| 词汇 | oocyte |
| 释义 | oocyte noun[ C ] biology specializeduk /ˈəʊ.ə.saɪt/ us /ˈoʊ.oʊ.saɪt/ a cell in an ovary(= organs that produce eggs) which may form an ovum(= an egg cell): An in vitro experiment was conducted with fertilized mouse oocytes. There are guidelines on the experimental use of human sperm, oocytes, and embryos. Five to seven oocytes or embryos for each category were evaluated. In both species, small primary oocytes were unable to fuse with spermatozoa. During the maturation process oocytes undergo a reorganization of the ultrastructure. Obstetrics: processes & stages connected with sexual reproduction amniotic andropause anovulatory come on hot flush inseminate luteal matrescence menopausal menopause menses menstrual menstrual cycle menstruate ovulation puberty sexual intercourse sexual reproduction someone's biological clock is ticking idiom the change (of life)idiom Examples of oocyteoocyte In the latter the germinative zone led into a region in which all oocyte nuclei were at interphase. The protein elements may be derived from reticulate granules and chitin from the glycogen reserves of the oocyte. You take these and get them back to the beginning of their life by nuclear transfer into an oocyte to produce a new embryo. However, a nucleus on its own cannot be regarded as an oocyte. The problem is that no test has accounted for the quality of the oocyte whose genetic make-up is paramount to reproductive outcome. Whether these aneuploid oocytes are eliminated by atresia, or reach preovulatory stages, remains unknown. If they deteriorate, the replacement of mature oocytes, and consequently fertility, decreases or comes to an end. The somatic cells were cultured under the same temperature and gas phase as the oocytes. No nuclear structure was found in these oocytes. Similar results were obtained in our experiment when round spermatids derived from frozen mature testicular tissue were injected into oocytes. These cells were able to complete their second meiotic division within the oocyte cytoplasm. In rabbit oocytes they are not seen until the fully developed pronuclei migrate to the oocyte centre. A 5-10% collection of immature oocytes is usually observed. Morphologically normal spindle was formed in these oocytes, indicating that the cell cycle arrest is not due to the failure of spindle organization. The cell cycles of oocytes and early embryos are different from those of somatic cells. 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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