Dictionary » E » Eggshell



1. The shell or exterior covering of an egg. Also used figuratively for anything resembling an eggshell.

2. (Science: zoology) a smooth, white, marine, gastropod shell of the genus ovulum, resembling an egg in form. The exterior covering of a birds egg.

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Re: Unidirectional ORI, Onion-Skin-Model

... So it has to lie either at the right or the left of the amplification bubbles... "Unlike the amphibian rRNA genes in Example 13.16, the eggshell genes of Drosophila can be amplified without extra chromosomal replication. A large number of follicle cells surround the egg and produce the ...

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by Rost
Thu Aug 30, 2012 6:52 am
Forum: Genetics
Topic: Unidirectional ORI, Onion-Skin-Model
Replies: 4
Views: 8301

Avian and ratite medullary bone

Bird medullary bone is described as a secondary bone tissue that provided calcium for producing eggshell, and have no biomechanical function. Bird medullary tissue is a very brittle and fragile type of bone that the spicules of medullary bone easily separated from the originating ...

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by munyit
Mon Apr 02, 2012 4:43 am
Forum: Physiology
Topic: Avian and ratite medullary bone
Replies: 0
Views: 2071

Re: Diet Of Laying Birds

... where the mentioned foodstuffs is too hard for the bird to crush, it can be ground into mesh and served to the bird. Calcium is needed in forming eggshell for the bird. If the bird suffers from calcium deficiency that will lead to a situation where the bird will rob the needed calcium from it ...

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by chikis
Thu Feb 23, 2012 2:58 pm
Forum: Zoology Discussion
Topic: Diet Of Laying Birds
Replies: 13
Views: 8459

Origin Of Male/Female Gender

... one another. The nucleus and cytoplasm are completely enclosed in a plasma membrane later, just prior to fertilization. After fertilization, the eggshell is added. Fertilization takes place as maturing oocytes are squeezed through the spermatheca. Eggs develop in the hermaphrodite body briefly ...

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by GaryGaulin
Sat Jan 09, 2010 7:56 am
Forum: Evolution
Topic: Origin Of Male/Female Gender
Replies: 1
Views: 10868

What came first, the Chicken or the Egg?

... of the chicken had to have evolved into the "true chicken" as a zygote/embryo, NOT as an adult. so, because the organism inside the eggshell does NOT change when it hatches, the first real chicken had to have been in an egg.

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by jimmystang
Mon Jan 01, 2007 5:03 pm
Forum: Physiology
Topic: What came first, the Chicken or the Egg?
Replies: 51
Views: 43334

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