesis began at the blastula stage (stage 8) and increased gradually, reaching a maximum during gastrulation (stages 10-12). Ganglioside synthesis began at the blastula stage and reached a maximum during gastrulation (stages 10-12). Middle blastula stage was selected for actin filament densitometry comparison (as 1) and compared with other embryo stages. Blastula preparation by in vitro production systems displays great advantages, particularly for solving litter size and season limitation in large livestock. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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