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Vitellogenesis is the process of yolk protein formation in the oocytes during sexual maturation. [2] The term vitellogenesis comes from the Latin vitellus ("egg yolk"). Yolk proteins, such as Lipovitellin and Phosvitin , provides maturing oocytes with the metabolic energy required for development.
Vitellogenin provides the major egg yolk protein that is a source of nutrients during early development of egg-laying vertebrates and invertebrates.Although vitellogenin also carries some lipid for deposition in the yolk, the primary mechanism for deposition of yolk lipid is instead via VLDLs, at least in birds and reptiles. [4]
A weak and watery white permits the yolk to approach the shell closely, thus causing the yolk outline to appear plainly visible and dark when the egg is twirled. With respect to a broken-out egg, a weak and watery white has a Haugh unit value lower than 60 when measured at a temperature between 45 o {\displaystyle ^{o}} F and 60 o ...
The embryo forms a disc of cells, called a blasto-disc, on top of the yolk. Discoidal cleavage is commonly found in monotremes, birds, reptiles, and fish that have telolecithal egg cells (egg cells with the yolk concentrated at one end). The layer of cells that have incompletely divided and are in contact with the yolk are called the "syncytial ...
Vitellin is a protein found in the egg yolk. It is a phosphoprotein. [1] Vitellin is a generic name for major of many yolk proteins. [2] Vitellin has been known since the 1900s. [3] The periodic acid-Schiff method and Sudan black B dye was used to help determine that Vitellin is a glycolipoprotein because it stained positive when tested.
Mesolecithal eggs have comparatively more yolk than the microlecithal eggs. The yolk is concentrated in one part of the egg (the vegetal pole), with the cell nucleus and most of the cytoplasm in the other (the animal pole). The cell cleavage is uneven, and mainly concentrated in the cytoplasma-rich animal pole. [3]
Only 177 days stand between us and this year's Summer Olympics in London. As an official Olympic sponsor, Cadbury Creme Egg has taken a head start in promoting itself with a Facebook game launch ...
The yolk of a chicken egg Diagram of a fish egg; the yolk is the area which is marked 'C'. Among animals which produce eggs, the yolk (/ ˈ j oʊ k /; also known as the vitellus) is the nutrient-bearing portion of the egg whose primary function is to supply food for the development of the embryo.