pellucida

In IVF, the outer membrane of the egg the zona pellucida is an efficient barrier in preventing the penetration of sperm that have DNA damage.

A Baby at Last! Mark L. Fuerst 2010

Species: Teuthowenia pellucida; common name: googly-eyed glass squid, size: 20 cm.

The wonderful world of cephalopods frankwu 2007

Also inhabiting Ecoregion 61c are several species that are threatened in Pennsylvania, including the eastern sand darter (Ammocrypta pellucida) and the northern brook lamprey (Ichthyomyzon fossor) (Cooper, 1985, pp. 179, 182).

Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA) 2008

As a result, the eastern sand darter (Ammocrypta pellucida) was extirpated from the Ohio River drainage of Pennsylvania (Cooper, 1983, p. 189) and the obscure clubtail dragonfly (Progomphus obscurus) disappeared from the Allegheny River system (Opler, 1985, p. 138).

Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA) 2008

It's sometimes said that the fastest sperm gets to fertilize the egg, but in fact, it takes a mass of sperm, containing enzymes that break down what is called the "zona pellucida" to allow a single sperm to get through.

Chaos James Killus 2008

Still, Zonagen Pharmaceuticals is working on a vaccine to make the zona pellucida, the outer layer of the egg, impenetrable to sperm, and another vaccine against human chorionic gonadotropin, a hormone integral to pregnancy.

Options Beyond The Pill 2008

It's sometimes said that the fastest sperm gets to fertilize the egg, but in fact, it takes a mass of sperm, containing enzymes that break down what is called the "zona pellucida" to allow a single sperm to get through.

Archive 2008-05-01 James Killus 2008

As it slowly travels the length of the tube it continues to divide but still remains cloistered within the zona pellucida, the hard outer covering or “shell” of your original egg.

Getting Pregnant Niels H. Lauersen 2000

Additionally, nicotine in the bloodstream at the time when your eggs are developing can adversely affect the zona pellucida, the hard outside covering of your egg.

Getting Pregnant Niels H. Lauersen 2000

They weren't as important as the ilex; Rosa pellucida would produce no miracle cures, but in a hundred years its distinctive flowers would open in no mortal garden.

In the Garden of Iden 1997