Pellucida sentence example
pellucida
- Most important are the fine structures of diatoms such as Surirella gemma and Amphipleura pellucida or artificial fine divisions as in a Nobert's grating.
- Norbert's test plates, which bear graduated groups of extremely fine and narrow divisions are very useful, while the tests of Amphipleura pellucida and Surirella gemma are often employed.
- The egg is surrounded by a special coat called the zona pellucida.
- E. aegyptiaca, with silvery-white plumes, maxima, elegans, pilosa, amabilis, pellucida, capillaris, plumose, are all elegant annuals.
- For fertilization to occur, a sperm must penetrate the tough outer membrane of the egg called the zona pellucida.Advertisement
- When one sperm successfully binds with the zona pellucida, a series of chemical reactions occurs to allow only that sperm to penetrate.
- About sixty hours after fertilization, approximately sixteen cells have formed to what is called a morula, still enclosed by the zona pellucida; three days after fertilization, the morula enters the uterus.
- The zona pellucida disappears and the morula becomes a blastocyst.