zona pellucida
zona pellucida The transparent covering of an
oocyte.
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 "USA Today (Magazine)")
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New procedure yields promising results. (micromanipulation is a new option for couples struggling with infertility)(Brief Article)
Magazine article from: USA Today (Magazine); 10/1/1996; 318 words
; ...weak-to-immobile sperm. There also are cases in which a woman produces eggs that have an abnormally strong coating, known as the zona pellucida, which is too tough for even normal sperm to penetrate. In these cases, we can use micromanipulation to allow regular fertilization...
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Freezing Eggs of Cancer Patients.(Brief Article)
Magazine article from: USA Today (Magazine); 2/1/2001; 576 words
; ...Technologies laboratories. But they fertilize reasonably well with ICSI. That is because the freezing process damages the zona pellucida, the outer shell of the egg, to which the sperm normally must bind before penetrating the egg. With ICSI, the damaged shell...
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Engineering stem cell fate.(Tissue Engineering)
Magazine article from: Science & Medicine; 2/1/2005; ; 700+ words
; ...transplantation, produced for research purposes. In the first approach, embryos are thawed and cultured to the blastocyst stage. The zona pellucida is chemically removed, and the inner cell mass is isolated by immunosurgery and cultured in vitro. The second approach provides...
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The creating hand of God: 'fearfully, wonderfully made'.(FEATURE ARTICLE)(on the beginning of human life in scientific and religious aspects)(Essay)
Magazine article from: Catholic Insight; 2/1/2009; ; 700+ words
; ...membrane and allows enough time [5 minutes] for the organism to release calcium ions that harden the thick outer membrane, the zona pellucida that surrounds it. This prevents any other sperm from adhering to or penetrating the zona. The tiny human being secretes...
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The treatment of male subfertility with acupuncture.
Magazine article from: The Journal of Chinese Medicine; 10/1/2008; ; 700+ words
; ...progesterone and glycoprotein ZP3 appear to assist sperm activation and penetration of the cumulus (outer layer of the egg) and zona pellucida (inner layer) respectively. It should be noted also that whatever form of assisted reproduction is used (intrauterine, in-vit...
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Why do we have such a thin layer of skin on our eyes?(Ask Dr. Cory)
Magazine article from: U.S. Kids; 4/1/1996; ; 122 words
; Dear Sarah: The coverings on your eyes are thin so you can see properly. The see-through, or transparent, covering over the center of your eye is called the cornea (CORE-nee-a). It helps focus light rays onto the back of your eye. If this layer...
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Eye inflammation in livestock can be caused by burrs.(Livestock health)
Magazine article from: Countryside & Small Stock Journal; 1/1/2008; ; 700+ words
; ...tears wash them out. Occasionally they are trapped under the eyelid and cause irritation and scraping of the cornea--the transparent covering of the eye. Any large foreign particles can usually be seen and flushed flee or removed. By contrast, tiny burr slivers...
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zona pellucida
Book article from: A Dictionary of Biology
zona pellucida A layer of glycoprotein that surrounds the plasma membrane of a mammalian egg cell. It develops as a jelly coat around the primary oocyte and is surrounded by the granulosa cells .
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Prenatal Development
Encyclopedia entry from: Gale Encyclopedia of Children's Health: Infancy through Adolescence
...membrane of the egg called the zona pellucida. When one sperm successfully binds with the zona pellucida, a series of chemical reactions...morula, still enclosed by the zona pellucida; three days after fertilization...
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egg membrane
Book article from: A Dictionary of Biology
...called the vitelline membrane in insects, molluscs, birds, and amphibians, the chorion in tunicates and fish, and the zona pellucida in mammals. Insects have a second thicker membrane, also called the chorion. Secondary membranes are secreted by the...
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Fertilization
Book article from: Genetics
...cumulus cells, and the inner layer, the zona pellucida, is comprised of a jellylike coating made...enzymes necessary to break through the zona pellucida. Upon reaching the surface of the zona pellucida, the sperm releases enzymes to break through...
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ova
Book article from: The Oxford Companion to the Body
...oocyte and the polar body contain an X-sex chromosome. The secondary oocyte and the polar body remain surrounded by the zona pellucida and the cumulus oophorus. Almost immediately after this event the secondary oocyte begins its second meiotic division...
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